(() => {
  'use strict';

  try {
    if (window.__LTJT_ORDER_ASSISTANT_BRIDGE_HANDLER__) {
      window.removeEventListener('message', window.__LTJT_ORDER_ASSISTANT_BRIDGE_HANDLER__);
    }
  } catch (error) {
    // Old handlers can belong to an invalidated extension context after reload.
  }
  try {
    if (window.__LTJT_ORDER_ASSISTANT_STORAGE_HANDLER__) {
      chrome.storage.onChanged.removeListener(window.__LTJT_ORDER_ASSISTANT_STORAGE_HANDLER__);
    }
  } catch (error) {
    // Re-injection must keep going even when Chrome has invalidated the old context.
  }
  window.__LTJT_ORDER_ASSISTANT_BRIDGE_INSTALLED_AT__ = new Date().toISOString();

const BUSINESS_SOURCE = 'LTJT_MOCK_BUSINESS';
const EXTENSION_SOURCE = 'LTJT_ORDER_ASSISTANT_EXTENSION';

function nowIso() {
  return new Date().toISOString();
}

function postReply(requestId, type, payload = {}) {
  window.postMessage({
    source: EXTENSION_SOURCE,
    requestId,
    type,
    payload
  }, window.location.origin);
}

async function getAutomationState() {
  const saved = await chrome.storage.local.get('erpAutomationEnabled');
  const enabled = saved.erpAutomationEnabled !== false;
  return {
    erp_automation_enabled: enabled,
    erp_automation_status: enabled ? 'enabled' : 'disabled'
  };
}

async function bridgePayload(extra = {}) {
  return {
    ok: true,
    extension: 'ltjt-order-assistant',
    version: chrome.runtime.getManifest().version,
    bridge_installed_at: window.__LTJT_ORDER_ASSISTANT_BRIDGE_INSTALLED_AT__ || '',
    ...(await getAutomationState()),
    ...extra
  };
}

async function postBridgeReady() {
  window.postMessage({
    source: EXTENSION_SOURCE,
    type: 'BRIDGE_READY',
    payload: await bridgePayload()
  }, window.location.origin);
}

async function getResultMap() {
  const saved = await chrome.storage.local.get('businessTaskResults');
  return saved.businessTaskResults || {};
}

async function removeStoredBusinessTask(taskId) {
  const saved = await chrome.storage.local.get([
    'businessTasks',
    'businessTaskResults',
    'currentBusinessTask',
    'currentBusinessTaskId'
  ]);
  const belongsToTask = (candidateId) => candidateId === taskId || candidateId.startsWith(`${taskId}#`);
  const businessTasks = saved.businessTasks || {};
  const businessTaskResults = saved.businessTaskResults || {};
  Object.keys(businessTasks).filter(belongsToTask).forEach((candidateId) => delete businessTasks[candidateId]);
  Object.keys(businessTaskResults).filter(belongsToTask).forEach((candidateId) => delete businessTaskResults[candidateId]);
  await chrome.storage.local.set({ businessTasks, businessTaskResults });

  if (saved.currentBusinessTaskId === taskId || saved.currentBusinessTask?.task_id === taskId) {
    await chrome.storage.local.remove([
      'currentBusinessTask',
      'currentBusinessTaskId',
      'lastOperation',
      'lastRawText'
    ]);
  }
}

async function cancelAndRemoveTask(taskId) {
  const cancellation = await chrome.runtime.sendMessage({
    type: 'LTJT_CANCEL_TASK',
    task_id: taskId
  });
  if (cancellation?.ok === false) {
    throw new Error(cancellation.message || '插件未确认任务已取消。');
  }
  await removeStoredBusinessTask(taskId);
  return {
    ok: true,
    task_id: taskId,
    status: 'cancelled',
    cancelled: cancellation?.cancelled !== false
  };
}

async function createTask(payload) {
  const task = payload?.task || {};
  const operation = task.operation || payload?.operation;
  const taskId = task.task_id || operation?.source?.task_id || `MOCK-${Date.now()}`;
  const executionId = String(payload?.execution_id || '').trim();
  if (!operation) throw new Error('Missing task.operation');
  if (!executionId) throw new Error('Missing execution_id');
  operation.source = {
    ...(operation.source || {}),
    task_id: taskId,
    execution_id: executionId,
    origin: 'mock-business-system',
    handed_to_extension_at: nowIso()
  };
  const currentBusinessTask = {
    task_id: taskId,
    operation,
    raw_text: task.raw_text || '',
    created_at: task.created_at || nowIso(),
    received_at: nowIso(),
    execution_id: executionId,
    status: 'queued'
  };
  const acceptance = await chrome.runtime.sendMessage({
    type: 'LTJT_AUTO_EXECUTE_TASK',
    task_id: taskId,
    execution_id: executionId,
    task: currentBusinessTask
  });
  return { ...currentBusinessTask, acceptance };
}

const bridgeHandler = async (event) => {
  if (event.source !== window) return;
  const message = event.data || {};
  if (message.source !== BUSINESS_SOURCE) return;
  const requestId = message.requestId || '';
  try {
    if (message.type === 'PING') {
      postReply(requestId, 'PONG', await bridgePayload());
      return;
    }
    if (message.type === 'CREATE_TASK') {
      const task = await createTask(message.payload || {});
      postReply(requestId, 'TASK_CREATED', {
        ok: true,
        task_id: task.task_id,
        execution_id: task.execution_id,
        accepted: task.acceptance?.accepted === true,
        status: task.acceptance?.status || 'not_accepted',
        message: task.acceptance?.message || ''
      });
      return;
    }
    if (message.type === 'GET_TASK_RESULT') {
      const taskId = message.payload?.task_id || '';
      const resultMap = await getResultMap();
      postReply(requestId, 'TASK_RESULT', {
        ok: true,
        task_id: taskId,
        result: resultMap[taskId] || null
      });
      return;
    }
    if (message.type === 'GET_CURRENT_TASK') {
      const saved = await chrome.storage.local.get('currentBusinessTask');
      postReply(requestId, 'CURRENT_TASK', {
        ok: true,
        task: saved.currentBusinessTask || null
      });
      return;
    }
    if (message.type === 'DELETE_TASK') {
      const taskId = message.payload?.task_id || '';
      if (!taskId) throw new Error('Missing task_id');
      const result = await cancelAndRemoveTask(taskId);
      postReply(requestId, 'TASK_DELETED', result);
      return;
    }
    if (message.type === 'CLEAR_TASKS') {
      await chrome.storage.local.remove(['currentBusinessTask', 'currentBusinessTaskId', 'businessTasks', 'businessTaskResults']);
      postReply(requestId, 'TASKS_CLEARED', { ok: true });
      return;
    }
    postReply(requestId, 'ERROR', {
      ok: false,
      message: `Unknown bridge message type: ${message.type || '<missing>'}`
    });
  } catch (error) {
    postReply(requestId, 'ERROR', {
      ok: false,
      message: error.message || String(error)
    });
  }
};

window.__LTJT_ORDER_ASSISTANT_BRIDGE_HANDLER__ = bridgeHandler;
window.addEventListener('message', bridgeHandler);

window.__LTJT_ORDER_ASSISTANT_STORAGE_HANDLER__ = (changes, areaName) => {
  if (areaName !== 'local' || !changes.erpAutomationEnabled) return;
  postBridgeReady().catch(() => {});
};
chrome.storage.onChanged.addListener(window.__LTJT_ORDER_ASSISTANT_STORAGE_HANDLER__);

postBridgeReady().catch(() => {});
})();