package config

import "testing"

func TestLoadDefaults(t *testing.T) {
	// Ensure no ambient values leak into the test.
	for _, k := range []string{
		"EMAIL_AGENT_ENV", "EMAIL_AGENT_ADDR", "EMAIL_AGENT_PORT",
		"EMAIL_AGENT_DB_PATH", "EMAIL_AGENT_LOG_LEVEL", "EMAIL_AGENT_PUBLIC_BASE_URL",
	} {
		t.Setenv(k, "")
	}

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.Port != DefaultPort {
		t.Errorf("Port = %d, want %d", cfg.Port, DefaultPort)
	}
	if cfg.Addr != DefaultAddr {
		t.Errorf("Addr = %q, want %q", cfg.Addr, DefaultAddr)
	}
	if cfg.Env != DefaultEnv {
		t.Errorf("Env = %q, want %q", cfg.Env, DefaultEnv)
	}
	if cfg.DBPath != DefaultDB {
		t.Errorf("DBPath = %q, want %q", cfg.DBPath, DefaultDB)
	}
}

func TestLoadOverrides(t *testing.T) {
	t.Setenv("EMAIL_AGENT_ENV", "production")
	t.Setenv("EMAIL_AGENT_PORT", "9000")
	t.Setenv("EMAIL_AGENT_DB_PATH", "/tmp/custom.db")
	t.Setenv("EMAIL_AGENT_LOG_LEVEL", "debug")
	t.Setenv("EMAIL_AGENT_PUBLIC_BASE_URL", "https://example.test/")
	t.Setenv("EMAIL_AGENT_ADDR", "")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.Port != 9000 {
		t.Errorf("Port = %d, want 9000", cfg.Port)
	}
	if cfg.Addr != ":9000" {
		t.Errorf("Addr = %q, want %q", cfg.Addr, ":9000")
	}
	if !cfg.IsProduction() {
		t.Errorf("IsProduction() = false, want true")
	}
	if cfg.PublicBaseURL != "https://example.test" {
		t.Errorf("PublicBaseURL = %q, want trimmed URL", cfg.PublicBaseURL)
	}
}

func TestLoadInvalidPort(t *testing.T) {
	t.Setenv("EMAIL_AGENT_PORT", "not-a-number")
	t.Setenv("EMAIL_AGENT_ADDR", "")
	if _, err := Load(); err == nil {
		t.Fatal("Load() error = nil, want error for invalid port")
	}
}

func TestLoadInvalidEnv(t *testing.T) {
	t.Setenv("EMAIL_AGENT_ENV", "staging")
	t.Setenv("EMAIL_AGENT_ADDR", "")
	if _, err := Load(); err == nil {
		t.Fatal("Load() error = nil, want error for invalid env")
	}
}