// <steep-dashboard> : assemble le tableau de bord.
//
// Au montage, il charge l'état initial via REST (`/jobs`, `/reviews`), puis
// s'abonne au flux global `/events` pour tenir les listes à jour en direct.
// La sélection d'un job ouvre son flux fin via <steep-job-detail>.

import {
  endpoints,
  escapeHtml,
  fetchJobs,
  fetchReviews,
  relativeTime,
  subscribe,
} from "./api.js";
import "./theme-toggle.js";
import "./job-list.js";
import "./job-detail.js";

class Dashboard extends HTMLElement {
  connectedCallback() {
    this._jobs = { pending: [], processing: [] };
    this._reviews = [];
    this._selectedId = null;

    this.render();
    this.refresh();
    this.connect();
  }

  disconnectedCallback() {
    this._source?.close();
    if (this._refreshTimer) clearTimeout(this._refreshTimer);
  }

  // ---- Chargement et flux -------------------------------------------------

  async refresh() {
    try {
      const [jobs, reviews] = await Promise.all([fetchJobs(), fetchReviews()]);
      this._jobs = {
        pending: jobs.pending ?? [],
        processing: jobs.processing ?? [],
      };
      this._reviews = reviews.reviews ?? [];
      this.update();
    } catch (error) {
      console.error("failed to refresh the dashboard", error);
    }
  }

  connect() {
    this._source = subscribe(endpoints.lifecycle, {
      onLifecycle: (event) => this.applyLifecycle(event),
      // En cas de gap (évènements ratés), on recharge l'état depuis le REST.
      onGap: () => this.refresh(),
    });
  }

  // Recharge la liste des reviews peu après une fin de job, pour récupérer les
  // champs que l'évènement ne porte pas (markdown, coût, modèle).
  scheduleRefresh() {
    if (this._refreshTimer) clearTimeout(this._refreshTimer);
    this._refreshTimer = setTimeout(() => this.refresh(), 400);
  }

  applyLifecycle(event) {
    switch (event.type) {
      case "queued":
        if (!this._jobs.pending.some((job) => job.id === event.id)) {
          this._jobs.pending.push(this.jobFromEvent(event));
        }
        break;
      case "started": {
        // On garde le job déjà connu s'il existe, pour conserver les champs que
        // l'évènement `started` ne porte pas (event_id, created_at).
        const known = this._jobs.pending.find((job) => job.id === event.id);
        this.removeJob(event.id);
        this._jobs.processing.push(known ?? this.jobFromEvent(event));
        break;
      }
      case "review_done":
      case "failed":
        this.removeJob(event.id);
        this.scheduleRefresh();
        break;
      case "skipped":
        this.removeJob(event.id);
        break;
      default:
        return;
    }
    this.update();
  }

  removeJob(id) {
    this._jobs.pending = this._jobs.pending.filter((job) => job.id !== id);
    this._jobs.processing = this._jobs.processing.filter((job) => job.id !== id);
  }

  // L'évènement de cycle de vie porte assez de champs pour l'affichage ; le
  // rafraîchissement REST fournira le reste (created_at, payload…).
  jobFromEvent(event) {
    return {
      id: event.id,
      event_id: event.event_id,
      repo: event.repo,
      pr: event.pr,
      created_at: event.created_at,
    };
  }

  // ---- Rendu --------------------------------------------------------------

  render() {
    this.innerHTML = `
      <section class="section">
        <div class="section-heading">
          <p class="eyebrow">Live operations</p>
          <h1>Review dashboard</h1>
          <p>Pending jobs, work in progress, and completed reviews — kept in sync over SSE.</p>
        </div>

        <div class="toolbar">
          <button class="button button-secondary" id="refresh" type="button">Refresh</button>
        </div>

        <div class="board">
          <section class="panel">
            <header class="panel-head"><h2>Pending</h2><span class="count" id="pending-count">0</span></header>
            <steep-job-list id="pending" empty="No pending job."></steep-job-list>
          </section>
          <section class="panel">
            <header class="panel-head"><h2>In progress</h2><span class="count" id="processing-count">0</span></header>
            <steep-job-list id="processing" empty="No job is running."></steep-job-list>
          </section>
        </div>

        <section class="panel detail-panel">
          <header class="panel-head"><h2>Activity</h2></header>
          <steep-job-detail id="detail"></steep-job-detail>
        </section>

        <section class="panel">
          <header class="panel-head"><h2>Completed reviews</h2><span class="count" id="reviews-count">0</span></header>
          <div class="reviews" id="reviews"></div>
        </section>
      </section>`;

    this._pending = this.querySelector("#pending");
    this._processing = this.querySelector("#processing");
    this._detail = this.querySelector("#detail");
    this._reviewsEl = this.querySelector("#reviews");

    this.querySelector("#refresh").addEventListener("click", () => this.refresh());
    this.addEventListener("job-select", (event) => this.select(event.detail.id));

    this.update();
  }

  update() {
    this._pending.jobs = this._jobs.pending;
    this._pending.selected = this._selectedId;
    this._processing.jobs = this._jobs.processing;
    this._processing.selected = this._selectedId;

    this.querySelector("#pending-count").textContent = String(this._jobs.pending.length);
    this.querySelector("#processing-count").textContent = String(this._jobs.processing.length);
    this.querySelector("#reviews-count").textContent = String(this._reviews.length);

    this._reviewsEl.innerHTML = this.reviewsHtml();
  }

  select(id) {
    this._selectedId = id;
    this._detail.jobId = id;
    this.update();
    this._detail.scrollIntoView({ behavior: "smooth", block: "nearest" });
  }

  reviewsHtml() {
    if (this._reviews.length === 0) {
      return `<p class="empty">No review completed yet.</p>`;
    }

    const rows = [...this._reviews]
      .sort((a, b) => String(b.completed_at ?? "").localeCompare(String(a.completed_at ?? "")))
      .map(
        (review) => `
        <tr>
          <td><span class="pill ${review.ok ? "done" : "failed"}">${review.ok ? "done" : "failed"}</span></td>
          <td class="mono">${escapeHtml(review.repo)}#${review.pr}</td>
          <td>${review.comments}</td>
          <td>${review.duration_ms} ms</td>
          <td class="mono muted">${escapeHtml(review.model ?? "—")}</td>
          <td class="muted">${relativeTime(review.completed_at)}</td>
        </tr>`,
      )
      .join("");

    return `
      <table class="reviews-table">
        <thead>
          <tr>
            <th>Status</th><th>Pull request</th><th>Comments</th><th>Duration</th><th>Model</th><th>Completed</th>
          </tr>
        </thead>
        <tbody>${rows}</tbody>
      </table>`;
  }
}

customElements.define("steep-dashboard", Dashboard);