#!/usr/bin/env python3

from __future__ import annotations

import base64
import json
import os
import time
from pathlib import Path
from typing import Callable, TypeVar

from tencentcloud.common import credential
from tencentcloud.common.exception.tencent_cloud_sdk_exception import TencentCloudSDKException
from tencentcloud.common.profile.client_profile import ClientProfile
from tencentcloud.common.profile.http_profile import HttpProfile
from tencentcloud.cvm.v20170312 import cvm_client, models as cvm_models
from tencentcloud.tat.v20201028 import models as tat_models, tat_client


ROOT = Path(__file__).resolve().parents[1]
DEFAULT_INSTANCE_ID = os.environ.get("DEPLOY_INSTANCE_ID", "ins-ntmpcd3a")
DEFAULT_REGION = os.environ.get("DEPLOY_REGION", "me-saudi-arabia")
DEFAULT_PORT = int(os.environ.get("OPEN_PORT", "6666"))
DEFAULT_CIDR = os.environ.get("OPEN_CIDR", "0.0.0.0/0")
T = TypeVar("T")


def env_required(name: str) -> str:
    value = os.environ.get(name, "").strip()
    if not value:
        raise SystemExit(f"missing env: {name}")
    return value


def build_cvm(secret_id: str, secret_key: str, region: str) -> cvm_client.CvmClient:
    cred = credential.Credential(secret_id, secret_key)
    return cvm_client.CvmClient(
        cred,
        region,
        ClientProfile(httpProfile=HttpProfile(endpoint="cvm.tencentcloudapi.com")),
    )


def build_tat(secret_id: str, secret_key: str, region: str) -> tat_client.TatClient:
    cred = credential.Credential(secret_id, secret_key)
    return tat_client.TatClient(
        cred,
        region,
        ClientProfile(httpProfile=HttpProfile(endpoint="tat.tencentcloudapi.com")),
    )


def invoke(action: Callable[[], T], label: str, retries: int = 4, delay_seconds: int = 2) -> T:
    last_error: Exception | None = None
    for attempt in range(1, retries + 1):
        try:
            return action()
        except TencentCloudSDKException as exc:
            last_error = exc
            if attempt == retries:
                break
            time.sleep(delay_seconds * attempt)
    if last_error is not None:
        raise last_error
    raise RuntimeError(f"{label} failed without error")


def resolve_security_group_id(client: cvm_client.CvmClient, instance_id: str) -> str:
    req = cvm_models.DescribeInstancesRequest()
    req.from_json_string(json.dumps({"InstanceIds": [instance_id]}))
    resp = json.loads(invoke(lambda: client.DescribeInstances(req), "DescribeInstances").to_json_string())
    instances = resp.get("InstanceSet") or []
    if not instances:
        raise SystemExit(f"instance not found: {instance_id}")
    security_group_ids = instances[0].get("SecurityGroupIds") or []
    if not security_group_ids:
        raise SystemExit(f"no security group attached: {instance_id}")
    return str(security_group_ids[0])


def remote_script(secret_id: str, secret_key: str, region: str, security_group_id: str, port: int, cidr: str) -> str:
    payload = {
        "secret_id": secret_id,
        "secret_key": secret_key,
        "region": region,
        "security_group_id": security_group_id,
        "port": port,
        "cidr": cidr,
    }
    blob = base64.b64encode(json.dumps(payload).encode("utf-8")).decode("ascii")
    return f"""set -euo pipefail

if command -v firewall-cmd >/dev/null 2>&1; then
  firewall-cmd --add-port={port}/tcp --permanent >/dev/null 2>&1 || true
  firewall-cmd --reload >/dev/null 2>&1 || true
fi

if command -v ufw >/dev/null 2>&1; then
  ufw allow {port}/tcp >/dev/null 2>&1 || true
fi

if command -v iptables >/dev/null 2>&1; then
  iptables -C INPUT -p tcp --dport {port} -j ACCEPT >/dev/null 2>&1 || iptables -I INPUT -p tcp --dport {port} -j ACCEPT || true
fi

