/**
 * Layout für Content-Blöcke (z. B. Markdown): Grid-Spalten (1–12) und Abstand.
 * Entspricht component_layout im CMS (desktop/tablet/mobile = Breite in 12tel, spaceBottom = rem).
 */

export type BlockLayout = {
  /** Breite auf Desktop (1–12), z. B. "8" = 8/12. */
  desktop?:
    | "1"
    | "2"
    | "3"
    | "4"
    | "5"
    | "6"
    | "7"
    | "8"
    | "9"
    | "10"
    | "11"
    | "12";
  /** Breite auf Tablet (1–12). */
  tablet?:
    | "1"
    | "2"
    | "3"
    | "4"
    | "5"
    | "6"
    | "7"
    | "8"
    | "9"
    | "10"
    | "11"
    | "12";
  /** Breite auf Mobile (1–12), Default 12. */
  mobile?:
    | "1"
    | "2"
    | "3"
    | "4"
    | "5"
    | "6"
    | "7"
    | "8"
    | "9"
    | "10"
    | "11"
    | "12";
  /** Abstand nach unten (rem): 0, 0.5, 1, 1.5, 2. */
  spaceBottom?: 0 | 0.5 | 1 | 1.5 | 2;
  /** true = Block fullwidth aus dem Grid ausbrechen (viewport-breit). */
  breakout?: boolean;
};

const COL_SPAN: Record<string, string> = {
  "1": "col-span-1",
  "2": "col-span-2",
  "3": "col-span-3",
  "4": "col-span-4",
  "5": "col-span-5",
  "6": "col-span-6",
  "7": "col-span-7",
  "8": "col-span-8",
  "9": "col-span-9",
  "10": "col-span-10",
  "11": "col-span-11",
  "12": "col-span-12",
};

const MD_COL_SPAN: Record<string, string> = {
  "1": "md:col-span-1",
  "2": "md:col-span-2",
  "3": "md:col-span-3",
  "4": "md:col-span-4",
  "5": "md:col-span-5",
  "6": "md:col-span-6",
  "7": "md:col-span-7",
  "8": "md:col-span-8",
  "9": "md:col-span-9",
  "10": "md:col-span-10",
  "11": "md:col-span-11",
  "12": "md:col-span-12",
};

const LG_COL_SPAN: Record<string, string> = {
  "1": "lg:col-span-1",
  "2": "lg:col-span-2",
  "3": "lg:col-span-3",
  "4": "lg:col-span-4",
  "5": "lg:col-span-5",
  "6": "lg:col-span-6",
  "7": "lg:col-span-7",
  "8": "lg:col-span-8",
  "9": "lg:col-span-9",
  "10": "lg:col-span-10",
  "11": "lg:col-span-11",
  "12": "lg:col-span-12",
};

const SPACE_BOTTOM: Record<number, string> = {
  0: "mb-0",
  0.5: "mb-2", // 0.5rem
  1: "mb-4", // 1rem
  1.5: "mb-6", // 1.5rem
  2: "mb-8", // 2rem
};

/**
 * Gibt Tailwind-Klassen für das Block-Layout zurück (12-Spalten-Grid + Abstand).
 * Parent muss grid grid-cols-12 haben.
 */
/**
 * Gibt Tailwind-Klassen für den Block-Inhalt zurück.
 * Bei breakout: true nur w-full + Abstand (Spalten/Wrapper kommen von außen).
 */
export function getBlockLayoutClasses(
  layout: BlockLayout | undefined | null,
): string {
  if (!layout || typeof layout !== "object") {
    return "col-span-12 mb-4";
  }
  const breakout = layout.breakout === true;
  const sb =
    typeof layout.spaceBottom === "number"
      ? layout.spaceBottom
      : Number(layout.spaceBottom);
  const spaceClass = SPACE_BOTTOM[sb as keyof typeof SPACE_BOTTOM] ?? "mb-4";

  if (breakout) {
    return "w-full";
  }

  const mobile = String(layout.mobile ?? "12");
  const tablet = layout.tablet != null ? String(layout.tablet) : undefined;
  const desktop = layout.desktop != null ? String(layout.desktop) : undefined;

  const parts: string[] = [
    COL_SPAN[mobile] ?? "col-span-12",
    tablet ? (MD_COL_SPAN[tablet] ?? "") : "",
    desktop ? (LG_COL_SPAN[desktop] ?? "") : "",
    spaceClass,
  ];
  return parts.filter(Boolean).join(" ");
}

/** Tailwind-Klasse für spaceBottom (z. B. am Breakout-Wrapper). */
export function getSpaceBottomClass(
  layout: BlockLayout | undefined | null,
): string {
  if (!layout || typeof layout !== "object") return "mb-4";
  const sb =
    typeof layout.spaceBottom === "number"
      ? layout.spaceBottom
      : Number(layout.spaceBottom);
  return SPACE_BOTTOM[sb as keyof typeof SPACE_BOTTOM] ?? "mb-4";
}

/** Prüft, ob das Layout breakout (fullwidth) haben soll. */
export function isBlockLayoutBreakout(
  layout: BlockLayout | undefined | null,
): boolean {
  return !!(layout && typeof layout === "object" && layout.breakout === true);
}