export const STYLE_8D_KEYS = [
  "d1Tone",
  "d2Structure",
  "d3Interaction",
  "d4Topics",
  "d5Rhythm",
  "d6Visual",
  "d7Conversion",
  "d8Risk",
] as const;

export type Style8DKey = (typeof STYLE_8D_KEYS)[number];

export const STYLE_8D_LABELS: Record<Style8DKey, string> = {
  d1Tone: "D1 語氣人格",
  d2Structure: "D2 結構模板",
  d3Interaction: "D3 互動方式",
  d4Topics: "D4 主題分布",
  d5Rhythm: "D5 發文節奏",
  d6Visual: "D6 視覺語法",
  d7Conversion: "D7 轉換方式",
  d8Risk: "D8 風險紅線",
};

export interface StoredStyle8DProfile {
  username: string;
  analyzedAt: string;
  postCount: number;
  engagement: {
    measuredPosts: number;
    medianInteractions: number;
    averageInteractions: number;
    postsAboveThreshold: number;
    threshold: number;
    verdict: "strong" | "usable" | "unknown";
  };
  analysis: Record<Style8DKey, { summary: string; evidence: string[] }>;
  personaDraft: string;
}

export function createEmptyStyle8DProfile(username = ""): StoredStyle8DProfile {
  const emptyDimension = () => ({ summary: "", evidence: [] as string[] });
  return {
    username,
    analyzedAt: "",
    postCount: 0,
    engagement: {
      measuredPosts: 0,
      medianInteractions: 0,
      averageInteractions: 0,
      postsAboveThreshold: 0,
      threshold: 10,
      verdict: "unknown",
    },
    analysis: {
      d1Tone: emptyDimension(),
      d2Structure: emptyDimension(),
      d3Interaction: emptyDimension(),
      d4Topics: emptyDimension(),
      d5Rhythm: emptyDimension(),
      d6Visual: emptyDimension(),
      d7Conversion: emptyDimension(),
      d8Risk: emptyDimension(),
    },
    personaDraft: "",
  };
}

export function parseStyle8DProfile(raw?: string | null): StoredStyle8DProfile | null {
  if (!raw?.trim()) return null;
  try {
    const value = JSON.parse(raw) as StoredStyle8DProfile;
    if (!value?.analysis) return null;
    return value;
  } catch {
    return null;
  }
}

export function buildStyle8DPromptBlock(raw?: string | null): string | null {
  const profile = parseStyle8DProfile(raw);
  if (!profile) return null;
  const dimensions = STYLE_8D_KEYS.map((key) => {
    const summary = profile.analysis[key]?.summary?.trim();
    return summary ? `${STYLE_8D_LABELS[key]}：${summary}` : null;
  }).filter(Boolean);
  if (dimensions.length === 0) return null;
  return `【8D 風格策略】\n產文與回覆都必須遵守：\n${dimensions.join("\n")}`;
}