package config_test

import (
	"os"
	"path/filepath"
	"testing"

	"keycape/internal/config"
)

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

// writeTempFile creates a temporary file with the given content and returns its path.
func writeTempFile(t *testing.T, content string) string {
	t.Helper()
	f, err := os.CreateTemp(t.TempDir(), "keycape-test-*")
	if err != nil {
		t.Fatalf("create temp file: %v", err)
	}
	if _, err := f.WriteString(content); err != nil {
		t.Fatalf("write temp file: %v", err)
	}
	f.Close()
	return f.Name()
}

// validConfig returns a minimal valid Config for use in tests.
func validConfig(keyPath string) *config.Config {
	return &config.Config{
		Issuer:        "https://auth.example.com",
		Port:          8080,
		TokenLifetime: "15m",
		PrivateKeyPEM: keyPath,
		Environment:   "dev",
		Clients: []config.ClientConfig{
			{
				ClientID:     "test-app",
				DisplayName:  "Test App",
				RedirectURIs: []string{"https://app.example.com/callback"},
				ClientType:   "public",
			},
		},
	}
}

// ---------------------------------------------------------------------------
// Load tests
// ---------------------------------------------------------------------------

func TestLoad_ValidYAML(t *testing.T) {
	keyPath := writeTempFile(t, "placeholder-key")
	yaml := `
issuer: "https://auth.example.com"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
clients:
  - clientId: "demo"
    displayName: "Demo"
    redirectUris:
      - "https://demo.example.com/cb"
    clientType: "public"
`
	cfgPath := writeTempFile(t, yaml)

	cfg, err := config.Load(cfgPath)
	if err != nil {
		t.Fatalf("Load: unexpected error: %v", err)
	}
	if cfg.Issuer != "https://auth.example.com" {
		t.Errorf("Issuer: want %q, got %q", "https://auth.example.com", cfg.Issuer)
	}
	if cfg.Port != 8080 {
		t.Errorf("Port: want 8080, got %d", cfg.Port)
	}
	if len(cfg.Clients) != 1 {
		t.Errorf("Clients: want 1, got %d", len(cfg.Clients))
	}
}

func TestLoad_AutheliaSplitURLs(t *testing.T) {
	keyPath := writeTempFile(t, "placeholder-key")
	yaml := `
issuer: "https://kc.example.com"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
authelia:
  baseURL: "http://authelia.sso.svc.cluster.local:9091"
  browserBaseURL: "https://auth.example.com"
  tokenBaseURL: "http://authelia.sso.svc.cluster.local:9091"
  clientId: "keycape"
  clientSecret: "secret"
  redirectURI: "https://kc.example.com/authorize/callback"
clients:
  - clientId: "netkingdom-bootstrap-console"
    displayName: "NetKingdom Bootstrap Console"
    redirectUris:
      - "http://127.0.0.1:8876/oidc/callback"
      - "http://localhost:8876/oidc/callback"
    clientType: "public"
`
	cfgPath := writeTempFile(t, yaml)

	cfg, err := config.Load(cfgPath)
	if err != nil {
		t.Fatalf("Load: unexpected error: %v", err)
	}
	if cfg.Authelia.BaseURL != "http://authelia.sso.svc.cluster.local:9091" {
		t.Errorf("Authelia.BaseURL: got %q", cfg.Authelia.BaseURL)
	}
	if cfg.Authelia.BrowserBaseURL != "https://auth.example.com" {
		t.Errorf("Authelia.BrowserBaseURL: got %q", cfg.Authelia.BrowserBaseURL)
	}
	if cfg.Authelia.TokenBaseURL != "http://authelia.sso.svc.cluster.local:9091" {
		t.Errorf("Authelia.TokenBaseURL: got %q", cfg.Authelia.TokenBaseURL)
	}
	if len(cfg.Clients) != 1 || cfg.Clients[0].ClientID != "netkingdom-bootstrap-console" {
		t.Fatalf("bootstrap client not loaded: %+v", cfg.Clients)
	}
	if got := cfg.Clients[0].RedirectURIs; len(got) != 2 || got[0] != "http://127.0.0.1:8876/oidc/callback" {
		t.Errorf("bootstrap redirect URIs not loaded: %+v", got)
	}
}

