import hashlib
import itertools
import time
import traceback
from datetime import datetime
from typing import Optional, Tuple
from urllib.parse import urlparse

from github import AppAuthentication, Auth, Github
from retry import retry
from starlette_context import context

from ..algo.file_filter import filter_ignored
from ..algo.language_handler import is_valid_file
from ..algo.types import EDIT_TYPE
from ..algo.utils import (PRReviewHeader, Range, clip_tokens,
                          find_line_number_of_relevant_line_in_file,
                          load_large_diff)
from ..config_loader import get_settings
from ..log import get_logger
from ..servers.utils import RateLimitExceeded
from .git_provider import (MAX_FILES_ALLOWED_FULL, FilePatchInfo, GitProvider,
                           IncrementalPR)


class GithubProvider(GitProvider):
    def __init__(self, pr_url: Optional[str] = None):
        self.repo_obj = None
        try:
            self.installation_id = context.get("installation_id", None)
        except Exception:
            self.installation_id = None
        self.max_comment_chars = 65000
        self.base_url = get_settings().get("GITHUB.BASE_URL", "https://api.github.com").rstrip("/") # "https://api.github.com"
        self.base_url_html = self.base_url.split("api/")[0].rstrip("/") if "api/" in self.base_url else "https://github.com"
        self.github_client = self._get_github_client()
        self.repo = None
        self.pr_num = None
        self.pr = None
        self.github_user_id = None
        self.diff_files = None
        self.git_files = None
        self.incremental = IncrementalPR(False)
        if pr_url and 'pull' in pr_url:
            self.set_pr(pr_url)
            self.pr_commits = list(self.pr.get_commits())
            self.last_commit_id = self.pr_commits[-1]
            self.pr_url = self.get_pr_url() # pr_url for github actions can be as api.github.com, so we need to get the url from the pr object
        else:
            self.pr_commits = None

    def get_incremental_commits(self, incremental=IncrementalPR(False)):
        self.incremental = incremental
        if self.incremental.is_incremental:
            self.unreviewed_files_set = dict()
            self._get_incremental_commits()

    def is_supported(self, capability: str) -> bool:
        return True

    def get_pr_url(self) -> str:
        return self.pr.html_url

    def set_pr(self, pr_url: str):
        self.repo, self.pr_num = self._parse_pr_url(pr_url)
        self.pr = self._get_pr()

    def _get_incremental_commits(self):
        if not self.pr_commits:
            self.pr_commits = list(self.pr.get_commits())

        self.previous_review = self.get_previous_review(full=True, incremental=True)
        if self.previous_review:
            self.incremental.commits_range = self.get_commit_range()
            # Get all files changed during the commit range

            for commit in self.incremental.commits_range:
                if commit.commit.message.startswith(f"Merge branch '{self._get_repo().default_branch}'"):
                    get_logger().info(f"Skipping merge commit {commit.commit.message}")
                    continue
                self.unreviewed_files_set.update({file.filename: file for file in commit.files})
        else:
            get_logger().info("No previous review found, will review the entire PR")
            self.incremental.is_incremental = False

    def get_commit_range(self):
        last_review_time = self.previous_review.created_at
        first_new_commit_index = None
        for index in range(len(self.pr_commits) - 1, -1, -1):
            if self.pr_commits[index].commit.author.date > last_review_time:
                self.incremental.first_new_commit = self.pr_commits[index]
                first_new_commit_index = index
            else:
                self.incremental.last_seen_commit = self.pr_commits[index]
                break
        return self.pr_commits[first_new_commit_index:] if first_new_commit_index is not None else []

    def get_previous_review(self, *, full: bool, incremental: bool):
        if not (full or incremental):
            raise ValueError("At least one of full or incremental must be True")
        if not getattr(self, "comments", None):
            self.comments = list(self.pr.get_issue_comments())
        prefixes = []
        if full:
            prefixes.append(PRReviewHeader.REGULAR.value)
        if incremental:
            prefixes.append(PRReviewHeader.INCREMENTAL.value)
        for index in range(len(self.comments) - 1, -1, -1):
            if any(self.comments[index].body.startswith(prefix) for prefix in prefixes):
                return self.comments[index]

