import json
from typing import Annotated, Optional

import httpx
from arcade.sdk import ToolContext, tool
from arcade.sdk.auth import GitHub
from arcade.sdk.errors import RetryableToolError

from arcade_github.tools.models import (
    DiffSide,
    PRSortProperty,
    PRState,
    ReviewCommentSortProperty,
    ReviewCommentSubjectType,
    SortDirection,
)
from arcade_github.tools.utils import (
    get_github_diff_headers,
    get_github_json_headers,
    get_url,
    handle_github_response,
    remove_none_values,
)


# Implements https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#list-pull-requests
# Example `arcade chat` usage:
#   "get all open PRs that <USER> has that are in the <OWNER>/<REPO> repo"
# TODO: Validate owner/repo combination is valid for the authenticated user.
#       If not, return RetryableToolError with available repos.
# TODO: list repo's branches and validate base is in the list (or default to main).
#       If not, return RetryableToolError with available branches.
@tool(requires_auth=GitHub())
async def list_pull_requests(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    state: Annotated[Optional[PRState], "The state of the pull requests to return."] = PRState.OPEN,
    head: Annotated[
        Optional[str],
        "Filter pulls by head user or head organization and branch name in the format of "
        "user:ref-name or organization:ref-name.",
    ] = None,
    base: Annotated[Optional[str], "Filter pulls by base branch name."] = "main",
    sort: Annotated[
        Optional[PRSortProperty], "The property to sort the results by."
    ] = PRSortProperty.CREATED,
    direction: Annotated[Optional[SortDirection], "The direction of the sort."] = None,
    per_page: Annotated[int, "The number of results per page (max 100)."] = 30,
    page: Annotated[int, "The page number of the results to fetch."] = 1,
    include_extra_data: Annotated[
        bool,
        "If true, return all the data available about the pull requests. "
        "This is a large payload and may impact performance - use with caution.",
    ] = False,
) -> Annotated[str, "JSON string containing a list of pull requests with their details"]:
    """
    List pull requests in a GitHub repository.

    Example:
    ```
    list_pull_requests(owner="octocat", repo="Hello-World", state=PRState.OPEN, sort=PRSort.UPDATED)
    ```
    """
    url = get_url("repo_pulls", owner=owner, repo=repo)
    params = {
        "base": base,
        "state": state.value if state else None,
        "sort": sort.value if sort else None,
        "per_page": min(max(1, per_page), 100),  # clamp per_page to 1-100
        "page": page,
        "head": head,
        "direction": direction,  # defaults to desc when sort is 'created'/'not specified', else asc
    }
    params = remove_none_values(params)
    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers=headers, params=params)

    handle_github_response(response, url)

    pull_requests = response.json()
    results = []
    for pr in pull_requests:
        if include_extra_data:
            results.append(pr)
            continue
        results.append({
            "number": pr.get("number"),
            "title": pr.get("title"),
            "body": pr.get("body"),
            "state": pr.get("state"),
            "html_url": pr.get("html_url"),
            "diff_url": pr.get("diff_url"),
            "created_at": pr.get("created_at"),
            "updated_at": pr.get("updated_at"),
            "user": pr.get("user", {}).get("login"),
            "base": pr.get("base", {}).get("ref"),
            "head": pr.get("head", {}).get("ref"),
        })
    return json.dumps({"pull_requests": results})


# Implements https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#get-a-pull-request
# Example `arcade chat` usage:
#   "get the PR #72 in the <OWNER>/<REPO> repo. Include diff content in your response."
@tool(requires_auth=GitHub())
async def get_pull_request(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    include_diff_content: Annotated[
        Optional[bool],
        "If true, return the diff content of the pull request.",
    ] = False,
    include_extra_data: Annotated[
        Optional[bool],
        "If true, return all the data available about the pull requests. "
        "This is a large payload and may impact performance - use with caution.",
    ] = False,
) -> Annotated[
    str,
    "JSON string containing details of the specified pull request, "
    "optionally including diff content",
]:
    """
    Get details of a pull request in a GitHub repository.

