package app

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/narratio/internal/adapters/storage"
	"gitea.maximumdirect.net/eric/narratio/internal/config"
)

func TestNewCommandObjectStoreLoadsSecretsBeforeFactory(t *testing.T) {
	accessKeyEnv := "NARRATIO_TEST_COMMAND_STORE_KEY_ID"
	secretKeyEnv := "NARRATIO_TEST_COMMAND_STORE_SECRET"
	restoreEnvAfterTest(t, accessKeyEnv, secretKeyEnv)

	secretsDir := t.TempDir()
	mustWriteSecretFile(t, filepath.Join(secretsDir, accessKeyEnv), "loaded-key-id\n")
	mustWriteSecretFile(t, filepath.Join(secretsDir, secretKeyEnv), "loaded-secret\n")

	cfg := commandObjectStoreTestConfig(secretsDir)
	fake := &storage.FakeBackend{}
	called := false
	origStoreFn := newObjectStoreFromConfigFn
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		called = true
		if got := os.Getenv(accessKeyEnv); got != "loaded-key-id" {
			return nil, errors.New("access key was not loaded before object store init")
		}
		if got := os.Getenv(secretKeyEnv); got != "loaded-secret" {
			return nil, errors.New("secret key was not loaded before object store init")
		}
		return fake, nil
	}
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
	})

	store, err := newCommandObjectStore(context.Background(), cfg, nil)
	if err != nil {
		t.Fatalf("newCommandObjectStore() error = %v", err)
	}
	if store != fake {
		t.Fatalf("store = %#v, want fake backend", store)
	}
	if !called {
		t.Fatal("object store factory was not called")
	}
}

func TestNewCommandObjectStorePreservesExistingEnv(t *testing.T) {
	accessKeyEnv := "NARRATIO_TEST_COMMAND_STORE_EXISTING_KEY_ID"
	secretKeyEnv := "NARRATIO_TEST_COMMAND_STORE_EXISTING_SECRET"
	t.Setenv(accessKeyEnv, "existing-key-id")
	t.Setenv(secretKeyEnv, "existing-secret")

	secretsDir := t.TempDir()
	mustWriteSecretFile(t, filepath.Join(secretsDir, accessKeyEnv), "file-key-id\n")
	mustWriteSecretFile(t, filepath.Join(secretsDir, secretKeyEnv), "file-secret\n")

	cfg := commandObjectStoreTestConfig(secretsDir)
	origStoreFn := newObjectStoreFromConfigFn
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		if got := os.Getenv(accessKeyEnv); got != "existing-key-id" {
			return nil, errors.New("existing access key was overwritten")
		}
		if got := os.Getenv(secretKeyEnv); got != "existing-secret" {
			return nil, errors.New("existing secret key was overwritten")
		}
		return &storage.FakeBackend{}, nil
	}
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
	})

	if _, err := newCommandObjectStore(context.Background(), cfg, nil); err != nil {
		t.Fatalf("newCommandObjectStore() error = %v", err)
	}
}

func TestNewCommandObjectStoreSecretErrorStopsFactory(t *testing.T) {
	cfg := commandObjectStoreTestConfig(filepath.Join(t.TempDir(), "missing"))
	called := false
	origStoreFn := newObjectStoreFromConfigFn
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		called = true
		return &storage.FakeBackend{}, nil
	}
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
	})

	_, err := newCommandObjectStore(context.Background(), cfg, nil)
	if err == nil {
		t.Fatal("expected error, got nil")
	}
	if called {
		t.Fatal("object store factory was called after secret load failure")
	}
	if !strings.Contains(err.Error(), "load secrets from files") {
		t.Fatalf("error = %q, want secret loading context", err.Error())
	}
}

func TestNewCommandObjectStoreFactoryErrorIsContextual(t *testing.T) {
	cfg := commandObjectStoreTestConfig("")
	origStoreFn := newObjectStoreFromConfigFn
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		return nil, errors.New("factory boom")
	}
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
	})

	_, err := newCommandObjectStore(context.Background(), cfg, nil)
	if err == nil {
		t.Fatal("expected error, got nil")
	}
	if !strings.Contains(err.Error(), "initialize object store backend") || !strings.Contains(err.Error(), "factory boom") {
		t.Fatalf("error = %q, want factory context", err.Error())
	}
}

func commandObjectStoreTestConfig(secretsDir string) *config.Config {
	cfg := &config.Config{
		Pipeline: &config.PipelineConfig{
			Storage: config.StorageConfig{
				Backend: "s3",
				S3: &config.StorageS3Config{
					Bucket:         "test-bucket",
					AccessKeyIDEnv: "NARRATIO_TEST_COMMAND_STORE_KEY_ID",
					SecretKeyEnv:   "NARRATIO_TEST_COMMAND_STORE_SECRET",
				},
			},
		},
	}
	if strings.TrimSpace(secretsDir) != "" {
		cfg.Pipeline.Secrets = &config.SecretsConfig{EnvDir: secretsDir}
	}
	return cfg
}