import { ItemView, WorkspaceLeaf } from "obsidian";
import { fetchMemories, fetchDistillStatus, fetchDistillQuota, type MemoryRecord } from "./api";

export const MEMORY_VIEW_TYPE = "zhiyi-memory-view";

export class MemoryView extends ItemView {
  private container: HTMLElement;
  private memories: MemoryRecord[] = [];
  private currentPage = 0;
  private pageSize = 20;
  private totalMemories = 0;
  private status_interval: number | null = null;

  constructor(leaf: WorkspaceLeaf) {
    super(leaf);
    this.container = this.contentEl;
  }

  getViewType() { return MEMORY_VIEW_TYPE; }
  getDisplayText() { return "织忆记忆"; }

  async onOpen() {
    this.render();
    this.startStatusPoll();
  }

  async onClose() {
    if (this.status_interval !== null) {
      (window as unknown as { clearInterval: (n: number) => void }).clearInterval(this.status_interval);
    }
  }

  private startStatusPoll() {
    // 轮询蒸馏状态（每 30 秒）
    const id = (window as unknown as { setInterval: (fn: () => void, ms: number) => number }).setInterval(
      () => this.renderDistillBanner(),
      30000
    );
    this.status_interval = id;
  }

  private async renderDistillBanner() {
    const banner = this.container.querySelector(".zhiyi-distill-banner") as HTMLElement;
    if (!banner) return;
    try {
      const [status, quota] = await Promise.all([fetchDistillStatus(), fetchDistillQuota()]);
      if (status.queue_len > 0) {
        banner.innerHTML = `<span class="zhiyi-warn">⚠️ 蒸馏队列: ${status.queue_len} 条</span>`;
        banner.style.display = "block";
      } else {
        banner.style.display = "none";
      }
    } catch (_) {
      // ignore
    }
  }

  async render() {
    this.container.empty();
    this.container.createEl("style", {
      text: `
        .zhiyi-memory-view { height: 100%; display: flex; flex-direction: column; font-size: 13px; }
        .zhiyi-header { padding: 10px 12px 6px; border-bottom: 1px solid var(--background-modifier-border); }
        .zhiyi-header h1 { font-size: 14px; font-weight: 600; margin: 0 0 4px; }
        .zhiyi-stats { color: var(--text-muted); font-size: 11px; margin: 0; }
        .zhiyi-distill-banner {
          display: none; background: #c44; color: white; padding: 4px 12px;
          font-size: 12px; font-weight: 600; cursor: pointer;
        }
        .zhiyi-body { flex: 1; overflow-y: auto; }
        .zhiyi-item {
          padding: 8px 12px; border-bottom: 1px solid var(--background-modifier-border);
          cursor: pointer;
        }
        .zhiyi-item:hover { background: var(--background-modifier-hover); }
        .zhiyi-item-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2px; }
        .zhiyi-item-cat { font-size: 10px; color: var(--text-muted); background: var(--background-secondary); padding: 1px 4px; border-radius: 2px; }
        .zhiyi-item-score { font-size: 10px; color: var(--text-muted); }
        .zhiyi-item-content { font-size: 12px; color: var(--text-normal); line-height: 1.4; }
        .zhiyi-item-time { font-size: 10px; color: var(--text-muted); margin-top: 2px; }
        .zhiyi-item-id { font-size: 10px; color: var(--text-faint); font-family: monospace; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; }
        .zhiyi-pagination { display: flex; gap: 6px; padding: 8px 12px; border-top: 1px solid var(--background-modifier-border); }
        .zhiyi-pagination button { flex: 1; padding: 4px; background: var(--background-secondary); border: 1px solid var(--background-modifier-border); border-radius: 4px; cursor: pointer; font-size: 11px; }
        .zhiyi-pagination button:disabled { opacity: 0.4; cursor: not-allowed; }
        .zhiyi-loading { padding: 20px; text-align: center; color: var(--text-muted); }
        .zhiyi-empty { padding: 20px; text-align: center; color: var(--text-muted); }
      `
    });
    this.container.createEl("div", { cls: "zhiyi-memory-view" }).append(
      this.container.createEl("div", { cls: "zhiyi-distill-banner" }),
      this.container.createEl("div", { cls: "zhiyi-header" }).append(
        this.container.createEl("h1", { text: "🧠 织忆记忆" }),
        this.container.createEl("p", { cls: "zhiyi-stats", text: "加载中..." })
      ),
      this.container.createEl("div", { cls: "zhiyi-body" }),
      this.container.createEl("div", { cls: "zhiyi-pagination" })
    );
    await this.loadMemories();
    await this.renderDistillBanner();
  }

  async loadMemories() {
    const body = this.container.querySelector(".zhiyi-body") as HTMLElement;
    const stats = this.container.querySelector(".zhiyi-stats") as HTMLElement;
    body.innerHTML = '<div class="zhiyi-loading">加载中…</div>';
    try {
      const data = await fetchMemories({ namespace: "hermes-main", limit: this.pageSize, offset: this.currentPage * this.pageSize });
      this.memories = data.memories || [];
      this.totalMemories = data.total || 0;
      stats.setText(`${this.totalMemories} 条记忆 · 第 ${this.currentPage + 1} 页`);
      this.renderList();
    } catch (e) {
      body.innerHTML = `<div class="zhiyi-empty">加载失败: ${(e as Error).message}</div>`;
    }
  }

  private renderList() {
    const body = this.container.querySelector(".zhiyi-body") as HTMLElement;
    const pag = this.container.querySelector(".zhiyi-pagination") as HTMLElement;
    body.empty();
    if (this.memories.length === 0) {
      body.createEl("div", { cls: "zhiyi-empty", text: "暂无记忆" });
    }
    for (const mem of this.memories) {
      const item = body.createEl("div", { cls: "zhiyi-item" });
      const header = item.createEl("div", { cls: "zhiyi-item-header" });
      header.createEl("span", { cls: "zhiyi-item-cat", text: mem.category || "normal" });
      header.createEl("span", { cls: "zhiyi-item-score", text: `score: ${(mem.quality_score ?? 0).toFixed(2)}` });
      item.createEl("div", { cls: "zhiyi-item-content", text: this.truncate(mem.content, 120) });
      item.createEl("div", { cls: "zhiyi-item-time", text: this.formatTime(mem.created_at) });
      item.createEl("div", { cls: "zhiyi-item-id", text: mem.id });
    }
    const totalPages = Math.ceil(this.totalMemories / this.pageSize);
    pag.empty();
    if (totalPages > 1) {
      const prev = pag.createEl("button", { text: "◀ 上一页" });
      prev.setAttr("disabled", this.currentPage === 0 ? "true" : "");
      prev.onclick = () => { this.currentPage--; this.loadMemories(); };
      pag.createEl("span", { text: `${this.currentPage + 1}/${totalPages}`, cls: "zhiyi-item-cat" });
      const next = pag.createEl("button", { text: "下一页 ▶" });
      next.setAttr("disabled", this.currentPage >= totalPages - 1 ? "true" : "");
      next.onclick = () => { this.currentPage++; this.loadMemories(); };
    }
  }

  private truncate(s: string, max: number) {
    if (!s) return "";
    return s.length > max ? s.slice(0, max) + "…" : s;
  }

  private formatTime(iso: string) {
    if (!iso) return "";
    try {
      const d = new Date(iso);
      return d.toLocaleString("zh-CN", { month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit" });
    } catch { return iso; }
  }
}