package common

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

// Addresses and ports below are deliberately different fixture values, not
// deployment defaults. These tests must never bind sockets or start servers.
func TestRuntimeConfigOverrides(t *testing.T) {
	t.Chdir(t.TempDir())
	for _, name := range []string{"GAC_CONFIG", "GAC_CLIENT_VERSION", "GAC_GAME_HOST", "GAC_GAME_PORT", "GAC_SDK_HOST", "GAC_SDK_PORT", "GAC_PUBLIC_GAME_HOST", "GAC_PUBLIC_SDK_URL"} {
		t.Setenv(name, "")
		if err := os.Unsetenv(name); err != nil {
			t.Fatal(err)
		}
	}
	base := `{"client_version":"fixture","game_host":"localhost","game_port":32101,"sdk_host":"localhost","sdk_port":32102,"public_game_host":"example.invalid","public_sdk_url":"https://example.invalid/base/"}`
	if err := os.WriteFile("server.json", []byte(base), 0600); err != nil {
		t.Fatal(err)
	}
	local := append([]byte{0xef, 0xbb, 0xbf}, []byte(`{"game_port":32201,"launcher":{"client_path":"fixture"}}`)...)
	if err := os.WriteFile("server.local.json", local, 0600); err != nil {
		t.Fatal(err)
	}
	cfg, err := LoadRuntimeConfig()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.GamePort != 32201 || cfg.SDKPort != 32102 || cfg.PublicSDKURL != "https://example.invalid/base" {
		t.Fatalf("merge failed: %+v", cfg)
	}
	t.Setenv("GAC_GAME_PORT", "32301")
	t.Setenv("GAC_PUBLIC_GAME_HOST", "gateway.example.invalid")
	cfg, err = LoadRuntimeConfig()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.GamePort != 32301 || cfg.PublicGameHost != "gateway.example.invalid" {
		t.Fatalf("environment override failed: %+v", cfg)
	}
	t.Setenv("GAC_GAME_PORT", "65536")
	if _, err := LoadRuntimeConfig(); err == nil {
		t.Fatal("out-of-range port accepted")
	}
	t.Setenv("GAC_GAME_PORT", "0")
	if _, err := LoadRuntimeConfig(); err == nil {
		t.Fatal("zero port accepted")
	}
}

func TestRuntimeConfigRequiresFile(t *testing.T) {
	t.Setenv("GAC_CONFIG", filepath.Join(t.TempDir(), "missing.json"))
	if _, err := LoadRuntimeConfig(); err == nil {
		t.Fatal("missing config silently accepted")
	}
}