<?php
namespace app\common\utils\approval\service;

use app\common\service\MessageNotificationsService;
use support\exception\BusinessException;
use support\Db;

class ApprovalFlowService
{
    /** 启动审批流程 */
    public function start(string $flowType, string $bizType, string $bizId, array $formData, int $initiatorId): array
    {
        return Db::transaction(function () use ($flowType, $bizType, $bizId, $formData, $initiatorId) {
            $flow = Db::table('approval_flows')->where('type', $flowType)->where('is_active', 1)->first();
            if (!$flow) throw new BusinessException("审批流程未找到或已停用: {$flowType}");

            $steps = json_decode($flow->steps, true);
            if (!is_array($steps) || empty($steps)) throw new BusinessException("流程步骤配置错误");

            // 找首个有效步骤索引（考虑条件）
            $firstIndex = $this->getNextStepIndex($steps, $formData, -1);
            if ($firstIndex === null) throw new BusinessException("未找到可执行的审批步骤");
            $firstStep = $steps[$firstIndex];

            $now = date('Y-m-d H:i:s');
            $deadlineAt = null;
            if (($flow->timeout_hours ?? 0) > 0) {
                $deadlineAt = date('Y-m-d H:i:s', time() + $flow->timeout_hours * 3600);
            }

            $instanceId = Db::table('approval_instances')->insertGetId([
                'flow_type'    => $flowType,
                'biz_type'     => $bizType,
                'biz_id'       => $bizId,
                'form_data'    => json_encode($formData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
                'initiator_id' => $initiatorId,
                'status'       => 'processing',
                'current_step' => $firstIndex,
                'deadline_at'  => $deadlineAt,
                'created_at'   => $now,
                'updated_at'   => $now,
            ]);

            $instance = (object)[
                'id'           => $instanceId,
                'flow_type'    => $flowType,
                'form_data'    => json_encode($formData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
                'initiator_id' => $initiatorId,
                'current_step' => $firstIndex,
                'status'       => 'processing',
            ];

            // 解析首步审批人（支持 role_id 或 roles.name）
            $approverIds = $this->resolveApprovers($firstStep, $instance, true);
            foreach ($approverIds as $uid) {
                $this->insertApprovalRecord($instanceId, $firstIndex, $uid);
            }

            $this->sendNotification($approverIds, $instance, 'pending', false);
            $this->notifyCCs($firstStep, $instance, 'pending');

            return ['instance_id' => $instanceId];
        });
    }

    /** 执行审批（幂等友好） */
    public function approve(int $instanceId, int $approverId, string $action, string $comment = '')
    {
        if (!in_array($action, ['approve','reject'], true)) {
            throw new BusinessException("无效的审批操作");
        }

        return Db::transaction(function () use ($instanceId, $approverId, $action, $comment) {
            $instance = Db::table('approval_instances')->where('id', $instanceId)->lockForUpdate()->first();
            if (!$instance) throw new BusinessException("审批实例未找到");
            if ($instance->status !== 'processing') {
                // return ['status' => 'noop', 'reason' => 'instance_not_processing', 'instance_status' => $instance->status];
                // throw new BusinessException("实例未处理");
                return ['status' => 'noop', 'msg' => '实例未处理'];
            }

            $flow  = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
            if (!$flow) throw new BusinessException("审批流程定义未找到");

            $steps = json_decode($flow->steps, true);
            $idx   = (int)$instance->current_step;
            $step  = $steps[$idx] ?? null;
            if (!$step) throw new BusinessException("当前步骤配置错误");

            // 找到该用户在本步的 pending 记录（加锁）
            $pendingRecord = Db::table('approval_records')
                ->where('instance_id', $instanceId)
                ->where('approver_id', $approverId)
                ->where('step_index', $idx)
                ->where('status', 'pending')
                ->lockForUpdate()
                ->first();

            if (!$pendingRecord) {
                // 已处理过？
                $anyRecord = Db::table('approval_records')
                    ->where('instance_id', $instanceId)
                    ->where('approver_id', $approverId)
                    ->where('step_index', $idx)
                    ->first();
                if ($anyRecord && $anyRecord->status !== 'pending') {
                    // return ['status' => 'noop', 'reason' => 'already_handled', 'record_status' => $anyRecord->status];
                    // throw new BusinessException("已处理");
                    return ['status' => 'noop', 'msg' => '已处理'];
                }
                // 步骤已推进
                if ((int)$instance->current_step !== $idx) {
                    // return ['status' => 'noop', 'reason' => 'not_current_step', 'current_step' => (int)$instance->current_step];
                    // throw new BusinessException("非当前步骤");
                    return ['status' => 'noop', 'msg' => '非当前步骤'];
                }
                // return ['status' => 'noop', 'reason' => 'no_pending_record'];
                return ['status' => 'noop', 'msg' => '无待处理记录'];
            }

