package handlers

import (
	"fmt"
	"net/http"

	"shop.tonybtw.com/internal/lib"
	"shop.tonybtw.com/internal/models"
	"shop.tonybtw.com/internal/views"
)

type Checkout_Handler struct {
	ctx *lib.App_Context
}

func New_Checkout_Handler(ctx *lib.App_Context) *Checkout_Handler {
	return &Checkout_Handler{ctx: ctx}
}

func (h *Checkout_Handler) Show_Checkout(w http.ResponseWriter, r *http.Request) {
	session_id := lib.Get_Session_ID(r)
	cart_json := h.ctx.Session_Store.Get_Cart(session_id)
	cart, _ := models.Parse_Cart(cart_json)

	if len(cart) == 0 {
		lib.Redirect(w, r, "/cart")
		return
	}

	items, err := models.Get_Cart_Items_With_Details(h.ctx.DB, cart)
	if err != nil {
		http.Error(w, "Failed to load cart", http.StatusInternalServerError)
		return
	}

	total := models.Get_Cart_Total(items)
	csrf_token := lib.Get_CSRF_Token(session_id)
	cart_count := models.Count_Cart_Items(cart)

	views.Checkout(items, total, csrf_token, cart_count).Render(r.Context(), w)
}

func (h *Checkout_Handler) Create_Session(w http.ResponseWriter, r *http.Request) {
	session_id := lib.Get_Session_ID(r)
	cart_json := h.ctx.Session_Store.Get_Cart(session_id)
	cart, _ := models.Parse_Cart(cart_json)

	if len(cart) == 0 {
		lib.Redirect(w, r, "/cart")
		return
	}

	items, err := models.Get_Cart_Items_With_Details(h.ctx.DB, cart)
	if err != nil {
		http.Error(w, "Failed to load cart", http.StatusInternalServerError)
		return
	}

	var line_items []lib.Stripe_Line_Item
	for _, item := range items {
		line_items = append(line_items, lib.Stripe_Line_Item{
			Name:     fmt.Sprintf("%s (%s)", item.Name, item.Size),
			Amount:   int64(item.Price),
			Quantity: int64(item.Quantity),
		})
	}

	host := r.Host
	scheme := "http"
	if r.TLS != nil {
		scheme = "https"
	}

	success_url := fmt.Sprintf("%s://%s/success", scheme, host)
	cancel_url := fmt.Sprintf("%s://%s/cart", scheme, host)

	stripe_session, err := lib.Create_Checkout_Session(line_items, success_url, cancel_url)
	if err != nil {
		cart_count := models.Count_Cart_Items(cart)
		views.Error("Failed to create checkout session", cart_count).Render(r.Context(), w)
		return
	}

	lib.Redirect(w, r, stripe_session.URL)
}

func (h *Checkout_Handler) Show_Success(w http.ResponseWriter, r *http.Request) {
	session_id := lib.Get_Session_ID(r)
	h.ctx.Session_Store.Set_Cart(session_id, "")

	views.Success(0).Render(r.Context(), w)
}