package config

import (
	"strings"
	"testing"
	"time"
)

func TestGetenvBoolDefaults(t *testing.T) {
	t.Setenv("DESC_TEST_BOOL_UNSET", "")
	if getenvBool("DESC_TEST_BOOL_UNSET", false) != false {
		t.Fatal("empty should use fallback false")
	}
	t.Setenv("DESC_TEST_BOOL_TRUE", "true")
	if !getenvBool("DESC_TEST_BOOL_TRUE", false) {
		t.Fatal("expected true")
	}
	t.Setenv("DESC_TEST_BOOL_FALSE", "0")
	if getenvBool("DESC_TEST_BOOL_FALSE", true) {
		t.Fatal("expected false from 0")
	}
}

func TestLoadMaintenanceAndReadOnlyModes(t *testing.T) {
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	t.Setenv("MAINTENANCE_MODE", "")
	t.Setenv("READ_ONLY_MODE", "")
	t.Setenv("HYPERCARE_MODE", "")
	off, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if off.MaintenanceMode || off.ReadOnlyMode || off.HypercareMode {
		t.Fatalf("defaults want false/false/false, got maint=%v ro=%v hyper=%v", off.MaintenanceMode, off.ReadOnlyMode, off.HypercareMode)
	}

	t.Setenv("MAINTENANCE_MODE", "true")
	t.Setenv("READ_ONLY_MODE", "1")
	t.Setenv("HYPERCARE_MODE", "true")
	on, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if !on.MaintenanceMode || !on.ReadOnlyMode || !on.HypercareMode {
		t.Fatalf("want true/true/true, got maint=%v ro=%v hyper=%v", on.MaintenanceMode, on.ReadOnlyMode, on.HypercareMode)
	}

	t.Setenv("MAINTENANCE_MODE", "false")
	t.Setenv("READ_ONLY_MODE", "false")
	t.Setenv("HYPERCARE_MODE", "false")
	cleared, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cleared.MaintenanceMode || cleared.ReadOnlyMode || cleared.HypercareMode {
		t.Fatalf("explicit false want false/false/false, got maint=%v ro=%v hyper=%v", cleared.MaintenanceMode, cleared.ReadOnlyMode, cleared.HypercareMode)
	}
}

func TestLoadRateLimitReplicaEnv(t *testing.T) {
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	t.Setenv("RATE_LIMIT_REPLICAS", "")
	t.Setenv("RATE_LIMIT_MULTI_REPLICA", "")
	t.Setenv("RATE_LIMIT_BACKEND", "")
	defaultCfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if defaultCfg.RateLimitReplicas != 1 || defaultCfg.RateLimitBackend != "memory" || defaultCfg.ShouldWarnRateLimits() {
		t.Fatalf("defaults: replicas=%d backend=%q warn=%v", defaultCfg.RateLimitReplicas, defaultCfg.RateLimitBackend, defaultCfg.ShouldWarnRateLimits())
	}

	t.Setenv("RATE_LIMIT_REPLICAS", "4")
	t.Setenv("RATE_LIMIT_MULTI_REPLICA", "true")
	t.Setenv("RATE_LIMIT_BACKEND", "redis")
	multi, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if multi.RateLimitReplicas != 4 || multi.RateLimitBackend != "memory" || multi.RateLimitBackendRequested != "redis" {
		t.Fatalf("got replicas=%d backend=%q requested=%q", multi.RateLimitReplicas, multi.RateLimitBackend, multi.RateLimitBackendRequested)
	}
	if !multi.ShouldWarnRateLimits() {
		t.Fatal("expected warn for multi-replica / unsupported backend")
	}
	if !strings.Contains(multi.RateLimitWarningMessage(), "RATE_LIMIT_BACKEND=redis") {
		t.Fatalf("warning missing redis note: %s", multi.RateLimitWarningMessage())
	}

	t.Setenv("RATE_LIMIT_REPLICAS", "999")
	t.Setenv("RATE_LIMIT_MULTI_REPLICA", "false")
	t.Setenv("RATE_LIMIT_BACKEND", "memory")
	clamped, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if clamped.RateLimitReplicas != 128 {
		t.Fatalf("replicas clamp want 128 got %d", clamped.RateLimitReplicas)
	}
}