            $now = date('Y-m-d H:i:s');

            // 1) 更新当前人的审批记录
            Db::table('approval_records')->where('id', $pendingRecord->id)->update([
                'action'      => $action,
                'status'      => ($action === 'approve') ? 'approved' : 'rejected',
                'comment'     => $comment,
                'approved_at' => $now,
                'updated_at'  => $now,
            ]);

            // 2) 聚合本步结论（any / all）
            $typeRaw = strtolower($step['type'] ?? 'all');
            $type    = in_array($typeRaw, ['any','all']) ? $typeRaw : 'all';
            $outcome = $this->getStepOutcome($instanceId, $idx, $type); // 'pending' | 'approve' | 'reject'

            if ($outcome === 'pending') {
                // return ['status' => 'step_pending'];
                return ['status' => 'step_pending', 'msg' => '步骤待定'];
            }

            // 3) 有结论：关闭本步其余 pending
            $this->closeOtherPending($instanceId, $idx, [$approverId]);

            // 4) 拒绝 => 结束
            if ($outcome === 'reject') {
                Db::table('approval_instances')->where('id', $instanceId)->update([
                    'status'      => 'rejected',
                    'finished_at' => $now,
                    'updated_at'  => $now,
                ]);
                $this->sendNotification([$instance->initiator_id], $instance, 'reject', false);
                // return ['status' => 'completed', 'result' => 'reject'];
                return ['status' => 'completed', 'msg' => '已拒绝'];
            }

            // 5) 通过 => 进入下一步或结束
            $formData  = json_decode($instance->form_data, true) ?: [];
            $nextIndex = $this->getNextStepIndex($steps, $formData, $idx);

            if ($nextIndex === null) {
                Db::table('approval_instances')->where('id', $instanceId)->update([
                    'status'      => 'approved',
                    'finished_at' => $now,
                    'updated_at'  => $now,
                ]);
                $this->sendNotification([$instance->initiator_id], $instance, 'approve', false);
                // return ['status' => 'completed', 'result' => 'approve'];
                return ['status' => 'completed', 'msg' => '已同意'];
            }

            // 乐观推进 current_step
            $affected = Db::table('approval_instances')
                ->where('id', $instanceId)
                ->where('current_step', $idx)
                ->where('status', 'processing')
                ->update(['current_step' => $nextIndex, 'updated_at' => $now]);
            if (!$affected) {
                // return ['status' => 'noop', 'reason' => 'concurrent_progressed'];
                return ['status' => 'noop', 'msg' => '并发进展'];
            }

            // 生成下一步待办 + 通知
            $nextStep = $steps[$nextIndex];
            $nextApprovers = $this->resolveApprovers($nextStep, $instance, true);
            foreach ($nextApprovers as $uid) {
                $this->insertApprovalRecord($instanceId, $nextIndex, $uid);
            }
            $this->sendNotification($nextApprovers, $instance, 'pending', false);
            $this->notifyCCs($nextStep, $instance, 'pending');

            // return ['status' => 'next_step', 'step_name' => $nextStep['name'] ?? ('Step '.$nextIndex)];
            return ['status' => 'next_step', 'msg' => '进行下一步：'.$nextStep['name'] ?? ('Step '.$nextIndex)];
        });
    }

    /** 撤回（仅发起人在无已处理记录前可撤回） */
    public function revoke(int $instanceId, int $initiatorId, string $reason = '')
    {
        return Db::transaction(function () use ($instanceId, $initiatorId, $reason) {
            $instance = Db::table('approval_instances')->where('id', $instanceId)->lockForUpdate()->first();
            if (!$instance) throw new BusinessException('审批实例未找到');
            if ((int)$instance->initiator_id !== (int)$initiatorId) throw new BusinessException('无权撤回');
            if ($instance->status !== 'processing') throw new BusinessException('流程已结束或不可撤回');

            $handled = Db::table('approval_records')
                ->where('instance_id', $instanceId)
                ->whereIn('status', ['approved','rejected','timeout','skipped'])
                ->count() > 0;
            if ($handled) throw new BusinessException('当前进度不可撤回');

            $now = date('Y-m-d H:i:s');
            Db::table('approval_instances')->where('id', $instanceId)->update([
                'status'      => 'revoked',
                'finished_at' => $now,
                'updated_at'  => $now,
            ]);

            Db::table('approval_records')
                ->where('instance_id', $instanceId)
                ->where('status', 'pending')
                ->update(['status' => 'skipped', 'approved_at' => $now, 'updated_at' => $now]);

            $this->sendNotification([$initiatorId], $instance, 'revoked', false);
            return ['status' => 'completed', 'result' => 'revoked'];
        });
    }

