<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Demand;
use App\Models\DemandHandleLog;
use App\Models\DictItem;
use App\Models\DictType;
use App\Models\Teacher;
use App\Support\ApiResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class DemandController extends Controller
{
    use ApiResponse;

    public function index(Request $request): JsonResponse
    {
        $query = Demand::query()
            ->with(['teacher.university', 'typeItem', 'statusItem'])
            ->withCount('handleLogs');

        if ($kw = $request->query('keyword')) {
            $query->where(function ($q) use ($kw) {
                $q->where('title', 'like', "%{$kw}%")
                    ->orWhere('contact_name', 'like', "%{$kw}%")
                    ->orWhere('company', 'like', "%{$kw}%")
                    ->orWhere('content', 'like', "%{$kw}%")
                    ->orWhereHas('typeItem', fn ($tq) => $tq->where('label', 'like', "%{$kw}%"));
            });
        }
        if ($request->filled('teacher_id')) {
            $query->where('teacher_id', (int) $request->query('teacher_id'));
        }
        if ($request->filled('type_dict_item_id')) {
            $query->where('type_dict_item_id', (int) $request->query('type_dict_item_id'));
        }
        if ($request->filled('status_dict_item_id')) {
            $query->where('status_dict_item_id', (int) $request->query('status_dict_item_id'));
        }

        $paginator = $query
            ->orderByDesc('submitted_at')
            ->orderByDesc('id')
            ->paginate((int) $request->query('page_size', 20))
            ->withQueryString();

        $paginator->getCollection()->transform(fn (Demand $d) => $this->serializeList($d));

        return $this->paginated($paginator);
    }

    public function store(Request $request): JsonResponse
    {
        $data = $this->validatedDemand($request);
        $teacher = null;
        if (! empty($data['teacher_id'])) {
            $teacher = Teacher::query()->with('university')->findOrFail($data['teacher_id']);
        }

        $row = Demand::query()->create([
            'teacher_id' => $data['teacher_id'] ?? null,
            'type_dict_item_id' => $data['type_dict_item_id'],
            'status_dict_item_id' => $data['status_dict_item_id'],
            'title' => $data['title'],
            'content' => $data['content'],
            'contact_name' => $data['contact_name'] ?? $teacher?->name,
            'company' => $data['company'] ?? $teacher?->university?->name,
            'submitted_at' => now(),
        ]);

        return $this->ok(['id' => $row->id], '已发布需求');
    }

    public function show(int $demand): JsonResponse
    {
        $model = Demand::query()
            ->with(['teacher.university', 'typeItem', 'statusItem'])
            ->withCount('handleLogs')
            ->findOrFail($demand);

        return $this->ok($this->serializeDetail($model));
    }

    public function update(Request $request, int $demand): JsonResponse
    {
        $model = Demand::query()->findOrFail($demand);
        $data = $this->validatedDemand($request, partial: true);
        $model->fill($data);
        $model->save();

        return $this->ok(null, '已保存');
    }

    public function destroy(int $demand): JsonResponse
    {
        Demand::query()->findOrFail($demand)->delete();

        return $this->ok(null, '已删除');
    }

    public function handleLogs(int $demand): JsonResponse
    {
        Demand::query()->findOrFail($demand);

        $items = DemandHandleLog::query()
            ->with(['adminUser', 'statusItem'])
            ->where('demand_id', $demand)
            ->orderByDesc('handled_at')
            ->orderByDesc('id')
            ->get()
            ->map(fn (DemandHandleLog $log) => $this->serializeHandleLog($log));

        return $this->ok(['items' => $items]);
    }

    public function storeHandleLog(Request $request, int $demand): JsonResponse
    {
        $model = Demand::query()->findOrFail($demand);
        $statusTypeId = DictType::query()->where('code', 'demand_status')->where('status', 1)->value('id');

        $data = $request->validate([
            'handled_at' => ['required', 'date'],
            'admin_user_id' => ['nullable', 'integer', 'exists:admin_users,id'],
            'status_dict_item_id' => $this->dictItemRules($statusTypeId, 'required'),
            'content' => ['required', 'string'],
            'next_plan' => ['nullable', 'string', 'max:255'],
            'next_follow_date' => ['nullable', 'date'],
        ]);

