<?php

namespace App\Services;

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

class MistakeBookService
{
    protected string $learningAnalyticsBase;
    protected string $questionBankBase;
    protected int $timeout;

    public function __construct(
        ?string $learningAnalyticsBase = null,
        ?string $questionBankBase = null,
        ?int $timeout = null
    ) {
        $this->learningAnalyticsBase = rtrim(
            $learningAnalyticsBase
                ?: config('services.learning_analytics.url', env('LEARNING_ANALYTICS_API_BASE', 'http://localhost:5016')),
            '/'
        );

        $this->questionBankBase = rtrim(
            $questionBankBase
                ?: config('services.question_bank.base_url', env('QUESTION_BANK_API_BASE', 'http://localhost:5015')),
            '/'
        );

        $this->timeout = $timeout ?? (int) config('services.learning_analytics.timeout', 20);
    }

    /**
     * 获取错题列表（支持多维筛选）
     */
    public function listMistakes(array $params = []): array
    {
        $query = array_filter([
            'student_id' => $params['student_id'] ?? null,
            'kp_ids' => $this->implodeIfArray($params['kp_ids'] ?? null),
            'skill_ids' => $this->implodeIfArray($params['skill_ids'] ?? null),
            'error_types' => $this->implodeIfArray($params['error_types'] ?? null),
            'time_range' => $params['time_range'] ?? null,
            'start_date' => $params['start_date'] ?? null,
            'end_date' => $params['end_date'] ?? null,
            'page' => $params['page'] ?? 1,
            'per_page' => $params['per_page'] ?? 20,
        ], fn ($value) => filled($value));

        try {
            $response = Http::timeout($this->timeout)
                ->get($this->learningAnalyticsBase . '/api/mistake-book', $query);

            if ($response->successful()) {
                info("MistakeBookService::listMistakes", [$response->json()]);
                $body = $response->json();
                return is_array($body) ? $body : ['data' => $body];
            }

            Log::warning('MistakeBook list failed', [
                'status' => $response->status(),
                'body' => $response->body(),
                'query' => $query,
            ]);
        } catch (\Throwable $e) {
            Log::error('MistakeBook list exception', [
                'error' => $e->getMessage(),
                'query' => $query,
            ]);
        }

        return [
            'data' => [],
            'meta' => ['total' => 0, 'page' => 1, 'per_page' => $query['per_page'] ?? 20],
        ];
    }

    /**
     * 获取单条错题详情（可选带学生ID保证隔离）
     */
    public function getMistakeDetail(string $mistakeId, ?string $studentId = null): array
    {
        $query = array_filter([
            'student_id' => $studentId,
        ], fn ($value) => filled($value));

        try {
            $response = Http::timeout($this->timeout)
                ->get($this->learningAnalyticsBase . '/api/mistake-book/' . $mistakeId, $query);

            if ($response->successful()) {
                $body = $response->json();
                return is_array($body) ? $body : [];
            }

            Log::warning('Mistake detail request failed', [
                'mistake_id' => $mistakeId,
                'status' => $response->status(),
                'body' => $response->body(),
            ]);

            // 兼容：LearningAnalytics 当前未提供单条详情接口时，从列表中过滤
            if ($studentId) {
                $fallback = $this->listMistakes([
                    'student_id' => $studentId,
                    'per_page' => 100, // 兼容后端限制（<=100）
                ]);

                $matched = collect($fallback['data'] ?? [])->firstWhere('id', (int) $mistakeId);
                if ($matched) {
                    return $matched;
                }
            }
        } catch (\Throwable $e) {
            Log::error('Mistake detail request exception', [
                'mistake_id' => $mistakeId,
                'student_id' => $studentId,
                'error' => $e->getMessage(),
            ]);
        }

        return [];
    }

    /**
     * 获取错题统计概要
     */
    public function summarize(string $studentId): array
    {
        try {
            $response = Http::timeout($this->timeout)
                ->get($this->learningAnalyticsBase . '/api/mistake-book/summary', [
                    'student_id' => $studentId,
                ]);

            if ($response->successful()) {
                $body = $response->json();
                return is_array($body) ? $body : [];
            }

            Log::warning('MistakeBook summary failed', [
                'status' => $response->status(),
                'body' => $response->body(),
                'student_id' => $studentId,
            ]);
        } catch (\Throwable $e) {
            Log::error('MistakeBook summary exception', [
                'student_id' => $studentId,
                'error' => $e->getMessage(),
            ]);
        }

        // fallback 返回一个空结构，避免前端崩溃
        return [
            'total' => 0,
            'this_week' => 0,
            'pending_review' => 0,
            'mastery_rate' => null,
        ];
    }

