import { api } from "../lib/api.js";
import { on } from "../lib/bus.js";

class RunTimeline extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
    this.chatId = null;
    this.items = [];
    this.selectedDebug = null;

    this.shadowRoot.innerHTML = `
      <style>
        :host { display:block; padding:12px; }
        .box { background:#121823; border:1px solid #1e2a3a; border-radius:10px; padding:10px; margin-bottom:10px; }
        .row { display:flex; gap:8px; align-items:center; }
        .muted { color:#8aa0b5; font-size:12px; }
        .title { font-weight:800; }
        .chatlog { display:flex; flex-direction:column; gap:8px; max-height:520px; overflow:auto; padding-right:6px; margin-top:8px; }
        /* WhatsApp-ish dark theme bubbles */
        .bubble { max-width:90%; padding:8px 10px; border-radius:14px; border:1px solid #253245; font-size:13px; line-height:1.35; white-space:pre-wrap; word-break:break-word; box-shadow: 0 1px 0 rgba(0,0,0,.35); }
        .bubble.user { align-self:flex-end; background:#0f2a1a; border-color:#1f6f43; color:#e7eef7; }
        .bubble.bot { align-self:flex-start; background:#111b2a; border-color:#2a3a55; color:#e7eef7; }
        .bubble.err { align-self:flex-start; background:#241214; border-color:#e74c3c; color:#ffe9ea; cursor:pointer; }
        .bubble .meta { display:block; margin-top:6px; font-size:11px; color:#8aa0b5; }
        .bubble.user .meta { color:#b9d9c6; opacity:.85; }
        .bubble.bot .meta { color:#a9bed6; opacity:.85; }
        .bubble.err .meta { color:#ffd0d4; opacity:.85; }
        .toolbar { display:flex; gap:8px; margin-top:8px; align-items:center; }
        button { cursor:pointer; background:#0f1520; color:#e7eef7; border:1px solid #253245; border-radius:8px; padding:8px; font-size:13px; }
        pre { white-space:pre-wrap; word-break:break-word; background:#0f1520; border:1px solid #253245; border-radius:10px; padding:10px; margin:0; font-size:12px; color:#d7e2ef; }
      </style>

      <div class="box">
        <div class="muted">Conversación</div>
        <div class="title" id="chat">—</div>
        <div class="muted" id="meta">Seleccioná una conversación.</div>
        <div class="toolbar">
          <button id="refresh">Refresh</button>
          <span class="muted" id="count"></span>
        </div>
        <div class="chatlog" id="log"></div>
      </div>

      <div class="box">
        <div class="muted">Debug (click en burbuja roja para ver detalles)</div>
        <pre id="debug">—</pre>
      </div>

    `;
  }

  connectedCallback() {
    this.shadowRoot.getElementById("refresh").onclick = () => this.loadMessages();

    this._unsubSel = on("ui:selectedChat", async ({ chat_id }) => {
      this.chatId = chat_id;
      await this.loadMessages();
    });

    this._unsubRun = on("run:created", (run) => {
      if (this.chatId && run.chat_id === this.chatId) {
        // nuevo run => refrescar mensajes para ver los bubbles actualizados
        this.loadMessages();
      }
    });
  }

  disconnectedCallback() {
    this._unsubSel?.();
    this._unsubRun?.();
  }

  async loadMessages() {
    this.shadowRoot.getElementById("chat").textContent = this.chatId || "—";
    this.shadowRoot.getElementById("meta").textContent = "Cargando…";
    this.shadowRoot.getElementById("count").textContent = "";

    if (!this.chatId) {
      this.shadowRoot.getElementById("meta").textContent = "Seleccioná una conversación.";
      this.shadowRoot.getElementById("log").innerHTML = "";
      this.shadowRoot.getElementById("debug").textContent = "—";
      return;
    }

    const data = await api.messages({ chat_id: this.chatId, limit: 200 });
    this.items = data.items || [];
    this.render();
  }

  isErrorMsg(m) {
    const txt = String(m?.text || "");
    return Boolean(m?.payload?.error) || txt.startsWith("[ERROR]") || txt.toLowerCase().includes("internal_error");
  }

  render() {
    const meta = this.shadowRoot.getElementById("meta");
    const count = this.shadowRoot.getElementById("count");
    const log = this.shadowRoot.getElementById("log");
    const dbg = this.shadowRoot.getElementById("debug");

    meta.textContent = `Mostrando historial (últimos ${this.items.length}).`;
    count.textContent = this.items.length ? `${this.items.length} msgs` : "";

    log.innerHTML = "";

    for (const m of this.items) {
      const who = m.direction === "in" ? "user" : "bot";
      const isErr = this.isErrorMsg(m);
      const bubble = document.createElement("div");
      bubble.className = `bubble ${isErr ? "err" : who}`;
      bubble.textContent = m.text || (isErr ? "Error" : "—");

      const metaEl = document.createElement("span");
      metaEl.className = "meta";
      metaEl.textContent = `${new Date(m.ts).toLocaleString()} • ${m.provider} • ${m.message_id}`;
      bubble.appendChild(metaEl);

      if (isErr) {
        bubble.title = "Click para ver detalles (JSON)";
        bubble.onclick = () => {
          dbg.textContent = JSON.stringify(m, null, 2);
        };
      }

      log.appendChild(bubble);
    }

    // auto-scroll
    log.scrollTop = log.scrollHeight;

    if (!this.items.length) dbg.textContent = "—";
  }
}

customElements.define("run-timeline", RunTimeline);