"""Consolidated bottle launch sequence for the docker backend (PRD 0070).

Composes the orchestrator primitives into the register/teardown sequence:

  1. ensure the per-host pair (orchestrator + gateway containers) is up;
  2. allocate the bottle a pinned source IP on the gateway network;
  3. register it and provision its git-gate repos/creds into the gateway.

Returns a `LaunchContext` with everything the agent container needs to
attach. The agent `docker run` itself is the backend's job; this owns the
orchestrator-facing wiring so that sequence stays testable in isolation.
"""

from __future__ import annotations

import tempfile
from dataclasses import dataclass

from ... import log
from .util import run_docker
from ...egress import EgressPlan
from ...git_gate import GitGatePlan
from ...orchestrator.client import OrchestratorClient
from ...gateway import GATEWAY_NETWORK
from .infra import INFRA_NAME, DockerInfraService
from ...orchestrator.store.secret_store import ENV_VAR_SECRET_NAME
from ...orchestrator.reprovision import reprovision_bottles
from ..base import InfraLaunchError
from ..provision_bottle import deprovision_bottle, provision_bottle
from ..util import AGENT_CA_PATH
from .gateway_transport import DockerGatewayTransport
from .gateway_net import next_free_ip


@dataclass(frozen=True)
class LaunchContext:
    """What the agent container needs to join the shared gateway."""

    bottle_id: str
    identity_token: str
    source_ip: str          # the agent's pinned address (attribution key)
    network: str            # the shared gateway network to attach to
    gateway_ip: str         # the gateway's address — the agent's proxy target
    orchestrator_url: str
    env_var_secret: str = ""  # encryption key injected into the agent's env


def _network_cidr(network: str) -> str:
    """The gateway network's IPv4 subnet, or raise."""
    proc = run_docker([
        "docker", "network", "inspect",
        "--format", "{{range .IPAM.Config}}{{.Subnet}}{{end}}", network,
    ])
    cidr = proc.stdout.strip()
    if proc.returncode != 0 or not cidr:
        raise InfraLaunchError(
            f"gateway network {network} has no subnet: {proc.stderr.strip()}"
        )
    return cidr


def _network_container_ips(network: str) -> list[str]:
    """Every address currently assigned on the gateway network — the ground
    truth for "in use": the gateway container and every live agent. Read from
    the network so a new bottle can't collide with anything actually attached."""
    proc = run_docker([
        "docker", "network", "inspect", "--format",
        "{{range .Containers}}{{.IPv4Address}} {{end}}", network,
    ])
    if proc.returncode != 0:
        detail = proc.stderr.strip() or f"exit {proc.returncode}"
        raise InfraLaunchError(
            f"could not inspect addresses on gateway network {network}: {detail}"
        )
    ips: list[str] = []
    for entry in proc.stdout.split():
        ips.append(entry.split("/", 1)[0])
    return ips


def running_agent_containers(
    network: str = GATEWAY_NETWORK, gateway_name: str = INFRA_NAME,
) -> list[str]:
    """Every running agent container on the gateway `network` (the gateway
    itself excluded) — the bottles the bring-up reconcile attaches to the fresh
    gateway (PRD 0081). Raises `OSError` if `docker` can't be run (fail hard: a
    reconcile that can't list its bottles must not look like "no bottles")."""
    proc = run_docker([
        "docker", "network", "inspect", "--format",
        "{{range .Containers}}{{.Name}}\n{{end}}", network,
    ])
    return [
        name for name in (line.strip() for line in proc.stdout.splitlines())
        if name and name != gateway_name
    ]


def push_ca_to_container(container: str, ca_pem: str) -> None:
    """(Re)attach one running agent container to the current gateway: replace
    its trusted gateway CA with `ca_pem` and rebuild its trust store via
    `docker cp` + `docker exec` (PRD 0081). Unconditional install — there is one
    gateway, so no fingerprint match is needed.

    Fail hard: raises `InfraLaunchError` (naming the container) on any failure —
    the base reconcile aggregates and surfaces it rather than leaving the agent
    silently unable to reach the gateway."""
    mkdir = run_docker(
        ["docker", "exec", container, "mkdir", "-p",
         "/usr/local/share/ca-certificates"]
    )
    if mkdir.returncode != 0:
        raise InfraLaunchError(
            f"CA push to {container} failed (mkdir): {mkdir.stderr.strip()}"
        )
    with tempfile.NamedTemporaryFile("w", suffix=".crt") as tmp:
        tmp.write(ca_pem)
        tmp.flush()
        cp = run_docker(["docker", "cp", tmp.name, f"{container}:{AGENT_CA_PATH}"])
    if cp.returncode != 0:
        raise InfraLaunchError(
            f"CA push to {container} failed (cp): {cp.stderr.strip()}"
        )
    ex = run_docker(
        ["docker", "exec", container, "sh", "-c",
         f"chmod 644 {AGENT_CA_PATH} && update-ca-certificates"]
    )
    if ex.returncode != 0:
        raise InfraLaunchError(
            f"CA push to {container} failed (update-ca-certificates): "
            f"{ex.stderr.strip()}"
        )


