package auth

import (
	"encoding/json"
	"os"
	"path/filepath"
	"runtime"
	"testing"
	"time"

	"github.com/sipeed/picoclaw/pkg/config"
)

func setTestAuthHome(t *testing.T) string {
	t.Helper()

	tmpDir := t.TempDir()
	t.Setenv(config.EnvHome, filepath.Join(tmpDir, ".picoclaw"))
	return tmpDir
}

func TestAuthCredentialIsExpired(t *testing.T) {
	tests := []struct {
		name      string
		expiresAt time.Time
		want      bool
	}{
		{"zero time", time.Time{}, false},
		{"future", time.Now().Add(time.Hour), false},
		{"past", time.Now().Add(-time.Hour), true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &AuthCredential{ExpiresAt: tt.expiresAt}
			if got := c.IsExpired(); got != tt.want {
				t.Errorf("IsExpired() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestAuthCredentialNeedsRefresh(t *testing.T) {
	tests := []struct {
		name      string
		expiresAt time.Time
		want      bool
	}{
		{"zero time", time.Time{}, false},
		{"far future", time.Now().Add(time.Hour), false},
		{"within 5 min", time.Now().Add(3 * time.Minute), true},
		{"already expired", time.Now().Add(-time.Minute), true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &AuthCredential{ExpiresAt: tt.expiresAt}
			if got := c.NeedsRefresh(); got != tt.want {
				t.Errorf("NeedsRefresh() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestStoreRoundtrip(t *testing.T) {
	setTestAuthHome(t)

	cred := &AuthCredential{
		AccessToken:  "test-access-token",
		RefreshToken: "test-refresh-token",
		AccountID:    "acct-123",
		ExpiresAt:    time.Now().Add(time.Hour).Truncate(time.Second),
		Provider:     "openai",
		AuthMethod:   "oauth",
	}

	if err := SetCredential("openai", cred); err != nil {
		t.Fatalf("SetCredential() error: %v", err)
	}

	loaded, err := GetCredential("openai")
	if err != nil {
		t.Fatalf("GetCredential() error: %v", err)
	}
	if loaded == nil {
		t.Fatal("GetCredential() returned nil")
	}
	if loaded.AccessToken != cred.AccessToken {
		t.Errorf("AccessToken = %q, want %q", loaded.AccessToken, cred.AccessToken)
	}
	if loaded.RefreshToken != cred.RefreshToken {
		t.Errorf("RefreshToken = %q, want %q", loaded.RefreshToken, cred.RefreshToken)
	}
	if loaded.Provider != cred.Provider {
		t.Errorf("Provider = %q, want %q", loaded.Provider, cred.Provider)
	}
}

func TestStoreFilePermissions(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	cred := &AuthCredential{
		AccessToken: "secret-token",
		Provider:    "openai",
		AuthMethod:  "oauth",
	}
	if err := SetCredential("openai", cred); err != nil {
		t.Fatalf("SetCredential() error: %v", err)
	}

	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	info, err := os.Stat(path)
	if err != nil {
		t.Fatalf("Stat() error: %v", err)
	}
	perm := info.Mode().Perm()
	if runtime.GOOS == "windows" {
		return
	}
	if perm != 0o600 {
		t.Errorf("file permissions = %o, want 0600", perm)
	}
}

func TestStoreMultiProvider(t *testing.T) {
	setTestAuthHome(t)

	openaiCred := &AuthCredential{AccessToken: "openai-token", Provider: "openai", AuthMethod: "oauth"}
	anthropicCred := &AuthCredential{AccessToken: "anthropic-token", Provider: "anthropic", AuthMethod: "token"}

	if err := SetCredential("openai", openaiCred); err != nil {
		t.Fatalf("SetCredential(openai) error: %v", err)
	}
	if err := SetCredential("anthropic", anthropicCred); err != nil {
		t.Fatalf("SetCredential(anthropic) error: %v", err)
	}

	loaded, err := GetCredential("openai")
	if err != nil {
		t.Fatalf("GetCredential(openai) error: %v", err)
	}
	if loaded.AccessToken != "openai-token" {
		t.Errorf("openai token = %q, want %q", loaded.AccessToken, "openai-token")
	}

	loaded, err = GetCredential("anthropic")
	if err != nil {
		t.Fatalf("GetCredential(anthropic) error: %v", err)
	}
	if loaded.AccessToken != "anthropic-token" {
		t.Errorf("anthropic token = %q, want %q", loaded.AccessToken, "anthropic-token")
	}
}

func TestDeleteCredential(t *testing.T) {
	setTestAuthHome(t)

	cred := &AuthCredential{AccessToken: "to-delete", Provider: "openai", AuthMethod: "oauth"}
	if err := SetCredential("openai", cred); err != nil {
		t.Fatalf("SetCredential() error: %v", err)
	}

	if err := DeleteCredential("openai"); err != nil {
		t.Fatalf("DeleteCredential() error: %v", err)
	}

	loaded, err := GetCredential("openai")
	if err != nil {
		t.Fatalf("GetCredential() error: %v", err)
	}
	if loaded != nil {
		t.Error("expected nil after delete")
	}
}

