package domain

import (
	"path"
	"strings"

	http "github.com/valyala/fasthttp"
)

// Provider represent 3rd party RelMeAuth provider.
type Provider struct {
	Scopes       []string
	AuthURL      string
	ClientID     string
	ClientSecret string
	Name         string
	Photo        string
	RedirectURL  string
	TokenURL     string
	UID          string
	URL          string
}

//nolint: gochecknoglobals
var (
	DefaultProviderDirect = Provider{
		AuthURL:     "/authorize",
		Name:        "IndieAuth",
		Photo:       path.Join("static", "icon.svg"),
		RedirectURL: path.Join("callback"),
		Scopes:      []string{},
		TokenURL:    "/token",
		UID:         "direct",
		URL:         "/",
	}

	DefaultProviderTwitter = Provider{
		AuthURL:     "https://twitter.com/i/oauth2/authorize",
		Name:        "Twitter",
		Photo:       path.Join("static", "providers", "twitter.svg"),
		RedirectURL: path.Join("callback", "twitter"),
		Scopes: []string{
			"tweet.read",
			"users.read",
		},
		TokenURL: "https://api.twitter.com/2/oauth2/token",
		UID:      "twitter",
		URL:      "https://twitter.com/",
	}

	DefaultProviderGitHub = Provider{
		AuthURL:     "https://github.com/login/oauth/authorize",
		Name:        "GitHub",
		Photo:       path.Join("static", "providers", "github.svg"),
		RedirectURL: path.Join("callback", "github"),
		Scopes: []string{
			"read:user",
			"user:email",
		},
		TokenURL: "https://github.com/login/oauth/access_token",
		UID:      "github",
		URL:      "https://github.com/",
	}

	DefaultProviderGitLab = Provider{
		AuthURL:     "https://gitlab.com/oauth/authorize",
		Name:        "GitLab",
		Photo:       path.Join("static", "providers", "gitlab.svg"),
		RedirectURL: path.Join("callback", "gitlab"),
		Scopes: []string{
			"read_user",
		},
		TokenURL: "https://gitlab.com/oauth/token",
		UID:      "gitlab",
		URL:      "https://gitlab.com/",
	}

	DefaultProviderMastodon = Provider{
		AuthURL:     "https://mstdn.io/oauth/authorize",
		Name:        "Mastodon",
		Photo:       path.Join("static", "providers", "mastodon.svg"),
		RedirectURL: path.Join("callback", "mastodon"),
		Scopes: []string{
			"read:accounts",
		},
		TokenURL: "https://mstdn.io/oauth/token",
		UID:      "mastodon",
		URL:      "https://mstdn.io/",
	}
)

// AuthCodeURL returns URL for authorize user in RelMeAuth client.
func (p Provider) AuthCodeURL(state string) *URL {
	u := http.AcquireURI()
	u.Update(p.AuthURL)

	for k, v := range map[string]string{
		"client_id":     p.ClientID,
		"redirect_uri":  p.RedirectURL,
		"response_type": "code",
		"scope":         strings.Join(p.Scopes, " "),
		"state":         state,
	} {
		u.QueryArgs().Set(k, v)
	}

	return &URL{URI: u}
}