    /** 我的待办 */
    public function getPendingApprovals(int $userId): array
    {
        return Db::table('approval_records as ar')
            ->join('approval_instances as ai', 'ar.instance_id', '=', 'ai.id')
            ->where('ar.approver_id', $userId)
            ->where('ar.status', 'pending')
            ->where('ai.status', 'processing')
            ->select('ai.*')
            ->distinct()
            ->get()
            ->toArray();
    }

    /** 审批历史 */
    public function getApprovalHistory(int $instanceId): array
    {
        return Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->orderBy('step_index')
            ->orderByRaw('COALESCE(approved_at, created_at) asc')
            ->get()
            ->toArray();
    }

    /** 流程图数据（把 skipped/timeout 视作已完结的中性状态） */
    public function getFlowDiagramData(int $instanceId): array
    {
        $instance = Db::table('approval_instances')->find($instanceId);
        if (!$instance) return [];

        $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) return [];

        $steps = json_decode($flow->steps, true) ?: [];
        $records = Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->orderBy('step_index')->orderByRaw('COALESCE(approved_at, created_at) asc')
            ->get()
            ->groupBy('step_index');

        $formData = json_decode($instance->form_data, true) ?: [];
        $data = [];
        foreach ($steps as $i => $step) {
            $actions = ($records->get($i) ?? collect())->toArray();

            if (!empty($actions)) {
                $cntApproved = 0; $cntRejected = 0; $cntPending = 0;
                foreach ($actions as $a) {
                    if ($a->status === 'approved') $cntApproved++;
                    elseif ($a->status === 'rejected') $cntRejected++;
                    elseif ($a->status === 'pending')  $cntPending++;
                    // skipped/timeout 不阻断完结显示
                }
                if ($cntRejected > 0)      $status = 'rejected';
                elseif ($cntPending > 0)   $status = 'processing';
                elseif ($cntApproved > 0)  $status = 'approved';
                else                       $status = 'approved'; // 全是 skipped/timeout 也视为已过
            } else {
                if ($i < (int)$instance->current_step) {
                    if (isset($step['condition']) && !$this->evaluateCondition($step['condition'], $formData)) {
                        $status = 'skipped';
                    } else {
                        $status = 'approved';
                    }
                } elseif ($i === (int)$instance->current_step && $instance->status === 'processing') {
                    $status = 'processing';
                } else {
                    $status = 'pending';
                }
            }

            $data[] = [
                'index'   => $i,
                'name'    => $step['name'] ?? ('Step '.$i),
                'type'    => $step['type'] ?? 'all',
                'status'  => $status,
                'actions' => $actions,
            ];
        }
        return $data;
    }

    /** 定时任务：处理超时（实例级） */
    public function handleTimeouts()
    {
        $now = date('Y-m-d H:i:s');
        $expired = Db::table('approval_instances')
            ->where('status', 'processing')
            ->whereNotNull('deadline_at')
            ->where('deadline_at', '<=', $now)
            ->get();

        foreach ($expired as $instance) {
            Db::transaction(function () use ($instance, $now) {
                $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
                if (!$flow) return;

                $final = ($flow->timeout_action === 'auto_approve') ? 'approved' : 'rejected';
                $finalAction = ($flow->timeout_action === 'auto_approve') ? 'approve' : 'reject';

                Db::table('approval_instances')->where('id', $instance->id)->update([
                    'status'      => $final,
                    'finished_at' => $now,
                    'updated_at'  => $now,
                ]);

                Db::table('approval_records')
                    ->where('instance_id', $instance->id)
                    ->where('step_index', $instance->current_step)
                    ->where('status', 'pending')
                    ->update(['status' => 'timeout', 'approved_at' => $now, 'updated_at' => $now]);

                $this->notifyInitiator($instance, $finalAction);
            });
        }
    }

    // ---------- 内部工具 ----------

    /** 解析审批人（role/user/initiator_leader/field_user/dept_head） */
    private function resolveApprovers(array $step, object $instance, bool $avoidSelf = true): array
    {
        $resolved = [];
        $formData = json_decode($instance->form_data ?? '{}', true) ?: [];

        $confs = $step['approvers'] ?? [];
        foreach ($confs as $cfg) {
            $typ = $cfg['type'] ?? '';
            $val = $cfg['value'] ?? null;
            $ids = [];

            switch ($typ) {
                case 'role':
                    $sys = isset($cfg['system_id']) ? (int)$cfg['system_id'] : null;
                    $includeGlobal = array_key_exists('include_global', $cfg) ? (bool)$cfg['include_global'] : true;
                    $ids = $this->getUserIdsByRole($val, $sys, true, $includeGlobal);
                    break;
                case 'user':
                    $ids = [(int)$val];
                    break;
                case 'initiator_leader':
                    $leaderId = $this->getLeaderIdByUserId((int)$instance->initiator_id);
                    if ($leaderId) $ids = [(int)$leaderId];
                    break;
                case 'field_user':
                    if (isset($formData[$val])) $ids = [(int)$formData[$val]];
                    break;
                case 'dept_head':
                    $head = $this->getDeptHeadId((int)$val);
                    if ($head) $ids = [(int)$head];
                    break;
                default:
                    throw new BusinessException("不支持的审批人类型: {$typ}");
            }
            $resolved = array_merge($resolved, $ids);
        }

