package api

import (
	"errors"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"testing"
	"time"

	internalauth "github.com/rcourtman/pulse-go-rewrite/internal/auth"
	"github.com/rcourtman/pulse-go-rewrite/internal/config"
)

func resetRecoveryStore() {
	recoveryStore = nil
	recoveryStoreOnce = sync.Once{}
}

func TestQuickSecuritySetupRejectsUnauthenticatedForce(t *testing.T) {
	t.Setenv("PULSE_TRUSTED_PROXY_CIDRS", "")
	resetTrustedProxyConfig()

	hashed, err := internalauth.HashPassword("OldPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	cfg := &config.Config{
		AuthUser:   "admin",
		AuthPass:   hashed,
		DataPath:   t.TempDir(),
		ConfigPath: t.TempDir(),
	}

	router := &Router{config: cfg}
	handler := handleQuickSecuritySetupFixed(router)

	// Ensure rate limiter does not block test runs
	authLimiter.Reset("198.51.100.42")

	req := httptest.NewRequest(http.MethodPost, "/api/security/quick-setup",
		strings.NewReader(`{"username":"newadmin","password":"NewPassword!1","apiToken":"abcd","force":true}`))
	req.RemoteAddr = "198.51.100.42:54321"

	rr := httptest.NewRecorder()
	handler(rr, req)

	if rr.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 unauthorized, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestQuickSecuritySetupRequiresBootstrapToken(t *testing.T) {
	t.Setenv("PULSE_TRUSTED_PROXY_CIDRS", "")
	resetTrustedProxyConfig()

	dataDir := t.TempDir()

	cfg := &config.Config{
		DataPath:   dataDir,
		ConfigPath: dataDir,
	}

	router := &Router{
		config:      cfg,
		persistence: config.NewConfigPersistence(cfg.DataPath),
	}
	router.initializeBootstrapToken()

	tokenPath := filepath.Join(cfg.DataPath, bootstrapTokenFilename)
	content, err := os.ReadFile(tokenPath)
	if err != nil {
		t.Fatalf("read bootstrap token: %v", err)
	}
	bootstrapToken := strings.TrimSpace(string(content))
	if bootstrapToken == "" {
		t.Fatalf("bootstrap token is empty")
	}

	handler := handleQuickSecuritySetupFixed(router)

	authLimiter.Reset("198.51.100.80")

	payload := `{"username":"bootstrap","password":"StrongPass!1","apiToken":"` + strings.Repeat("aa", 32) + `"}`

	req := httptest.NewRequest(http.MethodPost, "/api/security/quick-setup", strings.NewReader(payload))
	req.RemoteAddr = "198.51.100.80:54321"
	rr := httptest.NewRecorder()
	handler(rr, req)
	if rr.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 unauthorized without bootstrap token, got %d (%s)", rr.Code, rr.Body.String())
	}

	authLimiter.Reset("198.51.100.80")

	reqWith := httptest.NewRequest(http.MethodPost, "/api/security/quick-setup", strings.NewReader(payload))
	reqWith.RemoteAddr = "198.51.100.80:54321"
	reqWith.Header.Set(bootstrapTokenHeader, bootstrapToken)

	rrWith := httptest.NewRecorder()
	handler(rrWith, reqWith)
	if rrWith.Code != http.StatusOK {
		t.Fatalf("expected 200 OK with valid bootstrap token, got %d (%s)", rrWith.Code, rrWith.Body.String())
	}

	if _, err := os.Stat(tokenPath); !errors.Is(err, os.ErrNotExist) {
		t.Fatalf("expected bootstrap token file to be removed after successful setup, got err=%v", err)
	}
	if router.bootstrapTokenHash != "" {
		t.Fatalf("expected bootstrap token hash to be cleared after successful setup")
	}
}

func TestValidateBootstrapTokenEndpoint(t *testing.T) {
	t.Setenv("PULSE_TRUSTED_PROXY_CIDRS", "")
	resetTrustedProxyConfig()

	dataDir := t.TempDir()
	cfg := &config.Config{
		DataPath:   dataDir,
		ConfigPath: dataDir,
	}

	router := &Router{config: cfg}
	router.initializeBootstrapToken()

	tokenPath := filepath.Join(cfg.DataPath, bootstrapTokenFilename)
	content, err := os.ReadFile(tokenPath)
	if err != nil {
		t.Fatalf("read bootstrap token: %v", err)
	}
	token := strings.TrimSpace(string(content))
	if token == "" {
		t.Fatalf("bootstrap token should not be empty")
	}

	handler := http.HandlerFunc(router.handleValidateBootstrapToken)

