package logic

import (
	"context"
	"encoding/json"
	"sort"
	"strings"
	"time"

	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
	"golang.org/x/crypto/bcrypt"

	v1 "tool-api/api/admin/v1"
	"tool-api/internal/consts"
	"tool-api/internal/model/entity"
)

// ===== 看板等级口径（唯一真实来源：EffectiveLevelKey / IsLevelExpired）=====
//
// 约定（见 level.go）：users.level_expire_at 为 NULL 表示**永久有效**，
// 管理员手动分配的等级一律为 NULL；只有已过期才回落默认等级。

// isActiveMember 是否为「有效会员」：生效等级 ≠ 默认等级即视为会员。
// 生效等级走 EffectiveLevelKey —— 永久（NULL）与未过期同为有效，已过期回落默认等级。
func isActiveMember(u *entity.Users) bool {
	return EffectiveLevelKey(u) != consts.DefaultLevelKey
}

// countActiveMembers 统计有效会员数（与 C 端 EffectiveLevel 口径完全一致）。
func countActiveMembers(users []*entity.Users) int64 {
	var n int64
	for _, u := range users {
		if isActiveMember(u) {
			n++
		}
	}
	return n
}

// levelDistribution 按「生效等级」聚合用户分布：已过期用户归入默认等级桶。
func levelDistribution(users []*entity.Users) map[string]int64 {
	dist := make(map[string]int64, 4)
	for _, u := range users {
		dist[EffectiveLevelKey(u)]++
	}
	return dist
}

// resolveSort 解析排序参数：sortBy 必须命中白名单（key=前端字段，value=真实列名），
// 未命中则回落到 fallback（形如 "id desc" / "sort asc"）。返回 (column, direction)。
// 通过白名单映射，杜绝把用户输入直接拼进 ORDER BY 造成的注入。
func resolveSort(sortBy, sortOrder string, whitelist map[string]string, fallback string) (column, direction string) {
	const (
		dirAsc  = "asc"
		dirDesc = "desc"
	)
	col, ok := whitelist[sortBy]
	if !ok || col == "" {
		// 解析 fallback："列名 方向"
		parts := strings.Fields(fallback)
		if len(parts) == 2 {
			return parts[0], strings.ToLower(parts[1])
		}
		if len(parts) == 1 {
			return parts[0], dirDesc
		}
		return "id", dirDesc
	}
	if strings.EqualFold(sortOrder, dirAsc) {
		return col, dirAsc
	}
	return col, dirDesc
}

// applySort 把 resolveSort 的结果作用到查询上。
func applySort(m *gdb.Model, sortBy, sortOrder string, whitelist map[string]string, fallback string) *gdb.Model {
	col, dir := resolveSort(sortBy, sortOrder, whitelist, fallback)
	if dir == "asc" {
		return m.OrderAsc(col)
	}
	return m.OrderDesc(col)
}

// ===== 登录 =====

func AdminLogin(ctx context.Context, account, password string) (*v1.LoginRes, error) {
	record, err := g.Model(consts.TableAdminUsers).Where("account", account).One()
	if err != nil {
		return nil, err
	}
	if record.IsEmpty() {
		return nil, gerror.New("账号或密码错误")
	}
	if err = bcrypt.CompareHashAndPassword([]byte(record["password"].String()), []byte(password)); err != nil {
		return nil, gerror.New("账号或密码错误")
	}
	nickName := record["nick_name"].String()
	roleName := record["role_name"].String()
	roleValue := record["role_value"].String()
	token, err := IssueToken(ctx, consts.AudAdmin, record["id"].Int64(), map[string]string{
		"nickName":  nickName,
		"roleName":  roleName,
		"roleValue": roleValue,
	})
	if err != nil {
		return nil, err
	}
	return &v1.LoginRes{Token: token, NickName: nickName, RoleName: roleName, RoleValue: roleValue}, nil
}

