import base64
import requests
from urllib.parse import urlparse


def split_link(repo_link):
    """Разбирает ссылку вида https://gitea.com/user/repo."""
    repo_link = repo_link.strip().rstrip("/")
    parsed = urlparse(repo_link)

    if not parsed.scheme or not parsed.netloc:
        raise ValueError("Введите полную ссылку, например: https://gitea.com/user/repo")

    parts = [p for p in parsed.path.split("/") if p]
    if len(parts) < 2:
        raise ValueError("Ссылка должна быть вида: https://site/user/repo")

    base_url = f"{parsed.scheme}://{parsed.netloc}"
    owner = parts[0]
    repo = parts[1]
    return base_url, owner, repo


def _get_json(url):
    response = requests.get(url, timeout=15)
    if response.status_code != 200:
        raise Exception(f"Ошибка запроса: {response.status_code}\n{url}")
    return response.json()


def get_repo_data(repo_link):
    base_url, owner, repo = split_link(repo_link)
    url = f"{base_url}/api/v1/repos/{owner}/{repo}"
    return _get_json(url)


def get_commits(repo_link):
    base_url, owner, repo = split_link(repo_link)
    url = f"{base_url}/api/v1/repos/{owner}/{repo}/commits"
    data = _get_json(url)
    if isinstance(data, list):
        return data
    return []


def get_code_lines(repo_link):
    """Считает строки Python-кода в ветке main/master."""
    base_url, owner, repo = split_link(repo_link)
    total_lines = 0

    # У разных репозиториев может быть main или master.
    for branch in ("main", "master"):
        tree_url = f"{base_url}/api/v1/repos/{owner}/{repo}/git/trees/{branch}?recursive=1"
        try:
            data = _get_json(tree_url)
            break
        except Exception:
            data = None

    if not data:
        return 0

    for file in data.get("tree", []):
        if file.get("type") != "blob":
            continue

        path = file.get("path", "")
        if not path.endswith(".py"):
            continue

        file_url = f"{base_url}/api/v1/repos/{owner}/{repo}/contents/{path}"
        try:
            file_data = _get_json(file_url)
            content = file_data.get("content")
            if content:
                decoded = base64.b64decode(content).decode("utf-8", errors="ignore")
                total_lines += len(decoded.splitlines())
        except Exception:
            continue

    return total_lines