<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\MistakeBookService;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Log;

class MistakeBookController extends Controller
{
    protected MistakeBookService $mistakeBookService;

    public function __construct(MistakeBookService $mistakeBookService)
    {
        $this->mistakeBookService = $mistakeBookService;
    }

    /**
     * 获取错题列表
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function listMistakes(Request $request): JsonResponse
    {
        try {
            $params = $request->only([
                'student_id',
                'start_time',
                'end_time',
                'kp_ids',
                'skill_ids',
                'error_types',
                'time_range',
                'page',
                'per_page',
                'sort_by'
            ]);

            // 设置默认值
            $params['page'] = (int) ($params['page'] ?? 1);
            $params['per_page'] = (int) ($params['per_page'] ?? 20);
            $params['sort_by'] = $params['sort_by'] ?? 'created_at_desc';

            // 调用服务层获取错题列表
            $result = $this->mistakeBookService->listMistakes($params);

            Log::info('获取错题列表成功', [
                'student_id' => $params['student_id'] ?? 'N/A',
                'page' => $params['page'],
                'per_page' => $params['per_page'],
                'total' => $result['meta']['total'] ?? 0
            ]);

            return response()->json([
                'success' => true,
                'data' => $result['data'] ?? [],
                'meta' => $result['meta'] ?? [],
                'statistics' => $result['statistics'] ?? null
            ]);

        } catch (\Exception $e) {
            Log::error('获取错题列表失败', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
                'params' => $request->all()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取错题列表失败: ' . $e->getMessage(),
                'data' => [],
                'meta' => [
                    'total' => 0,
                    'page' => (int) ($request->get('page', 1)),
                    'per_page' => (int) ($request->get('per_page', 20))
                ]
            ], 500);
        }
    }

    /**
     * 新增错题
     */
    public function addMistake(Request $request): JsonResponse
    {
        // 优先从body获取数据，不使用query params
        $payload = $request->json()->all();
        if (empty($payload)) {
            $payload = $request->all();
        }

        $validator = validator($payload, [
            'student_id' => 'required|string|min:1',
            'question_id' => 'required|string|min:1',
            'my_answer' => 'nullable|string',
            'correct_answer' => 'nullable|string',
            'source' => 'nullable|string|in:exam,homework,test,quiz,other',
            'happened_at' => 'nullable|date',
            'idempotency_key' => 'nullable|string|max:255',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => '参数错误',
                'errors' => $validator->errors()->toArray(),
            ], 422);
        }

        try {
            $validated = $validator->validated();
            $result = $this->mistakeBookService->createMistake($validated);

            return response()->json([
                'success' => true,
                'data' => $result,
                'duplicate' => $result['duplicate'] ?? false,
            ]);
        } catch (\Exception $e) {
            Log::error('新增错题失败', [
                'error' => $e->getMessage(),
                'payload' => $payload,
            ]);

            return response()->json([
                'success' => false,
                'message' => '新增错题失败: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 获取单条错题详情
     *
     * @param string $mistakeId
     * @param Request $request
     * @return JsonResponse
     */
    public function getMistakeDetail(string $mistakeId, Request $request): JsonResponse
    {
        try {
            $studentId = $request->get('student_id');

            $mistake = $this->mistakeBookService->getMistakeDetail($mistakeId, $studentId);

            if (empty($mistake)) {
                return response()->json([
                    'success' => false,
                    'message' => '错题记录不存在'
                ], 404);
            }

            Log::info('获取错题详情成功', [
                'mistake_id' => $mistakeId,
                'student_id' => $studentId ?? 'N/A'
            ]);

            return response()->json([
                'success' => true,
                'data' => $mistake
            ]);

        } catch (\Exception $e) {
            Log::error('获取错题详情失败', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取错题详情失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 获取错题统计概要
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function getSummary(Request $request): JsonResponse
    {
        try {
            $studentId = $request->get('student_id');

            if (!$studentId) {
                return response()->json([
                    'success' => false,
                    'message' => '缺少必要参数：student_id'
                ], 400);
            }

            $startTime = $request->get('start_time');
            $endTime = $request->get('end_time');

