export type EntryType = "file" | "dir" | "symlink";

export interface FileEntry {
	name: string;
	path: string; // absolute path on its filesystem
	type: EntryType;
	size: number; // bytes
	mtime: number; // epoch milliseconds
	mode: number; // permission bits only (masked & 0o7777)
	owner?: string; // resolved name when the provider knows it
	group?: string;
}

/** Optional file-list columns (Name is always shown). */
export type ColumnKey = "size" | "mtime" | "kind" | "rights" | "owner" | "group";

/** Every RPC response uses this envelope; errors never cross the bridge as exceptions. */
export type Result<T = object> = ({ ok: true } & T) | { ok: false; error: string };

export type AuthConfig =
	| { kind: "password"; password: string }
	| { kind: "key"; privateKeyPath: string; passphrase?: string }
	| { kind: "agent" };

export interface ConnectionConfig {
	host: string;
	port: number;
	username: string;
	auth: AuthConfig;
	initialPath?: string | null;
}

export interface SavedConnection extends ConnectionConfig {
	id: string;
	stackId: string | null;
	name: string;
	/** Other-panel local dir applied when that panel is local and untouched. */
	localDir?: string | null;
}

/** A named group of connections that can be opened together as tabs. */
export interface Stack {
	id: string;
	name: string;
	/** Collapsed in the connection-manager list (UI state, persisted). */
	collapsed?: boolean;
}

/** A concrete host alias resolved from ~/.ssh/config (read-only). */
export interface SshConfigHost {
	name: string; // the Host alias as written
	hostname: string; // resolved HostName (defaults to alias)
	port: number;
	username: string;
	identityFile?: string; // first existing IdentityFile, absolute path
	unsupported?: "proxy"; // ProxyJump/ProxyCommand present — direct connect can't work
}

export interface ConnectionsFile {
	version: 2;
	stacks: Stack[];
	connections: SavedConnection[];
}

/** UI languages the app ships translations for. */
export type SupportedLocale = "en" | "es" | "eu" | "fr" | "de" | "zh" | "ja";

export type AccentTone =
	| "graphite"
	| "blue"
	| "indigo"
	| "purple"
	| "rose"
	| "orange"
	| "green"
	| "teal";

export interface AppSettings {
	/** UI language; "system" resolves to the OS locale (fallback English). */
	locale: "system" | SupportedLocale;
	theme: "system" | "light" | "dark";
	/** Dark appearance: grey ("dark") or near-black AMOLED ("darker"). */
	darkTone: "dark" | "darker";
	/** Accent tone for chrome and selection tint; graphite = neutral zinc. */
	accent: AccentTone;
	/** File-list icons: plain neutral glyphs, or per-category glyphs and colors. */
	iconColors: "plain" | "multi";
	/** Visible optional file-list columns (both panels; Name always shows). */
	columns: ColumnKey[];
	speedUnit: "MBps" | "Mbps";
	/** Size of the panel interface: file list, path bar, header controls. */
	textSize: "compact" | "default" | "large";
	/** Run transfer jobs one at a time, or several in parallel. */
	transferMode: "single" | "multi";
	/** How many jobs run at once when transferMode is "multi". */
	transferConcurrency: number;
	/** Remove completed transfers from the list automatically. */
	autoClearCompleted: boolean;
	/** Edit files with the built-in editor or an external application. */
	editor: "builtin" | "custom";
	/** Full path to the external editor .app; empty = OS default application. */
	editorApp: string;
	// Auto-refresh the active tab's panels (local watched, remote polled). Always
	// on for now; uncomment (+ the settings.service and tab-bar breadcrumbs, and
	// gate the poll/watch in panels.service) to expose a toggle later.
	// autoRefresh: boolean;
}

export const DEFAULT_SETTINGS: AppSettings = {
	locale: "system",
	theme: "system",
	darkTone: "dark",
	accent: "blue",
	iconColors: "multi",
	columns: ["size", "mtime"],
	speedUnit: "MBps",
	textSize: "default",
	transferMode: "single",
	transferConcurrency: 3,
	autoClearCompleted: true,
	editor: "builtin",
	editorApp: "",
	// autoRefresh: true,
};

export function effectiveConcurrency(settings: AppSettings): number {
	if (settings.transferMode === "single") return 1;
	return Math.max(1, Math.min(8, Math.round(settings.transferConcurrency) || 1));
}

export type TransferState =
	| "queued"
	| "scanning"
	| "running"
	| "completed"
	| "failed"
	| "cancelled";

export interface TransferSnapshot {
	id: string;
	name: string; // display name (basename of source)
	srcSessionId: string;
	srcPath: string;
	dstSessionId: string;
	dstDir: string;
	state: TransferState;
	totalFiles: number;
	totalBytes: number;
	doneFiles: number;
	doneBytes: number;
	currentFile: string;
	currentFileBytes: number;
	currentFileTotal: number;
	error?: string;
}