<?php

namespace App\Http\Controllers\Api;

use App\Admin\Services\WorkFlowService;
use App\Enums\CheckStatus;
use App\Exceptions\RuntimeException;
use App\Http\Resources\TaskResource;
use App\Http\Resources\WorkflowLogResource;
use App\Models\Task;
use App\Models\TaskHygiene;
use App\Models\TaskLedger;
use App\Models\WorkflowCheck;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\MorphTo;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Http\{Request, Response};
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;

class WorkflowController extends Controller
{
    public function index(Request $request)
    {
        $request->validate([
            'subject_type' => 'required',
        ]);
        $subjectType = $request->input('subject_type');
        $model = Relation::getMorphedModel($subjectType);
        $resource = $this->mapResource($model);

        $user = $request->user();

        $include = ['workflow'];
        if ($request->input('include')) {
            $explodes = explode(',', $request->input('include'));
            $include = array_merge($include, $explodes);
        }

        $query = $model::query()->with($include)
            // ->whereHas('workflow', fn($q) => $q->where('check_status', CheckStatus::Processing))
            ->whereHas('workflow.logs', fn($q) => $q->own($user)->where('check_status', '>', CheckStatus::None->value))
            ->orderBy('created_at', 'desc');

        $list = $query->paginate($request->input('per_page'));

        switch ($model) {
            case TaskHygiene::class:
                $list->loadMissing(['task', 'store']);
                $list->through(function (TaskHygiene $item) {
                    return tap($item->task)->setRelation('taskable', $item->unsetRelation('task'));
                });
                break;
        }

        return $resource::collection($list);
    }

    public function show($id, Request $request)
    {
        $request->validate([
            'subject_type' => 'required',
        ]);

        $user = $request->user();

        $subjectType = $request->input('subject_type');
        $model = Relation::getMorphedModel($subjectType);

        $resource = $this->mapResource($model);

        // 当前用户是否可以审核
        $checkable = false;

        $include = ['workflow'];
        if ($request->input('include')) {
            $explodes = explode(',', $request->input('include'));
            $include = array_merge($include, $explodes);
        }

        switch ($model) {
            case TaskHygiene::class:
                $info = Task::with([
                    'taskable' => function (MorphTo $morphTo) {
                        $morphTo->morphWith([
                            TaskHygiene::class => ['workflow', 'store', 'storeMaster'],
                            TaskLedger::class => ['store', 'storeMaster'],
                        ]);
                    },
                ])->findOrFail($id);
                $info->taskable->setRelation('task', $info->withoutRelations());
                $checkable = $info->taskable->workflow->logs()->own($user)->where('check_status', CheckStatus::Processing)->exists();
                break;

            default:
                $info = $model::query()->with($include)->findOrFail($id);
                $checkable = $info->workflow->logs()->own($user)->where('check_status', CheckStatus::Processing)->exists();
                break;
        }

        return ['data' => $resource::make($info), 'checkable' => $checkable];
    }

    public function logs($id, Request $request)
    {
        $request->validate([
            'subject_type' => 'required',
        ]);
        $subjectType = $request->input('subject_type');
        if ($subjectType == (new TaskHygiene)->getMorphClass()) {
            $task = Task::findOrFail($id);
            $taskable = $task->taskable;
            if (!$taskable) {
                throw new RuntimeException('任务不存在');
            }
            $check = $taskable->workflow;
            if (!$check) {
                throw new RuntimeException('审核记录不存在');
            }
        } else {
            $check = WorkflowCheck::where('subject_type', $subjectType)->where('subject_id', $id)->firstOrFail();
        }
        $logs = $check->logs()->with(['checkUser'])->sort()->get();

        return WorkflowLogResource::collection($logs);
    }

    public function cancel($id, Request $request, WorkFlowService $workFlowService)
    {
        $request->validate([
            'subject_type' => 'required',
        ]);
        $subjectType = $request->input('subject_type');
        if ($subjectType == (new TaskHygiene)->getMorphClass()) {
            $task = Task::findOrFail($id);
            $taskable = $task->taskable;
            if (!$taskable) {
                throw new RuntimeException('任务不存在');
            }
            $check = $taskable->workflow;
            if (!$check) {
                throw new RuntimeException('审核记录不存在');
            }
        } else {
            $check = WorkflowCheck::where('subject_type', $subjectType)->where('subject_id', $id)->firstOrFail();
        }
        try {
            DB::beginTransaction();
            if (!$workFlowService->cancel($check)) {
                throw new RuntimeException($workFlowService->getError());
            }

            DB::commit();
            return response('', Response::HTTP_OK);
        } catch (\Exception $e) {
            DB::rollBack();
            throw new RuntimeException($e->getMessage());
        }
    }

    public function check($id, Request $request, WorkFlowService $workFlowService)
    {
        $request->validate([
            'subject_type' => 'required',
            'status' => ['required'],
            'remarks' => [Rule::requiredIf(fn() => !$request->input('status'))]
        ], [
            'remarks.required_if' => '未通过原因必填',
        ]);
        $subjectType = $request->input('subject_type');
        if ($subjectType == (new TaskHygiene)->getMorphClass()) {
            $task = Task::findOrFail($id);
            $taskable = $task->taskable;
            if (!$taskable) {
                throw new RuntimeException('任务不存在');
            }
            $check = $taskable->workflow;
            if (!$check) {
                throw new RuntimeException('审核记录不存在');
            }
        } else {
            $check = WorkflowCheck::where('subject_type', $subjectType)->where('subject_id', $id)->firstOrFail();
        }
        $user = $this->guard()->user();
        try {
            DB::beginTransaction();
            $log = $check->logs()->where('check_status', CheckStatus::Processing)->first();
            if (!$log) {
                throw new RuntimeException('审核已经完成');
            }
            if (!$workFlowService->check($user, $log, !!$request->input('status'), ['remarks' => $request->input('remarks')])) {
                throw new RuntimeException($workFlowService->getError());
            }

            DB::commit();
            return response('', Response::HTTP_OK);
        } catch (\Exception $e) {
            DB::rollBack();
            throw new RuntimeException($e->getMessage());
        }
    }

    protected function mapResource(string $model)
    {
        $class = match ($model) {
            TaskHygiene::class => TaskResource::class,
            default => 'App\\Http\\Resources\\'.class_basename($model).'Resource',
        };

        if (! class_exists($class)) {
            throw new RuntimeException('未知的 subject_type');
        }

        return $class;
    }
}