<?php

namespace app\common\service;

use app\common\model\User;
use app\common\validate\InvRequisitionApproveValidate;
use app\common\traits\crud\CrudServiceTrait;
use app\common\model\InvRequisitionApprove;
use support\Db;
use support\exception\BusinessException;

class InvRequisitionApproveService
{

    use CrudServiceTrait;

    /**
     * 指定当前要操作的模型
     */
    protected string $modelClass = InvRequisitionApprove::class;

    /**
     * 验证器
     */
    protected $validator = InvRequisitionApproveValidate::class;

    /**
     * 获取验证器
     */
    public function getValidator()
    {
        return  new $this->validator;
    }

    /**
     * @param string $flowType
     * @param string $bizType
     * @param string $bizId
     * @param array $formData ['manage_user_id'=>23]//物品管理员
     * @param int $initiatorId //申请人id
     * @return array
     */
    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');
            $now = time();


            $service = new \app\common\utils\approval\service\ApprovalFlowService();

            // 解析首步审批人（支持 role_id 或 roles.name）
            $instance = (object)[
                'initiator_id' => $initiatorId,
                'form_data'=>json_encode($formData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)
            ];
            $approverIds = $service->StetApprovers($firstStep, $instance, true);

            if(empty($approverIds)){
                throw  new BusinessException('未解析到任何审批人');
            }
            $uid = array_shift($approverIds);
            $approver = User::where('id', $uid)->first();

            $approveId = Db::table('inv_requisition_approve')->insertGetId([
                'requisition_id' => $bizId, //申请单ID
                'node_type' => $bizType,
                'approver_id' => $approver->id,
                'approver_name' => $approver->name,
                'action' => 0,
                'comment'    => '',
                'created_at'   => $now,
                'updated_at'   => $now,
            ]);

//            foreach ($approverIds as $uid) {
//                $this->insertApprovalRecord($instance, $firstIndex, $uid);
//            }

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

    /** 执行审批 */
    public function approve(int $requisitionId, int $approverId, string $action, string $comment = '')
    {
        if (!in_array($action, ['1','2'], true)) { //审批动作：1通过 2驳回
            throw new BusinessException("无效的审批操作");
        }

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

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

            $steps = json_decode($flow->steps, true);
            //$idx   = (int)$requisition->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('inv_requisition_approve')
                ->where('requisition_id', $requisitionId)
                ->where('approver_id', $approverId)
                ->where('action', 0)
                ->lockForUpdate()
                ->first();

            if (!$pendingRecord) {
                // 已处理过？
                $anyRecord = Db::table('inv_requisition_approve')
                    ->where('requisition_id', $requisitionId)
                    ->where('approver_id', $approverId)
                    ->first();
                if ($anyRecord && $anyRecord->action > 0) {
                    return ['status' => 'noop', 'msg' => '已处理'];
                }
                // 步骤已推进
//                if ((int)$requisition->current_step !== $idx) {
//                    return ['status' => 'noop', 'msg' => '非当前审批'];
//                }
                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('inv_requisition_approve')->where('id', $pendingRecord->id)->update([
                'action'      => $action,
                'comment'     => $comment,
                'approved_at' => $now,
                'updated_at'  => $now,
            ]);

            // 2) 已通过步骤与总步数相等则结束审核流程
            $pass = Db::table('inv_requisition_approve')
                ->where('requisition_id', $requisitionId)
                ->where('approver_id', $approverId)
                ->where('action', 1)
                ->count();
            if($action == 1){
                if(count($steps) == $pass){
                    $requisition->status = 12;
                    $requisition->save();
                    return ['status' => 'complete', 'msg' => '已通过'];
                }
            }

            // 3) 拒绝 => 结束
            if($action == 2){
                Db::table('inv_requisition_approve')->where('id', $pendingRecord->id)->update([
                    'action'      => $action,
                    'comment'     => $comment,
                    'approved_at' => $now,
                    'updated_at'  => $now,
                ]);
                if(count($steps) == $pass){
                    $requisition->status = 13;
                    $requisition->save();
                    return ['status' => 'complete', 'msg' => '拒绝'];
                }
            }


            // 4) 通过 => 进入下一步或结束
            $formData  = ['manage_user_id'=>''];

            $nextIndex = $pass;
            $nextStep = $steps[$nextIndex];
            $service = new \app\common\utils\approval\service\ApprovalFlowService();

            $instance = (object)[
                'form_data'=>json_encode($formData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)
            ];
            $approverIds = $service->StetApprovers($nextStep, $instance, true);
            $approver = User::where('id', array_pop($approverIds))->first();
            Db::table('inv_requisition_approve')->insertGetId([
                'requisition_id' => $requisitionId, //申请单ID
                'node_type' => $nextStep['approvers']['initiator_leader'],
                'approver_id' => $approver->id,
                'approver_name' => $approver->name,
                'action' => 0,
                'comment'    => '',
                'created_at'   => $now,
                'updated_at'   => $now,
            ]);;

        });
    }

//    public function insertApprovalRecord()
//    {
//    }


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

}