const state = {
  dashboard: null,
};

async function api(path, options = {}) {
  const response = await fetch(path, {
    headers: { "Content-Type": "application/json" },
    ...options,
  });
  const data = await response.json();
  if (!response.ok) {
    throw new Error(data.error || "Request failed");
  }
  return data;
}

function formatDate(value) {
  if (!value) return "—";
  return value.replace("T", " ").replace("+00:00", " UTC");
}

function setBusy(button, busy) {
  if (!button) return;
  button.disabled = busy;
}

function renderAuth(auth) {
  document.getElementById("auth-status").textContent = auth.status;
  document.getElementById("auth-details").textContent = auth.details || "";
}

function renderSummary(data) {
  document.getElementById("channel-count").textContent = String(data.state.channel_count);
  document.getElementById("forwarding-count").textContent = String(data.state.forwarding_rules.length);
  const toggle = document.getElementById("scrape-media-toggle");
  toggle.checked = Boolean(data.state.scrape_media);
  document.getElementById("scrape-media-label").textContent = toggle.checked ? "ON" : "OFF";
}

function renderChannels(channels) {
  const tbody = document.getElementById("channels-table");
  tbody.innerHTML = "";
  const template = document.getElementById("channel-row-template");

  channels.forEach((channel) => {
    const node = template.content.firstElementChild.cloneNode(true);
    node.querySelector(".channel-name").textContent = channel.name;
    node.querySelector(".channel-id").textContent = channel.channel_id;
    node.querySelector(".message-count").textContent = String(channel.message_count);
    node.querySelector(".media-count").textContent = String(channel.media_count);
    node.querySelector(".last-date").textContent = channel.last_date || "—";

    node.querySelector(".scrape-btn").addEventListener("click", async () => {
      await api("/api/jobs/scrape", {
        method: "POST",
        body: JSON.stringify({ channel_id: channel.channel_id }),
      });
      await refreshDashboard();
    });

    node.querySelector(".export-view-btn").addEventListener("click", () => {
      window.location.href = `/viewer?channel=${encodeURIComponent(channel.channel_id)}`;
    });

    node.querySelector(".media-btn").addEventListener("click", async () => {
      await api("/api/jobs/rescrape-media", {
        method: "POST",
        body: JSON.stringify({ channel_id: channel.channel_id }),
      });
      await refreshDashboard();
    });

    node.querySelector(".remove-btn").addEventListener("click", async () => {
      await api("/api/channels/remove", {
        method: "POST",
        body: JSON.stringify({ channel_id: channel.channel_id }),
      });
      await refreshDashboard();
    });

    tbody.appendChild(node);
  });
}

function renderJobs(jobs) {
  const root = document.getElementById("jobs-list");
  root.innerHTML = "";
  const template = document.getElementById("job-template");

  if (!jobs.length) {
    root.innerHTML = '<div class="muted">Пока задач нет.</div>';
    return;
  }

  jobs.forEach((job) => {
    const node = template.content.firstElementChild.cloneNode(true);
    node.querySelector(".job-title").textContent = job.title;
    node.querySelector(".job-status").textContent = job.status;
    node.querySelector(".job-time").textContent = [job.started_at, job.finished_at].filter(Boolean).join(" -> ");
    node.querySelector(".job-logs").textContent = job.logs || job.error || "Без логов";
    root.appendChild(node);
  });
}

async function refreshDashboard() {
  const data = await api("/api/dashboard");
  state.dashboard = data;
  renderAuth(data.auth);
  renderSummary(data);
  renderChannels(data.channels);
  renderJobs(data.jobs);
}

async function main() {
  document.getElementById("scrape-all-btn").addEventListener("click", async (event) => {
    setBusy(event.currentTarget, true);
    try {
      await api("/api/jobs/scrape", { method: "POST", body: JSON.stringify({}) });
      await refreshDashboard();
    } finally {
      setBusy(event.currentTarget, false);
    }
  });

  document.getElementById("export-all-btn").addEventListener("click", async (event) => {
    setBusy(event.currentTarget, true);
    try {
      await api("/api/jobs/export", { method: "POST", body: JSON.stringify({}) });
      await refreshDashboard();
    } finally {
      setBusy(event.currentTarget, false);
    }
  });

  document.getElementById("refresh-dialogs-btn").addEventListener("click", async (event) => {
    setBusy(event.currentTarget, true);
    try {
      await api("/api/jobs/refresh-dialogs", { method: "POST", body: JSON.stringify({}) });
      await refreshDashboard();
    } finally {
      setBusy(event.currentTarget, false);
    }
  });

  document.getElementById("refresh-jobs-btn").addEventListener("click", refreshDashboard);

  document.getElementById("scrape-media-toggle").addEventListener("change", async (event) => {
    const checked = event.currentTarget.checked;
    document.getElementById("scrape-media-label").textContent = checked ? "ON" : "OFF";
    await api("/api/settings/media", {
      method: "POST",
      body: JSON.stringify({ value: checked }),
    });
    await refreshDashboard();
  });

  document.getElementById("add-channel-form").addEventListener("submit", async (event) => {
    event.preventDefault();
    const channelId = document.getElementById("add-channel-id").value.trim();
    const name = document.getElementById("add-channel-name").value.trim();
    if (!channelId) return;
    await api("/api/channels/add", {
      method: "POST",
      body: JSON.stringify({ channel_id: channelId, name }),
    });
    event.currentTarget.reset();
    await refreshDashboard();
  });

  await refreshDashboard();
  window.setInterval(refreshDashboard, 5000);
}

main().catch((error) => {
  console.error(error);
  alert(error.message);
});