func TestGetenvDuration(t *testing.T) {
	t.Setenv("DESC_TEST_DUR", "500ms")
	if got := getenvDuration("DESC_TEST_DUR", time.Second); got != 500*time.Millisecond {
		t.Fatalf("got %v", got)
	}
	t.Setenv("DESC_TEST_DUR_SEC", "12")
	if got := getenvDuration("DESC_TEST_DUR_SEC", time.Second); got != 12*time.Second {
		t.Fatalf("got %v", got)
	}
	t.Setenv("DESC_TEST_DUR_ZERO", "0")
	if got := getenvDurationAllowZero("DESC_TEST_DUR_ZERO", time.Second); got != 0 {
		t.Fatalf("allow zero got %v", got)
	}
}

func TestCORSAllowedOriginsLoopbackTwin(t *testing.T) {
	got := CORSAllowedOrigins("http://localhost:28472")
	if len(got) != 2 || got[0] != "http://localhost:28472" || got[1] != "http://127.0.0.1:28472" {
		t.Fatalf("localhost twin = %#v", got)
	}
	got = CORSAllowedOrigins("http://127.0.0.1:28472/")
	if len(got) != 2 || got[0] != "http://127.0.0.1:28472" || got[1] != "http://localhost:28472" {
		t.Fatalf("127 twin = %#v", got)
	}
	got = CORSAllowedOrigins("https://app.example.com")
	if len(got) != 1 || got[0] != "https://app.example.com" {
		t.Fatalf("non-loopback must stay exact: %#v", got)
	}
}

func TestValidateWebOrigin(t *testing.T) {
	if err := validateWebOrigin("http://localhost:5174"); err != nil {
		t.Fatal(err)
	}
	if err := validateWebOrigin("*"); err == nil {
		t.Fatal("expected * rejected")
	}
	if err := validateWebOrigin("https://app.example.com/dashboard"); err == nil {
		t.Fatal("expected path rejected")
	}
	if got := normalizeWebOrigin("https://app.example.com/"); got != "https://app.example.com" {
		t.Fatalf("normalize = %q", got)
	}
}

func TestParseTrustedProxyNets(t *testing.T) {
	nets, err := ParseTrustedProxyNets([]string{"10.0.0.0/8", "192.0.2.1"})
	if err != nil {
		t.Fatal(err)
	}
	if len(nets) != 2 {
		t.Fatalf("len = %d", len(nets))
	}
	if _, err := ParseTrustedProxyNets([]string{"not-an-ip"}); err == nil {
		t.Fatal("expected invalid IP rejected")
	}
}

func TestProductionValidateFailsClosed(t *testing.T) {
	cfg := Config{
		AppEnv:                 "production",
		WebOrigin:              "https://app.example.com",
		SessionSecure:          false,
		AppEncryptionKey:       "x",
		TokenSigningSecret:     "y",
		EmailDryRun:            true, // default Load() is true; zero-value false would trip mail checks
		ProcessingPollInterval: 250 * time.Millisecond,
		DBMaxConns:             20,
		DBMinConns:             2,
		DBMaxConnLifetime:      time.Hour,
		DBMaxConnIdleTime:      5 * time.Minute,
		DBHealthCheckPeriod:    time.Minute,
		DBStatementTimeout:     30 * time.Second,
	}
	if err := cfg.validate(); err == nil {
		t.Fatal("expected SESSION_SECURE required")
	}
	cfg.SessionSecure = true
	cfg.StripeMock = true
	if err := cfg.validate(); err == nil {
		t.Fatal("expected STRIPE_MOCK rejected")
	}
	cfg.StripeMock = false
	cfg.AppEncryptionKey = ""
	if err := cfg.validate(); err == nil {
		t.Fatal("expected APP_ENCRYPTION_KEY required")
	}
	cfg.AppEncryptionKey = "enc"
	cfg.TokenSigningSecret = ""
	if err := cfg.validate(); err == nil {
		t.Fatal("expected TOKEN_SIGNING_SECRET required")
	}
	cfg.TokenSigningSecret = "tok"
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
	// Stripe keys are optional at boot (admin platform_settings); still reject mock.
	cfg.StripeSecretKey = ""
	cfg.StripeWebhookSecret = ""
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
	cfg.StripeSecretKey = "sk_live_test"
	cfg.StripeWebhookSecret = "whsec_test"
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
	cfg.WebOrigin = "https://localhost"
	if err := cfg.validate(); err == nil {
		t.Fatal("expected localhost WEB_ORIGIN rejected in production")
	}
	cfg.WebOrigin = "https://app.example.com"
	cfg.TrustedProxies = []string{"bad"}
	if err := cfg.validate(); err == nil {
		t.Fatal("expected invalid TRUSTED_PROXIES rejected")
	}
}

