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

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

use app\common\approval\model\ApprovalCcs;
use app\common\approval\model\ApprovalFlows;
use app\common\approval\model\ApprovalInstances;
use app\common\approval\model\ApprovalRecords;

class ApprovalFlowService_bak 
{
    // --- 公共方法 ---

    /**
     * 启动一个审批实例
     * @param string $flowType 流程类型标识 (approval_flows.type)
     * @param string $bizType 业务类型标识 (如 'leave_application')
     * @param string $bizId 业务数据ID (如 leave_applications 表的 ID)
     * @param array $formData 提交的表单数据快照
     * @param int $initiatorId 发起人ID
     * @return array ['success' => true, 'instance_id' => ...] 或抛出异常
     */
    public function start(string $flowType, string $bizType, string $bizId, array $formData, int $initiatorId): array
    {
        // 1. 获取流程定义
        $flow = Db::table('approval_flows')
            ->where('type', $flowType)
            ->where('is_active', 1)
            ->first();
        
        if (!$flow) {
            throw new BusinessException("审批流程 '{$flowType}' 不存在或已停用");
        }

        // 2. 创建审批实例
        $instanceId = Db::table('approval_instances')->insertGetId([
            'flow_type' => $flowType,
            'biz_id' => $bizId,
            'biz_type' => $bizType,
            'form_data' => json_encode($formData),
            'initiator_id' => $initiatorId,
            'status' => 'processing',
            'current_step' => 0,
            'deadline_at' => $flow->timeout_hours > 0 ? 
                (new DateTime())->modify("+{$flow->timeout_hours} hours")->format('Y-m-d H:i:s') : null,
            'created_at' => date('Y-m-d H:i:s'),
            'updated_at' => date('Y-m-d H:i:s'),
        ]);

        // 3. 通知下一个审批人
        $this->notifyNextApprovers($instanceId);

        return ['success' => true, 'instance_id' => $instanceId];
    }

    /**
     * 执行审批操作
     * @param int $instanceId 审批实例ID
     * @param int $approverId 审批人ID
     * @param string $action 操作 (approve, reject, revoke)
     * @param string $comment 审批意见
     * @return array 操作结果
     */
    public function approve(int $instanceId, int $approverId, string $action, string $comment = ''): array
    {
        // 1. 获取实例和流程
        $instance = Db::table('approval_instances')->find($instanceId);
        if (!$instance) {
            throw new BusinessException("审批实例不存在");
        }
        if ($instance->status !== 'processing') {
            throw new BusinessException("审批实例状态不正确");
        }

        $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
        if (!$flow) {
            throw new BusinessException("关联的审批流程不存在");
        }

        $steps = json_decode($flow->steps, true);
        $currentStepIndex = $instance->current_step;

        if ($currentStepIndex >= count($steps)) {
            throw new BusinessException("审批流程已结束");
        }

        $currentStep = $steps[$currentStepIndex];

        // 2. 验证权限和条件
        if (!$this->canUserApproveStep($currentStep, $approverId, $instance)) {
            throw new BusinessException("您无权审批此步骤");
        }

        // 3. 记录审批行为
        Db::table('approval_records')->insert([
            'instance_id' => $instanceId,
            'approver_id' => $approverId,
            'step_index' => $currentStepIndex,
            'action' => $action,
            'comment' => $comment,
            'approved_at' => date('Y-m-d H:i:s'),
            'created_at' => date('Y-m-d H:i:s'),
            'updated_at' => date('Y-m-d H:i:s'),
        ]);

        // 4. 处理审批结果
        $updateData = ['updated_at' => date('Y-m-d H:i:s')];
        if ($action === 'reject') {
            $updateData['status'] = 'rejected';
            $updateData['finished_at'] = date('Y-m-d H:i:s');
            Db::table('approval_instances')->where('id', $instanceId)->update($updateData);
            $this->notifyInitiator($instance, 'rejected');
            return ['result' => 'rejected'];
        }

        if ($action === 'revoke') {
            if ($instance->initiator_id !== $approverId || $instance->status !== 'processing') {
                throw new BusinessException("无权撤回或状态不允许");
            }
            $updateData['status'] = 'revoked';
            $updateData['finished_at'] = date('Y-m-d H:i:s');
            Db::table('approval_instances')->where('id', $instanceId)->update($updateData);
            $this->notifyAllApprovers($instance, 'revoked');
            return ['result' => 'revoked'];
        }

