package subdisc

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

func TestRoundTrip(t *testing.T) {
	path := filepath.Join(t.TempDir(), "sub.json")
	s, _ := Open(path)
	err := s.Add(Entry{
		SubChannelID: "ch1", HostAgentID: "alice", HostUserID: "uA",
		GuestUserIDs: []string{"uB"}, CallbackGuildNodeID: "g1", CallbackChannelID: "pCh",
	})
	if err != nil {
		t.Fatal(err)
	}
	s2, _ := Open(path)
	e := s2.Lookup("ch1")
	if e == nil || e.HostAgentID != "alice" || e.CallbackChannelID != "pCh" {
		t.Errorf("entry = %+v", e)
	}
	if e.CreatedAt == "" {
		t.Errorf("CreatedAt should be auto-set")
	}
}

func TestLookupForHost(t *testing.T) {
	s, _ := Open(filepath.Join(t.TempDir(), "x.json"))
	s.Add(Entry{SubChannelID: "c", HostAgentID: "alice"})
	if s.LookupForHost("c", "alice") == nil {
		t.Errorf("alice should match")
	}
	if s.LookupForHost("c", "bob") != nil {
		t.Errorf("bob should NOT match")
	}
	if s.LookupForHost("missing", "alice") != nil {
		t.Errorf("missing channel should return nil")
	}
}

func TestRemove(t *testing.T) {
	s, _ := Open(filepath.Join(t.TempDir(), "x.json"))
	s.Add(Entry{SubChannelID: "c"})
	if !s.Remove("c") {
		t.Errorf("Remove existing should return true")
	}
	if s.Remove("c") {
		t.Errorf("Remove missing should return false")
	}
}

func TestAllReturnsCopy(t *testing.T) {
	s, _ := Open(filepath.Join(t.TempDir(), "x.json"))
	s.Add(Entry{SubChannelID: "a", HostAgentID: "alice"})
	s.Add(Entry{SubChannelID: "b", HostAgentID: "bob"})
	all := s.All()
	if len(all) != 2 {
		t.Errorf("len = %d", len(all))
	}
}

func TestOpenCorruptStartsEmpty(t *testing.T) {
	path := filepath.Join(t.TempDir(), "corrupt.json")
	os.WriteFile(path, []byte("not json"), 0o600)
	s, err := Open(path)
	if err != nil {
		t.Errorf("Open corrupt should tolerate: %v", err)
	}
	if len(s.All()) != 0 {
		t.Errorf("corrupt should start empty")
	}
}