func AdminMyInfo(ctx context.Context) (*v1.MyInfoRes, error) {
	record, err := g.Model(consts.TableAdminUsers).Where("id", CtxAdminId(ctx)).One()
	if err != nil {
		return nil, err
	}
	if record.IsEmpty() {
		return nil, gerror.NewCode(gcodeUnauthorized(), "管理员不存在")
	}
	roleValue := record["role_value"].String()
	return &v1.MyInfoRes{
		Id:          record["id"].Int64(),
		Account:     record["account"].String(),
		NickName:    record["nick_name"].String(),
		RoleName:    record["role_name"].String(),
		RoleValue:   roleValue,
		Permissions: PermissionsOf(roleValue),
	}, nil
}

// ===== 用户管理 =====

func AdminUserList(ctx context.Context, req *v1.UserListReq) (*v1.UserListRes, error) {
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 20
	}
	// 软删除：列表默认排除已删用户
	m := g.Model(consts.TableUsers).WhereNull("deleted_at")
	if req.Keyword != "" {
		kw := "%" + req.Keyword + "%"
		m = m.Where("nickname LIKE ? OR openid LIKE ?", kw, kw)
	}
	// ===== T16 多条件筛选 =====
	if req.LevelKey != "" {
		m = m.Where("level_key", req.LevelKey)
	}
	if req.Status != nil {
		m = m.Where("status", *req.Status)
	}
	if req.DateFrom != "" {
		m = m.WhereGTE("created_at", req.DateFrom+" 00:00:00")
	}
	if req.DateTo != "" {
		m = m.WhereLTE("created_at", req.DateTo+" 23:59:59")
	}
	// ===== T04.6 会员到期筛选 =====
	if cond := memberExpireCondition(req.MemberExpire); cond != "" {
		m = m.Where(cond)
	}
	total, err := m.Count()
	if err != nil {
		return nil, err
	}
	// ===== T16 排序（白名单，仅真实列）=====
	var userSortWhitelist = map[string]string{
		"id": "id", "created_at": "created_at", "level_key": "level_key", "status": "status",
	}
	records, err := applySort(m.Page(req.Page, req.PageSize), req.SortBy, req.SortOrder, userSortWhitelist, "id desc").All()
	if err != nil {
		return nil, err
	}
	levelNames, err := levelNameMap(ctx)
	if err != nil {
		return nil, err
	}
	list := make([]v1.AdminUserItem, 0, len(records))
	for _, r := range records {
		item := v1.AdminUserItem{
			Id:              r["id"].Int64(),
			Nickname:        r["nickname"].String(),
			AvatarUrl:       r["avatar_url"].String(),
			Openid:          r["openid"].String(),
			LevelKey:        r["level_key"].String(),
			LevelName:       levelNames[r["level_key"].String()],
			QuotaPeriodDays: r["quota_period_days"].Int(),
			Status:          r["status"].Int(),
			CreatedAt:       r["created_at"].String(),
		}
		if expire := r["level_expire_at"].GTime(); expire != nil && !expire.IsZero() {
			item.LevelExpireAt = expire.Format("Y-m-d")
		}
		list = append(list, item)
	}
	// 附加使用统计
	if len(list) > 0 {
		ids := make([]int64, 0, len(list))
		for _, u := range list {
			ids = append(ids, u.Id)
		}
		stats, err := g.Model(consts.TableUsageLogs).
			Fields("user_id, COUNT(*) AS c, MAX(used_at) AS last_used").
			WhereIn("user_id", ids).Group("user_id").All()
		if err == nil {
			statMap := map[int64]gdb.Record{}
			for _, s := range stats {
				statMap[s["user_id"].Int64()] = s
			}
			for i := range list {
				if s, ok := statMap[list[i].Id]; ok {
					list[i].UsageCount = s["c"].Int64()
					list[i].LastUsedAt = s["last_used"].String()
				}
			}
		}
	}
	return &v1.UserListRes{List: list, Total: total}, nil
}

