package config

import (
	"testing"
)

func setRequiredEnv(t *testing.T) {
	t.Helper()
	t.Setenv("GENIUSRUN_BACKEND_URL", "https://geniusrun.example.com")
	t.Setenv("GENIUSRUN_OIDC_ISSUER_URL", "https://keycloak.example.com/realms/myrealm")
	t.Setenv("GENIUSRUN_OIDC_CLIENT_ID", "geniusrun")
	t.Setenv("GENIUSRUN_OIDC_CLIENT_SECRET", "client-secret")
	t.Setenv("GENIUSRUN_SESSION_SECRET", "a-session-secret-that-is-at-least-32-bytes-long")
}

func TestLoad_DerivesOIDCSettingsFromBackendURL(t *testing.T) {
	setRequiredEnv(t)

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.OIDCRedirectURL != "https://geniusrun.example.com/api/session/callback" {
		t.Errorf("OIDCRedirectURL = %q", cfg.OIDCRedirectURL)
	}
	if !cfg.SessionSecure {
		t.Error("SessionSecure = false, want true for an https base URL")
	}
	if cfg.OIDCRequiredRole != "geniusrun-user" {
		t.Errorf("OIDCRequiredRole = %q, want default", cfg.OIDCRequiredRole)
	}
}

func TestLoad_HTTPBaseURLYieldsInsecureCookies(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_BACKEND_URL", "http://localhost:8080")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.SessionSecure {
		t.Error("SessionSecure = true, want false for an http base URL")
	}
	if cfg.OIDCRedirectURL != "http://localhost:8080/api/session/callback" {
		t.Errorf("OIDCRedirectURL = %q", cfg.OIDCRedirectURL)
	}
}

func TestLoad_MissingRequiredOIDCVars(t *testing.T) {
	cases := []string{
		"GENIUSRUN_BACKEND_URL",
		"GENIUSRUN_OIDC_ISSUER_URL",
		"GENIUSRUN_OIDC_CLIENT_ID",
		"GENIUSRUN_OIDC_CLIENT_SECRET",
	}
	for _, missing := range cases {
		t.Run(missing, func(t *testing.T) {
			setRequiredEnv(t)
			t.Setenv(missing, "")
			if _, err := Load(); err == nil {
				t.Fatalf("expected error when %s is unset", missing)
			}
		})
	}
}

func TestLoad_SessionSecretTooShort(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_SESSION_SECRET", "too-short")

	if _, err := Load(); err == nil {
		t.Fatal("expected error for a session secret under 32 characters")
	}
}

func TestLoad_GarminTokenStoreRootDefaultsIndependentlyOfDBPath(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_TOKENSTORE_PATH", "")
	t.Setenv("GENIUSRUN_DB_PATH", "/var/lib/geniusrun/geniusrun.db")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.GarminTokenStoreRoot != ".garmin" {
		t.Errorf("GarminTokenStoreRoot = %q, want %q (never derived from DBPath's directory)", cfg.GarminTokenStoreRoot, ".garmin")
	}
}

func TestLoad_GarminTokenStoreRootExplicitOverridesDefault(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_TOKENSTORE_PATH", "/custom/tokenstores")
	t.Setenv("GENIUSRUN_DB_PATH", "/var/lib/geniusrun/geniusrun.db")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.GarminTokenStoreRoot != "/custom/tokenstores" {
		t.Errorf("GarminTokenStoreRoot = %q, want explicit override to take precedence", cfg.GarminTokenStoreRoot)
	}
}

func TestLoad_LogLevelDefaultsToInfo(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_LOG_LEVEL", "")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.LogLevel != "info" {
		t.Errorf("LogLevel = %q, want default %q", cfg.LogLevel, "info")
	}
}

func TestLoad_LogLevelExplicitOverridesDefault(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_LOG_LEVEL", "debug")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.LogLevel != "debug" {
		t.Errorf("LogLevel = %q, want debug", cfg.LogLevel)
	}
}

func TestLoad_GarminPythonPathDefaultsToPython3(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_PYTHON_PATH", "")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.GarminPythonPath != "python3" {
		t.Errorf("GarminPythonPath = %q, want default %q", cfg.GarminPythonPath, "python3")
	}
}

func TestLoad_GarminPythonPathExplicitOverridesDefault(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_PYTHON_PATH", "/opt/venv/bin/python3")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.GarminPythonPath != "/opt/venv/bin/python3" {
		t.Errorf("GarminPythonPath = %q, want explicit override", cfg.GarminPythonPath)
	}
}

func TestLoad_FrontendURLDefaultsToBackendURL(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_FRONTEND_URL", "")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.FrontendURL != cfg.BackendURL {
		t.Errorf("FrontendURL = %q, want it to default to BackendURL %q", cfg.FrontendURL, cfg.BackendURL)
	}
}

func TestLoad_FrontendURLExplicitOverridesDefault(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_FRONTEND_URL", "http://localhost:5173/")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.FrontendURL != "http://localhost:5173" {
		t.Errorf("FrontendURL = %q, want http://localhost:5173 (trailing slash trimmed)", cfg.FrontendURL)
	}
}

func TestLoad_CustomRole(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_OIDC_REQUIRED_ROLE", "admin")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.OIDCRequiredRole != "admin" {
		t.Errorf("OIDCRequiredRole = %q", cfg.OIDCRequiredRole)
	}
}