const state = {
  images: [],
  capabilities: null,
  selectedImage: null,
  currentJob: null,
  pollTimer: null,
};

const $ = (id) => document.getElementById(id);

function assetUrl(path) {
  return `/asset?path=${encodeURIComponent(path)}&t=${Date.now()}`;
}

async function api(path, options = {}) {
  const response = await fetch(path, options);
  const payload = await response.json();
  if (!response.ok) {
    throw new Error(payload.error || response.statusText);
  }
  return payload;
}

function formatBytes(bytes) {
  if (!Number.isFinite(bytes)) return "";
  if (bytes < 1024) return `${bytes} B`;
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
  return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
}

function formatGain(value) {
  const number = Number(value);
  return Number.isFinite(number) ? number.toFixed(3) : "";
}

function svSummary(meta = {}) {
  const s = formatGain(meta.s_gain);
  const v = formatGain(meta.v_gain);
  if (!s || !v) return "";
  return `S ${s} · V ${v}`;
}

function updateGainLabels() {
  $("sGainValue").textContent = formatGain($("sGain").value);
  $("vGainValue").textContent = formatGain($("vGain").value);
}

function setOnlyPostprocessor(processor) {
  [...$("postList").querySelectorAll("input[type=checkbox]")].forEach((input) => {
    input.checked = input.value === processor;
  });
}

function setSelectIfOption(selectId, value) {
  const select = $(selectId);
  if ([...select.options].some((option) => option.value === value)) {
    select.value = value;
  }
}

function applySvFromResult(item) {
  const meta = item.meta || {};
  const sGain = Number(meta.s_gain);
  const vGain = Number(meta.v_gain);
  if (!Number.isFinite(sGain) || !Number.isFinite(vGain)) return;

  $("sGain").value = Math.min(2.5, Math.max(0, sGain));
  $("vGain").value = Math.min(2.5, Math.max(0, vGain));
  updateGainLabels();
  setOnlyPostprocessor("manual_sv");
  if (item.source) {
    setSelectIfOption("postSource", item.source);
  }
  if (item.reference) {
    setSelectIfOption("referenceImage", item.reference);
  }
  $("logBox").textContent = `已载入 ${item.name} 的参数：S=${formatGain(sGain)}，V=${formatGain(vGain)}\n可在左侧手动微调后点击“生成后处理”。`;
  setJobState("SV Ready", "done");
}

function renderImages() {
  const box = $("imageList");
  box.innerHTML = "";
  state.images.forEach((image) => {
    const item = document.createElement("button");
    item.className = `image-item ${state.selectedImage === image.name ? "active" : ""}`;
    item.type = "button";
    item.innerHTML = `
      <span>${image.name}</span>
      <span class="image-meta">${image.width || "?"}x${image.height || "?"} · ${formatBytes(image.size)}</span>
    `;
    item.addEventListener("click", () => selectImage(image.name));
    box.appendChild(item);
  });
}

function renderMethods() {
  const box = $("methodList");
  box.innerHTML = "";
  const methods = state.capabilities?.methods || {};
  Object.entries(methods).forEach(([key, info]) => {
    const checked = key === "Baidu_API" || key === "DCP";
    const label = document.createElement("label");
    label.className = `check-item ${info.available ? "" : "disabled"}`;
    label.innerHTML = `
      <span>
        <strong>${info.label}</strong>
        <span class="method-meta">${info.available ? "ready" : `缺 ${info.module_ok ? "模型" : info.module}`}</span>
      </span>
      <input type="checkbox" value="${key}" ${info.available || checked ? "" : "disabled"} ${checked ? "checked" : ""} />
    `;
    box.appendChild(label);
  });
}

function renderPostprocessors() {
  const box = $("postList");
  box.innerHTML = "";
  const processors = state.capabilities?.postprocessors || {};
  Object.entries(processors).forEach(([key, info]) => {
    const label = document.createElement("label");
    label.className = "check-item";
    label.innerHTML = `
      <span><strong>${info.label}</strong></span>
      <input type="checkbox" value="${key}" ${key === "auto_sv" ? "checked" : ""} />
    `;
    box.appendChild(label);
  });
}

function renderReferenceOptions() {
  const select = $("referenceImage");
  select.innerHTML = "";
  state.images.forEach((image) => {
    const option = document.createElement("option");
    option.value = image.name;
    option.textContent = image.name;
    option.selected = image.name === state.selectedImage;
    select.appendChild(option);
  });
}

function setJobState(text, status = "") {
  const box = $("jobState");
  box.textContent = text;
  box.className = `job-state ${status}`;
}

async function selectImage(name) {
  state.selectedImage = name;
  $("currentTitle").textContent = name;
  renderImages();
  renderReferenceOptions();
  await refreshResults();
}

function resultCard(title, path, exists = true, item = null) {
  const card = document.createElement("article");
  const summary = item ? svSummary(item.meta) : "";
  card.className = `result-card ${summary ? "clickable" : ""}`;
  const badge = exists ? '<span class="badge ok">ready</span>' : '<span class="badge pending">未生成</span>';
  const body = exists
    ? `<div class="image-frame"><img src="${assetUrl(path)}" alt="${title}" loading="lazy" /></div>${summary ? `<div class="sv-strip"><span>${summary}</span><small>点击载入</small></div>` : ""}`
    : '<div class="image-frame"><span class="missing">暂无结果</span></div>';
  card.innerHTML = `<header><h3>${title}</h3>${badge}</header>${body}`;
  if (summary && item) {
    card.tabIndex = 0;
    card.title = "点击将这组 S/V 载入左侧手动调整";
    card.addEventListener("click", () => applySvFromResult(item));
    card.addEventListener("keydown", (event) => {
      if (event.key === "Enter" || event.key === " ") {
        event.preventDefault();
        applySvFromResult(item);
      }
    });
  }
  return card;
}