        $log = DemandHandleLog::query()->create([
            'demand_id' => $model->id,
            'admin_user_id' => $data['admin_user_id'] ?? $request->user()?->id,
            'status_dict_item_id' => $data['status_dict_item_id'],
            'content' => $data['content'],
            'next_plan' => $data['next_plan'] ?? null,
            'next_follow_date' => $data['next_follow_date'] ?? null,
            'handled_at' => $data['handled_at'],
        ]);

        $model->status_dict_item_id = $data['status_dict_item_id'];
        $model->save();

        return $this->ok(['id' => $log->id], '已保存跟进');
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedDemand(Request $request, bool $partial = false): array
    {
        $typeTypeId = DictType::query()->where('code', 'demand_type')->where('status', 1)->value('id');
        $statusTypeId = DictType::query()->where('code', 'demand_status')->where('status', 1)->value('id');

        if (! $partial && (! $typeTypeId || ! $statusTypeId)) {
            throw new \Illuminate\Http\Exceptions\HttpResponseException(
                response()->json([
                    'message' => '需求字典未配置，请执行 DemandDictionarySeeder',
                    'data' => null,
                ], 422)
            );
        }

        $activeStatusId = $statusTypeId
            ? DictItem::query()->where('dict_type_id', $statusTypeId)->where('value', 'active')->where('status', 1)->value('id')
            : null;

        $rules = [
            'teacher_id' => ['nullable', 'integer', 'exists:teachers,id'],
            'type_dict_item_id' => $this->dictItemRules($typeTypeId, $partial ? 'sometimes' : 'required'),
            'status_dict_item_id' => $this->dictItemRules($statusTypeId, $partial ? 'sometimes' : 'nullable'),
            'title' => [$partial ? 'sometimes' : 'required', 'string', 'max:255'],
            'content' => [$partial ? 'sometimes' : 'required', 'string'],
            'contact_name' => ['nullable', 'string', 'max:64'],
            'company' => ['nullable', 'string', 'max:128'],
        ];

        $data = $request->validate($rules);

        if (! $partial && empty($data['status_dict_item_id']) && $activeStatusId) {
            $data['status_dict_item_id'] = $activeStatusId;
        }

        return $data;
    }

    /**
     * @return array<int, \Illuminate\Contracts\Validation\Rule|string>
     */
    protected function dictItemRules(?int $dictTypeId, string $presence): array
    {
        if (! $dictTypeId) {
            return match ($presence) {
                'required' => ['required', 'integer'],
                'sometimes' => ['sometimes', 'nullable', 'integer'],
                default => ['nullable', 'integer'],
            };
        }

        $exists = Rule::exists('dict_items', 'id')->where(
            fn ($q) => $q->where('dict_type_id', $dictTypeId)->where('status', 1)
        );

        return match ($presence) {
            'required' => ['required', 'integer', $exists],
            'sometimes' => ['sometimes', 'nullable', 'integer', $exists],
            default => ['nullable', 'integer', $exists],
        };
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeList(Demand $d): array
    {
        return [
            'id' => $d->id,
            'teacher_id' => $d->teacher_id,
            'teacher_name' => $d->teacher?->name,
            'type_dict_item_id' => $d->type_dict_item_id,
            'type_item' => $this->serializeDictItem($d->typeItem),
            'status_dict_item_id' => $d->status_dict_item_id,
            'status_item' => $this->serializeDictItem($d->statusItem),
            'title' => $d->title,
            'content' => $d->content,
            'contact_name' => $d->contact_name,
            'company' => $d->company,
            'submitted_at' => $d->submitted_at?->toDateString(),
            'handle_logs_count' => (int) ($d->handle_logs_count ?? 0),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeDetail(Demand $d): array
    {
        $row = $this->serializeList($d);
        $row['university_name'] = $d->teacher?->university?->name;

        return $row;
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeHandleLog(DemandHandleLog $log): array
    {
        return [
            'id' => $log->id,
            'handled_at' => $log->handled_at?->toDateString(),
            'operator_name' => $log->adminUser?->real_name ?: $log->adminUser?->username,
            'status_item' => $this->serializeDictItem($log->statusItem),
            'content' => $log->content,
            'next_plan' => $log->next_plan,
            'next_follow_date' => $log->next_follow_date?->toDateString(),
        ];
    }

    /**
     * @return array{id:int,label:string,value:string}|null
     */
    protected function serializeDictItem(?DictItem $item): ?array
    {
        if (! $item) {
            return null;
        }

        return [
            'id' => $item->id,
            'label' => $item->label,
            'value' => $item->value,
        ];
    }
}