#!/usr/bin/env python3
"""Idempotent dev bootstrap: OpenLDAP IdP + OIDC Web app for Gateway (k6 / dev-up).

Writes deploy/zitadel/machinekey/dev-bootstrap.env with:
  ZITADEL_DEFAULT_ORG_ID, ZITADEL_OAUTH_CLIENT_ID, ZITADEL_OAUTH_CLIENT_SECRET,
  ZITADEL_LDAP_IDP_ID, ZITADEL_GOOGLE_IDP_ID (empty)

Requires: ZITADEL up, PAT at deploy/zitadel/machinekey/zitadel-admin-sa.token
"""

from __future__ import annotations

import json
import os
import sys
import urllib.error
import urllib.request
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]
PAT_FILE = ROOT / "deploy/zitadel/machinekey/zitadel-admin-sa.token"
OUT_FILE = ROOT / "deploy/zitadel/machinekey/dev-bootstrap.env"

ZITADEL_BASE = os.environ.get("ZITADEL_BASE", "http://localhost:8080").rstrip("/")

LDAP_IDP_NAME = "GatewayDevLDAP"
PROJECT_NAME = "Gateway"
APP_NAME = "Gateway Backend"
REDIRECT_URIS = [
    "http://localhost:5173/auth/callback/login",
    "http://localhost:5173/auth/callback/register",
]
POST_LOGOUT_URIS = ["http://localhost:5173/"]

LDAP_BODY = {
    "name": LDAP_IDP_NAME,
    "servers": ["ldap://openldap:389"],
    "startTls": False,
    "baseDn": "dc=gateway,dc=local",
    "bindDn": "cn=admin,dc=gateway,dc=local",
    "bindPassword": "admin",
    "userBase": "ou=people,dc=gateway,dc=local",
    "userObjectClasses": ["inetOrgPerson"],
    "userFilters": ["(uid=%s)"],
    "attributes": {
        "idAttribute": "uid",
        "emailAttribute": "mail",
        "firstNameAttribute": "givenName",
        "lastNameAttribute": "sn",
        "displayNameAttribute": "cn",
        "nickNameAttribute": "uid",
    },
    "creationAllowed": True,
    "linkingAllowed": True,
    "autoCreation": True,
    "autoUpdate": True,
}


class BootstrapError(RuntimeError):
    pass


def log(msg: str) -> None:
    print(f"[zitadel-bootstrap] {msg}", file=sys.stderr)


def api(method: str, path: str, body: dict | None = None) -> dict:
    url = f"{ZITADEL_BASE}{path}"
    data = None if body is None else json.dumps(body).encode()
    req = urllib.request.Request(
        url,
        data=data,
        method=method,
        headers={
            "Authorization": f"Bearer {read_pat()}",
            "Content-Type": "application/json",
            "Accept": "application/json",
        },
    )
    try:
        with urllib.request.urlopen(req, timeout=30) as resp:
            raw = resp.read().decode()
            if not raw.strip():
                return {}
            return json.loads(raw)
    except urllib.error.HTTPError as e:
        detail = e.read().decode(errors="replace")
        raise BootstrapError(f"{method} {path} -> HTTP {e.code}: {detail}") from e


def read_pat() -> str:
    if not PAT_FILE.is_file():
        raise BootstrapError(f"PAT missing: {PAT_FILE} (run make k6-wait)")
    pat = PAT_FILE.read_text().strip()
    if not pat:
        raise BootstrapError(f"PAT empty: {PAT_FILE}")
    return pat


def load_saved() -> dict[str, str]:
    if not OUT_FILE.is_file():
        return {}
    out: dict[str, str] = {}
    for line in OUT_FILE.read_text().splitlines():
        line = line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        k, _, v = line.partition("=")
        if k.startswith("export "):
            k = k[len("export ") :]
        out[k.strip()] = v.strip().strip('"').strip("'")
    return out


def write_env(org_id: str, client_id: str, client_secret: str, ldap_idp_id: str) -> None:
    OUT_FILE.parent.mkdir(parents=True, exist_ok=True)
    content = f"""# Auto-generated by deploy/zitadel/bootstrap_dev.py — do not commit
export ZITADEL_DEFAULT_ORG_ID={org_id}
export ZITADEL_OAUTH_CLIENT_ID={client_id}
export ZITADEL_OAUTH_CLIENT_SECRET={client_secret}
export ZITADEL_LDAP_IDP_ID={ldap_idp_id}
export ZITADEL_GOOGLE_IDP_ID=
"""
    OUT_FILE.write_text(content)
    log(f"wrote {OUT_FILE.relative_to(ROOT)}")


def org_id() -> str:
    data = api("GET", "/management/v1/orgs/me")
    oid = (data.get("org") or {}).get("id") or ""
    if not oid:
        raise BootstrapError("could not resolve org id")
    return oid


def login_policy() -> tuple[dict, bool]:
    data = api("GET", "/management/v1/policies/login")
    return data.get("policy") or {}, bool(data.get("isDefault"))


def find_ldap_idp_in_policy(policy: dict) -> str:
    for item in policy.get("idps") or []:
        if item.get("idpName") == LDAP_IDP_NAME:
            return item.get("idpId") or ""
    return ""


def ensure_ldap_idp() -> str:
    policy, is_default = login_policy()
    existing = find_ldap_idp_in_policy(policy)
    if existing:
        log(f"LDAP IdP already linked: {existing}")
        return existing