        $resolved = array_unique(array_filter(array_map('intval', $resolved)));
        if ($avoidSelf) {
            $resolved = array_values(array_filter($resolved, fn($id) => $id !== (int)$instance->initiator_id));
        }
        if (empty($resolved)) {
            throw new BusinessException("步骤未解析到任何审批人");
        }
        return $resolved;
    }

    /** 通知抄送人 */
    private function notifyCCs(array $step, object $instance, string $action = 'pending'): void
    {
        $ccConfig = $step['cc'] ?? [];
        if (empty($ccConfig)) return;

        $formData = json_decode($instance->form_data ?? '{}', true) ?: [];
        $uids = [];

        foreach ($ccConfig as $cc) {
            $typ = $cc['type'] ?? '';
            $val = $cc['value'] ?? null;

            switch ($typ) {
                case 'role':
                    $uids = array_merge($uids, $this->getUserIdsByRole($val, null, true, true));
                    break;
                case 'user': $uids[] = (int)$val; break;
                case 'initiator_leader':
                    $leaderId = $this->getLeaderIdByUserId((int)$instance->initiator_id);
                    if ($leaderId) $uids[] = (int)$leaderId;
                    break;
                case 'field_user':
                    if (isset($formData[$val])) $uids[] = (int)$formData[$val];
                    break;
                case 'dept_head':
                    $head = $this->getDeptHeadId((int)$val);
                    if ($head) $uids[] = (int)$head;
                    break;
                default: break;
            }
        }

        $uids = array_unique(array_filter(array_map('intval', $uids)));
        if (empty($uids)) return;

        $now = date('Y-m-d H:i:s');
        foreach ($uids as $uid) {
            $exists = Db::table('approval_ccs')
                ->where('instance_id', $instance->id)
                ->where('user_id', $uid)
                ->count() > 0;
            if (!$exists) {
                Db::table('approval_ccs')->insert([
                    'instance_id' => $instance->id,
                    'user_id'     => $uid,
                    'notified_at' => $now,
                    'created_at'  => $now,
                    'updated_at'  => $now,
                ]);
            }
        }

        $this->sendNotification($uids, $instance, $action, true);
    }

    /** 条件求值（简单表达式） */
    private function evaluateCondition(?string $condition, array $formData): bool
    {
        if (!$condition) return true;
        $pattern = '/^(\w+)\s*(==|!=|>|<|>=|<=)\s*(.+)$/';
        if (!preg_match($pattern, $condition, $m)) {
            throw new BusinessException("条件格式错误: {$condition}");
        }
        $field = $m[1]; $op = $m[2]; $value = trim($m[3], "\"'");
        $actual = $formData[$field] ?? null;
        if (is_numeric($value) && is_numeric($actual)) { $value=(float)$value; $actual=(float)$actual; }
        return match ($op) {
            '==' => $actual == $value,
            '!=' => $actual != $value,
            '>'  => $actual >  $value,
            '<'  => $actual <  $value,
            '>=' => $actual >= $value,
            '<=' => $actual <= $value,
            default => throw new BusinessException("不支持的操作符: {$op}"),
        };
    }

    /** 获取下一个有效步骤索引（考虑 condition） */
    private function getNextStepIndex(array $steps, array $formData, int $currentStepIndex): ?int
    {
        for ($i = $currentStepIndex + 1; $i < count($steps); $i++) {
            $s = $steps[$i];
            if (!isset($s['condition']) || $this->evaluateCondition($s['condition'], $formData)) {
                return $i;
            }
        }
        return null;
    }

    /**
     * 聚合本步骤结论（按类型）
     * 返回：'pending' | 'approve' | 'reject'
     *
     * any：有 reject => reject；否则有 approve => approve；否则 pending
     * all：有 reject => reject；有 pending => pending；否则（全 approved 或 approved+skipped/timeout）=> approve
     */
    private function getStepOutcome(int $instanceId, int $stepIndex, string $type): string
    {
        $records = Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->where('step_index', $stepIndex)
            ->get();

        $pending = 0; $approved = 0; $rejected = 0;
        foreach ($records as $r) {
            if ($r->status === 'pending')     { $pending++; }
            elseif ($r->status === 'approved'){ $approved++; }
            elseif ($r->status === 'rejected'){ $rejected++; }
            // skipped/timeout 不影响聚合结论
        }

