package email

import (
	"net"
	"strings"
	"testing"
	"time"
)

func TestFetchSinceRun(t *testing.T) {
	mk := func(subject string) string {
		return "Subject: " + subject + "\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nbody\r\n"
	}
	f := &fakeIMAP{
		uids: []uint32{1, 2, 3},
		msgs: map[uint32]string{1: mk("one"), 2: mk("two"), 3: mk("three")},
	}
	fs := FetchSince{
		Addr: "mail.example:993", User: "kami", Mailbox: "INBOX",
		Timeout: 5 * time.Second,
		Since:   time.Date(2026, 7, 30, 0, 0, 0, 0, time.UTC),
		Max:     2,
		Skip:    func(uid uint32) bool { return uid == 3 },
	}
	msgs, err := fs.RunWith("secret", func(addr string, timeout time.Duration) (*Conn, error) {
		cli, srv := net.Pipe()
		go f.serve(t, srv)
		return NewConn(cli, timeout)
	})
	if err != nil {
		t.Fatalf("run: %v", err)
	}
	// Newest first, the already-seen UID skipped, Max respected.
	if len(msgs) != 2 {
		t.Fatalf("got %d messages, want 2: %+v", len(msgs), msgs)
	}
	if msgs[0].Subject != "two" || msgs[1].Subject != "one" {
		t.Errorf("subjects = %q,%q, want two,one (newest first)", msgs[0].Subject, msgs[1].Subject)
	}
	if strings.Contains(strings.Join(f.cmds, " "), "UID FETCH 3") {
		t.Error("a skipped UID must not be fetched again")
	}
}

func TestFetchSinceRequiresConfig(t *testing.T) {
	if _, err := (FetchSince{}).Run("secret"); err == nil {
		t.Fatal("an unconfigured mailbox must not be read")
	}
}