new-api/controller/subscription.go

package controller

import (
	"encoding/json"
	"errors"
	"strconv"
	"strings"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/model"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// ---- Shared types ----

type SubscriptionPlanDTO struct {
	Plan  model.SubscriptionPlan        `json:"plan"`
	Items []model.SubscriptionPlanItem  `json:"items"`
}

type BillingPreferenceRequest struct {
	BillingPreference string `json:"billing_preference"`
}

func normalizeBillingPreference(pref string) string {
	switch strings.TrimSpace(pref) {
	case "subscription_first", "wallet_first", "subscription_only", "wallet_only":
		return strings.TrimSpace(pref)
	default:
		return "subscription_first"
	}
}

// ---- User APIs ----

func GetSubscriptionPlans(c *gin.Context) {
	var plans []model.SubscriptionPlan
	if err := model.DB.Where("enabled = ?", true).Order("sort_order desc, id desc").Find(&plans).Error; err != nil {
		common.ApiError(c, err)
		return
	}
	result := make([]SubscriptionPlanDTO, 0, len(plans))
	for _, p := range plans {
		items, _ := model.GetSubscriptionPlanItems(p.Id)
		result = append(result, SubscriptionPlanDTO{
			Plan:  p,
			Items: items,
		})
	}
	common.ApiSuccess(c, result)
}

func GetSubscriptionSelf(c *gin.Context) {
	userId := c.GetInt("id")
	settingMap, _ := model.GetUserSetting(userId, false)
	pref := normalizeBillingPreference(settingMap.BillingPreference)

	// Get all subscriptions (including expired)
	allSubscriptions, err := model.GetAllUserSubscriptions(userId)
	if err != nil {
		allSubscriptions = []model.SubscriptionSummary{}
	}

	// Get active subscriptions for backward compatibility
	activeSubscriptions, err := model.GetAllActiveUserSubscriptions(userId)
	if err != nil {
		activeSubscriptions = []model.SubscriptionSummary{}
	}

	// For backward compatibility, also return the first active subscription as "subscription"
	var summary *model.SubscriptionSummary
	if len(activeSubscriptions) > 0 {
		summary = &activeSubscriptions[0]
	}

	common.ApiSuccess(c, gin.H{
		"billing_preference":     pref,
		"subscription":           summary,              // backward compatibility (first active)
		"subscriptions":          activeSubscriptions,  // all active subscriptions
		"all_subscriptions":      allSubscriptions,     // all subscriptions including expired
	})
}

func UpdateSubscriptionPreference(c *gin.Context) {
	userId := c.GetInt("id")
	var req BillingPreferenceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.ApiErrorMsg(c, "参数错误")
		return
	}
	pref := normalizeBillingPreference(req.BillingPreference)

	user, err := model.GetUserById(userId, true)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	current := user.GetSetting()
	current.BillingPreference = pref
	user.SetSetting(current)
	if err := user.Update(false); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, gin.H{"billing_preference": pref})
}

// ---- Admin APIs ----

func AdminListSubscriptionPlans(c *gin.Context) {
	var plans []model.SubscriptionPlan
	if err := model.DB.Order("sort_order desc, id desc").Find(&plans).Error; err != nil {
		common.ApiError(c, err)
		return
	}
	result := make([]SubscriptionPlanDTO, 0, len(plans))
	for _, p := range plans {
		items, _ := model.GetSubscriptionPlanItems(p.Id)
		result = append(result, SubscriptionPlanDTO{
			Plan:  p,
			Items: items,
		})
	}
	common.ApiSuccess(c, result)
}

type AdminUpsertSubscriptionPlanRequest struct {
	Plan  model.SubscriptionPlan       `json:"plan"`
	Items []model.SubscriptionPlanItem `json:"items"`
}

func AdminCreateSubscriptionPlan(c *gin.Context) {
	var req AdminUpsertSubscriptionPlanRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.ApiErrorMsg(c, "参数错误")
		return
	}
	req.Plan.Id = 0
	if strings.TrimSpace(req.Plan.Title) == "" {
		common.ApiErrorMsg(c, "套餐标题不能为空")
		return
	}
	if req.Plan.Currency == "" {
		req.Plan.Currency = "USD"
	}
	if req.Plan.DurationUnit == "" {
		req.Plan.DurationUnit = model.SubscriptionDurationMonth
	}
	if req.Plan.DurationValue <= 0 && req.Plan.DurationUnit != model.SubscriptionDurationCustom {
		req.Plan.DurationValue = 1
	}

