"""Core sandbox establishment logic — harness-agnostic."""

from __future__ import annotations

from sandboxer.extensions.registry import load_extension, resolve_backend
from sandboxer.lifecycle.state_hub import emit_lifecycle_event, event_type_for_state
from sandboxer.lifecycle.store import SandboxStore, utcnow
from sandboxer.models import (
    Reachability,
    SandboxCreateRequest,
    SandboxState,
    SandboxStatus,
)
from sandboxer.placement import resolve_host
from sandboxer.profiles.loader import load_profile


class SandboxManager:
    def __init__(self, store: SandboxStore | None = None) -> None:
        self.store = store or SandboxStore()

    def create(self, request: SandboxCreateRequest, *, host: str | None = None) -> SandboxStatus:
        profile = load_profile(request.profile)
        extension = load_extension(profile.extension)
        backend = resolve_backend(extension)
        resolved_host = resolve_host(profile, override=host)

        now = utcnow()
        status = SandboxStatus(
            sandbox_id="pending",
            profile_id=profile.id,
            extension_id=extension.id,
            state=SandboxState.REQUESTED,
            consumer=request.consumer,
            host=resolved_host,
            inputs=dict(request.inputs),
            created_at=now,
            updated_at=now,
        )
        emit_lifecycle_event(status, event_type=event_type_for_state(status.state))

        status.state = SandboxState.PROVISIONING
        status.updated_at = utcnow()
        emit_lifecycle_event(status, event_type=event_type_for_state(status.state))

        try:
            handle = backend.provision(profile, request.inputs, resolved_host)
            status.sandbox_id = handle["sandbox_id"]
            status.inputs["compose_file"] = handle.get("compose_file", "")
            status.inputs["ssh_user"] = handle.get("ssh_user", "")
            status.inputs["compose_cmd"] = handle.get("compose_cmd", "")
            reach = backend.wait_ready(handle)
            status.reachability = Reachability(**reach)
            status.state = SandboxState.READY
            status.ready_at = utcnow()
            status.updated_at = status.ready_at
            self.store.save(status)
            emit_lifecycle_event(status, event_type=event_type_for_state(status.state))
            return status
        except Exception as exc:
            status.state = SandboxState.FAILED
            status.error = str(exc)
            status.updated_at = utcnow()
            if status.sandbox_id != "pending":
                self.store.save(status)
            emit_lifecycle_event(
                status,
                summary=f"Sandbox provision failed: {exc}",
                event_type=event_type_for_state(status.state),
            )
            raise

    def get(self, sandbox_id: str) -> SandboxStatus | None:
        return self.store.get(sandbox_id)

    def list(self) -> list[SandboxStatus]:
        return sorted(self.store.list_all(), key=lambda s: s.created_at, reverse=True)

    def destroy(self, sandbox_id: str) -> SandboxStatus:
        status = self.store.get(sandbox_id)
        if not status:
            raise KeyError(f"Sandbox not found: {sandbox_id}")
        if status.state == SandboxState.DESTROYED:
            return status

        profile = load_profile(status.profile_id)
        extension = load_extension(profile.extension)
        backend = resolve_backend(extension)

        status.state = SandboxState.DESTROYING
        status.updated_at = utcnow()
        self.store.save(status)
        emit_lifecycle_event(status, event_type=event_type_for_state(status.state))

        handle = {
            "sandbox_id": status.sandbox_id,
            "host": status.host or "",
            "remote_dir": status.reachability.remote_dir if status.reachability else "",
            "compose_project": status.reachability.compose_project if status.reachability else "",
            "compose_file": status.inputs.get("compose_file", ""),
            "ssh_user": status.inputs.get("ssh_user", ""),
            "compose_cmd": status.inputs.get("compose_cmd", ""),
        }
        backend.teardown(handle)

        status.state = SandboxState.DESTROYED
        status.destroyed_at = utcnow()
        status.updated_at = status.destroyed_at
        self.store.save(status)
        emit_lifecycle_event(status, event_type=event_type_for_state(status.state))
        return status

    def recreate(self, sandbox_id: str) -> SandboxStatus:
        existing = self.store.get(sandbox_id)
        if not existing:
            raise KeyError(f"Sandbox not found: {sandbox_id}")
        request = SandboxCreateRequest(
            profile=existing.profile_id,
            inputs=dict(existing.inputs),
            consumer=existing.consumer,
        )
        if existing.state != SandboxState.DESTROYED:
            self.destroy(sandbox_id)
        return self.create(request, host=existing.host)