<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\ActivitySignup;
use App\Models\CourseSignup;
use App\Models\DictItem;
use App\Models\DictType;
use App\Models\MiniappUser;
use App\Models\Teacher;
use App\Services\GridMemberScopeService;
use App\Services\TeacherFollowPlanService;
use App\Support\ApiResponse;
use Carbon\Carbon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;

class MiniappUserController extends Controller
{
    use ApiResponse;

    public function __construct(
        protected TeacherFollowPlanService $followPlan,
        protected GridMemberScopeService $gridScope
    ) {}

    public function index(Request $request): JsonResponse
    {
        $query = MiniappUser::query()->with([
            'teacher:id,name',
            'researchDirections:id,name,sort',
        ]);

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

        if ($request->query('converted') === '1') {
            $query->whereNotNull('teacher_id');
        } elseif ($request->query('converted') === '0') {
            $query->whereNull('teacher_id');
        }

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

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

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

    public function show(int $miniappUser): JsonResponse
    {
        $model = MiniappUser::query()->with([
            'teacher:id,name',
            'researchDirections:id,name,sort',
        ])->findOrFail($miniappUser);

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

    public function convertToTeacher(Request $request, int $miniappUser): JsonResponse
    {
        $user = $this->gridScope->userFromRequest($request);
        $this->gridScope->assertCanMutateTeachers($user);

        $miniapp = MiniappUser::query()
            ->with('researchDirections:id')
            ->findOrFail($miniappUser);
        if ($miniapp->teacher_id) {
            return $this->fail('该学员已转入老师库', 422);
        }

        $this->ensureTeacherDicts();
        $data = $this->validatedConvertTeacher($request);
        $this->gridScope->assertTeacherDataInScope($user, $data);

        $directionIds = $data['research_direction_ids'] ?? [];
        unset($data['research_direction_ids']);
        if ($directionIds === []) {
            $directionIds = $miniapp->researchDirections->pluck('id')->all();
        }
        if ($directionIds === []) {
            return $this->fail('请填写研究方向', 422);
        }

        $sourceTypeId = DictType::query()->where('code', 'teacher_source')->where('status', 1)->value('id');
        $miniappSourceId = DictItem::query()
            ->where('dict_type_id', $sourceTypeId)
            ->where('value', 'miniapp')
            ->where('status', 1)
            ->value('id');

        if ($miniappSourceId) {
            $data['source_dict_item_id'] = $miniappSourceId;
        }

        if (empty($data['phone']) && $miniapp->mobile) {
            $data['phone'] = $miniapp->mobile;
        }
        if (empty($data['title']) && $miniapp->job_title) {
            $data['title'] = $miniapp->job_title;
        }

        $teacherId = DB::transaction(function () use ($miniapp, $data, $directionIds, $request) {
            $teacher = new Teacher($data);
            $teacher->miniapp_user_id = $miniapp->id;
            $this->syncPartnerFlags($teacher, $data);
            $this->applyStarFollowDate($teacher, $request->boolean('recalc_next_follow_date', true));
            $teacher->save();
            $teacher->researchDirections()->sync($directionIds);

            $miniapp->teacher_id = $teacher->id;
            $miniapp->converted_at = now();
            $miniapp->save();

            $this->linkSignupsToMiniappUser($miniapp);

            return $teacher->id;
        });

        return $this->ok(['teacher_id' => $teacherId], '已转入老师库');
    }

    protected function linkSignupsToMiniappUser(MiniappUser $miniapp): void
    {
        if (! $miniapp->mobile) {
            return;
        }

        CourseSignup::query()
            ->where(function ($q) use ($miniapp) {
                $q->where('miniapp_user_id', $miniapp->id)
                    ->orWhere(function ($q2) use ($miniapp) {
                        $q2->whereNull('miniapp_user_id')->where('mobile', $miniapp->mobile);
                    });
            })
            ->update(['miniapp_user_id' => $miniapp->id]);

        ActivitySignup::query()
            ->where(function ($q) use ($miniapp) {
                $q->where('miniapp_user_id', $miniapp->id)
                    ->orWhere(function ($q2) use ($miniapp) {
                        $q2->whereNull('miniapp_user_id')->where('mobile', $miniapp->mobile);
                    });
            })
            ->update(['miniapp_user_id' => $miniapp->id]);
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedConvertTeacher(Request $request): array
    {
        $sourceTypeId = DictType::query()->where('code', 'teacher_source')->where('status', 1)->value('id');
        $levelTypeId = DictType::query()->where('code', 'teacher_level')->where('status', 1)->value('id');
        $statusTypeId = DictType::query()->where('code', 'teacher_status')->where('status', 1)->value('id');

