import type { JobProgressDetail, JobTaskProgress } from "./types";

/** 海巡／分析任務的階段說明（給 UI 顯示用） */
export const SCAN_PIPELINE_STEPS = [
  { phase: "web", title: "網路搜尋", hint: "Brave Search 補充 Threads 貼文連結" },
  { phase: "tasks", title: "關鍵字搜尋", hint: "Threads API 或瀏覽器爬蟲（含真人延遲，可能較慢）" },
  { phase: "save", title: "寫入資料", hint: "把找到的貼文存進資料庫" },
  { phase: "replies", title: "抓取留言", hint: "瀏覽器讀取熱門貼文留言（Dev 模式，可略過）" },
  { phase: "quality", title: "整理結果", hint: "依互動數排序，供你自行挑選" },
] as const;

export const ANALYZE_PIPELINE_STEPS = [
  { phase: "ai", title: "AI 研究地圖", hint: "產出受眾問題、內容支柱、排除項" },
  { phase: "accounts", title: "相似帳號", hint: "網路搜尋同領域創作者（僅爆款模仿）" },
] as const;

export const STYLE_8D_PIPELINE_STEPS = [
  { phase: "session", title: "確認連線", hint: "確認 Threads Extension 同步狀態" },
  { phase: "samples", title: "抓取樣本", hint: "讀取對標帳號近期貼文與公開互動" },
  { phase: "style", title: "AI 8D", hint: "分析語氣、結構、互動、主題、節奏、視覺、轉換與風險" },
  { phase: "store", title: "儲存策略", hint: "寫入目前帳號，供產文與回覆自動使用" },
] as const;

export const AI_TASK_PIPELINE_STEPS = [
  { phase: "ai-work", title: "AI 處理", hint: "模型正在生成或分析；完成時間依模型與內容量而異" },
] as const;

export function parseJobProgressDetail(
  raw: string | null | undefined
): JobProgressDetail | null {
  if (!raw) return null;
  try {
    return JSON.parse(raw) as JobProgressDetail;
  } catch {
    return null;
  }
}

export function initTaskProgress(
  tasks: Array<{ id: string; label: string }>
): JobProgressDetail["tasks"] {
  return tasks.map((t) => ({
    id: t.id,
    label: t.label,
    status: "pending" as const,
  }));
}

export function setTaskStatus(
  detail: JobProgressDetail,
  taskId: string,
  patch: Partial<NonNullable<JobProgressDetail["tasks"]>[number]>
) {
  if (!detail.tasks) return;
  const task = detail.tasks.find((t) => t.id === taskId);
  if (!task) return;
  Object.assign(task, patch);
}

export function formatTaskMetric(task: { id: string; found?: number }): string {
  if (task.found == null) return "";
  if (task.id === "replies") return ` · ${task.found} 則留言`;
  if (task.id === "quality") return ` · ${task.found} 篇`;
  return ` · ${task.found} 篇`;
}

const PIPELINE_TASK_IDS = new Set(["web", "save", "replies", "quality", "ai", "accounts", "session", "samples", "style", "store", "ai-work"]);

export function isPipelineTask(task: JobTaskProgress): boolean {
  return PIPELINE_TASK_IDS.has(task.id);
}

/** 比「進行中」更具體的狀態說明 */
export function describeTaskStatus(
  task: JobTaskProgress,
  phase?: JobProgressDetail["phase"]
): string {
  switch (task.status) {
    case "pending":
      return "等待";
    case "done":
      return "完成";
    case "failed":
      return "失敗";
    case "cancelled":
      return "已取消";
    case "running":
      if (task.id === "web") return "Brave 網搜中…";
      if (task.id === "quality") return "整理結果中…";
      if (task.id === "replies") return "瀏覽器抓留言中…";
      if (task.id === "save") return "寫入中…";
      if (task.id === "ai") return "AI 產出研究地圖中…";
      if (task.id === "accounts") return "網路搜尋帳號中…";
      if (task.id === "session") return "確認 Threads 連線中…";
      if (task.id === "samples") return "抓取近期貼文中…";
      if (task.id === "style") return "AI 8D 分析中…";
      if (task.id === "store") return "儲存帳號策略中…";
      if (task.id === "ai-work") return "AI 處理中…";
      if (phase === "tasks") {
        if (task.step) return task.step;
        return "瀏覽器爬蟲中…";
      }
      return "進行中…";
    default:
      return "進行中…";
  }
}

export function formatTaskElapsed(startedAt?: number): string {
  if (!startedAt) return "";
  const sec = Math.max(0, Math.floor((Date.now() - startedAt) / 1000));
  if (sec < 60) return ` · ${sec}s`;
  const min = Math.floor(sec / 60);
  const rem = sec % 60;
  return ` · ${min}m${rem}s`;
}

export function getActivePhaseHint(
  phase: JobProgressDetail["phase"] | undefined,
  jobType?: "scan" | "analyze-topic" | "style-8d" | "ai-task"
): string | null {
  if (!phase) return null;
  if (jobType === "analyze-topic") {
    return ANALYZE_PIPELINE_STEPS.find((s) => s.phase === phase)?.hint ?? null;
  }
  if (jobType === "style-8d") {
    return STYLE_8D_PIPELINE_STEPS.find((s) => s.phase === phase)?.hint ?? null;
  }
  if (jobType === "ai-task") {
    return AI_TASK_PIPELINE_STEPS.find((s) => s.phase === phase)?.hint ?? null;
  }
  return SCAN_PIPELINE_STEPS.find((s) => s.phase === phase)?.hint ?? null;
}