    Example:
    ```
    get_pull_request(owner="octocat", repo="Hello-World", pull_number=1347)
    ```
    """
    url = get_url("repo_pull", owner=owner, repo=repo, pull_number=pull_number)
    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )
    diff_headers = get_github_diff_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers=headers)
        if include_diff_content:
            diff_response = await client.get(url, headers=diff_headers)

    handle_github_response(response, url)

    if include_diff_content:
        handle_github_response(diff_response, url)

    pr_data = response.json()

    if include_extra_data:
        result = pr_data
        if include_diff_content:
            result["diff_content"] = diff_response.content.decode("utf-8")
        return json.dumps(result)

    important_info = {
        "number": pr_data.get("number"),
        "title": pr_data.get("title"),
        "body": pr_data.get("body"),
        "state": pr_data.get("state"),
        "html_url": pr_data.get("html_url"),
        "diff_url": pr_data.get("diff_url"),
        "created_at": pr_data.get("created_at"),
        "updated_at": pr_data.get("updated_at"),
        "user": pr_data.get("user", {}).get("login"),
        "base": pr_data.get("base", {}).get("ref"),
        "head": pr_data.get("head", {}).get("ref"),
    }

    if include_diff_content:
        important_info["diff_content"] = diff_response.content.decode("utf-8")

    return json.dumps(important_info)


# Implements https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#update-a-pull-request
# Example `arcade chat` usage:
#   "update PR #72 in the <OWNER>/<REPO> repo by changing the title to 'New Title' and
#   setting the body to 'This PR description was added via arcade chat!'."
# TODO: Enable this tool to append to the PR contents instead of only replacing content.
@tool(requires_auth=GitHub())
async def update_pull_request(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    title: Annotated[Optional[str], "The title of the pull request."] = None,
    body: Annotated[Optional[str], "The contents of the pull request."] = None,
    state: Annotated[
        Optional[PRState], "State of this Pull Request. Either open or closed."
    ] = None,
    base: Annotated[
        Optional[str], "The name of the branch you want your changes pulled into."
    ] = None,
    maintainer_can_modify: Annotated[
        Optional[bool], "Indicates whether maintainers can modify the pull request."
    ] = None,
) -> Annotated[str, "JSON string containing updated information about the pull request"]:
    """
    Update a pull request in a GitHub repository.

    Example:
    ```
    update_pull_request(
        owner="octocat",
        repo="Hello-World",
        pull_number=1347,
        title="new title",
        body="updated body",
    )
    ```
    """
    url = get_url("repo_pull", owner=owner, repo=repo, pull_number=pull_number)

    data = {
        "title": title,
        "body": body,
        "state": state.value if state else None,
        "base": base,
        "maintainer_can_modify": maintainer_can_modify,
    }
    data = remove_none_values(data)

    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.patch(url, headers=headers, json=data)

    handle_github_response(response, url)

    pr_data = response.json()
    important_info = {
        "url": pr_data.get("url"),
        "id": pr_data.get("id"),
        "html_url": pr_data.get("html_url"),
        "number": pr_data.get("number"),
        "state": pr_data.get("state"),
        "title": pr_data.get("title"),
        "user": pr_data.get("user", {}).get("login"),
        "body": pr_data.get("body"),
        "created_at": pr_data.get("created_at"),
        "updated_at": pr_data.get("updated_at"),
    }
    return json.dumps(important_info)


# Implements https://docs.github.com/en/rest/pulls/commits?apiVersion=2022-11-28#list-commits-on-a-pull-request
# Example `arcade chat` usage: "list all of the commits for the PR 72 in the <OWNER>/<REPO> repo"
@tool(requires_auth=GitHub())
async def list_pull_request_commits(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    per_page: Annotated[int, "The number of results per page (max 100)."] = 30,
    page: Annotated[int, "The page number of the results to fetch."] = 1,
    include_extra_data: Annotated[
        bool,
        "If true, return all the data available about the pull requests. "
        "This is a large payload and may impact performance - use with caution.",
    ] = False,
) -> Annotated[str, "JSON string containing a list of commits for the specified pull request"]:
    """
    List commits (from oldest to newest) on a pull request in a GitHub repository.

