"""Public facade shared by the Python SDK and MCP server."""

from __future__ import annotations

from pathlib import Path
from typing import Any

from mcp.server.fastmcp import FastMCP

from pyro_mcp.vm_manager import (
    DEFAULT_ALLOW_HOST_COMPAT,
    DEFAULT_MEM_MIB,
    DEFAULT_TIMEOUT_SECONDS,
    DEFAULT_TTL_SECONDS,
    DEFAULT_VCPU_COUNT,
    VmManager,
)


class Pyro:
    """High-level facade over the ephemeral VM runtime."""

    def __init__(
        self,
        manager: VmManager | None = None,
        *,
        backend_name: str | None = None,
        base_dir: Path | None = None,
        cache_dir: Path | None = None,
        max_active_vms: int = 4,
    ) -> None:
        self._manager = manager or VmManager(
            backend_name=backend_name,
            base_dir=base_dir,
            cache_dir=cache_dir,
            max_active_vms=max_active_vms,
        )

    @property
    def manager(self) -> VmManager:
        return self._manager

    def list_environments(self) -> list[dict[str, object]]:
        return self._manager.list_environments()

    def pull_environment(self, environment: str) -> dict[str, object]:
        return self._manager.pull_environment(environment)

    def inspect_environment(self, environment: str) -> dict[str, object]:
        return self._manager.inspect_environment(environment)

    def prune_environments(self) -> dict[str, object]:
        return self._manager.prune_environments()

    def create_vm(
        self,
        *,
        environment: str,
        vcpu_count: int = DEFAULT_VCPU_COUNT,
        mem_mib: int = DEFAULT_MEM_MIB,
        ttl_seconds: int = DEFAULT_TTL_SECONDS,
        network: bool = False,
        allow_host_compat: bool = DEFAULT_ALLOW_HOST_COMPAT,
    ) -> dict[str, Any]:
        return self._manager.create_vm(
            environment=environment,
            vcpu_count=vcpu_count,
            mem_mib=mem_mib,
            ttl_seconds=ttl_seconds,
            network=network,
            allow_host_compat=allow_host_compat,
        )

    def start_vm(self, vm_id: str) -> dict[str, Any]:
        return self._manager.start_vm(vm_id)

    def exec_vm(self, vm_id: str, *, command: str, timeout_seconds: int = 30) -> dict[str, Any]:
        return self._manager.exec_vm(vm_id, command=command, timeout_seconds=timeout_seconds)

    def stop_vm(self, vm_id: str) -> dict[str, Any]:
        return self._manager.stop_vm(vm_id)

    def delete_vm(self, vm_id: str) -> dict[str, Any]:
        return self._manager.delete_vm(vm_id)

    def status_vm(self, vm_id: str) -> dict[str, Any]:
        return self._manager.status_vm(vm_id)

    def network_info_vm(self, vm_id: str) -> dict[str, Any]:
        return self._manager.network_info_vm(vm_id)

    def reap_expired(self) -> dict[str, Any]:
        return self._manager.reap_expired()

    def run_in_vm(
        self,
        *,
        environment: str,
        command: str,
        vcpu_count: int = DEFAULT_VCPU_COUNT,
        mem_mib: int = DEFAULT_MEM_MIB,
        timeout_seconds: int = DEFAULT_TIMEOUT_SECONDS,
        ttl_seconds: int = DEFAULT_TTL_SECONDS,
        network: bool = False,
        allow_host_compat: bool = DEFAULT_ALLOW_HOST_COMPAT,
    ) -> dict[str, Any]:
        return self._manager.run_vm(
            environment=environment,
            command=command,
            vcpu_count=vcpu_count,
            mem_mib=mem_mib,
            timeout_seconds=timeout_seconds,
            ttl_seconds=ttl_seconds,
            network=network,
            allow_host_compat=allow_host_compat,
        )

    def create_server(self) -> FastMCP:
        server = FastMCP(name="pyro_mcp")

        @server.tool()
        async def vm_run(
            environment: str,
            command: str,
            vcpu_count: int = DEFAULT_VCPU_COUNT,
            mem_mib: int = DEFAULT_MEM_MIB,
            timeout_seconds: int = DEFAULT_TIMEOUT_SECONDS,
            ttl_seconds: int = DEFAULT_TTL_SECONDS,
            network: bool = False,
            allow_host_compat: bool = DEFAULT_ALLOW_HOST_COMPAT,
        ) -> dict[str, Any]:
            """Create, start, execute, and clean up an ephemeral VM."""
            return self.run_in_vm(
                environment=environment,
                command=command,
                vcpu_count=vcpu_count,
                mem_mib=mem_mib,
                timeout_seconds=timeout_seconds,
                ttl_seconds=ttl_seconds,
                network=network,
                allow_host_compat=allow_host_compat,
            )

        @server.tool()
        async def vm_list_environments() -> list[dict[str, object]]:
            """List curated Linux environments and installation status."""
            return self.list_environments()

        @server.tool()
        async def vm_create(
            environment: str,
            vcpu_count: int = DEFAULT_VCPU_COUNT,
            mem_mib: int = DEFAULT_MEM_MIB,
            ttl_seconds: int = DEFAULT_TTL_SECONDS,
            network: bool = False,
            allow_host_compat: bool = DEFAULT_ALLOW_HOST_COMPAT,
        ) -> dict[str, Any]:
            """Create an ephemeral VM record with environment and resource sizing."""
            return self.create_vm(
                environment=environment,
                vcpu_count=vcpu_count,
                mem_mib=mem_mib,
                ttl_seconds=ttl_seconds,
                network=network,
                allow_host_compat=allow_host_compat,
            )

        @server.tool()
        async def vm_start(vm_id: str) -> dict[str, Any]:
            """Start a created VM and transition it into a command-ready state."""
            return self.start_vm(vm_id)

        @server.tool()
        async def vm_exec(vm_id: str, command: str, timeout_seconds: int = 30) -> dict[str, Any]:
            """Run one non-interactive command and auto-clean the VM."""
            return self.exec_vm(vm_id, command=command, timeout_seconds=timeout_seconds)

        @server.tool()
        async def vm_stop(vm_id: str) -> dict[str, Any]:
            """Stop a running VM."""
            return self.stop_vm(vm_id)

        @server.tool()
        async def vm_delete(vm_id: str) -> dict[str, Any]:
            """Delete a VM and its runtime artifacts."""
            return self.delete_vm(vm_id)

        @server.tool()
        async def vm_status(vm_id: str) -> dict[str, Any]:
            """Get the current state and metadata for a VM."""
            return self.status_vm(vm_id)

        @server.tool()
        async def vm_network_info(vm_id: str) -> dict[str, Any]:
            """Get the current network configuration assigned to a VM."""
            return self.network_info_vm(vm_id)

        @server.tool()
        async def vm_reap_expired() -> dict[str, Any]:
            """Delete VMs whose TTL has expired."""
            return self.reap_expired()

        return server