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 queryVariants = document.getElementById("queryVariants");
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 downloadResult = document.getElementById("downloadResult");
const cardTemplate = document.getElementById("searchCardTemplate");
const previewModal = document.getElementById("previewModal");
const previewMediaFrame = document.getElementById("previewMediaFrame");
const previewTitle = document.getElementById("previewTitle");
const previewVideo = document.getElementById("previewVideo");
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");
const startRange = document.getElementById("startRange");
const endRange = document.getElementById("endRange");
const rangeSummary = document.getElementById("rangeSummary");
const setStartFromPreview = document.getElementById("setStartFromPreview");
const setEndFromPreview = document.getElementById("setEndFromPreview");

let pendingDownload = null;

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

function toClock(totalSeconds) {
  const seconds = Math.max(0, Math.floor(Number(totalSeconds) || 0));
  const hours = String(Math.floor(seconds / 3600)).padStart(2, "0");
  const minutes = String(Math.floor((seconds % 3600) / 60)).padStart(2, "0");
  const secs = String(seconds % 60).padStart(2, "0");
  return `${hours}:${minutes}:${secs}`;
}

function syncRanges() {
  let start = Number(startRange.value || 0);
  let end = Number(endRange.value || 0);
  if (start > end) {
    if (document.activeElement === startRange) {
      end = start;
      endRange.value = String(end);
    } else {
      start = end;
      startRange.value = String(start);
    }
  }
  rangeSummary.textContent = `${toClock(start)} - ${toClock(end)}`;
}

function renderQueryVariants(queries = []) {
  queryVariants.innerHTML = "";
  if (!queries.length) {
    queryVariants.classList.add("hidden");
    return;
  }
  for (const item of queries) {
    const badge = document.createElement("span");
    badge.className = "rounded-full border border-white/10 bg-white/[0.03] px-3 py-1 text-xs uppercase tracking-[0.18em] text-zinc-300";
    badge.textContent = item;
    queryVariants.appendChild(badge);
  }
  queryVariants.classList.remove("hidden");
}

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;
    const label = data.status || `${data.type || "task"} in progress`;
    setStatus(label, Number(data.progress ?? 0));
    if (data.type === "upload" && data.status === "completed") {
      uploadResult.textContent = `${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 = "";
  if (!results.length) {
    searchResults.innerHTML = `<div class="rounded-3xl border border-white/10 bg-black/30 p-5 text-sm text-zinc-400">No results matched the current search sources.</div>`;
    return;
  }
  for (const item of results) {
    const node = cardTemplate.content.firstElementChild.cloneNode(true);
    node.href = item.link;
    node.querySelector("img").src = item.thumbnailUrl || "https://placehold.co/1280x720/0a0a0a/ffffff?text=No+Preview";
    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("preparing search", 5);
  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 || []);
    renderQueryVariants(data.queries || []);
    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");
    renderQueryVariants([]);
    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;
  previewVideo.pause();
  previewVideo.removeAttribute("src");
  previewVideo.load();
  previewMediaFrame.style.aspectRatio = "";
  if (preview.previewStreamUrl) {
    previewVideo.src = preview.previewStreamUrl;
    previewVideo.classList.remove("hidden");
    previewThumbnail.classList.add("hidden");
  } else {
    previewVideo.classList.add("hidden");
    previewThumbnail.classList.remove("hidden");
  }
  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);
  }
  const maxDuration = Number(preview.durationSeconds || 0);
  startRange.max = String(maxDuration);
  endRange.max = String(maxDuration);
  startRange.value = "0";
  endRange.value = String(maxDuration);
  syncRanges();
  previewModal.classList.remove("hidden");
  previewModal.classList.add("flex");
}

function closeModal() {
  previewVideo.pause();
  previewVideo.removeAttribute("src");
  previewVideo.load();
  previewMediaFrame.style.aspectRatio = "";
  previewModal.classList.add("hidden");
  previewModal.classList.remove("flex");
  startRange.value = "0";
  endRange.value = "0";
  syncRanges();
  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: toClock(startRange.value),
        end: toClock(endRange.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();
  }
});
startRange.addEventListener("input", syncRanges);
endRange.addEventListener("input", syncRanges);
setStartFromPreview.addEventListener("click", () => {
  startRange.value = String(Math.floor(previewVideo.currentTime || 0));
  syncRanges();
});
setEndFromPreview.addEventListener("click", () => {
  endRange.value = String(Math.floor(previewVideo.currentTime || 0));
  syncRanges();
});
previewVideo.addEventListener("loadedmetadata", () => {
  if (previewVideo.videoWidth > 0 && previewVideo.videoHeight > 0) {
    previewMediaFrame.style.aspectRatio = `${previewVideo.videoWidth} / ${previewVideo.videoHeight}`;
  }
});
previewThumbnail.addEventListener("load", () => {
  if (!previewVideo.src && previewThumbnail.naturalWidth > 0 && previewThumbnail.naturalHeight > 0) {
    previewMediaFrame.style.aspectRatio = `${previewThumbnail.naturalWidth} / ${previewThumbnail.naturalHeight}`;
  }
});

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