    Example:
    ```
    list_pull_request_commits(owner="octocat", repo="Hello-World", pull_number=1347)
    ```
    """
    url = get_url("repo_pull_commits", owner=owner, repo=repo, pull_number=pull_number)

    params = {
        "per_page": max(1, min(100, per_page)),  # clamp per_page to 1-100
        "page": page,
    }

    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers=headers, params=params)

    handle_github_response(response, url)

    commits = response.json()
    if include_extra_data:
        return json.dumps({"commits": commits})

    filtered_commits = []
    for commit in commits:
        filtered_commit = {
            "sha": commit.get("sha"),
            "html_url": commit.get("html_url"),
            "diff_url": commit.get("html_url") + ".diff" if commit.get("html_url") else None,
            "commit": {
                "message": commit.get("commit", {}).get("message"),
                "author": commit.get("commit", {}).get("author", {}).get("name"),
                "committer": commit.get("commit", {}).get("committer", {}).get("name"),
                "date": commit.get("commit", {}).get("committer", {}).get("date"),
            },
            "author": commit.get("author", {}).get("login"),
            "committer": commit.get("committer", {}).get("login"),
        }
        filtered_commits.append(filtered_commit)

    return json.dumps({"commits": filtered_commits})


# Implements https://docs.github.com/en/rest/pulls/comments?apiVersion=2022-11-28#create-a-reply-for-a-review-comment
# Example `arcade chat` usage:
#   "create a reply to the review comment 1778019974 in arcadeai/arcade-ai for
#   the PR 72 that says 'Thanks for the suggestion.'"
# Note: This tool requires the ID of the review comment to reply to. To obtain this ID,
#       you should first call the `list_review_comments_on_pull_request` function.
#       The returned JSON will contain the `id` field for each comment, which can be used as the
#       `comment_id` parameter in this function.
@tool(requires_auth=GitHub())
async def create_reply_for_review_comment(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    comment_id: Annotated[int, "The unique identifier of the comment."],
    body: Annotated[str, "The text of the review comment."],
) -> Annotated[str, "JSON string containing details of the created reply comment"]:
    """
    Create a reply to a review comment for a pull request.

    Example:
    ```
    create_reply_for_review_comment(
        owner="octocat",
        repo="Hello-World",
        pull_number=1347,
        comment_id=42,
        body="Looks good to me!",
    )
    ```
    """
    url = get_url(
        "repo_pull_comment_replies",
        owner=owner,
        repo=repo,
        pull_number=pull_number,
        comment_id=comment_id,
    )

    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    data = {"body": body}

    async with httpx.AsyncClient() as client:
        response = await client.post(url, headers=headers, json=data)

    handle_github_response(response, url)

    return json.dumps(response.json())


# Implements https://docs.github.com/en/rest/pulls/comments?apiVersion=2022-11-28#list-review-comments-on-a-pull-request
# Example `arcade chat` usage: "list all of the review comments for PR 72 in <OWNER>/<REPO>"
@tool(requires_auth=GitHub())
async def list_review_comments_on_pull_request(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    sort: Annotated[
        Optional[ReviewCommentSortProperty],
        "The property to sort the results by. Can be one of: created, updated.",
    ] = ReviewCommentSortProperty.CREATED,
    direction: Annotated[
        Optional[SortDirection], "The direction to sort results. Can be one of: asc, desc."
    ] = SortDirection.DESC,
    since: Annotated[
        Optional[str],
        "Only show results that were last updated after the given time. "
        "This is a timestamp in ISO 8601 format: YYYY-MM-DDTHH:MM:SSZ.",
    ] = None,
    per_page: Annotated[int, "The number of results per page (max 100)."] = 30,
    page: Annotated[int, "The page number of the results to fetch."] = 1,
    include_extra_data: Annotated[
        bool,
        "If true, return all the data available about the review comments. "
        "This is a large payload and may impact performance - use with caution.",
    ] = False,
) -> Annotated[
    str, "JSON string containing a list of review comments for the specified pull request"
]:
    """
    List review comments on a pull request in a GitHub repository.

