from kubernetes import client, config
import random, string
from minio_client import generate_password, MINIO_URL, MINIO_CONSOLE_URL
import hashlib

def generate_service_password(username: str, service_type: str) -> str:
    """Génère un password unique par user+service, persistant"""
    seed = f"datalab-{username}-{service_type}-2026"
    return hashlib.sha256(seed.encode()).hexdigest()[:12]

S3_INIT_SCRIPT = (
    "pip install s3contents -q --target=/shared/packages && "
    "mkdir -p /shared/jupyter && "
    "printf '%s\\n' "
    "'import sys' "
    "'sys.path.insert(0, \"/shared/packages\")' "
    "'import os' "
    "'c.ServerApp.contents_manager_class = \"s3contents.S3ContentsManager\"' "
    "'c.S3ContentsManager.endpoint_url = \"https://\" + os.environ.get(\"MINIO_ENDPOINT\", \"\")' "
    "'c.S3ContentsManager.access_key_id = os.environ.get(\"MINIO_ACCESS_KEY\", \"\")' "
    "'c.S3ContentsManager.secret_access_key = os.environ.get(\"MINIO_SECRET_KEY\", \"\")' "
    "'c.S3ContentsManager.bucket = os.environ.get(\"MINIO_BUCKET\", \"\")' "
    "> /shared/jupyter/jupyter_server_config.py && echo OK"
)

S3_START_CMD = (
    "mkdir -p /home/jovyan/.jupyter && "
    "cp /shared/jupyter/jupyter_server_config.py /home/jovyan/.jupyter/ && "
    "export PYTHONPATH=/shared/packages:$PYTHONPATH && "
    "start-notebook.sh"
)


try:
    config.load_incluster_config()
except:
    config.load_kube_config()

DOMAIN = 'lab.leadwire.dev'

def get_namespace(username):
    return f"user-{username}"

def random_id(length=5):
    return ''.join(random.choices(string.digits, k=length))

def ensure_namespace(username):
    v1 = client.CoreV1Api()
    ns = get_namespace(username)
    try:
        v1.read_namespace(ns)
    except:
        v1.create_namespace(client.V1Namespace(
            metadata=client.V1ObjectMeta(
                name=ns,
                labels={"managed-by": "datalab-lite", "user": username}
            )
        ))
    return ns

def create_service(username, service_type, svc_config):
    # Générer password unique par user+service
    service_password = generate_service_password(username, service_type)
    # Remplacer {token} dans les env vars
    resolved_env = {}
    for k, v in svc_config["env"].items():
        resolved_env[k] = v.replace("{token}", service_password)
    svc_config = {**svc_config, "env": resolved_env}
    ns   = ensure_namespace(username)
    uid  = random_id()
    name = f"{username}-{service_type}-{uid}"
    port = svc_config["port"]
    apps = client.AppsV1Api()
    v1   = client.CoreV1Api()
    net  = client.NetworkingV1Api()

    minio_password = generate_password(username)
    minio_envs = {
        "MINIO_ENDPOINT": MINIO_URL,
        "MINIO_ACCESS_KEY": username,
        "MINIO_SECRET_KEY": minio_password,
        "MINIO_BUCKET": f"user-{username}",
        "AWS_ACCESS_KEY_ID": username,
        "AWS_SECRET_ACCESS_KEY": minio_password,
        "AWS_S3_ENDPOINT": f"https://{MINIO_URL}",
        "NB_USER": username,
        "PYTHONPATH": "/home/jovyan/jupyter-packages",
        "PYTHONHTTPSVERIFY": "0",
    }
    env_vars = [client.V1EnvVar(name=k, value=v) for k, v in {**svc_config["env"], **minio_envs}.items()]