    def get_files(self):
        if self.incremental.is_incremental and self.unreviewed_files_set:
            return self.unreviewed_files_set.values()
        try:
            git_files = context.get("git_files", None)
            if git_files:
                return git_files
            self.git_files = list(self.pr.get_files()) # 'list' to handle pagination
            context["git_files"] = self.git_files
            return self.git_files
        except Exception:
            if not self.git_files:
                self.git_files = list(self.pr.get_files())
            return self.git_files

    def get_num_of_files(self):
        if hasattr(self.git_files, "totalCount"):
            return self.git_files.totalCount
        else:
            try:
                return len(self.git_files)
            except Exception as e:
                return -1

    @retry(exceptions=RateLimitExceeded,
           tries=get_settings().github.ratelimit_retries, delay=2, backoff=2, jitter=(1, 3))
    def get_diff_files(self) -> list[FilePatchInfo]:
        """
        Retrieves the list of files that have been modified, added, deleted, or renamed in a pull request in GitHub,
        along with their content and patch information.

        Returns:
            diff_files (List[FilePatchInfo]): List of FilePatchInfo objects representing the modified, added, deleted,
            or renamed files in the merge request.
        """
        try:
            try:
                diff_files = context.get("diff_files", None)
                if diff_files:
                    return diff_files
            except Exception:
                pass

            if self.diff_files:
                return self.diff_files

            # filter files using [ignore] patterns
            files_original = self.get_files()
            files = filter_ignored(files_original)
            if files_original != files:
                try:
                    names_original = [file.filename for file in files_original]
                    names_new = [file.filename for file in files]
                    get_logger().info(f"Filtered out [ignore] files for pull request:", extra=
                    {"files": names_original,
                     "filtered_files": names_new})
                except Exception:
                    pass

            diff_files = []
            invalid_files_names = []
            counter_valid = 0
            for file in files:
                if not is_valid_file(file.filename):
                    invalid_files_names.append(file.filename)
                    continue

                patch = file.patch

                # allow only a limited number of files to be fully loaded. We can manage the rest with diffs only
                counter_valid += 1
                avoid_load = False
                if counter_valid >= MAX_FILES_ALLOWED_FULL and patch and not self.incremental.is_incremental:
                    avoid_load = True
                    if counter_valid == MAX_FILES_ALLOWED_FULL:
                        get_logger().info(f"Too many files in PR, will avoid loading full content for rest of files")

                if avoid_load:
                    new_file_content_str = ""
                else:
                    new_file_content_str = self._get_pr_file_content(file, self.pr.head.sha)  # communication with GitHub

                if self.incremental.is_incremental and self.unreviewed_files_set:
                    original_file_content_str = self._get_pr_file_content(file, self.incremental.last_seen_commit_sha)
                    patch = load_large_diff(file.filename, new_file_content_str, original_file_content_str)
                    self.unreviewed_files_set[file.filename] = patch
                else:
                    if avoid_load:
                        original_file_content_str = ""
                    else:
                        original_file_content_str = self._get_pr_file_content(file, self.pr.base.sha)
                    if not patch:
                        patch = load_large_diff(file.filename, new_file_content_str, original_file_content_str)

                if file.status == 'added':
                    edit_type = EDIT_TYPE.ADDED
                elif file.status == 'removed':
                    edit_type = EDIT_TYPE.DELETED
                elif file.status == 'renamed':
                    edit_type = EDIT_TYPE.RENAMED
                elif file.status == 'modified':
                    edit_type = EDIT_TYPE.MODIFIED
                else:
                    get_logger().error(f"Unknown edit type: {file.status}")
                    edit_type = EDIT_TYPE.UNKNOWN

