import { z } from "zod"

// ---------------------------------------------------------------------------
// 基础校验
// ---------------------------------------------------------------------------

export const AiChatMessageSchema = z.object({
  role: z.enum(["system", "user", "assistant"]),
  content: z.string().min(1).max(8000),
})

export const AiChatInputSchema = z.object({
  messages: z.array(AiChatMessageSchema).min(1).max(50),
  providerId: z.string().min(1).optional(),
})

// ---------------------------------------------------------------------------
// 业务场景校验
// ---------------------------------------------------------------------------

export const SimilarQuestionInputSchema = z.object({
  questionText: z.string().min(1).max(4000),
  questionType: z.string().min(1),
  subject: z.string().optional(),
  knowledgePointIds: z.array(z.string()).optional(),
  count: z.number().int().min(1).max(10).optional(),
})

export const GradingInputSchema = z.object({
  questionText: z.string().min(1).max(4000),
  questionType: z.string().min(1),
  studentAnswer: z.string().min(1).max(8000),
  correctAnswer: z.string().optional(),
  maxScore: z.number().int().min(1).max(100),
  subject: z.string().optional(),
})

export const LessonContentInputSchema = z.object({
  topic: z.string().min(1).max(500),
  subject: z.string().optional(),
  grade: z.string().optional(),
  textbookId: z.string().optional(),
  chapterId: z.string().optional(),
  contentType: z.enum(["activity", "assessment", "question", "material"]),
  additionalContext: z.string().max(2000).optional(),
})

export const QuestionVariantInputSchema = z.object({
  originalQuestion: z.object({
    text: z.string().min(1).max(4000),
    type: z.string().min(1),
    difficulty: z.number().int().min(1).max(5).optional(),
    options: z
      .array(
        z.object({
          id: z.string().min(1),
          text: z.string().min(1),
          isCorrect: z.boolean().optional(),
        })
      )
      .optional(),
    answer: z.string().optional(),
  }),
  subject: z.string().optional(),
  variantType: z.enum(["same_knowledge_point", "different_difficulty", "different_format"]),
})

export const WeaknessAnalysisInputSchema = z.object({
  studentId: z.string().min(1),
  subjectId: z.string().optional(),
  errorItems: z
    .array(
      z.object({
        questionText: z.string().min(1),
        questionType: z.string().min(1),
        knowledgePointIds: z.array(z.string()).optional(),
        errorCount: z.number().int().min(1),
        masteryLevel: z.number().int().min(0).max(5),
      })
    )
    .min(1)
    .max(100),
})

// ---------------------------------------------------------------------------
// AI 返回结果校验（用于解析 AI JSON 输出）
// ---------------------------------------------------------------------------

export const SimilarQuestionResultSchema = z.object({
  text: z.string().min(1),
  type: z.string().min(1),
  difficulty: z.number().int().min(1).max(5).optional(),
  options: z.array(z.object({ id: z.string(), text: z.string() })).optional(),
  answer: z.string().optional(),
  explanation: z.string().optional(),
})

export const SimilarQuestionListSchema = z.array(SimilarQuestionResultSchema)

export const GradingSuggestionSchema = z.object({
  suggestedScore: z.number().min(0),
  confidence: z.number().min(0).max(1),
  feedback: z.string(),
  reasoning: z.string(),
})

export const LessonContentResultSchema = z.object({
  title: z.string().min(1),
  content: z.string().min(1),
  metadata: z.record(z.string(), z.unknown()).optional(),
})

export const QuestionVariantResultSchema = z.object({
  text: z.string().min(1),
  type: z.string().min(1),
  difficulty: z.number().int().min(1).max(5),
  options: z
    .array(z.object({ id: z.string(), text: z.string(), isCorrect: z.boolean() }))
    .optional(),
  answer: z.string().optional(),
  explanation: z.string().optional(),
})

export const WeaknessAnalysisResultSchema = z.object({
  weakAreas: z.array(
    z.object({
      area: z.string().min(1),
      severity: z.enum(["high", "medium", "low"]),
      suggestion: z.string().min(1),
    })
  ),
  studyPlan: z.string().min(1),
  recommendedResources: z.array(z.string()),
})

// ---------------------------------------------------------------------------
// 家长学情摘要校验
// ---------------------------------------------------------------------------

export const ChildSummaryInputSchema = z.object({
  studentId: z.string().min(1),
  studentName: z.string().optional(),
  grade: z.string().optional(),
  recentGrades: z
    .array(
      z.object({
        subject: z.string().min(1),
        score: z.number(),
        maxScore: z.number(),
        trend: z.enum(["up", "down", "stable"]),
      })
    )
    .optional(),
  attendanceRate: z.number().min(0).max(1).optional(),
  errorBookSummary: z
    .object({
      totalErrors: z.number().int().min(0),
      topWeakSubjects: z.array(z.string()),
      masteryTrend: z.enum(["improving", "declining", "stable"]),
    })
    .optional(),
  homeworkCompletionRate: z.number().min(0).max(1).optional(),
})

export const ChildSummaryResultSchema = z.object({
  overallAssessment: z.string().min(1),
  strengths: z.array(z.string()),
  areasForImprovement: z.array(z.string()),
  familyTutoringSuggestions: z.array(z.string()),
  nextSteps: z.array(z.string()),
})

// ---------------------------------------------------------------------------
// 学习路径推荐校验
// ---------------------------------------------------------------------------

export const StudyPathInputSchema = z.object({
  studentId: z.string().min(1),
  subject: z.string().optional(),
  currentMastery: z
    .array(
      z.object({
        knowledgePoint: z.string().min(1),
        masteryLevel: z.number().min(0).max(5),
        errorCount: z.number().int().min(0),
      })
    )
    .optional(),
  learningGoal: z.string().optional(),
})

export const StudyPathResultSchema = z.object({
  currentLevel: z.string().min(1),
  learningPath: z.array(
    z.object({
      step: z.number().int().min(1),
      knowledgePoint: z.string().min(1),
      status: z.enum(["mastered", "in_progress", "needs_work"]),
      recommendedAction: z.string().min(1),
      estimatedTime: z.string().min(1),
    })
  ),
  summary: z.string().min(1),
  motivation: z.string().min(1),
})