<?php

namespace App\Service;

use App\Model\Employee;
use App\Model\WorkFlowInstances;
use App\Model\WorkFlowInstancesNodes;
use App\Model\WorkFlowTemplates;
use Illuminate\Support\Facades\DB;

class WorkFlowService extends Service
{
    public function workFlowEdit($data,$user){
        list($status,$msg) = $this->workFlowRule($data, $user, false);
        if(!$status) return [$status,$msg];

        try {
            DB::beginTransaction();

            $model = WorkFlowTemplates::where('id', $data['id'])->first();
            $model->code = $data['code'] ?? '';
            $model->title = $data['title'] ?? '';
            $model->content = $data['content'] ?? '';
            $model->save();

            DB::commit();
        }catch (\Exception $exception){
            DB::rollBack();
            return [false,$exception->getMessage()];
        }

        return [true, ''];
    }

    public function workFlowAdd($data,$user){
        list($status,$msg) = $this->workFlowRule($data, $user);
        if(!$status) return [$status,$msg];

        try {
            DB::beginTransaction();

            $model = new WorkFlowTemplates();
            $model->code = $data['code'] ?? '';
            $model->title = $data['title'] ?? '';
            $model->content = $data['content'] ?? '';
            $model->crt_id = $user['id'];
            $model->top_depart_id = $user['top_depart_id'];
            $model->save();

            DB::commit();
        }catch (\Exception $exception){
            DB::rollBack();
            return [false,$exception->getMessage()];
        }

        return [true, ''];
    }

    public function workFlowDetail($data, $user){
        if($this->isEmpty($data,'id')) return [false,'请选择数据！'];
        $customer = WorkFlowTemplates::where('del_time',0)
            ->where('id',$data['id'])
            ->first();
        if(empty($customer)) return [false,'审批流不存在或已被删除'];
        $customer = $customer->toArray();

        $customer['crt_name'] = Employee::where('id',$customer['crt_id'])->value('title');
        $customer['crt_time'] = $customer['crt_time'] ? date("Y-m-d H:i:s",$customer['crt_time']): '';

        return [true, $customer];
    }

    public function workFlowDel($data, $user){
        if($this->isEmpty($data,'id')) return [false,'请选择数据！'];
        $customer = WorkFlowTemplates::where('del_time',0)
            ->where('id',$data['id'])
            ->first();
        if(empty($customer)) return [false,'审批流不存在或已被删除'];
        $customer->del_time = time();
        $customer->save();

        return [true, ''];
    }

    public function workFlowCommon($data,$user, $field = []){
        if(empty($field)) $field = WorkFlowTemplates::$field;

        $model = WorkFlowTemplates::TopClear($user,$data);
        $model = $model->where('del_time',0)
            ->select($field)
            ->orderby('id', 'desc');

        if(! empty($data['title'])) $model->where('title', 'LIKE', '%'.$data['title'].'%');
        if(! empty($data['code'])) $model->where('code', 'LIKE', '%'.$data['code'].'%');
        if(! empty($data['id'])) $model->whereIn('id', $data['id']);
        if(! empty($data['crt_time'][0]) && ! empty($data['crt_time'][1])) {
            $return = $this->changeDateToTimeStampAboutRange($data['crt_time']);
            $model->where('crt_time','>=',$return[0]);
            $model->where('crt_time','<=',$return[1]);
        }

        return $model;
    }

    public function workFlowList($data,$user){
        $model = $this->workFlowCommon($data, $user);
        $list = $this->limit($model,'',$data);
        $list = $this->fillData($list);

        return [true, $list];
    }

    public function workFlowRule(&$data, $user, $is_add = true) {
        if(empty($data['title'])) return [false, '审批流名称不能为空'];
        if(empty($data['code'])) return [false, '审批流编码不能为空'];
        if(empty($data['content'])) return [false, '审批流内容不能为空'];

        // 1. JSON 格式校验与转换
        $content = $data['content'];
        if (is_string($content)) {
            $content = json_decode($content, true);
            if (json_last_error() !== JSON_ERROR_NONE) {
                return [false, '审批流内容格式错误，不是有效的JSON'];
            }
        }

        // 2. 结构完整性校验
        if (!isset($content['nodes']) || !is_array($content['nodes'])) {
            return [false, '审批流配置缺少节点(nodes)信息'];
        }
        if (!isset($content['edges']) || !is_array($content['edges'])) {
            return [false, '审批流配置缺少连线(edges)信息'];
        }

        // 4. 业务唯一性校验
        $query = WorkFlowTemplates::where('code', $data['code'])
            ->where('top_depart_id', $user['top_depart_id'])
            ->where('del_time', 0);

        if (!$is_add) {
            if (empty($data['id'])) return [false, 'ID不能为空'];
            $query->where('id', '<>', $data['id']);
        }

        if ($query->exists()) return [false, '审批流编码已存在'];

        return [true, ''];
    }

    public function fillData($data){
        if(empty($data['data'])) return $data;

