package handler

import (
	"net/http"
	"strconv"
	"strings"

	"soul-api/internal/database"
	"soul-api/internal/model"

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

// DBCKBPersonLeads GET /api/db/ckb-person-leads
// - 不带 token：返回每个 Person 的获客数（基于 ckb_lead_records.target_person_id）
// - 带 token：返回该 Person 的获客明细（分页）
func DBCKBPersonLeads(c *gin.Context) {
	db := database.DB()
	token := strings.TrimSpace(c.Query("token"))

	// 1) 汇总：每个人物的获客数（按 user_id 去重，同一用户多次留资只算 1 人）
	if token == "" {
		type Row struct {
			Token string `json:"token"`
			Total int64  `json:"total"`
		}
		var rows []Row
		if err := db.Raw(`
			SELECT p.token AS token, COUNT(DISTINCT l.user_id) AS total
			FROM persons p
			LEFT JOIN ckb_lead_records l ON l.target_person_id = p.person_id
			GROUP BY p.token
		`).Scan(&rows).Error; err != nil {
			c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
			return
		}
		c.JSON(http.StatusOK, gin.H{"success": true, "byPerson": rows})
		return
	}

	// 2) 明细：某个人物的获客列表
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("pageSize", "20"))
	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}

	var person model.Person
	// token 是管理端/小程序统一引用的主键；兜底允许传 personId（便于排查/手工调用）
	if err := db.Where("token = ? OR person_id = ?", token, token).First(&person).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "未找到人物"})
		return
	}

	var total int64
	db.Model(&model.CkbLeadRecord{}).Where("target_person_id = ?", person.PersonID).
		Select("COUNT(DISTINCT user_id)").Scan(&total)

	var records []model.CkbLeadRecord
	if err := db.Raw(`
		SELECT l.*
		FROM ckb_lead_records l
		INNER JOIN (
			SELECT user_id, MAX(created_at) AS max_at
			FROM ckb_lead_records
			WHERE target_person_id = ?
			GROUP BY user_id
		) latest ON l.user_id = latest.user_id AND l.created_at = latest.max_at
		WHERE l.target_person_id = ?
		ORDER BY l.created_at DESC
		LIMIT ? OFFSET ?
	`, person.PersonID, person.PersonID, pageSize, (page-1)*pageSize).Scan(&records).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
		return
	}

	out := make([]gin.H, 0, len(records))
	for _, r := range records {
		out = append(out, gin.H{
			"id":        r.ID,
			"userId":    r.UserID,
			"nickname":  r.Nickname,
			"phone":     r.Phone,
			"wechatId":  r.WechatID,
			"name":      r.Name,
			"source":    r.Source,
			"createdAt": r.CreatedAt,
		})
	}

	c.JSON(http.StatusOK, gin.H{
		"success":    true,
		"records":    out,
		"total":      total,
		"page":       page,
		"pageSize":   pageSize,
		"personName": person.Name,
	})
}