package app

import (
	"bytes"
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"

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

func TestExecuteRestoreHelp(t *testing.T) {
	var stdout bytes.Buffer
	var stderr bytes.Buffer

	code := Execute([]string{"session", "restore", "--help"}, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("exit code = %d, want 0", code)
	}
	if stderr.Len() != 0 {
		t.Fatalf("stderr = %q, want empty", stderr.String())
	}
	out := stdout.String()
	if !strings.Contains(out, "Usage: narratio session restore <session_id>") {
		t.Fatalf("stdout = %q, want restore usage", out)
	}
	if !strings.Contains(out, "--include-audio") {
		t.Fatalf("stdout = %q, want --include-audio flag", out)
	}
	if !strings.Contains(out, "--campaign") {
		t.Fatalf("stdout = %q, want --campaign flag", out)
	}
}

func TestExecuteRestoreRecognizedAndReturnsNYI(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	origPlanFn := buildRestorePlanFn
	origExecuteFn := executeRestorePlanFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
		buildRestorePlanFn = origPlanFn
		executeRestorePlanFn = origExecuteFn
	})
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		return &storage.FakeBackend{}, nil
	}
	discoverRemoteCurrentStateFn = func(context.Context, *config.Config, storage.ObjectStore) (*RemoteCurrentState, error) {
		return &RemoteCurrentState{
			SessionID: "2026-05-03",
			Campaign:  "sample-campaign",
			RunID:     "20260519T010203Z-a1b2c3d4",
		}, nil
	}
	buildRestorePlanFn = func(context.Context, *config.Config, *RemoteCurrentState, storage.ObjectStore, RestorePlanOptions) (*RestorePlan, error) {
		return &RestorePlan{
			Actions: []RestoreAction{
				{
					Kind:              RestoreActionDownload,
					LocalRelativePath: "manifest.json",
					RemoteKey:         "dnd/campaigns/sample-campaign/sessions/2026-05-03/current/manifest.json",
					Reason:            "local file missing",
				},
			},
			DownloadCount: 1,
		}, nil
	}

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute(
		[]string{
			"session", "restore", "2026-05-03",
			"--config", pipelinePath,
			"--campaign-file", campaignPath,
			"--session", sessionPath,
			"--dry-run",
			"--force",
			"--include-audio",
		},
		&stdout,
		&stderr,
	)
	if code != 0 {
		t.Fatalf("exit code = %d, want 0 for --dry-run restore planning; stderr=%q", code, stderr.String())
	}
	if stderr.Len() != 0 {
		t.Fatalf("stderr = %q, want empty", stderr.String())
	}
	outText := stdout.String()
	if !strings.Contains(outText, "Restore plan for sample-campaign/2026-05-03") {
		t.Fatalf("stdout = %q, want restore plan summary", outText)
	}
	if !strings.Contains(outText, "Would download: 1") {
		t.Fatalf("stdout = %q, want plan count output", outText)
	}
	if !strings.Contains(outText, "Would download: manifest.json") {
		t.Fatalf("stdout = %q, want action output", outText)
	}

	manifestPath := artifacts.SessionManifestPathForCampaign(workspaceRoot, "sample-campaign", "2026-05-03")
	if _, err := os.Stat(manifestPath); !os.IsNotExist(err) {
		t.Fatalf("manifest should not be created during phase-4 restore planning; stat err=%v", err)
	}
	reportPath := filepath.Join(workspaceRoot, "work", "sample-campaign", "2026-05-03", "reports", "restore-latest.json")
	if _, err := os.Stat(reportPath); !os.IsNotExist(err) {
		t.Fatalf("restore report should not be written during dry-run; stat err=%v", err)
	}
}

func TestExecuteRestoreRejectsUnexpectedPositionalArguments(t *testing.T) {
	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute([]string{"session", "restore", "2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "extra"}, &stdout, &stderr)
	if code == 0 {
		t.Fatal("exit code = 0, want non-zero")
	}
	if !strings.Contains(stderr.String(), "restore: unexpected positional arguments") {
		t.Fatalf("stderr = %q, want positional-args failure", stderr.String())
	}
}

func TestExecuteRestoreFailsWhenStorageBackendNotConfigured(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
	})

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeRestoreConfigWithoutStorage(t, workspaceRoot)

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute([]string{"session", "restore", "2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath}, &stdout, &stderr)
	if code == 0 {
		t.Fatal("exit code = 0, want non-zero")
	}
	if !strings.Contains(stderr.String(), "no remote object store backend is configured") {
		t.Fatalf("stderr = %q, want storage backend preflight failure", stderr.String())
	}
}

func TestExecuteRestoreDiscoveryErrorSurfaced(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
	})
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		return &storage.FakeBackend{}, nil
	}
	discoverRemoteCurrentStateFn = func(context.Context, *config.Config, storage.ObjectStore) (*RemoteCurrentState, error) {
		return nil, fmt.Errorf("remote current run pointer missing: %q", "dnd/campaigns/sample-campaign/sessions/2026-05-03/current/run_id.txt")
	}