	// GET not allowed
	rr := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/api/security/validate-bootstrap-token", nil)
	handler.ServeHTTP(rr, req)
	if rr.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 for GET, got %d", rr.Code)
	}

	// Missing token payload
	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodPost, "/api/security/validate-bootstrap-token", strings.NewReader("{}"))
	handler.ServeHTTP(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 for missing token, got %d (%s)", rr.Code, rr.Body.String())
	}

	// Invalid token
	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodPost, "/api/security/validate-bootstrap-token", strings.NewReader(`{"token":"deadbeef"}`))
	handler.ServeHTTP(rr, req)
	if rr.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 for invalid token, got %d (%s)", rr.Code, rr.Body.String())
	}

	// Valid token
	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodPost, "/api/security/validate-bootstrap-token", strings.NewReader(`{"token":"`+token+`"}`))
	handler.ServeHTTP(rr, req)
	if rr.Code != http.StatusNoContent {
		t.Fatalf("expected 204 for valid token, got %d (%s)", rr.Code, rr.Body.String())
	}

	// Bootstrap token should remain on disk after validation
	if _, err := os.Stat(tokenPath); err != nil {
		t.Fatalf("bootstrap token should remain after validation, got err=%v", err)
	}

	// Once token removed, endpoint should report conflict
	router.clearBootstrapToken()
	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodPost, "/api/security/validate-bootstrap-token", strings.NewReader(`{"token":"`+token+`"}`))
	handler.ServeHTTP(rr, req)
	if rr.Code != http.StatusConflict {
		t.Fatalf("expected 409 when bootstrap token unavailable, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestQuickSecuritySetupAllowsRecoveryTokenRotation(t *testing.T) {
	t.Setenv("PULSE_TRUSTED_PROXY_CIDRS", "")
	resetTrustedProxyConfig()
	resetRecoveryStore()

	dataDir := t.TempDir()

	hashed, err := internalauth.HashPassword("OldPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	cfg := &config.Config{
		AuthUser:   "admin",
		AuthPass:   hashed,
		DataPath:   dataDir,
		ConfigPath: dataDir,
	}

	persistence := config.NewConfigPersistence(cfg.DataPath)

	router := &Router{
		config:      cfg,
		persistence: persistence,
	}

	InitRecoveryTokenStore(cfg.DataPath)
	token, err := GetRecoveryTokenStore().GenerateRecoveryToken(5 * time.Minute)
	if err != nil {
		t.Fatalf("generate recovery token: %v", err)
	}

	authLimiter.Reset("127.0.0.1")

	body := `{"username":"rotated","password":"RotatedPassword!1","apiToken":"deadbeef","force":true}`
	req := httptest.NewRequest(http.MethodPost, "/api/security/quick-setup", strings.NewReader(body))
	req.Header.Set("X-Recovery-Token", token)
	req.RemoteAddr = "127.0.0.1:54321"

	rr := httptest.NewRecorder()
	handler := handleQuickSecuritySetupFixed(router)
	handler(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected 200 OK, got %d (%s)", rr.Code, rr.Body.String())
	}

	if cfg.AuthUser != "rotated" {
		t.Fatalf("expected AuthUser to be rotated, got %q", cfg.AuthUser)
	}
	if !internalauth.CheckPasswordHash("RotatedPassword!1", cfg.AuthPass) {
		t.Fatalf("stored password hash does not match new password")
	}
	if len(cfg.APITokens) != 1 {
		t.Fatalf("expected one API token, got %d", len(cfg.APITokens))
	}
}

func TestQuickSecuritySetupRequiresSettingsScopeForTokens(t *testing.T) {
	t.Setenv("PULSE_TRUSTED_PROXY_CIDRS", "")
	resetTrustedProxyConfig()

