package config

import (
	"testing"
	"time"
)

func TestLoadDefaults(t *testing.T) {
	t.Setenv("DATABASE_URL", "postgres://localhost/ctcloud")
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.DatabaseURL != "postgres://localhost/ctcloud" {
		t.Fatalf("database url = %q", c.DatabaseURL)
	}
	if c.DNSWorkers != 64 || c.DNSMaxCNAMEdepth != 8 {
		t.Fatalf("unexpected DNS defaults: %+v", c)
	}
	if c.ActiveProbing {
		t.Fatal("active probing must default to false")
	}
}

func TestLoadOverrides(t *testing.T) {
	t.Setenv("DATABASE_URL", "postgres://localhost/ctcloud")
	t.Setenv("DNS_WORKERS", "4")
	t.Setenv("ACTIVE_PROBING", "true")
	t.Setenv("DB_FLUSH_INTERVAL", "250ms")
	t.Setenv("STATS_INTERVAL", "30s")
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.DNSWorkers != 4 || !c.ActiveProbing {
		t.Fatalf("overrides not applied: %+v", c)
	}
	if c.DBFlushInterval != 250*time.Millisecond || c.StatsInterval != 30*time.Second {
		t.Fatalf("duration overrides not applied: %+v", c)
	}
}

func TestLoadInvalid(t *testing.T) {
	t.Setenv("DATABASE_URL", "")
	if _, err := Load(); err == nil {
		t.Fatal("expected error without DATABASE_URL")
	}
	t.Setenv("DATABASE_URL", "postgres://localhost/ctcloud")
	t.Setenv("LOG_LEVEL", "verbose")
	if _, err := Load(); err == nil {
		t.Fatal("expected error for bad LOG_LEVEL")
	}
}