package forge

import (
	"encoding/json"
	"fmt"
	"net/http"
)

var _ Forger = (*GitHub)(nil)

type GitHub struct {
	Owner string
	Repo  string
}

type GitHubRelease struct {
	TagName string `json:"tag_name"`
	Assets  []struct {
		Name               string `json:"name"`
		BrowserDownloadURL string `json:"browser_download_url"`
	} `json:"assets"`
}

func NewGitHub(uri string) (GitHub, error) {
	var g GitHub
	_, paths, err := splitURI(uri)
	if err != nil {
		return g, err
	}
	g.Owner = paths[0]
	g.Repo = paths[1]
	return g, nil
}

func (g GitHub) Name() string {
	return g.Repo
}

func (g GitHub) Latest() (Release, error) {
	var release Release

	var r GitHubRelease
	u := fmt.Sprintf("https://api.github.com/repos/%s/%s/releases/latest", g.Owner, g.Repo)
	res, err := http.Get(u)
	if err != nil {
		return release, err
	}
	defer res.Body.Close()

	if err := json.NewDecoder(res.Body).Decode(&r); err != nil {
		return release, err
	}

	release.Name = r.TagName
	for _, a := range r.Assets {
		release.Assets = append(release.Assets, Asset{
			Name:        a.Name,
			DownloadURL: a.BrowserDownloadURL,
		})
	}

	return release, nil
}