        $type = strtolower($type);
        if ($type === 'any') {
            if ($rejected > 0) return 'reject';
            if ($approved > 0) return 'approve';
            return 'pending';
        }
        // all
        if ($rejected > 0) return 'reject';
        if ($pending  > 0) return 'pending';
        return $approved > 0 ? 'approve' : 'pending';
    }

    /** 关闭本步其余待办为 skipped */
    private function closeOtherPending(int $instanceId, int $stepIndex, array $keepApproverIds = []): void
    {
        $now = date('Y-m-d H:i:s');
        $q = Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->where('step_index', $stepIndex)
            ->where('status', 'pending');

        if (!empty($keepApproverIds)) $q->whereNotIn('approver_id', $keepApproverIds);

        $q->update(['status'=>'skipped','approved_at'=>$now,'updated_at'=>$now]);
    }

    /** 创建待办（去重） */
    private function insertApprovalRecord(int $instanceId, int $stepIndex, int $approverId): void
    {
        $now = date('Y-m-d H:i:s');
        $exists = Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->where('step_index', $stepIndex)
            ->where('approver_id', $approverId)
            ->count() > 0;
        if (!$exists) {
            Db::table('approval_records')->insert([
                'instance_id' => $instanceId,
                'approver_id' => $approverId,
                'step_index'  => $stepIndex,
                'action'      => null,
                'status'      => 'pending',
                'comment'     => null,
                'approved_at' => null,
                'created_at'  => $now,
                'updated_at'  => $now,
            ]);
        }
    }

    /** 发送通知（接你自己的消息系统即可） */
    private function sendNotification(array $userIds, object $instance, string $action, bool $isCC): void
    {
        $map = ['pending'=>'待审批','approve'=>'已通过','reject'=>'已拒绝','revoked'=>'已撤回'];
        $prefix = $isCC ? '[抄送]' : '';
        $text = $map[$action] ?? $action;
        $msg = "{$prefix}您有一条审批 {$text}：流程ID {$instance->id}，类型 {$instance->flow_type}";
        // MessageService::send($userIds, $msg);

        $pushData = [
            'sender_id'     => 0,
            'sender_type'   => 'system',
            'title'         => $msg,
            'content'       => $msg,
            'scene'         => 1,
            'recipient'     => $userIds,
            'push_method'   => 1
        ];
        $msgId = (new MessageNotificationsService())->pushNotice($pushData);
        var_dump($msgId);
    }

    private function notifyInitiator(object $instance, string $result): void
    {
        $this->sendNotification([(int)$instance->initiator_id], $instance, $result, false);
    }

    // ---------- 数据访问（roles / user_roles 结构） ----------

    /**
     * 从角色取用户ID
     * @param mixed    $roleIdOrName  数字 => role_id；字符串 => roles.name
     * @param int|null $systemId      限定 roles.system_id；null 不限定
     * @param bool     $onlyActive    仅取 status=1 角色，默认 true
     * @param bool     $includeGlobal 是否包含全局角色(system_id=0)，默认 true
     */
    private function getUserIdsByRole($roleIdOrName, ?int $systemId = null, bool $onlyActive = true, bool $includeGlobal = true): array
    {
        if (is_int($roleIdOrName) || (is_string($roleIdOrName) && ctype_digit($roleIdOrName))) {
            $roleId = (int)$roleIdOrName;
            $needJoin = $onlyActive || !is_null($systemId) || $includeGlobal === false;

            if (!$needJoin) {
                $rows = Db::table('user_roles')->where('role_id', $roleId)->select('user_id')->get();
            } else {
                $q = Db::table('user_roles as ur')
                    ->join('roles as r', 'ur.role_id', '=', 'r.id')
                    ->where('ur.role_id', $roleId)
                    ->select('ur.user_id');
                if ($onlyActive) $q->where('r.status', 1);
                if (!is_null($systemId)) {
                    $includeGlobal ? $q->whereIn('r.system_id', [0, $systemId]) : $q->where('r.system_id', $systemId);
                }
                $rows = $q->get();
            }
        } else {
            $name = (string)$roleIdOrName;
            $q = Db::table('user_roles as ur')
                ->join('roles as r', 'ur.role_id', '=', 'r.id')
                ->where('r.name', $name)
                ->select('ur.user_id');
            if ($onlyActive) $q->where('r.status', 1);
            if (!is_null($systemId)) {
                $includeGlobal ? $q->whereIn('r.system_id', [0, $systemId]) : $q->where('r.system_id', $systemId);
            }
            $rows = $q->get();
        }

