/* 프로젝트 관리(아사나식) 모듈 — 프론트엔드.
 * 두 페이지에서 공용:
 *   - index.html (홈): 새 프로젝트 모달
 *   - project.html: 달력/타임라인/보드/리스트 뷰 + 업무 CRUD + 서브/멤버 관리
 * 의존: FullCalendar(전역), vis(전역). 둘 다 project.html 에서만 로드.
 */
(function () {
  "use strict";

  // ── 공용 fetch ─────────────────────────────────────────────
  async function api(method, url, body) {
    const opts = { method, headers: { "Content-Type": "application/json" } };
    if (body !== undefined) opts.body = JSON.stringify(body);
    const res = await fetch(url, opts);
    if (!res.ok) {
      let msg = res.statusText;
      try { msg = (await res.json()).detail || msg; } catch (_) {}
      throw new Error(msg);
    }
    if (res.status === 204) return null;
    return res.json();
  }

  function el(id) { return document.getElementById(id); }
  function openModal(m) { if (m) m.hidden = false; }
  function closeModal(m) { if (m) m.hidden = true; }

  function wireModalClose(modal) {
    if (!modal) return;
    modal.addEventListener("click", function (e) {
      if (e.target === modal || e.target.hasAttribute("data-close")) closeModal(modal);
    });
  }

  // ── 색상 팔레트 렌더 ───────────────────────────────────────
  function renderColorPalette(container, onPick) {
    const colors = window.PJ_COLORS || ["#4573d2"];
    let selected = colors[0];
    container.innerHTML = "";
    colors.forEach(function (c) {
      const b = document.createElement("button");
      b.type = "button";
      b.className = "pj-color-swatch";
      b.style.background = c;
      if (c === selected) b.classList.add("is-active");
      b.addEventListener("click", function () {
        selected = c;
        container.querySelectorAll(".pj-color-swatch").forEach(function (x) {
          x.classList.remove("is-active");
        });
        b.classList.add("is-active");
        if (onPick) onPick(c);
      });
      container.appendChild(b);
    });
    return function () { return selected; };
  }

  // ════════════════════════════════════════════════════════════
  // 홈 페이지 — 새 프로젝트
  // ════════════════════════════════════════════════════════════
  function initHome() {
    const newBtn = el("pj-new-project");
    const modal = el("pj-modal-project");
    if (!newBtn || !modal) return;
    wireModalClose(modal);
    const getColor = renderColorPalette(el("pj-f-colors"));

    newBtn.addEventListener("click", function () { openModal(modal); });
    el("pj-save-project").addEventListener("click", async function () {
      const name = el("pj-f-name").value.trim();
      if (!name) { alert("이름을 입력하세요."); return; }
      try {
        await api("POST", "/project/api/projects", {
          name: name,
          description: el("pj-f-desc").value.trim(),
          start_date: el("pj-f-start").value || null,
          due_date: el("pj-f-due").value || null,
          color: getColor(),
        });
        location.reload();
      } catch (e) { alert("생성 실패: " + e.message); }
    });
  }

  // ════════════════════════════════════════════════════════════
  // 프로젝트 페이지
  // ════════════════════════════════════════════════════════════
  function initProject() {
    const root = document.querySelector(".pj-project-view");
    if (!root) return;
    const projectId = parseInt(root.dataset.projectId, 10);
    const canManage = root.dataset.canManage === "true";
    const isAdmin = root.dataset.isAdmin === "true";

    const dataEl = el("pj-data");
    const data = JSON.parse(dataEl.textContent);
    let stages = data.stages || [];
    let tasks = data.tasks || [];
    const members = data.members || [];
    const priorityLabels = data.priorityLabels || {};

    let calendar = null;
    let timeline = null;
    let currentView = "calendar";

