# vim:fenc=utf-8
from typing import Any, Dict, Optional

from django.http import HttpRequest, HttpResponse
from typing_extensions import Protocol

from zerver.decorator import webhook_view
from zerver.lib.exceptions import UnsupportedWebhookEventType
from zerver.lib.request import REQ, has_request_variables
from zerver.lib.response import json_success
from zerver.lib.webhooks.common import (
    check_send_webhook_message,
    get_http_headers_from_filename,
    validate_extract_webhook_http_header,
)
from zerver.lib.webhooks.git import (
    TOPIC_WITH_BRANCH_TEMPLATE,
    TOPIC_WITH_PR_OR_ISSUE_INFO_TEMPLATE,
    TOPIC_WITH_RELEASE_TEMPLATE,
    get_create_branch_event_message,
    get_issue_event_message,
    get_pull_request_event_message,
    get_push_commits_event_message,
    get_release_event_message,
)
from zerver.models import UserProfile

fixture_to_headers = get_http_headers_from_filename("HTTP_X_GOGS_EVENT")


def get_issue_url(repo_url: str, issue_nr: int) -> str:
    return f"{repo_url}/issues/{issue_nr}"


def format_push_event(payload: Dict[str, Any]) -> str:

    for commit in payload["commits"]:
        commit["sha"] = commit["id"]
        commit["name"] = commit["author"]["username"] or commit["author"]["name"].split()[0]

    data = {
        "user_name": payload["sender"]["username"],
        "compare_url": payload["compare_url"],
        "branch_name": payload["ref"].replace("refs/heads/", ""),
        "commits_data": payload["commits"],
    }

    return get_push_commits_event_message(**data)


def format_new_branch_event(payload: Dict[str, Any]) -> str:

    branch_name = payload["ref"]
    url = "{}/src/{}".format(payload["repository"]["html_url"], branch_name)

    data = {
        "user_name": payload["sender"]["username"],
        "url": url,
        "branch_name": branch_name,
    }
    return get_create_branch_event_message(**data)


def format_pull_request_event(payload: Dict[str, Any], include_title: bool = False) -> str:

    data = {
        "user_name": payload["pull_request"]["user"]["username"],
        "action": payload["action"],
        "url": payload["pull_request"]["html_url"],
        "number": payload["pull_request"]["number"],
        "target_branch": payload["pull_request"]["head_branch"],
        "base_branch": payload["pull_request"]["base_branch"],
        "title": payload["pull_request"]["title"] if include_title else None,
    }

    if payload["pull_request"]["merged"]:
        data["user_name"] = payload["pull_request"]["merged_by"]["username"]
        data["action"] = "merged"

    return get_pull_request_event_message(**data)


def format_issues_event(payload: Dict[str, Any], include_title: bool = False) -> str:
    issue_nr = payload["issue"]["number"]
    assignee = payload["issue"]["assignee"]
    return get_issue_event_message(
        payload["sender"]["login"],
        payload["action"],
        get_issue_url(payload["repository"]["html_url"], issue_nr),
        issue_nr,
        payload["issue"]["body"],
        assignee=assignee["login"] if assignee else None,
        title=payload["issue"]["title"] if include_title else None,
    )


def format_issue_comment_event(payload: Dict[str, Any], include_title: bool = False) -> str:
    action = payload["action"]
    comment = payload["comment"]
    issue = payload["issue"]

    if action == "created":
        action = "[commented]"
    else:
        action = f"{action} a [comment]"
    action += "({}) on".format(comment["html_url"])

    return get_issue_event_message(
        payload["sender"]["login"],
        action,
        get_issue_url(payload["repository"]["html_url"], issue["number"]),
        issue["number"],
        comment["body"],
        title=issue["title"] if include_title else None,
    )


def format_release_event(payload: Dict[str, Any], include_title: bool = False) -> str:
    data = {
        "user_name": payload["release"]["author"]["username"],
        "action": payload["action"],
        "tagname": payload["release"]["tag_name"],
        "release_name": payload["release"]["name"],
        "url": payload["repository"]["html_url"],
    }

    return get_release_event_message(**data)


@webhook_view("Gogs")
@has_request_variables
def api_gogs_webhook(
    request: HttpRequest,
    user_profile: UserProfile,
    payload: Dict[str, Any] = REQ(argument_type="body"),
    branches: Optional[str] = REQ(default=None),
    user_specified_topic: Optional[str] = REQ("topic", default=None),
) -> HttpResponse:
    return gogs_webhook_main(
        "Gogs",
        "X_GOGS_EVENT",
        format_pull_request_event,
        request,
        user_profile,
        payload,
        branches,
        user_specified_topic,
    )


class FormatPullRequestEvent(Protocol):
    def __call__(self, payload: Dict[str, Any], include_title: bool) -> str:
        ...


def gogs_webhook_main(
    integration_name: str,
    http_header_name: str,
    format_pull_request_event: FormatPullRequestEvent,
    request: HttpRequest,
    user_profile: UserProfile,
    payload: Dict[str, Any],
    branches: Optional[str],
    user_specified_topic: Optional[str],
) -> HttpResponse:
    repo = payload["repository"]["name"]
    event = validate_extract_webhook_http_header(request, http_header_name, integration_name)
    if event == "push":
        branch = payload["ref"].replace("refs/heads/", "")
        if branches is not None and branch not in branches.split(","):
            return json_success()
        body = format_push_event(payload)
        topic = TOPIC_WITH_BRANCH_TEMPLATE.format(
            repo=repo,
            branch=branch,
        )
    elif event == "create":
        body = format_new_branch_event(payload)
        topic = TOPIC_WITH_BRANCH_TEMPLATE.format(
            repo=repo,
            branch=payload["ref"],
        )
    elif event == "pull_request":
        body = format_pull_request_event(
            payload,
            include_title=user_specified_topic is not None,
        )
        topic = TOPIC_WITH_PR_OR_ISSUE_INFO_TEMPLATE.format(
            repo=repo,
            type="PR",
            id=payload["pull_request"]["id"],
            title=payload["pull_request"]["title"],
        )
    elif event == "issues":
        body = format_issues_event(
            payload,
            include_title=user_specified_topic is not None,
        )
        topic = TOPIC_WITH_PR_OR_ISSUE_INFO_TEMPLATE.format(
            repo=repo,
            type="issue",
            id=payload["issue"]["number"],
            title=payload["issue"]["title"],
        )
    elif event == "issue_comment":
        body = format_issue_comment_event(
            payload,
            include_title=user_specified_topic is not None,
        )
        topic = TOPIC_WITH_PR_OR_ISSUE_INFO_TEMPLATE.format(
            repo=repo,
            type="issue",
            id=payload["issue"]["number"],
            title=payload["issue"]["title"],
        )
    elif event == "release":
        body = format_release_event(
            payload,
            include_title=user_specified_topic is not None,
        )
        topic = TOPIC_WITH_RELEASE_TEMPLATE.format(
            repo=repo,
            tag=payload["release"]["tag_name"],
            title=payload["release"]["name"],
        )

    else:
        raise UnsupportedWebhookEventType(event)

    check_send_webhook_message(request, user_profile, topic, body)
    return json_success()