    /**
     * 获取错误模式与推荐路径
     */
    public function getMistakePatterns(string $studentId): array
    {
        try {
            $response = Http::timeout($this->timeout)
                ->get($this->learningAnalyticsBase . '/api/analytics/mistake-pattern', [
                    'student_id' => $studentId,
                ]);

            if ($response->successful()) {
                $body = $response->json();
                return is_array($body) ? $body : [];
            }

            Log::warning('Mistake pattern request failed', [
                'status' => $response->status(),
                'body' => $response->body(),
                'student_id' => $studentId,
            ]);
        } catch (\Throwable $e) {
            Log::error('Mistake pattern request exception', [
                'student_id' => $studentId,
                'error' => $e->getMessage(),
            ]);
        }

        return [];
    }

    /**
     * 收藏/取消收藏错题
     */
    public function toggleFavorite(string $mistakeId, bool $favorite = true): bool
    {
        try {
            $response = Http::timeout($this->timeout)
                ->post($this->learningAnalyticsBase . '/api/mistake-book/' . $mistakeId . '/favorite', [
                    'favorite' => $favorite,
                ]);

            return $response->successful();
        } catch (\Throwable $e) {
            Log::error('Toggle favorite failed', [
                'mistake_id' => $mistakeId,
                'favorite' => $favorite,
                'error' => $e->getMessage(),
            ]);
        }

        return false;
    }

    /**
     * 标记已复习
     */
    public function markReviewed(string $mistakeId): bool
    {
        try {
            $response = Http::timeout($this->timeout)
                ->post($this->learningAnalyticsBase . '/api/mistake-book/' . $mistakeId . '/review');

            return $response->successful();
        } catch (\Throwable $e) {
            Log::error('Mark reviewed failed', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);
        }

        return false;
    }

    /**
     * 添加到重练清单
     */
    public function addToRetryList(string $mistakeId): bool
    {
        try {
            $response = Http::timeout($this->timeout)
                ->post($this->learningAnalyticsBase . '/api/mistake-book/' . $mistakeId . '/retry-list');

            return $response->successful();
        } catch (\Throwable $e) {
            Log::error('Add to retry list failed', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);
        }

        return false;
    }

    /**
     * 基于错题推荐练习题
     */
    public function recommendPractice(string $studentId, array $kpIds = [], array $skillIds = []): array
    {
        $payload = array_filter([
            'student_id' => $studentId,
            'kp_ids' => array_values(array_unique($kpIds)),
            'skill_ids' => array_values(array_unique($skillIds)),
        ], fn ($value) => $value !== null);

        try {
            $response = Http::timeout($this->timeout)
                ->post($this->questionBankBase . '/api/questions/recommend', $payload);

            if ($response->successful()) {
                $body = $response->json();
                return is_array($body) ? $body : ['data' => $body];
            }

            Log::warning('Recommend practice failed', [
                'status' => $response->status(),
                'body' => $response->body(),
                'payload' => $payload,
            ]);
        } catch (\Throwable $e) {
            Log::error('Recommend practice exception', [
                'payload' => $payload,
                'error' => $e->getMessage(),
            ]);
        }

        return ['data' => []];
    }

    /**
     * 为学生仪表板提供快照数据
     */
    public function getPanelSnapshot(string $studentId, int $limit = 5): array
    {
        $list = $this->listMistakes([
            'student_id' => $studentId,
            'per_page' => $limit,
        ]);

        $patterns = $this->getMistakePatterns($studentId);
        $summary = $this->summarize($studentId);

        return [
            'recent' => $list['data'] ?? [],
            'weak_skills' => $patterns['top_skills'] ?? [],
            'weak_kps' => $patterns['top_kps'] ?? [],
            'error_types' => $patterns['error_types'] ?? [],
            'recommend_path' => $patterns['recommend_path'] ?? [],
            'stats' => [
                'total' => $summary['total'] ?? Arr::get($list, 'meta.total', 0),
                'this_week' => $summary['this_week'] ?? null,
                'pending_review' => $summary['pending_review'] ?? null,
                'mastery_rate' => $summary['mastery_rate'] ?? null,
            ],
        ];
    }

    private function implodeIfArray($value): ?string
    {
        if (is_array($value)) {
            return implode(',', array_filter($value));
        }

        return $value;
    }

    /**
     * 获取题目的全体正确率（LearningAnalytics 聚合）
     */
    public function getQuestionAccuracy(string $questionId): ?float
    {
        try {
            $response = Http::timeout($this->timeout)
                ->get($this->learningAnalyticsBase . '/api/analytics/question/' . $questionId . '/accuracy');

            if ($response->successful()) {
                $body = $response->json();
                return isset($body['accuracy']) ? floatval($body['accuracy']) : null;
            }
        } catch (\Throwable $e) {
            Log::warning('Get question accuracy failed', [
                'question_id' => $questionId,
                'error' => $e->getMessage(),
            ]);
        }

        return null;
    }
}