func levelNameMap(ctx context.Context) (map[string]string, error) {
	records, err := g.Model(consts.TableLevels).All()
	if err != nil {
		return nil, err
	}
	m := map[string]string{}
	for _, r := range records {
		m[r["level_key"].String()] = r["name"].String()
	}
	return m, nil
}

func AdminUserSetLevel(ctx context.Context, userId int64, levelKey, expireAt, remark string) (*v1.UserSetLevelRes, error) {
	// 等级必须存在且已启用，否则 4012（弹窗内红字，不关闭弹窗）
	level, err := g.Model(consts.TableLevels).Where("level_key", levelKey).Where("is_enabled", 1).One()
	if err != nil {
		return nil, err
	}
	if level.IsEmpty() {
		return nil, errLevelInvalid("等级不存在或已停用")
	}
	// 软删除：已删用户不可再操作等级
	before, err := g.Model(consts.TableUsers).Where("id", userId).WhereNull("deleted_at").One()
	if err != nil {
		return nil, err
	}
	if before.IsEmpty() {
		return nil, gerror.New("用户不存在")
	}

	prevExpire := before["level_expire_at"].GTime()
	prevPermanent := prevExpire == nil || prevExpire.IsZero()
	newExpire := parseOptionalTime(expireAt) // 空 → nil → 写 NULL（永久）
	// 约定 S10：level_expire_at IS NULL = 永久；续费/手动开通**不得把永久覆写成有限期**。
	// 判定抽为纯函数 levelExpireTransitionErr（见 admin_level_s10.go），便于单测覆盖。
	if err = levelExpireTransitionErr(prevPermanent, newExpire); err != nil {
		return nil, err
	}

	// newExpire 为 nil 时写 NULL（GoFrame 将 nil 识别为 NULL）
	var expireValue interface{}
	if newExpire != nil {
		expireValue = newExpire
	}
	if _, err = g.Model(consts.TableUsers).Where("id", userId).
		Data(g.Map{
			"level_key":       levelKey,
			"level_expire_at": expireValue,
			"updated_at":      gtime.Now(),
		}).Update(); err != nil {
		return nil, err
	}
	// T17 审计：改用户等级属敏感操作（remark 落审计备注）
	WriteAudit(ctx, AuditEntry{
		Action:     "user.set_level",
		TargetType: "user",
		TargetId:   auditId(userId),
		Before:     g.Map{"level_key": before["level_key"].String(), "level_expire_at": timeStr(prevExpire)},
		After:      g.Map{"level_key": levelKey, "level_expire_at": timeStr(newExpire)},
		Result:     consts.AuditResultSuccess,
		Remark:     remark,
	})
	return &v1.UserSetLevelRes{}, nil
}

// memberExpireCondition 把「会员到期」筛选项映射为 WHERE 条件（空/未知 → 不加条件）。
//
// 口径与 EffectiveLevelKey 一致：level_expire_at IS NULL = 永久有效。
//   - expiring7  / expiring30：7/30 天内到期
//   - expired               ：已过期
//   - forever               ：永久有效（NULL）
//   - none                  ：未开通（仍是默认等级且无到期时间）
func memberExpireCondition(kind string) string {
	now := time.Now()
	ts := func(t time.Time) string { return t.Format("2006-01-02 15:04:05") }
	switch kind {
	case "expiring7":
		return "level_expire_at IS NOT NULL AND level_expire_at > '" + ts(now) +
			"' AND level_expire_at <= '" + ts(now.AddDate(0, 0, 7)) + "'"
	case "expiring30":
		return "level_expire_at IS NOT NULL AND level_expire_at > '" + ts(now) +
			"' AND level_expire_at <= '" + ts(now.AddDate(0, 0, 30)) + "'"
	case "expired":
		return "level_expire_at IS NOT NULL AND level_expire_at <= '" + ts(now) + "'"
	case "forever":
		return "level_expire_at IS NULL"
	case "none":
		return "level_key = '" + consts.DefaultLevelKey + "' AND level_expire_at IS NULL"
	default:
		return ""
	}
}

