package handler

import (
	"net/http"
	"strconv"
	"strings"
	"unicode/utf8"

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

// ===== 积分管理（usersAPI 组：RequireStaff + CSRF + PermUsers，超管/站长） =====

// adminAdjustMaxDelta 单次调整量的绝对值上界（与积分规则值上界同级）
const adminAdjustMaxDelta = 100000

// AdminAdjustUserPoints 管理员手动调整用户积分：
// 加分走 CreditTx（同步累加累计获得→可升级），扣分走 DebitTx（仅扣余额、不降级）；
// 理由必填，写入流水 note（reason=admin_adjust），响应返回调整后余额/累计/等级。
func (h *Handlers) AdminAdjustUserPoints(c *gin.Context) {
	id, ok := parseAdminUserID(c)
	if !ok {
		return
	}
	var body struct {
		Delta int    `json:"delta"`
		Note  string `json:"note"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
		return
	}
	if body.Delta == 0 || body.Delta > adminAdjustMaxDelta || body.Delta < -adminAdjustMaxDelta {
		c.JSON(http.StatusBadRequest, gin.H{"error": "积分数量无效"})
		return
	}
	note := strings.TrimSpace(body.Note)
	if note == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "调整理由必填"})
		return
	}
	if utf8.RuneCountInString(note) > 200 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "调整理由过长（≤200 字）"})
		return
	}
	bal, total, level, err := h.Points.AdminAdjustPoints(id, body.Delta, note)
	if err != nil {
		respondAdminUserError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"balance": bal, "total_points": total, "level": level})
}

// AdminUserPointLedger 某用户的积分流水（分页，id DESC）
func (h *Handlers) AdminUserPointLedger(c *gin.Context) {
	id, ok := parseAdminUserID(c)
	if !ok {
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	items, total, err := h.Points.AdminUserLedger(id, page, 20)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取积分流水失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"items": nonNilSlice(items), "total": total, "page": page, "size": 20})
}