        $emp = (new EmployeeService())->getEmployeeMap(array_unique(array_merge_recursive(array_column($data['data'],'charge_id'), array_column($data['data'],'crt_id'))));
        foreach ($data['data'] as $key => $value){
            $data['data'][$key]['crt_time'] = $value['crt_time'] ? date('Y-m-d H:i:s',$value['crt_time']) : '';
            $data['data'][$key]['crt_name'] = $emp[$value['crt_id']] ?? '';
        }

        return $data;
    }

    /**
     * 触发审批流实例
     * * @param string $templateCode 审批流唯一编码
     * @param int $documentId 业务单据ID
     * @param string $documentType 业务模型类名
     * @param array $user 当前操作用户信息
     */
    public function triggerWorkflow($templateCode, $documentId, $documentType, $user)
    {
        // 1. 获取对应的审批流模板
        $template = WorkFlowTemplates::where('code', $templateCode)
            ->where('top_depart_id', $user['top_depart_id'])
            ->where('del_time', 0)
            ->first();

        if (!$template) return [false, '审批模板不存在'];

        // 2. 创建流程主实例
        $instance = WorkFlowInstances::create([
            'template_id'   => $template->id,
            'document_id'   => $documentId,
            'document_type' => $documentType,
            'status'        => 'processing',
            'crt_id'        => $user['id'],
            'crt_time'      => time(),
            'upd_time'      => time(),
            'top_depart_id' => $user['top_depart_id']
        ]);

        // 获取前端原始 JSON 中的节点和连线 [cite: 1]
        $nodes = $template->content['nodes'];
        $edges = $template->content['edges'];

        // 3. 准备批量插入的节点数据
        $insertNodes = [];
        foreach ($nodes as $node) {
            $nodeKey = $node['id'];

            // 从 edges 中寻找当前节点的前置 (source 为谁) 和 后置 (target 为谁) [cite: 1]
            // 这里的 source 和 target 是 edges 顶层的字符串 ID
            $prev = collect($edges)->where('target', $nodeKey)->pluck('source')->first();
            $next = collect($edges)->where('source', $nodeKey)->pluck('target')->first();

            $insertNodes[] = [
                'instance_id'   => $instance->id,
                'node_key'      => $nodeKey,
                'label'         => $node['label'] ?? '未命名节点',
                'prev_node_key' => $prev, // 上级节点 ID
                'next_node_key' => $next, // 下级节点 ID

                // 审批人快照存储 [cite: 1]
                'assignees'     => json_encode($node['data']['assignees'] ?? []),

                // 审批类型：1 会签，2 或签 [cite: 1]
                'approval_type' => $node['data']['type'] ?? 2,

                // 初始状态逻辑：如果没有前置节点，说明是首节点，直接进入“审批中”状态
                'status'        => $prev ? 0 : 1,

                'handled_time'  => 0,
                'crt_time'      => time(),
                'upd_time'      => time(),
                'crt_id'        => $user['id'],
                'top_depart_id' => $user['top_depart_id']
            ];
        }

        // 4. 写入节点实例表
        WorkFlowInstancesNodes::insert($insertNodes);

        return [true, $instance->id];
    }

    /**
     * 获取当前用户的待办审核列表
     */
    public function getMyPendingApprovals($userId, $topDepartId)
    {
        // 1. 在节点实例表中查询
        // 条件：公司隔离 + 状态为审批中(1) + 审批人JSON中包含当前用户ID
        $pendingNodes = WorkFlowInstancesNodes::where('top_depart_id', $topDepartId)
            ->where('status', 1) // 1 = 审批中
            ->whereRaw('JSON_CONTAINS(assignees, JSON_OBJECT("id", ?))', [$userId])
            ->get();

        if ($pendingNodes->isEmpty()) {
            return [];
        }

        // 2. 获取关联的实例信息和业务单据信息
        // 建议在 Model 中定义好 belongsTo 关系
        $instanceIds = $pendingNodes->pluck('instance_id')->unique();

        $instances = WorkFlowInstances::with(['template']) // 关联查出模板名称等信息
        ->whereIn('id', $instanceIds)
            ->get()
            ->keyBy('id');

        // 3. 组装返回数据
        $result = $pendingNodes->map(function ($node) use ($instances) {
            $instance = $instances[$node->instance_id] ?? null;

            return [
                'node_instance_id' => $node->id,        // 节点实例ID（审批接口要用）
                'instance_id'      => $node->instance_id, // 流程实例ID
                'node_label'       => $node->label,       // 当前环节名称（如：财务审批）
                'document_id'      => $instance->document_id ?? 0,   // 业务单据ID
                'document_type'    => $instance->document_type ?? '', // 业务模型
                'flow_title'       => $instance->template->title ?? '未知流程',
                'apply_time'       => $instance->crt_time ?? 0,       // 发起时间
                'approval_type'    => $node->approval_type,           // 1会签/2或签
            ];
        });

        return $result;
    }
}