from __future__ import annotations

from pathlib import Path
import json
import secrets
import subprocess

from ._services_common import (
    _LogFn,
    _detect_mode,
    _ensure_namespace,
    _exists,
    _kubectl,
    _log,
    _manifest_path,
    _namespace,
    _prune_named_workload_other_namespaces,
    _reconcile_deployment_replicasets,
    _to_bool,
    _wait_rollout,
)


def _opentofu_namespace(namespace: str | None, env: dict | None) -> str:
    if env:
        explicit = str(env.get("OPENTOFU_NAMESPACE") or "").strip()
        if explicit:
            return explicit
    return _namespace(namespace, env, default="default")


def _manifest(project_root: str | Path) -> Path:
    return _manifest_path(project_root, "k8s", "opentofu", "deployment.yaml")


def _build_basic_auth_entry(password: str) -> str:
    pwd = (password or "").strip() or "changeme"
    try:
        res = subprocess.run(
            ["openssl", "passwd", "-apr1", pwd],
            capture_output=True,
            text=True,
            timeout=10,
        )
        if res.returncode == 0:
            hashed = (res.stdout or "").strip()
            if hashed:
                return f"admin:{hashed}"
    except Exception:
        pass
    return f"admin:{{PLAIN}}{pwd}"


def _ensure_admin_secret(
    *,
    namespace: str,
    env: dict | None = None,
    log: _LogFn | None = None,
) -> None:
    force = _to_bool((env or {}).get("PROLE_OPENTOFU_FORCE_SECRET"), default=False)
    if not force and _exists("secret", "opentofu-admin", namespace, env=env):
        return

    admin_password = (
        str((env or {}).get("OPENTOFU_ADMIN_PASSWORD") or "").strip()
        or str((env or {}).get("DB_PASSWORD") or "").strip()
        or secrets.token_urlsafe(18)
    )
    auth_entry = _build_basic_auth_entry(admin_password)

    secret_yaml = (
        "apiVersion: v1\n"
        "kind: Secret\n"
        "metadata:\n"
        "  name: opentofu-admin\n"
        "type: Opaque\n"
        "stringData:\n"
        f"  admin_password: {json.dumps(admin_password)}\n"
        f"  auth: {json.dumps(auth_entry)}\n"
    )
    _kubectl(
        ["-n", namespace, "apply", "-f", "-"],
        env=env,
        input_text=secret_yaml,
        timeout=90,
        check=True,
    )
    _log(log, f"[OPENTOFU] Ensured secret/opentofu-admin in namespace {namespace}")


def _deployment_is_available(
    *,
    deployment: str,
    namespace: str,
    env: dict | None = None,
) -> bool:
    res = _kubectl(
        ["-n", namespace, "get", "deployment", deployment, "-o", "json"],
        env=env,
        timeout=20,
    )
    if res.returncode != 0 or not res.stdout.strip():
        return False
    try:
        payload = json.loads(res.stdout)
    except Exception:
        return False
    spec = payload.get("spec") or {}
    status = payload.get("status") or {}
    desired = int(spec.get("replicas") or 1)
    available = int(status.get("availableReplicas") or 0)
    return desired > 0 and available >= desired


def initialize(
    *,
    namespace: str | None = None,
    env: dict | None = None,
    project_root: str | Path = ".",
    log: _LogFn | None = None,
    mode: str | None = None,
) -> None:
    update(namespace=namespace, env=env, project_root=project_root, log=log, mode=mode)


def start(
    *,
    namespace: str | None = None,
    env: dict | None = None,
    project_root: str | Path = ".",
    log: _LogFn | None = None,
    mode: str | None = None,
) -> None:
    update(namespace=namespace, env=env, project_root=project_root, log=log, mode=mode)


