import {
  MAX_SEARCH_RESULTS,
  apiPath,
  fetchJson,
  matchesFilters,
  renderWorkList,
  selectedAges,
  splitFilters,
  updateDatasetStatus,
} from "./shared.js";

const state = {
  naturalResults: null,
  requestId: 0,
};

const elements = {
  datasetStatus: document.querySelector("#datasetStatus"),
  searchInput: document.querySelector("#searchInput"),
  naturalSearchButton: document.querySelector("#naturalSearchButton"),
  clearNaturalSearchButton: document.querySelector("#clearNaturalSearchButton"),
  searchMode: document.querySelector("#searchMode"),
  tagInput: document.querySelector("#tagInput"),
  ageFilters: document.querySelectorAll(".ageFilter"),
  workList: document.querySelector("#workList"),
  searchCount: document.querySelector("#searchCount"),
};

function currentFilters() {
  return {
    ages: selectedAges(elements.ageFilters),
    tags: splitFilters(elements.tagInput.value),
    query: elements.searchInput.value,
  };
}

async function normalResults(requestId) {
  const filters = currentFilters();
  const payload = await fetchJson(apiPath("/api/works", {
    q: filters.query,
    limit: MAX_SEARCH_RESULTS,
    age: [...filters.ages],
    tag: filters.tags,
  }));
  if (requestId !== state.requestId) return null;
  return payload.results || [];
}

function naturalResults() {
  if (!state.naturalResults) return null;
  const filters = currentFilters();
  return state.naturalResults
    .map((result) => ({ work: result.work, score: result.score }))
    .filter((entry) => entry.work && matchesFilters(entry.work, { ...filters, query: "" }));
}

async function renderSearch() {
  const semanticEntries = naturalResults();
  if (semanticEntries) {
    renderWorkList(elements.workList, semanticEntries, { emptyText: "自然文検索に該当する作品がありません。" });
    elements.searchCount.textContent = `${semanticEntries.length}件`;
    return;
  }

  const requestId = state.requestId + 1;
  state.requestId = requestId;
  elements.searchCount.textContent = "読み込み中";
  renderWorkList(elements.workList, [], { emptyText: "最近追加されたASMRを読み込み中..." });

  try {
    const results = await normalResults(requestId);
    if (!results) return;
    renderWorkList(elements.workList, results, { emptyText: "該当する作品がありません。" });
    elements.searchCount.textContent = `${results.length}件`;
    elements.searchMode.textContent = elements.searchInput.value.trim()
      ? "作品名・タグ・声優名で絞り込み中です。"
      : "最近追加されたASMRを表示しています。";
  } catch (error) {
    if (requestId !== state.requestId) return;
    elements.searchCount.textContent = "エラー";
    renderWorkList(elements.workList, [], { emptyText: `作品一覧を読み込めません: ${error.message}` });
  }
}

function clearNaturalSearch() {
  state.naturalResults = null;
  elements.clearNaturalSearchButton.hidden = true;
  elements.searchMode.textContent = "入力すると作品名・タグ・声優名で絞り込みます。";
  renderSearch();
}

async function requestNaturalSearch() {
  const query = elements.searchInput.value.trim();
  if (!query) {
    elements.searchMode.textContent = "聴きたい雰囲気を入力してください。";
    return;
  }

  elements.naturalSearchButton.disabled = true;
  elements.searchMode.textContent = "自然文検索中...";
  try {
    const payload = await fetchJson("/api/search", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        query,
        limit: MAX_SEARCH_RESULTS,
        ages: [...selectedAges(elements.ageFilters)],
        requiredTags: splitFilters(elements.tagInput.value),
      }),
    });

    state.naturalResults = payload.results || [];
    elements.clearNaturalSearchButton.hidden = false;
    elements.searchMode.textContent = `自然文検索: ${query}`;
    renderSearch();
  } catch (error) {
    state.naturalResults = null;
    elements.clearNaturalSearchButton.hidden = true;
    elements.searchMode.textContent = `自然文検索を使えません: ${error.message}`;
    renderSearch();
  } finally {
    elements.naturalSearchButton.disabled = false;
  }
}

function bindEvents() {
  elements.searchInput.addEventListener("input", () => {
    if (state.naturalResults) clearNaturalSearch();
    else renderSearch();
  });
  elements.searchInput.addEventListener("keydown", (event) => {
    if (event.key !== "Enter") return;
    event.preventDefault();
    requestNaturalSearch();
  });
  elements.naturalSearchButton.addEventListener("click", requestNaturalSearch);
  elements.clearNaturalSearchButton.addEventListener("click", clearNaturalSearch);
  elements.tagInput.addEventListener("input", renderSearch);
  for (const input of elements.ageFilters) input.addEventListener("change", renderSearch);
}

async function init() {
  const status = await fetchJson("/api/status");
  updateDatasetStatus(elements.datasetStatus, status);
  bindEvents();
  renderSearch();
}

init().catch((error) => {
  elements.datasetStatus.textContent = `読み込み失敗: ${error.message}`;
});