// Panneau d'activité d'un job : ouvre un flux SSE vers `/jobs/{id}/events`,
// rejoue l'historique renvoyé par le serveur puis affiche le direct.

import { endpoints, escapeHtml, subscribe } from "./api.js";

class JobDetail extends HTMLElement {
  set jobId(value) {
    const id = value ?? null;
    if (this._jobId === id) return;
    this._jobId = id;
    this.open();
  }

  connectedCallback() {
    if (!this._jobId) this.renderPlaceholder();
  }

  disconnectedCallback() {
    this.close();
  }

  close() {
    if (this._source) {
      this._source.close();
      this._source = null;
    }
  }

  open() {
    this.close();
    this._finished = false;

    if (!this._jobId) {
      this.renderPlaceholder();
      return;
    }

    this.innerHTML = `
      <div class="log" id="log" role="log" aria-live="polite"></div>`;
    this._log = this.querySelector("#log");

    this._source = subscribe(endpoints.jobEvents(this._jobId), {
      onProgress: (event) => {
        this.append(event);
        if (event.type === "finished") {
          this._finished = true;
          this.close();
        }
      },
      onGap: (skipped) =>
        this.append({ type: "gap", note: `missed ${skipped} events, refresh to resync` }),
      // Un `error` survient aussi quand le serveur ferme le flux (job terminé).
      // On ferme alors la source pour éviter la boucle de reconnexion (le job
      // n'est plus en cours, la route renverrait 404).
      onError: () => {
        if (this._finished) return;
        this.append({ type: "gap", note: "stream closed" });
        this.close();
      },
    });
  }

  renderPlaceholder() {
    this.innerHTML = `<p class="empty">Select a job in progress to watch the agent work.</p>`;
  }

  append(event) {
    if (!this._log) return;
    this._log.append(this.entry(event));
    this._log.scrollTop = this._log.scrollHeight;
  }

  entry(event) {
    return event.type === "tool_result" ? this.resultEntry(event) : this.lineEntry(event);
  }

  // Ligne simple : appel d'outil, fin de review, gap.
  lineEntry(event) {
    const row = document.createElement("div");
    row.className = "log-entry";
    row.dataset.kind = event.type;

    const { tag, body } = this.describe(event);

    const tagEl = document.createElement("span");
    tagEl.className = "log-tag";
    tagEl.textContent = tag;

    const bodyEl = document.createElement("span");
    bodyEl.className = "log-body";
    bodyEl.innerHTML = body;

    row.append(tagEl, bodyEl);
    return row;
  }

  // Résultat d'outil : replié par défaut, avec un aperçu sur une ligne.
  resultEntry(event) {
    const details = document.createElement("details");
    details.className = "log-result";

    const summary = document.createElement("summary");
    const chev = document.createElement("span");
    chev.className = "chev";
    chev.setAttribute("aria-hidden", "true");
    const tag = document.createElement("span");
    tag.className = "log-tag";
    tag.textContent = "result";
    const preview = document.createElement("span");
    preview.className = "log-preview";
    preview.textContent = this.preview(event.output);
    summary.append(chev, tag, preview);

    const body = document.createElement("div");
    body.className = "log-body";
    const truncated = event.truncated
      ? ' <span class="log-truncated">(truncated)</span>'
      : "";
    body.innerHTML = `${escapeHtml(event.output)}${truncated}`;

    details.append(summary, body);
    return details;
  }

  preview(text) {
    const line = String(text ?? "").replace(/\s+/g, " ").trim();
    return line.length > 80 ? `${line.slice(0, 80)}…` : line;
  }

  describe(event) {
    switch (event.type) {
      case "tool_call":
        return {
          tag: "call",
          body: `${escapeHtml(event.name)} <span class="log-args">${escapeHtml(event.arguments)}</span>`,
        };
      case "finished":
        return {
          tag: "done",
          body: event.ok ? "review finished" : "review failed",
        };
      case "gap":
        return { tag: "gap", body: escapeHtml(event.note ?? "gap") };
      default:
        return { tag: escapeHtml(event.type ?? "event"), body: "" };
    }
  }
}

customElements.define("steep-job-detail", JobDetail);