package server

import (
	"net/http"

	"music-server/internal/backend"

	"github.com/labstack/echo/v5"
)

type DownloadHandler struct {
	releases *backend.ReleaseService
}

func NewDownloadHandler(releases *backend.ReleaseService) *DownloadHandler {
	return &DownloadHandler{releases: releases}
}

// CheckLatest godoc
// @Summary Check for latest version
// @Description Returns the latest version of the client application
// @Tags download
// @Produce json
// @Success 200 {string} string
// @Failure 502 {string} string "upstream service unavailable"
// @Router /download [get]
func (d *DownloadHandler) CheckLatest(ctx *echo.Context) error {
	latest, err := d.releases.LatestVersion(ctx.Request().Context())
	if err != nil {
		return songError(err)
	}
	return ctx.JSON(http.StatusOK, latest)
}

// ListAssetsOfLatest godoc
// @Summary List assets of latest version
// @Description Lists all assets available for the latest version
// @Tags download
// @Produce json
// @Success 200 {array} string
// @Failure 502 {string} string "upstream service unavailable"
// @Router /download/list [get]
func (d *DownloadHandler) ListAssetsOfLatest(ctx *echo.Context) error {
	assets, err := d.releases.AssetNames(ctx.Request().Context())
	if err != nil {
		return songError(err)
	}
	return ctx.JSON(http.StatusOK, assets)
}

// DownloadLatestWindows godoc
// @Summary Download latest Windows version
// @Description Redirects to download the latest Windows version
// @Tags download
// @Success 302 {string} string
// @Failure 404 {string} string "not found"
// @Failure 502 {string} string "upstream service unavailable"
// @Router /download/windows [get]
func (d *DownloadHandler) DownloadLatestWindows(ctx *echo.Context) error {
	return d.redirectToAsset(ctx, ".exe")
}

// DownloadLatestLinux godoc
// @Summary Download latest Linux version
// @Description Redirects to download the latest Linux version
// @Tags download
// @Success 302 {string} string
// @Failure 404 {string} string "not found"
// @Failure 502 {string} string "upstream service unavailable"
// @Router /download/linux [get]
func (d *DownloadHandler) DownloadLatestLinux(ctx *echo.Context) error {
	return d.redirectToAsset(ctx, ".x86_64")
}

func (d *DownloadHandler) redirectToAsset(ctx *echo.Context, suffix string) error {
	url, err := d.releases.AssetURL(ctx.Request().Context(), suffix)
	if err != nil {
		return songError(err)
	}
	return ctx.Redirect(http.StatusFound, url)
}