import json
import logging
from typing import Any, List, Tuple

from fastapi import Request

from ops_bot.common import COLOR_ALARM, COLOR_OK, COLOR_UNKNOWN, COLOR_WARNING
from ops_bot.config import RoutingKey


def handle_subscribe_confirm(payload: Any) -> List[Tuple[str, str]]:
    message = payload.get("Message")
    url = payload.get("SubscribeURL")
    plain = f"{message}\n\n{url}"
    return [(plain, plain)]


def handle_notification(payload: Any) -> List[Tuple[str, str]]:
    message = payload.get("Message")
    subject = payload.get("Subject")

    plain = f"{subject}\n{message}"
    formatted = (
        f"<strong><font color={COLOR_ALARM}>{subject}</font></strong>\n<p>{message}</p>"
    )
    return [(plain, formatted)]


def handle_json_notification(payload: Any, body: Any) -> List[Tuple[str, str]]:
    if "AlarmName" not in body:
        payload_str = payload.get("Message")
        msg = "Received unknown json payload type over AWS SNS"
        msg += f"""\n<br/>
```json
{payload_str}
```"""
        logging.info(msg)
        logging.info(payload.get("Message"))
        return [(msg, msg)]

    description = body.get("AlarmDescription")
    subject = payload.get("Subject")
    state_value = body.get("NewStateValue", "unknown")

    if state_value == "ALARM":
        color = COLOR_ALARM
    elif state_value == "OK":
        color = COLOR_OK
    else:
        color = COLOR_UNKNOWN

    plain = f"{subject}"
    formatted = f"<strong><font color={color}>{subject}</font></strong>\n"

    if state_value == "OK":
        plain += "\n(this alarm has been resolved!)"
        formatted += "\n<p>(this alarm has been resolved!)</p>"
    else:
        plain += "\n{description}"
        formatted += f"\n<p>{description}</p>"
    return [(plain, formatted)]


def handle_cloudtrail_signin(payload: Any) -> List[Tuple[str, str]]:
    region = payload["region"]
    event_type = payload["detail"]["eventType"]
    event_time = payload["detail"]["eventTime"]

    account_id = None
    if "accountId" in payload["detail"]["userIdentity"]:
        account_id = payload["detail"]["userIdentity"]["accountId"]
    else:
        account_id = payload["detail"]["recipientAccountId"]

    user_type = payload["detail"]["userIdentity"]["type"]
    if user_type == "IAMUser":
        user = payload["detail"]["userIdentity"]["userName"]
    elif user_type == "Root":
        user = "Root User"
    elif user_type == "AssumedRole":
        user = payload["detail"]["userIdentity"]["principalId"]
    else:
        user = "Unknown user"

    mfa_used = "unknown"
    if (
        "additionalEventData" in payload["detail"]
        and "MFAUsed" in payload["detail"]["additionalEventData"]
    ):
        mfa_used = payload["detail"]["additionalEventData"]["MFAUsed"]

    was_failure = False
    if (
        "responseElements" in payload["detail"]
        and "ConsoleLogin" in payload["detail"]["responseElements"]
    ):
        was_failure = payload["detail"]["responseElements"]["ConsoleLogin"] == "Failure"

    error_message = None
    if "errorMessage" in payload["detail"]:
        error_message = payload["detail"]["errorMessage"]

    if was_failure:
        title = f"Failed AWS Console Sign attempt by user `{user}`."
        color = COLOR_WARNING
    else:
        title = f"AWS Console Sign detected by user `{user}`."
        color = COLOR_ALARM

    formatted = [
        x
        for x in [
            f"<font color={color}>**🚨 ALERT[{event_type}]** </font>: {title}",
            f"- **Region**: {region}",
            f"- **MFA Used**: {mfa_used}",
            (f"- **Error Message**: {error_message}" if error_message else None),
            f"- **Event Time**: {event_time}",
            f"- **Account ID**: {account_id}",
        ]
        if x is not None
    ]

    plain = title

    return [(plain, "<br/>".join(formatted))]


def handle_cloudtrail_generic(payload: Any) -> List[Tuple[str, str]]:
    region = payload["region"]
    event_type = payload["detail"]["eventType"]
    event_time = payload["detail"]["eventTime"]
    account_id = payload["detail"]["recipientAccountId"]
    detail = payload["detail-type"]

    plain = f"{detail}"

    formatted = [
        f"<font color={COLOR_UNKNOWN}>**⚠️CLOUDTRAIL EVENT[{event_type}]**</font>: {detail}",
        f"**Region**: {region}",
        f"**Event Time**: {event_time}",
        f"**Account ID**: {account_id}",
    ]

    return [(plain, "<br/>".join(formatted))]


async def parse_sns_event(
    route: RoutingKey,
    payload: Any,
    request: Request,
) -> List[Tuple[str, str]]:
    if payload.get("Type") == "SubscriptionConfirmation":
        return handle_subscribe_confirm(payload)
    elif payload.get("Type") == "UnsubscribeConfirmation":
        return handle_subscribe_confirm(payload)
    elif payload.get("Type") == "Notification":
        try:
            body = json.loads(payload.get("Message"))
            return handle_json_notification(payload, body)
        except Exception:
            return handle_notification(payload)
    elif "source" in payload:
        source = payload["source"]
        if source == "aws.signin":
            return handle_cloudtrail_signin(payload)
        else:
            return handle_cloudtrail_generic(payload)

    raise Exception("Unnown SNS payload type")