/**
 * The server's settings: those read from `GERBEUR_*` environment variables,
 * with their defaults, and the fixed limits the backend applies.
 *
 * @module
 */

/** The port the server listens on (`GERBEUR_PORT`, default 8000). */
export const PORT: number = Number(Deno.env.get("GERBEUR_PORT")) || 8000;
/**
 * The SMTP server mail is sent through, as an `smtps://` URL
 * (`GERBEUR_SMTPS_URL`). Empty disables email.
 */
export const SMTPS_URL: string = Deno.env.get("GERBEUR_SMTPS_URL")?.trim() ||
  "";
/** The sender address of outgoing mail (`GERBEUR_FROM_EMAIL`). */
export const FROM_EMAIL: string = Deno.env.get("GERBEUR_FROM_EMAIL")?.trim() ||
  "";

const DEFAULT_WELCOME_EMAIL_BODY = `# Welcome to {{site_name}}!

Hi **{{username}}**,

Your account has been created successfully. Welcome aboard!`;

/**
 * The Markdown body of the welcome email (`GERBEUR_WELCOME_EMAIL_BODY`), with
 * `{{site_name}}` and `{{username}}` placeholders.
 */
export const WELCOME_EMAIL_BODY: string =
  Deno.env.get("GERBEUR_WELCOME_EMAIL_BODY")?.trim() ||
  DEFAULT_WELCOME_EMAIL_BODY;
/** The key tokens are signed with (`GERBEUR_JWT_SECRET`). Required. */
export const JWT_SECRET: string = Deno.env.get("GERBEUR_JWT_SECRET")?.trim() ||
  "";
/**
 * The network interface the server binds to (`GERBEUR_LISTEN_HOST`). Defaults
 * to 0.0.0.0 so Docker port-forwarding works out of the box; 127.0.0.1
 * restricts it to loopback.
 */
export const LISTEN_HOST: string = Deno.env.get("GERBEUR_LISTEN_HOST") ||
  "0.0.0.0";
/**
 * The server's public-facing URL (`GERBEUR_PUBLIC_URL`), without a trailing
 * slash — used for CORS, WebSocket origin checks, email links, and OG image
 * URLs. Behind a reverse proxy, set it to the externally-visible URL (e.g.
 * https://example.com). Defaults to http://localhost:PORT for local
 * development.
 */
export const PUBLIC_URL: string =
  Deno.env.get("GERBEUR_PUBLIC_URL")?.trim().replace(/\/$/, "") ||
  `http://localhost:${PORT}`;
/**
 * The frontend's URL (`GERBEUR_FRONTEND_URL`). In single-container deployments
 * the API serves the frontend, so it defaults to {@link PUBLIC_URL}; set it
 * when the frontend runs on a separate host or port (e.g. Vite dev server or a
 * CDN origin).
 */
export const FRONTEND_URL: string =
  Deno.env.get("GERBEUR_FRONTEND_URL")?.trim() || PUBLIC_URL;
/**
 * The SQLite database file (`GERBEUR_DB_PATH`). Overridable so the test suite
 * can run against a throwaway database (see api/test/setup.ts).
 */
export const DB_PATH: string = Deno.env.get("GERBEUR_DB_PATH") ||
  "api/sql/gerbeur.db";

// Upload/files
/**
 * The directory uploads are stored under (`GERBEUR_UPLOADS_DIR`), one
 * subdirectory per kind.
 */
export const UPLOADS_DIR: string = Deno.env.get("GERBEUR_UPLOADS_DIR") ||
  "api/uploads";
/** Where file dumps are stored. */
export const DUMPS_DIR = `${UPLOADS_DIR}/dumps`;
/** Where avatars are stored. */
export const AVATARS_DIR = `${UPLOADS_DIR}/avatars`;
/** Where playlist cover images are stored. */
export const PLAYLIST_IMAGES_DIR = `${UPLOADS_DIR}/playlist-images`;
/** Where images pasted into chat, comments and descriptions are stored. */
export const ATTACHMENTS_DIR = `${UPLOADS_DIR}/attachments`;
/** Where custom dump thumbnails are stored. */
export const THUMBNAILS_DIR = `${UPLOADS_DIR}/thumbnails`;