def update(
    *,
    namespace: str | None = None,
    env: dict | None = None,
    project_root: str | Path = ".",
    log: _LogFn | None = None,
    mode: str | None = None,
) -> None:
    _detect_mode(mode, env)  # mode kept for API parity
    target_ns = _opentofu_namespace(namespace, env)
    _ensure_namespace(target_ns, env)
    _ensure_admin_secret(namespace=target_ns, env=env, log=log)
    _prune_named_workload_other_namespaces(
        kind="deployment",
        name="opentofu",
        target_namespace=target_ns,
        label_selector="app=opentofu",
        env=env,
        log=log,
    )
    _prune_named_workload_other_namespaces(
        kind="service",
        name="opentofu",
        target_namespace=target_ns,
        label_selector="app=opentofu",
        env=env,
        log=log,
    )

    force_apply = _to_bool((env or {}).get("PROLE_OPENTOFU_FORCE_APPLY"), default=False)
    if not force_apply and _exists("deployment", "opentofu", target_ns, env=env) and _exists(
        "service", "opentofu", target_ns, env=env
    ):
        _reconcile_deployment_replicasets(
            deployment="opentofu",
            namespace=target_ns,
            label_selector="app=opentofu",
            env=env,
            log=log,
        )
        if _deployment_is_available(deployment="opentofu", namespace=target_ns, env=env):
            _log(
                log,
                f"[OPENTOFU] Healthy deployment already present in namespace {target_ns}; skipping re-apply",
            )
            return
        _log(
            log,
            f"[OPENTOFU] Existing deployment in namespace {target_ns} is not ready; applying manifest for recovery",
        )

    if force_apply:
        _log(
            log,
            f"[OPENTOFU] Force apply enabled; reconciling manifest in namespace {target_ns}",
        )

    manifest = _manifest(project_root)
    if not manifest.exists():
        raise RuntimeError(f"OpenTofu manifest not found: {manifest}")

    _log(log, f"[OPENTOFU] Applying {manifest}")
    _kubectl(
        ["-n", target_ns, "apply", "-f", str(manifest)],
        env=env,
        timeout=240,
        check=True,
    )
    _reconcile_deployment_replicasets(
        deployment="opentofu",
        namespace=target_ns,
        label_selector="app=opentofu",
        env=env,
        log=log,
    )
    _wait_rollout("deployment", "opentofu", target_ns, env=env)


def stop(
    *,
    namespace: str | None = None,
    env: dict | None = None,
    log: _LogFn | None = None,
) -> None:
    target_ns = _opentofu_namespace(namespace, env)
    if _exists("deployment", "opentofu", target_ns, env=env):
        _log(log, f"[OPENTOFU] Scaling deployment/opentofu to 0 in namespace {target_ns}")
        _kubectl(
            ["-n", target_ns, "scale", "deployment/opentofu", "--replicas=0"],
            env=env,
            timeout=90,
            check=True,
        )


def restart(
    *,
    namespace: str | None = None,
    env: dict | None = None,
    log: _LogFn | None = None,
) -> None:
    target_ns = _opentofu_namespace(namespace, env)
    if _exists("deployment", "opentofu", target_ns, env=env):
        _log(log, f"[OPENTOFU] Restarting deployment/opentofu in namespace {target_ns}")
        _kubectl(
            ["-n", target_ns, "rollout", "restart", "deployment/opentofu"],
            env=env,
            timeout=120,
            check=True,
        )
        _wait_rollout("deployment", "opentofu", target_ns, env=env)


def status(
    *,
    namespace: str | None = None,
    env: dict | None = None,
) -> bool:
    target_ns = _opentofu_namespace(namespace, env)
    dep = _kubectl(
        ["-n", target_ns, "get", "deployment", "opentofu", "-o", "jsonpath={.status.readyReplicas}"],
        env=env,
        timeout=20,
    )
    svc = _kubectl(["-n", target_ns, "get", "svc", "opentofu"], env=env, timeout=20)
    return _to_bool(
        dep.returncode == 0 and (dep.stdout or "0").strip() not in {"", "0"} and svc.returncode == 0
    )