/*
Copyright 2026.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package openbao

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	api "git.ddupan.top/panxiao81/postgresql-tenant-operator/api/v1alpha1"
	bao "github.com/openbao/openbao/api/v2"
)

const testToken = "test-token"
const testAdmin = "admin"

func TestSharedIdentityReauthenticatesOnExpiryAndRevocation(t *testing.T) {
	var logins atomic.Int32
	var revoked atomic.Bool
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/secret/data/admin" {
			http.NotFound(w, r)
			return
		}
		if revoked.Swap(false) {
			w.WriteHeader(http.StatusForbidden)
			return
		}
		if r.Header.Get("X-Vault-Token") != testToken {
			w.WriteHeader(http.StatusForbidden)
			return
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"data": map[string]any{
				"data":     map[string]any{"username": testAdmin, "password": "test-password"},
				"metadata": map[string]any{"version": 1},
			},
		})
	}))
	defer server.Close()
	config := bao.NewConfig()
	config.Address = server.URL
	config.MaxRetries = 0
	client, err := bao.NewClient(config)
	if err != nil {
		t.Fatal(err)
	}
	source := NewCredentials(client, "secret", "kubernetes", "controller")
	source.authenticate = func(context.Context) (*bao.Secret, error) {
		logins.Add(1)
		return &bao.Secret{Auth: &bao.SecretAuth{ClientToken: testToken, LeaseDuration: 300}}, nil
	}
	reference := api.OpenBaoSecretReference{Path: testAdmin}
	var wg sync.WaitGroup
	for range 8 {
		wg.Go(func() {
			if _, err := source.Read(context.Background(), reference); err != nil {
				t.Error(err)
			}
		})
	}
	wg.Wait()
	if logins.Load() != 1 {
		t.Fatal("concurrent reads repeatedly authenticated")
	}
	source.expires = time.Time{}
	if _, err := source.Read(context.Background(), reference); err != nil {
		t.Fatal(err)
	}
	if logins.Load() != 2 {
		t.Fatal("expired identity was not refreshed")
	}
	revoked.Store(true)
	if _, err := source.Read(context.Background(), reference); err != nil {
		t.Fatal(err)
	}
	if logins.Load() != 3 {
		t.Fatal("revoked identity was not refreshed")
	}
}

func TestDeniedPolicyRetriesAuthenticationOnlyOnce(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusForbidden)
	}))
	defer server.Close()
	config := bao.NewConfig()
	config.Address = server.URL
	config.MaxRetries = 0
	client, err := bao.NewClient(config)
	if err != nil {
		t.Fatal(err)
	}
	source := NewCredentials(client, "secret", "kubernetes", "controller")
	logins := 0
	source.authenticate = func(context.Context) (*bao.Secret, error) {
		logins++
		return &bao.Secret{Auth: &bao.SecretAuth{ClientToken: testToken, LeaseDuration: 300}}, nil
	}
	if _, err := source.Read(context.Background(), api.OpenBaoSecretReference{Path: testAdmin}); err == nil {
		t.Fatal("denied policy was accepted")
	}
	if logins != 2 {
		t.Fatal("authentication did not stop after one retry")
	}
}