package config

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

func TestDefaultValidate(t *testing.T) {
    cfg := Default()
    if err := cfg.Validate(); err != nil {
        t.Fatalf("default config invalid: %v", err)
    }
}

func TestLoadAndValidate(t *testing.T) {
    dir := t.TempDir()
    path := filepath.Join(dir, "config.json")
    if err := os.WriteFile(path, []byte(`{"fm":{"frequencyMHz":99.9},"backend":{"kind":"file","outputPath":"out.f32"},"control":{"listenAddress":"127.0.0.1:8088"}}`), 0o644); err != nil {
        t.Fatalf("write config: %v", err)
    }
    cfg, err := Load(path)
    if err != nil {
        t.Fatalf("load config: %v", err)
    }
    if cfg.FM.FrequencyMHz != 99.9 {
        t.Fatalf("unexpected frequency: %v", cfg.FM.FrequencyMHz)
    }
}

func TestValidateRejectsBadFrequency(t *testing.T) {
    cfg := Default()
    cfg.FM.FrequencyMHz = 200
    if err := cfg.Validate(); err == nil {
        t.Fatal("expected validation error")
    }
}