import type { RakazoDesktopBrowserBounds } from "@rakazo/contracts";

/** Only plain http(s) pages load in the in-app browser; no files, schemes or URL credentials. */
export function previewUrl(value: unknown): string | null {
  if (typeof value !== "string" || value.length > 8192) return null;
  try {
    const url = new URL(value);
    if (url.protocol !== "http:" && url.protocol !== "https:") return null;
    if (url.username || url.password) return null;
    return url.toString();
  } catch {
    return null;
  }
}

/**
 * Renderer-reported CSS-pixel bounds, converted to window DIPs and clamped to the content area
 * so a compromised renderer cannot place the view outside the panel it reserved.
 */
export function previewBounds(
  value: unknown,
  content: { width: number; height: number },
  zoomFactor = 1,
): RakazoDesktopBrowserBounds | null {
  if (!value || typeof value !== "object") return null;
  const raw = value as Record<string, unknown>;
  const numbers = [raw.x, raw.y, raw.width, raw.height];
  if (!numbers.every((n) => typeof n === "number" && Number.isFinite(n))) return null;
  const scale = Number.isFinite(zoomFactor) && zoomFactor > 0 ? zoomFactor : 1;
  const [x, y, width, height] = (numbers as number[]).map((n) => Math.round(n * scale)) as [
    number,
    number,
    number,
    number,
  ];
  const left = Math.min(Math.max(0, x), content.width);
  const top = Math.min(Math.max(0, y), content.height);
  const right = Math.min(Math.max(left, x + width), content.width);
  const bottom = Math.min(Math.max(top, y + height), content.height);
  if (right - left < 1 || bottom - top < 1) return null;
  return { x: left, y: top, width: right - left, height: bottom - top };
}

export type PreviewShortcut = "reload" | "hard-reload" | "back" | "forward" | "devtools";

/** Browser keyboard shortcuts while focus is inside the page. */
export function previewShortcut(
  input: {
    type: string;
    key: string;
    control: boolean;
    meta: boolean;
    alt: boolean;
    shift: boolean;
  },
  platform: string,
): PreviewShortcut | null {
  if (input.type !== "keyDown") return null;
  const mod = platform === "darwin" ? input.meta : input.control;
  const key = input.key.length === 1 ? input.key.toLowerCase() : input.key;
  if (key === "F5") return input.shift ? "hard-reload" : "reload";
  if (key === "F12") return "devtools";
  if (mod && key === "r") return input.shift ? "hard-reload" : "reload";
  if (mod && input.alt && key === "i") return "devtools";
  if (platform === "darwin" ? input.meta && !input.alt : input.alt && !input.control) {
    if (key === (platform === "darwin" ? "[" : "ArrowLeft")) return "back";
    if (key === (platform === "darwin" ? "]" : "ArrowRight")) return "forward";
  }
  return null;
}

/** Load failures worth showing; an aborted load (-3) is a superseded navigation, not an error. */
export function previewLoadError(errorCode: number, description: string): string | null {
  if (errorCode === -3 || errorCode === 0) return null;
  return description || `Load failed (${errorCode})`;
}