// 复盘接口（仅 KPT 法）
package app

import (
	"fmt"
	"math/rand"
	"os"
	"simple-memo/global"
	"simple-memo/models"
	"simple-memo/utils"
	"time"

	"gorm.io/gorm"

	"github.com/gin-gonic/gin"
)

// -------------------------- 1. 定义 Handler 接口 --------------------------
type ReviewHandler interface {
	SaveReview(c *gin.Context)   // 保存复盘
	GetReview(c *gin.Context)    // 获取单日复盘
	ReviewList(c *gin.Context)   // 获取复盘列表
	DeleteReview(c *gin.Context) // 删除复盘
}

// -------------------------- 2. 实现结构体 --------------------------
type reviewHandler struct {
	db *gorm.DB
}

func NewReviewHandler() ReviewHandler {
	return &reviewHandler{
		db: global.DB,
	}
}

// -------------------------- 3. 请求结构体 --------------------------

// SaveReviewReq 保存复盘请求
type SaveReviewReq struct {
	Date string           `json:"date" binding:"required"` // YYYY-MM-DD
	Kpt  SaveReviewKPTDto `json:"kpt"`
}
type SaveReviewKPTDto struct {
	Keep    string `json:"keep"`
	Problem string `json:"problem"`
	Try     string `json:"try"`
}

// GetReviewReq 获取单日复盘请求
type GetReviewReq struct {
	Date string `json:"date" binding:"required"`
}

// ReviewListReq 获取复盘列表请求
type ReviewListReq struct {
	StartDate string `json:"start_date"`
	EndDate   string `json:"end_date"`
	Keyword   string `json:"keyword"`
	Page      int    `json:"page"`
	PageSize  int    `json:"page_size"`
}

// DeleteReviewReq 删除复盘请求
type DeleteReviewReq struct {
	ID uint `json:"id" binding:"required"`
}

// -------------------------- 4. 接口实现 --------------------------

// SaveReview 保存复盘
func (h *reviewHandler) SaveReview(c *gin.Context) {
	userID := c.GetUint("userID")
	var req SaveReviewReq

	if err := c.ShouldBindJSON(&req); err != nil {
		utils.Fail(c, "参数解析失败")
		return
	}

	var review models.Review
	isNewRecord := false

	err := h.db.Where("user_id = ? AND date = ?", userID, req.Date).First(&review).Error
	if err == gorm.ErrRecordNotFound {
		review = models.Review{
			UserID:  userID,
			Date:    req.Date,
			Keep:    utils.FilterSensitive(req.Kpt.Keep),
			Problem: utils.FilterSensitive(req.Kpt.Problem),
			Try:     utils.FilterSensitive(req.Kpt.Try),
		}
		isNewRecord = true
	} else if err != nil {
		utils.Fail(c, "查询失败")
		return
	} else {
		review.Keep = utils.FilterSensitive(req.Kpt.Keep)
		review.Problem = utils.FilterSensitive(req.Kpt.Problem)
		review.Try = utils.FilterSensitive(req.Kpt.Try)
	}

	if isNewRecord {
		if err := h.db.Create(&review).Error; err != nil {
			utils.Fail(c, "保存失败")
			return
		}
	} else {
		if err := h.db.Save(&review).Error; err != nil {
			utils.Fail(c, "保存失败")
			return
		}
	}

	var growthResult any
	debugMode := os.Getenv("DEBUG_MODE")
	if isNewRecord {
		today := time.Now().Format("2006-01-02")
		if req.Date == today {
			if debugMode == "true" {
				rand.Seed(time.Now().UnixNano())
				levelUp := rand.Intn(10) < 2
				hasAchievement := rand.Intn(10) < 3
				growthResult = MockGrowthRewards(levelUp, hasAchievement)
			} else {
				growthHandler := NewGrowthHandler()
				growthResult = growthHandler.AddExpInternal(userID, "review", fmt.Sprintf("%d", review.ID), nil)
			}
		}
	}

	utils.Ok(c, gin.H{
		"success":     true,
		"growth":      growthResult,
		"review":      review,
		"isNewRecord": isNewRecord,
	})
}

// GetReview 获取单日复盘
func (h *reviewHandler) GetReview(c *gin.Context) {
	userID := c.GetUint("userID")
	var req GetReviewReq

	if err := c.ShouldBindJSON(&req); err != nil {
		utils.Fail(c, "参数解析失败")
		return
	}

	var review models.Review
	err := h.db.Where("user_id = ? AND date = ?", userID, req.Date).First(&review).Error
	if err == gorm.ErrRecordNotFound {
		utils.Ok(c, nil)
		return
	} else if err != nil {
		utils.Fail(c, "查询失败")
		return
	}

	utils.Ok(c, review)
}

// ReviewList 获取复盘列表
func (h *reviewHandler) ReviewList(c *gin.Context) {
	userID := c.GetUint("userID")
	var req ReviewListReq

	if err := c.ShouldBindJSON(&req); err != nil {
		utils.Fail(c, "参数解析失败")
		return
	}

	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 20
	}

	db := h.db.Model(&models.Review{}).Where("user_id = ?", userID)

	if req.StartDate != "" && req.EndDate != "" {
		db = db.Where("date BETWEEN ? AND ?", req.StartDate, req.EndDate)
	} else if req.StartDate != "" {
		db = db.Where("date >= ?", req.StartDate)
	} else if req.EndDate != "" {
		db = db.Where("date <= ?", req.EndDate)
	}

	if req.Keyword != "" {
		keyword := "%" + req.Keyword + "%"
		db = db.Where("(keep LIKE ? OR problem LIKE ? OR try LIKE ?)", keyword, keyword, keyword)
	}

	var total int64
	db.Count(&total)

	var list []models.Review
	offset := (req.Page - 1) * req.PageSize
	err := db.Order("date DESC").Offset(offset).Limit(req.PageSize).Find(&list).Error
	if err != nil {
		utils.Fail(c, "查询失败")
		return
	}

	type ReviewListItem struct {
		ID      uint   `json:"id"`
		Date    string `json:"date"`
		Summary string `json:"summary"`
	}

	result := make([]ReviewListItem, len(list))
	for i, r := range list {
		summary := r.Keep
		if len(summary) > 50 {
			summary = summary[:50] + "..."
		}
		result[i] = ReviewListItem{
			ID:      r.ID,
			Date:    r.Date,
			Summary: summary,
		}
	}

	utils.Ok(c, gin.H{
		"list":     result,
		"total":    total,
		"page":     req.Page,
		"pageSize": req.PageSize,
	})
}

// DeleteReview 删除复盘
func (h *reviewHandler) DeleteReview(c *gin.Context) {
	userID := c.GetUint("userID")
	var req DeleteReviewReq

	if err := c.ShouldBindJSON(&req); err != nil {
		utils.Fail(c, "参数解析失败")
		return
	}

	var review models.Review
	err := h.db.Where("id = ? AND user_id = ?", req.ID, userID).First(&review).Error
	if err == gorm.ErrRecordNotFound {
		utils.Fail(c, "复盘不存在")
		return
	} else if err != nil {
		utils.Fail(c, "查询失败")
		return
	}

	if err := h.db.Delete(&review).Error; err != nil {
		utils.Fail(c, "删除失败")
		return
	}

	growthHandler := NewGrowthHandler()
	today := time.Now().Format("2006-01-02")
	deducted := growthHandler.DeductExpInternal(userID, "review", fmt.Sprintf("%d", req.ID), today)

	utils.Ok(c, gin.H{
		"success":      true,
		"deducted_exp": deducted,
	})
}