"""Tenant-scoped user-management endpoints."""

from __future__ import annotations

from flask import Blueprint, g, jsonify, request
from sqlalchemy.exc import IntegrityError

from ..security.auth import current_actor, require_roles
from ..security.policy import (
    AuthorizationError,
    Role,
    assert_can_manage_llm_settings,
    assert_can_manage_user,
)
from ..services.identity import IdentityRepository
from ..utils.api_errors import ApiError
from ..utils.locale import t


admin_bp = Blueprint("admin", __name__)


@admin_bp.errorhandler(ApiError)
def handle_admin_error(error: ApiError):
    return jsonify(error.to_payload(t)), error.status_code


def _organization_for_request(repo: IdentityRepository, *, payload: dict):
    context = g.auth_context
    actor = current_actor()
    if actor.role is not Role.SUPER_ADMIN:
        return context.organization

    organization_id = payload.get("organization_id") or request.args.get("organization_id")
    organization_slug = payload.get("organization_slug") or request.args.get("organization_slug")
    organization = (
        repo.get_organization(organization_id)
        if isinstance(organization_id, str) and organization_id
        else repo.get_organization_by_slug(organization_slug)
        if isinstance(organization_slug, str) and organization_slug
        else None
    )
    if organization is None:
        raise ApiError("organization_required", 400, "api.organizationRequired")
    return organization


def _serialize_user(user, membership):
    return {
        "id": user.id,
        "email": user.email_normalized,
        "status": user.status,
        "locale": user.locale,
        "role": membership.role.value,
        "created_at": user.created_at.isoformat() if user.created_at else None,
    }


@admin_bp.get("/users")
@require_roles(Role.ADMIN, Role.SUPER_ADMIN)
def list_users():
    repo = IdentityRepository(g.db_session)
    organization = _organization_for_request(repo, payload={})
    rows = repo.list_users_with_memberships(organization.id)
    users = [_serialize_user(user, membership) for user, membership in rows]
    return jsonify({"success": True, "data": {"users": users, "count": len(users)}})


@admin_bp.post("/users")
@require_roles(Role.ADMIN, Role.SUPER_ADMIN)
def create_user():
    payload = request.get_json(silent=True) or {}
    if not isinstance(payload, dict):
        raise ApiError("invalid_request", 400, "api.requestError")
    email = payload.get("email")
    if not isinstance(email, str) or not email.strip():
        raise ApiError("invalid_email", 400, "api.invalidEmail")

    requested_role = payload.get("role", Role.USER.value)
    try:
        role = requested_role if isinstance(requested_role, Role) else Role(requested_role)
    except (TypeError, ValueError) as exc:
        raise ApiError("invalid_role", 400, "api.invalidRole") from exc

    repo = IdentityRepository(g.db_session)
    organization = _organization_for_request(repo, payload=payload)
    actor = current_actor()
    try:
        assert_can_manage_user(
            actor,
            target_organization_id=organization.id,
            target_role=role,
            platform_scope=actor.role is Role.SUPER_ADMIN,
        )
    except AuthorizationError as exc:
        raise ApiError(exc.code, 403, "common.error") from exc

    try:
        user = repo.create_user(email=email)
        membership = repo.create_membership(user.id, organization.id, role)
    except IntegrityError as exc:
        raise ApiError("user_exists", 409, "api.userExists") from exc
    except ValueError as exc:
        code = str(exc)
        if code == "invalid_email":
            raise ApiError("invalid_email", 400, "api.invalidEmail") from exc
        raise ApiError("user_creation_failed", 400, "api.requestError") from exc

    return jsonify({
        "success": True,
        "data": _serialize_user(user, membership),
    }), 201


@admin_bp.patch("/users/<user_id>")
@require_roles(Role.ADMIN, Role.SUPER_ADMIN)
def update_user(user_id: str):
    """Update a user's membership role (and optionally status) in the org."""
    payload = request.get_json(silent=True) or {}
    if not isinstance(payload, dict):
        raise ApiError("invalid_request", 400, "api.requestError")

    repo = IdentityRepository(g.db_session)
    organization = _organization_for_request(repo, payload=payload)
    actor = current_actor()

    target_user = None
    target_membership = None
    for user, membership in repo.list_users_with_memberships(organization.id):
        if user.id == user_id:
            target_user = user
            target_membership = membership
            break
    if target_user is None or target_membership is None:
        raise ApiError("user_not_found", 404, "api.userNotFound")

    # Role change (if provided).
    if "role" in payload:
        requested_role = payload["role"]
        try:
            new_role = requested_role if isinstance(requested_role, Role) else Role(requested_role)
        except (TypeError, ValueError) as exc:
            raise ApiError("invalid_role", 400, "api.invalidRole") from exc
        try:
            assert_can_manage_user(
                actor,
                target_organization_id=organization.id,
                target_role=new_role,
                platform_scope=actor.role is Role.SUPER_ADMIN,
            )
        except AuthorizationError as exc:
            raise ApiError(exc.code, 403, "common.error") from exc
        target_membership.role = new_role if isinstance(new_role, Role) else Role(new_role)

    # Status change (if provided); only super_admin may do so (safety).
    if "status" in payload:
        status = payload["status"]
        if status not in ("active", "disabled"):
            raise ApiError("invalid_status", 400, "api.invalidRequest")
        if actor.role is not Role.SUPER_ADMIN:
            raise ApiError("admin_status_change_forbidden", 403, "common.error")
        target_user.status = status

    g.db_session.commit()
    return jsonify({
        "success": True,
        "data": _serialize_user(target_user, target_membership),
    })


def _require_platform_settings_access():
    actor = current_actor()
    try:
        assert_can_manage_llm_settings(actor, platform_scope=True)
    except AuthorizationError as exc:
        raise ApiError(exc.code, 403, "common.error") from exc
    return actor


@admin_bp.get("/settings")
@require_roles(Role.SUPER_ADMIN)
def get_settings():
    """Return the active (masked) platform LLM settings for a super admin."""
    from ..services.settings_service import SettingsService

    _require_platform_settings_access()
    svc = SettingsService(g.db_session)
    return jsonify({"success": True, "data": svc.active_settings()})


@admin_bp.put("/settings")
@require_roles(Role.SUPER_ADMIN)
def update_settings():
    """Persist a new version of platform LLM settings (super admin only)."""
    from ..services.settings_service import SettingsService

    actor = _require_platform_settings_access()
    payload = request.get_json(silent=True) or {}
    if not isinstance(payload, dict):
        raise ApiError("invalid_request", 400, "api.requestError")

    settings_fields = {
        "provider": payload.get("provider"),
        "model": payload.get("model"),
        "base_url": payload.get("base_url"),
    }
    settings = {k: v for k, v in settings_fields.items() if isinstance(v, str) and v}
    if payload.get("api_key"):
        api_key = payload["api_key"]
        if not isinstance(api_key, str) or not api_key.strip():
            raise ApiError("invalid_api_key", 400, "api.invalidRequest")
    else:
        api_key = None

    svc = SettingsService(g.db_session)
    version = svc.save_settings(
        settings,
        api_key=api_key,
        updated_by=actor.user_id,
    )
    g.db_session.commit()
    return jsonify({"success": True, "data": svc.active_settings()})