<?php

namespace App\Filament\Pages;

use App\Services\QuestionServiceApi;
use App\Services\KnowledgeGraphService;
use App\Services\QuestionBankService;
use BackedEnum;
use Filament\Notifications\Notification;
use Filament\Pages\Page;
use UnitEnum;
use Livewire\Attributes\Computed;

class QuestionManagement extends Page
{

    protected static ?string $title = '题库管理';
    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-document-text';
    protected static ?string $navigationLabel = '题库管理';
    protected static string|UnitEnum|null $navigationGroup = '题库系统';
    protected static ?int $navigationSort = 2;
    protected string $view = 'filament.pages.question-management-simple';

    public ?string $search = null;
    public ?string $selectedKpCode = null;
    public ?string $selectedDifficulty = null;
    public ?string $selectedType = null;
    public int $currentPage = 1;
    public int $perPage = 25;

    public ?string $generateKpCode = null;
    public array $selectedSkills = [];
    public int $questionCount = 100;
    public ?string $generateDifficulty = null;
    public ?string $generateType = null;
    public ?string $promptTemplate = null;
    public bool $showGenerateModal = false;
    public bool $showPromptModal = false;

    public ?string $currentTaskId = null;
    public int $currentTaskProgress = 0;
    public ?string $currentTaskMessage = null;
    public bool $isGenerating = false;

    #[Computed(cache: false)]
    public function questions(): array
    {
        $service = app(QuestionServiceApi::class);
        $filters = array_filter([
            'kp_code' => $this->selectedKpCode,
            'difficulty' => $this->selectedDifficulty,
            'type' => $this->selectedType,
            'search' => $this->search,
        ], fn ($value) => filled($value));

        $response = $service->listQuestions($this->currentPage, $this->perPage, $filters);
        return $response['data'] ?? [];
    }

    #[Computed(cache: false)]
    public function meta(): array
    {
        $service = app(QuestionServiceApi::class);
        $filters = array_filter([
            'kp_code' => $this->selectedKpCode,
            'difficulty' => $this->selectedDifficulty,
            'type' => $this->selectedType,
            'search' => $this->search,
        ], fn ($value) => filled($value));

        $response = $service->listQuestions($this->currentPage, $this->perPage, $filters);
        return $response['meta'] ?? ['page' => 1, 'per_page' => 25, 'total' => 0, 'total_pages' => 0];
    }

    #[Computed(cache: false)]
    public function statistics(): array
    {
        return app(QuestionServiceApi::class)->getStatistics();
    }

    #[Computed(cache: false)]
    public function knowledgePointOptions(): array
    {
        return app(QuestionServiceApi::class)->getKnowledgePointOptions();
    }

    #[Computed(cache: false)]
    public function skillsOptions(): array
    {
        if (!$this->generateKpCode) {
            return [];
        }

        $service = app(KnowledgeGraphService::class);
        return $service->getSkillsByKnowledgePoint($this->generateKpCode);
    }

    #[Computed(cache: false)]
    public function questionTypeOptions(): array
    {
        return [
            'CHOICE' => '单选题',
            'MULTIPLE_CHOICE' => '多选题',
            'FILL_IN_THE_BLANK' => '填空题',
            'CALCULATION' => '计算题',
            'WORD_PROBLEM' => '应用题',
            'PROOF' => '证明题',
        ];
    }

    public function openGenerateModal(): void
    {
        $this->showGenerateModal = true;
    }

    public function closeGenerateModal(): void
    {
        $this->showGenerateModal = false;
        $this->reset(['generateKpCode', 'selectedSkills', 'questionCount', 'generateDifficulty', 'generateType']);
        $this->isGenerating = false;
        $this->currentTaskId = null;
        $this->currentTaskProgress = 0;
        $this->currentTaskMessage = null;
    }

    public function updatedGenerateKpCode(): void
    {
        // 选择新知识点时重置技能选择
        $this->selectedSkills = [];
    }

    public function toggleAllSkills(): void
    {
        $skills = $this->skillsOptions;
        if (count($this->selectedSkills) === count($skills)) {
            $this->selectedSkills = [];
        } else {
            $this->selectedSkills = array_column($skills, 'code');
        }
    }

    public function executeGenerate(): void
    {
        // 防止重复提交
        if ($this->isGenerating) {
            return;
        }

