/**
 * Create folder functionality
 */
const { callGraphAPI } = require('../utils/graph-api');
const { ensureAuthenticated } = require('../auth');
const { getFolderIdByName } = require('../email/folder-utils');
const { normalizeMailbox, buildPath, withMailboxHeaders } = require('../utils/mailbox');

/**
 * Create folder handler
 * @param {object} args - Tool arguments
 * @returns {object} - MCP response
 */
async function handleCreateFolder(args) {
  const folderName = args.name;
  const parentFolder = args.parentFolder || '';
  const mb = normalizeMailbox(args.mailbox);

  if (!folderName) {
    return {
      content: [{
        type: "text",
        text: "Folder name is required."
      }]
    };
  }

  try {
    const accessToken = await ensureAuthenticated();
    const result = await createMailFolder(accessToken, folderName, parentFolder, mb);

    return {
      content: [{
        type: "text",
        text: result.message
      }]
    };
  } catch (error) {
    if (error.message === 'Authentication required') {
      return {
        content: [{
          type: "text",
          text: "Authentication required. Please use the 'authenticate' tool first."
        }]
      };
    }

    return {
      content: [{
        type: "text",
        text: `Error creating folder: ${error.message}`
      }]
    };
  }
}

/**
 * Create a new mail folder
 */
async function createMailFolder(accessToken, folderName, parentFolderName, mb) {
  const opts = { headers: withMailboxHeaders(mb) };
  try {
    const existingFolder = await getFolderIdByName(accessToken, folderName, mb);
    if (existingFolder) {
      return {
        success: false,
        message: `A folder named "${folderName}" already exists${mb.kind === 'user' ? ` in ${mb.smtpOrUpn}` : ''}.`
      };
    }

    let endpoint = buildPath(mb, 'mailFolders');
    if (parentFolderName) {
      const parentId = await getFolderIdByName(accessToken, parentFolderName, mb);
      if (!parentId) {
        return {
          success: false,
          message: `Parent folder "${parentFolderName}" not found. Please specify a valid parent folder or leave it blank to create at the root level.`
        };
      }

      endpoint = buildPath(mb, `mailFolders/${parentId}/childFolders`);
    }

    const folderData = {
      displayName: folderName
    };

    const response = await callGraphAPI(
      accessToken,
      'POST',
      endpoint,
      folderData,
      null,
      opts
    );

    if (response && response.id) {
      const locationInfo = parentFolderName
        ? `inside "${parentFolderName}"`
        : "at the root level";
      const mailboxInfo = mb.kind === 'user' ? ` (mailbox: ${mb.smtpOrUpn})` : '';

      return {
        success: true,
        message: `Successfully created folder "${folderName}" ${locationInfo}${mailboxInfo}.`,
        folderId: response.id
      };
    } else {
      return {
        success: false,
        message: "Failed to create folder. The server didn't return a folder ID."
      };
    }
  } catch (error) {
    console.error(`Error creating folder "${folderName}": ${error.message}`);
    throw error;
  }
}

module.exports = handleCreateFolder;