"""
CSV export — Activation Calendar format.
Mirrors the export logic from script.js in ac-helper.
"""

import csv
import io
import logging

from quart import Blueprint, make_response

from ..auth.middleware import auth_required, get_user_id
from ..sheets.manager import load_sheet_data

logger = logging.getLogger(__name__)

export_bp = Blueprint('export', __name__, url_prefix='/api/sheets')

# Activation Calendar column order
AC_HEADERS = [
    'Number', 'Title', 'Status', 'Category', 'Media', 'Sub media',
    'Destination', 'Format', 'Supply date', 'Live date', 'End date',
    'Special instructions', 'Language', 'Country', 'Quantity',
]


@export_bp.route('/<sheet_id>/export', methods=['GET'])
@auth_required
async def export_csv(sheet_id: str):
    user_id = get_user_id()
    data = load_sheet_data(user_id, sheet_id)
    if data is None:
        return {'error': 'not_found'}, 404

    output = io.StringIO()
    writer = csv.DictWriter(output, fieldnames=AC_HEADERS, extrasaction='ignore')
    writer.writeheader()

    for row in data:
        writer.writerow({
            'Number': '',  # cleared on export
            'Title': row.get('Title', ''),
            'Status': row.get('Status', ''),
            'Category': row.get('Category', ''),
            'Media': row.get('Media', ''),
            'Sub media': row.get('Sub-media', ''),
            'Destination': '',
            'Format': row.get('Format', ''),
            'Supply date': row.get('Supply date', ''),
            'Live date': row.get('Live date', ''),
            'End date': '',
            'Special instructions': '',
            'Language': row.get('Language', ''),
            'Country': row.get('Country', ''),
            'Quantity': '1.00',
        })

    csv_content = output.getvalue()
    response = await make_response(csv_content)
    response.headers['Content-Type'] = 'text/csv'
    response.headers['Content-Disposition'] = f'attachment; filename="activation_calendar_{sheet_id}.csv"'
    return response