import type { Theme } from "@earendil-works/pi-coding-agent";
import { truncateToWidth, visibleWidth } from "@earendil-works/pi-tui";

export function clamp(value: number, min: number, max: number): number {
  return Math.min(max, Math.max(min, value));
}

export function truncateDisplayText(text: string, width: number): string {
  if (width <= 0) return "";
  return truncateToWidth(text, width, "…", true);
}

export function joinPartsToWidth(parts: string[], width: number): string {
  let line = "";
  for (const part of parts) {
    if (!part) continue;
    const next = line + part;
    if (visibleWidth(next) <= width) {
      line = next;
      continue;
    }
    return truncateToWidth(line || part, width, "…", true);
  }
  return truncateToWidth(line, width, "…", true);
}

export function appendRightAlignedAdaptiveHint(
  left: string,
  width: number,
  theme: Theme,
  candidates: string[],
): string {
  if (width <= 0) return "";
  const leftWidth = visibleWidth(left);
  for (const candidate of candidates) {
    const hint = theme.fg("dim", ` ${candidate}`);
    const hintWidth = visibleWidth(hint);
    if (hintWidth > width) continue;
    if (leftWidth + hintWidth <= width) {
      return left + " ".repeat(Math.max(0, width - leftWidth - hintWidth)) + hint;
    }
    const availableLeftWidth = Math.max(0, width - hintWidth);
    const truncatedLeft = truncateToWidth(left, availableLeftWidth, "…", true);
    const truncatedLeftWidth = visibleWidth(truncatedLeft);
    return truncatedLeft + " ".repeat(Math.max(0, width - truncatedLeftWidth - hintWidth)) + hint;
  }
  return truncateToWidth(left, width, "…", true);
}

export function getTuiSize(tui: { terminal?: { columns?: number; rows?: number } }): { width: number; height: number } {
  return {
    width: tui.terminal?.columns ?? process.stdout.columns ?? 120,
    height: tui.terminal?.rows ?? process.stdout.rows ?? 40,
  };
}