from typing import Any, Dict, Iterable

from django.http import HttpRequest, HttpResponse

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.models import UserProfile

REVIEW_REQUEST_PUBLISHED = """
**{user_name}** opened [#{id}: {review_request_title}]({review_request_url}):
"""

REVIEW_REQUEST_REOPENED = """
**{user_name}** reopened [#{id}: {review_request_title}]({review_request_url}):
"""

REVIEW_REQUEST_CLOSED = """
**{user_name}** closed [#{id}: {review_request_title}]({review_request_url}):
"""

REVIEW_PUBLISHED = """
**{user_name}** [reviewed]({review_url}) [#{id}: {review_request_title}]({review_request_url}):

**Review**:
``` quote
{review_body_top}
```
"""

REVIEW_REQUEST_DETAILS = """
``` quote
**Description**: {description}
**Status**: {status}
**Target people**: {target_people}
{extra_info}
```
"""

REPLY_PUBLISHED = """
**{user_name}** [replied]({reply_url}) to [#{id}: {review_request_title}]({review_request_url}):

**Reply**:
``` quote
{reply_body_top}
```
"""

BRANCH_TEMPLATE = "**Branch**: {branch_name}"

fixture_to_headers = get_http_headers_from_filename("HTTP_X_REVIEWBOARD_EVENT")


def get_target_people_string(payload: Dict[str, Any]) -> str:
    result = ""
    target_people = payload["review_request"]["target_people"]
    if len(target_people) == 1:
        result = "**{title}**".format(**target_people[0])
    else:
        for target_person in target_people[:-1]:
            result += "**{title}**, ".format(**target_person)
        result += "and **{title}**".format(**target_people[-1])

    return result


def get_review_published_body(payload: Dict[str, Any]) -> str:
    kwargs = {
        "review_url": payload["review"]["absolute_url"],
        "id": payload["review_request"]["id"],
        "review_request_title": payload["review_request"]["summary"],
        "review_request_url": payload["review_request"]["absolute_url"],
        "user_name": payload["review"]["links"]["user"]["title"],
        "review_body_top": payload["review"]["body_top"],
    }

    return REVIEW_PUBLISHED.format(**kwargs).strip()


def get_reply_published_body(payload: Dict[str, Any]) -> str:
    kwargs = {
        "reply_url": payload["reply"]["links"]["self"]["href"],
        "id": payload["review_request"]["id"],
        "review_request_title": payload["review_request"]["summary"],
        "review_request_url": payload["review_request"]["links"]["self"]["href"],
        "user_name": payload["reply"]["links"]["user"]["title"],
        "user_url": payload["reply"]["links"]["user"]["href"],
        "reply_body_top": payload["reply"]["body_top"],
    }

    return REPLY_PUBLISHED.format(**kwargs).strip()


def get_review_request_published_body(payload: Dict[str, Any]) -> str:
    kwargs = {
        "id": payload["review_request"]["id"],
        "review_request_title": payload["review_request"]["summary"],
        "review_request_url": payload["review_request"]["absolute_url"],
        "user_name": payload["review_request"]["links"]["submitter"]["title"],
        "description": payload["review_request"]["description"],
        "status": payload["review_request"]["status"],
        "target_people": get_target_people_string(payload),
        "extra_info": "",
    }

    message = REVIEW_REQUEST_PUBLISHED + REVIEW_REQUEST_DETAILS
    branch = payload["review_request"].get("branch")
    if branch and branch is not None:
        branch_info = BRANCH_TEMPLATE.format(branch_name=branch)
        kwargs["extra_info"] = branch_info

    return message.format(**kwargs).strip()


def get_review_request_reopened_body(payload: Dict[str, Any]) -> str:
    kwargs = {
        "id": payload["review_request"]["id"],
        "review_request_title": payload["review_request"]["summary"],
        "review_request_url": payload["review_request"]["absolute_url"],
        "user_name": payload["reopened_by"]["username"],
        "description": payload["review_request"]["description"],
        "status": payload["review_request"]["status"],
        "target_people": get_target_people_string(payload),
        "extra_info": "",
    }

    message = REVIEW_REQUEST_REOPENED + REVIEW_REQUEST_DETAILS
    branch = payload["review_request"].get("branch")
    if branch and branch is not None:
        branch_info = BRANCH_TEMPLATE.format(branch_name=branch)
        kwargs["extra_info"] = branch_info

    return message.format(**kwargs).strip()


def get_review_request_closed_body(payload: Dict[str, Any]) -> str:
    kwargs = {
        "id": payload["review_request"]["id"],
        "review_request_title": payload["review_request"]["summary"],
        "review_request_url": payload["review_request"]["absolute_url"],
        "user_name": payload["closed_by"]["username"],
        "description": payload["review_request"]["description"],
        "status": payload["review_request"]["status"],
        "target_people": get_target_people_string(payload),
        "extra_info": "**Close type**: {}".format(payload["close_type"]),
    }

    message = REVIEW_REQUEST_CLOSED + REVIEW_REQUEST_DETAILS
    branch = payload["review_request"].get("branch")
    if branch and branch is not None:
        branch_info = BRANCH_TEMPLATE.format(branch_name=branch)
        kwargs["extra_info"] = "{}\n{}".format(kwargs["extra_info"], branch_info)

    return message.format(**kwargs).strip()


def get_review_request_repo_title(payload: Dict[str, Any]) -> str:
    return payload["review_request"]["links"]["repository"]["title"]


RB_MESSAGE_FUNCTIONS = {
    "review_request_published": get_review_request_published_body,
    "review_request_reopened": get_review_request_reopened_body,
    "review_request_closed": get_review_request_closed_body,
    "review_published": get_review_published_body,
    "reply_published": get_reply_published_body,
}


@webhook_view("ReviewBoard")
@has_request_variables
def api_reviewboard_webhook(
    request: HttpRequest,
    user_profile: UserProfile,
    payload: Dict[str, Iterable[Dict[str, Any]]] = REQ(argument_type="body"),
) -> HttpResponse:
    event_type = validate_extract_webhook_http_header(request, "X_REVIEWBOARD_EVENT", "ReviewBoard")
    assert event_type is not None

    body_function = RB_MESSAGE_FUNCTIONS.get(event_type)
    if body_function is not None:
        body = body_function(payload)
        topic = get_review_request_repo_title(payload)
        check_send_webhook_message(request, user_profile, topic, body)
    else:
        raise UnsupportedWebhookEventType(event_type)

    return json_success()