const statusBar = document.getElementById("statusBar");
const statusLabel = document.getElementById("statusLabel");
const searchForm = document.getElementById("searchForm");
const searchQuery = document.getElementById("searchQuery");
const searchResults = document.getElementById("searchResults");
const searchWarning = document.getElementById("searchWarning");
const dropzone = document.getElementById("dropzone");
const fileInput = document.getElementById("fileInput");
const uploadResult = document.getElementById("uploadResult");
const downloadForm = document.getElementById("downloadForm");
const downloadUrl = document.getElementById("downloadUrl");
const startTime = document.getElementById("startTime");
const endTime = document.getElementById("endTime");
const downloadResult = document.getElementById("downloadResult");
const cardTemplate = document.getElementById("searchCardTemplate");
const previewModal = document.getElementById("previewModal");
const previewTitle = document.getElementById("previewTitle");
const previewThumbnail = document.getElementById("previewThumbnail");
const previewDuration = document.getElementById("previewDuration");
const qualitySelect = document.getElementById("qualitySelect");
const confirmDownload = document.getElementById("confirmDownload");
const closePreviewModal = document.getElementById("closePreviewModal");

let pendingDownload = null;

function setStatus(label, progress) {
  statusLabel.textContent = label;
  statusBar.style.width = `${Math.max(0, Math.min(100, progress))}%`;
}

function connectWS() {
  const protocol = window.location.protocol === "https:" ? "wss" : "ws";
  const socket = new WebSocket(`${protocol}://${window.location.host}/ws`);
  socket.addEventListener("message", (event) => {
    const payload = JSON.parse(event.data);
    if (payload.event !== "progress") {
      return;
    }
    const data = payload.data;
    setStatus(`${data.type || "task"}: ${data.status}`, Number(data.progress ?? 0));
    if (data.type === "upload" && data.status === "completed") {
      uploadResult.textContent = `${data.filename} saved successfully`;
    }
    if (data.type === "download" && data.status === "completed") {
      downloadResult.textContent = data.output || "download completed";
    }
    if (data.status === "error") {
      downloadResult.textContent = data.message || "task failed";
    }
  });
  socket.addEventListener("close", () => {
    setTimeout(connectWS, 1000);
  });
}

async function api(path, options = {}) {
  const response = await fetch(path, options);
  const data = await response.json().catch(() => ({}));
  if (!response.ok) {
    const error = new Error(data.error || "request failed");
    error.status = response.status;
    error.data = data;
    throw error;
  }
  return data;
}

function renderResults(results) {
  searchResults.innerHTML = "";
  for (const item of results) {
    const node = cardTemplate.content.firstElementChild.cloneNode(true);
    node.href = item.link;
    node.querySelector("img").src = item.thumbnailUrl;
    node.querySelector("img").alt = item.title;
    node.querySelector("h3").textContent = item.title;
    node.querySelector("p").textContent = item.reason;
    node.querySelector(".source-badge").textContent = item.source;
    searchResults.appendChild(node);
  }
}

searchForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  setStatus("searching", 20);
  searchWarning.classList.add("hidden");
  try {
    const data = await api("/api/search", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ query: searchQuery.value }),
    });
    renderResults(data.results || []);
    if (data.warning) {
      searchWarning.textContent = data.warning;
      searchWarning.classList.remove("hidden");
    }
    setStatus("search complete", 100);
  } catch (error) {
    searchWarning.textContent = error.message;
    searchWarning.classList.remove("hidden");
    setStatus("search failed", 100);
  }
});

async function uploadFile(file) {
  const formData = new FormData();
  formData.append("file", file);
  uploadResult.textContent = "uploading...";
  try {
    await api("/api/upload", { method: "POST", body: formData });
  } catch (error) {
    uploadResult.textContent = error.message;
  }
}

function openPreviewModal(preview) {
  previewTitle.textContent = preview.title;
  previewThumbnail.src = preview.thumbnail;
  previewThumbnail.alt = preview.title;
  previewDuration.textContent = preview.duration;
  qualitySelect.innerHTML = "";
  for (const item of preview.qualities || []) {
    const option = document.createElement("option");
    option.value = item.value;
    option.textContent = item.label;
    qualitySelect.appendChild(option);
  }
  startTime.value = preview.startDefault || "00:00:00";
  endTime.value = preview.endDefault || "00:00:00";
  previewModal.classList.remove("hidden");
  previewModal.classList.add("flex");
}

function closeModal() {
  previewModal.classList.add("hidden");
  previewModal.classList.remove("flex");
  pendingDownload = null;
}

dropzone.addEventListener("dragover", (event) => {
  event.preventDefault();
  dropzone.classList.add("border-white/60", "bg-white/[0.08]");
});

dropzone.addEventListener("dragleave", () => {
  dropzone.classList.remove("border-white/60", "bg-white/[0.08]");
});

dropzone.addEventListener("drop", async (event) => {
  event.preventDefault();
  dropzone.classList.remove("border-white/60", "bg-white/[0.08]");
  const file = event.dataTransfer.files[0];
  if (file) {
    await uploadFile(file);
  }
});

fileInput.addEventListener("change", async () => {
  const [file] = fileInput.files;
  if (file) {
    await uploadFile(file);
  }
});

downloadForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  downloadResult.textContent = "checking duplicate history...";
  try {
    const dup = await api(`/api/history/check?url=${encodeURIComponent(downloadUrl.value)}`);
    let force = false;
    if (dup.exists) {
      force = window.confirm("동일 URL 다운로드 이력이 있습니다. 계속 진행할까요?");
      if (!force) {
        downloadResult.textContent = "cancelled";
        return;
      }
    }
    pendingDownload = { url: downloadUrl.value, force };
    downloadResult.textContent = "loading preview...";
    const preview = await api("/api/download/preview", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ url: downloadUrl.value }),
    });
    openPreviewModal(preview);
    downloadResult.textContent = "preview loaded";
  } catch (error) {
    downloadResult.textContent = error.message;
  }
});

confirmDownload.addEventListener("click", async () => {
  if (!pendingDownload) {
    return;
  }
  try {
    const data = await api("/api/download", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        url: pendingDownload.url,
        start: startTime.value,
        end: endTime.value,
        quality: qualitySelect.value,
        force: pendingDownload.force,
      }),
    });
    closeModal();
    downloadResult.textContent = data.message;
  } catch (error) {
    downloadResult.textContent = error.message;
  }
});

closePreviewModal.addEventListener("click", closeModal);
previewModal.addEventListener("click", (event) => {
  if (event.target === previewModal) {
    closeModal();
  }
});

connectWS();
setStatus("idle", 0);