"""Helpers for booting rendered snapshot bundles as temporary compose projects."""

from __future__ import annotations

import time
import subprocess
from dataclasses import dataclass
from pathlib import Path
from typing import Any

from open_range.protocols import ContainerSet


@dataclass(frozen=True, slots=True)
class BootedSnapshotProject:
    """Booted compose project metadata for a rendered child snapshot."""

    project_name: str
    compose_file: Path
    artifacts_dir: Path
    containers: ContainerSet


class ComposeProjectRunner:
    """Boot and tear down rendered snapshot bundles via ``docker compose``."""

    def __init__(
        self,
        *,
        build_timeout_s: float = 300.0,
        up_timeout_s: float = 300.0,
        down_timeout_s: float = 120.0,
        health_timeout_s: float = 120.0,
        health_poll_interval_s: float = 2.0,
        remove_volumes: bool = True,
    ) -> None:
        self.build_timeout_s = build_timeout_s
        self.up_timeout_s = up_timeout_s
        self.down_timeout_s = down_timeout_s
        self.health_timeout_s = health_timeout_s
        self.health_poll_interval_s = health_poll_interval_s
        self.remove_volumes = remove_volumes

    def boot(
        self,
        *,
        snapshot_id: str,
        artifacts_dir: Path,
        compose: dict[str, Any],
        project_name: str | None = None,
    ) -> BootedSnapshotProject:
        compose_file = artifacts_dir / "docker-compose.yml"
        project_name = project_name or self.project_name_for(snapshot_id)

        self._run(
            [
                "docker",
                "compose",
                "-p",
                project_name,
                "-f",
                str(compose_file),
                "build",
            ],
            cwd=artifacts_dir,
            timeout=self.build_timeout_s,
        )
        self._run(
            [
                "docker",
                "compose",
                "-p",
                project_name,
                "-f",
                str(compose_file),
                "up",
                "-d",
            ],
            cwd=artifacts_dir,
            timeout=self.up_timeout_s,
        )

        services = list((compose or {}).get("services", {}).keys())
        container_ids: dict[str, str] = {}
        for service in services:
            result = self._run(
                [
                    "docker",
                    "compose",
                    "-p",
                    project_name,
                    "-f",
                    str(compose_file),
                    "ps",
                    "-q",
                    service,
                ],
                cwd=artifacts_dir,
                timeout=30.0,
            )
            container_id = result.stdout.strip()
            if container_id:
                container_ids[service] = container_id

        project = BootedSnapshotProject(
            project_name=project_name,
            compose_file=compose_file,
            artifacts_dir=artifacts_dir,
            containers=ContainerSet(
                project_name=project_name,
                container_ids=container_ids,
            ),
        )
        self._wait_until_healthy(project, services)
        return project

    def teardown(self, project: BootedSnapshotProject) -> None:
        args = [
            "docker",
            "compose",
            "-p",
            project.project_name,
            "-f",
            str(project.compose_file),
            "down",
        ]
        if self.remove_volumes:
            args.append("-v")
        self._run(
            args,
            cwd=project.artifacts_dir,
            timeout=self.down_timeout_s,
        )

    @staticmethod
    def project_name_for(snapshot_id: str) -> str:
        safe = "".join(ch.lower() if ch.isalnum() else "-" for ch in snapshot_id).strip("-")
        return f"openrange-{safe}"[:63]

    def _wait_until_healthy(
        self,
        project: BootedSnapshotProject,
        services: list[str],
    ) -> None:
        deadline = time.monotonic() + self.health_timeout_s
        pending = list(services)
        while pending and time.monotonic() < deadline:
            still_pending: list[str] = []
            for service in pending:
                try:
                    healthy = _run_async(project.containers.is_healthy(service))
                except Exception:
                    healthy = False
                if not healthy:
                    still_pending.append(service)
            if not still_pending:
                return
            pending = still_pending
            time.sleep(self.health_poll_interval_s)
        if pending:
            raise RuntimeError(
                "Timed out waiting for healthy services: "
                + ", ".join(pending)
            )

    @staticmethod
    def _run(
        args: list[str],
        *,
        cwd: Path,
        timeout: float,
    ) -> subprocess.CompletedProcess[str]:
        result = subprocess.run(
            args,
            cwd=cwd,
            check=False,
            capture_output=True,
            text=True,
            timeout=timeout,
        )
        if result.returncode != 0:
            stderr = result.stderr.strip()
            stdout = result.stdout.strip()
            detail = stderr or stdout or "unknown docker compose failure"
            raise RuntimeError(
                f"{' '.join(args)} failed with exit code {result.returncode}: {detail}"
            )
        return result


def _run_async(coro):
    import asyncio

    return asyncio.run(coro)