package handlers

import (
	"net/http"

	"github.com/labstack/echo/v4"

	"github.com/treytartt/casera-api/internal/apperrors"
	"github.com/treytartt/casera-api/internal/middleware"
	"github.com/treytartt/casera-api/internal/models"
	"github.com/treytartt/casera-api/internal/services"
)

// SubscriptionHandler handles subscription-related HTTP requests
type SubscriptionHandler struct {
	subscriptionService *services.SubscriptionService
}

// NewSubscriptionHandler creates a new subscription handler
func NewSubscriptionHandler(subscriptionService *services.SubscriptionService) *SubscriptionHandler {
	return &SubscriptionHandler{subscriptionService: subscriptionService}
}

// GetSubscription handles GET /api/subscription/
func (h *SubscriptionHandler) GetSubscription(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	subscription, err := h.subscriptionService.GetSubscription(user.ID)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, subscription)
}

// GetSubscriptionStatus handles GET /api/subscription/status/
func (h *SubscriptionHandler) GetSubscriptionStatus(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	status, err := h.subscriptionService.GetSubscriptionStatus(user.ID)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, status)
}

// GetUpgradeTrigger handles GET /api/subscription/upgrade-trigger/:key/
func (h *SubscriptionHandler) GetUpgradeTrigger(c echo.Context) error {
	key := c.Param("key")

	trigger, err := h.subscriptionService.GetUpgradeTrigger(key)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, trigger)
}

// GetAllUpgradeTriggers handles GET /api/subscription/upgrade-triggers/
func (h *SubscriptionHandler) GetAllUpgradeTriggers(c echo.Context) error {
	triggers, err := h.subscriptionService.GetAllUpgradeTriggers()
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, triggers)
}

// GetFeatureBenefits handles GET /api/subscription/features/
func (h *SubscriptionHandler) GetFeatureBenefits(c echo.Context) error {
	benefits, err := h.subscriptionService.GetFeatureBenefits()
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, benefits)
}

// GetPromotions handles GET /api/subscription/promotions/
func (h *SubscriptionHandler) GetPromotions(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	promotions, err := h.subscriptionService.GetActivePromotions(user.ID)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, promotions)
}

// ProcessPurchase handles POST /api/subscription/purchase/
func (h *SubscriptionHandler) ProcessPurchase(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	var req services.ProcessPurchaseRequest
	if err := c.Bind(&req); err != nil {
		return apperrors.BadRequest("error.invalid_request")
	}

	var subscription *services.SubscriptionResponse
	var err error

	switch req.Platform {
	case "ios":
		// StoreKit 2 uses transaction_id, StoreKit 1 uses receipt_data
		if req.TransactionID == "" && req.ReceiptData == "" {
			return apperrors.BadRequest("error.receipt_data_required")
		}
		subscription, err = h.subscriptionService.ProcessApplePurchase(user.ID, req.ReceiptData, req.TransactionID)
	case "android":
		if req.PurchaseToken == "" {
			return apperrors.BadRequest("error.purchase_token_required")
		}
		subscription, err = h.subscriptionService.ProcessGooglePurchase(user.ID, req.PurchaseToken, req.ProductID)
	}

	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"message":      "message.subscription_upgraded",
		"subscription": subscription,
	})
}

// CancelSubscription handles POST /api/subscription/cancel/
func (h *SubscriptionHandler) CancelSubscription(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	subscription, err := h.subscriptionService.CancelSubscription(user.ID)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"message":      "message.subscription_cancelled",
		"subscription": subscription,
	})
}

// RestoreSubscription handles POST /api/subscription/restore/
func (h *SubscriptionHandler) RestoreSubscription(c echo.Context) error {
	user := c.Get(middleware.AuthUserKey).(*models.User)

	var req services.ProcessPurchaseRequest
	if err := c.Bind(&req); err != nil {
		return apperrors.BadRequest("error.invalid_request")
	}

	// Same logic as ProcessPurchase - validates receipt/token and restores
	var subscription *services.SubscriptionResponse
	var err error

	switch req.Platform {
	case "ios":
		subscription, err = h.subscriptionService.ProcessApplePurchase(user.ID, req.ReceiptData, req.TransactionID)
	case "android":
		subscription, err = h.subscriptionService.ProcessGooglePurchase(user.ID, req.PurchaseToken, req.ProductID)
	}

	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"message":      "message.subscription_restored",
		"subscription": subscription,
	})
}