func AdminUserStatus(ctx context.Context, userId int64, status int) (*v1.UserStatusRes, error) {
	// 软删除：已删用户不可再启停
	before, err := g.Model(consts.TableUsers).Where("id", userId).WhereNull("deleted_at").One()
	if err != nil {
		return nil, err
	}
	if before.IsEmpty() {
		return nil, gerror.New("用户不存在")
	}
	if _, err := g.Model(consts.TableUsers).Where("id", userId).
		Data(g.Map{"status": status}).Update(); err != nil {
		return nil, err
	}
	WriteAudit(ctx, AuditEntry{
		Action:     "user.set_status",
		TargetType: "user",
		TargetId:   auditId(userId),
		Before:     g.Map{"status": before["status"].Int()},
		After:      g.Map{"status": status},
		Result:     consts.AuditResultSuccess,
	})
	return &v1.UserStatusRes{}, nil
}

// ===== 等级管理 =====

func AdminLevelList(ctx context.Context) (*v1.LevelListRes, error) {
	records, err := g.Model(consts.TableLevels).Order("sort asc").All()
	if err != nil {
		return nil, err
	}
	list := make([]v1.LevelItem, 0, len(records))
	for _, r := range records {
		modules := []string{}
		_ = json.Unmarshal([]byte(r["modules"].String()), &modules)
		list = append(list, v1.LevelItem{
			Id:        r["id"].Int64(),
			LevelKey:  r["level_key"].String(),
			Name:      r["name"].String(),
			Modules:   modules,
			Sort:      r["sort"].Int(),
			IsEnabled: r["is_enabled"].Int(),
			Remark:    r["remark"].String(),
		})
	}
	return &v1.LevelListRes{List: list}, nil
}

func AdminLevelSave(ctx context.Context, req *v1.LevelSaveReq) (*v1.LevelSaveRes, error) {
	modulesJson, _ := json.Marshal(req.Modules)
	data := g.Map{
		"name":       req.Name,
		"modules":    string(modulesJson),
		"sort":       req.Sort,
		"is_enabled": req.IsEnabled,
		"remark":     req.Remark,
	}
	if req.Id > 0 {
		// 编辑：level_key 是跨端契约字段，**不允许变更**。
		// 前端把该输入框置为 disabled 只是体验层，服务端才是真闸；
		// 这里读回库中现值做校验（防止未来有人改坏 data map 或直接调接口）。
		exist, err := g.Model(consts.TableLevels).Where("id", req.Id).One()
		if err != nil {
			return nil, err
		}
		if exist.IsEmpty() {
			return nil, gerror.New("等级不存在")
		}
		if err = validateLevelKeyUnchanged(exist["level_key"].String(), req.LevelKey); err != nil {
			return nil, err
		}
		if _, err := g.Model(consts.TableLevels).Where("id", req.Id).Data(data).Update(); err != nil {
			return nil, err
		}
	} else {
		count, err := g.Model(consts.TableLevels).Where("level_key", req.LevelKey).Count()
		if err != nil {
			return nil, err
		}
		if count > 0 {
			return nil, gerror.New("等级标识已存在")
		}
		data["level_key"] = req.LevelKey
		if _, err := g.Model(consts.TableLevels).Data(data).Insert(); err != nil {
			return nil, err
		}
	}
	return &v1.LevelSaveRes{}, nil
}

// validateLevelKeyUnchanged 校验「编辑等级时 level_key 未被变更」。
// level_key 是跨端契约字段（小程序按它判定权益），服务端必须保证编辑不可变更它。
// 抽成纯函数（不碰 DB）以便单测固化该闸门，见 admin_level_test.go。
func validateLevelKeyUnchanged(existing, incoming string) error {
	if existing != incoming {
		return gerror.New("等级标识不可修改（跨端契约）")
	}
	return nil
}