            // 构建查询参数
            $params = ['student_id' => $studentId];
            if ($startTime) {
                $params['start_time'] = $startTime;
            }
            if ($endTime) {
                $params['end_time'] = $endTime;
            }

            // 获取错题列表（用于计算统计信息）
            $mistakesResult = $this->mistakeBookService->listMistakes($params);

            // 获取概要统计
            $summary = $this->mistakeBookService->summarize($studentId);

            Log::info('获取错题概要统计成功', [
                'student_id' => $studentId,
                'total_mistakes' => $summary['total'] ?? 0
            ]);

            return response()->json([
                'success' => true,
                'data' => $summary  // ✅ 直接返回统计信息，不嵌套
            ]);

        } catch (\Exception $e) {
            Log::error('获取错题概要统计失败', [
                'student_id' => $request->get('student_id'),
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取错题概要统计失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 获取错误模式分析
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function getMistakePatterns(Request $request): JsonResponse
    {
        try {
            $studentId = $request->get('student_id');

            if (!$studentId) {
                return response()->json([
                    'success' => false,
                    'message' => '缺少必要参数：student_id'
                ], 400);
            }

            $patterns = $this->mistakeBookService->getMistakePatterns($studentId);

            Log::info('获取错误模式分析成功', [
                'student_id' => $studentId,
                'top_kps_count' => count($patterns['top_kps'] ?? [])
            ]);

            return response()->json([
                'success' => true,
                'data' => $patterns
            ]);

        } catch (\Exception $e) {
            Log::error('获取错误模式分析失败', [
                'student_id' => $request->get('student_id'),
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取错误模式分析失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 收藏/取消收藏错题
     *
     * @param string $mistakeId
     * @param Request $request
     * @return JsonResponse
     */
    public function toggleFavorite(string $mistakeId, Request $request): JsonResponse
    {
        try {
            $data = $request->only(['favorite']);
            $favorite = $data['favorite'] ?? true;

            $result = $this->mistakeBookService->toggleFavorite($mistakeId, $favorite);

            Log::info(($favorite ? '收藏' : '取消收藏') . '错题', [
                'mistake_id' => $mistakeId,
                'favorite' => $favorite,
                'result' => $result
            ]);

            return response()->json([
                'success' => $result,
                'message' => $result ? '操作成功' : '操作失败',
                'data' => [
                    'mistake_id' => $mistakeId,
                    'favorite' => $favorite
                ]
            ]);

        } catch (\Exception $e) {
            Log::error('收藏错题失败', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '收藏错题失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 标记错题已复习
     *
     * @param string $mistakeId
     * @return JsonResponse
     */
    public function markReviewed(string $mistakeId): JsonResponse
    {
        try {
            $result = $this->mistakeBookService->markReviewed($mistakeId);

            Log::info('标记错题已复习', [
                'mistake_id' => $mistakeId,
                'result' => $result
            ]);

            return response()->json([
                'success' => $result,
                'message' => $result ? '操作成功' : '操作失败',
                'data' => [
                    'mistake_id' => $mistakeId,
                    'reviewed' => $result,
                    'reviewed_at' => $result ? now()->toISOString() : null
                ]
            ]);

        } catch (\Exception $e) {
            Log::error('标记错题已复习失败', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '标记错题已复习失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 加入重练清单
     *
     * @param string $mistakeId
     * @return JsonResponse
     */
    public function addToRetryList(string $mistakeId): JsonResponse
    {
        try {
            $result = $this->mistakeBookService->addToRetryList($mistakeId);

            Log::info('加入重练清单', [
                'mistake_id' => $mistakeId,
                'result' => $result
            ]);

            return response()->json([
                'success' => $result,
                'message' => $result ? '操作成功' : '操作失败',
                'data' => [
                    'mistake_id' => $mistakeId,
                    'added' => $result
                ]
            ]);

        } catch (\Exception $e) {
            Log::error('加入重练清单失败', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '加入重练清单失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 获取题目正确率
     *
     * @param string $questionId
     * @return JsonResponse
     */
    public function getQuestionAccuracy(string $questionId): JsonResponse
    {
        try {
            $accuracy = $this->mistakeBookService->getQuestionAccuracy($questionId);