	dataDir := t.TempDir()
	hashed, err := internalauth.HashPassword("ExistingPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	rawToken := strings.Repeat("ab", 32) // 64 hex chars
	record, err := config.NewAPITokenRecord(rawToken, "limited", []string{config.ScopeHostReport})
	if err != nil {
		t.Fatalf("new token record: %v", err)
	}

	cfg := &config.Config{
		AuthUser:        "admin",
		AuthPass:        hashed,
		DataPath:        dataDir,
		ConfigPath:      dataDir,
		APITokens:       []config.APITokenRecord{*record},
		APITokenEnabled: true,
	}
	cfg.SortAPITokens()

	router := &Router{
		config:      cfg,
		persistence: config.NewConfigPersistence(cfg.DataPath),
	}

	authLimiter.Reset("203.0.113.10")

	body := `{"username":"rotated","password":"RotatedPassword!1","apiToken":"deadbeef","force":true}`
	req := httptest.NewRequest(http.MethodPost, "/api/security/quick-setup", strings.NewReader(body))
	req.RemoteAddr = "203.0.113.10:1234"
	req.Header.Set("X-API-Token", rawToken)

	rr := httptest.NewRecorder()
	handler := handleQuickSecuritySetupFixed(router)
	handler(rr, req)

	if rr.Code != http.StatusForbidden {
		t.Fatalf("expected 403 forbidden for missing scope, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestRegenerateAPITokenRequiresSettingsScope(t *testing.T) {
	dataDir := t.TempDir()
	hashed, err := internalauth.HashPassword("ExistingPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	rawToken := strings.Repeat("cd", 32)
	record, err := config.NewAPITokenRecord(rawToken, "limited", []string{config.ScopeHostReport})
	if err != nil {
		t.Fatalf("new token record: %v", err)
	}

	cfg := &config.Config{
		AuthUser:        "admin",
		AuthPass:        hashed,
		DataPath:        dataDir,
		ConfigPath:      dataDir,
		APITokens:       []config.APITokenRecord{*record},
		APITokenEnabled: true,
	}
	cfg.SortAPITokens()

	router := &Router{
		config:      cfg,
		persistence: config.NewConfigPersistence(cfg.DataPath),
	}

	authLimiter.Reset("198.51.100.7")
	req := httptest.NewRequest(http.MethodPost, "/api/security/regenerate-token", nil)
	req.RemoteAddr = "198.51.100.7:44321"
	req.Header.Set("X-API-Token", rawToken)

	rr := httptest.NewRecorder()
	router.HandleRegenerateAPIToken(rr, req)

	if rr.Code != http.StatusForbidden {
		t.Fatalf("expected 403 forbidden for missing scope, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestValidateAPITokenRequiresSettingsScope(t *testing.T) {
	dataDir := t.TempDir()
	hashed, err := internalauth.HashPassword("ExistingPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	rawToken := strings.Repeat("ef", 32)
	record, err := config.NewAPITokenRecord(rawToken, "limited", []string{config.ScopeHostReport})
	if err != nil {
		t.Fatalf("new token record: %v", err)
	}

	cfg := &config.Config{
		AuthUser:        "admin",
		AuthPass:        hashed,
		DataPath:        dataDir,
		ConfigPath:      dataDir,
		APITokens:       []config.APITokenRecord{*record},
		APITokenEnabled: true,
	}
	cfg.SortAPITokens()

	router := &Router{
		config:      cfg,
		persistence: config.NewConfigPersistence(cfg.DataPath),
	}

	authLimiter.Reset("198.51.100.8")
	body := `{"token":"abcdef"}`
	req := httptest.NewRequest(http.MethodPost, "/api/security/validate-token", strings.NewReader(body))
	req.RemoteAddr = "198.51.100.8:54321"
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-API-Token", rawToken)

	rr := httptest.NewRecorder()
	router.HandleValidateAPIToken(rr, req)

	if rr.Code != http.StatusForbidden {
		t.Fatalf("expected 403 forbidden for missing scope, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestResetLockoutRequiresSettingsScope(t *testing.T) {
	dataDir := t.TempDir()
	hashed, err := internalauth.HashPassword("ExistingPassword!1")
	if err != nil {
		t.Fatalf("hash password: %v", err)
	}