func TestLoad_ClientMFAAndRegistrationURL(t *testing.T) {
	keyPath := writeTempFile(t, "placeholder-key")
	yaml := `
issuer: "https://kc.example.com"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
clients:
  - clientId: "coulomb-social"
    displayName: "coulomb.social"
    redirectUris:
      - "https://coulomb.social/auth/callback/"
    clientType: "public"
    mfaRequired: false
    registrationUrl: "https://users.example.com/register"
`
	cfgPath := writeTempFile(t, yaml)
	cfg, err := config.Load(cfgPath)
	if err != nil {
		t.Fatalf("Load: unexpected error: %v", err)
	}
	if len(cfg.Clients) != 1 {
		t.Fatalf("clients: got %d", len(cfg.Clients))
	}
	c := cfg.Clients[0]
	if c.MFARequired == nil || *c.MFARequired {
		t.Fatalf("mfaRequired: want false, got %+v", c.MFARequired)
	}
	if c.RegistrationURL != "https://users.example.com/register" {
		t.Errorf("registrationUrl: got %q", c.RegistrationURL)
	}
}

func TestValidate_InvalidRegistrationURL(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Clients[0].RegistrationURL = "javascript:alert(1)"
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "registrationUrl") {
		t.Errorf("expected registrationUrl error, got %v", errs)
	}
}

func TestLoad_PrivacyIDEARequireForAll(t *testing.T) {
	keyPath := writeTempFile(t, "placeholder-key")
	yaml := `
issuer: "https://kc.example.com"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
privacyidea:
  baseURL: "http://privacyidea.mfa.svc.cluster.local:8080"
  adminToken: "service-token"
  realm: "coulomb"
  requireForAll: true
clients:
  - clientId: "netkingdom-bootstrap-console"
    displayName: "NetKingdom Bootstrap Console"
    redirectUris:
      - "http://127.0.0.1:8876/oidc/callback"
    clientType: "public"
`
	cfgPath := writeTempFile(t, yaml)

	cfg, err := config.Load(cfgPath)
	if err != nil {
		t.Fatalf("Load: unexpected error: %v", err)
	}
	if cfg.PrivacyIDEA.Realm != "coulomb" {
		t.Errorf("PrivacyIDEA.Realm: got %q", cfg.PrivacyIDEA.Realm)
	}
	if !cfg.PrivacyIDEA.RequireForAll {
		t.Error("PrivacyIDEA.RequireForAll should load from YAML")
	}
}

func TestLoad_LLDAPOrganisationalUnits(t *testing.T) {
	keyPath := writeTempFile(t, "placeholder-key")
	yaml := `
issuer: "https://kc.example.com"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
lldap:
  url: "ldap://lldap.sso.svc.cluster.local:3890"
  bindDN: "uid=admin,ou=people,dc=netkingdom,dc=local"
  bindPW: "secret"
  baseDN: "dc=netkingdom,dc=local"
  userOU: "ou=people"
  groupOU: "ou=groups"
clients:
  - clientId: "netkingdom-bootstrap-console"
    displayName: "NetKingdom Bootstrap Console"
    redirectUris:
      - "http://127.0.0.1:8876/oidc/callback"
    clientType: "public"
`
	cfgPath := writeTempFile(t, yaml)

	cfg, err := config.Load(cfgPath)
	if err != nil {
		t.Fatalf("Load: unexpected error: %v", err)
	}
	if cfg.LLDAP.UserOU != "ou=people" {
		t.Errorf("LLDAP.UserOU: got %q", cfg.LLDAP.UserOU)
	}
	if cfg.LLDAP.GroupOU != "ou=groups" {
		t.Errorf("LLDAP.GroupOU: got %q", cfg.LLDAP.GroupOU)
	}
}

func TestLoad_FileNotFound(t *testing.T) {
	_, err := config.Load(filepath.Join(t.TempDir(), "nonexistent.yaml"))
	if err == nil {
		t.Error("Load: expected error for missing file, got nil")
	}
}

func TestLoad_InvalidYAML(t *testing.T) {
	bad := writeTempFile(t, "not: valid: yaml: [[[")
	_, err := config.Load(bad)
	if err == nil {
		t.Error("Load: expected error for invalid YAML, got nil")
	}
}