function updatePostSourceOptions(results) {
  const select = $("postSource");
  const previous = select.value;
  select.innerHTML = "";
  const original = document.createElement("option");
  original.value = "original";
  original.textContent = "原图";
  select.appendChild(original);
  results.dehaze.filter((item) => item.exists).forEach((item) => {
    const option = document.createElement("option");
    option.value = item.method;
    option.textContent = item.label;
    select.appendChild(option);
  });
  if ([...select.options].some((option) => option.value === previous)) {
    select.value = previous;
  } else if (results.dehaze.some((item) => item.method === "Baidu_API" && item.exists)) {
    select.value = "Baidu_API";
  } else if (results.dehaze.some((item) => item.method === "DCP" && item.exists)) {
    select.value = "DCP";
  }
}

async function refreshResults() {
  if (!state.selectedImage) return;
  const results = await api(`/api/results?image=${encodeURIComponent(state.selectedImage)}`);
  const grid = $("resultGrid");
  grid.innerHTML = "";
  grid.appendChild(resultCard(results.original.label, results.original.path, true));
  results.dehaze.forEach((item) => {
    grid.appendChild(resultCard(item.label, item.path, item.exists));
  });
  results.postprocess.forEach((item) => {
    grid.appendChild(resultCard(item.name, item.path, true, item));
  });
  updatePostSourceOptions(results);
}

function selectedValues(containerId) {
  return [...$(containerId).querySelectorAll("input[type=checkbox]:checked")].map((input) => input.value);
}

function postParams() {
  return {
    manual_sv: {
      s_gain: Number($("sGain").value),
      v_gain: Number($("vGain").value),
    },
    hsv_hist: {
      match_hue: $("matchHue").checked,
    },
    hist_auto_sv: {
      match_hue: $("matchHue").checked,
    },
  };
}

async function startJob(endpoint, payload) {
  const response = await api(endpoint, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(payload),
  });
  state.currentJob = response.job.id;
  $("logBox").textContent = "";
  setJobState("Running", "running");
  pollJob();
}

async function pollJob() {
  if (!state.currentJob) return;
  clearTimeout(state.pollTimer);
  try {
    const job = await api(`/api/job?id=${encodeURIComponent(state.currentJob)}`);
    $("logBox").textContent = (job.logs || []).join("\n");
    $("logBox").scrollTop = $("logBox").scrollHeight;
    if (job.status === "running") {
      setJobState("Running", "running");
      state.pollTimer = setTimeout(pollJob, 1000);
    } else {
      setJobState(job.status === "done" ? "Done" : "Error", job.status);
      await refreshResults();
    }
  } catch (error) {
    setJobState("Error", "error");
    $("logBox").textContent = error.message;
  }
}

async function runSelectedModels() {
  if (!state.selectedImage) return;
  const methods = selectedValues("methodList");
  const payload = {
    image: state.selectedImage,
    methods,
    options: {
      DCP: {
        sz: Number($("dcpSz").value),
        tx: Number($("dcpTx").value),
      },
    },
  };
  await startJob("/api/run", payload);
}

async function runDefaultBatch() {
  await startJob("/api/run-default", { skip_existing: true });
}

async function runPostprocess() {
  if (!state.selectedImage) return;
  const processors = selectedValues("postList");
  const payload = {
    image: state.selectedImage,
    source: $("postSource").value,
    reference: $("referenceImage").value || state.selectedImage,
    processors,
    params: postParams(),
  };
  await startJob("/api/postprocess", payload);
}

function downloadCurrent() {
  if (!state.selectedImage) return;
  window.location.href = `/api/download?scope=current&image=${encodeURIComponent(state.selectedImage)}`;
}

function downloadAll() {
  window.location.href = "/api/download?scope=all";
}

function bindControls() {
  $("runBtn").addEventListener("click", runSelectedModels);
  $("runDefaultBatchBtn").addEventListener("click", runDefaultBatch);
  $("postBtn").addEventListener("click", runPostprocess);
  $("downloadCurrentBtn").addEventListener("click", downloadCurrent);
  $("downloadAllBtn").addEventListener("click", downloadAll);
  $("refreshBtn").addEventListener("click", refreshResults);
  $("sGain").addEventListener("input", updateGainLabels);
  $("vGain").addEventListener("input", updateGainLabels);
  updateGainLabels();
}

async function init() {
  bindControls();
  const [capabilities, images] = await Promise.all([api("/api/capabilities"), api("/api/images")]);
  state.capabilities = capabilities;
  state.images = images.images || [];
  $("envLine").textContent = capabilities.results_dir;
  renderMethods();
  renderPostprocessors();
  renderImages();
  if (state.images.length) {
    await selectImage(state.images[0].name);
  } else {
    $("currentTitle").textContent = "待去雾图片为空";
  }
  setJobState("Idle");
}

init().catch((error) => {
  setJobState("Error", "error");
  $("logBox").textContent = error.stack || error.message;
});