package app

import (
	"bytes"
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/distributor/internal/config"
	"gitea.maximumdirect.net/eric/distributor/internal/storage"
	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
)

func TestValidateLocalBundle(t *testing.T) {
	var stdout bytes.Buffer
	err := Validate(context.Background(), ValidateOptions{
		Path:   filepath.Join("..", "bundle", "testdata", "valid_bundle"),
		Stdout: &stdout,
	})
	if err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
	if got, want := stdout.String(), "Validated 1 bundle(s)\n"; got != want {
		t.Fatalf("stdout = %q, want %q", got, want)
	}
}

func TestValidateExampleSourceBundle(t *testing.T) {
	err := Validate(context.Background(), ValidateOptions{
		Path: filepath.Join("..", "..", "examples", "source-bundle"),
	})
	if err != nil {
		t.Fatalf("Validate() example error = %v", err)
	}
}

func TestValidateConfiguredLocalSource(t *testing.T) {
	sourceRoot := t.TempDir()
	destinationRoot := t.TempDir()
	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
	var stdout bytes.Buffer

	err := Validate(context.Background(), ValidateOptions{
		ConfigPath: testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
		PipelineID: "reports",
		Stdout:     &stdout,
	})

	if err != nil {
		t.Fatalf("Validate() configured source error = %v", err)
	}
	if got, want := stdout.String(), "Validated 1 bundle(s) for pipeline reports source local\n"; got != want {
		t.Fatalf("stdout = %q, want %q", got, want)
	}
}

func TestValidateConfiguredSourceBundlePath(t *testing.T) {
	sourceRoot := t.TempDir()
	destinationRoot := t.TempDir()
	testutil.WriteSourceBundle(t, sourceRoot, "daily/one", testutil.BundleOptions{ID: "reports.one"})
	testutil.WriteSourceBundle(t, sourceRoot, "daily/two", testutil.BundleOptions{ID: "reports.two"})
	var stdout bytes.Buffer

	err := Validate(context.Background(), ValidateOptions{
		ConfigPath:   testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
		PipelineID:   "reports",
		BundlePath:   "daily/two",
		Stdout:       &stdout,
		OutputFormat: OutputFormatJSON,
	})

	if err != nil {
		t.Fatalf("Validate() configured bundle error = %v", err)
	}
	result := decodeAppResult(t, stdout.String())
	if result["pipeline_id"] != "reports" || result["source_backend"] != "local" || result["bundle_count"] != float64(1) {
		t.Fatalf("result = %#v, want configured source summary", result)
	}
	bundles, ok := result["bundles"].([]any)
	if !ok || len(bundles) != 1 {
		t.Fatalf("bundles = %#v, want one bundle", result["bundles"])
	}
	sourceBundle, ok := bundles[0].(map[string]any)
	if !ok || sourceBundle["path"] != "daily/two" || sourceBundle["id"] != "reports.two" {
		t.Fatalf("bundle = %#v, want narrowed bundle", sourceBundle)
	}
}

func TestValidateConfiguredRemoteSourcesThroughStorageAbstraction(t *testing.T) {
	s3Source := fake.New()
	testutil.WriteFakeSourceBundle(t, s3Source, "", testutil.BundleOptions{ID: "reports.s3"})
	sshSource := fake.New()
	testutil.WriteFakeSourceBundle(t, sshSource, "daily", testutil.BundleOptions{ID: "reports.ssh"})
	cfg := config.Config{Pipelines: []config.Pipeline{
		{
			ID: "s3-reports",
			Source: config.Backend{
				Backend:  config.BackendS3,
				Endpoint: "http://s3.test",
				Bucket:   "source-bucket",
			},
			Destinations: []config.Destination{{
				ID:      "archive",
				Backend: config.BackendLocal,
				Path:    t.TempDir(),
			}},
		},
		{
			ID: "ssh-reports",
			Source: config.Backend{
				Backend: config.BackendSSH,
				Host:    "ssh.test",
				Path:    "/source",
			},
			Destinations: []config.Destination{{
				ID:      "archive",
				Backend: config.BackendLocal,
				Path:    t.TempDir(),
			}},
		},
	}}
	config.ApplyDefaults(&cfg)
	provider := fakeBackendFactoryProvider(t, map[string]storage.Backend{
		"s3:source-bucket": s3Source,
		"ssh:/source":      sshSource,
	})