    created = api("POST", "/management/v1/idps/ldap", LDAP_BODY)
    idp_id = created.get("id") or ""
    if not idp_id:
        raise BootstrapError(f"create LDAP IdP: unexpected response {created}")

    log(f"created LDAP IdP {idp_id}")

    if is_default or not policy.get("allowExternalIdp"):
        api(
            "POST",
            "/management/v1/policies/login",
            {
                "allowExternalIdp": True,
                "allowUsernamePassword": True,
                "allowRegister": True,
                "passwordlessType": "PASSWORDLESS_TYPE_ALLOWED",
                "idps": [{"idpId": idp_id, "ownerType": "IDP_OWNER_TYPE_ORG"}],
            },
        )
        log("created org login policy with LDAP IdP")
    else:
        api("POST", "/management/v1/policies/login/idps", {"idpId": idp_id})
        log("linked LDAP IdP to existing login policy")

    return idp_id


def find_project() -> str:
    data = api(
        "POST",
        "/management/v1/projects/_search",
        {
            "queries": [
                {
                    "nameQuery": {
                        "name": PROJECT_NAME,
                        "method": "TEXT_QUERY_METHOD_EQUALS",
                    }
                }
            ]
        },
    )
    for item in data.get("result") or []:
        if item.get("name") == PROJECT_NAME:
            return item.get("id") or ""
    created = api(
        "POST",
        "/management/v1/projects",
        {
            "name": PROJECT_NAME,
            "projectRoleAssertion": True,
            "projectRoleCheck": False,
            "hasProjectCheck": False,
            "privateLabelingSetting": "PRIVATE_LABELING_SETTING_UNSPECIFIED",
        },
    )
    pid = created.get("id") or ""
    if not pid:
        raise BootstrapError(f"create project: unexpected response {created}")
    log(f"created project {PROJECT_NAME} ({pid})")
    return pid


def find_app(project_id: str) -> tuple[str, str]:
    data = api(
        "POST",
        f"/management/v1/projects/{project_id}/apps/_search",
        {
            "queries": [
                {
                    "nameQuery": {
                        "name": APP_NAME,
                        "method": "TEXT_QUERY_METHOD_EQUALS",
                    }
                }
            ]
        },
    )
    for item in data.get("result") or []:
        if item.get("name") != APP_NAME:
            continue
        app_id = item.get("id") or ""
        client_id = (item.get("oidcConfig") or {}).get("clientId") or ""
        return app_id, client_id
    return "", ""


def create_app(project_id: str) -> tuple[str, str, str]:
    created = api(
        "POST",
        f"/management/v1/projects/{project_id}/apps/oidc",
        {
            "name": APP_NAME,
            "redirectUris": REDIRECT_URIS,
            "responseTypes": ["OIDC_RESPONSE_TYPE_CODE"],
            "grantTypes": [
                "OIDC_GRANT_TYPE_AUTHORIZATION_CODE",
                "OIDC_GRANT_TYPE_REFRESH_TOKEN",
            ],
            "appType": "OIDC_APP_TYPE_WEB",
            "authMethodType": "OIDC_AUTH_METHOD_TYPE_BASIC",
            "postLogoutRedirectUris": POST_LOGOUT_URIS,
            "devMode": True,
            "accessTokenType": "OIDC_TOKEN_TYPE_BEARER",
        },
    )
    app_id = created.get("appId") or ""
    client_id = created.get("clientId") or ""
    client_secret = created.get("clientSecret") or ""
    if not app_id or not client_id or not client_secret:
        raise BootstrapError(f"create OIDC app: unexpected response {created}")
    log(f"created OIDC app {APP_NAME} client_id={client_id}")
    return app_id, client_id, client_secret


def regenerate_secret(project_id: str, app_id: str) -> str:
    data = api(
        "POST",
        f"/management/v1/projects/{project_id}/apps/{app_id}/oidc_config/_generate_client_secret",
        {},
    )
    secret = data.get("clientSecret") or ""
    if not secret:
        raise BootstrapError(f"regenerate client secret: unexpected response {data}")
    log("regenerated OIDC client secret")
    return secret


def ensure_oidc_app(saved: dict[str, str]) -> tuple[str, str]:
    project_id = find_project()
    app_id, client_id = find_app(project_id)
    if not app_id:
        app_id, client_id, client_secret = create_app(project_id)
        return client_id, client_secret

    log(f"OIDC app exists client_id={client_id}")
    saved_id = saved.get("ZITADEL_OAUTH_CLIENT_ID", "")
    saved_secret = saved.get("ZITADEL_OAUTH_CLIENT_SECRET", "")
    if saved_id == client_id and saved_secret:
        return client_id, saved_secret

    return client_id, regenerate_secret(project_id, app_id)


def main() -> int:
    try:
        oid = org_id()
        ldap_idp_id = ensure_ldap_idp()
        saved = load_saved()
        client_id, client_secret = ensure_oidc_app(saved)
        write_env(oid, client_id, client_secret, ldap_idp_id)
        print(f"LDAP IdP={ldap_idp_id} OAuth client={client_id}")
        return 0
    except BootstrapError as e:
        log(f"error: {e}")
        return 1


if __name__ == "__main__":
    raise SystemExit(main())