func TestLoadStoreEmpty(t *testing.T) {
	setTestAuthHome(t)

	store, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if store == nil {
		t.Fatal("LoadStore() returned nil")
	}
	if len(store.Credentials) != 0 {
		t.Errorf("expected empty credentials, got %d", len(store.Credentials))
	}
}

func TestGetCredentialCanonicalizesLegacyAntigravityProvider(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	expiresAt := time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC)
	store := map[string]any{
		"credentials": map[string]any{
			"antigravity": map[string]any{
				"access_token": "legacy-token",
				"expires_at":   expiresAt.Format(time.RFC3339),
				"provider":     "antigravity",
				"auth_method":  "oauth",
				"project_id":   "project-1",
			},
		},
	}
	data, err := json.Marshal(store)
	if err != nil {
		t.Fatalf("json.Marshal() error: %v", err)
	}
	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	err = os.MkdirAll(filepath.Dir(path), 0o755)
	if err != nil {
		t.Fatalf("MkdirAll() error: %v", err)
	}
	err = os.WriteFile(path, data, 0o600)
	if err != nil {
		t.Fatalf("WriteFile() error: %v", err)
	}

	cred, err := GetCredential("google-antigravity")
	if err != nil {
		t.Fatalf("GetCredential() error: %v", err)
	}
	if cred == nil {
		t.Fatal("GetCredential() returned nil")
	}
	if cred.Provider != "google-antigravity" {
		t.Fatalf("Provider = %q, want %q", cred.Provider, "google-antigravity")
	}
	if !cred.ExpiresAt.Equal(expiresAt) {
		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, expiresAt)
	}
}

func TestLoadStoreMergesAntigravityAliasesPreferringNewerExpiry(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	legacyExpiry := time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC)
	refreshedExpiry := time.Date(2026, 4, 16, 12, 0, 0, 0, time.UTC)
	store := map[string]any{
		"credentials": map[string]any{
			"antigravity": map[string]any{
				"access_token":  "legacy-token",
				"refresh_token": "legacy-refresh",
				"expires_at":    legacyExpiry.Format(time.RFC3339),
				"provider":      "antigravity",
				"auth_method":   "oauth",
				"email":         "legacy@example.com",
			},
			"google-antigravity": map[string]any{
				"access_token": "fresh-token",
				"expires_at":   refreshedExpiry.Format(time.RFC3339),
				"provider":     "google-antigravity",
				"auth_method":  "oauth",
				"project_id":   "project-2",
			},
		},
	}
	data, err := json.Marshal(store)
	if err != nil {
		t.Fatalf("json.Marshal() error: %v", err)
	}
	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	err = os.MkdirAll(filepath.Dir(path), 0o755)
	if err != nil {
		t.Fatalf("MkdirAll() error: %v", err)
	}
	err = os.WriteFile(path, data, 0o600)
	if err != nil {
		t.Fatalf("WriteFile() error: %v", err)
	}

	loaded, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if len(loaded.Credentials) != 1 {
		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
	}

	cred := loaded.Credentials["google-antigravity"]
	if cred == nil {
		t.Fatal("google-antigravity credential missing")
	}
	if cred.AccessToken != "fresh-token" {
		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
	}
	if cred.RefreshToken != "legacy-refresh" {
		t.Fatalf("RefreshToken = %q, want %q", cred.RefreshToken, "legacy-refresh")
	}
	if cred.Email != "legacy@example.com" {
		t.Fatalf("Email = %q, want %q", cred.Email, "legacy@example.com")
	}
	if cred.ProjectID != "project-2" {
		t.Fatalf("ProjectID = %q, want %q", cred.ProjectID, "project-2")
	}
	if !cred.ExpiresAt.Equal(refreshedExpiry) {
		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, refreshedExpiry)
	}
}

func TestLoadStorePrefersCanonicalKeyWhenExpiryMatchesAlias(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	expiresAt := time.Date(2026, 4, 16, 12, 0, 0, 0, time.UTC)
	store := map[string]any{
		"credentials": map[string]any{
			"antigravity": map[string]any{
				"access_token":  "legacy-token",
				"refresh_token": "legacy-refresh",
				"expires_at":    expiresAt.Format(time.RFC3339),
				"provider":      "antigravity",
				"auth_method":   "oauth",
				"email":         "legacy@example.com",
			},
			" Google-Antigravity ": map[string]any{
				"access_token": "fresh-token",
				"expires_at":   expiresAt.Format(time.RFC3339),
				"provider":     " Google-Antigravity ",
				"auth_method":  "oauth",
				"project_id":   "project-2",
			},
		},
	}
	data, err := json.Marshal(store)
	if err != nil {
		t.Fatalf("json.Marshal() error: %v", err)
	}
	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	err = os.MkdirAll(filepath.Dir(path), 0o755)
	if err != nil {
		t.Fatalf("MkdirAll() error: %v", err)
	}
	err = os.WriteFile(path, data, 0o600)
	if err != nil {
		t.Fatalf("WriteFile() error: %v", err)
	}