func TestProductionLoopbackWebOriginEscape(t *testing.T) {
	base := Config{
		AppEnv:                 "production",
		WebOrigin:              "http://localhost:28472",
		SessionSecure:          false,
		AppEncryptionKey:       "enc",
		TokenSigningSecret:     "tok",
		ProcessingPollInterval: 250 * time.Millisecond,
		DBMaxConns:             20,
		DBMinConns:             2,
		DBMaxConnLifetime:      time.Hour,
		DBMaxConnIdleTime:      5 * time.Minute,
		DBHealthCheckPeriod:    time.Minute,
		DBStatementTimeout:     30 * time.Second,
	}

	denied := base
	if err := denied.validate(); err == nil {
		t.Fatal("expected http loopback WEB_ORIGIN rejected without escape")
	} else if !strings.Contains(err.Error(), "ALLOW_INSECURE_LOCAL_PRODUCTION") {
		t.Fatalf("error should mention escape hatch: %v", err)
	}

	allowed := base
	allowed.AllowInsecureLocalProduction = true
	if err := allowed.validate(); err != nil {
		t.Fatal(err)
	}
	if !allowed.InsecureLocalProductionActive() {
		t.Fatal("expected insecure local production active")
	}
	if allowed.CookieSecure() {
		t.Fatal("http loopback escape should not force CookieSecure")
	}

	httpsLocal := allowed
	httpsLocal.WebOrigin = "https://localhost:28472"
	if err := httpsLocal.validate(); err == nil {
		t.Fatal("expected SESSION_SECURE required for https loopback escape")
	}
	httpsLocal.SessionSecure = true
	if err := httpsLocal.validate(); err != nil {
		t.Fatal(err)
	}

	// Escape must not weaken public (non-loopback) http.
	publicHTTP := base
	publicHTTP.AllowInsecureLocalProduction = true
	publicHTTP.WebOrigin = "http://app.example.com"
	publicHTTP.SessionSecure = true
	if err := publicHTTP.validate(); err == nil {
		t.Fatal("expected public http WEB_ORIGIN rejected even with escape flag")
	}
}

func TestValidateSMTPEnabledDoesNotRequireEnvHost(t *testing.T) {
	// SMTP credentials live in admin platform settings; boot must succeed with SMTP_ENABLED=true and empty host.
	cfg := Config{
		AppEnv:                 "development",
		WebOrigin:              "http://localhost:5174",
		SMTPEnabled:            true,
		ProcessingPollInterval: 250 * time.Millisecond,
		DBMaxConns:             20,
		DBMinConns:             2,
		DBMaxConnLifetime:      time.Hour,
		DBMaxConnIdleTime:      5 * time.Minute,
		DBHealthCheckPeriod:    time.Minute,
		DBStatementTimeout:     30 * time.Second,
	}
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
}

func TestProductionEmailDryRunFalseDoesNotRequireEnvDelivery(t *testing.T) {
	// Live delivery is configured in admin settings; production boot must not require RESEND/SMTP env.
	cfg := Config{
		AppEnv:                 "production",
		WebOrigin:              "https://app.example.com",
		SessionSecure:          true,
		AppEncryptionKey:       "enc",
		TokenSigningSecret:     "tok",
		StripeSecretKey:        "sk_live_test",
		StripeWebhookSecret:    "whsec_test",
		EmailDryRun:            false,
		ProcessingPollInterval: 250 * time.Millisecond,
		DBMaxConns:             20,
		DBMinConns:             2,
		DBMaxConnLifetime:      time.Hour,
		DBMaxConnIdleTime:      5 * time.Minute,
		DBHealthCheckPeriod:    time.Minute,
		DBStatementTimeout:     30 * time.Second,
	}
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
	cfg.SMTPEnabled = true
	cfg.SMTPFrom = "noreply@localhost"
	if err := cfg.validate(); err == nil {
		t.Fatal("expected localhost SMTP_FROM rejected in production")
	}
	cfg.SMTPFrom = "noreply@example.com"
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
}

