import os
import paramiko
import subprocess
import time
import logging
import random
import string
import argparse
import configparser
import boto3
from digitalocean import Manager, Droplet
from hcloud import Client
from hcloud.server_types.client import ServerType
from hcloud.images.client import Image
from hcloud.locations.client import LocationsClient
from hcloud.ssh_keys.client import SSHKeysClient
from hcloud.servers.domain import ServerCreatePublicNetwork
from azure.identity import ClientSecretCredential
from azure.mgmt.compute import ComputeManagementClient
from azure.mgmt.network import NetworkManagementClient
from azure.mgmt.resource import ResourceManagementClient

# Set up logging
logging.basicConfig(
    format="[%(asctime)s] %(levelname)s: %(message)s",
    level=logging.INFO,
)

random_string = "".join(random.choices(string.ascii_lowercase + string.digits, k=8))


# Function to create a server on Hetzner Cloud
def create_hetzner_server(hetzner_config, location, server_type):
    api_token = hetzner_config["api_token"]
    client = Client(token=api_token)
    server_type = ServerType(name=server_type)
    image_name = hetzner_config["image"]
    image = Image(name=image_name)
    location = LocationsClient(client).get_by_name(location)
    ssh_key = SSHKeysClient(client).get_all()[0]
    public_network = ServerCreatePublicNetwork(enable_ipv4=False, enable_ipv6=True)

    logging.info("Creating Hetzner server...")

    server = client.servers.create(
        name="wireguard-vps-" + random_string,
        server_type=server_type,
        image=image,
        location=location,
        ssh_keys=[ssh_key],
        public_net=public_network,
    )

    while not server.server.status == "running":
        time.sleep(5)
        server.server.reload()

    return server.server


# Function to get the latest AMI ID by name
def get_ami_id_by_name(ec2_client, ami_name):
    response = ec2_client.describe_images(
        Filters=[
            {"Name": "name", "Values": [ami_name]},
            {"Name": "state", "Values": ["available"]},
        ],
        Owners=["self", "amazon"],
    )
    images = sorted(response["Images"], key=lambda x: x["CreationDate"], reverse=True)
    if images:
        return images[0]["ImageId"]
    else:
        raise ValueError(f"No AMI found with name pattern {ami_name}")


# Function to create a server on AWS
def create_aws_server(aws_config, location, server_type):
    access_key = aws_config["access_key"]
    secret_key = aws_config["secret_key"]
    region = aws_config["region"]
    ami_name = aws_config["ami_name"]
    key_pair = aws_config["key_pair"]

    ec2_client = boto3.client(
        "ec2",
        aws_access_key_id=access_key,
        aws_secret_access_key=secret_key,
        region_name=region,
    )

    ami_id = get_ami_id_by_name(ec2_client, ami_name)

    ec2 = boto3.resource(
        "ec2",
        aws_access_key_id=access_key,
        aws_secret_access_key=secret_key,
        region_name=region,
    )

    logging.info("Creating AWS server...")

    instances = ec2.create_instances(
        ImageId=ami_id,
        MinCount=1,
        MaxCount=1,
        InstanceType=server_type,
        KeyName=key_pair,
    )

    return instances[0]


# Function to create a server on DigitalOcean
def create_digitalocean_server(digitalocean_config, location, server_type):
    api_token = digitalocean_config["api_token"]
    manager = Manager(token=api_token)

    logging.info("Creating DigitalOcean server...")

    droplet = Droplet(
        token=api_token,
        name="wireguard-vps-" + random_string,
        region=location,
        image="debian-12-x64",
        size_slug=server_type,
        ssh_keys=manager.get_all_sshkeys(),
    )

    droplet.create()
    return droplet


# Function to create a server on Azure
def create_azure_server(azure_config, location, server_type):
    subscription_id = azure_config["subscription_id"]
    client_id = azure_config["client_id"]
    client_secret = azure_config["client_secret"]
    tenant_id = azure_config["tenant_id"]
    vm_size = server_type
    image_publisher = azure_config["image_publisher"]
    image_offer = azure_config["image_offer"]
    image_sku = azure_config["image_sku"]

    credential = ClientSecretCredential(
        client_id=client_id, client_secret=client_secret, tenant_id=tenant_id
    )
    resource_client = ResourceManagementClient(credential, subscription_id)
    compute_client = ComputeManagementClient(credential, subscription_id)
    network_client = NetworkManagementClient(credential, subscription_id)