// ---------------------------------------------------------------------------
// Validate tests
// ---------------------------------------------------------------------------

func TestValidate_ValidConfig(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	errs := config.ValidateConfig(validConfig(keyPath))
	if len(errs) != 0 {
		t.Errorf("ValidateConfig: expected no errors, got %v", errs)
	}
}

func TestValidate_MissingIssuer(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Issuer = ""
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "issuer") {
		t.Errorf("expected issuer error, got %v", errs)
	}
}

func TestValidate_InvalidIssuerURL(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Issuer = "not a url"
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "issuer") {
		t.Errorf("expected issuer URL error, got %v", errs)
	}
}

func TestValidate_PortZero(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Port = 0
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "port") {
		t.Errorf("expected port error, got %v", errs)
	}
}

func TestValidate_PortTooHigh(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Port = 70000
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "port") {
		t.Errorf("expected port error, got %v", errs)
	}
}

func TestValidate_NoClients(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Clients = nil
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "client") {
		t.Errorf("expected client error, got %v", errs)
	}
}

func TestValidate_ClientMissingRedirectURI(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Clients[0].RedirectURIs = nil
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "redirect") {
		t.Errorf("expected redirect_uri error, got %v", errs)
	}
}

func TestValidate_MissingPrivateKeyPEM(t *testing.T) {
	cfg := validConfig("")
	cfg.PrivateKeyPEM = ""
	errs := config.ValidateConfig(cfg)
	if !containsErr(errs, "privateKeyPem") {
		t.Errorf("expected privateKeyPem error, got %v", errs)
	}
}

func TestValidate_ClientCredentialsTokenLifetime(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Clients[0] = config.ClientConfig{
		ClientID:       "service-client",
		ClientType:     "confidential",
		GrantTypes:     []string{"client_credentials"},
		AllowedScopes:  []string{"openbao:login"},
		SecretRef:      "env:SERVICE_CLIENT_SECRET",
		ServiceSubject: "service:test",
		Tenant:         "tenant:coulomb",
		TokenLifetime:  "15m",
	}
	if errs := config.ValidateConfig(cfg); len(errs) != 0 {
		t.Fatalf("valid per-client token lifetime rejected: %v", errs)
	}

	cfg.Clients[0].TokenLifetime = "90m"
	if errs := config.ValidateConfig(cfg); !containsErr(errs, "between 1m and 1h") {
		t.Fatalf("expected bounded tokenLifetime error, got %v", errs)
	}

	cfg.Clients[0].TokenLifetime = "not-a-duration"
	if errs := config.ValidateConfig(cfg); !containsErr(errs, "valid duration") {
		t.Fatalf("expected invalid tokenLifetime error, got %v", errs)
	}
}

func TestValidate_PublicClientRejectsTokenLifetime(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	cfg := validConfig(keyPath)
	cfg.Clients[0].TokenLifetime = "15m"
	if errs := config.ValidateConfig(cfg); !containsErr(errs, "only supported for client_credentials") {
		t.Fatalf("expected public-client tokenLifetime error, got %v", errs)
	}
}

func TestServiceClientExampleContracts(t *testing.T) {
	cfg, err := config.Load(filepath.Join("..", "..", "..", "config", "service-clients.example.yaml"))
	if err != nil {
		t.Fatalf("load service client examples: %v", err)
	}
	cfg.Issuer = "https://kc.coulomb.social"
	cfg.Port = 8080
	cfg.PrivateKeyPEM = writeTempFile(t, "key")
	if errs := config.ValidateConfig(cfg); len(errs) != 0 {
		t.Fatalf("service client examples must validate: %v", errs)
	}
	if len(cfg.Clients) != 4 {
		t.Fatalf("service client examples: want 4, got %d", len(cfg.Clients))
	}

	codingAgent := cfg.Clients[0]
	if codingAgent.ClientID != "codex-railiance-platform" ||
		codingAgent.ServiceSubject != "service:codex:railiance-platform" ||
		codingAgent.Tenant != "tenant:coulomb" ||
		codingAgent.TokenLifetime != "15m" {
		t.Fatalf("coding-agent contract drifted: %+v", codingAgent)
	}
	if len(codingAgent.Roles) != 1 || codingAgent.Roles[0] != "coding-agent" ||
		len(codingAgent.AllowedScopes) != 1 || codingAgent.AllowedScopes[0] != "openbao:login" {
		t.Fatalf("coding-agent authorization contract drifted: %+v", codingAgent)
	}

	secretsEngine := cfg.Clients[1]
	if secretsEngine.ClientID != "secrets-engine-openbao" ||
		secretsEngine.ServiceSubject != "service:secrets-engine" ||
		secretsEngine.TokenLifetime != "15m" {
		t.Fatalf("secrets-engine contract drifted: %+v", secretsEngine)
	}
}