    // ── 뷰 토글 ──
    const tabs = el("pj-view-tabs");
    tabs.addEventListener("click", function (e) {
      const btn = e.target.closest(".pj-tab");
      if (!btn) return;
      const view = btn.dataset.view;
      tabs.querySelectorAll(".pj-tab").forEach(function (t) {
        t.classList.toggle("is-active", t === btn);
      });
      document.querySelectorAll(".pj-view").forEach(function (v) {
        v.hidden = v.dataset.view !== view;
      });
      currentView = view;
      renderView(view);
    });

    function renderView(view) {
      if (view === "calendar") renderCalendar();
      else if (view === "timeline") renderTimeline();
      else if (view === "board") renderBoard();
      else if (view === "list") renderList();
    }

    // ── 달력 (FullCalendar) ──
    function taskEvents() {
      return tasks.filter(function (t) { return t.due_date || t.start_date; })
        .map(function (t) {
          const start = t.start_date || t.due_date;
          // FullCalendar end 는 배타적 → 마감일 포함 위해 +1일은 생략(단일일 표시)
          return {
            id: String(t.id),
            title: t.title,
            start: start,
            end: t.due_date && t.due_date !== start ? t.due_date : undefined,
            backgroundColor: t.completed_at ? "#9aa5b1" : (t.project_color || "#4573d2"),
            borderColor: "transparent",
            extendedProps: { task: t },
          };
        });
    }

    function renderCalendar() {
      const node = el("pj-calendar");
      if (calendar) { calendar.removeAllEvents(); calendar.addEventSource(taskEvents()); calendar.render(); return; }
      calendar = new FullCalendar.Calendar(node, {
        initialView: "dayGridMonth",
        locale: "ko",
        height: "auto",
        headerToolbar: { left: "prev,next today", center: "title", right: "dayGridMonth,dayGridWeek" },
        events: taskEvents(),
        eventClick: function (info) {
          info.jsEvent.preventDefault();
          if (canManage) openTaskModal(info.event.extendedProps.task);
        },
      });
      calendar.render();
    }

    // ── 타임라인 (vis-timeline) ──
    function renderTimeline() {
      const node = el("pj-timeline");
      const items = tasks.filter(function (t) { return t.start_date || t.due_date; })
        .map(function (t) {
          const s = t.start_date || t.due_date;
          const e = t.due_date || t.start_date;
          return {
            id: t.id,
            content: t.title,
            start: s,
            end: e !== s ? e : undefined,
            type: e !== s ? "range" : "point",
            style: "background-color:" + (t.completed_at ? "#9aa5b1" : (t.project_color || "#4573d2")) + ";color:#fff;border:none;",
          };
        });
      if (timeline) { timeline.destroy(); timeline = null; }
      if (!items.length) { node.innerHTML = '<div class="pj-empty">기간이 설정된 업무가 없습니다.</div>'; return; }
      timeline = new vis.Timeline(node, new vis.DataSet(items), {
        locale: "ko", stack: true, height: "520px", zoomKey: "ctrlKey",
        margin: { item: 8 },
      });
      timeline.on("select", function (props) {
        if (!canManage || !props.items.length) return;
        const t = tasks.find(function (x) { return x.id === props.items[0]; });
        if (t) openTaskModal(t);
      });
    }

    // ── 보드 (칸반) ──
    function renderBoard() {
      const board = el("pj-board");
      board.innerHTML = "";
      stages.forEach(function (stage) {
        const col = document.createElement("div");
        col.className = "pj-col";
        col.dataset.stageId = stage.id;
        col.innerHTML =
          '<div class="pj-col-head">' + escapeHtml(stage.name) +
          (stage.is_done_stage ? ' <span class="pj-chip pj-chip-sm">완료</span>' : "") +
          '<span class="pj-col-count"></span></div>' +
          '<div class="pj-col-body"></div>';
        const body = col.querySelector(".pj-col-body");
        const colTasks = tasks.filter(function (t) { return t.stage_id === stage.id; });
        col.querySelector(".pj-col-count").textContent = colTasks.length;
        colTasks.forEach(function (t) { body.appendChild(taskCard(t)); });
        if (canManage) enableDrop(body, stage.id);
        board.appendChild(col);
      });
    }

