<?php

namespace App\Filament\Pages;

use App\Services\QuestionBulkImportService;
use BackedEnum;
use Filament\Forms;
use Filament\Notifications\Notification;
use Filament\Pages\Page;
use Filament\Schemas\Components\Section;
use Filament\Schemas\Schema;
use Filament\Support\Enums\Width;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;
use UnitEnum;

class QuestionsJsonImportPage extends Page implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;

    /**
     * 主入口在「待入库质检」页右侧；本页仅保留直达 URL，不出现在侧栏。
     */
    protected static bool $shouldRegisterNavigation = false;

    protected static ?string $title = '题库 JSON 一键导入';

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-arrow-up-tray';

    protected static ?string $navigationLabel = 'JSON 一键导入';

    protected static string|UnitEnum|null $navigationGroup = '题库管理';

    protected static ?int $navigationSort = 6;

    /**
     * 固定路径，便于收藏与文档：/admin/questions-json-import
     */
    protected static ?string $slug = 'questions-json-import';

    protected Width|string|null $maxContentWidth = Width::Full;

    protected string $view = 'filament.pages.questions-json-import';

    /** @var array<string, mixed> */
    public array $data = [
        'dry_run' => false,
        'sql_only' => false,
        'with_id' => false,
    ];

    public ?string $lastSqlPath = null;

    public ?string $lastMessage = null;

    public function mount(): void
    {
        $this->form->fill($this->data);
    }

    public function form(Schema $schema): Schema
    {
        return $schema
            ->schema([
                Section::make('从 JSON 导入 questions')
                    ->description('支持整段 JSON 数组或 NDJSON（每行一题）。左侧选文件与选项，右侧点击「一键导入」执行。')
                    ->schema([
                        Forms\Components\FileUpload::make('json_file')
                            ->label('JSON 文件')
                            ->disk('local')
                            ->directory('imports/questions')
                            ->acceptedFileTypes(['application/json', 'text/plain', 'text/json'])
                            ->maxSize(51200)
                            ->helperText('最大约 50MB；字段含 question_code、kp_code、stem、options、answer、solution 等'),
                        Forms\Components\Toggle::make('dry_run')
                            ->label('仅校验（dry-run，不写库）')
                            ->default(false),
                        Forms\Components\Toggle::make('sql_only')
                            ->label('仅生成 SQL（不写入本地 questions）')
                            ->default(false),
                        Forms\Components\Toggle::make('with_id')
                            ->label('SQL 中含 id（仅当目标库必须对齐原主键时勾选；默认不含 id）')
                            ->default(false),
                    ])
                    ->columns(1),
            ])
            ->statePath('data');
    }

    public function runImport(): void
    {
        $this->lastMessage = null;
        $this->lastSqlPath = null;

        $data = $this->data;
        $relative = $data['json_file'] ?? null;
        if (! is_string($relative) || $relative === '') {
            Notification::make()->title('请选择 JSON 文件')->warning()->send();

            return;
        }

        $fullPath = Storage::disk('local')->path($relative);
        if (! File::isFile($fullPath)) {
            Notification::make()->title('文件不存在')->body($fullPath)->danger()->send();

            return;
        }

        $dryRun = (bool) ($data['dry_run'] ?? false);
        $sqlOnly = (bool) ($data['sql_only'] ?? false);
        $withId = (bool) ($data['with_id'] ?? false);

        $service = app(QuestionBulkImportService::class);
        $pipeline = $service->runImportPipeline($fullPath, $dryRun, $sqlOnly, $withId);

        if (! $pipeline['ok']) {
            Notification::make()->title('导入失败')->body($pipeline['error'] ?? '')->danger()->send();

            return;
        }

        $this->lastSqlPath = $pipeline['sql_path'] ?? null;
        $this->lastMessage = $pipeline['message'] ?? null;

        if ($sqlOnly) {
            Notification::make()->title('SQL 已生成')->body($this->lastSqlPath ?? '')->success()->send();

            return;
        }

        $body = (string) $this->lastMessage;
        $stats = $pipeline['stats'] ?? null;
        if (is_array($stats) && $stats['errors'] !== []) {
            $body .= "\n".implode("\n", array_slice($stats['errors'], 0, 8));
            if (count($stats['errors']) > 8) {
                $body .= "\n… 另有 ".(count($stats['errors']) - 8).' 条错误';
            }
        }

        Notification::make()
            ->title($dryRun ? '校验完成（dry-run）' : '导入完成')
            ->body($body)
            ->success()
            ->send();
    }
}