        $rules = [
            'name' => ['required', 'string', 'max:64'],
            'university_id' => ['required', 'integer', 'exists:universities,id'],
            'city' => ['required', 'string', 'max:64'],
            'title' => ['required', 'string', 'max:64'],
            'research_direction_ids' => ['required', 'array', 'min:1'],
            'research_direction_ids.*' => ['integer', 'distinct', Rule::exists('research_directions', 'id')->where('status', 1)],
            'phone' => ['nullable', 'string', 'max:32'],
            'email' => ['nullable', 'email', 'max:128'],
            'source_dict_item_id' => $this->dictItemRules($sourceTypeId, 'nullable'),
            'star_level_dict_item_id' => $this->dictItemRules($levelTypeId, 'nullable'),
            'status_dict_item_id' => $this->dictItemRules($statusTypeId, 'required'),
            'next_follow_date' => ['nullable', 'date'],
            'next_follow_subject' => ['nullable', 'string', 'max:255'],
            'remark' => ['nullable', 'string'],
            'recalc_next_follow_date' => ['nullable', 'boolean'],
        ];

        return $request->validate($rules);
    }

    /**
     * @param  array<string, mixed>  $data
     */
    protected function syncPartnerFlags(Teacher $teacher, array $data): void
    {
        if (! array_key_exists('status_dict_item_id', $data)) {
            return;
        }

        $statusItem = DictItem::query()->find($data['status_dict_item_id']);
        if ($statusItem && $statusItem->value === 'partner') {
            $teacher->is_partner = true;
            $teacher->converted_at = $teacher->converted_at ?? now();
        }
    }

    protected function applyStarFollowDate(Teacher $teacher, bool $recalc): void
    {
        if (! $recalc || ! $teacher->star_level_dict_item_id) {
            return;
        }

        $starItem = DictItem::query()->find($teacher->star_level_dict_item_id);
        $teacher->next_follow_date = $this->followPlan->nextFollowDateFromStar($starItem);
    }

    protected function ensureTeacherDicts(): void
    {
        $codes = ['teacher_source', 'teacher_level', 'teacher_status'];
        foreach ($codes as $code) {
            if (! DictType::query()->where('code', $code)->where('status', 1)->exists()) {
                throw new \Illuminate\Http\Exceptions\HttpResponseException(
                    response()->json([
                        'message' => '老师库字典未配置，请执行 TeacherDictionarySeeder',
                        'data' => null,
                    ], 422)
                );
            }
        }
    }

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

    /**
     * @return array<string, mixed>
     */
    protected function serializeList(MiniappUser $u): array
    {
        $enrollments = $this->loadEnrollments($u);

        return [
            'id' => $u->id,
            'name' => $u->name,
            'mobile' => $u->mobile,
            'company' => $u->company,
            'nickname' => $u->nickname,
            'avatar_url' => $u->avatar_url,
            'job_title' => $u->job_title,
            'research_direction' => $u->researchDirections->pluck('name')->join('、') ?: null,
            'research_direction_ids' => $u->researchDirections->pluck('id')->values()->all(),
            'teacher_id' => $u->teacher_id,
            'teacher_name' => $u->teacher?->name,
            'converted_at' => $u->converted_at?->toIso8601String(),
            'course_titles' => $enrollments['course_titles'],
            'activity_titles' => $enrollments['activity_titles'],
            'created_at' => $u->created_at?->toIso8601String(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeDetail(MiniappUser $u): array
    {
        $row = $this->serializeList($u);
        $enrollments = $this->loadEnrollments($u, detailed: true);
        $row['courses'] = $enrollments['courses'];
        $row['activities'] = $enrollments['activities'];

        return $row;
    }

    /**
     * @return array{course_titles: array<int, string>, activity_titles: array<int, string>, courses: array<int, array<string, mixed>>, activities: array<int, array<string, mixed>>}
     */
    protected function loadEnrollments(MiniappUser $u, bool $detailed = false): array
    {
        $courseQuery = CourseSignup::query()
            ->with('course:id,title')
            ->where(function ($q) use ($u) {
                $q->where('miniapp_user_id', $u->id);
                if ($u->mobile) {
                    $q->orWhere(function ($q2) use ($u) {
                        $q2->whereNull('miniapp_user_id')->where('mobile', $u->mobile);
                    });
                }
            })
            ->orderByDesc('signed_up_at')
            ->orderByDesc('id');

        $activityQuery = ActivitySignup::query()
            ->with('activity:id,title')
            ->where(function ($q) use ($u) {
                $q->where('miniapp_user_id', $u->id);
                if ($u->mobile) {
                    $q->orWhere(function ($q2) use ($u) {
                        $q2->whereNull('miniapp_user_id')->where('mobile', $u->mobile);
                    });
                }
            })
            ->orderByDesc('signed_up_at')
            ->orderByDesc('id');

        $courseSignups = $courseQuery->get();
        $activitySignups = $activityQuery->get();

        $courseTitles = $courseSignups->map(fn ($s) => $s->course?->title)->filter()->unique()->values()->all();
        $activityTitles = $activitySignups->map(fn ($s) => $s->activity?->title)->filter()->unique()->values()->all();

        $result = [
            'course_titles' => $courseTitles,
            'activity_titles' => $activityTitles,
            'courses' => [],
            'activities' => [],
        ];

        if ($detailed) {
            $result['courses'] = $courseSignups->map(fn (CourseSignup $s) => [
                'id' => $s->id,
                'course_id' => $s->course_id,
                'title' => $s->course?->title,
                'signed_up_at' => $s->signed_up_at?->toDateString(),
                'company' => $s->company,
            ])->values()->all();

            $result['activities'] = $activitySignups->map(fn (ActivitySignup $s) => [
                'id' => $s->id,
                'activity_id' => $s->activity_id,
                'title' => $s->activity?->title,
                'signed_up_at' => $s->signed_up_at?->toDateString(),
                'company' => $s->company,
            ])->values()->all();
        }

        return $result;
    }
}