                # count number of lines added and removed
                patch_lines = patch.splitlines(keepends=True)
                num_plus_lines = len([line for line in patch_lines if line.startswith('+')])
                num_minus_lines = len([line for line in patch_lines if line.startswith('-')])
                file_patch_canonical_structure = FilePatchInfo(original_file_content_str, new_file_content_str, patch,
                                                               file.filename, edit_type=edit_type,
                                                               num_plus_lines=num_plus_lines,
                                                               num_minus_lines=num_minus_lines,)
                diff_files.append(file_patch_canonical_structure)
            if invalid_files_names:
                get_logger().info(f"Filtered out files with invalid extensions: {invalid_files_names}")

            self.diff_files = diff_files
            try:
                context["diff_files"] = diff_files
            except Exception:
                pass

            return diff_files

        except Exception as e:
            get_logger().error(f"Failing to get diff files: {e}",
                               artifact={"traceback": traceback.format_exc()})
            raise RateLimitExceeded("Rate limit exceeded for GitHub API.") from e

    def publish_description(self, pr_title: str, pr_body: str):
        self.pr.edit(title=pr_title, body=pr_body)

    def get_latest_commit_url(self) -> str:
        return self.last_commit_id.html_url

    def get_comment_url(self, comment) -> str:
        return comment.html_url

    def publish_persistent_comment(self, pr_comment: str,
                                   initial_header: str,
                                   update_header: bool = True,
                                   name='review',
                                   final_update_message=True):
        self.publish_persistent_comment_full(pr_comment, initial_header, update_header, name, final_update_message)

    def publish_comment(self, pr_comment: str, is_temporary: bool = False):
        if is_temporary and not get_settings().config.publish_output_progress:
            get_logger().debug(f"Skipping publish_comment for temporary comment: {pr_comment}")
            return None
        pr_comment = self.limit_output_characters(pr_comment, self.max_comment_chars)
        response = self.pr.create_issue_comment(pr_comment)
        if hasattr(response, "user") and hasattr(response.user, "login"):
            self.github_user_id = response.user.login
        response.is_temporary = is_temporary
        if not hasattr(self.pr, 'comments_list'):
            self.pr.comments_list = []
        self.pr.comments_list.append(response)
        return response

    def publish_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str, original_suggestion=None):
        body = self.limit_output_characters(body, self.max_comment_chars)
        self.publish_inline_comments([self.create_inline_comment(body, relevant_file, relevant_line_in_file)])


    def create_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str,
                              absolute_position: int = None):
        body = self.limit_output_characters(body, self.max_comment_chars)
        position, absolute_position = find_line_number_of_relevant_line_in_file(self.diff_files,
                                                                                relevant_file.strip('`'),
                                                                                relevant_line_in_file,
                                                                                absolute_position)
        if position == -1:
            if get_settings().config.verbosity_level >= 2:
                get_logger().info(f"Could not find position for {relevant_file} {relevant_line_in_file}")
            subject_type = "FILE"
        else:
            subject_type = "LINE"
        path = relevant_file.strip()
        return dict(body=body, path=path, position=position) if subject_type == "LINE" else {}

    def publish_inline_comments(self, comments: list[dict], disable_fallback: bool = False):
        try:
            # publish all comments in a single message
            self.pr.create_review(commit=self.last_commit_id, comments=comments)
        except Exception as e:
            if get_settings().config.verbosity_level >= 2:
                get_logger().error(f"Failed to publish inline comments")

            if (getattr(e, "status", None) == 422
                    and get_settings().github.publish_inline_comments_fallback_with_verification and not disable_fallback):
                pass  # continue to try _publish_inline_comments_fallback_with_verification
            else:
                raise e # will end up with publishing the comments one by one

            try:
                self._publish_inline_comments_fallback_with_verification(comments)
            except Exception as e:
                if get_settings().config.verbosity_level >= 2:
                    get_logger().error(f"Failed to publish inline code comments fallback, error: {e}")
                raise e

    def _publish_inline_comments_fallback_with_verification(self, comments: list[dict]):
        """
        Check each inline comment separately against the GitHub API and discard of invalid comments,
        then publish all the remaining valid comments in a single review.
        For invalid comments, also try removing the suggestion part and posting the comment just on the first line.
        """
        verified_comments, invalid_comments = self._verify_code_comments(comments)

        # publish as a group the verified comments
        if verified_comments:
            try:
                self.pr.create_review(commit=self.last_commit_id, comments=verified_comments)
            except:
                pass