func TestIsProductionEnv(t *testing.T) {
	t.Setenv("APP_ENV", "production")
	if !IsProductionEnv() {
		t.Fatal("expected production")
	}
	t.Setenv("APP_ENV", "prod")
	if !IsProductionEnv() {
		t.Fatal("expected prod")
	}
	t.Setenv("APP_ENV", "development")
	if IsProductionEnv() {
		t.Fatal("expected non-production")
	}
}

func TestCookieSecure(t *testing.T) {
	t.Parallel()
	if (Config{SessionSecure: true}).CookieSecure() != true {
		t.Fatal("SessionSecure should enable CookieSecure")
	}
	if (Config{AppEnv: "production"}).CookieSecure() != true {
		t.Fatal("production AppEnv should enable CookieSecure")
	}
	if (Config{AppEnv: "prod"}).CookieSecure() != true {
		t.Fatal("prod AppEnv should enable CookieSecure")
	}
	if (Config{AppEnv: "development", SessionSecure: false}).CookieSecure() {
		t.Fatal("development without SessionSecure should not enable CookieSecure")
	}
	insecureLocal := Config{
		AppEnv:                       "production",
		WebOrigin:                    "http://localhost:28472",
		AllowInsecureLocalProduction: true,
		SessionSecure:                false,
	}
	if insecureLocal.CookieSecure() {
		t.Fatal("insecure local production http escape should not force CookieSecure")
	}
}

func TestLoadSessionSecureDefaultsWithAppEnv(t *testing.T) {
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	t.Setenv("SESSION_SECURE", "")
	t.Setenv("APP_ENV", "development")
	dev, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if dev.SessionSecure {
		t.Fatal("development should default SessionSecure=false when unset")
	}

	// Production defaults Secure=true when SESSION_SECURE unset; still needs other prod knobs.
	t.Setenv("APP_ENV", "production")
	t.Setenv("WEB_ORIGIN", "https://app.example.com")
	t.Setenv("APP_ENCRYPTION_KEY", "enc-key")
	t.Setenv("TOKEN_SIGNING_SECRET", "tok-secret")
	t.Setenv("STRIPE_MOCK", "false")
	t.Setenv("STRIPE_SECRET_KEY", "sk_live_test")
	t.Setenv("STRIPE_WEBHOOK_SECRET", "whsec_test")
	prod, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if !prod.SessionSecure {
		t.Fatal("production should default SessionSecure=true when SESSION_SECURE unset")
	}
	if !prod.CookieSecure() {
		t.Fatal("production CookieSecure should be true")
	}
}

func TestValidateDBPool(t *testing.T) {
	valid := Config{
		DBMaxConns:              20,
		DBMinConns:              2,
		DBMaxConnLifetime:       time.Hour,
		DBMaxConnLifetimeJitter: 6 * time.Minute,
		DBMaxConnIdleTime:       5 * time.Minute,
		DBHealthCheckPeriod:     time.Minute,
		DBStatementTimeout:      30 * time.Second,
	}
	if err := valid.validateDBPool(); err != nil {
		t.Fatal(err)
	}
	bad := valid
	bad.DBMinConns = 50
	if err := bad.validateDBPool(); err == nil {
		t.Fatal("expected min > max rejected")
	}
	bad = valid
	bad.DBMaxConns = 0
	if err := bad.validateDBPool(); err == nil {
		t.Fatal("expected max < 1 rejected")
	}
	bad = valid
	bad.DBStatementTimeout = -time.Second
	if err := bad.validateDBPool(); err == nil {
		t.Fatal("expected negative statement timeout rejected")
	}
	bad = valid
	bad.DBMaxConnLifetimeJitter = -time.Second
	if err := bad.validateDBPool(); err == nil {
		t.Fatal("expected negative lifetime jitter rejected")
	}
	zeroTimeout := valid
	zeroTimeout.DBStatementTimeout = 0
	if err := zeroTimeout.validateDBPool(); err != nil {
		t.Fatal(err)
	}
	zeroJitter := valid
	zeroJitter.DBMaxConnLifetimeJitter = 0
	if err := zeroJitter.validateDBPool(); err != nil {
		t.Fatal(err)
	}
}