        // 5. 处理 approve 逻辑
        $nextStepIndex = $this->calculateNextStepIndex($instanceId, $currentStepIndex, $currentStep);
        $updateData['current_step'] = $nextStepIndex;

        if ($nextStepIndex >= count($steps)) {
            $updateData['status'] = 'approved';
            $updateData['finished_at'] = date('Y-m-d H:i:s');
            Db::table('approval_instances')->where('id', $instanceId)->update($updateData);
            $this->notifyInitiator($instance, 'approved');
            $this->notifyCc($instanceId);
        } else {
            Db::table('approval_instances')->where('id', $instanceId)->update($updateData);
            $this->notifyNextApprovers($instanceId);
        }

        return ['result' => 'approved', 'next_step' => $nextStepIndex];
    }

    /**
     * 获取用户待审批列表
     * @param int $userId 用户ID
     * @return array
     */
    public function getPendingApprovals(int $userId): array
    {
        // 简化查询：找到用户需要审批的实例ID
        // 更复杂的逻辑（如并行会签）需要更精细的查询
        $instanceIds = Db::table('approval_records')
            ->where('approver_id', $userId)
            ->pluck('instance_id')
            ->unique()
            ->toArray();

        if (empty($instanceIds)) {
            return [];
        }

        return Db::table('approval_instances')
            ->whereIn('id', $instanceIds)
            ->where('status', 'processing')
            ->get()
            ->toArray();
    }

    /**
     * 获取审批历史记录
     * @param int $instanceId
     * @return array
     */
    public function getApprovalHistory(int $instanceId): array
    {
        return Db::table('approval_records')
            ->where('instance_id', $instanceId)
            ->orderBy('step_index')
            ->orderBy('approved_at')
            ->get()
            ->toArray();
    }

    /**
     * 获取审批流程图数据 (简化版)
     * @param int $instanceId
     * @return array
     */
    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')
            ->orderBy('approved_at')
            ->get()
            ->groupBy('step_index');

        $diagramData = [];
        foreach ($steps as $index => $step) {
            $status = 'pending';
            $actions = $records->get($index, collect())->toArray();

            if (!empty($actions)) {
                $hasReject = collect($actions)->contains('action', 'reject');
                if ($hasReject) {
                    $status = 'rejected';
                } else {
                    if ($step['type'] === 'parallel') {
                        // 简化处理
                        $status = 'approved';
                    } else {
                        $status = 'approved';
                    }
                }
            } elseif ($index < $instance->current_step) {
                $status = 'approved';
            } elseif ($index == $instance->current_step) {
                $status = 'processing';
            }

            $diagramData[] = [
                'index' => $index,
                'name' => $step['name'],
                'type' => $step['type'],
                'status' => $status,
                'actions' => $actions
            ];
        }
        return $diagramData;
    }

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

        foreach ($expiredInstances as $instance) {
            $flow = Db::table('approval_flows')->where('type', $instance->flow_type)->first();
            if ($flow && $flow->timeout_action) {
                $updateData = [
                    'finished_at' => $now,
                    'updated_at' => $now
                ];
                if ($flow->timeout_action === 'auto_reject') {
                    $updateData['status'] = 'rejected';
                    Db::table('approval_instances')->where('id', $instance->id)->update($updateData);
                    $this->notifyInitiator($instance, 'rejected_timeout');
                } elseif ($flow->timeout_action === 'auto_approve') {
                    $updateData['status'] = 'approved';
                    Db::table('approval_instances')->where('id', $instance->id)->update($updateData);
                    $this->notifyInitiator($instance, 'approved_timeout');
                }
            }
        }
    }

    // --- 辅助方法 ---

    private function canUserApproveStep(array $step, int $userId, object $instance): bool
    {
        $approvers = $this->resolveApprovers($step, $instance);
        return in_array($userId, $approvers);
    }

    // private function resolveApprovers(array $step, object $instance): array
    // {
    //     $resolved = [];
    //     foreach ($step['approvers'] as $approver) {
    //         if ($approver['type'] === 'role') {
    //             // 示例：根据角色查找用户ID，你需要替换为实际逻辑
    //             if ($approver['value'] === 'admin') {
    //                 $resolved[] = 1; // 假设 admin 角色的用户ID是1
    //             } elseif ($approver['value'] === 'manager') {
    //                  $resolved[] = 2; $resolved[] = 3; // 假设有多个manager
    //             }
    //         } elseif ($approver['type'] === 'user') {
    //             $resolved[] = (int)$approver['value'];
    //         } elseif ($approver['type'] === 'initiator_leader') {
    //             // 示例：获取发起人的领导
    //             $resolved[] = 4; // 假设领导ID是4
    //         }
    //     }
    //     return array_unique($resolved);
    // }

    private function resolveApprovers(array $step, object $instance): array
    {
        $resolved = [];

        foreach ($step['approvers'] as $approverConfig) {
            $approverIds = [];

            switch ($approverConfig['type']) {
                // 1. 按角色查找
                case 'role':
                    $roleCode = $approverConfig['value'];
                    // 所有拥有该角色的用户ID
                    $approverIds = $this->getUserIdsByRole($roleCode);
                    break;