        # try to publish one by one the invalid comments as a one-line code comment
        if invalid_comments and get_settings().github.try_fix_invalid_inline_comments:
            fixed_comments_as_one_liner = self._try_fix_invalid_inline_comments(
                [comment for comment, _ in invalid_comments])
            for comment in fixed_comments_as_one_liner:
                try:
                    self.publish_inline_comments([comment], disable_fallback=True)
                    if get_settings().config.verbosity_level >= 2:
                        get_logger().info(f"Published invalid comment as a single line comment: {comment}")
                except:
                    if get_settings().config.verbosity_level >= 2:
                        get_logger().error(f"Failed to publish invalid comment as a single line comment: {comment}")

    def _verify_code_comment(self, comment: dict):
        is_verified = False
        e = None
        try:
            # event ="" # By leaving this blank, you set the review action state to PENDING
            input = dict(commit_id=self.last_commit_id.sha, comments=[comment])
            headers, data = self.pr._requester.requestJsonAndCheck(
                "POST", f"{self.pr.url}/reviews", input=input)
            pending_review_id = data["id"]
            is_verified = True
        except Exception as err:
            is_verified = False
            pending_review_id = None
            e = err
        if pending_review_id is not None:
            try:
                self.pr._requester.requestJsonAndCheck("DELETE", f"{self.pr.url}/reviews/{pending_review_id}")
            except Exception:
                pass
        return is_verified, e

    def _verify_code_comments(self, comments: list[dict]) -> tuple[list[dict], list[tuple[dict, Exception]]]:
        """Very each comment against the GitHub API and return 2 lists: 1 of verified and 1 of invalid comments"""
        verified_comments = []
        invalid_comments = []
        for comment in comments:
            time.sleep(1)  # for avoiding secondary rate limit
            is_verified, e = self._verify_code_comment(comment)
            if is_verified:
                verified_comments.append(comment)
            else:
                invalid_comments.append((comment, e))
        return verified_comments, invalid_comments

    def _try_fix_invalid_inline_comments(self, invalid_comments: list[dict]) -> list[dict]:
        """
        Try fixing invalid comments by removing the suggestion part and setting the comment just on the first line.
        Return only comments that have been modified in some way.
        This is a best-effort attempt to fix invalid comments, and should be verified accordingly.
        """
        import copy
        fixed_comments = []
        for comment in invalid_comments:
            try:
                fixed_comment = copy.deepcopy(comment)  # avoid modifying the original comment dict for later logging
                if "```suggestion" in comment["body"]:
                    fixed_comment["body"] = comment["body"].split("```suggestion")[0]
                if "start_line" in comment:
                    fixed_comment["line"] = comment["start_line"]
                    del fixed_comment["start_line"]
                if "start_side" in comment:
                    fixed_comment["side"] = comment["start_side"]
                    del fixed_comment["start_side"]
                if fixed_comment != comment:
                    fixed_comments.append(fixed_comment)
            except Exception as e:
                if get_settings().config.verbosity_level >= 2:
                    get_logger().error(f"Failed to fix inline comment, error: {e}")
        return fixed_comments

    def publish_code_suggestions(self, code_suggestions: list) -> bool:
        """
        Publishes code suggestions as comments on the PR.
        """
        post_parameters_list = []
        for suggestion in code_suggestions:
            body = suggestion['body']
            relevant_file = suggestion['relevant_file']
            relevant_lines_start = suggestion['relevant_lines_start']
            relevant_lines_end = suggestion['relevant_lines_end']

            if not relevant_lines_start or relevant_lines_start == -1:
                if get_settings().config.verbosity_level >= 2:
                    get_logger().exception(
                        f"Failed to publish code suggestion, relevant_lines_start is {relevant_lines_start}")
                continue

            if relevant_lines_end < relevant_lines_start:
                if get_settings().config.verbosity_level >= 2:
                    get_logger().exception(f"Failed to publish code suggestion, "
                                      f"relevant_lines_end is {relevant_lines_end} and "
                                      f"relevant_lines_start is {relevant_lines_start}")
                continue

