package smtp

import (
	"reflect"
	"testing"
)

func TestParseJSONAddresses_structured(t *testing.T) {
	data := []byte(`[{"address":"alice@example.com"},{"address":"bob@example.com"}]`)
	got := parseJSONAddresses(data)
	want := []string{"alice@example.com", "bob@example.com"}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("parseJSONAddresses() = %v, want %v", got, want)
	}
}

func TestParseJSONAddresses_plainStrings(t *testing.T) {
	data := []byte(`["alice@example.com","bob@example.com"]`)
	got := parseJSONAddresses(data)
	want := []string{"alice@example.com", "bob@example.com"}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("parseJSONAddresses() = %v, want %v", got, want)
	}
}

func TestParseJSONAddresses_empty(t *testing.T) {
	if got := parseJSONAddresses(nil); got != nil {
		t.Fatalf("parseJSONAddresses(nil) = %v, want nil", got)
	}
	if got := parseJSONAddresses([]byte{}); got != nil {
		t.Fatalf("parseJSONAddresses([]) = %v, want nil", got)
	}
	if got := parseJSONAddresses([]byte(`[]`)); len(got) != 0 {
		t.Fatalf("parseJSONAddresses([]) = %v, want empty slice", got)
	}
}

func TestParseJSONAddresses_invalid(t *testing.T) {
	got := parseJSONAddresses([]byte(`not-json`))
	if got != nil {
		t.Fatalf("parseJSONAddresses(invalid) = %v, want nil", got)
	}
}

func TestParseJSONAddresses_missingAddressField(t *testing.T) {
	data := []byte(`[{"name":"Alice"}]`)
	got := parseJSONAddresses(data)
	want := []string{""}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("parseJSONAddresses() = %v, want %v", got, want)
	}
}