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

use support\Db;
use support\exception\BusinessException;

trait ApprovalQueryTrait
{
    /** 流程图数据 */
    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', $instanceId)
            ->where('round', (int)$instance->round)
            ->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;
    }

    /** 查询某个审批实例的审批记录 */
    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,
        ];
    }

    /** 简单时间线 */
    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;
        $round     = (int)$instance->round;

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

        // 一次性拉取姓名，避免 N+1
        $nameMap = [];
        if ($userNameColumn && !empty($records)) {
            $uids = [];
            foreach ($records as $r) $uids[] = (int)$r->approver_id;
            $uids = array_values(array_unique($uids));
            if (!empty($uids)) {
                $pairs = Db::table('user')->whereIn('id', $uids)->pluck($userNameColumn, 'id')->toArray();
                foreach ($pairs as $uid => $name) $nameMap[(int)$uid] = $name;
            }
        }

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

        $timeline = [];

        // 可选：发起申请块
        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;

            //  每一步的“审批意见”（只展示有内容的 comment）
            $opinions = []; // [{approver_id, approver_name?, action, status, comment, time}...]

            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) {
                    // 收集“审批意见”（非空 comment 都算）
                    $cmt = trim((string)($rr->comment ?? ''));
                    if ($cmt !== '') {
                        $opinions[] = [
                            'approver_id'   => (int)$rr->approver_id,
                            'approver_name' => $userNameColumn ? ($nameMap[(int)$rr->approver_id] ?? null) : null,
                            'action'        => $rr->action,         // approve | reject | null
                            'status'        => $rr->status,         // approved|rejected|pending|skipped|timeout
                            'comment'       => $cmt,
                            'time'          => $rr->approved_at ?: $rr->created_at,
                        ];
                    }

                    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]++;
                }

                // 时间升序排序 opinions
                if (!empty($opinions)) {
                    usort($opinions, function($a, $b) {
                        return strcmp($a['time'] ?? '', $b['time'] ?? '');
                    });
                }

                $startedAt = $minCreated;

                // 总结果（注意：这里按你现在的签名调用，含 round）
                $outcome = $this->getStepOutcome($instanceId, $round, $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,
                'opinions'         => $opinions,  //  这就是每个审批意见
            ];

            // 把申请人信息并到第一步（可选）
            if ($initiatorPlacement === 'attach' && empty($timeline)) {
                $row['initiator_id']   = $initiatorId;
                $row['initiator_name'] = $initiatorName;
            }

            $timeline[] = $row;
        }

        return $timeline;
    }

    /** 按业务ID获取“最新进展”的极简状态 */
    public function getBriefStatusByBiz(string $bizId, ?string $bizType = null, ?string $userNameColumn = null): array
    {
        // 1) 最新实例
        $q = Db::table('approval_instances')->where('biz_id', $bizId);
        if ($bizType !== null && $bizType !== '') {
            $q->where('biz_type', $bizType);
        }
        $instance = $q->orderByDesc('id')->first();
        if (!$instance) {
            // throw new BusinessException('未找到对应的审批实例');
            return [];
        }

        $base = [
            'instance_id' => (int)$instance->id,
            'flow_type'   => $instance->flow_type,
            'biz_type'    => $instance->biz_type,
            'biz_id'      => $instance->biz_id,
            'status'      => $instance->status,
            'finished_at' => $instance->finished_at,
            'updated_at'  => $instance->updated_at,
        ];

        // 2) 已完结：直接返回
        if ($instance->status !== 'processing') {
            return $base;
        }

        // 3) 进行中：取当前步骤 + 当前 pending 审批者
        $flow  = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) {
            // 容错：没有流程定义
            return $base;
        }
        $steps = json_decode($flow->steps, true) ?: [];
        $idx   = (int)$instance->current_step;
        $round = (int)$instance->round;
        $meta  = $steps[$idx] ?? [];

        $typeRaw = strtolower($meta['type'] ?? 'all');
        $type    = in_array($typeRaw, ['any','all']) ? $typeRaw : 'all';

        // 当前步的所有记录
        $recsQ = Db::table('approval_records')->where('instance_id', $instance->id)->where('step_index', $idx);

        // 待处理人（只列出 pending）
        if ($userNameColumn) {
            $pendingRows = Db::table('approval_records as ar')
                ->leftJoin('user as u', 'ar.approver_id', '=', 'u.id')
                ->where('ar.instance_id', $instance->id)
                ->where('ar.round', $round)
                ->where('ar.step_index', $idx)
                ->where('ar.status', 'pending')
                ->select('ar.approver_id', Db::raw("u.`{$userNameColumn}` as approver_name"))
                ->get()
                ->toArray();
        } else {
            $pendingRows = Db::table('approval_records')
                ->where('instance_id', $instance->id)
                ->where('round', $round)
                ->where('step_index', $idx)
                ->where('status', 'pending')
                ->select('approver_id')
                ->get()
                ->toArray();
        }

        $pendingApprovers = [];
        foreach ($pendingRows as $r) {
            $row = ['approver_id' => (int)$r->approver_id];
            if ($userNameColumn && property_exists($r, 'approver_name')) {
                $row['approver_name'] = $r->approver_name;
            }
            $pendingApprovers[] = $row;
        }

        // 当前步的聚合状态（进行中通常返回 processing；若全被超时任务置为 timeout，则返回 timeout）
        // 先快速统计是否纯 timeout
        $stats = Db::table('approval_records')
            ->where('instance_id', $instance->id)
            ->where('round', $round)
            ->where('step_index', $idx)
            ->selectRaw("SUM(CASE WHEN status='pending' THEN 1 ELSE 0 END) as c_pending")
            ->selectRaw("SUM(CASE WHEN status='approved' THEN 1 ELSE 0 END) as c_approved")
            ->selectRaw("SUM(CASE WHEN status='rejected' THEN 1 ELSE 0 END) as c_rejected")
            ->selectRaw("SUM(CASE WHEN status='timeout' THEN 1 ELSE 0 END) as c_timeout")
            ->first();

        $stepStatus = 'processing';
        if ($stats && (int)$stats->c_timeout > 0 && (int)$stats->c_pending === 0 && (int)$stats->c_approved === 0 && (int)$stats->c_rejected === 0) {
            $stepStatus = 'timeout';
        }

        $base['step'] = [
            'index'             => $idx,
            'name'              => $meta['name'] ?? ('Step '.$idx),
            'type'              => $type,               // any|all
            'status'            => $stepStatus,         // processing|timeout
            'pending_approvers' => $pendingApprovers,   // 当前正在等待的审批者
        ];

        return $base;
    }

    /** 登录/首屏初始化：获取当前用户的待办总数 */
    public function getInitTodoCount(int $userId): int
    {
        $userId = (int)$userId;
        if ($userId <= 0) {
            throw new BusinessException('无效的用户ID');
        }

        $row = Db::table('approval_records as ar')
            ->join('approval_instances as ai', 'ai.id', '=', 'ar.instance_id')
            ->where('ar.approver_id', $userId)
            ->where('ar.status', 'pending')
            ->where('ai.status', 'processing')
            // 只统计实例“当前轮次、当前步骤”的待办，避免历史残留干扰
            ->whereRaw('ar.round = ai.round')
            ->whereRaw('ar.step_index = ai.current_step')
            ->selectRaw('COUNT(*) as c')
            ->first();

        return (int)($row->c ?? 0);
    }
}