"""
Script to fetch issues from the transformers repo and save them to a json file

The script can be run from the command line with the following arguments:
            --update: Whether to update the existing file. If True the script will fetch
                the most recent issues and append them to the file
            --overwrite: Whether to overwrite the existing file
            --output_filename: The name of the output file
            --github_api_version: The version of the GitHub API to use
            --owner: The owner of the repo
            --repo: The name of the repo
            --token: The GitHub token to use
            --n_pages: The number of pages to fetch. Useful for testing

"""

import argparse
import logging
import json
import os

import requests
import numpy as np

from defaults import OWNER, REPO, GITHUB_API_VERSION, TOKEN, ISSUE_JSON_FILE

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

UPDATE_FILE = True
OVERWRITE_FILE = False


def get_last_entry(file_path):
    with open(file_path, 'r') as file:
        # Read the last line
        last_line = file.readlines()[-1]
    return json.loads(last_line)


def get_last_issue_number(file_path):
    if os.path.exists(file_path):
        last_entry = get_last_entry(file_path=file_path)
        return last_entry['number']
    return 0


def get_issues(
    overwrite=OVERWRITE_FILE,
    update=UPDATE_FILE,
    output_filename=ISSUE_JSON_FILE,
    github_api_version=GITHUB_API_VERSION,
    owner=OWNER,
    repo=REPO,
    token=TOKEN,
    n_pages=-1,
):
    """
    Function to get the issues from the transformers repo and save them to a json file
    """

    # If file exists and we want to overwrite it, delete it
    if os.path.exists(output_filename) and overwrite:
        logging.info(f"Deleting file {output_filename}")
        os.remove(output_filename)

    # Define the URL and headers
    url = f"https://api.github.com/repos/{owner}/{repo}/issues"
    headers = {
        "Accept": "application/vnd.github+json",
        "Authorization": f"{token}",
        "X-GitHub-Api-Version": f"{github_api_version}",
        "User-Agent": "amyeroberts",
    }
    last_issue_number = get_last_issue_number(file_path=output_filename)
    per_page = 100

    if os.path.exists(output_filename):
        with open(output_filename, "r") as f:
            num_lines = sum(1 for line in f)
    else:
        num_lines = 0

    # Get the number of pages
    page = num_lines // per_page + 1
    query_params = {
        "state": "all",
        "per_page": per_page,
        "sort": "created",
        "direction": "asc",
        "page": page,
    }

    if os.path.exists(output_filename) and not update and not overwrite:
        raise ValueError(f"File {output_filename} already exists")

    page_limit = (n_pages + page) if n_pages > 0 else np.inf
    while True:
        if page >= page_limit:
            break

        # Send the GET request
        response = requests.get(url, headers=headers, params=query_params)

        if not response.status_code == 200:
            raise ValueError(
                f"Request failed with status code {response.status_code} and message {response.text}"
            )

        json_response = response.json()
        logger.info(f"Page: {page}, number of issues: {len(json_response)}")

        # If we get an empty response, we've reached the end of the issues
        if len(json_response) == 0:
            break

        with open(output_filename, "a") as f:
            for value in json_response:
                if value["number"] <= last_issue_number:
                    continue
                json.dump(value, f)
                f.write("\n")

        if len(json_response) < per_page:
            break

        page += 1
        query_params["page"] = page

    return output_filename


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--update", action="store_true", default=UPDATE_FILE)
    parser.add_argument("--overwrite", action="store_true", default=OVERWRITE_FILE)
    parser.add_argument("--output_filename", type=str, default=ISSUE_JSON_FILE)
    parser.add_argument("--github_api_version", type=str, default=GITHUB_API_VERSION)
    parser.add_argument("--owner", type=str, default=OWNER)
    parser.add_argument("--repo", type=str, default=REPO)
    parser.add_argument("--token", type=str, default=TOKEN)
    parser.add_argument("--n_pages", type=int, default=-1)
    args = parser.parse_args()
    get_issues(**vars(args))