    Example:
    ```
    list_review_comments_on_pull_request(owner="octocat", repo="Hello-World", pull_number=1347)
    ```
    """
    url = get_url("repo_pull_comments", owner=owner, repo=repo, pull_number=pull_number)

    params = {
        "sort": sort,
        "direction": direction,
        "per_page": max(1, min(100, per_page)),  # clamp per_page to 1-100
        "page": page,
        "since": since,
    }
    params = remove_none_values(params)

    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers=headers, params=params)

    handle_github_response(response, url)

    review_comments = response.json()
    if include_extra_data:
        return json.dumps(review_comments)

    filtered_comments = []
    for comment in review_comments:
        filtered_comment = {
            "id": comment.get("id"),
            "url": comment.get("url"),
            "diff_hunk": comment.get("diff_hunk"),
            "path": comment.get("path"),
            "position": comment.get("position"),
            "original_position": comment.get("original_position"),
            "commit_id": comment.get("commit_id"),
            "original_commit_id": comment.get("original_commit_id"),
            "in_reply_to_id": comment.get("in_reply_to_id"),
            "user": comment.get("user", {}).get("login"),
            "body": comment.get("body"),
            "created_at": comment.get("created_at"),
            "updated_at": comment.get("updated_at"),
            "html_url": comment.get("html_url"),
            "line": comment.get("line"),
            "side": comment.get("side"),
            "pull_request_url": comment.get("pull_request_url"),
        }
        filtered_comments.append(filtered_comment)
    return json.dumps({"review_comments": filtered_comments})


# Implements https://docs.github.com/en/rest/pulls/comments?apiVersion=2022-11-28#create-a-review-comment-for-a-pull-request
# Example `arcade chat` usage: "create a review comment for PR 72 in <OWNER>/<REPO> that says
#           'Great stuff! This looks good to merge. Add the comment to README.md file.'"
# TODO: Verify that path parameter exists in the PR's files that have changed
#       (Or should we allow for any file in the repo?).
#       If not, then throw RetryableToolError with all valid file paths.
@tool(requires_auth=GitHub())
async def create_review_comment(
    context: ToolContext,
    owner: Annotated[str, "The account owner of the repository. The name is not case sensitive."],
    repo: Annotated[
        str,
        "The name of the repository without the .git extension. The name is not case sensitive.",
    ],
    pull_number: Annotated[int, "The number that identifies the pull request."],
    body: Annotated[str, "The text of the review comment."],
    path: Annotated[str, "The relative path to the file that necessitates a comment."],
    commit_id: Annotated[
        Optional[str],
        "The SHA of the commit needing a comment. If not provided, the latest commit SHA of the "
        "PR's base branch will be used.",
    ] = None,
    start_line: Annotated[
        Optional[int],
        "The start line of the range of lines in the pull request diff that the "
        "comment applies to. Required unless 'subject_type' is 'file'.",
    ] = None,
    end_line: Annotated[
        Optional[int],
        "The end line of the range of lines in the pull request diff that the "
        "comment applies to. Required unless 'subject_type' is 'file'.",
    ] = None,
    side: Annotated[
        Optional[DiffSide],
        "The side of the diff that the pull request's changes appear on. "
        "Use LEFT for deletions that appear in red. Use RIGHT for additions that appear in green "
        "or unchanged lines that appear in white and are shown for context",
    ] = DiffSide.RIGHT,
    start_side: Annotated[
        Optional[str], "The starting side of the diff that the comment applies to."
    ] = None,
    subject_type: Annotated[
        Optional[ReviewCommentSubjectType],
        "The type of subject that the comment applies to. Can be one of: file, hunk, or line.",
    ] = ReviewCommentSubjectType.FILE,
    include_extra_data: Annotated[
        bool,
        "If true, return all the data available about the review comment. "
        "This is a large payload and may impact performance - use with caution.",
    ] = False,
) -> Annotated[str, "JSON string containing details of the created review comment"]:
    """
    Create a review comment for a pull request in a GitHub repository.

