# Copyright (c) 2024 The Brave Authors. All rights reserved.
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at https://mozilla.org/MPL/2.0/.
import logging
import os
import shutil
import json

from typing import Dict, List, Optional

import components.path_util as path_util

from components.perf_test_utils import GetProcessOutput

GH_BRAVE_CORE_GIT_URL = 'git@github.com:brave/brave-core.git'
GH_BRAVE_VARIATIONS_GIT_URL = 'git@github.com:brave/brave-variations.git'
GH_BRAVE_PERF_TEAM = 'brave/perf-team'


def DoesPrOpen(branch: str, target: Optional[str] = None):
  args = ['gh', 'pr', 'list', '--head', branch, '--json', 'number']
  if target is not None:
    args.extend(['--base', target])
  _, output = GetProcessOutput(args, cwd=path_util.GetBraveDir(), check=True)
  pr_list = json.loads(output)
  assert isinstance(pr_list, list)
  return len(pr_list) > 0


def MakeGithubPR(branch: str, target: str, title: str, body: str,
                 extra_args: List[str], reviewers: List[str]):
  args = [
      'gh', 'pr', 'create', '--base', target, '--head', branch, '--title',
      title, '--body', body
  ]
  for reviewer in reviewers:
    args.extend(['--reviewer', reviewer])
  for arg in extra_args:
    args.append(arg)
  return GetProcessOutput(args, cwd=path_util.GetBraveDir())


def PushChangesToBranch(files: Dict[str, str],
                        branch: str,
                        commit_message: str,
                        cwd=path_util.GetBraveDir()):
  # Make a few attempts to rebase if non fast-forward
  for attempt in range(3):
    logging.info('Pushing changes to branch %s #%d', branch, attempt)
    branch_exists, _ = GetProcessOutput(
        ['git', 'fetch', GH_BRAVE_CORE_GIT_URL, branch], cwd)
    if branch_exists:
      GetProcessOutput(['git', 'checkout', '-f', 'FETCH_HEAD'], cwd, check=True)

    GetProcessOutput(['git', 'checkout', '-B', branch], cwd, check=True)
    for local_file, stage_path in files.items():
      assert os.path.isfile(local_file)
      shutil.copy(local_file, stage_path)
      GetProcessOutput(['git', 'add', stage_path], cwd, check=True)

    GetProcessOutput(['git', 'commit', '-m', f'{commit_message}'],
                     cwd,
                     check=True)

    # Use environment variables for GitHub username and auth token
    github_username = os.environ.get('GITHUB_USERNAME')
    github_token = os.environ.get('GITHUB_TOKEN')

    if not github_username or not github_token:
      raise ValueError(
          "GitHub username or token not set in environment variables")

    # Construct the URL with authentication
    auth_url = f'https://{github_username}:{github_token}@github.com/brave/brave-core.git'

    success, _ = GetProcessOutput(
        ['git', 'push', auth_url, f'{branch}:{branch}'], cwd)
    if success:
      return

  raise RuntimeError(f'Can\'t push changes to branch {branch}')

def GetFileAtRevision(
    filepath: str, revision: str, cwd=path_util.GetBraveDir()) -> Optional[str]:
  if os.path.isabs(filepath):
    filepath = os.path.relpath(filepath, cwd)
  normalized_path = filepath.replace('\\', '/')
  success, content = GetProcessOutput(
      ['git', 'show', f'{revision}:{normalized_path}'],
      cwd,
      output_to_debug=False)
  return content if success else None


def Clone(url: str, branch: Optional[str], target_dir: str) -> None:
  args = ['git', 'clone', url, target_dir]
  if branch:
    args.extend(['--branch', branch])
  GetProcessOutput(args, path_util.GetBraveDir(), check=True)


def EnsureRepositoryUpdated(url: str, branch: str, directory: str) -> None:
  if not os.path.exists(directory):
    Clone(url, branch, directory)
    return

  GetProcessOutput(['git', 'fetch', url, branch], directory, check=True)
  GetProcessOutput(['git', 'checkout', 'FETCH_HEAD'], directory, check=True)


def EnsureRevision(revision: str, cwd=path_util.GetBraveDir()) -> None:
  args = ['git', 'show', f'{revision}', '-q']
  ok, _ = GetProcessOutput(args, cwd)
  if ok:
    return
  logging.debug('Try to fetch %s', revision)
  ok, _ = GetProcessOutput(['git', 'fetch', 'origin', f'{revision}:{revision}'],
                           cwd)
  if ok:
    return

  if cwd == path_util.GetBraveDir():
    ok, _ = GetProcessOutput(
        ['git', 'fetch', GH_BRAVE_CORE_GIT_URL, f'{revision}:{revision}'], cwd)
    if ok:
      return

  raise RuntimeError(f'Can\'t fetch revision {revision}')


def GetCommitDate(revision: str, cwd=path_util.GetBraveDir()) -> str:
  _, output = GetProcessOutput(['git', 'show', '-s', '--format=%ci', revision],
                               cwd,
                               check=True)
  commit_date = output.rstrip().split('\n')[-1]
  return commit_date


def GetRevisionFromDate(date: str, branch: str,
                        cwd=path_util.GetBraveDir()) -> str:
  # fetch the branch:
  GetProcessOutput(['git', 'fetch', 'origin', branch], cwd, check=True)

  args = ['git', 'rev-list', 'FETCH_HEAD', '-n', '1', '--first-parent']
  if date:
    args.append(f'--before={date}')
  _, output = GetProcessOutput(args, cwd, check=True)
  return output.rstrip()


def GetGitHash(revision: str, cwd=path_util.GetBraveDir()) -> str:
  _, git_hash_output = GetProcessOutput(
      ['git', 'rev-list', '-n', '1', revision], cwd, check=True)
  return git_hash_output.rstrip()


def GetRevisionNumber(revision: str, cwd=path_util.GetBraveDir()) -> str:
  """Returns the number of "primary" commits from the begging to `revision`.
  Use this to get the commit from a revision number:
  git rev-list --topo-order --first-parent --reverse origin/master
  | head -n <rev_num> | tail -n 1 | git log -n 1 --stdin
  """

  rev_number_args = [
      'git', 'rev-list', '--topo-order', '--first-parent', '--count', revision
  ]

  _, rev_number_output = GetProcessOutput(rev_number_args, cwd, check=True)

  return rev_number_output.rstrip()