#!/usr/bin/env python3

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import requests
import json
from datetime import datetime, timedelta
import os
import otc_metadata.services
import argparse
import logging

# ===== Configuration =====
USERNAME = os.getenv("UMAMI_USERNAME")
PASSWORD = os.getenv("UMAMI_PASSWORD")
OUTPUT_FILE = "stats.json"

# ===== Data =====
blacklist = [
    "ed",
    "sd"
]

# ===== Logger =====

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)


def parse_args():
    """
    Command-line arguments
    """
    parser = argparse.ArgumentParser(description="Analytics Script")
    parser.add_argument(
        "--base-url",
        default="https://analytics.otc-service.com",
        help="Base_Url of analytics server"
    )
    parser.add_argument(
        "--cloud-environment",
        default="eu_de",
        choices=['eu_de', 'swiss'],
        help="Cloud Environments (default: eu_de)"
    )
    parser.add_argument(
        "--environment",
        default=['public'],
        nargs='+',
        choices=['public', 'internal', 'hidden'],
        help="Environments (default: ['public'])"
    )
    parser.add_argument(
        "--limit",
        type=int,
        default=10,
        help="Result count"
    )
    parser.add_argument(
        "--website-id",
        required=True,
        help="Umami Website ID"
    )

    return parser.parse_args()


def get_umami_token(base_url):
    """Get Bearer-Token from Umami-API."""
    url = f"{base_url}/api/auth/login"
    response = requests.post(url, json={"username": USERNAME, "password": PASSWORD})
    response.raise_for_status()
    return response.json().get("token")


def get_4_weeks_range():
    """Calculates start and end of 4 weeks range in UNIX timestamp format."""
    end_date = datetime.utcnow()
    start_date = end_date - timedelta(weeks=4)

    start_ts = int(start_date.timestamp() * 1000)
    end_ts = int(end_date.timestamp() * 1000)
    return start_ts, end_ts


def fetch_pageviews(token, start_ts, end_ts, website_id, base_url):
    """Retrieves statistics from API server."""
    headers = {"Authorization": f"Bearer {token}"}
    url = f"{base_url}/api/websites/{website_id}/metrics"
    params = {
        "type": "url",
        "startAt": start_ts,
        "endAt": end_ts
    }

    response = requests.get(url, headers=headers, params=params)
    response.raise_for_status()
    return response


def filter_unique_service_types(stats, cloud_environment, environment, limit):
    """
    Filter stats and return unique service_type values that exist in metadata,
    skip blacklisted service types, and limit results to `limit` entries.
    """
    services = otc_metadata.services.Services().all_services_by_cloud_environment(
        cloud_environment=cloud_environment,
        environments=environment
    )

    # Map service_uri -> service_type
    uri_to_type = {s["service_uri"]: s["service_type"] for s in services}

    seen_types = set()
    filtered = []

    for entry in stats.json():
        url_path = entry["x"]

        for service_uri, service_type in uri_to_type.items():
            if f"/{service_uri}" in url_path and service_type not in seen_types:
                if service_type in blacklist:
                    continue

                filtered.append(service_type)
                seen_types.add(service_type)

                if len(filtered) >= limit:
                    return filtered
                break

    return filtered


def save_to_file(data, environment, cloud_environment):
    """
    Saves data in the folder ./analytics/<environment>/<cloud_environment>.json
    """
    folder = os.path.join("otc_metadata", "analytics", environment)
    os.makedirs(folder, exist_ok=True)

    filename = os.path.join(folder, f"{cloud_environment}.json")
    abs_path = os.path.abspath(filename)

    with open(filename, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

    logger.info(f"✅ Data saved in: {abs_path}")


def main():
    try:
        args = parse_args()
        token = get_umami_token(base_url=args.base_url)
        start_ts, end_ts = get_4_weeks_range()
        stats = fetch_pageviews(token, start_ts, end_ts, website_id=args.website_id, base_url=args.base_url)
        filtered_stats = filter_unique_service_types(
            stats=stats,
            cloud_environment=args.cloud_environment,
            environment=args.environment,
            limit=args.limit
        )
        save_to_file(
            data=filtered_stats,
            environment=args.environment[0],
            cloud_environment=args.cloud_environment
        )
    except Exception as e:
        logger.error(f"Error: {e}")
        raise


if __name__ == "__main__":
    main()