        $ids = [];
        foreach ($rows as $row) $ids[] = (int)$row->user_id;
        return array_values(array_unique($ids));
    }

    private function getLeaderIdByUserId(int $userId): ?int
    {
        $id = Db::table('user')->where('id', $userId)->value('report_to');
        return $id ? (int)$id : null;
    }

    private function getDeptHeadId(int $deptId): ?int
    {
        $id = Db::table('departments')->where('id', $deptId)->value('head_user_id');
        return $id ? (int)$id : null;
    }


    /**
     * 查询某个审批实例的审批记录（附带步骤名/类型，可选带出审批人姓名）
     *
     * @param int         $instanceId
     * @param string|null $userNameColumn  可选：如 'name' 或 'nickname'。传 null 则不 join 用户表
     * @return array{
     *   instance: array,
     *   steps: array<int, array{name:string,type:string,condition?:string}>,
     *   records: array<int, array{
     *     id:int, instance_id:int, approver_id:int, step_index:int,
     *     action:?string, status:string, comment:?string,
     *     approved_at:?string, created_at:?string, updated_at:?string,
     *     approver_name?:?string,
     *     step_name:string, step_type:string,
     *   }>,
     *   summary: array{approved:int,rejected:int,pending:int,skipped:int,timeout:int,total:int}
     * }
     */
    public function getInstanceRecords(int $instanceId, ?string $userNameColumn = null): array
    {
        // 1) 实例 + 流程步骤
        $instance = Db::table('approval_instances')->where('id', $instanceId)->first();
        if (!$instance) {
            throw new BusinessException('审批实例未找到');
        }
        $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) {
            throw new BusinessException('审批流程定义未找到');
        }
        $steps = json_decode($flow->steps, true) ?: [];

        // 2) 记录查询（可选带出审批人姓名）
        if ($userNameColumn) {
            // 注意：确保 user 表存在该列
            $records = Db::table('approval_records as ar')
                ->leftJoin('user as u', 'ar.approver_id', '=', 'u.id')
                ->where('ar.instance_id', $instanceId)
                ->orderBy('ar.step_index')
                ->orderByRaw('COALESCE(ar.approved_at, ar.created_at) asc')
                ->select(
                    'ar.*',
                    Db::raw("u.`{$userNameColumn}` as approver_name")
                )
                ->get()
                ->toArray();
        } else {
            $records = Db::table('approval_records as ar')
                ->where('ar.instance_id', $instanceId)
                ->orderBy('ar.step_index')
                ->orderByRaw('COALESCE(ar.approved_at, ar.created_at) asc')
                ->select('ar.*')
                ->get()
                ->toArray();
        }

        // 3) 附加步骤名/类型；统计汇总
        $summary = ['approved'=>0,'rejected'=>0,'pending'=>0,'skipped'=>0,'timeout'=>0,'total'=>0];
        foreach ($records as &$r) {
            $idx = (int)$r->step_index;
            $meta = $steps[$idx] ?? [];
            $r->step_name = $meta['name'] ?? ('Step '.$idx);
            $r->step_type = $meta['type'] ?? 'all';

            if (isset($summary[$r->status])) {
                $summary[$r->status]++;
            }
            $summary['total']++;
        }
        unset($r);

        return [
            'instance' => [
                'id'           => (int)$instance->id,
                'flow_type'    => $instance->flow_type,
                'biz_type'     => $instance->biz_type,
                'biz_id'       => $instance->biz_id,
                'status'       => $instance->status,
                'current_step' => (int)$instance->current_step,
                'created_at'   => $instance->created_at,
                'updated_at'   => $instance->updated_at,
                'finished_at'  => $instance->finished_at,
            ],
            'steps'   => array_map(function($s){
                return [
                    'name'      => $s['name'] ?? '',
                    'type'      => $s['type'] ?? 'all',
                    'condition' => $s['condition'] ?? null,
                ];
            }, $steps),
            'records' => array_map(function($r){
                // 转成数组（Illuminate 返回的是 stdClass）
                return [
                    'id'           => (int)$r->id,
                    'instance_id'  => (int)$r->instance_id,
                    'approver_id'  => (int)$r->approver_id,
                    'step_index'   => (int)$r->step_index,
                    'action'       => $r->action,
                    'status'       => $r->status,
                    'comment'      => $r->comment,
                    'approved_at'  => $r->approved_at,
                    'created_at'   => $r->created_at,
                    'updated_at'   => $r->updated_at,
                    'approver_name'=> property_exists($r, 'approver_name') ? $r->approver_name : null,
                    'step_name'    => $r->step_name,
                    'step_type'    => $r->step_type,
                ];
            }, $records),
            'summary' => $summary,
        ];
    }

    /**
     * 极简：审批实例的时间轴（只返回每一步的总状态）
     *
     * @param int $instanceId
     * @return array<int, array{index:int,name:string,type:string,status:string}>
     */
    public function getSimpleTimeline1(int $instanceId): array
    {
        // 基础数据
        $instance = Db::table('approval_instances')->where('id', $instanceId)->first();
        if (!$instance) throw new BusinessException('审批实例未找到');
        $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) throw new BusinessException('审批流程定义未找到');