            if relevant_lines_end > relevant_lines_start:
                post_parameters = {
                    "body": body,
                    "path": relevant_file,
                    "line": relevant_lines_end,
                    "start_line": relevant_lines_start,
                    "start_side": "RIGHT",
                }
            else:  # API is different for single line comments
                post_parameters = {
                    "body": body,
                    "path": relevant_file,
                    "line": relevant_lines_start,
                    "side": "RIGHT",
                }
            post_parameters_list.append(post_parameters)

        try:
            self.publish_inline_comments(post_parameters_list)
            return True
        except Exception as e:
            if get_settings().config.verbosity_level >= 2:
                get_logger().error(f"Failed to publish code suggestion, error: {e}")
            return False

    def edit_comment(self, comment, body: str):
        body = self.limit_output_characters(body, self.max_comment_chars)
        comment.edit(body=body)

    def edit_comment_from_comment_id(self, comment_id: int, body: str):
        try:
            # self.pr.get_issue_comment(comment_id).edit(body)
            body = self.limit_output_characters(body, self.max_comment_chars)
            headers, data_patch = self.pr._requester.requestJsonAndCheck(
                "PATCH", f"{self.base_url}/repos/{self.repo}/issues/comments/{comment_id}",
                input={"body": body}
            )
        except Exception as e:
            get_logger().exception(f"Failed to edit comment, error: {e}")

    def reply_to_comment_from_comment_id(self, comment_id: int, body: str):
        try:
            # self.pr.get_issue_comment(comment_id).edit(body)
            body = self.limit_output_characters(body, self.max_comment_chars)
            headers, data_patch = self.pr._requester.requestJsonAndCheck(
                "POST", f"{self.base_url}/repos/{self.repo}/pulls/{self.pr_num}/comments/{comment_id}/replies",
                input={"body": body}
            )
        except Exception as e:
            get_logger().exception(f"Failed to reply comment, error: {e}")

    def get_comment_body_from_comment_id(self, comment_id: int):
        try:
            # self.pr.get_issue_comment(comment_id).edit(body)
            headers, data_patch = self.pr._requester.requestJsonAndCheck(
                "GET", f"{self.base_url}/repos/{self.repo}/issues/comments/{comment_id}"
            )
            return data_patch.get("body","")
        except Exception as e:
            get_logger().exception(f"Failed to edit comment, error: {e}")
            return None

    def publish_file_comments(self, file_comments: list) -> bool:
        try:
            headers, existing_comments = self.pr._requester.requestJsonAndCheck(
                "GET", f"{self.pr.url}/comments"
            )
            for comment in file_comments:
                comment['commit_id'] = self.last_commit_id.sha
                comment['body'] = self.limit_output_characters(comment['body'], self.max_comment_chars)

                found = False
                for existing_comment in existing_comments:
                    comment['commit_id'] = self.last_commit_id.sha
                    our_app_name = get_settings().get("GITHUB.APP_NAME", "")
                    same_comment_creator = False
                    if self.deployment_type == 'app':
                        same_comment_creator = our_app_name.lower() in existing_comment['user']['login'].lower()
                    elif self.deployment_type == 'user':
                        same_comment_creator = self.github_user_id == existing_comment['user']['login']
                    if existing_comment['subject_type'] == 'file' and comment['path'] == existing_comment['path'] and same_comment_creator:
                        headers, data_patch = self.pr._requester.requestJsonAndCheck(
                            "PATCH", f"{self.base_url}/repos/{self.repo}/pulls/comments/{existing_comment['id']}", input={"body":comment['body']}
                        )
                        found = True
                        break
                if not found:
                    headers, data_post = self.pr._requester.requestJsonAndCheck(
                        "POST", f"{self.pr.url}/comments", input=comment
                    )
            return True
        except Exception as e:
            if get_settings().config.verbosity_level >= 2:
                get_logger().error(f"Failed to publish diffview file summary, error: {e}")
            return False

    def remove_initial_comment(self):
        try:
            for comment in getattr(self.pr, 'comments_list', []):
                if comment.is_temporary:
                    self.remove_comment(comment)
        except Exception as e:
            get_logger().exception(f"Failed to remove initial comment, error: {e}")