	if len(req.Items) == 0 {
		common.ApiErrorMsg(c, "套餐至少需要配置一个模型权益")
		return
	}

	db := model.DB
	err := db.Transaction(func(tx *gorm.DB) error {
		if err := tx.Create(&req.Plan).Error; err != nil {
			return err
		}
		items := make([]model.SubscriptionPlanItem, 0, len(req.Items))
		for _, it := range req.Items {
			if strings.TrimSpace(it.ModelName) == "" {
				continue
			}
			if it.AmountTotal <= 0 {
				continue
			}
			it.Id = 0
			it.PlanId = req.Plan.Id
			items = append(items, it)
		}
		if len(items) == 0 {
			return errors.New("无有效的模型权益配置")
		}
		return tx.Create(&items).Error
	})
	if err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, req.Plan)
}

func AdminUpdateSubscriptionPlan(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if id <= 0 {
		common.ApiErrorMsg(c, "无效的ID")
		return
	}
	var req AdminUpsertSubscriptionPlanRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.ApiErrorMsg(c, "参数错误")
		return
	}
	if strings.TrimSpace(req.Plan.Title) == "" {
		common.ApiErrorMsg(c, "套餐标题不能为空")
		return
	}
	req.Plan.Id = id
	if req.Plan.Currency == "" {
		req.Plan.Currency = "USD"
	}
	if req.Plan.DurationUnit == "" {
		req.Plan.DurationUnit = model.SubscriptionDurationMonth
	}
	if req.Plan.DurationValue <= 0 && req.Plan.DurationUnit != model.SubscriptionDurationCustom {
		req.Plan.DurationValue = 1
	}

	if len(req.Items) == 0 {
		common.ApiErrorMsg(c, "套餐至少需要配置一个模型权益")
		return
	}

	err := model.DB.Transaction(func(tx *gorm.DB) error {
		// update plan (allow zero values updates with map)
		updateMap := map[string]interface{}{
			"title":            req.Plan.Title,
			"subtitle":         req.Plan.Subtitle,
			"price_amount":     req.Plan.PriceAmount,
			"currency":         req.Plan.Currency,
			"duration_unit":    req.Plan.DurationUnit,
			"duration_value":   req.Plan.DurationValue,
			"custom_seconds":   req.Plan.CustomSeconds,
			"enabled":          req.Plan.Enabled,
			"sort_order":       req.Plan.SortOrder,
			"stripe_price_id":  req.Plan.StripePriceId,
			"creem_product_id": req.Plan.CreemProductId,
			"updated_at":       common.GetTimestamp(),
		}
		if err := tx.Model(&model.SubscriptionPlan{}).Where("id = ?", id).Updates(updateMap).Error; err != nil {
			return err
		}
		// replace items
		if err := tx.Where("plan_id = ?", id).Delete(&model.SubscriptionPlanItem{}).Error; err != nil {
			return err
		}
		items := make([]model.SubscriptionPlanItem, 0, len(req.Items))
		for _, it := range req.Items {
			if strings.TrimSpace(it.ModelName) == "" {
				continue
			}
			if it.AmountTotal <= 0 {
				continue
			}
			it.Id = 0
			it.PlanId = id
			items = append(items, it)
		}
		if len(items) == 0 {
			return errors.New("无有效的模型权益配置")
		}
		return tx.Create(&items).Error
	})
	if err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, nil)
}

func AdminDeleteSubscriptionPlan(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if id <= 0 {
		common.ApiErrorMsg(c, "无效的ID")
		return
	}
	// best practice: disable instead of hard delete to avoid breaking past orders
	if err := model.DB.Model(&model.SubscriptionPlan{}).Where("id = ?", id).Update("enabled", false).Error; err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, nil)
}

type AdminBindSubscriptionRequest struct {
	UserId int `json:"user_id"`
	PlanId int `json:"plan_id"`
}

func AdminBindSubscription(c *gin.Context) {
	var req AdminBindSubscriptionRequest
	if err := c.ShouldBindJSON(&req); err != nil || req.UserId <= 0 || req.PlanId <= 0 {
		common.ApiErrorMsg(c, "参数错误")
		return
	}
	if err := model.AdminBindSubscription(req.UserId, req.PlanId, ""); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, nil)
}

// ---- Helper: serialize provider payload safely ----

func jsonString(v any) string {
	b, _ := json.Marshal(v)
	return string(b)
}