export const DISCORD_ID = "1014549805608992901";

const LANYARD_API = `https://api.lanyard.rest/v1/users/${DISCORD_ID}`;

export const LANYARD_WS = "wss://api.lanyard.rest/socket";

export type DiscordStatus = "online" | "idle" | "dnd" | "offline";

export interface LanyardEmoji {
    name: string;
    id?: string;
    animated?: boolean;
}

export interface LanyardActivityAssets {
    large_image?: string;
    large_text?: string;
    small_image?: string;
    small_text?: string;
}

export interface LanyardActivity {
    id: string;
    name: string;
    type: number;
    state?: string | null;
    details?: string | null;
    emoji?: LanyardEmoji | null;
    timestamps?: { start?: number; end?: number } | null;
    application_id?: string | null;
    assets?: LanyardActivityAssets | null;
}

export function activityImageUrl(activity: LanyardActivity, small: boolean): string | null {
    const key = small ? activity.assets?.small_image : activity.assets?.large_image;
    if (!key) {
        return null;
    }
    if (key.startsWith("mp:")) {
        return `https://media.discordapp.net/external/${key.slice(3)}`;
    }
    if (key.startsWith("spotify:")) {
        return `https://i.scdn.co/image/${key.slice("spotify:".length)}`;
    }
    if (activity.application_id) {
        return `https://cdn.discordapp.com/app-assets/${activity.application_id}/${key}.png`;
    }
    return null;
}

export interface LanyardSpotify {
    track_id: string;
    timestamps: {
        start: number;
        end: number;
    };
    song: string;
    artist: string;
    album: string;
    album_art_url: string | null;
}

export function formatSpotifyList(value: string | null | undefined): string {
    if (!value) {
        return "";
    }
    return value
        .replace(/;/g, ",")
        .replace(/,[ \t]+,/g, ",")
        .replace(/\s{2,}/g, " ")
        .trim();
}

export function spotifyTrackUrl(trackId: string): string {
    return `https://open.spotify.com/track/${trackId}`;
}

export function discordAppIconUrl(
    applicationId: string,
    iconHash: string | null,
    size = 128,
): string | null {
    if (!iconHash) {
        return null;
    }
    const extension = iconHash.startsWith("a_") ? "gif" : "png";
    return `https://cdn.discordapp.com/app-icons/${applicationId}/${iconHash}.${extension}?size=${size}`;
}

export function discordGameUrl(gameId: string): string {
    return `https://discord.com/games/${gameId}`;
}

export interface DiscordAppInfo {
    id: string;
    name: string;
    icon: string | null;
    iconUrl: string | null;
    coverImage: string | null;
    coverUrl: string | null;
    gameId: string;
    gameUrl: string;
}

interface DiscordRpcResponse {
    id: string;
    name: string;
    icon?: string | null;
    cover_image?: string | null;
    linked_games?: Array<{ id: string }> | null;
}

export async function getDiscordAppInfo(applicationId: string): Promise<DiscordAppInfo | null> {
    if (!/^\d+$/.test(applicationId)) {
        return null;
    }
    try {
        const response = await fetch(
            `https://discord.com/api/v10/applications/${applicationId}/rpc`,
            {
                headers: { "User-Agent": "fristy.net (personal site)" },
                next: { revalidate: 86_400 },
            },
        );
        if (!response.ok) {
            return null;
        }
        const json = (await response.json()) as DiscordRpcResponse;
        const gameId = json.linked_games?.[0]?.id ?? json.id ?? applicationId;
        return {
            id: json.id ?? applicationId,
            name: json.name ?? "",
            icon: json.icon ?? null,
            iconUrl: discordAppIconUrl(applicationId, json.icon ?? null),
            coverImage: json.cover_image ?? null,
            coverUrl: json.cover_image
                ? `https://cdn.discordapp.com/app-icons/${applicationId}/${json.cover_image}.png?size=512`
                : null,
            gameId,
            gameUrl: discordGameUrl(gameId),
        };
    } catch {
        return null;
    }
}

export interface LanyardData {
    discord_user: {
        id: string;
        username: string;
        global_name: string | null;
        display_name: string | null;
        discriminator: string;
        avatar: string | null;
        bot: boolean;
    };
    activities: LanyardActivity[];
    discord_status: DiscordStatus;
    active_on_discord_desktop: boolean;
    active_on_discord_mobile: boolean;
    active_on_discord_web: boolean;
    listening_to_spotify: boolean;
    spotify: LanyardSpotify | null;
}

interface LanyardResponse {
    success: boolean;
    data: LanyardData;
}

export async function getLanyard(): Promise<LanyardData | null> {
    try {
        const response = await fetch(LANYARD_API, { next: { revalidate: 10 } });
        if (!response.ok) {
            return null;
        }
        const json = (await response.json()) as LanyardResponse;
        return json.success ? json.data : null;
    } catch {
        return null;
    }
}

export function lanyardUrl(): string {
    return LANYARD_API;
}

export function discordAvatarUrl(userId: string, avatarHash: string | null, size = 128): string {
    if (!avatarHash) {
        return `https://cdn.discordapp.com/embed/avatars/0.png?size=${size}`;
    }
    const extension = avatarHash.startsWith("a_") ? "gif" : "png";
    return `https://cdn.discordapp.com/avatars/${userId}/${avatarHash}.${extension}?size=${size}`;
}

export function discordProfileUrl(userId: string): string {
    return `https://discord.com/users/${userId}`;
}