    def remove_comment(self, comment):
        try:
            comment.delete()
        except Exception as e:
            get_logger().exception(f"Failed to remove comment, error: {e}")

    def get_title(self):
        return self.pr.title

    def get_languages(self):
        languages = self._get_repo().get_languages()
        return languages

    def get_pr_branch(self):
        return self.pr.head.ref

    def get_pr_owner_id(self) -> str | None:
        if not self.repo:
            return None
        return self.repo.split('/')[0]

    def get_pr_description_full(self):
        return self.pr.body

    def get_user_id(self):
        if not self.github_user_id:
            try:
                self.github_user_id = self.github_client.get_user().raw_data['login']
            except Exception as e:
                self.github_user_id = ""
                # logging.exception(f"Failed to get user id, error: {e}")
        return self.github_user_id

    def get_notifications(self, since: datetime):
        deployment_type = get_settings().get("GITHUB.DEPLOYMENT_TYPE", "user")

        if deployment_type != 'user':
            raise ValueError("Deployment mode must be set to 'user' to get notifications")

        notifications = self.github_client.get_user().get_notifications(since=since)
        return notifications

    def get_issue_comments(self):
        return self.pr.get_issue_comments()

    def get_repo_settings(self):
        try:
            # contents = self.repo_obj.get_contents(".pr_agent.toml", ref=self.pr.head.sha).decoded_content

            # more logical to take 'pr_agent.toml' from the default branch
            contents = self.repo_obj.get_contents(".pr_agent.toml").decoded_content
            return contents
        except Exception:
            return ""

    def get_workspace_name(self):
        return self.repo.split('/')[0]

    def add_eyes_reaction(self, issue_comment_id: int, disable_eyes: bool = False) -> Optional[int]:
        if disable_eyes:
            return None
        try:
            headers, data_patch = self.pr._requester.requestJsonAndCheck(
                "POST", f"{self.base_url}/repos/{self.repo}/issues/comments/{issue_comment_id}/reactions",
                input={"content": "eyes"}
            )
            return data_patch.get("id", None)
        except Exception as e:
            get_logger().warning(f"Failed to add eyes reaction, error: {e}")
            return None

    def remove_reaction(self, issue_comment_id: int, reaction_id: str) -> bool:
        try:
            # self.pr.get_issue_comment(issue_comment_id).delete_reaction(reaction_id)
            headers, data_patch = self.pr._requester.requestJsonAndCheck(
                "DELETE",
                f"{self.base_url}/repos/{self.repo}/issues/comments/{issue_comment_id}/reactions/{reaction_id}"
            )
            return True
        except Exception as e:
            get_logger().exception(f"Failed to remove eyes reaction, error: {e}")
            return False

    def _parse_pr_url(self, pr_url: str) -> Tuple[str, int]:
        parsed_url = urlparse(pr_url)

        if parsed_url.path.startswith('/api/v3'):
            parsed_url = urlparse(pr_url.replace("/api/v3", ""))

        path_parts = parsed_url.path.strip('/').split('/')
        if 'api.github.com' in parsed_url.netloc or '/api/v3' in pr_url:
            if len(path_parts) < 5 or path_parts[3] != 'pulls':
                raise ValueError("The provided URL does not appear to be a GitHub PR URL")
            repo_name = '/'.join(path_parts[1:3])
            try:
                pr_number = int(path_parts[4])
            except ValueError as e:
                raise ValueError("Unable to convert PR number to integer") from e
            return repo_name, pr_number

        if len(path_parts) < 4 or path_parts[2] != 'pull':
            raise ValueError("The provided URL does not appear to be a GitHub PR URL")

        repo_name = '/'.join(path_parts[:2])
        try:
            pr_number = int(path_parts[3])
        except ValueError as e:
            raise ValueError("Unable to convert PR number to integer") from e

        return repo_name, pr_number

    def _parse_issue_url(self, issue_url: str) -> Tuple[str, int]:
        parsed_url = urlparse(issue_url)

        if 'github.com' not in parsed_url.netloc:
            raise ValueError("The provided URL is not a valid GitHub URL")