	var s3Stdout bytes.Buffer
	if err := validateConfigWithBackendFactory(context.Background(), cfg, ValidateOptions{
		PipelineID:   "s3-reports",
		Stdout:       &s3Stdout,
		OutputFormat: OutputFormatJSON,
	}, provider); err != nil {
		t.Fatalf("validate s3 source error = %v", err)
	}
	s3Result := decodeAppResult(t, s3Stdout.String())
	if s3Result["source_backend"] != "s3" || s3Result["bundle_count"] != float64(1) {
		t.Fatalf("s3 result = %#v, want one s3 bundle", s3Result)
	}

	var sshStdout bytes.Buffer
	if err := validateConfigWithBackendFactory(context.Background(), cfg, ValidateOptions{
		PipelineID: "ssh-reports",
		BundlePath: "daily",
		Stdout:     &sshStdout,
	}, provider); err != nil {
		t.Fatalf("validate ssh source error = %v", err)
	}
	if !strings.Contains(sshStdout.String(), "pipeline ssh-reports source ssh") {
		t.Fatalf("ssh stdout = %q, want ssh source summary", sshStdout.String())
	}
}

func TestValidateConfiguredSourceLoadsSecretsBeforeOpeningBackend(t *testing.T) {
	sourceRoot := filepath.Join(t.TempDir(), "missing-source")
	destinationRoot := t.TempDir()
	configPath := writeConfigFile(t, `
secrets:
  directory: `+filepath.Join(t.TempDir(), "missing-secrets")+`
pipelines:
  - id: reports
    source:
      backend: local
      path: `+sourceRoot+`
    destinations:
      - id: archive
        backend: local
        path: `+destinationRoot+`
`)

	err := Validate(context.Background(), ValidateOptions{ConfigPath: configPath, PipelineID: "reports"})
	if err == nil {
		t.Fatal("Validate() error = nil, want secrets directory error")
	}
	if !strings.Contains(err.Error(), "load secrets directory") {
		t.Fatalf("Validate() error = %v, want secrets directory error", err)
	}
	if strings.Contains(err.Error(), "missing-source") {
		t.Fatalf("Validate() error = %v, opened source before loading secrets", err)
	}
}

func TestValidateConfiguredSourcePrintsSecretConflictWarningWithoutValues(t *testing.T) {
	name := "DISTRIBUTOR_TEST_VALIDATE_SECRET"
	t.Setenv(name, "process-value")
	sourceRoot := t.TempDir()
	destinationRoot := t.TempDir()
	secretsRoot := t.TempDir()
	if err := os.WriteFile(filepath.Join(secretsRoot, name), []byte("secret-value\n"), 0o600); err != nil {
		t.Fatalf("write secret: %v", err)
	}
	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
	configPath := writeConfigFile(t, `
secrets:
  directory: `+secretsRoot+`
pipelines:
  - id: reports
    source:
      backend: local
      path: `+sourceRoot+`
    destinations:
      - id: archive
        backend: local
        path: `+destinationRoot+`
`)

	var stdout bytes.Buffer
	err := Validate(context.Background(), ValidateOptions{
		ConfigPath: configPath,
		PipelineID: "reports",
		Stdout:     &stdout,
	})
	if err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
	output := stdout.String()
	if !strings.Contains(output, "secret "+name+" ignored because the real environment already has that variable") {
		t.Fatalf("stdout = %q, want secret conflict warning", output)
	}
	if !strings.Contains(output, "Validated 1 bundle(s) for pipeline reports source local") {
		t.Fatalf("stdout = %q, want validate summary", output)
	}
	if strings.Contains(output, "process-value") || strings.Contains(output, "secret-value") {
		t.Fatalf("stdout exposed secret values: %q", output)
	}
}

func TestValidateConfiguredSourceRequiresPipeline(t *testing.T) {
	sourceRoot := t.TempDir()
	destinationRoot := t.TempDir()
	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})

	err := Validate(context.Background(), ValidateOptions{
		ConfigPath: testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
	})

	if err == nil || !strings.Contains(err.Error(), "requires --pipeline") {
		t.Fatalf("Validate() error = %v, want required pipeline", err)
	}
}

func TestValidateRequiresPath(t *testing.T) {
	err := Validate(context.Background(), ValidateOptions{})
	if err == nil || !strings.Contains(err.Error(), "requires a path") {
		t.Fatalf("Validate() error = %v, want required path", err)
	}
}

func decodeAppResult(t *testing.T, output string) map[string]any {
	t.Helper()
	var envelope map[string]any
	if err := json.Unmarshal([]byte(output), &envelope); err != nil {
		t.Fatalf("decode output: %v; output = %q", err, output)
	}
	result, ok := envelope["result"].(map[string]any)
	if !ok {
		t.Fatalf("result = %#v, want object", envelope["result"])
	}
	return result
}