    resource_group_name = f"rg-{random_string}"
    network_name = f"vnet-{random_string}"
    subnet_name = f"subnet-{random_string}"
    ip_name = f"ip-{random_string}"
    nic_name = f"nic-{random_string}"
    vm_name = f"vm-{random_string}"

    logging.info("Creating Azure resource group...")
    resource_client.resource_groups.create_or_update(
        location=location, resource_group_name=resource_group_name
    )

    logging.info("Creating Azure virtual network...")
    network_client.virtual_networks.begin_create_or_update(
        resource_group_name,
        network_name,
        {"location": location, "address_space": {"address_prefixes": ["10.0.0.0/16"]}},
    ).result()

    logging.info("Creating Azure subnet...")
    network_client.subnets.begin_create_or_update(
        resource_group_name,
        network_name,
        subnet_name,
        {"address_prefix": "10.0.0.0/24"},
    ).result()

    logging.info("Creating Azure public IP address...")
    ip_address = network_client.public_ip_addresses.begin_create_or_update(
        resource_group_name,
        ip_name,
        {"location": location, "public_ip_allocation_method": "Dynamic"},
    ).result()

    logging.info("Creating Azure network interface...")
    nic = network_client.network_interfaces.begin_create_or_update(
        resource_group_name,
        nic_name,
        {
            "location": location,
            "ip_configurations": [
                {
                    "name": "ipconfig1",
                    "public_ip_address": ip_address,
                    "subnet": {
                        "id": f"/subscriptions/{subscription_id}/resourceGroups/{resource_group_name}/providers/Microsoft.Network/virtualNetworks/{network_name}/subnets/{subnet_name}"
                    },
                }
            ],
        },
    ).result()

    logging.info("Creating Azure virtual machine...")
    vm = compute_client.virtual_machines.begin_create_or_update(
        resource_group_name,
        vm_name,
        {
            "location": location,
            "storage_profile": {
                "image_reference": {
                    "publisher": image_publisher,
                    "offer": image_offer,
                    "sku": image_sku,
                    "version": "latest",
                }
            },
            "hardware_profile": {"vm_size": vm_size},
            "os_profile": {
                "computer_name": vm_name,
                "admin_username": "azureuser",
                "admin_password": "P@ssw0rd!",
            },
            "network_profile": {"network_interfaces": [{"id": nic.id}]},
        },
    ).result()

    return vm, ip_address.ip_address


# Function to execute commands on the server
def ssh_execute_command(ip, command):
    logging.info(f"Executing command on {ip}: {command}")
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(ip, username="root", key_filename=os.path.expanduser("~/.ssh/id_rsa"))
    stdin, stdout, stderr = ssh.exec_command(command)
    output = stdout.read().decode()
    error = stderr.read().decode()
    ssh.close()
    return output, error


# Function to generate a random private key
def generate_private_key():
    return subprocess.check_output("wg genkey", shell=True).decode().strip()


# Function to convert private key to public key
def private_to_public_key(private_key):
    return (
        subprocess.check_output(f"echo {private_key} | wg pubkey", shell=True)
        .decode()
        .strip()
    )


# Function to generate a random preshared key
def generate_preshared_key():
    return subprocess.check_output("wg genpsk", shell=True).decode().strip()


# Function to generate Wireguard keys
def generate_wireguard_keys():
    logging.info("Generating Wireguard keys...")
    private_key = generate_private_key()
    public_key = private_to_public_key(private_key)
    preshared_key = generate_preshared_key()
    return private_key, public_key, preshared_key


# Function to configure Wireguard on the VPS
def configure_wireguard(wireguard_config, server_ip, private_key, public_key, preshared_key):
    address = wireguard_config["address"]
    listen_port = wireguard_config["listen_port"]

    peer_public_key = wireguard_config["peer_public_key"]
    allowed_ips = wireguard_config["peer_allowed_ips"]
    endpoint = wireguard_config["peer_endpoint"]
    persistent_keepalive = wireguard_config["peer_persistent_keepalive"]

    wg_config = f"""
[Interface]
Address = {address}
PrivateKey = {private_key}
ListenPort = {listen_port}

[Peer]
PublicKey = {peer_public_key}
PresharedKey = {preshared_key}
AllowedIPs = {allowed_ips}
Endpoint = {endpoint}
PersistentKeepalive = {persistent_keepalive}
"""

    ssh_execute_command(server_ip, f"echo '{wg_config}' > /etc/wireguard/wg0.conf")
    ssh_execute_command(server_ip, "wg-quick up wg0")