                // 2. 按具体用户ID
                case 'user':
                    $approverIds = [(int)$approverConfig['value']];
                    break;

                // 3. 按发起人的直属领导 (业务一般是组长)
                case 'initiator_leader':
                    // 用户表中 report_to 字段
                    $approverIds = $this->getLeaderIdByUserId($instance->initiator_id);
                    if ($approverIds) {
                        $approverIds = [$approverIds];
                    } else {
                        $approverIds = []; // 没有领导，跳过
                    }
                    break;

                // 4. 按业务字段关联的用户 (高级功能)
                case 'field_user':
                    $fieldName = $approverConfig['value']; // 如 'project_manager_id'
                    $formData = json_decode($instance->form_data, true);
                    if (isset($formData[$fieldName])) {
                        $approverIds = [(int)$formData[$fieldName]];
                    } else {
                        $approverIds = [];
                    }
                    break;

                // 5. 按组织架构层级 (如发起人所在部门的负责人)
                case 'dept_head':
                    $deptId = $approverConfig['value']; // 也可以从 instance 或 formData 中获取
                    $approverIds = $this->getDeptHeadId($deptId);
                    if ($approverIds) {
                        $approverIds = [$approverIds];
                    } else {
                        $approverIds = [];
                    }
                    break;

                default:
                    throw new BusinessException("不支持的审批人类型: {$approverConfig['type']}");
            }

            $resolved = array_merge($resolved, $approverIds);
        }

        return array_unique($resolved);
    }

    // 角色层
    private function getUserIdsByRole(string $roleCode): array
    {
        // user_roles 表和 roles 表
        return Db::table('user_roles as ur')
            ->join('roles as r', 'ur.role_id', '=', 'r.id')
            ->where('r.code', $roleCode) // 假设 roles 表有 code 字段
            ->pluck('ur.user_id')
            ->toArray();
    }

    // 领导层
    private function getLeaderIdByUserId(int $userId): ?int
    {
        // users 表 report_to 字段
        return Db::table('user')->where('id', $userId)->value('report_to');
    }

    // 组织架构层
    private function getDeptHeadId(int $deptId): ?int
    {
        // departments 表 head_user_id 字段（部门逻辑暂时不用，根据后续业务实际情况开发）
        return Db::table('departments')->where('id', $deptId)->value('head_user_id');
    }

    private function calculateNextStepIndex(int $instanceId, int $currentStepIndex, array $currentStep): int
    {
         // 对于 sequential 和 any，单次 approve 即进入下一步
        if ($currentStep['type'] === 'sequential' || $currentStep['type'] === 'any') {
            return $currentStepIndex + 1;
        } elseif ($currentStep['type'] === 'parallel') {
            // 对于并行会签，需要检查是否所有审批人都已 approve
            // 这里简化处理，实际需要精确计算
            // 假设只要有一次 approve 就算完成（不准确，仅为示例）
            // 正确做法是查询所有 approvers 是否都 approve 了
            return $currentStepIndex + 1;
        }
        return $currentStepIndex + 1;
    }

    private function notifyNextApprovers(int $instanceId)
    {
        // 实现你的通知逻辑，如发送站内信、邮件、企业微信等
        // 可以查询 instance_id 对应的当前步骤审批人
        echo "通知下一个审批人 (Instance ID: {$instanceId})\n";
    }

    private function notifyInitiator(object $instance, string $result)
    {
        // 通知发起人审批结果
        echo "通知发起人 {$instance->initiator_id} 审批结果: {$result}\n";
    }

    private function notifyAllApprovers(object $instance, string $status)
    {
        // 通知所有相关审批人（如撤回时）
        echo "通知所有审批人，实例 {$instance->id} 状态变为: {$status}\n";
    }

    private function notifyCc(int $instanceId)
    {
        // 通知抄送人
        echo "通知抄送人 (Instance ID: {$instanceId})\n";
    }
}