        path_parts = parsed_url.path.strip('/').split('/')
        if 'api.github.com' in parsed_url.netloc:
            if len(path_parts) < 5 or path_parts[3] != 'issues':
                raise ValueError("The provided URL does not appear to be a GitHub ISSUE URL")
            repo_name = '/'.join(path_parts[1:3])
            try:
                issue_number = int(path_parts[4])
            except ValueError as e:
                raise ValueError("Unable to convert issue number to integer") from e
            return repo_name, issue_number

        if len(path_parts) < 4 or path_parts[2] != 'issues':
            raise ValueError("The provided URL does not appear to be a GitHub PR issue")

        repo_name = '/'.join(path_parts[:2])
        try:
            issue_number = int(path_parts[3])
        except ValueError as e:
            raise ValueError("Unable to convert issue number to integer") from e

        return repo_name, issue_number

    def _get_github_client(self):
        deployment_type = get_settings().get("GITHUB.DEPLOYMENT_TYPE", "user")

        if deployment_type == 'app':
            try:
                private_key = get_settings().github.private_key
                app_id = get_settings().github.app_id
            except AttributeError as e:
                raise ValueError("GitHub app ID and private key are required when using GitHub app deployment") from e
            if not self.installation_id:
                raise ValueError("GitHub app installation ID is required when using GitHub app deployment")
            auth = AppAuthentication(app_id=app_id, private_key=private_key,
                                     installation_id=self.installation_id)
            return Github(app_auth=auth, base_url=self.base_url)

        if deployment_type == 'user':
            try:
                token = get_settings().github.user_token
            except AttributeError as e:
                raise ValueError(
                    "GitHub token is required when using user deployment. See: "
                    "https://github.com/Codium-ai/pr-agent#method-2-run-from-source") from e
            return Github(auth=Auth.Token(token), base_url=self.base_url)

    def _get_repo(self):
        if hasattr(self, 'repo_obj') and \
                hasattr(self.repo_obj, 'full_name') and \
                self.repo_obj.full_name == self.repo:
            return self.repo_obj
        else:
            self.repo_obj = self.github_client.get_repo(self.repo)
            return self.repo_obj


    def _get_pr(self):
        return self._get_repo().get_pull(self.pr_num)

    def get_pr_file_content(self, file_path: str, branch: str) -> str:
        try:
            file_content_str = str(
                self._get_repo()
                .get_contents(file_path, ref=branch)
                .decoded_content.decode()
            )
        except Exception:
            file_content_str = ""
        return file_content_str

    def create_or_update_pr_file(
        self, file_path: str, branch: str, contents="", message=""
    ) -> None:
        try:
            file_obj = self._get_repo().get_contents(file_path, ref=branch)
            sha1=file_obj.sha
        except Exception:
            sha1=""
        self.repo_obj.update_file(
            path=file_path,
            message=message,
            content=contents,
            sha=sha1,
            branch=branch,
        )

    def _get_pr_file_content(self, file: FilePatchInfo, sha: str) -> str:
        return self.get_pr_file_content(file.filename, sha)

    def publish_labels(self, pr_types):
        try:
            label_color_map = {"Bug fix": "1d76db", "Tests": "e99695", "Bug fix with tests": "c5def5",
                               "Enhancement": "bfd4f2", "Documentation": "d4c5f9",
                               "Other": "d1bcf9"}
            post_parameters = []
            for p in pr_types:
                color = label_color_map.get(p, "d1bcf9")  # default to "Other" color
                post_parameters.append({"name": p, "color": color})
            headers, data = self.pr._requester.requestJsonAndCheck(
                "PUT", f"{self.pr.issue_url}/labels", input=post_parameters
            )
        except Exception as e:
            get_logger().warning(f"Failed to publish labels, error: {e}")

    def get_pr_labels(self, update=False):
        try:
            if not update:
                labels =self.pr.labels
                return [label.name for label in labels]
            else: # obtain the latest labels. Maybe they changed while the AI was running
                headers, labels = self.pr._requester.requestJsonAndCheck(
                    "GET", f"{self.pr.issue_url}/labels")
                return [label['name'] for label in labels]

        except Exception as e:
            get_logger().exception(f"Failed to get labels, error: {e}")
            return []

    def get_repo_labels(self):
        labels = self.repo_obj.get_labels()
        return [label for label in itertools.islice(labels, 50)]

    def get_commit_messages(self):
        """
        Retrieves the commit messages of a pull request.

