/**
 * AKSRT Ticket Center Core — 工单中心共享层（REST、提示、行内校验、弹窗、图片上传）。
 *
 * 由 ticket-center.js（列表 / 详情 / 新建）消费，挂到 window.AksrtTicketCore。
 *
 * @package AKSRT
 */

(function () {
  'use strict';

  var API_ROOT = (function () {
    var d = window.aksrtData || {};
    var raw = d.apiUrl || d.restUrl || d.rest_url || '/index.php?rest_route=/aksrt/v1';
    return String(raw).replace(/\/$/, '');
  })();
  var NONCE = (window.aksrtData && window.aksrtData.restNonce) || '';
  var IMAGE_ACCEPT = 'image/gif,image/jpeg,image/png,image/webp';


  /* ------------------------------------------------------------------ *
   * 基础工具
   * ------------------------------------------------------------------ */

  function settings() {
    var d = window.aksrtData && window.aksrtData.ticket;
    return d && typeof d === 'object' ? d : {};
  }

  function attachmentEnabled() {
    return !!settings().attachmentEnabled;
  }

  function attachmentMax() {
    return parseInt(settings().attachmentMax, 10) || 5;
  }

  /** 字数上限（后台「工单中心 → 提交设置」配置，PHP 侧已夹取边界）。 */
  function lengthMax(kind) {
    var defaults = { title: 200, content: 5000, reply: 3000 };
    return parseInt(settings()[kind + 'Max'], 10) || defaults[kind];
  }

  function escapeHtml(value) {
    return String(value === null || value === undefined ? '' : value)
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#039;');
  }

  // notyf 以 HTML 拼接消息，服务端文案一律先转义。
  function notyf(text, type, timeout, id) {
    var safe = escapeHtml(text);
    if (typeof window.notyf === 'function') return window.notyf(safe, type, timeout, id);
    if (typeof window.toast === 'function') return window.toast(safe, type);
  }

  function request(path, options) {
    var opts = options || {};
    return fetch(API_ROOT + path, {
      method: opts.method || 'GET',
      headers: Object.assign({ 'X-WP-Nonce': NONCE }, opts.body ? { 'Content-Type': 'application/json' } : {}),
      body: opts.body ? JSON.stringify(opts.body) : undefined,
      credentials: 'same-origin',
    }).then(function (res) { return res.json(); });
  }

  // REST 成功返回 {success:true}，WP_Error 返回 {code,message}；非成功一律转为 reject。
  function expectSuccess(result) {
    if (result && result.success) return result;
    return Promise.reject(result || {});
  }

  // 提交前的人机验证：场景未启用时无挂载点，run 直接 resolve {}；
  // 用户中途取消验证时 run resolve null，此时 reject {cancelled:true} 中止提交。
  function runCaptcha(scene) {
    if (!window.AKSRTCaptcha || typeof window.AKSRTCaptcha.run !== 'function') {
      return Promise.resolve({});
    }
    return window.AKSRTCaptcha.run(scene).then(function (payload) {
      return payload === null ? Promise.reject({ cancelled: true }) : (payload || {});
    }, function () {
      return Promise.reject({ message: '人机验证未通过' });
    });
  }

  function failMessage(error, fallback) {
    return (error && error.message) || fallback || '网络错误，请重试';
  }

  function shortTime(value) {
    var m = /^(\d{4})-(\d{2})-(\d{2})[ T](\d{2}):(\d{2})/.exec(String(value || ''));
    if (!m) return String(value || '');
    var sameYear = m[1] === String(new Date().getFullYear());
    return (sameYear ? '' : m[1] + '-') + m[2] + '-' + m[3] + ' ' + m[4] + ':' + m[5];
  }

  function timeTag(value) {
    if (!value) return '';
    return '<time datetime="' + escapeHtml(String(value).replace(' ', 'T')) + '" title="' + escapeHtml(value) + '">'
      + escapeHtml(shortTime(value)) + '</time>';
  }

  function icon(name) {
    return '<i class="fa fas ' + name + '" aria-hidden="true"></i>';
  }

  function statusBadge(ticket) {
    return '<span class="aksrt-ticket-badge" style="--aksrt-ticket-color:' + escapeHtml(ticket.status_color || '#6b7280') + '">'
      + escapeHtml(ticket.status_label || ticket.status) + '</span>';
  }

  function emptyHtml(iconName, title, text, action) {
    return '<div class="aksrt-tickets-page__empty">'
      + '<span class="aksrt-tickets-page__empty-icon">' + icon(iconName) + '</span>'
      + '<h3>' + escapeHtml(title) + '</h3>'
      + '<p>' + escapeHtml(text) + '</p>'
      + (action || '') + '</div>';
  }

  function setBusy(button, busy, text) {
    if (!button) return;
    if (busy) {
      if (button.dataset.label === undefined) button.dataset.label = button.innerHTML;
      button.disabled = true;
      button.classList.add('is-busy');
      if (text) button.textContent = text;
      return;
    }
    button.disabled = false;
    button.classList.remove('is-busy');
    if (button.dataset.label !== undefined) {
      button.innerHTML = button.dataset.label;
      delete button.dataset.label;
    }
  }