// ===== 模块管理 =====

func AdminModuleList(ctx context.Context) (*v1.ModuleListRes, error) {
	records, err := g.Model(consts.TableModules).Order("sort asc").All()
	if err != nil {
		return nil, err
	}
	// 软删除：模块工具数只统计未删工具
	counts, err := g.Model(consts.TableTools).WhereNull("deleted_at").Fields("module_key, COUNT(*) AS c").Group("module_key").All()
	if err != nil {
		return nil, err
	}
	countMap := map[string]int{}
	for _, c := range counts {
		countMap[c["module_key"].String()] = c["c"].Int()
	}
	list := make([]v1.ModuleItem, 0, len(records))
	for _, r := range records {
		key := r["module_key"].String()
		list = append(list, v1.ModuleItem{
			Id:          r["id"].Int64(),
			ModuleKey:   key,
			Name:        r["name"].String(),
			Icon:        r["icon"].String(),
			Description: r["description"].String(),
			Sort:        r["sort"].Int(),
			IsEnabled:   r["is_enabled"].Int(),
			ToolCount:   countMap[key],
		})
	}
	return &v1.ModuleListRes{List: list}, nil
}

func AdminModuleSave(ctx context.Context, req *v1.ModuleSaveReq) (*v1.ModuleSaveRes, error) {
	data := g.Map{
		"name":        req.Name,
		"icon":        req.Icon,
		"description": req.Description,
		"sort":        req.Sort,
		"is_enabled":  req.IsEnabled,
	}
	if req.Id > 0 {
		if _, err := g.Model(consts.TableModules).Where("id", req.Id).Data(data).Update(); err != nil {
			return nil, err
		}
	} else {
		count, err := g.Model(consts.TableModules).Where("module_key", req.ModuleKey).Count()
		if err != nil {
			return nil, err
		}
		if count > 0 {
			return nil, gerror.New("模块标识已存在")
		}
		data["module_key"] = req.ModuleKey
		if _, err := g.Model(consts.TableModules).Data(data).Insert(); err != nil {
			return nil, err
		}
	}
	return &v1.ModuleSaveRes{}, nil
}

// ===== 工具管理 =====

func AdminToolsList(ctx context.Context, req *v1.ToolsListReq) (*v1.ToolsListRes, error) {
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 50
	}
	// 软删除：列表默认排除已删工具
	m := g.Model(consts.TableTools).WhereNull("deleted_at")
	if req.ModuleKey != "" {
		m = m.Where("module_key", req.ModuleKey)
	}
	if req.Keyword != "" {
		kw := "%" + req.Keyword + "%"
		m = m.Where("name LIKE ? OR tool_key LIKE ?", kw, kw)
	}
	// ===== T16 多条件筛选（显式 is_enabled 优先于 includeDisabled 开关）=====
	if req.IsEnabled != nil {
		m = m.Where("is_enabled", *req.IsEnabled)
	} else if !req.IncludeDisabled {
		m = m.Where("is_enabled", 1)
	}
	if req.IsHot != nil {
		m = m.Where("is_hot", *req.IsHot)
	}
	total, err := m.Count()
	if err != nil {
		return nil, err
	}
	// ===== T16 排序（白名单）=====
	var toolSortWhitelist = map[string]string{
		"id": "id", "sort": "sort", "usage_count": "usage_count", "is_enabled": "is_enabled",
		"is_hot": "is_hot", "name": "name", "module_key": "module_key",
	}
	records, err := applySort(m.Page(req.Page, req.PageSize), req.SortBy, req.SortOrder, toolSortWhitelist, "sort asc").All()
	if err != nil {
		return nil, err
	}
	moduleNames, err := moduleNameMap(ctx)
	if err != nil {
		return nil, err
	}
	list := make([]v1.AdminToolItem, 0, len(records))
	for _, r := range records {
		mk := r["module_key"].String()
		list = append(list, v1.AdminToolItem{
			Id:          r["id"].Int64(),
			ToolKey:     r["tool_key"].String(),
			ModuleKey:   mk,
			ModuleName:  moduleNames[mk],
			Name:        r["name"].String(),
			Icon:        r["icon"].String(),
			Description: r["description"].String(),
			FreeQuota:   r["free_quota"].Int(),
			MemberQuota: r["member_quota"].Int(),
			PayCost:     r["pay_cost"].Int(),
			Sort:        r["sort"].Int(),
			IsEnabled:   r["is_enabled"].Int(),
			IsHot:       r["is_hot"].Int(),
			UsageCount:  r["usage_count"].Int64(),
		})
	}
	return &v1.ToolsListRes{List: list, Total: total}, nil
}

