<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class QuestionBankService
{
    protected string $baseUrl;

    public function __construct()
    {
        // 从配置文件读取base_url
        $this->baseUrl = config('services.question_bank.base_url', env('QUESTION_BANK_API_BASE', 'http://fa.test/api.questions.callback'));
        $this->baseUrl = rtrim($this->baseUrl, '/');
    }

    /**
     * 获取题目列表
     */
    public function listQuestions(int $page = 1, int $perPage = 50, array $filters = []): array
    {
        try {
            $response = Http::timeout(10)
                ->get($this->baseUrl . '/questions', [
                    'page' => $page,
                    'per_page' => $perPage,
                    ...$filters
                ]);

            if ($response->successful()) {
                return $response->json();
            }

            Log::warning('题库API调用失败', [
                'status' => $response->status()
            ]);
        } catch (\Exception $e) {
            Log::error('获取题目列表失败', [
                'error' => $e->getMessage()
            ]);
        }

        return ['data' => [], 'meta' => ['total' => 0]];
    }

    /**
     * 智能生成题目（异步模式）
     */
    public function generateIntelligentQuestions(array $params, ?string $callbackUrl = null): array
    {
        try {
            // 添加回调 URL
            if ($callbackUrl) {
                $params['callback_url'] = $callbackUrl;
            }

            $response = Http::timeout(10)
                ->post($this->baseUrl . '/generate-intelligent-questions', $params);

            if ($response->successful()) {
                return $response->json();
            }

            Log::warning('题目生成API调用失败', [
                'status' => $response->status()
            ]);
        } catch (\Exception $e) {
            Log::error('题目生成异常', [
                'error' => $e->getMessage()
            ]);
        }

        return ['success' => false, 'message' => '生成失败'];
    }

    /**
     * 获取任务状态
     */
    public function getTaskStatus(string $taskId): ?array
    {
        try {
            $response = Http::timeout(10)
                ->get($this->baseUrl . '/tasks/' . $taskId);

            if ($response->successful()) {
                return $response->json();
            }

            Log::warning('获取任务状态失败', [
                'task_id' => $taskId,
                'status' => $response->status()
            ]);
        } catch (\Exception $e) {
            Log::error('获取任务状态异常', [
                'task_id' => $taskId,
                'error' => $e->getMessage()
            ]);
        }

        return null;
    }

    /**
     * 获取任务列表
     */
    public function listTasks(?string $status = null, int $page = 1, int $perPage = 10): array
    {
        try {
            $params = [
                'page' => $page,
                'per_page' => $perPage
            ];

            if ($status) {
                $params['status'] = $status;
            }

            $response = Http::timeout(10)
                ->get($this->baseUrl . '/tasks', $params);

            if ($response->successful()) {
                return $response->json();
            }

            Log::warning('获取任务列表失败', [
                'status' => $response->status()
            ]);
        } catch (\Exception $e) {
            Log::error('获取任务列表异常', [
                'error' => $e->getMessage()
            ]);
        }

        return ['data' => [], 'meta' => ['total' => 0]];
    }

    /**
     * 获取题目统计信息
     */
    public function getStatistics(): array
    {
        try {
            $response = Http::timeout(10)
                ->get($this->baseUrl . '/questions/statistics');

            if ($response->successful()) {
                return $response->json();
            }

            Log::warning('获取题目统计失败', [
                'status' => $response->status()
            ]);
        } catch (\Exception $e) {
            Log::error('获取题目统计异常', [
                'error' => $e->getMessage()
            ]);
        }

        return [
            'total' => 0,
            'by_difficulty' => [],
            'by_kp' => [],
            'by_source' => []
        ];
    }

    /**
     * 根据知识点获取题目
     */
    public function getQuestionsByKpCode(string $kpCode, int $limit = 100): array
    {
        try {
            $response = Http::timeout(10)
                ->get($this->baseUrl . '/questions', [
                    'kp_code' => $kpCode,
                    'limit' => $limit
                ]);

            if ($response->successful()) {
                return $response->json();
            }
        } catch (\Exception $e) {
            Log::error('根据知识点获取题目失败', [
                'kp_code' => $kpCode,
                'error' => $e->getMessage()
            ]);
        }

        return [];
    }

    /**
     * 删除题目
     */
    public function deleteQuestion(string $questionCode): bool
    {
        try {
            $response = Http::timeout(10)
                ->delete($this->baseUrl . "/questions/{$questionCode}");

            // 只有返回204（删除成功）才返回true，404（不存在）返回false
            if ($response->status() === 204) {
                return true;
            }

            if ($response->status() === 404) {
                Log::warning('尝试删除不存在的题目', ['question_code' => $questionCode]);
                return false;
            }

            return false;
        } catch (\Exception $e) {
            Log::error('删除题目失败', [
                'question_code' => $questionCode,
                'error' => $e->getMessage()
            ]);
            return false;
        }
    }

    /**
     * 检查服务健康状态
     */
    public function checkHealth(): bool
    {
        try {
            $response = Http::timeout(5)
                ->get($this->baseUrl . '/health');

            return $response->successful();
        } catch (\Exception $e) {
            Log::error('题库服务健康检查失败', [
                'error' => $e->getMessage()
            ]);
            return false;
        }
    }
}