        Returns:
            str: A string containing the commit messages of the pull request.
        """
        max_tokens = get_settings().get("CONFIG.MAX_COMMITS_TOKENS", None)
        try:
            commit_list = self.pr.get_commits()
            commit_messages = [commit.commit.message for commit in commit_list]
            commit_messages_str = "\n".join([f"{i + 1}. {message}" for i, message in enumerate(commit_messages)])
        except Exception:
            commit_messages_str = ""
        if max_tokens:
            commit_messages_str = clip_tokens(commit_messages_str, max_tokens)
        return commit_messages_str

    def generate_link_to_relevant_line_number(self, suggestion) -> str:
        try:
            relevant_file = suggestion['relevant_file'].strip('`').strip("'").strip('\n')
            relevant_line_str = suggestion['relevant_line'].strip('\n')
            if not relevant_line_str:
                return ""

            position, absolute_position = find_line_number_of_relevant_line_in_file \
                (self.diff_files, relevant_file, relevant_line_str)

            if absolute_position != -1:
                # # link to right file only
                # link = f"https://github.com/{self.repo}/blob/{self.pr.head.sha}/{relevant_file}" \
                #        + "#" + f"L{absolute_position}"

                # link to diff
                sha_file = hashlib.sha256(relevant_file.encode('utf-8')).hexdigest()
                link = f"{self.base_url_html}/{self.repo}/pull/{self.pr_num}/files#diff-{sha_file}R{absolute_position}"
                return link
        except Exception as e:
            if get_settings().config.verbosity_level >= 2:
                get_logger().info(f"Failed adding line link, error: {e}")

        return ""

    def get_line_link(self, relevant_file: str, relevant_line_start: int, relevant_line_end: int = None) -> str:
        sha_file = hashlib.sha256(relevant_file.encode('utf-8')).hexdigest()
        if relevant_line_start == -1:
            link = f"{self.base_url_html}/{self.repo}/pull/{self.pr_num}/files#diff-{sha_file}"
        elif relevant_line_end:
            link = f"{self.base_url_html}/{self.repo}/pull/{self.pr_num}/files#diff-{sha_file}R{relevant_line_start}-R{relevant_line_end}"
        else:
            link = f"{self.base_url_html}/{self.repo}/pull/{self.pr_num}/files#diff-{sha_file}R{relevant_line_start}"
        return link

    def get_lines_link_original_file(self, filepath: str, component_range: Range) -> str:
        """
        Returns the link to the original file on GitHub that corresponds to the given filepath and component range.

        Args:
            filepath (str): The path of the file.
            component_range (Range): The range of lines that represent the component.

        Returns:
            str: The link to the original file on GitHub.

        Example:
            >>> filepath = "path/to/file.py"
            >>> component_range = Range(line_start=10, line_end=20)
            >>> link = get_lines_link_original_file(filepath, component_range)
            >>> print(link)
            "https://github.com/{repo}/blob/{commit_sha}/{filepath}/#L11-L21"
        """
        line_start = component_range.line_start + 1
        line_end = component_range.line_end + 1
        # link = (f"https://github.com/{self.repo}/blob/{self.last_commit_id.sha}/{filepath}/"
        #         f"#L{line_start}-L{line_end}")
        link = (f"{self.base_url_html}/{self.repo}/blob/{self.last_commit_id.sha}/{filepath}/"
                f"#L{line_start}-L{line_end}")

        return link

    def get_pr_id(self):
        try:
            pr_id = f"{self.repo}/{self.pr_num}"
            return pr_id
        except:
            return ""

    def auto_approve(self) -> bool:
        try:
            res = self.pr.create_review(event="APPROVE")
            if res.state == "APPROVED":
                return True
            return False
        except Exception as e:
            get_logger().exception(f"Failed to auto-approve, error: {e}")
            return False

    def calc_pr_statistics(self, pull_request_data: dict):
            return {}