	rawToken := strings.Repeat("12", 32)
	record, err := config.NewAPITokenRecord(rawToken, "limited", []string{config.ScopeHostReport})
	if err != nil {
		t.Fatalf("new token record: %v", err)
	}

	cfg := &config.Config{
		AuthUser:        "admin",
		AuthPass:        hashed,
		DataPath:        dataDir,
		ConfigPath:      dataDir,
		APITokens:       []config.APITokenRecord{*record},
		APITokenEnabled: true,
	}
	cfg.SortAPITokens()

	router := &Router{
		config: cfg,
	}

	authLimiter.Reset("198.51.100.9")
	body := `{"identifier":"admin"}`
	req := httptest.NewRequest(http.MethodPost, "/api/security/reset-lockout", strings.NewReader(body))
	req.RemoteAddr = "198.51.100.9:54321"
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-API-Token", rawToken)

	rr := httptest.NewRecorder()
	router.handleResetLockout(rr, req)

	if rr.Code != http.StatusForbidden {
		t.Fatalf("expected 403 forbidden for missing scope, got %d (%s)", rr.Code, rr.Body.String())
	}
}

func TestEnsureSettingsWriteScopeWithValidScope(t *testing.T) {
	dataDir := t.TempDir()

	rawToken := strings.Repeat("ab", 32)
	record, err := config.NewAPITokenRecord(rawToken, "admin-token", []string{config.ScopeSettingsWrite})
	if err != nil {
		t.Fatalf("new token record: %v", err)
	}

	cfg := &config.Config{
		DataPath:        dataDir,
		ConfigPath:      dataDir,
		APITokens:       []config.APITokenRecord{*record},
		APITokenEnabled: true,
	}
	cfg.SortAPITokens()

	req := httptest.NewRequest(http.MethodPost, "/api/security/test", nil)
	attachAPITokenRecord(req, record)

	rr := httptest.NewRecorder()
	result := ensureSettingsWriteScope(rr, req)

	if !result {
		t.Error("ensureSettingsWriteScope should return true when token has settings:write scope")
	}
	if rr.Code != http.StatusOK {
		t.Errorf("expected no error response, got status %d", rr.Code)
	}
}

func TestValidateBcryptHash(t *testing.T) {
	tests := []struct {
		name    string
		hash    string
		wantErr bool
		errMsg  string
	}{
		{
			name:    "valid $2a$ hash",
			hash:    "$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy",
			wantErr: false,
		},
		{
			name:    "valid $2b$ hash",
			hash:    "$2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy",
			wantErr: false,
		},
		{
			name:    "valid $2y$ hash",
			hash:    "$2y$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy",
			wantErr: false,
		},
		{
			name:    "truncated hash (59 chars)",
			hash:    "$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhW",
			wantErr: true,
			errMsg:  "expected 60 characters, got 59",
		},
		{
			name:    "too long hash (61 chars)",
			hash:    "$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWyX",
			wantErr: true,
			errMsg:  "expected 60 characters, got 61",
		},
		{
			name:    "empty hash",
			hash:    "",
			wantErr: true,
			errMsg:  "expected 60 characters, got 0",
		},
		{
			name:    "wrong prefix (md5 style, 60 chars)",
			hash:    "$1$saltsalt$WabcdEFGhijKLMnopQRstuV0123456789012345123456789",
			wantErr: true,
			errMsg:  "must start with $2a$, $2b$, or $2y$",
		},
		{
			name:    "wrong prefix ($2x$)",
			hash:    "$2x$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy",
			wantErr: true,
			errMsg:  "must start with $2a$, $2b$, or $2y$",
		},
		{
			name:    "no prefix at all (60 chars)",
			hash:    "N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy1234567",
			wantErr: true,
			errMsg:  "must start with $2a$, $2b$, or $2y$",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := validateBcryptHash(tt.hash)
			if tt.wantErr {
				if err == nil {
					t.Errorf("validateBcryptHash() expected error, got nil")
					return
				}
				if tt.errMsg != "" && !strings.Contains(err.Error(), tt.errMsg) {
					t.Errorf("validateBcryptHash() error = %q, want substring %q", err.Error(), tt.errMsg)
				}
			} else {
				if err != nil {
					t.Errorf("validateBcryptHash() unexpected error = %v", err)
				}
			}
		})
	}
}