func moduleNameMap(ctx context.Context) (map[string]string, error) {
	records, err := g.Model(consts.TableModules).All()
	if err != nil {
		return nil, err
	}
	m := map[string]string{}
	for _, r := range records {
		m[r["module_key"].String()] = r["name"].String()
	}
	return m, nil
}

func AdminToolsSave(ctx context.Context, req *v1.ToolsSaveReq) (*v1.ToolsSaveRes, error) {
	payCost := req.PayCost
	if payCost <= 0 {
		payCost = 1
	}
	data := g.Map{
		"module_key":   req.ModuleKey,
		"name":         req.Name,
		"icon":         req.Icon,
		"description":  req.Description,
		"free_quota":   req.FreeQuota,
		"member_quota": req.MemberQuota,
		"pay_cost":     payCost,
		"sort":         req.Sort,
		"is_enabled":   req.IsEnabled,
		"is_hot":       req.IsHot,
	}
	if req.Id > 0 {
		// 编辑：tool_key 只读，不修改
		if _, err := g.Model(consts.TableTools).Where("id", req.Id).WhereNull("deleted_at").Data(data).Update(); err != nil {
			return nil, err
		}
	} else {
		count, err := g.Model(consts.TableTools).Where("tool_key", req.ToolKey).Count()
		if err != nil {
			return nil, err
		}
		if count > 0 {
			return nil, gerror.New("工具标识已存在")
		}
		data["tool_key"] = req.ToolKey
		if _, err := g.Model(consts.TableTools).Data(data).Insert(); err != nil {
			return nil, err
		}
	}
	return &v1.ToolsSaveRes{}, nil
}

func AdminToolsToggle(ctx context.Context, id int64, field string, value int) (*v1.ToolsToggleRes, error) {
	if field != "is_enabled" && field != "is_hot" {
		return nil, gerror.New("不支持的字段")
	}
	if _, err := g.Model(consts.TableTools).Where("id", id).WhereNull("deleted_at").Data(g.Map{field: value}).Update(); err != nil {
		return nil, err
	}
	return &v1.ToolsToggleRes{}, nil
}

// ===== 数据看板 =====

func AdminDashboardStats(ctx context.Context) (*v1.DashboardStatsRes, error) {
	res := &v1.DashboardStatsRes{
		WeekTrend:    []v1.TrendItem{},
		ToolsTop:     []v1.TopItem{},
		RevenueTrend: []v1.AmountItem{},
		LevelDist:    []v1.LevelDistItem{},
		OrderDist:    []v1.DistItem{},
	}
	if c, err := g.Model(consts.TableUsers).WhereNull("deleted_at").Count(); err == nil {
		res.UserCount = int64(c)
	}
	if c, err := g.Model(consts.TableUsageLogs).Count(); err == nil {
		res.TotalUsage = int64(c)
	}
	// 今日活跃：今天有使用记录或登录过的用户数
	record, err := g.DB().GetOne(ctx,
		"SELECT COUNT(*) AS c FROM users u WHERE u.deleted_at IS NULL AND (DATE(u.last_login_at) = CURDATE() "+
			"OR EXISTS (SELECT 1 FROM tool_usage_logs l WHERE l.user_id = u.id AND DATE(l.used_at) = CURDATE()))")
	if err == nil && !record.IsEmpty() {
		res.TodayActive = record["c"].Int64()
	}
	// 7 日使用趋势（缺失日期补 0）
	trend, err := g.DB().GetAll(ctx,
		"SELECT DATE(used_at) AS d, COUNT(*) AS c FROM tool_usage_logs "+
			"WHERE used_at >= DATE_SUB(CURDATE(), INTERVAL 6 DAY) GROUP BY d")
	if err == nil {
		countByDate := map[string]int64{}
		for _, r := range trend {
			countByDate[r["d"].String()] = r["c"].Int64()
		}
		for i := 6; i >= 0; i-- {
			day := time.Now().AddDate(0, 0, -i).Format("2006-01-02")
			res.WeekTrend = append(res.WeekTrend, v1.TrendItem{Date: day, Count: countByDate[day]})
		}
	}
	// 工具使用 TOP10
	top, err := g.DB().GetAll(ctx,
		"SELECT tool_key, COUNT(*) AS c FROM tool_usage_logs GROUP BY tool_key ORDER BY c DESC LIMIT 10")
	if err == nil {
		names, _ := toolNameMap(ctx)
		for _, r := range top {
			key := r["tool_key"].String()
			res.ToolsTop = append(res.ToolsTop, v1.TopItem{ToolKey: key, Name: names[key], Count: r["c"].Int64()})
		}
	}