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute([]string{"session", "restore", "2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath}, &stdout, &stderr)
	if code == 0 {
		t.Fatal("exit code = 0, want non-zero")
	}
	if !strings.Contains(stderr.String(), "remote current run pointer missing") {
		t.Fatalf("stderr = %q, want discovery error context", stderr.String())
	}
}

func TestExecuteRestoreLoadsSecretsBeforeObjectStoreInit(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	origPlanFn := buildRestorePlanFn
	origExecuteFn := executeRestorePlanFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
		buildRestorePlanFn = origPlanFn
		executeRestorePlanFn = origExecuteFn
	})

	const accessKeyEnv = "OBJECT_STORAGE_KEY_ID"
	const secretKeyEnv = "OBJECT_STORAGE_KEY"
	restoreEnv := func(name string) {
		value, exists := os.LookupEnv(name)
		_ = os.Unsetenv(name)
		t.Cleanup(func() {
			if exists {
				_ = os.Setenv(name, value)
				return
			}
			_ = os.Unsetenv(name)
		})
	}
	restoreEnv(accessKeyEnv)
	restoreEnv(secretKeyEnv)

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
	secretsDir := filepath.Join(t.TempDir(), "secrets")
	mustWriteSecretFile(t, filepath.Join(secretsDir, accessKeyEnv), "test-access-key-id\n")
	mustWriteSecretFile(t, filepath.Join(secretsDir, secretKeyEnv), "test-secret-key\n")
	f, err := os.OpenFile(pipelinePath, os.O_APPEND|os.O_WRONLY, 0)
	if err != nil {
		t.Fatalf("open pipeline config for append: %v", err)
	}
	defer f.Close()
	if _, err := f.WriteString("\nsecrets:\n  env_dir: " + secretsDir + "\n"); err != nil {
		t.Fatalf("append secrets config: %v", err)
	}

	storeInitCalled := false
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		storeInitCalled = true
		gotID, okID := os.LookupEnv(accessKeyEnv)
		if !okID || gotID != "test-access-key-id" {
			return nil, fmt.Errorf("missing or unexpected %s: %q (set=%t)", accessKeyEnv, gotID, okID)
		}
		gotSecret, okSecret := os.LookupEnv(secretKeyEnv)
		if !okSecret || gotSecret != "test-secret-key" {
			return nil, fmt.Errorf("missing or unexpected %s: %q (set=%t)", secretKeyEnv, gotSecret, okSecret)
		}
		return &storage.FakeBackend{}, nil
	}
	discoverRemoteCurrentStateFn = func(context.Context, *config.Config, storage.ObjectStore) (*RemoteCurrentState, error) {
		return &RemoteCurrentState{
			SessionID: "2026-05-03",
			Campaign:  "sample-campaign",
			RunID:     "20260519T010203Z-a1b2c3d4",
		}, nil
	}
	buildRestorePlanFn = func(context.Context, *config.Config, *RemoteCurrentState, storage.ObjectStore, RestorePlanOptions) (*RestorePlan, error) {
		return &RestorePlan{
			Actions: []RestoreAction{
				{
					Kind:              RestoreActionDownload,
					LocalRelativePath: "manifest.json",
					RemoteKey:         "dnd/campaigns/sample-campaign/sessions/2026-05-03/current/manifest.json",
					Reason:            "local file missing",
				},
			},
			DownloadCount: 1,
		}, nil
	}

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute(
		[]string{
			"session", "restore", "2026-05-03",
			"--config", pipelinePath,
			"--campaign-file", campaignPath,
			"--session", sessionPath,
			"--dry-run",
		},
		&stdout,
		&stderr,
	)
	if code != 0 {
		t.Fatalf("exit code = %d, want 0; stderr=%q", code, stderr.String())
	}
	if !storeInitCalled {
		t.Fatal("expected object store initialization to be called")
	}
}

func TestExecuteRestoreNonDryRunConflictFailsBeforeNYI(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	origPlanFn := buildRestorePlanFn
	origExecuteFn := executeRestorePlanFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
		buildRestorePlanFn = origPlanFn
		executeRestorePlanFn = origExecuteFn
	})
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		return &storage.FakeBackend{}, nil
	}
	discoverRemoteCurrentStateFn = func(context.Context, *config.Config, storage.ObjectStore) (*RemoteCurrentState, error) {
		return &RemoteCurrentState{
			SessionID: "2026-05-03",
			Campaign:  "sample-campaign",
			RunID:     "20260519T010203Z-a1b2c3d4",
		}, nil
	}
	buildRestorePlanFn = func(context.Context, *config.Config, *RemoteCurrentState, storage.ObjectStore, RestorePlanOptions) (*RestorePlan, error) {
		return &RestorePlan{
			Actions: []RestoreAction{
				{Kind: RestoreActionConflict, LocalRelativePath: "transcripts/full.json", RemoteKey: "k", Reason: "local file differs"},
			},
			ConflictCount: 1,
		}, nil
	}

