package config

import (
	"testing"
	"time"
)

func setRequiredEnv(t *testing.T) {
	t.Helper()
	t.Setenv("MCP_GARMIN_PYTHON", "/usr/bin/python3")
	t.Setenv("MCP_GARMIN_SERVER", "/opt/mcp-garmin/server.py")
	t.Setenv("GENIUSRUN_PUBLIC_BASE_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_DerivesOIDCSettingsFromPublicBaseURL(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)
	}
	if cfg.SessionDuration != 720*time.Hour {
		t.Errorf("SessionDuration = %v, want default 720h", cfg.SessionDuration)
	}
}

func TestLoad_HTTPBaseURLYieldsInsecureCookies(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_PUBLIC_BASE_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_PUBLIC_BASE_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_CustomRoleAndDuration(t *testing.T) {
	setRequiredEnv(t)
	t.Setenv("GENIUSRUN_OIDC_REQUIRED_ROLE", "admin")
	t.Setenv("GENIUSRUN_SESSION_DURATION", "24h")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.OIDCRequiredRole != "admin" {
		t.Errorf("OIDCRequiredRole = %q", cfg.OIDCRequiredRole)
	}
	if cfg.SessionDuration != 24*time.Hour {
		t.Errorf("SessionDuration = %v", cfg.SessionDuration)
	}
}