	// ===== T16 指标扩充：会员 / 收入 / 额度 / 分布 =====

	// 有效会员 + 等级分布：一次取出 (level_key, level_expire_at)，在 Go 层用
	// EffectiveLevelKey 归一 —— 与 C 端 EffectiveLevel 口径**完全一致**（唯一真实来源）。
	// 关键修复：level_expire_at 为 NULL 表示永久有效，必须计入有效会员
	// （旧 SQL 用 `level_expire_at IS NOT NULL` 把所有永久会员漏掉了）。
	var memberUsers []*entity.Users
	if rows, err := g.DB().GetAll(ctx,
		"SELECT level_key, level_expire_at FROM users WHERE deleted_at IS NULL"); err == nil {
		memberUsers = make([]*entity.Users, 0, len(rows))
		for _, r := range rows {
			memberUsers = append(memberUsers, &entity.Users{
				LevelKey:      r["level_key"].String(),
				LevelExpireAt: r["level_expire_at"].GTime(),
			})
		}
	}
	res.MemberCount = countActiveMembers(memberUsers)

	// 已发货订单数 + 累计收入（只统计已发货，待支付/退款不计入）
	if r, err := g.DB().GetOne(ctx,
		"SELECT COUNT(*) AS c, COALESCE(SUM(price_cents),0) AS amt FROM member_orders WHERE status = ?",
		consts.OrderStatusDelivered); err == nil && !r.IsEmpty() {
		res.OrderCount = r["c"].Int64()
		res.RevenueCents = r["amt"].Int64()
	}

	// 近 7 日收入趋势（按发货时间聚合，缺失日期补 0）
	revTrend, err := g.DB().GetAll(ctx,
		"SELECT DATE(delivered_at) AS d, COALESCE(SUM(price_cents),0) AS amt FROM member_orders "+
			"WHERE status = ? AND delivered_at >= DATE_SUB(CURDATE(), INTERVAL 6 DAY) GROUP BY d",
		consts.OrderStatusDelivered)
	if err == nil {
		amtByDate := map[string]int64{}
		for _, r := range revTrend {
			amtByDate[r["d"].String()] = r["amt"].Int64()
		}
		for i := 6; i >= 0; i-- {
			day := time.Now().AddDate(0, 0, -i).Format("2006-01-02")
			res.RevenueTrend = append(res.RevenueTrend, v1.AmountItem{Date: day, Cents: amtByDate[day]})
		}
	}