    function taskCard(t) {
      const card = document.createElement("div");
      card.className = "pj-card" + (t.completed_at ? " is-done" : "");
      card.draggable = canManage;
      card.dataset.taskId = t.id;
      card.innerHTML =
        '<div class="pj-card-title">' + escapeHtml(t.title) + "</div>" +
        '<div class="pj-card-meta">' +
        (t.priority && t.priority !== "normal"
          ? '<span class="pj-pri pj-pri-' + t.priority + '">' + (priorityLabels[t.priority] || t.priority) + "</span>"
          : "") +
        (t.assignee_email ? '<span class="pj-avatar pj-avatar-sm">' + escapeHtml((t.assignee_name || t.assignee_email)[0].toUpperCase()) + "</span>" : "") +
        (t.due_date ? '<span class="pj-card-due">' + t.due_date + "</span>" : "") +
        "</div>";
      card.addEventListener("click", function () { if (canManage) openTaskModal(t); });
      if (canManage) {
        card.addEventListener("dragstart", function (e) {
          e.dataTransfer.setData("text/plain", String(t.id));
          card.classList.add("is-dragging");
        });
        card.addEventListener("dragend", function () { card.classList.remove("is-dragging"); });
      }
      return card;
    }

    function enableDrop(body, stageId) {
      body.addEventListener("dragover", function (e) { e.preventDefault(); body.classList.add("is-over"); });
      body.addEventListener("dragleave", function () { body.classList.remove("is-over"); });
      body.addEventListener("drop", async function (e) {
        e.preventDefault();
        body.classList.remove("is-over");
        const taskId = parseInt(e.dataTransfer.getData("text/plain"), 10);
        const t = tasks.find(function (x) { return x.id === taskId; });
        if (!t || t.stage_id === stageId) return;
        try {
          const res = await api("PUT", "/project/api/tasks/" + taskId, { stage_id: stageId });
          mergeTask(res.task);
          renderBoard();
        } catch (err) { alert("이동 실패: " + err.message); }
      });
    }

    // ── 리스트 ──
    function renderList() {
      const tbody = el("pj-list").querySelector("tbody");
      tbody.innerHTML = "";
      tasks.forEach(function (t) {
        const tr = document.createElement("tr");
        if (t.completed_at) tr.className = "is-done";
        tr.innerHTML =
          "<td>" + escapeHtml(t.title) + "</td>" +
          "<td>" + escapeHtml(t.assignee_name || t.assignee_email || "-") + "</td>" +
          "<td>" + escapeHtml(t.stage_name || "-") + "</td>" +
          "<td>" + (priorityLabels[t.priority] || t.priority || "-") + "</td>" +
          "<td>" + (t.start_date || "-") + "</td>" +
          "<td>" + (t.due_date || "-") + "</td>";
        if (canManage) { tr.style.cursor = "pointer"; tr.addEventListener("click", function () { openTaskModal(t); }); }
        tbody.appendChild(tr);
      });
    }

    function mergeTask(task) {
      const i = tasks.findIndex(function (x) { return x.id === task.id; });
      if (i >= 0) tasks[i] = Object.assign({}, tasks[i], task);
      else tasks.push(task);
    }

    function refreshActiveView() {
      if (currentView === "calendar" && calendar) { calendar.removeAllEvents(); calendar.addEventSource(taskEvents()); }
      else renderView(currentView);
    }

    // ── 업무 모달 ──
    const taskModal = el("pj-modal-task");
    wireModalClose(taskModal);

    function openTaskModal(task) {
      el("pj-task-modal-title").textContent = task ? "업무 편집" : "새 업무";
      el("pj-t-id").value = task ? task.id : "";
      el("pj-t-title").value = task ? task.title : "";
      el("pj-t-desc").value = task ? (task.description || "") : "";
      el("pj-t-assignee").value = task ? (task.assignee_email || "") : "";
      el("pj-t-stage").value = task && task.stage_id ? task.stage_id : (stages[0] ? stages[0].id : "");
      el("pj-t-priority").value = task ? (task.priority || "normal") : "normal";
      el("pj-t-start").value = task ? (task.start_date || "") : "";
      el("pj-t-due").value = task ? (task.due_date || "") : "";
      el("pj-delete-task").hidden = !task;
      openModal(taskModal);
    }