func TestDevConfigOpenBaoAdminAdmitsOperatorTunnelCallback(t *testing.T) {
	cfg, err := config.Load(filepath.Join("..", "..", "..", "config", "dev-config.yaml"))
	if err != nil {
		t.Fatalf("load dev config: %v", err)
	}
	if errs := config.ValidateConfig(cfg); len(errs) != 0 {
		t.Fatalf("dev config must validate: %v", errs)
	}

	const callback = "http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback"
	for _, client := range cfg.Clients {
		if client.ClientID != "openbao-admin" {
			continue
		}
		for _, redirectURI := range client.RedirectURIs {
			if redirectURI == callback {
				return
			}
		}
		t.Fatalf("openbao-admin redirectUris missing exact operator tunnel callback %q", callback)
	}
	t.Fatal("dev config missing openbao-admin client")
}

// ---------------------------------------------------------------------------
// Env var loading test
// ---------------------------------------------------------------------------

func TestLoad_FromEnvVar(t *testing.T) {
	keyPath := writeTempFile(t, "key")
	yaml := `
issuer: "https://auth.example.com"
port: 9090
tokenLifetime: "30m"
privateKeyPem: "` + keyPath + `"
environment: "dev"
clients:
  - clientId: "env-app"
    displayName: "Env App"
    redirectUris:
      - "https://env.example.com/cb"
    clientType: "public"
`
	cfgPath := writeTempFile(t, yaml)
	t.Setenv("KEYCAPE_CONFIG", cfgPath)

	// Load with empty path triggers env var lookup.
	cfg, err := config.Load("")
	if err != nil {
		t.Fatalf("Load with env var: %v", err)
	}
	if cfg.Port != 9090 {
		t.Errorf("Port: want 9090, got %d", cfg.Port)
	}
}

// ---------------------------------------------------------------------------
// Helper
// ---------------------------------------------------------------------------

func containsErr(errs []string, substring string) bool {
	for _, e := range errs {
		for i := 0; i <= len(e)-len(substring); i++ {
			if e[i:i+len(substring)] == substring {
				return true
			}
		}
	}
	return false
}

func TestValidateConfigAudience(t *testing.T) {
	for _, audience := range []string{"", "approval-engine", "https://api.example.com"} {
		cfg := validConfig("key.pem")
		cfg.Clients[0].Audience = audience
		if errs := config.ValidateConfig(cfg); len(errs) != 0 {
			t.Fatalf("valid audience %q: %v", audience, errs)
		}
	}
	for _, audience := range []string{" ", "approval-engine other", "approval-engine\n"} {
		cfg := validConfig("key.pem")
		cfg.Clients[0].Audience = audience
		if errs := config.ValidateConfig(cfg); len(errs) == 0 {
			t.Fatalf("accepted audience %q", audience)
		}
	}
}

// tenant_roles is opt-in, but a configured cache source must be usable: it sits
// on the synchronous token-issuance path (KEY-WP-0024).
func TestValidate_TenantEngine(t *testing.T) {
	cases := map[string]struct {
		engine config.TenantEngineConfig
		valid  bool
	}{
		"absent is valid":       {config.TenantEngineConfig{}, true},
		"http url":              {config.TenantEngineConfig{BaseURL: "http://tenant-engine:8080"}, true},
		"https url and timeout": {config.TenantEngineConfig{BaseURL: "https://tenant-engine", Timeout: "2s"}, true},
		"not a url":             {config.TenantEngineConfig{BaseURL: "tenant-engine"}, false},
		"wrong scheme":          {config.TenantEngineConfig{BaseURL: "ldap://tenant-engine"}, false},
		"unparseable timeout":   {config.TenantEngineConfig{BaseURL: "http://t", Timeout: "soon"}, false},
		"zero timeout":          {config.TenantEngineConfig{BaseURL: "http://t", Timeout: "0s"}, false},
		"timeout far too long":  {config.TenantEngineConfig{BaseURL: "http://t", Timeout: "5m"}, false},
		// A timeout with no base URL means someone expected the claim to be on.
		"timeout without url": {config.TenantEngineConfig{Timeout: "2s"}, false},
	}
	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			cfg := validConfig(writeTempFile(t, "key"))
			cfg.TenantEngine = tc.engine
			errs := config.ValidateConfig(cfg)
			if tc.valid && len(errs) != 0 {
				t.Fatalf("expected valid, got %v", errs)
			}
			if !tc.valid && len(errs) == 0 {
				t.Fatal("expected a validation error")
			}
		})
	}
}