package link

import (
	"encoding/json"
	"github.com/jackc/pgx/v4/pgxpool"
	"github.com/labstack/echo/v4"
	"net/http"
)

func creationHandler(c echo.Context, pool *pgxpool.Pool) error {
	var model CreationModel
	if err := json.NewDecoder(c.Request().Body).Decode(&model); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid data format.")
	}

	entity, err := model.MapModelToEntity()
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid URL.")
	}

	rep := PgRepository{pool: pool}

	link, err := rep.FindById(entity.Id)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError)
	}

	if link != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Link with given ID already exists.")
	}

	if err = rep.Save(entity); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError)
	}

	return c.NoContent(http.StatusCreated)
}

func redirectHandler(c echo.Context, pool *pgxpool.Pool) error {
	linkId := c.Param("id")

	rep := PgRepository{pool: pool}

	link, err := rep.FindById(linkId)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError)
	}

	if link == nil {
		return echo.NewHTTPError(http.StatusNotFound, "Link with given ID was not found.")
	}

	return c.Redirect(http.StatusSeeOther, link.RedirectURL.String())
}

func AddHandlers(s *echo.Echo, pool *pgxpool.Pool) {
	s.POST("", func(ctx echo.Context) error {
		return creationHandler(ctx, pool)
	})
	s.GET("/:id", func(ctx echo.Context) error {
		return redirectHandler(ctx, pool)
	})
}