package db

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

func openTestDB(t *testing.T) *DB {
	t.Helper()
	dbase, err := Open(filepath.Join(t.TempDir(), "test.db"))
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	t.Cleanup(func() { dbase.Close() })
	return dbase
}

func TestShareCalendarAndLookup(t *testing.T) {
	dbase := openTestDB(t)

	if err := dbase.ShareCalendar("alice", "work", "bob", PermRead); err != nil {
		t.Fatalf("ShareCalendar: %v", err)
	}

	share, err := dbase.CalendarShareFor("alice", "work", "bob")
	if err != nil {
		t.Fatalf("CalendarShareFor: %v", err)
	}
	if share.Permission != PermRead {
		t.Errorf("Permission = %q, want %q", share.Permission, PermRead)
	}

	// Re-sharing with a different permission updates in place rather than
	// erroring or duplicating.
	if err := dbase.ShareCalendar("alice", "work", "bob", PermWrite); err != nil {
		t.Fatalf("ShareCalendar (update): %v", err)
	}
	share, err = dbase.CalendarShareFor("alice", "work", "bob")
	if err != nil {
		t.Fatalf("CalendarShareFor after update: %v", err)
	}
	if share.Permission != PermWrite {
		t.Errorf("Permission after update = %q, want %q", share.Permission, PermWrite)
	}

	shares, err := dbase.SharesOfCalendar("alice", "work")
	if err != nil {
		t.Fatalf("SharesOfCalendar: %v", err)
	}
	if len(shares) != 1 || shares[0].SharedWith != "bob" {
		t.Errorf("SharesOfCalendar = %+v, want single share with bob", shares)
	}
}

func TestCalendarShareForNotFound(t *testing.T) {
	dbase := openTestDB(t)

	_, err := dbase.CalendarShareFor("alice", "work", "bob")
	if !errors.Is(err, ErrShareNotFound) {
		t.Errorf("err = %v, want ErrShareNotFound", err)
	}
}

func TestUnshareCalendar(t *testing.T) {
	dbase := openTestDB(t)

	if err := dbase.ShareCalendar("alice", "work", "bob", PermRead); err != nil {
		t.Fatalf("ShareCalendar: %v", err)
	}
	if err := dbase.UnshareCalendar("alice", "work", "bob"); err != nil {
		t.Fatalf("UnshareCalendar: %v", err)
	}
	if _, err := dbase.CalendarShareFor("alice", "work", "bob"); !errors.Is(err, ErrShareNotFound) {
		t.Errorf("share still present after unshare: err = %v", err)
	}

	// Unsharing a non-existent share reports ErrShareNotFound.
	if err := dbase.UnshareCalendar("alice", "work", "bob"); !errors.Is(err, ErrShareNotFound) {
		t.Errorf("UnshareCalendar (already gone) = %v, want ErrShareNotFound", err)
	}
}

func TestCalendarsSharedWith(t *testing.T) {
	dbase := openTestDB(t)

	if err := dbase.ShareCalendar("alice", "work", "bob", PermRead); err != nil {
		t.Fatalf("ShareCalendar: %v", err)
	}
	if err := dbase.ShareCalendar("carol", "family", "bob", PermWrite); err != nil {
		t.Fatalf("ShareCalendar: %v", err)
	}
	// A share for a different user shouldn't show up for bob.
	if err := dbase.ShareCalendar("alice", "personal", "dave", PermRead); err != nil {
		t.Fatalf("ShareCalendar: %v", err)
	}

	shares, err := dbase.CalendarsSharedWith("bob")
	if err != nil {
		t.Fatalf("CalendarsSharedWith: %v", err)
	}
	if len(shares) != 2 {
		t.Fatalf("len(shares) = %d, want 2", len(shares))
	}
}

func TestShareCalendarInvalidPermission(t *testing.T) {
	dbase := openTestDB(t)
	if err := dbase.ShareCalendar("alice", "work", "bob", Permission("admin")); err == nil {
		t.Error("expected error for invalid permission, got nil")
	}
}

func TestShareAddressBookAndLookup(t *testing.T) {
	dbase := openTestDB(t)

	if err := dbase.ShareAddressBook("alice", "contacts", "bob", PermRead); err != nil {
		t.Fatalf("ShareAddressBook: %v", err)
	}

	share, err := dbase.AddressBookShareFor("alice", "contacts", "bob")
	if err != nil {
		t.Fatalf("AddressBookShareFor: %v", err)
	}
	if share.Permission != PermRead {
		t.Errorf("Permission = %q, want %q", share.Permission, PermRead)
	}

	if err := dbase.UnshareAddressBook("alice", "contacts", "bob"); err != nil {
		t.Fatalf("UnshareAddressBook: %v", err)
	}
	if _, err := dbase.AddressBookShareFor("alice", "contacts", "bob"); !errors.Is(err, ErrShareNotFound) {
		t.Errorf("share still present after unshare: err = %v", err)
	}
}

func TestAddressBooksSharedWith(t *testing.T) {
	dbase := openTestDB(t)

	if err := dbase.ShareAddressBook("alice", "contacts", "bob", PermRead); err != nil {
		t.Fatalf("ShareAddressBook: %v", err)
	}
	if err := dbase.ShareAddressBook("carol", "friends", "bob", PermWrite); err != nil {
		t.Fatalf("ShareAddressBook: %v", err)
	}

	shares, err := dbase.AddressBooksSharedWith("bob")
	if err != nil {
		t.Fatalf("AddressBooksSharedWith: %v", err)
	}
	if len(shares) != 2 {
		t.Fatalf("len(shares) = %d, want 2", len(shares))
	}
}