    const newTaskBtn = el("pj-new-task");
    if (newTaskBtn) newTaskBtn.addEventListener("click", function () { openTaskModal(null); });

    el("pj-save-task").addEventListener("click", async function () {
      const id = el("pj-t-id").value;
      const assigneeSel = el("pj-t-assignee");
      const assigneeName = assigneeSel.selectedOptions[0] ? (assigneeSel.selectedOptions[0].dataset.name || "") : "";
      const payload = {
        title: el("pj-t-title").value.trim(),
        description: el("pj-t-desc").value.trim(),
        assignee_email: assigneeSel.value,
        assignee_name: assigneeName,
        stage_id: parseInt(el("pj-t-stage").value, 10) || null,
        priority: el("pj-t-priority").value,
        start_date: el("pj-t-start").value || null,
        due_date: el("pj-t-due").value || null,
      };
      if (!payload.title) { alert("제목을 입력하세요."); return; }
      try {
        let res;
        if (id) res = await api("PUT", "/project/api/tasks/" + id, payload);
        else res = await api("POST", "/project/api/projects/" + projectId + "/tasks", payload);
        mergeTask(res.task);
        closeModal(taskModal);
        refreshActiveView();
      } catch (e) { alert("저장 실패: " + e.message); }
    });

    el("pj-delete-task").addEventListener("click", async function () {
      const id = el("pj-t-id").value;
      if (!id || !confirm("이 업무를 삭제할까요?")) return;
      try {
        await api("DELETE", "/project/api/tasks/" + id);
        tasks = tasks.filter(function (x) { return String(x.id) !== String(id); });
        closeModal(taskModal);
        refreshActiveView();
      } catch (e) { alert("삭제 실패: " + e.message); }
    });

    // ── 서브프로젝트 추가/삭제 ──
    const newSubBtn = el("pj-new-sub");
    if (newSubBtn) newSubBtn.addEventListener("click", async function () {
      const name = prompt("서브프로젝트 이름");
      if (!name || !name.trim()) return;
      try {
        await api("POST", "/project/api/projects/" + projectId + "/subprojects", { name: name.trim() });
        location.reload();
      } catch (e) { alert("생성 실패: " + e.message); }
    });
    document.querySelectorAll(".pj-del-sub").forEach(function (b) {
      b.addEventListener("click", async function () {
        if (!confirm("이 서브프로젝트를 삭제할까요? (하위 업무도 모두 삭제)")) return;
        try { await api("DELETE", "/project/api/projects/" + b.dataset.id); location.reload(); }
        catch (e) { alert("삭제 실패: " + e.message); }
      });
    });

    // ── 멤버 배정/제외 (관리자) ──
    const addMemberBtn = el("pj-add-member");
    if (addMemberBtn) addMemberBtn.addEventListener("click", async function () {
      const email = prompt("배정할 직원 이메일 (@dbxcorp.co.kr)");
      if (!email || !email.trim()) return;
      try {
        await api("POST", "/project/api/projects/" + projectId + "/members", {
          user_email: email.trim(), role: "member",
        });
        location.reload();
      } catch (e) { alert("배정 실패: " + e.message); }
    });
    document.querySelectorAll(".pj-del-member").forEach(function (b) {
      b.addEventListener("click", async function () {
        if (!confirm("이 멤버를 프로젝트에서 제외할까요?")) return;
        try {
          await api("DELETE", "/project/api/projects/" + projectId + "/members/" + encodeURIComponent(b.dataset.email));
          location.reload();
        } catch (e) { alert("제외 실패: " + e.message); }
      });
    });

    // 최초 렌더
    renderCalendar();
  }

  function escapeHtml(s) {
    return String(s == null ? "" : s)
      .replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;").replace(/'/g, "&#39;");
  }

  document.addEventListener("DOMContentLoaded", function () {
    initHome();
    initProject();
  });
})();