#!/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';

async function updateEvent(args) {
  // Validate required args
  if (!args.id && !args.eventId) {
    throw new Error('Missing required argument: --id or --eventId (event ID)');
  }

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

  const calendar = google.calendar({ version: 'v3', auth: oauth2Client });

  const eventId = args.id || args.eventId;
  const calendarId = args.calendar || 'primary';

  // Build update object with only provided fields
  const updates = {};

  if (args.summary || args.title) {
    updates.summary = args.summary || args.title;
  }

  if (args.description || args.desc) {
    updates.description = args.description || args.desc;
  }

  if (args.location || args.loc) {
    updates.location = args.location || args.loc;
  }

  // Handle time updates
  if (args.start || args.end) {
    const timezone = args.timezone || args.tz || 'America/Los_Angeles';

    if (args.start) {
      updates.start = {
        dateTime: args.start,
        timeZone: timezone
      };
    }

    if (args.end) {
      updates.end = {
        dateTime: args.end,
        timeZone: timezone
      };
    }
  }

  // Handle attendees update
  if (args.attendees) {
    updates.attendees = args.attendees.split(',').map(email => ({
      email: email.trim()
    }));
  }

  // Handle adding attendees (preserves existing)
  if (args.addAttendees) {
    // First get current event to preserve existing attendees
    const current = await calendar.events.get({ calendarId, eventId });
    const existingAttendees = current.data.attendees || [];
    const newAttendees = args.addAttendees.split(',').map(email => ({
      email: email.trim()
    }));
    updates.attendees = [...existingAttendees, ...newAttendees];
  }

  // Handle removing attendees
  if (args.removeAttendees) {
    const current = await calendar.events.get({ calendarId, eventId });
    const existingAttendees = current.data.attendees || [];
    const toRemove = args.removeAttendees.split(',').map(e => e.trim().toLowerCase());
    updates.attendees = existingAttendees.filter(
      att => !toRemove.includes(att.email.toLowerCase())
    );
  }

  // Optional color
  if (args.colorId) {
    updates.colorId = args.colorId;
  }

  // Optional visibility
  if (args.visibility) {
    updates.visibility = args.visibility;
  }

  // Optional status (confirmed, tentative, cancelled)
  if (args.status) {
    updates.status = args.status;
  }

  // Check if any updates were provided
  if (Object.keys(updates).length === 0) {
    throw new Error('No update fields provided. Use --summary, --description, --location, --start, --end, --attendees, etc.');
  }

  // Use patch for partial updates (more efficient)
  const result = await calendar.events.patch({
    calendarId,
    eventId,
    resource: updates
  });

  return {
    success: true,
    eventId: result.data.id,
    htmlLink: result.data.htmlLink,
    summary: result.data.summary,
    start: result.data.start,
    end: result.data.end,
    location: result.data.location,
    attendees: result.data.attendees,
    updated: result.data.updated
  };
}

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

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

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

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

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