import os
import json
import gspread
from google.oauth2.service_account import Credentials

# Client-specific Sheet configuration — swapped per client within the
# adventure_travel vertical. Ported unchanged from the legacy app.py.
SHEET_ID = os.getenv('SHEET_ID')
STANDARD_TAB = os.getenv('STANDARD_TAB', 'Standard Competitive Tab')
NGS_TAB = os.getenv('NGS_TAB', 'NGS Competitive Tab')
SERVICE_ACCOUNT_JSON = os.getenv('GOOGLE_SERVICE_ACCOUNT_JSON')


def get_sheet_client():
    """Authorizes a gspread client against the Google service account credentials."""
    scopes = [
        'https://www.googleapis.com/auth/spreadsheets',
        'https://www.googleapis.com/auth/drive',
    ]
    info = json.loads(SERVICE_ACCOUNT_JSON)
    creds = Credentials.from_service_account_info(info, scopes=scopes)
    return gspread.authorize(creds)


def write_to_sheet(tab_name, col_index, data, fields):
    """
    Writes one competitor's extracted fields into a single column of
    the client Sheet, using the field→row map for this tab type
    (STANDARD_FIELDS or NGS_FIELDS).

    Data flow:
      tab_name + col_index + extracted data dict + field row map →
      batch_update() with one cell write per non-empty field →
      Sheet updated in a single API call
    """
    client = get_sheet_client()
    sheet = client.open_by_key(SHEET_ID)
    ws = sheet.worksheet(tab_name)
    updates = []
    for field, row in fields.items():
        value = data.get(field)
        if value is None or value == '':
            continue
        updates.append({
            'range': gspread.utils.rowcol_to_a1(row, col_index),
            'values': [[value]],
        })
    if updates:
        ws.batch_update(updates)


def get_competitors_from_db():
    """Reads the client's 'Competitor DB' tab and returns only the active rows."""
    client = get_sheet_client()
    sheet = client.open_by_key(SHEET_ID)
    ws = sheet.worksheet('Competitor DB')
    rows = ws.get_all_records()
    return [
        {'style': r['Travel Style'], 'name': r['Competitor Name'], 'url': r['Website URL'], 'active': r['Active']}
        for r in rows
        if str(r.get('Active', '')).strip().lower() == 'yes'
    ]