	loaded, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if len(loaded.Credentials) != 1 {
		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
	}

	cred := loaded.Credentials["google-antigravity"]
	if cred == nil {
		t.Fatal("google-antigravity credential missing")
	}
	if cred.AccessToken != "fresh-token" {
		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
	}
	if cred.RefreshToken != "legacy-refresh" {
		t.Fatalf("RefreshToken = %q, want %q", cred.RefreshToken, "legacy-refresh")
	}
	if cred.Email != "legacy@example.com" {
		t.Fatalf("Email = %q, want %q", cred.Email, "legacy@example.com")
	}
	if cred.ProjectID != "project-2" {
		t.Fatalf("ProjectID = %q, want %q", cred.ProjectID, "project-2")
	}
}

func TestSetCredentialReplacesLegacyAntigravityEntry(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	legacyStore := map[string]any{
		"credentials": map[string]any{
			"antigravity": map[string]any{
				"access_token": "legacy-token",
				"expires_at":   time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC).Format(time.RFC3339),
				"provider":     "antigravity",
				"auth_method":  "oauth",
			},
		},
	}
	data, err := json.Marshal(legacyStore)
	if err != nil {
		t.Fatalf("json.Marshal() error: %v", err)
	}
	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	err = os.MkdirAll(filepath.Dir(path), 0o755)
	if err != nil {
		t.Fatalf("MkdirAll() error: %v", err)
	}
	err = os.WriteFile(path, data, 0o600)
	if err != nil {
		t.Fatalf("WriteFile() error: %v", err)
	}

	refreshedExpiry := time.Date(2026, 4, 16, 12, 30, 0, 0, time.UTC)
	err = SetCredential("google-antigravity", &AuthCredential{
		AccessToken: "fresh-token",
		ExpiresAt:   refreshedExpiry,
		Provider:    "google-antigravity",
		AuthMethod:  "oauth",
	})
	if err != nil {
		t.Fatalf("SetCredential() error: %v", err)
	}

	loaded, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if len(loaded.Credentials) != 1 {
		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
	}

	cred := loaded.Credentials["google-antigravity"]
	if cred == nil {
		t.Fatal("google-antigravity credential missing")
	}
	if cred.AccessToken != "fresh-token" {
		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
	}
	if !cred.ExpiresAt.Equal(refreshedExpiry) {
		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, refreshedExpiry)
	}
}

func TestDeleteCredentialRemovesLegacyAntigravityAlias(t *testing.T) {
	tmpDir := setTestAuthHome(t)

	legacyStore := map[string]any{
		"credentials": map[string]any{
			"antigravity": map[string]any{
				"access_token": "legacy-token",
				"provider":     "antigravity",
				"auth_method":  "oauth",
			},
		},
	}
	data, err := json.Marshal(legacyStore)
	if err != nil {
		t.Fatalf("json.Marshal() error: %v", err)
	}
	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
	err = os.MkdirAll(filepath.Dir(path), 0o755)
	if err != nil {
		t.Fatalf("MkdirAll() error: %v", err)
	}
	err = os.WriteFile(path, data, 0o600)
	if err != nil {
		t.Fatalf("WriteFile() error: %v", err)
	}

	err = DeleteCredential(" google-antigravity ")
	if err != nil {
		t.Fatalf("DeleteCredential() error: %v", err)
	}

	loaded, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if len(loaded.Credentials) != 0 {
		t.Fatalf("credential count = %d, want 0", len(loaded.Credentials))
	}
}

func TestSetCredentialCanonicalizesTrimmedMixedCaseProvider(t *testing.T) {
	setTestAuthHome(t)

	expiresAt := time.Date(2026, 4, 16, 13, 0, 0, 0, time.UTC)
	if err := SetCredential("  AnTiGrAvItY  ", &AuthCredential{
		AccessToken: "fresh-token",
		ExpiresAt:   expiresAt,
		Provider:    "  AnTiGrAvItY  ",
		AuthMethod:  "oauth",
	}); err != nil {
		t.Fatalf("SetCredential() error: %v", err)
	}

	loaded, err := LoadStore()
	if err != nil {
		t.Fatalf("LoadStore() error: %v", err)
	}
	if len(loaded.Credentials) != 1 {
		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
	}

	cred := loaded.Credentials["google-antigravity"]
	if cred == nil {
		t.Fatal("google-antigravity credential missing")
	}
	if cred.Provider != "google-antigravity" {
		t.Fatalf("Provider = %q, want %q", cred.Provider, "google-antigravity")
	}
	if !cred.ExpiresAt.Equal(expiresAt) {
		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, expiresAt)
	}

	got, err := GetCredential("  GoOgLe-AnTiGrAvItY ")
	if err != nil {
		t.Fatalf("GetCredential() error: %v", err)
	}
	if got == nil {
		t.Fatal("GetCredential() returned nil")
	}
	if got.Provider != "google-antigravity" {
		t.Fatalf("GetCredential provider = %q, want %q", got.Provider, "google-antigravity")
	}
}