        $steps = json_decode($flow->steps, true) ?: [];
        $formData = json_decode($instance->form_data ?? '{}', true) ?: [];
        $currentStep = (int)$instance->current_step;

        // 读出所有记录并分组
        $records = Db::table('approval_records as ar')
            ->where('ar.instance_id', $instanceId)
            ->orderBy('ar.step_index')
            ->orderByRaw('COALESCE(ar.approved_at, ar.created_at) asc')
            ->select('ar.*')
            ->get()
            ->toArray();

        $byStep = [];
        foreach ($records as $r) {
            $idx = (int)$r->step_index;
            $byStep[$idx][] = $r;
        }

        $timeline = [];

        foreach ($steps as $i => $meta) {
            $name = $meta['name'] ?? ('Step '.$i);
            $typeRaw = strtolower($meta['type'] ?? 'all');
            $type = in_array($typeRaw, ['any','all']) ? $typeRaw : 'all';
            $condStr = $meta['condition'] ?? null;
            $condOk = $condStr ? $this->evaluateCondition($condStr, $formData) : true;

            $recs = $byStep[$i] ?? [];
            $hasRecs = !empty($recs);

            // 默认状态
            $status = 'pending';

            if ($hasRecs) {
                // 统计是否全部 timeout（且无 approve/reject/pending）
                $cnt = ['pending'=>0,'approved'=>0,'rejected'=>0,'timeout'=>0];
                foreach ($recs as $rr) {
                    if (isset($cnt[$rr->status])) $cnt[$rr->status]++;
                }

                // 用已有的聚合规则拿到结论
                $outcome = $this->getStepOutcome($instanceId, $i, $type); // 'pending'|'approve'|'reject'

                if ($outcome === 'reject') {
                    $status = 'rejected';
                } elseif ($outcome === 'approve') {
                    $status = 'approved';
                } else {
                    // 没有结论，再看是不是纯超时
                    if ($cnt['timeout'] > 0 && $cnt['approved'] === 0 && $cnt['rejected'] === 0 && $cnt['pending'] === 0) {
                        $status = 'timeout';
                    } else {
                        $status = 'processing';
                    }
                }
            } else {
                // 无记录：根据位置与条件判断展示
                if ($i < $currentStep) {
                    $status = $condOk ? 'approved' : 'skipped';
                } elseif ($i === $currentStep && $instance->status === 'processing') {
                    // 理论上当前步应有记录；防御性展示为 processing
                    $status = 'processing';
                } else {
                    $status = $condOk ? 'pending' : 'skipped';
                }
            }

            $timeline[] = [
                'index'  => (int)$i,
                'name'   => $name,
                'type'   => $type,   // any | all
                'status' => $status, // approved | rejected | processing | pending | skipped | timeout
            ];
        }

        return $timeline;
    }


    /**
     * 极简时间轴（含每步时间 & 申请人信息）
     *
     * @param int         $instanceId
     * @param string|null $userNameColumn        申请人姓名列（如 'name' / 'nickname'）。不需要就传 null
     * @param string      $initiatorPlacement    'prepend' | 'attach'
     *        - 'prepend'：在最前插入一条“发起申请”块（推荐）
     *        - 'attach' ：把申请人信息并到第一步的返回项里（不新增块）
     *
     * 返回：按显示顺序的数组，每项：
     * {
     *   index:int           // 步骤索引；若为“发起申请”块则为 -1
     *   name:string         // 步骤名或“发起申请”
     *   type:string         // any|all 或 '-'（发起块）
     *   status:string       // approved|rejected|processing|pending|skipped|timeout|submitted(发起块)
     *   started_at:?string
     *   finished_at:?string
     *   duration_seconds:?int
     *   // 仅发起块或 attach 时的第一步会包含：
     *   initiator_id?:int
     *   initiator_name?:?string
     * }
     */
    public function getSimpleTimeline(int $instanceId, ?string $userNameColumn = null, string $initiatorPlacement = 'prepend'): array
    {
        // 基础数据
        $instance = Db::table('approval_instances')->where('id', $instanceId)->first();
        if (!$instance) throw new BusinessException('审批实例未找到');

        $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) throw new BusinessException('审批流程定义未找到');

        $steps     = json_decode($flow->steps, true) ?: [];
        $formData  = json_decode($instance->form_data ?? '{}', true) ?: [];
        $curStep   = (int)$instance->current_step;

        // 申请人
        $initiatorId   = (int)$instance->initiator_id;
        $initiatorName = null;
        if ($userNameColumn) {
            $initiatorName = Db::table('user')->where('id', $initiatorId)->value($userNameColumn);
        }