	// 额度使用：本周期免费 / 会员已用合计
	if r, err := g.DB().GetOne(ctx,
		"SELECT COALESCE(SUM(free_used),0) AS f, COALESCE(SUM(member_used),0) AS m FROM user_quota_usage"); err == nil && !r.IsEmpty() {
		res.QuotaFreeUsed = r["f"].Int64()
		res.QuotaMemberUsed = r["m"].Int64()
	}
	// 付费额度累计消耗 = Σ(累计购买 - 当前剩余)
	if v, err := g.DB().GetValue(ctx,
		"SELECT COALESCE(SUM(total_bought - times_left),0) FROM user_tool_quota"); err == nil {
		res.QuotaPaidUsed = v.Int64()
	}

	// 等级分布：按「生效等级」聚合（已过期用户归入默认等级桶），复用上面的 memberUsers。
	// 展示名：优先取等级名；默认等级无名时显示「普通用户」；其余回落 key；空 key 归「未知」。
	{
		names, _ := levelNameMap(ctx)
		dist := levelDistribution(memberUsers)
		keys := make([]string, 0, len(dist))
		for k := range dist {
			keys = append(keys, k)
		}
		// 稳定性：数量降序，数量相同按 key 升序（图表展示直观且结果确定）
		sort.Slice(keys, func(i, j int) bool {
			if dist[keys[i]] != dist[keys[j]] {
				return dist[keys[i]] > dist[keys[j]]
			}
			return keys[i] < keys[j]
		})
		for _, key := range keys {
			name := names[key]
			if name == "" {
				switch {
				case key == consts.DefaultLevelKey:
					name = "普通用户"
				case key != "":
					name = key
				default:
					name = "未知"
				}
			}
			res.LevelDist = append(res.LevelDist, v1.LevelDistItem{LevelKey: key, Name: name, Count: dist[key]})
		}
	}

	// 订单构成（会员套餐 / 次数包，仅已发货）
	orderCounts, err := g.DB().GetAll(ctx,
		"SELECT order_type, COUNT(*) AS c FROM member_orders WHERE status = ? GROUP BY order_type",
		consts.OrderStatusDelivered)
	if err == nil {
		byType := map[int]int64{}
		for _, r := range orderCounts {
			byType[r["order_type"].Int()] = r["c"].Int64()
		}
		res.OrderDist = append(res.OrderDist,
			v1.DistItem{Key: "member", Label: "会员套餐", Value: byType[consts.OrderTypeMember]},
			v1.DistItem{Key: "quota", Label: "次数包", Value: byType[consts.OrderTypeQuota]},
		)
	}
	return res, nil
}

func toolNameMap(ctx context.Context) (map[string]string, error) {
	records, err := g.Model(consts.TableTools).All()
	if err != nil {
		return nil, err
	}
	m := map[string]string{}
	for _, r := range records {
		m[r["tool_key"].String()] = r["name"].String()
	}
	return m, nil
}

// ===== 反馈管理 =====

func AdminFeedbackList(ctx context.Context, req *v1.FeedbackListReq) (*v1.FeedbackListRes, error) {
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 20
	}
	m := g.Model(consts.TableFeedbacks)
	if req.Status != nil {
		m = m.Where("status", *req.Status)
	}
	total, err := m.Count()
	if err != nil {
		return nil, err
	}
	records, err := m.Page(req.Page, req.PageSize).Order("id desc").All()
	if err != nil {
		return nil, err
	}
	list := make([]v1.FeedbackItem, 0, len(records))
	for _, r := range records {
		list = append(list, v1.FeedbackItem{
			Id:        r["id"].Int64(),
			UserId:    r["user_id"].Int64(),
			Content:   r["content"].String(),
			Contact:   r["contact"].String(),
			Status:    r["status"].Int(),
			CreatedAt: r["created_at"].String(),
		})
	}
	return &v1.FeedbackListRes{List: list, Total: total}, nil
}

func AdminFeedbackHandle(ctx context.Context, id int64) (*v1.FeedbackHandleRes, error) {
	if _, err := g.Model(consts.TableFeedbacks).Where("id", id).Data(g.Map{"status": 1}).Update(); err != nil {
		return nil, err
	}
	return &v1.FeedbackHandleRes{}, nil
}