import { shimmerText } from "../../modes/theme/shimmer";
import { theme as currentTheme, type Theme } from "../../modes/theme/theme";

/** Format a millisecond duration as a coarse-grained human label. */
export function formatDuration(ms: number): string {
	const seconds = Math.max(0, Math.round(ms / 1000));
	if (seconds < 60) return `${seconds}s`;
	const minutes = Math.round(seconds / 60);
	if (minutes < 60) return `${minutes}m`;
	const hours = Math.round(minutes / 60);
	if (hours < 48) return `${hours}h`;
	const days = Math.round(hours / 24);
	return `${days}d`;
}

type ProgressBarTheme = Pick<Theme, "bold" | "fg" | "getFgAnsi">;

const unstyledProgressBarTheme: ProgressBarTheme = {
	fg(_color, text) {
		return text;
	},
	bold(text) {
		return text;
	},
	getFgAnsi() {
		return "";
	},
};

function resolveProgressBarTheme(uiTheme: ProgressBarTheme | undefined): ProgressBarTheme {
	return uiTheme ?? currentTheme ?? unstyledProgressBarTheme;
}

/**
 * Render an ASCII progress bar with a trailing percent label.
 * `fraction` is clamped to `[0, 1]`. `undefined` renders a dotted placeholder.
 */
export function renderAsciiBar(fraction: number | undefined, width = 24, uiTheme?: ProgressBarTheme): string {
	const progressBarTheme = resolveProgressBarTheme(uiTheme);
	if (fraction === undefined) return `[${shimmerText("·".repeat(width), progressBarTheme)}]`;
	const clamped = Math.min(Math.max(fraction, 0), 1);
	const filled = Math.round(clamped * width);
	const pct = Math.round(clamped * 100);
	const bar = `${"█".repeat(filled)}${"░".repeat(Math.max(0, width - filled))}`;
	return `[${shimmerText(bar, progressBarTheme)}] ${pct}%`;
}