package config

import (
	"bytes"
	"encoding/base64"
	"strings"
	"testing"
)

func TestLoadOIDCJITProvisioningDefaultsToDisabled(t *testing.T) {
	t.Setenv("OIDC_JIT_PROVISIONING_ENABLED", "")
	t.Setenv("OIDC_GATEWAY_TENANT_KEY", "")

	cfg := Load()
	if cfg.OIDCJITProvisioningEnabled {
		t.Fatal("OIDC JIT provisioning must be disabled by default")
	}
	if cfg.OIDCGatewayTenantKey != "" {
		t.Fatalf("unexpected gateway tenant key: %q", cfg.OIDCGatewayTenantKey)
	}
}

func TestValidateRequiresGatewayTenantKeyWhenOIDCJITIsEnabled(t *testing.T) {
	cfg := Config{
		OIDCEnabled:                true,
		OIDCJITProvisioningEnabled: true,
	}

	err := cfg.Validate()
	if err == nil || !strings.Contains(err.Error(), "OIDC_GATEWAY_TENANT_KEY") {
		t.Fatalf("Validate() error = %v, want missing OIDC_GATEWAY_TENANT_KEY", err)
	}

	cfg.OIDCGatewayTenantKey = "default"
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() with tenant key: %v", err)
	}
}

func TestLoadOIDCBrowserSessionUsesSafeEnvironmentDefaults(t *testing.T) {
	t.Setenv("APP_ENV", "development")
	t.Setenv("OIDC_BROWSER_SESSION_ENABLED", "")
	t.Setenv("OIDC_SESSION_COOKIE_SECURE", "")

	cfg := Load()
	if !cfg.OIDCBrowserSessionEnabled {
		t.Fatal("OIDC browser session should be enabled by default")
	}
	if cfg.OIDCSessionCookieSecure {
		t.Fatal("development cookie should allow localhost HTTP by default")
	}

	t.Setenv("APP_ENV", "production")
	cfg = Load()
	if !cfg.OIDCSessionCookieSecure {
		t.Fatal("production OIDC session cookie must default to Secure")
	}

	t.Setenv("APP_ENV", "staging")
	cfg = Load()
	if !cfg.OIDCSessionCookieSecure {
		t.Fatal("staging OIDC session cookie must default to Secure")
	}
}

func TestValidateRejectsInsecureNonLocalOIDCBrowserSession(t *testing.T) {
	cfg := Config{
		AppEnv:                          "staging",
		OIDCEnabled:                     true,
		OIDCBrowserSessionEnabled:       true,
		OIDCSessionCookieSecure:         false,
		CORSAllowedOrigin:               "https://gateway.example.com",
		OIDCClientID:                    "gateway-public",
		OIDCRedirectURI:                 "https://gateway.example.com/gateway-api/api/v1/auth/oidc/callback",
		OIDCPostLogoutRedirectURI:       "https://gateway.example.com/",
		OIDCSessionEncryptionKey:        base64.RawStdEncoding.EncodeToString(bytes.Repeat([]byte{1}, 32)),
		OIDCSessionIdleTTLSeconds:       1800,
		OIDCSessionAbsoluteTTLSeconds:   28800,
		OIDCSessionRefreshBeforeSeconds: 60,
	}
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "OIDC_SESSION_COOKIE_SECURE") {
		t.Fatalf("Validate() error = %v, want insecure non-local cookie rejection", err)
	}

	cfg.OIDCSessionCookieSecure = true
	cfg.CORSAllowedOrigin = "*"
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "CORS_ALLOWED_ORIGIN") {
		t.Fatalf("Validate() error = %v, want wildcard credentialed CORS rejection", err)
	}
}

func TestValidateRequiresCompletePublicClientSessionConfiguration(t *testing.T) {
	cfg := Config{
		AppEnv: "test", OIDCEnabled: true, OIDCBrowserSessionEnabled: true,
		OIDCSessionCookieSecure: false, CORSAllowedOrigin: "http://localhost:5178",
	}
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "OIDC_CLIENT_ID") {
		t.Fatalf("Validate() error = %v, want incomplete public client rejection", err)
	}

	cfg.OIDCClientID = "gateway-public"
	cfg.OIDCRedirectURI = "http://localhost:8088/api/v1/auth/oidc/callback"
	cfg.OIDCPostLogoutRedirectURI = "http://localhost:5178/"
	cfg.OIDCSessionEncryptionKey = base64.RawStdEncoding.EncodeToString(bytes.Repeat([]byte{2}, 32))
	cfg.OIDCSessionIdleTTLSeconds = 1800
	cfg.OIDCSessionAbsoluteTTLSeconds = 28800
	cfg.OIDCSessionRefreshBeforeSeconds = 60
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() valid public session config: %v", err)
	}
	key, err := cfg.OIDCSessionEncryptionKeyBytes()
	if err != nil || len(key) != 32 {
		t.Fatalf("decoded encryption key len=%d err=%v", len(key), err)
	}
}

func TestValidateRejectsPlaintextOrWrongLengthSessionKey(t *testing.T) {
	cfg := Config{
		AppEnv: "test", OIDCEnabled: true, OIDCBrowserSessionEnabled: true,
		OIDCClientID: "gateway-public", OIDCRedirectURI: "http://localhost:8088/callback",
		OIDCPostLogoutRedirectURI: "http://localhost:5178/", OIDCSessionEncryptionKey: strings.Repeat("x", 32),
		OIDCSessionIdleTTLSeconds: 1800, OIDCSessionAbsoluteTTLSeconds: 28800, OIDCSessionRefreshBeforeSeconds: 60,
		CORSAllowedOrigin: "http://localhost:5178",
	}
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "OIDC_SESSION_ENCRYPTION_KEY") {
		t.Fatalf("Validate() error = %v, want encoded AES-256 key rejection", err)
	}
}

func TestValidateRejectsOfflineAccessForBrowserSession(t *testing.T) {
	cfg := Config{
		AppEnv: "test", OIDCEnabled: true, OIDCBrowserSessionEnabled: true,
		OIDCRequiredScopes: []string{"gateway.access", "offline_access"},
	}
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "offline_access") {
		t.Fatalf("Validate() error = %v, want offline_access rejection", err)
	}
}