package web

import (
	"billit/internal/database"
	"net/http"

	"github.com/labstack/echo/v4"
)

// BuyerHandlers holds db reference for buyer operations
type BuyerHandlers struct {
	db database.Service
}

// NewBuyerHandlers creates handlers with db access
func NewBuyerHandlers(db database.Service) *BuyerHandlers {
	return &BuyerHandlers{db: db}
}

// BuyerListHandler renders the /buyer page with all buyers
func (h *BuyerHandlers) BuyerListHandler(c echo.Context) error {
	userID := getUserID(c)
	buyers, err := h.db.GetAllBuyerDetails(userID)
	if err != nil {
		return RenderServerError(c, "Failed to load buyers. Please try again.")
	}
	return Render(c, BuyerListPage(buyers))
}

// BuyerCreatePageHandler renders the /buyer/create form page
func (h *BuyerHandlers) BuyerCreatePageHandler(c echo.Context) error {
	return Render(c, BuyerCreatePage())
}

// BuyerEditPageHandler renders the /buyer/edit/:id form page
func (h *BuyerHandlers) BuyerEditPageHandler(c echo.Context) error {
	id := c.Param("id")
	userID := getUserID(c)

	buyer, err := h.db.GetBuyerDetails(id, userID)
	if err != nil || buyer == nil {
		return RenderNotFound(c, "Buyer not found or you don't have access to it.")
	}
	return Render(c, BuyerEditPage(*buyer))
}

// BuyerCreateHandler handles POST /buyer/create
func (h *BuyerHandlers) BuyerCreateHandler(c echo.Context) error {
	userID := getUserID(c)
	if userID == "" {
		return c.Redirect(http.StatusFound, "/")
	}

	name := c.FormValue("name")
	if name == "" {
		return c.String(http.StatusBadRequest, "Name is required")
	}

	details := c.FormValue("details")

	_, err := h.db.CreateBuyerDetails(userID, name, details)
	if err != nil {
		return c.String(http.StatusInternalServerError, "Failed to create buyer")
	}

	return c.Redirect(http.StatusFound, "/buyer")
}

// BuyerUpdateHandler handles POST /buyer/edit/:id
func (h *BuyerHandlers) BuyerUpdateHandler(c echo.Context) error {
	userID := getUserID(c)
	if userID == "" {
		return c.Redirect(http.StatusFound, "/")
	}

	id := c.Param("id")
	name := c.FormValue("name")
	if name == "" {
		return c.String(http.StatusBadRequest, "Name is required")
	}

	details := c.FormValue("details")

	err := h.db.UpdateBuyerDetails(id, userID, name, details)
	if err != nil {
		return c.String(http.StatusInternalServerError, "Failed to update buyer")
	}

	return c.Redirect(http.StatusFound, "/buyer")
}

// BuyerDeleteHandler handles DELETE /buyer/:id
func (h *BuyerHandlers) BuyerDeleteHandler(c echo.Context) error {
	userID := getUserID(c)
	if userID == "" {
		return c.String(http.StatusUnauthorized, "Unauthorized")
	}

	id := c.Param("id")
	err := h.db.DeleteBuyerDetails(id, userID)
	if err != nil {
		return c.String(http.StatusInternalServerError, "Failed to delete buyer")
	}

	return c.NoContent(http.StatusOK)
}