        // ✅ 立即关闭弹窗，无论验证结果如何
        $this->showGenerateModal = false;

        // 验证参数
        if (!$this->generateKpCode) {
            Notification::make()->title('请选择知识点')->danger()->send();
            return;
        }

        if (empty($this->selectedSkills)) {
            Notification::make()->title('请选择至少一个技能')->danger()->send();
            return;
        }

        // 设置异步生成状态
        $this->isGenerating = true;
        $this->currentTaskId = null;

        try {
            $service = app(QuestionBankService::class);
            $callbackUrl = route('api.questions.callback');

            \Log::info("[QuestionGen] 开始生成，callback URL: " . $callbackUrl);

            $result = $service->generateIntelligentQuestions([
                'kp_code' => $this->generateKpCode,
                'skills' => $this->selectedSkills,
                'count' => $this->questionCount,
                'difficulty' => $this->generateDifficulty,
                'type' => $this->generateType,
                'prompt_template' => $this->promptTemplate ?? null
            ], $callbackUrl);

            if ($result['success'] ?? false) {
                $this->currentTaskId = $result['task_id'] ?? null;

                \Log::info("[QuestionGen] 任务已创建: {$this->currentTaskId}，启动前端监控");

                Notification::make()
                    ->title('正在生成题目')
                    ->body("任务 ID: {$this->currentTaskId}\nAI正在后台生成，预计需要30-60秒...")
                    ->info()
                    ->persistent()
                    ->send();

                // 开始异步轮询检查任务状态
                $this->dispatch('start-async-task-monitoring');
            } else {
                $this->isGenerating = false;
                Notification::make()
                    ->title('创建任务失败')
                    ->body($result['message'] ?? '未知错误')
                    ->danger()
                    ->send();
            }
        } catch (\Exception $e) {
            $this->isGenerating = false;
            \Log::error("[QuestionGen] 生成异常: " . $e->getMessage());
            Notification::make()
                ->title('生成异常')
                ->body($e->getMessage())
                ->danger()
                ->send();
        }
    }

    // ✅ 已移除轮询机制 - 现在使用 Laravel 广播事件
    // 事件监听在前端 JavaScript 中直接处理，无需后端轮询

    public function forceCloseStatusBar(string $taskId): void
    {
        \Log::info("[QuestionGen] 强制关闭状态栏: {$taskId}");
        $this->isGenerating = false;
        $this->currentTaskId = null;

        Notification::make()
            ->title('⚠️ 任务超时')
            ->body('生成任务可能已完成，请刷新页面查看')
            ->warning()
            ->persistent()
            ->send();
    }

    public function deleteQuestion(string $questionCode): void
    {
        try {
            $service = app(QuestionBankService::class);
            $result = $service->deleteQuestion($questionCode);

            if ($result) {
                Notification::make()->title('删除成功')->body("题目 {$questionCode} 已删除")->success()->send();
                $this->dispatch('refresh-page');
            } else {
                Notification::make()->title('删除失败')->body("题目 {$questionCode} 不存在或已被删除")->warning()->send();
            }
        } catch (\Exception $e) {
            Notification::make()->title('删除异常')->body($e->getMessage())->danger()->send();
        }
    }

    public function updatedSearch(): void
    {
        $this->currentPage = 1;
    }

    public function updatedSelectedKpCode(): void
    {
        $this->currentPage = 1;
    }

    public function updatedSelectedDifficulty(): void
    {
        $this->currentPage = 1;
    }

    public function updatedSelectedType(): void
    {
        $this->currentPage = 1;
    }

    public function updatedPerPage(): void
    {
        $this->currentPage = 1;
    }

    public function gotoPage(int $page): void
    {
        $this->currentPage = $page;
    }

    public function previousPage(): void
    {
        if ($this->currentPage > 1) {
            $this->currentPage--;
        }
    }

    public function nextPage(): void
    {
        if ($this->currentPage < ($this->meta['total_pages'] ?? 1)) {
            $this->currentPage++;
        }
    }

    public function getPages(): array
    {
        $totalPages = $this->meta['total_pages'] ?? 1;
        $currentPage = $this->currentPage;
        $pages = [];
        $start = max(1, $currentPage - 2);
        $end = min($totalPages, $currentPage + 2);

        for ($i = $start; $i <= $end; $i++) {
            $pages[] = $i;
        }

        return $pages;
    }
}