            Log::info('获取题目正确率成功', [
                'question_id' => $questionId,
                'accuracy' => $accuracy
            ]);

            return response()->json([
                'success' => true,
                'data' => [
                    'question_id' => $questionId,
                    'accuracy' => $accuracy,
                    'correct_attempts' => null // LearningAnalytics不返回具体次数
                ]
            ]);

        } catch (\Exception $e) {
            Log::error('获取题目正确率失败', [
                'question_id' => $questionId,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取题目正确率失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 推荐练习题
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function recommendPractice(Request $request): JsonResponse
    {
        try {
            $studentId = $request->get('student_id');
            $kpIds = $request->get('kp_ids', []);
            $skillIds = $request->get('skill_ids', []);

            if (!$studentId) {
                return response()->json([
                    'success' => false,
                    'message' => '缺少必要参数：student_id'
                ], 400);
            }

            $recommendations = $this->mistakeBookService->recommendPractice(
                $studentId,
                $kpIds,
                $skillIds
            );

            Log::info('获取推荐练习题成功', [
                'student_id' => $studentId,
                'kp_ids' => $kpIds,
                'recommendations_count' => count($recommendations['data'] ?? [])
            ]);

            return response()->json([
                'success' => true,
                'data' => $recommendations['data'] ?? []
            ]);

        } catch (\Exception $e) {
            Log::error('获取推荐练习题失败', [
                'student_id' => $request->get('student_id'),
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取推荐练习题失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 获取错题本快照数据（用于仪表板）
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function getSnapshot(Request $request): JsonResponse
    {
        try {
            $studentId = $request->get('student_id');
            $limit = (int) ($request->get('limit', 5));

            if (!$studentId) {
                return response()->json([
                    'success' => false,
                    'message' => '缺少必要参数：student_id'
                ], 400);
            }

            $snapshot = $this->mistakeBookService->getPanelSnapshot($studentId, $limit);

            Log::info('获取错题本快照数据成功', [
                'student_id' => $studentId,
                'limit' => $limit,
                'recent_count' => count($snapshot['recent'] ?? [])
            ]);

            return response()->json([
                'success' => true,
                'data' => $snapshot
            ]);

        } catch (\Exception $e) {
            Log::error('获取错题本快照数据失败', [
                'student_id' => $request->get('student_id'),
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取错题本快照数据失败: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * 修改错题复习状态
     */
    public function updateReviewStatus(Request $request, string $mistakeId): JsonResponse
    {
        try {
            // 优先从body获取数据，不使用query params
            $payload = $request->json()->all();
            if (empty($payload)) {
                $payload = $request->all();
            }

            $validator = validator($payload, [
                'action' => 'required|in:increment,reset,mastered',
                'force_review' => 'boolean',
            ]);

            if ($validator->fails()) {
                return response()->json([
                    'success' => false,
                    'message' => '参数错误',
                    'errors' => $validator->errors()->toArray(),
                ], 422);
            }

            $validated = $validator->validated();
            $action = $validated['action'];
            $forceReview = $validated['force_review'] ?? false;

            $result = $this->mistakeBookService->updateReviewStatus($mistakeId, $action, $forceReview);

            if ($result['success'] ?? false) {
                return response()->json([
                    'success' => true,
                    'data' => $result,
                    'message' => $result['message'] ?? '复习状态更新成功',
                ]);
            }

            return response()->json([
                'success' => false,
                'message' => $result['error'] ?? '更新复习状态失败',
            ], 400);
        } catch (\Throwable $e) {
            Log::error('Update review status error', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '更新复习状态失败',
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 获取错题复习状态
     */
    public function getReviewStatus(string $mistakeId): JsonResponse
    {
        try {
            $result = $this->mistakeBookService->getReviewStatus($mistakeId);

            if ($result['success'] ?? false) {
                return response()->json([
                    'success' => true,
                    'data' => $result,
                ]);
            }

            return response()->json([
                'success' => false,
                'message' => $result['error'] ?? '获取复习状态失败',
            ], 400);
        } catch (\Throwable $e) {
            Log::error('Get review status error', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取复习状态失败',
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 增加复习次数
     */
    public function incrementReview(Request $request, string $mistakeId): JsonResponse
    {
        try {
            $validated = $request->validate([
                'force_review' => 'boolean',
            ]);