    # Configure ip(6)tables
    iptables_rules = [
        "ip6tables -A FORWARD -i wg0 -j ACCEPT",
        "ip6tables -A FORWARD -o wg0 -j ACCEPT",
        "ip6tables -t nat -A POSTROUTING -o eth0 -j MASQUERADE",
        "iptables -A FORWARD -i wg0 -j ACCEPT",
        "iptables -A FORWARD -o wg0 -j ACCEPT",
        "iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE",
    ]

    for rule in iptables_rules:
        ssh_execute_command(server_ip, rule)


# Main function to create and configure the server
def run(config, provider, location, server_type, endpoint_only):
    if provider == "hetzner":
        location = location or config["hetzner"]["location"]
        server_type = server_type or config["hetzner"]["server_type"]
        server = create_hetzner_server(config["hetzner"], location, server_type)
        server_ip = server.public_net.ipv6.ip.split("/")[0] + "1"
    elif provider == "aws":
        location = location or config["aws"]["region"]
        server_type = server_type or config["aws"]["instance_type"]
        server = create_aws_server(config["aws"], location, server_type)
        server_ip = server.public_ip_address
    elif provider == "digitalocean":
        location = location or config["digitalocean"]["region"]
        server_type = server_type or config["digitalocean"]["server_type"]
        server = create_digitalocean_server(config["digitalocean"], location, server_type)
        server.load()
        server_ip = server.ip_address
    elif provider == "azure":
        location = location or config["azure"]["location"]
        server_type = server_type or config["azure"]["vm_size"]
        server, server_ip = create_azure_server(config["azure"], location, server_type)
    else:
        raise ValueError("Unsupported provider")

    logging.info(f"Server IP: {server_ip}")

    # Giving server time to boot up
    logging.info("Waiting for server to boot up...")
    time.sleep(30)

    # Install Wireguard and configure it
    commands = [
        "apt update",
        "apt install -y wireguard",
        "echo 'net.ipv6.conf.all.forwarding=1' >> /etc/sysctl.conf",
        "echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf",
        "sysctl -p",
    ]

    for command in commands:
        ssh_execute_command(server_ip, command)

    # Check if private key and preshared key are provided
    if config.get("wireguard", "private_key", fallback=None):
        private_key = config["wireguard"]["private_key"]
    else:
        private_key = generate_private_key()

    if config.get("wireguard", "preshared_key", fallback=None):
        preshared_key = config["wireguard"]["preshared_key"]
    else:
        preshared_key = generate_preshared_key()

    public_key = private_to_public_key(private_key)

    configure_wireguard(config["wireguard"], server_ip, private_key, public_key, preshared_key)

    # Generate client configuration for Chimpman
    wireguard_address = config["wireguard"]["address"]
    routed_addresses = config["wireguard"]["routed_addresses"]
    listen_port = config["wireguard"]["listen_port"]
    persistent_keepalive = config["wireguard"]["peer_persistent_keepalive"]

    if endpoint_only:
        print(f"[{server_ip}]:{listen_port}")
        return

    peer_config = f"""
[Peer]
PublicKey = {public_key}
PresharedKey = {preshared_key}
AllowedIPs = {wireguard_address}, {routed_addresses}
Endpoint = [{server_ip}]:{listen_port}
PersistentKeepalive = {persistent_keepalive}
"""

    print(peer_config)


def main():
    # Read configuration
    config = configparser.ConfigParser()
    config.read("config.ini")

    # Argument parser
    parser = argparse.ArgumentParser(
        description="Create and configure a Wireguard server."
    )
    parser.add_argument(
        "--provider",
        type=str,
        choices=["hetzner", "aws", "digitalocean", "azure"],
        default="hetzner",
        help="Cloud provider (default: hetzner)",
    )
    parser.add_argument("--location", type=str, help="Server location")
    parser.add_argument("--server_type", type=str, help="Server type")
    parser.add_argument("--endpoint-only", action="store_true", help="Return Wireguard endpoint (host:port) instead of full configuration")
    args = parser.parse_args()

    # Check if the configuration has all the required sections
    required = ["wireguard", args.provider]

    for section in required:
        if section not in config:
            raise ValueError(f"Missing section {section} in config.ini")

    # Run the main function with parsed arguments
    run(config, args.provider, args.location, args.server_type, args.endpoint_only)


if __name__ == "__main__":
    main()