  /* ------------------------------------------------------------------ *
   * 表单校验（行内错误，替代 toast）
   * ------------------------------------------------------------------ */

  function markInvalid(field, text) {
    if (!field) return;
    field.setAttribute('aria-invalid', 'true');
    var holder = field.closest('.aksrt-ticket-field') || field.parentNode;
    var error = holder.querySelector('.aksrt-ticket-field__error');
    if (!error) {
      error = document.createElement('p');
      error.className = 'aksrt-ticket-field__error';
      error.id = 'aksrt-ticket-err-' + Math.random().toString(36).slice(2, 8);
      error.setAttribute('role', 'alert');
      holder.appendChild(error);
    }
    error.textContent = text;
    field.setAttribute('aria-describedby', error.id);
    var focusTarget = field.matches('fieldset') ? field.querySelector('input') : field;
    if (focusTarget) focusTarget.focus();
  }

  function clearInvalid(field) {
    if (!field || field.getAttribute('aria-invalid') !== 'true') return;
    field.removeAttribute('aria-invalid');
    field.removeAttribute('aria-describedby');
    var holder = field.closest('.aksrt-ticket-field') || field.parentNode;
    var error = holder && holder.querySelector('.aksrt-ticket-field__error');
    if (error) error.remove();
  }

  function updateCounter(shell, field) {
    if (!field || !field.name || !field.maxLength || field.maxLength < 0) return;
    var counter = shell.querySelector('[data-aksrt-ticket-counter="' + field.name + '"]');
    if (!counter) return;
    var length = field.value.length;
    counter.textContent = length + ' / ' + field.maxLength;
    counter.classList.toggle('is-near', length >= field.maxLength * 0.9);
  }

  /* ------------------------------------------------------------------ *
   * 弹窗 / 图片上传（详情与新建共用）
   * ------------------------------------------------------------------ */

  function openModal(options) {
    if (!window.AksrtModalRuntime || typeof window.AksrtModalRuntime.open !== 'function') {
      notyf('工单组件加载失败，请刷新页面后重试', 'danger');
      return null;
    }
    return window.AksrtModalRuntime.open(Object.assign({ mobileBottom: true }, options));
  }


  function alive(shell) {
    return !!shell && document.contains(shell);
  }

  function setModalContent(shell, html) {
    var content = shell.querySelector('.aksrt-modal-runtime__content');
    if (content) content.innerHTML = html;
    shell.setAttribute('data-aksrt-modal-state', 'ready');
  }

  function modalError(shell, text) {
    setModalContent(shell, emptyHtml('fa-exclamation-circle', '加载失败', text,
      '<button type="button" class="btn-outline" data-aksrt-modal-close>关闭</button>'));
  }

  function imageHolder(root) {
    return root ? root.querySelector('[data-aksrt-ticket-images]') : null;
  }

  function collectAttachments(root) {
    var out = [];
    var holder = imageHolder(root);
    if (!holder) return out;
    holder.querySelectorAll('[data-aksrt-ticket-image]').forEach(function (node) {
      var url = node.getAttribute('data-aksrt-ticket-image');
      if (url && out.length < attachmentMax()) out.push(url);
    });
    return out;
  }

  function isUploading(root) {
    var holder = imageHolder(root);
    return !!(holder && holder.querySelector('.is-uploading'));
  }

  function syncUploader(root) {
    var holder = imageHolder(root);
    if (!holder) return;
    var full = holder.children.length >= attachmentMax();
    root.querySelectorAll('[data-aksrt-ticket-upload]').forEach(function (button) {
      button.disabled = full;
    });
    var count = root.querySelector('[data-aksrt-ticket-image-count]');
    if (count) {
      count.textContent = holder.children.length + ' / ' + attachmentMax();
      count.classList.toggle('is-zero', holder.children.length === 0);
    }
  }

  function uploadFiles(root, files) {
    var holder = imageHolder(root);
    if (!holder) return;
    var free = attachmentMax() - holder.children.length;
    if (free <= 0) {
      notyf('最多上传 ' + attachmentMax() + ' 张图片', 'danger');
      return;
    }
    if (files.length > free) notyf('最多还能添加 ' + free + ' 张，多余的图片已忽略', 'danger');
    files.slice(0, free).forEach(function (file) { uploadOne(root, holder, file); });
    syncUploader(root);
  }