            $forceReview = $validated['force_review'] ?? false;

            $result = $this->mistakeBookService->incrementReviewCount($mistakeId, $forceReview);

            if ($result['success'] ?? false) {
                return response()->json([
                    'success' => true,
                    'data' => $result,
                    'message' => $result['message'] ?? '复习次数增加成功',
                ]);
            }

            return response()->json([
                'success' => false,
                'message' => $result['error'] ?? '增加复习次数失败',
            ], 400);
        } catch (\Throwable $e) {
            Log::error('Increment review count error', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '增加复习次数失败',
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 重置为强制复习状态
     */
    public function resetReview(string $mistakeId): JsonResponse
    {
        try {
            $result = $this->mistakeBookService->resetReviewStatus($mistakeId);

            if ($result['success'] ?? false) {
                return response()->json([
                    'success' => true,
                    'data' => $result,
                    'message' => $result['message'] ?? '复习状态重置成功',
                ]);
            }

            return response()->json([
                'success' => false,
                'message' => $result['error'] ?? '重置复习状态失败',
            ], 400);
        } catch (\Throwable $e) {
            Log::error('Reset review status error', [
                'mistake_id' => $mistakeId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '重置复习状态失败',
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 批量操作错题
     */
    public function batchOperation(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'mistake_ids' => 'required|array|min:1',
                'mistake_ids.*' => 'string',
                'operation' => 'required|string|in:favorite,reviewed,mastered,retry_list,remove_retry_list,set_error_type,set_importance',
                'params' => 'array',
            ]);

            $mistakeIds = $validated['mistake_ids'];
            $operation = $validated['operation'];
            $params = $validated['params'] ?? [];

            $result = $this->mistakeBookService->batchOperation($mistakeIds, $operation, $params);

            if ($result['success'] ?? false) {
                return response()->json([
                    'success' => true,
                    'data' => $result,
                    'message' => "批量操作成功，成功处理 {$result['success_count']} 条记录",
                ]);
            }

            return response()->json([
                'success' => false,
                'message' => $result['error'] ?? '批量操作失败',
            ], 400);
        } catch (\Throwable $e) {
            Log::error('Batch operation error', [
                'error' => $e->getMessage(),
                'request' => $request->all(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '批量操作失败',
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 批量标记为已复习
     */
    public function batchMarkReviewed(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'reviewed'
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已标记 {$result['success_count']} 道题为已复习"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量标记为已掌握
     */
    public function batchMarkMastered(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'mastered'
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已标记 {$result['success_count']} 道题为已掌握"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量加入重练清单
     */
    public function batchAddToRetryList(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'retry_list'
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已加入 {$result['success_count']} 道题到重练清单"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量从重练清单移除
     */
    public function batchRemoveFromRetryList(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'remove_retry_list'
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已从重练清单移除 {$result['success_count']} 道题"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量设置错误类型
     */
    public function batchSetErrorType(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
            'error_type' => 'required|string|in:concept,calculation,careless,logic,other',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'set_error_type',
            ['error_type' => $validated['error_type']]
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已为 {$result['success_count']} 道题设置错误类型"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量设置重要程度
     */
    public function batchSetImportance(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
            'importance' => 'required|integer|min:1|max:10',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'set_importance',
            ['importance' => $validated['importance']]
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已为 {$result['success_count']} 道题设置重要程度"
                : ($result['error'] ?? '操作失败'),
        ]);
    }

    /**
     * 批量切换收藏状态
     */
    public function batchToggleFavorite(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'mistake_ids' => 'required|array|min:1',
            'mistake_ids.*' => 'string',
        ]);

        $result = $this->mistakeBookService->batchOperation(
            $validated['mistake_ids'],
            'favorite'
        );

        return response()->json([
            'success' => $result['success'] ?? false,
            'data' => $result,
            'message' => $result['success'] ?? false
                ? "已为 {$result['success_count']} 道题切换收藏状态"
                : ($result['error'] ?? '操作失败'),
        ]);
    }
}