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute([]string{"session", "restore", "2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath}, &stdout, &stderr)
	if code == 0 {
		t.Fatal("exit code = 0, want non-zero")
	}
	if stdout.Len() != 0 {
		t.Fatalf("stdout = %q, want empty on conflict failure", stdout.String())
	}
	if !strings.Contains(stderr.String(), "restore conflict: 1 conflicting path(s); rerun with --force to overwrite") {
		t.Fatalf("stderr = %q, want conflict failure", stderr.String())
	}
	if strings.Contains(stderr.String(), "phase 4: restore execution") {
		t.Fatalf("stderr = %q, should fail before phase-4 NYI boundary", stderr.String())
	}
}

func TestExecuteRestoreNonDryRunForceExecutesPlan(t *testing.T) {
	origStoreFn := newObjectStoreFromConfigFn
	origDiscoverFn := discoverRemoteCurrentStateFn
	origPlanFn := buildRestorePlanFn
	origExecuteFn := executeRestorePlanFn
	t.Cleanup(func() {
		newObjectStoreFromConfigFn = origStoreFn
		discoverRemoteCurrentStateFn = origDiscoverFn
		buildRestorePlanFn = origPlanFn
		executeRestorePlanFn = origExecuteFn
	})
	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
		return &storage.FakeBackend{}, nil
	}
	discoverRemoteCurrentStateFn = func(context.Context, *config.Config, storage.ObjectStore) (*RemoteCurrentState, error) {
		return &RemoteCurrentState{
			SessionID: "2026-05-03",
			Campaign:  "sample-campaign",
			RunID:     "20260519T010203Z-a1b2c3d4",
		}, nil
	}
	buildRestorePlanFn = func(context.Context, *config.Config, *RemoteCurrentState, storage.ObjectStore, RestorePlanOptions) (*RestorePlan, error) {
		return &RestorePlan{
			Actions: []RestoreAction{
				{Kind: RestoreActionDownload, LocalRelativePath: "transcripts/full.json", RemoteKey: "k", Reason: "local file differs; overwrite with --force"},
			},
			DownloadCount: 1,
		}, nil
	}
	executeRestorePlanFn = func(context.Context, *config.Config, *RemoteCurrentState, *RestorePlan, *RestoreReport, storage.ObjectStore) (*RestoreExecutionResult, error) {
		return &RestoreExecutionResult{DownloadedCount: 1}, nil
	}

	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Execute([]string{"session", "restore", "2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "--force"}, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("exit code = %d, want 0; stderr=%q", code, stderr.String())
	}
	if !strings.Contains(stdout.String(), "Restored session state for sample-campaign/2026-05-03") {
		t.Fatalf("stdout = %q, want completion summary", stdout.String())
	}
	if stderr.Len() != 0 {
		t.Fatalf("stderr = %q, want empty", stderr.String())
	}
}

func writeRestoreConfigWithoutStorage(t *testing.T, workspaceRoot string) (string, string, string) {
	t.Helper()

	dir := t.TempDir()
	pipelinePath := filepath.Join(dir, "pipeline.yml")
	campaignPath := writeAppTestCampaignConfig(t, dir)
	sessionPath := filepath.Join(dir, "session.yml")

	pipelineYAML := `workspace:
  root: ` + workspaceRoot + `
whisperx:
  transcribe_url: https://example.com/transcribe
`
	sessionYAML := `session_id: 2026-05-03
campaign: sample-campaign
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
  players_file: ./players.yml
  party_file: ./party.yml
`
	if err := os.WriteFile(pipelinePath, []byte(pipelineYAML), 0o644); err != nil {
		t.Fatalf("write pipeline config: %v", err)
	}
	if err := os.WriteFile(sessionPath, []byte(sessionYAML), 0o644); err != nil {
		t.Fatalf("write session config: %v", err)
	}
	mustWriteTestFile(t, filepath.Join(dir, "speakers.yml"), "alice: alice.flac\n")
	mustWriteTestFile(t, filepath.Join(dir, "autocorrect.yml"), "[]\n")
	mustWriteTestFile(t, filepath.Join(dir, "glossary.yml"), "[]\n")
	mustWriteTestFile(t, filepath.Join(dir, "players.yml"), "[]\n")
	mustWriteTestFile(t, filepath.Join(dir, "party.yml"), "[]\n")
	mustWriteTestFile(t, filepath.Join(dir, "audio", "alice.flac"), "audio-bytes")

	return pipelinePath, campaignPath, sessionPath
}