python3 -m pip install --user -q tencentcloud-sdk-python >/dev/null 2>&1 || true

python3 - <<'PY'
import base64
import json

from tencentcloud.common import credential
from tencentcloud.common.profile.client_profile import ClientProfile
from tencentcloud.common.profile.http_profile import HttpProfile
from tencentcloud.vpc.v20170312 import vpc_client, models
from tencentcloud.common.exception.tencent_cloud_sdk_exception import TencentCloudSDKException

payload = json.loads(base64.b64decode({blob!r}).decode('utf-8'))
cred = credential.Credential(payload['secret_id'], payload['secret_key'])
client = vpc_client.VpcClient(
    cred,
    payload['region'],
    ClientProfile(httpProfile=HttpProfile(endpoint='vpc.tencentcloudapi.com')),
)

req = models.CreateSecurityGroupPoliciesRequest()
req.from_json_string(json.dumps({{
    'SecurityGroupId': payload['security_group_id'],
    'SecurityGroupPolicySet': {{
        'Ingress': [{{
            'Protocol': 'TCP',
            'Port': str(payload['port']),
            'CidrBlock': payload['cidr'],
            'Action': 'ACCEPT',
            'PolicyDescription': 'hy-app-monitor 6666',
        }}]
    }}
}}))

try:
    client.CreateSecurityGroupPolicies(req)
    print('security_group_rule=created')
except TencentCloudSDKException as exc:
    if 'Duplicate' in str(exc) or 'already exists' in str(exc):
        print('security_group_rule=exists')
    else:
        raise
PY

echo "port_opened={port}"
"""


def run_tat_script(client: tat_client.TatClient, instance_id: str, script: str, timeout_seconds: int = 300) -> str:
    req = tat_models.RunCommandRequest()
    req.from_json_string(
        json.dumps(
            {
                "CommandName": "hy-app-monitor-open-port",
                "CommandType": "SHELL",
                "Content": base64.b64encode(script.encode("utf-8")).decode("ascii"),
                "InstanceIds": [instance_id],
                "Timeout": timeout_seconds,
                "WorkingDirectory": "/root",
            }
        )
    )
    resp = json.loads(invoke(lambda: client.RunCommand(req), "RunCommand").to_json_string())
    invocation_id = resp["InvocationId"]
    deadline = time.time() + timeout_seconds + 120

    while time.time() < deadline:
        time.sleep(3)
        query = tat_models.DescribeInvocationTasksRequest()
        query.from_json_string(
            json.dumps(
                {
                    "HideOutput": False,
                    "Limit": 20,
                    "Filters": [{"Name": "invocation-id", "Values": [invocation_id]}],
                }
            )
        )
        data = json.loads(invoke(lambda: client.DescribeInvocationTasks(query), "DescribeInvocationTasks").to_json_string())
        tasks = data.get("InvocationTaskSet") or []
        if not tasks:
            continue
        task = tasks[0]
        status = task["TaskStatus"]
        if status in {"SUCCESS", "FAILED", "TIMEOUT", "CANCELLED", "START_FAILED"}:
            output = base64.b64decode(task.get("TaskResult", {}).get("Output", "")).decode("utf-8", errors="replace")
            if status != "SUCCESS":
                raise SystemExit(output or f"TAT task failed: {status}")
            return output
    raise SystemExit("TAT task timed out")


def main() -> None:
    secret_id = env_required("TENCENT_SECRET_ID")
    secret_key = env_required("TENCENT_SECRET_KEY")
    instance_id = os.environ.get("DEPLOY_INSTANCE_ID", DEFAULT_INSTANCE_ID)
    region = os.environ.get("DEPLOY_REGION", DEFAULT_REGION)
    port = int(os.environ.get("OPEN_PORT", str(DEFAULT_PORT)))
    cidr = os.environ.get("OPEN_CIDR", DEFAULT_CIDR)

    cvm = build_cvm(secret_id, secret_key, region)
    tat = build_tat(secret_id, secret_key, region)
    security_group_id = os.environ.get("SECURITY_GROUP_ID", "").strip() or resolve_security_group_id(cvm, instance_id)

    output = run_tat_script(tat, instance_id, remote_script(secret_id, secret_key, region, security_group_id, port, cidr))
    print(f"instance_id={instance_id}")
    print(f"security_group_id={security_group_id}")
    print(output.strip())


if __name__ == "__main__":
    main()