from pathlib import Path
from tempfile import TemporaryDirectory

import typer
import yaml
from rich.table import Table

from src.aws import cloudformation, identity, mlflow
from src.commands.utils import CONFIG_OPT, CONSOLE, load_cfg
from src.config import Config, MlflowMode
from src.infra import provisioning
from src.infra.state import read_infra_state

app = typer.Typer(help="Manage AWS infrastructure")


@app.command()
def setup(
    config: str = CONFIG_OPT,
    bootstrap: bool = typer.Option(
        True,
        "--bootstrap/--no-bootstrap",
        help="Run CDK bootstrap before deploying the application stack",
    ),
    cloudformation_execution_policy: str | None = typer.Option(
        None,
        "--cloudformation-execution-policy",
        help="IAM policy ARN for the CDK bootstrap CloudFormation execution role",
    ),
) -> None:
    """Create infrastructure with AWS CDK."""
    cfg = load_cfg(config)
    CONSOLE.print("[bold]Deploying infrastructure with AWS CDK...[/bold]")

    try:
        account_id = identity.account_id(cfg.aws.region, cfg.aws.profile)
        if cfg.mlflow.mode is MlflowMode.existing:
            assert cfg.mlflow.tracking_server_name is not None
            with CONSOLE.status("Checking MLflow tracking server..."):
                server = mlflow.describe_tracking_server(
                    cfg.aws.region,
                    cfg.aws.profile,
                    cfg.mlflow.tracking_server_name,
                )
            if server is None:
                raise RuntimeError(f"MLflow tracking server not found: {cfg.mlflow.tracking_server_name}")

        if bootstrap:
            with CONSOLE.status("Running cdk bootstrap..."):
                provisioning.bootstrap(
                    profile=cfg.aws.profile,
                    account_id=account_id,
                    region=cfg.aws.region,
                    bootstrap_qualifier=cfg.infra.effective_bootstrap_qualifier,
                    toolkit_stack_name=cfg.infra.effective_toolkit_stack_name,
                    cloudformation_execution_policy=cloudformation_execution_policy,
                )
        with CONSOLE.status("Running cdk deploy..."):
            state = provisioning.deploy(
                profile=cfg.aws.profile,
                account_id=account_id,
                region=cfg.aws.region,
                stack_name=cfg.infra.stack_name,
                bootstrap_qualifier=cfg.infra.effective_bootstrap_qualifier,
                toolkit_stack_name=cfg.infra.effective_toolkit_stack_name,
                config_path=config,
                config_dir=str(Path(config).parent),
                config_snapshot=cfg.model_dump(mode="json"),
            )
    except RuntimeError as e:
        CONSOLE.print(f"[red]{e}[/red]")
        raise typer.Exit(1)

    outputs = state.get("outputs", {})
    if outputs.get("DataBucketArn"):
        CONSOLE.print(f"[green]✓[/green] S3 bucket: {outputs['DataBucketArn']}")
    if outputs.get("SageMakerRoleArn"):
        CONSOLE.print(f"[green]✓[/green] IAM role:  {outputs['SageMakerRoleArn']}")
    if cfg.mlflow.mode is MlflowMode.create and outputs.get("MlflowTrackingServerArn"):
        mlflow_name = outputs.get("MlflowTrackingServerName", cfg.managed_mlflow_tracking_server_name)
        CONSOLE.print(f"[green]✓[/green] MLflow:    {mlflow_name}")
    elif cfg.mlflow.mode is MlflowMode.existing:
        CONSOLE.print(f"[green]✓[/green] MLflow:    {cfg.mlflow.tracking_server_name}")
    CONSOLE.print("\n[bold green]Infrastructure ready.[/bold green]")


@app.command()
def status(config: str = CONFIG_OPT) -> None:
    """Show current infrastructure status."""
    cfg = load_cfg(config)
    stack = cloudformation.stack_status(cfg.aws.region, cfg.aws.profile, cfg.infra.stack_name)

    table = Table(title="Infrastructure Status")
    table.add_column("Resource", style="cyan")
    table.add_column("Name")
    table.add_column("Status")
    table.add_column("ARN / URI")

    if not stack:
        table.add_row("CDK Stack", cfg.infra.stack_name, "[red]missing[/red]", "-")
        table.add_row("S3 Bucket", cfg.s3.bucket, "[red]unknown[/red]", "-")
        table.add_row("IAM Role", cfg.sagemaker.role_name, "[red]unknown[/red]", "-")
        if cfg.mlflow.mode is not MlflowMode.disabled:
            table.add_row(
                "MLflow",
                cfg.effective_mlflow_tracking_server_name or "-",
                "[red]unknown[/red]",
                "-",
            )
        CONSOLE.print(table)
        return