def _reprovision_running_bottles(
    orchestrator_url: str,
    network: str = GATEWAY_NETWORK,
    infra_name: str = INFRA_NAME,
) -> None:
    """Re-inject egress tokens for any registered bottles that lost their
    in-memory tokens (e.g., after an orchestrator restart).

    For each registered bottle whose source IP maps to a live container on the
    gateway network, reads ENV_VAR_SECRET via ``docker exec … printenv`` and
    calls ``POST /bottles/<id>/reprovision_gateway``. Idempotent — a no-op
    when the orchestrator already has all tokens loaded. Best-effort: a single
    container exec failure never blocks a new bottle launch."""
    client = OrchestratorClient(orchestrator_url)
    # Build {source_ip: container_name} from live containers on the gateway
    # network, excluding the gateway container itself.
    try:
        proc = run_docker([
            "docker", "network", "inspect",
            "--format", "{{range .Containers}}{{.Name}} {{.IPv4Address}}\n{{end}}",
            network,
        ])
    except OSError as exc:
        log.info(f"egress token reprovision skipped: {exc}")
        return
    ip_to_container: dict[str, str] = {}
    for line in proc.stdout.splitlines():
        parts = line.strip().split()
        if len(parts) >= 2 and parts[0] != infra_name:
            ip = parts[1].split("/", 1)[0]
            if ip:
                ip_to_container[ip] = parts[0]

    secrets_by_ip: dict[str, str] = {}
    for source_ip, container_name in ip_to_container.items():
        proc = run_docker(
            ["docker", "exec", container_name, "printenv", ENV_VAR_SECRET_NAME]
        )
        if proc.returncode == 0 and proc.stdout.strip():
            secrets_by_ip[source_ip] = proc.stdout.strip()

    reprovisioned = reprovision_bottles(client, secrets_by_ip)
    if reprovisioned:
        log.info(
            "reprovisioned egress tokens",
            context={"count": reprovisioned},
        )


def launch_consolidated(
    egress_plan: EgressPlan,
    git_gate_plan: GitGatePlan,
    *,
    image_ref: str = "",
    tokens: dict[str, str] | None = None,
    service: DockerInfraService | None = None,
    infra_name: str = INFRA_NAME,
    network: str = GATEWAY_NETWORK,
) -> LaunchContext:
    """Ensure the orchestrator + gateway pair is up, allocate + register the bottle, and
    provision its git-gate state. Returns the agent's attach context.

    Also reprovisiones egress tokens for any already-running bottles that lost
    their in-memory credentials (e.g. after an orchestrator restart), so
    they regain egress access before the new bottle is registered."""
    service = service or DockerInfraService()
    url = service.ensure_running()
    # Agents attribute against the *gateway* container (data plane), not the
    # orchestrator — the two planes are now separate containers. Read its
    # agent-facing address + provisioning transport off the Gateway service.
    gateway = service.gateway()
    _reprovision_running_bottles(url, network=network, infra_name=gateway.name)
    client = OrchestratorClient(url)

    cidr = _network_cidr(network)
    gateway_ip = gateway.address()
    source_ip = next_free_ip(cidr, _network_container_ips(network))

    transport = gateway.provisioning_transport()
    reg = provision_bottle(
        client, source_ip, egress_plan, git_gate_plan, transport,
        image_ref=image_ref, tokens=tokens,
    )
    return LaunchContext(
        bottle_id=reg.bottle_id,
        identity_token=reg.identity_token,
        source_ip=source_ip,
        network=network,
        gateway_ip=gateway_ip,
        orchestrator_url=url,
        env_var_secret=reg.env_var_secret,
    )


def deprovision_consolidated(
    bottle_id: str, *, orchestrator_url: str, infra_name: str = INFRA_NAME,
    timeout: float | None = None,
) -> None:
    """Deregister the bottle and remove its git-gate state. Idempotent."""
    deprovision_bottle(bottle_id, DockerGatewayTransport(infra_name),
                   orchestrator_url=orchestrator_url, timeout=timeout)


__all__ = [
    "LaunchContext",
    "launch_consolidated",
    "running_agent_containers",
    "push_ca_to_container",
    "deprovision_consolidated",
    "InfraLaunchError",
]