#!/usr/bin/env node

import { google } from 'googleapis';
import minimist from 'minimist';
import { getAuthClient, parseAccountArg } from './auth/auth-utils.js';
import { logAction } from './action-logger.js';

function createEmailMessage(to, subject, body, options = {}) {
  const { cc, bcc, html, replyTo } = options;

  const headers = [
    `To: ${to}`,
    `Subject: ${subject}`,
  ];

  if (cc) headers.push(`Cc: ${cc}`);
  if (bcc) headers.push(`Bcc: ${bcc}`);
  if (replyTo) headers.push(`Reply-To: ${replyTo}`);

  headers.push('Content-Type: text/html; charset=utf-8');
  headers.push('');

  const message = headers.join('\r\n') + (html || body);

  return Buffer.from(message)
    .toString('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=+$/, '');
}

async function manageDrafts(args) {
  const action = args.action || args.a;

  if (!action) {
    throw new Error('Missing required argument: --action (list|create|update|send|delete)');
  }

  // Get authenticated client for specified account (or default)
  const accountId = parseAccountArg(args);
  const oauth2Client = await getAuthClient(accountId);

  const gmail = google.gmail({ version: 'v1', auth: oauth2Client });

  switch (action) {
    case 'list': {
      const response = await gmail.users.drafts.list({
        userId: 'me',
        maxResults: args.limit || 10
      });

      if (!response.data.drafts) {
        return {
          success: true,
          action: 'list',
          count: 0,
          drafts: []
        };
      }

      // Get details for each draft
      const drafts = await Promise.all(
        response.data.drafts.map(async (draft) => {
          const details = await gmail.users.drafts.get({
            userId: 'me',
            id: draft.id
          });

          const headers = details.data.message.payload.headers;
          const getHeader = (name) => headers.find(h => h.name === name)?.value || '';

          return {
            id: draft.id,
            messageId: details.data.message.id,
            to: getHeader('To'),
            subject: getHeader('Subject'),
            snippet: details.data.message.snippet
          };
        })
      );

      return {
        success: true,
        action: 'list',
        count: drafts.length,
        drafts: drafts
      };
    }

    case 'create': {
      if (!args.to || !args.subject) {
        throw new Error('--to and --subject are required for create action');
      }

      const encodedMessage = createEmailMessage(
        args.to,
        args.subject,
        args.body || '',
        {
          cc: args.cc,
          bcc: args.bcc,
          html: args.html,
          replyTo: args['reply-to']
        }
      );

      const response = await gmail.users.drafts.create({
        userId: 'me',
        requestBody: {
          message: {
            raw: encodedMessage
          }
        }
      });

      return {
        success: true,
        action: 'create',
        draftId: response.data.id,
        to: args.to,
        subject: args.subject
      };
    }

    case 'update': {
      if (!args.id) {
        throw new Error('--id (draft ID) is required for update action');
      }

      if (!args.to || !args.subject) {
        throw new Error('--to and --subject are required for update action');
      }

      const encodedMessage = createEmailMessage(
        args.to,
        args.subject,
        args.body || '',
        {
          cc: args.cc,
          bcc: args.bcc,
          html: args.html,
          replyTo: args['reply-to']
        }
      );

      const response = await gmail.users.drafts.update({
        userId: 'me',
        id: args.id,
        requestBody: {
          message: {
            raw: encodedMessage
          }
        }
      });

      return {
        success: true,
        action: 'update',
        draftId: response.data.id,
        to: args.to,
        subject: args.subject
      };
    }

    case 'send': {
      if (!args.id) {
        throw new Error('--id (draft ID) is required for send action');
      }

      const response = await gmail.users.drafts.send({
        userId: 'me',
        requestBody: {
          id: args.id
        }
      });

      return {
        success: true,
        action: 'send',
        draftId: args.id,
        messageId: response.data.id,
        threadId: response.data.threadId
      };
    }

    case 'delete': {
      if (!args.id) {
        throw new Error('--id (draft ID) is required for delete action');
      }

      await gmail.users.drafts.delete({
        userId: 'me',
        id: args.id
      });

      return {
        success: true,
        action: 'delete',
        draftId: args.id
      };
    }

    default:
      throw new Error(`Unknown action: ${action}. Use: list, create, update, send, or delete`);
  }
}

// Main execution
const args = minimist(process.argv.slice(2));
const startTime = Date.now();

manageDrafts(args)
  .then(result => {
    // Log the action
    logAction('drafts', args, result, {
      account: args.account || 'default',
      duration: Date.now() - startTime,
      draftAction: result.action
    });

    console.log(JSON.stringify(result, null, 2));
  })
  .catch(error => {
    const errorResult = {
      success: false,
      error: error.message
    };

    // Log the failed action
    logAction('drafts', args, errorResult, {
      account: args.account || 'default',
      duration: Date.now() - startTime,
      failed: true
    });

    console.error(JSON.stringify(errorResult, null, 2));
    process.exit(1);
  });