/* Image Picker for Admin - media library modal + upload */
(function () {
  var _currentField = null;
  var _modal = null;
  var _gallery = null;
  var _loading = null;

  function ensureModal() {
    if (_modal) return;
    var html =
      '<div id="image-picker-modal" class="ip-modal-overlay" style="display:none">' +
        '<div class="ip-modal">' +
          '<div class="ip-modal-header">' +
            '<h3>素材库</h3>' +
            '<div class="ip-modal-header-actions">' +
              '<button class="btn btn-sm btn-outline-success" onclick="imagePickerModalUpload()">' +
                '<i class="fa-solid fa-upload"></i> 上传新图片</button>' +
              '<input type="file" id="ip-modal-file" accept="image/*" style="display:none" onchange="imagePickerModalFileSelected(this)">' +
              '<button class="btn btn-sm" onclick="imagePickerClose()">' +
                '<i class="fa-solid fa-times"></i> 关闭</button>' +
            '</div>' +
          '</div>' +
          '<div class="ip-modal-body">' +
            '<div id="ip-loading" class="ip-loading">加载中...</div>' +
            '<div id="ip-gallery" class="ip-gallery"></div>' +
            '<div id="ip-empty" class="ip-empty" style="display:none">暂无图片，请先上传</div>' +
          '</div>' +
        '</div>' +
      '</div>';
    document.body.insertAdjacentHTML("beforeend", html);
    _modal = document.getElementById("image-picker-modal");
    _gallery = document.getElementById("ip-gallery");
    _loading = document.getElementById("ip-loading");

    _modal.addEventListener("click", function (e) {
      if (e.target === _modal) imagePickerClose();
    });
  }

  function loadGallery() {
    _loading.style.display = "block";
    _gallery.innerHTML = "";
    document.getElementById("ip-empty").style.display = "none";

    fetch("/admin/api/media/list", { credentials: "same-origin" })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        _loading.style.display = "none";
        var images = data.images || [];
        if (images.length === 0) {
          document.getElementById("ip-empty").style.display = "block";
          return;
        }
        images.forEach(function (img) {
          var item = document.createElement("div");
          item.className = "ip-gallery-item";
          item.innerHTML =
            '<img src="' + img.url + '" alt="' + img.name + '">' +
            '<div class="ip-gallery-name">' + img.name + '</div>';
          item.addEventListener("click", function () {
            imagePickerSelect(img.url);
          });
          _gallery.appendChild(item);
        });
      })
      .catch(function () {
        _loading.style.display = "none";
        _gallery.innerHTML = '<div class="ip-empty">加载失败，请重试</div>';
      });
  }

  window.imagePickerOpen = function (fieldId) {
    _currentField = fieldId;
    ensureModal();
    _modal.style.display = "flex";
    loadGallery();
  };

  window.imagePickerClose = function () {
    if (_modal) _modal.style.display = "none";
    _currentField = null;
  };

  window.imagePickerSelect = function (url) {
    if (!_currentField) return;
    setFieldValue(_currentField, url);
    imagePickerClose();
  };

  window.imagePickerClear = function (fieldId) {
    setFieldValue(fieldId, "");
  };

  window.imagePickerUpload = function (fieldId) {
    _currentField = fieldId;
    document.getElementById("file-" + fieldId).click();
  };

  window.imagePickerFileSelected = function (fieldId, input) {
    if (!input.files || !input.files[0]) return;
    doUpload(input.files[0], fieldId);
    input.value = "";
  };

  window.imagePickerModalUpload = function () {
    document.getElementById("ip-modal-file").click();
  };

  window.imagePickerModalFileSelected = function (input) {
    if (!input.files || !input.files[0]) return;
    doUpload(input.files[0], _currentField, function () {
      loadGallery();
    });
    input.value = "";
  };

  function doUpload(file, fieldId, callback) {
    var fd = new FormData();
    fd.append("file", file);

    var btn = document.querySelector('.ip-modal-header-actions .btn-outline-success');
    if (btn) {
      btn.disabled = true;
      btn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> 上传中...';
    }

    fetch("/admin/api/media/upload", {
      method: "POST",
      body: fd,
      credentials: "same-origin",
    })
      .then(function (r) {
        if (!r.ok) throw new Error("Upload failed");
        return r.json();
      })
      .then(function (data) {
        if (fieldId) setFieldValue(fieldId, data.url);
        if (callback) callback();
      })
      .catch(function (err) {
        alert("上传失败: " + err.message);
      })
      .finally(function () {
        if (btn) {
          btn.disabled = false;
          btn.innerHTML = '<i class="fa-solid fa-upload"></i> 上传新图片';
        }
      });
  }

  function setFieldValue(fieldId, url) {
    var input = document.getElementById(fieldId);
    if (input) input.value = url;

    var preview = document.getElementById("preview-" + fieldId);
    var previewImg = document.getElementById("preview-img-" + fieldId);
    var urlDisplay = document.getElementById("url-display-" + fieldId);

    if (url) {
      if (preview) preview.style.display = "block";
      if (previewImg) previewImg.src = url;
      if (urlDisplay) urlDisplay.textContent = url;
    } else {
      if (preview) preview.style.display = "none";
      if (previewImg) previewImg.src = "";
      if (urlDisplay) urlDisplay.textContent = "";
    }
  }
})();