"""Authenticated, fail-closed HTTP entry points for the conditional WP10 base."""

from __future__ import annotations

import os

from flask import g, jsonify, request

from app.api.system import bp
from app.core.system.permissions import (
    IDENTITY_MANAGE,
    IDENTITY_OPERATE,
    IDENTITY_READ,
    require_permissions,
)
from app.core.system.tenant_control_repository import SqlAlchemyTenantControlRepository
from app.core.system.tenant_control_service import (
    TenantControlError,
    TenantControlService,
)
from app.models.result import failed, success

_MAX_REQUEST_BYTES = 4096
_QUOTA_FIELDS = {"quota_name", "amount", "idempotency_key"}
_LIFECYCLE_FIELDS = {"expected_fence", "idempotency_key", "approval_ref", "backup_digest", "retention_seconds"}
_APPROVAL_FIELDS = {"operation", "expected_fence", "idempotency_key", "backup_digest", "retention_seconds"}


def _service() -> TenantControlService:
    return TenantControlService(SqlAlchemyTenantControlRepository())


def _body(allowed: set[str] = _QUOTA_FIELDS) -> dict:
    if request.content_length is not None and request.content_length > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    if len(request.get_data(cache=True)) > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    value = request.get_json(silent=True)
    if not isinstance(value, dict) or set(value) != allowed:
        raise TenantControlError("tenant_payload_closed")
    return value


def _server_host() -> str:
    # Deliberately never consume a client-supplied tenant field or a forwarded
    # host header.  Trusted proxy normalization belongs in deployment; the
    # persistent DB membership is the final principal+route authorization.
    host = os.environ.get("TRUSTED_TENANT_ROUTE_HOST", "").lower()
    if not host:
        raise TenantControlError("tenant_route_denied")
    return host


@bp.post("/tenant/quota-claims")
@require_permissions(IDENTITY_OPERATE)
def issue_tenant_quota_claim():
    try:
        value = _service().issue_quota_claim(
            principal_id=str(g.current_user["id"]),
            host=_server_host(),
            request=_body(),
        )
        response = jsonify(success(value, code=201))
        response.headers["Cache-Control"] = "no-store"
        return response, 201
    except (KeyError, RuntimeError, TypeError, ValueError, TenantControlError):
        response = jsonify(failed("tenant control request rejected", code=400))
        response.headers["Cache-Control"] = "no-store"
        return response, 400


@bp.post("/tenant/provisions")
@require_permissions(IDENTITY_MANAGE)
def provision_private_tenant():
    try:
        value = _service().provision_private(
            principal_id=str(g.current_user["id"]), host=_server_host(), request=_body_provision()
        )
        response = jsonify(success(value, code=201))
        response.headers["Cache-Control"] = "no-store"
        return response, 201
    except (KeyError, RuntimeError, TypeError, ValueError, TenantControlError):
        response = jsonify(failed("tenant control request rejected", code=400))
        response.headers["Cache-Control"] = "no-store"
        return response, 400


def _body_provision() -> dict:
    return _body({"idempotency_key"})


@bp.post("/tenant/approvals")
@require_permissions(IDENTITY_MANAGE)
def issue_tenant_lifecycle_approval():
    try:
        value = _service().issue_lifecycle_approval(
            reviewer_id=str(g.current_user["id"]), request=_body_approval()
        )
        response = jsonify(success(value, code=201))
        response.headers["Cache-Control"] = "no-store"
        return response, 201
    except (KeyError, RuntimeError, TypeError, ValueError, TenantControlError):
        response = jsonify(failed("tenant approval request rejected", code=400))
        response.headers["Cache-Control"] = "no-store"
        return response, 400


def _body_approval() -> dict:
    if request.content_length is not None and request.content_length > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    if len(request.get_data(cache=True)) > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    value = request.get_json(silent=True)
    if not isinstance(value, dict) or not set(value).issubset(_APPROVAL_FIELDS) or not {"operation", "expected_fence", "idempotency_key"}.issubset(value):
        raise TenantControlError("tenant_payload_closed")
    return value


def _lifecycle(operation: str):
    try:
        value = _service().lifecycle_transition(
            principal_id=str(g.current_user["id"]), host=_server_host(), operation=operation, request=_body_lifecycle()
        )
        response = jsonify(success(value))
        response.headers["Cache-Control"] = "no-store"
        return response, 200
    except (KeyError, RuntimeError, TypeError, ValueError, TenantControlError):
        response = jsonify(failed("tenant lifecycle request rejected", code=400))
        response.headers["Cache-Control"] = "no-store"
        return response, 400


@bp.post("/tenant/lifecycle/activate")
@require_permissions(IDENTITY_MANAGE)
def activate_tenant_lifecycle():
    return _lifecycle("activate")


@bp.post("/tenant/lifecycle/freeze")
@require_permissions(IDENTITY_MANAGE)
def freeze_tenant_lifecycle():
    return _lifecycle("freeze")


@bp.post("/tenant/lifecycle/recover")
@require_permissions(IDENTITY_MANAGE)
def recover_tenant_lifecycle():
    return _lifecycle("begin_recovery")


@bp.post("/tenant/lifecycle/deletion-candidate")
@require_permissions(IDENTITY_MANAGE)
def mark_tenant_deletion_candidate():
    return _lifecycle("mark_deletion_candidate")


@bp.post("/tenant/lifecycle/rollback")
@require_permissions(IDENTITY_MANAGE)
def rollback_tenant_lifecycle():
    return _lifecycle("rollback")


@bp.post("/tenant/lifecycle/delete")
@require_permissions(IDENTITY_MANAGE)
def delete_tenant_lifecycle():
    return _lifecycle("delete")


@bp.get("/tenant/status")
@require_permissions(IDENTITY_READ)
def get_tenant_status():
    return _read("status")


@bp.get("/tenant/audit")
@require_permissions(IDENTITY_READ)
def get_tenant_audit():
    return _read("audit")


@bp.get("/tenant/manifests")
@require_permissions(IDENTITY_READ)
def get_tenant_manifests():
    return _read("manifests")


def _read(kind: str):
    try:
        value = _service().read(principal_id=str(g.current_user["id"]), host=_server_host(), kind=kind)
        response = jsonify(success(value))
        response.headers["Cache-Control"] = "no-store"
        return response, 200
    except (KeyError, RuntimeError, TypeError, ValueError, TenantControlError):
        response = jsonify(failed("tenant read request rejected", code=400))
        response.headers["Cache-Control"] = "no-store"
        return response, 400


def _body_lifecycle() -> dict:
    if request.content_length is not None and request.content_length > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    if len(request.get_data(cache=True)) > _MAX_REQUEST_BYTES:
        raise TenantControlError("tenant_payload_closed")
    value = request.get_json(silent=True)
    if not isinstance(value, dict) or not set(value).issubset(_LIFECYCLE_FIELDS) or not {"expected_fence", "idempotency_key"}.issubset(value):
        raise TenantControlError("tenant_payload_closed")
    return value