    If the subject_type is not 'file', then the start_line and end_line parameters are required.
    If the subject_type is 'file', then the start_line and end_line parameters are ignored.
    If the commit_id is not provided, the latest commit SHA of the PR's base branch will be used.

    Example:
    ```
    create_review_comment(
        owner="octocat",
        repo="Hello-World",
        pull_number=1347,
        body="Great stuff!",
        commit_id="6dcb09b5b57875f334f61aebed695e2e4193db5e",
        path="file1.txt",
        line=2,
        side="RIGHT"
    )
    ```
    """
    # If the subject_type is 'file', then the line_range parameter is ignored
    if subject_type == ReviewCommentSubjectType.FILE:
        start_line, end_line = None, None

    if (start_line is None or end_line is None) and subject_type != ReviewCommentSubjectType.FILE:
        message = (
            "'start_line' and 'end_line' parameters are required when 'subject_type' "
            "parameter is not 'file'. Either provide both a start_line and end_line or set "
            "subject_type to 'file'."
        )
        raise RetryableToolError(
            message=message,
            developer_message=message,
            additional_prompt_content=message,
        )

    # Ensure the line range goes from lowest to highest
    if start_line is not None and end_line is not None:
        start_line, end_line = (min(start_line, end_line), max(start_line, end_line))

    # Get the latest commit SHA of the PR's base branch and use that for the commit_id
    if not commit_id:
        commits_json = await list_pull_request_commits(context, owner, repo, pull_number)
        commits_data = json.loads(commits_json)
        commits = commits_data.get("commits", [])
        latest_commit = commits[-1] if commits else {}
        commit_id = latest_commit.get("sha")

    if not commit_id:
        message = (
            f"Failed to get the latest commit SHA of PR {pull_number} in repo {repo} owned by "
            "{owner}. Does the PR exist?"
        )
        raise RetryableToolError(
            message=message,
            developer_message=message,
            additional_prompt_content=message,
        )

    url = get_url("repo_pull_comments", owner=owner, repo=repo, pull_number=pull_number)
    data = {
        "body": body,
        "commit_id": commit_id,
        "path": path,
        "side": side,
        "line": end_line if end_line else None,
        "start_line": start_line
        if start_line and start_line != end_line
        else None,  # Only send start_line when using multi-line comments
        "start_side": start_side,
    }
    data = remove_none_values(data)
    headers = get_github_json_headers(
        context.authorization.token if context.authorization and context.authorization.token else ""
    )

    async with httpx.AsyncClient() as client:
        response = await client.post(url, headers=headers, json=data)

    handle_github_response(response, url)

    comment_data = response.json()
    if include_extra_data:
        return json.dumps(comment_data)

    important_info = {
        "id": comment_data.get("id"),
        "url": comment_data.get("url"),
        "body": comment_data.get("body"),
        "path": comment_data.get("path"),
        "line": comment_data.get("line"),
        "side": comment_data.get("side"),
        "commit_id": comment_data.get("commit_id"),
        "user": comment_data.get("user", {}).get("login"),
        "created_at": comment_data.get("created_at"),
        "updated_at": comment_data.get("updated_at"),
        "html_url": comment_data.get("html_url"),
    }
    return json.dumps(important_info)