export interface DirectAgentAngleEditOptions {
  horizontalAngle: number;
  verticalAngle: number;
  zoom: number;
  loraScale?: number;
}

export function clampAngleEditNumber(
  value: number | undefined,
  min: number,
  max: number,
  fallback: number,
) {
  if (!Number.isFinite(value)) return fallback;
  return Math.min(max, Math.max(min, Number(value)));
}

function parseFirstNumberMatch(text: string, patterns: RegExp[]) {
  for (const pattern of patterns) {
    const match = text.match(pattern);
    const value = Number(match?.[1]);
    if (Number.isFinite(value)) return value;
  }
  return undefined;
}

export function inferAngleEditOptionsFromText(text: string): DirectAgentAngleEditOptions {
  const normalizedText = String(text || "").toLowerCase().replace(/\s+/g, "");
  const explicitHorizontal = parseFirstNumberMatch(normalizedText, [
    /(?:水平角|水平|环绕|左右|horizontal|h)[:：]?(-?\d{1,3})(?:度|°)?/,
    /(?:旋转|转|转到|换成|改成)(-?\d{1,3})(?:度|°)/,
  ]);
  const explicitVertical = parseFirstNumberMatch(normalizedText, [
    /(?:垂直角|垂直|俯仰|上下|vertical|v)[:：]?(-?\d{1,3})(?:度|°)?/,
  ]);
  const explicitZoom = parseFirstNumberMatch(normalizedText, [
    /(?:zoom|缩放|景别)[:：]?(\d{1,2})(?:倍|x)?/,
  ]);

  let horizontalAngle = explicitHorizontal ?? 45;
  if (explicitHorizontal === undefined) {
    if (/背面|背后|背视|后视|back/.test(normalizedText)) {
      horizontalAngle = 180;
    } else if (/左侧|左边|左视|left/.test(normalizedText)) {
      horizontalAngle = 270;
    } else if (/右侧|右边|右视|侧面|侧视|profile|side/.test(normalizedText)) {
      horizontalAngle = 90;
    } else if (/正面|正视|front/.test(normalizedText)) {
      horizontalAngle = 0;
    } else if (/三分之四|四分之三|斜侧|45度|45°/.test(normalizedText)) {
      horizontalAngle = 45;
    }
  }

  let verticalAngle = explicitVertical ?? 0;
  if (explicitVertical === undefined) {
    if (/俯视|俯拍|鸟瞰|高机位|top|overhead/.test(normalizedText)) {
      verticalAngle = 45;
    } else if (/仰视|仰拍|低机位|lowangle/.test(normalizedText)) {
      verticalAngle = -20;
    } else if (/平视|eyelevel/.test(normalizedText)) {
      verticalAngle = 0;
    }
  }

  let zoom = explicitZoom ?? 5;
  if (explicitZoom === undefined) {
    if (/特写|近景|拉近|推近|zoomin/.test(normalizedText)) {
      zoom = 7;
    } else if (/远景|全身|拉远|zoomout/.test(normalizedText)) {
      zoom = 3;
    } else if (/中景/.test(normalizedText)) {
      zoom = 5;
    }
  }

  return {
    horizontalAngle: clampAngleEditNumber(horizontalAngle, 0, 360, 45),
    verticalAngle: clampAngleEditNumber(verticalAngle, -30, 90, 0),
    zoom: clampAngleEditNumber(zoom, 0, 10, 5),
  };
}