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;
	/**
	 * Visual skin. "modern" is the shadcn-style look; "win7" swaps in 7.css
	 * (Windows 7 Aero) and switches the window to custom frameless chrome.
	 * Each skin is a whole component tree under ui/src/app/skins/ — "modern" is
	 * shadlike/, "win7" is 7like/ — selected at bootstrap in ui/src/main.ts.
	 * The value is NOT named after its folder on purpose: it is persisted in
	 * user settings, and "win7" is also the literal class 7.scoped.css is
	 * precompiled to require, so neither can be renamed freely.
	 * Changing this needs a window reopen to take effect on the frame itself —
	 * the CSS half applies live.
	 */
	skin: "modern" | "win7";
	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";
	/**
	 * Interface scale factor, 0.5–4 in 0.1 steps (shown as 50%–400%). Works by
	 * setting the root font-size — every size in the UI is rem, so one lever
	 * scales BOTH skins whole. Replaced the 3-tier `textSize`
	 * (compact|default|large); SettingsStore.load migrates old files.
	 */
	uiScale: number;
	/** 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",
	skin: "modern",
	theme: "system",
	darkTone: "dark",
	accent: "blue",
	iconColors: "multi",
	columns: ["size", "mtime"],
	speedUnit: "MBps",
	uiScale: 1,
	transferMode: "single",
	transferConcurrency: 3,
	autoClearCompleted: true,
	editor: "builtin",
	editorApp: "",
	// autoRefresh: true,
};

export const UI_SCALE_MIN = 0.5;
export const UI_SCALE_MAX = 4;
export const UI_SCALE_STEP = 0.1;

/**
 * Clamp + snap a scale factor to the legal range and step grid. Shared by the
 * store (a hand-edited settings.json must not be able to render the UI
 * unusable), the settings service and the stepper — one definition of "valid",
 * same as effectiveConcurrency below.
 */
export function clampUiScale(value: number): number {
	if (!Number.isFinite(value)) return 1;
	const clamped = Math.min(UI_SCALE_MAX, Math.max(UI_SCALE_MIN, value));
	// snap to the step grid; toFixed strips float noise (0.7000000000000001 -> 0.7)
	return Number((Math.round(clamped / UI_SCALE_STEP) * UI_SCALE_STEP).toFixed(2));
}

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;
}