        // 审批记录
        $records = Db::table('approval_records as ar')
            ->where('ar.instance_id', $instanceId)
            ->orderBy('ar.step_index')
            ->orderByRaw('COALESCE(ar.approved_at, ar.created_at) asc')
            ->select('ar.*')
            ->get()
            ->toArray();

        $byStep = [];
        foreach ($records as $r) {
            $idx = (int)$r->step_index;
            $byStep[$idx][] = $r;
        }

        $timeline = [];

        // 可选：先插入“发起申请”块（index = -1）
        if ($initiatorPlacement === 'prepend') {
            $appliedAt = $instance->created_at ?: null;
            $timeline[] = [
                'index'            => -1,
                'name'             => '发起申请',
                'type'             => '-',
                'status'           => 'submitted',
                'started_at'       => $appliedAt,
                'finished_at'      => $appliedAt,
                'duration_seconds' => 0,
                'initiator_id'     => $initiatorId,
                'initiator_name'   => $initiatorName,
            ];
        }

        // 每一步
        foreach ($steps as $i => $meta) {
            $name    = $meta['name'] ?? ('Step '.$i);
            $typeRaw = strtolower($meta['type'] ?? 'all');
            $type    = in_array($typeRaw, ['any','all']) ? $typeRaw : 'all';
            $condStr = $meta['condition'] ?? null;
            $condOk  = $condStr ? $this->evaluateCondition($condStr, $formData) : true;

            $recs    = $byStep[$i] ?? [];
            $hasRecs = !empty($recs);

            $status      = 'pending';
            $startedAt   = null;
            $finishedAt  = null;
            $durationSec = null;

            if ($hasRecs) {
                // 统计时间
                $minCreated   = null;
                $minApproveAt = null; $maxApproveAt = null;
                $minRejectAt  = null;
                $maxTimeoutAt = null;
                $cnt = ['pending'=>0,'approved'=>0,'rejected'=>0,'timeout'=>0];

                foreach ($recs as $rr) {
                    if ($rr->created_at && (!$minCreated || $rr->created_at < $minCreated)) $minCreated = $rr->created_at;
                    if ($rr->approved_at) {
                        if ($rr->status === 'approved') {
                            if (!$minApproveAt || $rr->approved_at < $minApproveAt) $minApproveAt = $rr->approved_at;
                            if (!$maxApproveAt || $rr->approved_at > $maxApproveAt) $maxApproveAt = $rr->approved_at;
                        } elseif ($rr->status === 'rejected') {
                            if (!$minRejectAt || $rr->approved_at < $minRejectAt) $minRejectAt = $rr->approved_at;
                        } elseif ($rr->status === 'timeout') {
                            if (!$maxTimeoutAt || $rr->approved_at > $maxTimeoutAt) $maxTimeoutAt = $rr->approved_at;
                        }
                    }
                    if (isset($cnt[$rr->status])) $cnt[$rr->status]++;
                }

                $startedAt = $minCreated;

                // 总结果
                $outcome = $this->getStepOutcome($instanceId, $i, $type); // 'pending'|'approve'|'reject'
                if ($outcome === 'reject') {
                    $status     = 'rejected';
                    $finishedAt = $minRejectAt;
                } elseif ($outcome === 'approve') {
                    $status     = 'approved';
                    $finishedAt = ($type === 'any') ? $minApproveAt : $maxApproveAt;
                } else {
                    if ($cnt['timeout'] > 0 && $cnt['approved'] === 0 && $cnt['rejected'] === 0 && $cnt['pending'] === 0) {
                        $status     = 'timeout';
                        $finishedAt = $maxTimeoutAt;
                    } else {
                        $status = 'processing';
                    }
                }

                if ($startedAt && $finishedAt) {
                    $durationSec = max(0, strtotime($finishedAt) - strtotime($startedAt));
                }
            } else {
                // 无记录：根据位置与条件展示
                if ($i < $curStep) {
                    $status = $condOk ? 'approved' : 'skipped';
                } elseif ($i === $curStep && $instance->status === 'processing') {
                    $status = 'processing';
                } else {
                    $status = $condOk ? 'pending' : 'skipped';
                }
            }

            $row = [
                'index'            => (int)$i,
                'name'             => $name,
                'type'             => $type,
                'status'           => $status,
                'started_at'       => $startedAt,
                'finished_at'      => $finishedAt,
                'duration_seconds' => $durationSec,
            ];

            // 如果需要把申请人信息“并到第一步”而不是独立一块
            if ($initiatorPlacement === 'attach' && empty($timeline)) {
                $row['initiator_id']   = $initiatorId;
                $row['initiator_name'] = $initiatorName;
            }

            $timeline[] = $row;
        }

        return $timeline;
    }

}