package api

import (
	"encoding/json"

	"github.com/gin-gonic/gin"

	"eai_agentplatform/backend/internal/middleware"
	"eai_agentplatform/backend/internal/model"
	"eai_agentplatform/backend/internal/store"
	"eai_agentplatform/backend/internal/web"
)

// 本文件用到的仓库：questionRepo/examRecordRepo 声明在 exam.go，learningRepo 声明在 learning.go。

// domainLabels 能力雷达维度（正式考试按域聚合的掌握度）。
var domainLabels = map[string]string{
	"company": "公司认知",
	"product": "产品知识",
	"sales":   "销售能力",
}

// domainOrder 雷达图固定排序。
var domainOrder = []string{"company", "product", "sales"}

// detailWrap 正式考试答题明细（与 ExamSubmit 持久化的 detail_json 结构对齐）。
type detailWrap struct {
	Questions []struct {
		QuestionID uint `json:"question_id"`
		IsCorrect  bool `json:"is_correct"`
	} `json:"questions"`
}

// MyProfile GET /api/my/profile —— 学员学习档案：能力雷达 + 学习统计 + 成绩趋势 + 积分。
func MyProfile(c *gin.Context) {
	u := middleware.CurrentUser(c)
	if u == nil {
		web.Fail(c, web.NewAuthError("未登录"))
		return
	}

	// 学习进度（公司/产品/课程浏览）
	lps := learningRepo.ListByUser(u.ID)
	companyViewed := false
	productViewed, courseViewed := 0, 0
	for _, lp := range lps {
		switch lp.ItemType {
		case "company":
			companyViewed = true
		case "product":
			productViewed++
		case "course":
			courseViewed++
		}
	}

	// 错题统计
	mistakeTotal := mistakeRepo.CountByUser(u.ID)
	mistakeResolved := mistakeRepo.CountResolvedByUser(u.ID)

	// 自测次数（自测不落 exam_record，改由积分流水统计）
	var selfTestCount int64
	store.DB.Model(&model.PointEvent{}).Where("user_id = ? AND event_type = ?", u.ID, "self_test").Count(&selfTestCount)

	// 正式考试记录 + 按域能力聚合（趋势图要按时间正序）
	recs := examRecordRepo.ListByUserChronological(u.ID)

	// 题目 → 域映射（用于从答题明细反推各域掌握度）
	qDomain := questionRepo.DomainMap()

	type domainAgg struct {
		Correct int `json:"correct"`
		Total   int `json:"total"`
	}
	perDomain := map[string]*domainAgg{}
	formalPassed := 0
	trend := make([]gin.H, 0, len(recs))
	for _, r := range recs {
		if r.Passed {
			formalPassed++
		}
		trend = append(trend, gin.H{
			"exam_name":    r.ExamName,
			"score":        r.Score,
			"total_score":  r.TotalScore,
			"passed":       r.Passed,
			"submitted_at": r.SubmittedAt,
		})

		var dw detailWrap
		if err := json.Unmarshal([]byte(r.DetailJSON), &dw); err != nil {
			continue
		}
		for _, qd := range dw.Questions {
			domain := qDomain[qd.QuestionID]
			if domain == "" {
				continue
			}
			a := perDomain[domain]
			if a == nil {
				a = &domainAgg{}
				perDomain[domain] = a
			}
			a.Total++
			if qd.IsCorrect {
				a.Correct++
			}
		}
	}

	domains := make([]gin.H, 0, len(domainOrder))
	for _, d := range domainOrder {
		a := perDomain[d]
		if a == nil {
			a = &domainAgg{}
		}
		mastery := 0.0
		if a.Total > 0 {
			mastery = round1(float64(a.Correct) * 100 / float64(a.Total))
		}
		domains = append(domains, gin.H{
			"domain":  d,
			"label":   domainLabels[d],
			"correct": a.Correct,
			"total":   a.Total,
			"mastery": mastery,
		})
	}

	// 薄弱点：有作答记录中掌握度最低的域
	weakDomain := ""
	weakMastery := 100.0
	for _, d := range domains {
		if d["total"].(int) > 0 && d["mastery"].(float64) < weakMastery {
			weakMastery = d["mastery"].(float64)
			weakDomain = d["domain"].(string)
		}
	}

	web.OK(c, gin.H{
		"learning_points": u.LearningPoints,
		"stats": gin.H{
			"company_viewed":   companyViewed,
			"product_viewed":   productViewed,
			"course_viewed":    courseViewed,
			"self_test_count":  selfTestCount,
			"formal_count":     len(recs),
			"formal_passed":    formalPassed,
			"mistake_count":    mistakeTotal,
			"mistake_resolved": mistakeResolved,
		},
		"domains":       domains,
		"weak_domain":   weakDomain,
		"recent_scores": trend,
	})
}