package api

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/openteam/server/internal/pkg/resp"
	"github.com/openteam/server/internal/store"
	"github.com/shopspring/decimal"
)

// UserProfile GET /api/v1/user/profile
func (h *Handler) UserProfile(c *gin.Context) {
	u, _ := userFromContext(c)
	resp.OK(c, gin.H{"user": h.publicUser(u)})
}

// UserBalance GET /api/v1/user/balance — 余额 + 近 30 日消耗。
// 消耗扫 usage_daily（预聚合）而非 usage_logs：语义等价（usage_daily 只含 cost>0 的
// 计费行，含 canceled——canceled 请求 token 已实际计费），且不受明细保留期清理影响。
func (h *Handler) UserBalance(c *gin.Context) {
	u, _ := userFromContext(c)
	cutoff := time.Now().UTC().AddDate(0, 0, -30).Format("2006-01-02")
	var spent decimal.Decimal
	h.a.DB.Model(&store.UsageDaily{}).
		Where("user_id = ? AND date >= ?", u.ID, cutoff).
		Select("COALESCE(SUM(cost),0)").Scan(&spent)
	resp.OK(c, gin.H{
		"balance":          u.Balance,
		"spent_last_30d":   spent,
		"today":            h.todayUsage(c, u.ID),
		"models_available": h.availableModelCount(),
	})
}

func (h *Handler) availableModelCount() int64 {
	var n int64
	h.a.DB.Model(&store.Model{}).Where("enabled = ?", true).Count(&n)
	return n
}

func (h *Handler) todayUsage(c *gin.Context, userID uint64) gin.H {
	var requests int64
	var tokens int64
	var cost decimal.Decimal
	today := time.Now().UTC().Format("2006-01-02")
	h.a.DB.Model(&store.UsageDaily{}).
		Where("user_id = ? AND date = ?", userID, today).
		Select("COALESCE(SUM(requests),0), COALESCE(SUM(input_tokens+output_tokens+cache_read_tokens),0), COALESCE(SUM(cost),0)").
		Row().Scan(&requests, &tokens, &cost)
	return gin.H{"requests": requests, "tokens": tokens, "cost": cost}
}

// UserModels GET /api/v1/user/models — 控制台可用模型列表（无需 API Key）。
// 仅返回启用的模型且至少绑定到一个启用且健康的渠道，与 /v1/models 口径一致。
func (h *Handler) UserModels(c *gin.Context) {
	var names []string
	if err := h.a.DB.Table("models").
		Joins("JOIN channel_model_bindings ON channel_model_bindings.model_id = models.id").
		Joins("JOIN channels ON channels.id = channel_model_bindings.channel_id").
		Where("models.enabled = ? AND channels.enabled = ? AND channels.health_status = ?",
			true, true, store.ChannelHealthHealthy).
		Distinct("models.name").
		Order("models.sort ASC, models.id ASC").
		Pluck("models.name", &names).Error; err != nil {
		resp.Fail(c, http.StatusInternalServerError, "failed to load models")
		return
	}
	if names == nil {
		names = []string{}
	}
	resp.OK(c, gin.H{"items": names})
}