func TestLoadDBPoolDefaults(t *testing.T) {
	// Ensure unset env uses repo defaults (historical MaxConns/MinConns + idle/timeout).
	for _, key := range []string{
		"DB_MAX_CONNS", "DB_MIN_CONNS", "DB_MAX_CONN_LIFETIME", "DB_MAX_CONN_LIFETIME_JITTER",
		"DB_MAX_CONN_IDLE_TIME", "DB_HEALTH_CHECK_PERIOD", "DB_STATEMENT_TIMEOUT",
	} {
		t.Setenv(key, "")
	}
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DBMaxConns != 20 || cfg.DBMinConns != 2 {
		t.Fatalf("pool size defaults: max=%d min=%d", cfg.DBMaxConns, cfg.DBMinConns)
	}
	if cfg.DBMaxConnLifetime != time.Hour {
		t.Fatalf("lifetime: %v", cfg.DBMaxConnLifetime)
	}
	if cfg.DBMaxConnLifetimeJitter != 6*time.Minute {
		t.Fatalf("lifetime jitter: %v", cfg.DBMaxConnLifetimeJitter)
	}
	if cfg.DBMaxConnIdleTime != 5*time.Minute {
		t.Fatalf("idle: %v", cfg.DBMaxConnIdleTime)
	}
	if cfg.DBHealthCheckPeriod != time.Minute {
		t.Fatalf("health: %v", cfg.DBHealthCheckPeriod)
	}
	if cfg.DBStatementTimeout != 30*time.Second {
		t.Fatalf("statement timeout: %v", cfg.DBStatementTimeout)
	}
}

func TestLoadProcessingPollIntervalDefault(t *testing.T) {
	t.Setenv("PROCESSING_POLL_INTERVAL", "")
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.ProcessingPollInterval != 250*time.Millisecond {
		t.Fatalf("poll interval: %v want 250ms", cfg.ProcessingPollInterval)
	}
}

// Default must stay aligned with web DEFAULT_CSRF_COOKIE_NAME / PUBLIC_CSRF_COOKIE_NAME fallback.
func TestLoadCSRFCookieNameDefaultAndOverride(t *testing.T) {
	t.Setenv("WEB_ORIGIN", "http://localhost:5174")
	t.Setenv("CSRF_COOKIE_NAME", "")
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.CSRFCookieName != "descrybe_csrf" {
		t.Fatalf("CSRFCookieName default: %q want descrybe_csrf", cfg.CSRFCookieName)
	}

	t.Setenv("CSRF_COOKIE_NAME", "custom_csrf")
	override, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if override.CSRFCookieName != "custom_csrf" {
		t.Fatalf("CSRFCookieName override: %q want custom_csrf", override.CSRFCookieName)
	}
}

func TestValidateProcessingPollInterval(t *testing.T) {
	cfg := Config{
		AppEnv:                 "development",
		WebOrigin:              "http://localhost:5174",
		ProcessingPollInterval: 250 * time.Millisecond,
		DBMaxConns:             20,
		DBMinConns:             2,
		DBMaxConnLifetime:      time.Hour,
		DBMaxConnIdleTime:      5 * time.Minute,
		DBHealthCheckPeriod:    time.Minute,
		DBStatementTimeout:     30 * time.Second,
	}
	if err := cfg.validate(); err != nil {
		t.Fatal(err)
	}
	cfg.ProcessingPollInterval = 0
	if err := cfg.validate(); err == nil {
		t.Fatal("expected PROCESSING_POLL_INTERVAL > 0")
	}
}

func TestSessionCookieParentDomain(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name string
		web  string
		api  string
		want string
	}{
		{name: "prod_split", web: "https://descrybe.io", api: "https://api.descrybe.io", want: "descrybe.io"},
		{name: "prod_split_reversed", web: "https://app.descrybe.io", api: "https://descrybe.io", want: "descrybe.io"},
		{name: "sibling_subdomains", web: "https://app.descrybe.io", api: "https://api.descrybe.io", want: "descrybe.io"},
		{name: "localhost_ports", web: "http://localhost:28472", api: "http://localhost:28471", want: ""},
		{name: "loopback_ip", web: "http://127.0.0.1:28472", api: "http://127.0.0.1:28471", want: ""},
		{name: "same_host", web: "https://descrybe.io", api: "https://descrybe.io", want: ""},
		{name: "unrelated_hosts", web: "https://descrybe.io", api: "https://example.com", want: ""},
		{name: "empty_api", web: "https://descrybe.io", api: "", want: ""},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			c := Config{WebOrigin: tc.web, PublicAPIURL: tc.api}
			if got := c.SessionCookieParentDomain(); got != tc.want {
				t.Fatalf("web=%q api=%q got %q want %q", tc.web, tc.api, got, tc.want)
			}
		})
	}
}