#!/usr/bin/env python3

import os
import json
import logging
import sys
import time

import requests

from ci_config import CI_CONFIG

DOWNLOAD_RETRIES_COUNT = 5

def get_build_name_for_check(check_name):
    return CI_CONFIG['tests_config'][check_name]['required_build']

def get_build_urls(build_name, reports_path):
    for root, _, files in os.walk(reports_path):
        for f in files:
            if build_name in f :
                logging.info("Found build report json %s", f)
                with open(os.path.join(root, f), 'r', encoding='utf-8') as file_handler:
                    build_report = json.load(file_handler)
                    return build_report['build_urls']
    return []

def dowload_build_with_progress(url, path):
    logging.info("Downloading from %s to temp path %s", url, path)
    for i in range(DOWNLOAD_RETRIES_COUNT):
        try:
            with open(path, 'wb') as f:
                response = requests.get(url, stream=True)
                response.raise_for_status()
                total_length = response.headers.get('content-length')
                if total_length is None or int(total_length) == 0:
                    logging.info("No content-length, will download file without progress")
                    f.write(response.content)
                else:
                    dl = 0
                    total_length = int(total_length)
                    logging.info("Content length is %ld bytes", total_length)
                    for data in response.iter_content(chunk_size=4096):
                        dl += len(data)
                        f.write(data)
                        if sys.stdout.isatty():
                            done = int(50 * dl / total_length)
                            percent = int(100 * float(dl) / total_length)
                            eq_str = '=' * done
                            space_str = ' ' * (50 - done)
                            sys.stdout.write(f"\r[{eq_str}{space_str}] {percent}%")
                            sys.stdout.flush()
            break
        except Exception as ex:
            sys.stdout.write("\n")
            time.sleep(3)
            logging.info("Exception while downloading %s, retry %s", ex, i + 1)
            if os.path.exists(path):
                os.remove(path)
    else:
        raise Exception(f"Cannot download dataset from {url}, all retries exceeded")

    sys.stdout.write("\n")
    logging.info("Downloading finished")


def download_builds(result_path, build_urls, filter_fn):
    for url in build_urls:
        if filter_fn(url):
            fname = os.path.basename(url.replace('%2B', '+').replace('%20', ' '))
            logging.info("Will download %s to %s", fname, result_path)
            dowload_build_with_progress(url, os.path.join(result_path, fname))

def download_builds_filter(check_name, reports_path, result_path, filter_fn=lambda _: True):
    build_name = get_build_name_for_check(check_name)
    urls = get_build_urls(build_name, reports_path)
    print(urls)

    if not urls:
        raise Exception("No build URLs found")

    download_builds(result_path, urls, filter_fn)

def download_all_deb_packages(check_name, reports_path, result_path):
    download_builds_filter(check_name, reports_path, result_path, lambda x: x.endswith('deb'))

def download_shared_build(check_name, reports_path, result_path):
    download_builds_filter(check_name, reports_path, result_path, lambda x: x.endswith('shared_build.tgz'))

def download_unit_tests(check_name, reports_path, result_path):
    download_builds_filter(check_name, reports_path, result_path, lambda x: x.endswith('unit_tests_dbms'))

def download_clickhouse_binary(check_name, reports_path, result_path):
    download_builds_filter(check_name, reports_path, result_path, lambda x: x.endswith('clickhouse'))