  // × 移除即删除服务端待认领附件（仅本人、未提交的）；失败无需打扰用户，定时任务兜底清理。
  function discardUpload(id) {
    if (!id || !/^\d+$/.test(id)) return;
    fetch(API_ROOT + '/upload/pending/' + id, {
      method: 'DELETE',
      headers: { 'X-WP-Nonce': NONCE },
      credentials: 'same-origin',
    }).catch(function () {});
  }

  function uploadOne(root, holder, file) {
    var tile = document.createElement('div');
    tile.className = 'aksrt-ticket-image is-uploading';
    tile.innerHTML = '<span class="aksrt-ticket-image__spinner" aria-hidden="true"></span><span class="screen-reader-text">正在上传</span>';
    holder.appendChild(tile);

    var body = new FormData();
    body.append('image', file);
    fetch(API_ROOT + '/ticket/upload-attachment', {
      method: 'POST',
      headers: { 'X-WP-Nonce': NONCE },
      body: body,
      credentials: 'same-origin',
    }).then(function (res) { return res.json(); }).then(function (result) {
      var url = result && (result.url || (result.data && result.data.url));
      if (!url) return Promise.reject(result);
      tile.classList.remove('is-uploading');
      tile.setAttribute('data-aksrt-ticket-image', url);
      var uploadId = result.data && result.data.id;
      if (uploadId) tile.setAttribute('data-aksrt-ticket-image-id', String(uploadId));
      tile.innerHTML = '<img src="' + escapeHtml(url) + '" alt="">'
        + '<button type="button" class="aksrt-ticket-image__remove" data-aksrt-ticket-image-remove aria-label="移除图片">'
        + icon('fa-times') + '</button>';
    }).catch(function (error) {
      tile.remove();
      notyf(failMessage(error, '图片上传失败'), 'danger');
    }).then(function () { syncUploader(root); });
  }

  /**
   * 两类弹窗共用的事件：图片选择 / 移除、字数统计、输入时清除行内错误。
   * 业务点击交给 onClick；返回的 ctx 跨内容重绘保留（监听挂在 shell 上）。
   */
  function bindShell(shell, onClick) {
    var ctx = { uploadRoot: null };
    // 文件选择器保持脱离文档：shell 是 flex 居中容器，挂进去会成为第二个 flex 子项，
    // 把对话框挤偏并露出原生「选择文件」按钮（主题样式会覆盖 [hidden]）。
    var input = document.createElement('input');
    input.type = 'file';
    input.accept = IMAGE_ACCEPT;
    input.multiple = true;
    input.addEventListener('change', function () {
      var files = Array.prototype.slice.call(input.files || []);
      input.value = '';
      if (files.length && ctx.uploadRoot) uploadFiles(ctx.uploadRoot, files);
    });

    shell.addEventListener('click', function (event) {
      var remove = event.target.closest('[data-aksrt-ticket-image-remove]');
      if (remove) {
        var root = remove.closest('form');
        var tile = remove.closest('.aksrt-ticket-image');
        discardUpload(tile.getAttribute('data-aksrt-ticket-image-id'));
        tile.remove();
        syncUploader(root);
        return;
      }
      var upload = event.target.closest('[data-aksrt-ticket-upload]');
      if (upload) {
        ctx.uploadRoot = upload.closest('form');
        input.click();
        return;
      }
      if (onClick) onClick(event, ctx);
    });
    shell.addEventListener('input', function (event) {
      clearInvalid(event.target);
      updateCounter(shell, event.target);
    });
    shell.addEventListener('change', function (event) {
      clearInvalid(event.target.closest('fieldset') || event.target);
    });
    // 粘贴截图直接进入待上传区（未开启附件时表单内没有图片容器，自然跳过）。
    shell.addEventListener('paste', function (event) {
      var root = event.target.closest && event.target.closest('form');
      if (!root || !imageHolder(root) || !event.clipboardData) return;
      var files = Array.prototype.filter.call(event.clipboardData.files || [], function (file) {
        return /^image\//.test(file.type);
      });
      if (!files.length) return;
      event.preventDefault();
      uploadFiles(root, files);
    });
    return ctx;
  }

  // 回复框：工具栏里的「图片」按钮 + 输入框上方的待发送缩略图条（空时由 CSS :empty 收起）。
  function attachButtonHtml() {
    if (!attachmentEnabled()) return '';
    return '<button type="button" class="aksrt-ticket-tool" data-aksrt-ticket-upload title="添加图片，也可直接粘贴截图">'
      + icon('fa-image') + '<span>图片</span>'
      + '<span class="aksrt-ticket-tool__count is-zero" data-aksrt-ticket-image-count>0 / ' + attachmentMax() + '</span></button>';
  }

  function attachTrayHtml() {
    if (!attachmentEnabled()) return '';
    return '<div class="aksrt-ticket-tray" data-aksrt-ticket-images aria-label="待发送图片"></div>';
  }

  window.AksrtTicketCore = {
    settings: settings,
    attachmentEnabled: attachmentEnabled,
    attachmentMax: attachmentMax,
    lengthMax: lengthMax,
    escapeHtml: escapeHtml,
    notyf: notyf,
    request: request,
    expectSuccess: expectSuccess,
    runCaptcha: runCaptcha,
    failMessage: failMessage,
    timeTag: timeTag,
    icon: icon,
    statusBadge: statusBadge,
    emptyHtml: emptyHtml,
    setBusy: setBusy,
    markInvalid: markInvalid,
    openModal: openModal,
    alive: alive,
    setModalContent: setModalContent,
    modalError: modalError,
    collectAttachments: collectAttachments,
    isUploading: isUploading,
    bindShell: bindShell,
    attachButtonHtml: attachButtonHtml,
    attachTrayHtml: attachTrayHtml,
  };
})();