    outputs = stack["outputs"]
    table.add_row("CDK Stack", stack["name"], f"[green]{stack['status']}[/green]", "-")
    table.add_row(
        "S3 Bucket",
        cfg.s3.bucket,
        "[green]managed[/green]",
        outputs.get("DataBucketArn", "-"),
    )
    table.add_row(
        "IAM Role",
        _role_name(cfg.sagemaker.role_name, outputs.get("SageMakerRoleArn", "")),
        "[green]managed[/green]",
        outputs.get("SageMakerRoleArn", "-"),
    )
    if cfg.mlflow.mode is MlflowMode.create:
        table.add_row(
            "MLflow",
            outputs.get("MlflowTrackingServerName", cfg.managed_mlflow_tracking_server_name),
            "[green]managed[/green]",
            outputs.get("MlflowTrackingServerArn", outputs.get("MlflowArtifactUri", "-")),
        )
    elif cfg.mlflow.mode is MlflowMode.existing:
        server = mlflow.describe_tracking_server(
            cfg.aws.region,
            cfg.aws.profile,
            cfg.mlflow.tracking_server_name or "",
        )
        if server is None:
            table.add_row("MLflow", cfg.mlflow.tracking_server_name or "-", "[red]missing[/red]", "-")
        else:
            table.add_row(
                "MLflow",
                cfg.mlflow.tracking_server_name or "-",
                f"[green]{server.get('TrackingServerStatus', 'existing')}[/green]",
                server.get("TrackingServerArn") or server.get("ArtifactStoreUri") or "-",
            )

    CONSOLE.print(table)


@app.command()
def destroy(
    config: str = CONFIG_OPT,
    yes: bool = typer.Option(False, "--yes", "-y", help="Skip confirmation prompt"),
    delete_bucket_data: bool = typer.Option(
        False,
        "--delete-bucket-data",
        help="Delete stack-managed S3 objects and bucket instead of retaining data",
    ),
) -> None:
    """Destroy the CDK stack."""
    cfg = _destroy_config(config)
    stack_name = _destroy_stack_name(config, cfg)
    bootstrap_qualifier = _destroy_bootstrap_qualifier(config, cfg)
    toolkit_stack_name = _destroy_toolkit_stack_name(config, cfg)

    if not yes and not delete_bucket_data:
        typer.confirm(
            f"Destroy CDK stack '{stack_name}' while retaining S3 bucket data?",
            abort=True,
        )

    try:
        account_id = _destroy_account_id(config, cfg)
        with TemporaryDirectory() as temp_dir:
            snapshot_path = Path(temp_dir) / "config.yaml"
            snapshot_path.write_text(yaml.safe_dump(cfg.model_dump(mode="json"), sort_keys=False))
            with CONSOLE.status("Running cdk destroy..."):
                provisioning.destroy(
                    profile=cfg.aws.profile,
                    account_id=account_id,
                    stack_name=stack_name,
                    bootstrap_qualifier=bootstrap_qualifier,
                    toolkit_stack_name=toolkit_stack_name,
                    config_path=str(snapshot_path),
                    delete_bucket_data=delete_bucket_data,
                )
    except RuntimeError as e:
        CONSOLE.print(f"[red]{e}[/red]")
        raise typer.Exit(1)
    CONSOLE.print(f"[green]✓[/green] Destroyed stack: {stack_name}")
    CONSOLE.print(f"[yellow]CDK bootstrap stack retained: {toolkit_stack_name}[/yellow]")


def _destroy_config(config_path: str) -> Config:
    config_dir = str(Path(config_path).parent)
    state = read_infra_state(config_dir)
    config_snapshot = state.get("config")
    if config_snapshot:
        return Config.model_validate(config_snapshot)
    return load_cfg(config_path)


def _role_name(configured_name: str, role_arn: str) -> str:
    if configured_name:
        return configured_name
    if role_arn:
        return role_arn.rsplit("/", 1)[-1]
    return "-"

def _destroy_account_id(config_path: str, cfg: Config) -> str:
    config_dir = str(Path(config_path).parent)
    state = read_infra_state(config_dir)
    account_id = state.get("aws", {}).get("account_id")
    if account_id:
        return str(account_id)
    return identity.account_id(cfg.aws.region, cfg.aws.profile)


def _destroy_stack_name(config_path: str, cfg: Config) -> str:
    config_dir = str(Path(config_path).parent)
    state = read_infra_state(config_dir)
    stack_name = state.get("stack_name")
    if stack_name:
        return str(stack_name)
    return cfg.infra.stack_name


def _destroy_bootstrap_qualifier(config_path: str, cfg: Config) -> str:
    config_dir = str(Path(config_path).parent)
    state = read_infra_state(config_dir)
    bootstrap_qualifier = state.get("bootstrap_qualifier")
    if bootstrap_qualifier:
        return str(bootstrap_qualifier)
    return cfg.infra.effective_bootstrap_qualifier


def _destroy_toolkit_stack_name(config_path: str, cfg: Config) -> str:
    config_dir = str(Path(config_path).parent)
    state = read_infra_state(config_dir)
    toolkit_stack_name = state.get("toolkit_stack_name")
    if toolkit_stack_name:
        return str(toolkit_stack_name)
    return cfg.infra.effective_toolkit_stack_name