/** The largest image upload accepted: 5 MB. */
export const MAX_IMAGE_SIZE_BYTES = 5 * 1024 * 1024;
/** The image types accepted for avatars, covers, thumbnails and attachments. */
export const ALLOWED_IMAGE_MIMES: Set<string> = new Set([
  "image/jpeg",
  "image/png",
  "image/gif",
  "image/webp",
]);

/** The MIME type prefixes a file dump may have. */
export const DUMP_ALLOWED_MIME_PREFIXES: string[] = [
  "text/",
  "image/",
  "video/",
  "audio/",
];
/** The exact MIME types a file dump may have, beyond the prefixes. */
export const DUMP_ALLOWED_MIME_TYPES: Set<string> = new Set([
  "application/pdf",
  "application/json",
  "application/zip",
  "application/x-zip-compressed",
  "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
  "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
  "application/vnd.openxmlformats-officedocument.presentationml.presentation",
  "application/msword",
  "application/vnd.ms-excel",
  "application/vnd.ms-powerpoint",
]);

// Pagination
/** The page size when a request names none. */
export const PAGINATION_DEFAULT_LIMIT = 20;
/** The largest page size a request may ask for. */
export const PAGINATION_MAX_LIMIT = 100;

// Startup housekeeping
/** How long an attachment nothing links to is kept before startup purges it. */
export const ORPHANED_ATTACHMENTS_RETENTION_HOURS = 1;
/** How long an unused invite is kept before startup purges it. */
export const UNUSED_INVITES_RETENTION_DAYS = 7;

// SEO/OG
/** The site's name (`GERBEUR_SITE_NAME`), in page titles, OG tags and mail. */
export const OG_SITE_NAME: string = Deno.env.get("GERBEUR_SITE_NAME") ||
  "gerbeur";

/**
 * The emoji the favicon set and app header logo are generated from
 * (`GERBEUR_SITE_EMOJI`). Applied at runtime (server startup and index.html
 * injection), so changing it only needs a restart — no rebuild.
 */
export const SITE_EMOJI: string = Deno.env.get("GERBEUR_SITE_EMOJI") || "🚚";

/**
 * A Bandcamp playback path:
 * - `"embed"` — the bandcamp.com iframe (cannot autoplay)
 * - `"native"` — resolve the page's mp3 streams and play them in the app's own
 *   player, which autoplays and supports albums as a queue
 */
export type BandcampPlayer = "embed" | "native";
/**
 * The Bandcamp playback path the frontend uses (`GERBEUR_BANDCAMP_PLAYER`).
 * Anything unrecognised falls back to `"embed"`, so a typo degrades safely.
 */
export const BANDCAMP_PLAYER: BandcampPlayer =
  Deno.env.get("GERBEUR_BANDCAMP_PLAYER")?.trim() === "native"
    ? "native"
    : "embed";

/**
 * The background color of generated icons and the manifest. Mirrors the
 * hard-coded theme-color in index.html.
 */
export const THEME_COLOR = "#111827";

const rawOrigins = Deno.env.get("GERBEUR_ALLOWED_ORIGINS") ?? "";
/**
 * The origins CORS and the WebSocket accept: {@link PUBLIC_URL},
 * {@link FRONTEND_URL} and the comma-separated `GERBEUR_ALLOWED_ORIGINS`.
 */
export const ALLOWED_ORIGINS: string[] = Array.from(
  new Set([
    PUBLIC_URL,
    // FRONTEND_URL is auto-included so the separate-frontend case only needs
    // GERBEUR_FRONTEND_URL — no need to repeat it in GERBEUR_ALLOWED_ORIGINS.
    FRONTEND_URL,
    ...rawOrigins.split(",").map((o) => o.trim()).filter(Boolean),
  ]),
);