    deployment = client.V1Deployment(
        metadata=client.V1ObjectMeta(
            name=name, namespace=ns,
            labels={"app": name, "user": username, "service-type": service_type,
                    "token": svc_config["env"].get("JUPYTER_TOKEN", svc_config["env"].get("PASSWORD", ""))}
        ),
        spec=client.V1DeploymentSpec(
            replicas=1,
            selector=client.V1LabelSelector(match_labels={"app": name}),
            template=client.V1PodTemplateSpec(
                metadata=client.V1ObjectMeta(labels={"app": name}),
                spec=client.V1PodSpec(
                    init_containers=([
                        client.V1Container(
                            name="install-s3",
                            image=svc_config["image"],
                            command=["sh", "-c", S3_INIT_SCRIPT],
                            env=env_vars,
                            volume_mounts=[client.V1VolumeMount(name="shared", mount_path="/shared")]
                        )
                    ] if service_type == "jupyter" else []),
                    containers=[
                        client.V1Container(
                            name=name,
                            image=svc_config["image"],
                            ports=[client.V1ContainerPort(container_port=port)],
                            env=env_vars,
                            command=(["sh", "-c", S3_START_CMD] if service_type == "jupyter" else None),
                            volume_mounts=([client.V1VolumeMount(name="shared", mount_path="/shared")] if service_type == "jupyter" else []),
                            resources=client.V1ResourceRequirements(
                                requests={"memory": "512Mi", "cpu": "250m"},
                                limits={"memory": "2Gi", "cpu": "1"}
                            )
                        )
                    ],
                    volumes=([client.V1Volume(name="shared", empty_dir=client.V1EmptyDirVolumeSource())] if service_type == "jupyter" else [])
                )
            )
        )
    )
    apps.create_namespaced_deployment(ns, deployment)
    svc = client.V1Service(
        metadata=client.V1ObjectMeta(name=name, namespace=ns),
        spec=client.V1ServiceSpec(
            selector={"app": name},
            ports=[client.V1ServicePort(port=port, target_port=port)]
        )
    )
    v1.create_namespaced_service(ns, svc)
    host = f"{name}.{DOMAIN}"
    ingress = client.V1Ingress(
        metadata=client.V1ObjectMeta(
            name=name, namespace=ns,
            annotations={"cert-manager.io/cluster-issuer": "letsencrypt-prod", "nginx.ingress.kubernetes.io/proxy-read-timeout": "3600", "nginx.ingress.kubernetes.io/proxy-send-timeout": "3600"}
        ),
        spec=client.V1IngressSpec(
            ingress_class_name="nginx",
            rules=[client.V1IngressRule(
                host=host,
                http=client.V1HTTPIngressRuleValue(paths=[
                    client.V1HTTPIngressPath(
                        path="/", path_type="Prefix",
                        backend=client.V1IngressBackend(
                            service=client.V1IngressServiceBackend(
                                name=name,
                                port=client.V1ServiceBackendPort(number=port)
                            )
                        )
                    )
                ])
            )],
            tls=[client.V1IngressTLS(hosts=[host], secret_name=f"{name}-tls")]
        )
    )
    net.create_namespaced_ingress(ns, ingress)
    return f"https://{host}"

def delete_service(username, service_name):
    """service_name = nom complet ex: datauser-jupyter-12345"""
    ns = get_namespace(username)
    apps = client.AppsV1Api()
    v1   = client.CoreV1Api()
    net  = client.NetworkingV1Api()
    for fn in [
        lambda: apps.delete_namespaced_deployment(service_name, ns),
        lambda: v1.delete_namespaced_service(service_name, ns),
        lambda: net.delete_namespaced_ingress(service_name, ns),
    ]:
        try: fn()
        except: pass

def list_user_services(username):
    ns = get_namespace(username)
    apps = client.AppsV1Api()
    result = []
    try:
        deps = apps.list_namespaced_deployment(
            ns, label_selector=f"user={username}"
        )
        for d in deps.items:
            stype = d.metadata.labels.get("service-type", "")
            name  = d.metadata.name
            ready = d.status.ready_replicas or 0
            result.append({
                "name":  name,
                "type":  stype,
                "ready": ready > 0,
                "url":   f"https://{name}.{DOMAIN}",
                    "token": d.metadata.labels.get("token", "")
            })
    except:
        pass
    return result