package zed:extension;

world extension {
    use github.{github-release, github-release-options};
    use platform.{os, architecture};

    export init-extension: func();

    enum downloaded-file-type {
        gzip,
        gzip-tar,
        zip,
        uncompressed,
    }

    variant language-server-installation-status {
        checking-for-update,
        downloaded,
        downloading,
        cached,
        failed(string),
    }

    /// Gets the current operating system and architecture
    import current-platform: func() -> tuple<os, architecture>;

    /// Get the path to the node binary used by Zed.
    import node-binary-path: func() -> result<string, string>;

    /// Gets the latest version of the given NPM package.
    import npm-package-latest-version: func(package-name: string) -> result<string, string>;

    /// Returns the installed version of the given NPM package, if it exists.
    import npm-package-installed-version: func(package-name: string) -> result<option<string>, string>;

    /// Installs the specified NPM package.
    import npm-install-package: func(package-name: string, version: string) -> result<_, string>;

    /// Gets the latest release for the given GitHub repository.
    import latest-github-release: func(repo: string, options: github-release-options) -> result<github-release, string>;

    /// Downloads a file from the given url, and saves it to the given filename within the extension's
    /// working directory. Extracts the file according to the given file type.
    import download-file: func(url: string, output-filename: string, file-type: downloaded-file-type) -> result<_, string>;

    /// Updates the installation status for the given language server.
    import set-language-server-installation-status: func(language-server-name: string, status: language-server-installation-status);

    type env-vars = list<tuple<string, string>>;

    record command {
        command: string,
        args: list<string>,
        env: env-vars,
    }

    resource worktree {
        read-text-file: func(path: string) -> result<string, string>;
        which: func(binary-name: string) -> option<string>;
        shell-env: func() -> env-vars;
    }

    record language-server-config {
        name: string,
        language-name: string,
    }

    export language-server-command: func(config: language-server-config, worktree: borrow<worktree>) -> result<command, string>;
    export language-server-initialization-options: func(config: language-server-config, worktree: borrow<worktree>) -> result<option<string>, string>;
}