# Webhooks for external integrations.
from typing import Any, Dict, Optional, Tuple
from urllib.parse import urlparse

from django.http import HttpRequest, HttpResponse

from zerver.decorator import webhook_view
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
from zerver.models import UserProfile

# Semaphore Classic Templates

BUILD_TEMPLATE = """
[Build {build_number}]({build_url}) {status}:
* **Commit**: [{commit_hash}: {commit_message}]({commit_url})
* **Author**: {email}
""".strip()

DEPLOY_TEMPLATE = """
[Deploy {deploy_number}]({deploy_url}) of [build {build_number}]({build_url}) {status}:
* **Commit**: [{commit_hash}: {commit_message}]({commit_url})
* **Author**: {email}
* **Server**: {server_name}
""".strip()

# Semaphore 2.0 Templates

# Currently, Semaphore 2.0 only supports GitHub, while Semaphore Classic
# supports Bitbucket too. The payload does not have URLs for commits, tags,
# pull requests, etc. So, we use separate templates for GitHub and construct
# the URLs ourselves. For any other repository hosting services we use
# templates that don't have any links in them.

GH_PUSH_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Commit**: [({commit_hash})]({commit_url}) {commit_message}
* **Branch**: {branch_name}
* **Author**: [{author_name}]({author_url})
""".strip()

PUSH_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Commit**: ({commit_hash}) {commit_message}
* **Branch**: {branch_name}
* **Author**: {author_name}
""".strip()

GH_PULL_REQUEST_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Pull Request**: [{pull_request_title}]({pull_request_url})
* **Branch**: {branch_name}
* **Author**: [{author_name}]({author_url})
""".strip()

PULL_REQUEST_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Pull Request**: {pull_request_title} (#{pull_request_number})
* **Branch**: {branch_name}
* **Author**: {author_name}
""".strip()

GH_TAG_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Tag**: [{tag_name}]({tag_url})
* **Author**: [{author_name}]({author_url})
""".strip()

TAG_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}**:
* **Tag**: {tag_name}
* **Author**: {author_name}
""".strip()

DEFAULT_TEMPLATE = """
[{pipeline_name}]({workflow_url}) pipeline **{pipeline_result}** for {event_name} event
""".strip()

TOPIC_TEMPLATE = "{project}/{branch}"

GITHUB_URL_TEMPLATES = {
    'commit': '{repo_url}/commit/{commit_id}',
    'pull_request': '{repo_url}/pull/{pr_number}',
    'tag': '{repo_url}/tree/{tag_name}',
    'user': 'https://github.com/{username}',
}


@webhook_view('Semaphore')
@has_request_variables
def api_semaphore_webhook(
    request: HttpRequest,
    user_profile: UserProfile,
    payload: Dict[str, Any] = REQ(argument_type='body'),
) -> HttpResponse:

    content, project_name, branch_name = (
        semaphore_classic(payload) if 'event' in payload else semaphore_2(payload)
    )
    subject = (
        TOPIC_TEMPLATE.format(project=project_name, branch=branch_name)
        if branch_name
        else project_name
    )
    check_send_webhook_message(request, user_profile, subject, content)
    return json_success()


def semaphore_classic(payload: Dict[str, Any]) -> Tuple[str, str, str]:
    # semaphore only gives the last commit, even if there were multiple commits
    # since the last build
    branch_name = payload["branch_name"]
    project_name = payload["project_name"]
    result = payload["result"]
    event = payload["event"]
    commit_id = payload["commit"]["id"]
    commit_url = payload["commit"]["url"]
    author_email = payload["commit"]["author_email"]
    message = summary_line(payload["commit"]["message"])

    if event == "build":
        build_url = payload["build_url"]
        build_number = payload["build_number"]
        content = BUILD_TEMPLATE.format(
            build_number=build_number,
            build_url=build_url,
            status=result,
            commit_hash=commit_id[:7],
            commit_message=message,
            commit_url=commit_url,
            email=author_email,
        )

    elif event == "deploy":
        build_url = payload["build_html_url"]
        build_number = payload["build_number"]
        deploy_url = payload["html_url"]
        deploy_number = payload["number"]
        server_name = payload["server_name"]
        content = DEPLOY_TEMPLATE.format(
            deploy_number=deploy_number,
            deploy_url=deploy_url,
            build_number=build_number,
            build_url=build_url,
            status=result,
            commit_hash=commit_id[:7],
            commit_message=message,
            commit_url=commit_url,
            email=author_email,
            server_name=server_name,
        )

    else:  # should never get here
        content = f"{event}: {result}"

    return content, project_name, branch_name


def semaphore_2(payload: Dict[str, Any]) -> Tuple[str, str, Optional[str]]:
    repo_url = payload["repository"]["url"]
    project_name = payload["project"]["name"]
    organization_name = payload["organization"]["name"]
    author_name = payload["revision"]["sender"]["login"]
    workflow_id = payload['workflow']['id']
    context = dict(
        author_name=author_name,
        author_url=GITHUB_URL_TEMPLATES['user'].format(repo_url=repo_url, username=author_name),
        pipeline_name=payload["pipeline"]["name"],
        pipeline_result=payload["pipeline"]["result"],
        workflow_url=f'https://{organization_name}.semaphoreci.com/workflows/{workflow_id}',
    )

    if payload["revision"]["reference_type"] == "branch":  # push event
        commit_id = payload["revision"]["commit_sha"]
        branch_name = payload["revision"]["branch"]["name"]
        context.update(
            branch_name=branch_name,
            commit_id=commit_id,
            commit_hash=commit_id[:7],
            commit_message=summary_line(payload["revision"]["commit_message"]),
            commit_url=GITHUB_URL_TEMPLATES['commit'].format(
                repo_url=repo_url, commit_id=commit_id
            ),
        )
        template = GH_PUSH_TEMPLATE if is_github_repo(repo_url) else PUSH_TEMPLATE
        content = template.format(**context)
    elif payload["revision"]["reference_type"] == "pull_request":
        pull_request = payload["revision"]["pull_request"]
        branch_name = pull_request["branch_name"]
        pull_request_title = pull_request["name"]
        pull_request_number = pull_request["number"]
        pull_request_url = GITHUB_URL_TEMPLATES['pull_request'].format(
            repo_url=repo_url, pr_number=pull_request_number
        )
        context.update(
            branch_name=branch_name,
            pull_request_title=pull_request_title,
            pull_request_url=pull_request_url,
            pull_request_number=pull_request_number,
        )
        template = GH_PULL_REQUEST_TEMPLATE if is_github_repo(repo_url) else PULL_REQUEST_TEMPLATE
        content = template.format(**context)
    elif payload["revision"]["reference_type"] == "tag":
        branch_name = ''
        tag_name = payload["revision"]["tag"]["name"]
        tag_url = GITHUB_URL_TEMPLATES['tag'].format(repo_url=repo_url, tag_name=tag_name)
        context.update(
            tag_name=tag_name,
            tag_url=tag_url,
        )
        template = GH_TAG_TEMPLATE if is_github_repo(repo_url) else TAG_TEMPLATE
        content = template.format(**context)
    else:  # should never get here: unknown event
        branch_name = ''
        context.update(event_name=payload["revision"]["reference_type"])
        content = DEFAULT_TEMPLATE.format(**context)
    return content, project_name, branch_name


def is_github_repo(repo_url: str) -> bool:
    return urlparse(repo_url).hostname == 'github.com'


def summary_line(message: str) -> str:
    return message.splitlines()[0]