<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\AdminUser;
use App\Models\ResearchDirection;
use App\Models\Role;
use App\Models\University;
use App\Support\ApiResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;

class GridMemberController extends Controller
{
    use ApiResponse;

    public function index(Request $request): JsonResponse
    {
        $roleId = Role::query()->where('code', 'grid_member')->value('id');

        $query = AdminUser::query()
            ->with(['roles', 'universities', 'researchDirections'])
            ->when($roleId, fn ($q) => $q->whereHas('roles', fn ($rq) => $rq->where('roles.id', $roleId)));

        if ($kw = $request->query('keyword')) {
            $query->where(function ($q) use ($kw) {
                $q->where('username', 'like', "%{$kw}%")
                    ->orWhere('real_name', 'like', "%{$kw}%")
                    ->orWhere('mobile', 'like', "%{$kw}%");
            });
        }

        if ($request->filled('status')) {
            $query->where('status', (int) $request->query('status'));
        }

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

        $paginator->getCollection()->transform(fn (AdminUser $u) => $this->serializeList($u));

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

    public function show(int $gridMember): JsonResponse
    {
        $user = $this->findGridMember($gridMember);
        $user->load(['roles', 'universities', 'researchDirections']);

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

    public function store(Request $request): JsonResponse
    {
        $data = $request->validate([
            'username' => ['required', 'string', 'max:64', 'unique:admin_users,username'],
            'password' => ['required', 'string', 'min:6', 'max:255'],
            'real_name' => ['nullable', 'string', 'max:64'],
            'mobile' => ['nullable', 'string', 'max:20'],
            'email' => ['nullable', 'email', 'max:128'],
            'status' => ['required', 'integer', 'in:0,1'],
            'university_ids' => ['required', 'array', 'min:1'],
            'university_ids.*' => ['integer', 'exists:universities,id'],
            'research_direction_ids' => ['required', 'array', 'min:1'],
            'research_direction_ids.*' => ['integer', 'exists:research_directions,id'],
        ]);

        $role = Role::query()->where('code', 'grid_member')->first();
        if (! $role) {
            return $this->fail('网格员角色未配置，请执行 SystemExtensionSeeder', 422);
        }

        $admin = DB::transaction(function () use ($data, $role) {
            $admin = AdminUser::query()->create([
                'username' => $data['username'],
                'password_hash' => Hash::make($data['password']),
                'real_name' => $data['real_name'] ?? null,
                'mobile' => $data['mobile'] ?? null,
                'email' => $data['email'] ?? null,
                'status' => (int) $data['status'],
            ]);

            $admin->roles()->sync([$role->id]);
            $this->syncScope($admin, $data['university_ids'], $data['research_direction_ids']);

            return $admin;
        });

        return $this->ok(['id' => $admin->id], '已创建');
    }

    public function update(Request $request, int $gridMember): JsonResponse
    {
        $admin = $this->findGridMember($gridMember);

        $data = $request->validate([
            'real_name' => ['nullable', 'string', 'max:64'],
            'mobile' => ['nullable', 'string', 'max:20'],
            'email' => ['nullable', 'email', 'max:128'],
            'status' => ['sometimes', 'integer', 'in:0,1'],
            'university_ids' => ['sometimes', 'array', 'min:1'],
            'university_ids.*' => ['integer', 'exists:universities,id'],
            'research_direction_ids' => ['sometimes', 'array', 'min:1'],
            'research_direction_ids.*' => ['integer', 'exists:research_directions,id'],
        ]);

        DB::transaction(function () use ($admin, $data) {
            $admin->fill([
                'real_name' => $data['real_name'] ?? $admin->real_name,
                'mobile' => array_key_exists('mobile', $data) ? $data['mobile'] : $admin->mobile,
                'email' => array_key_exists('email', $data) ? $data['email'] : $admin->email,
                'status' => isset($data['status']) ? (int) $data['status'] : $admin->status,
            ]);
            $admin->save();

            if (array_key_exists('university_ids', $data) || array_key_exists('research_direction_ids', $data)) {
                $uniIds = $data['university_ids'] ?? $admin->universities()->pluck('universities.id')->all();
                $dirIds = $data['research_direction_ids'] ?? $admin->researchDirections()->pluck('research_directions.id')->all();
                $this->syncScope($admin, $uniIds, $dirIds);
            }
        });

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

    public function resetPassword(Request $request, int $gridMember): JsonResponse
    {
        $data = $request->validate([
            'password' => ['required', 'string', 'min:6', 'max:255'],
        ]);

        $admin = $this->findGridMember($gridMember);
        $admin->forceFill([
            'password_hash' => Hash::make($data['password']),
        ])->save();

        return $this->ok(null, '密码已重置');
    }

    public function destroy(Request $request, int $gridMember): JsonResponse
    {
        $admin = $this->findGridMember($gridMember);

        if ($admin->id === $request->user()->id) {
            return $this->fail('不能删除当前登录账号', 422);
        }

        $admin->universities()->detach();
        $admin->researchDirections()->detach();
        $admin->roles()->detach();
        $admin->delete();

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

    protected function findGridMember(int $id): AdminUser
    {
        $roleId = Role::query()->where('code', 'grid_member')->value('id');

        return AdminUser::query()
            ->when($roleId, fn ($q) => $q->whereHas('roles', fn ($rq) => $rq->where('roles.id', $roleId)))
            ->findOrFail($id);
    }

    /**
     * @param  array<int>  $universityIds
     * @param  array<int>  $directionIds
     */
    protected function syncScope(AdminUser $admin, array $universityIds, array $directionIds): void
    {
        $uniIds = University::query()->whereIn('id', $universityIds)->where('status', 1)->pluck('id');
        $dirIds = ResearchDirection::query()->whereIn('id', $directionIds)->where('status', 1)->pluck('id');

        $admin->universities()->sync($uniIds);
        $admin->researchDirections()->sync($dirIds);
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeList(AdminUser $u): array
    {
        return [
            'id' => $u->id,
            'username' => $u->username,
            'real_name' => $u->real_name,
            'mobile' => $u->mobile,
            'email' => $u->email,
            'status' => (int) $u->status,
            'universities' => $u->universities->map(fn ($uni) => [
                'id' => $uni->id,
                'name' => $uni->name,
            ])->values()->all(),
            'research_directions' => $u->researchDirections->map(fn ($d) => [
                'id' => $d->id,
                'name' => $d->name,
            ])->values()->all(),
            'created_at' => $u->created_at?->toIso8601String(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeDetail(AdminUser $u): array
    {
        $row = $this->serializeList($u);
        $row['university_ids'] = $u->universities->pluck('id')->values()->all();
        $row['research_direction_ids'] = $u->researchDirections->pluck('id')->values()->all();

        return $row;
    }
}