package client

import "testing"

func TestDecideTable(t *testing.T) {
	// A database this client has synced at version 2, digest "a".
	base := situation{LocalExists: true, LocalSHA: "a", SyncedSHA: "a", SyncedVersion: 2,
		RemoteSHA: "a", RemoteVersion: 2, CanWrite: true, Strategy: "server-wins"}

	with := func(f func(*situation)) situation {
		s := base
		f(&s)
		return s
	}

	for _, tc := range []struct {
		name string
		s    situation
		want action
	}{
		{"settled", base, actNothing},
		{"local save", with(func(s *situation) { s.LocalSHA = "b" }), actPush},
		{"remote update", with(func(s *situation) { s.RemoteSHA, s.RemoteVersion = "c", 3 }), actPull},
		{"missing local file", with(func(s *situation) { s.LocalExists = false }), actPull},
		{"missing local file, empty database", situation{RemoteVersion: 0}, actNothing},
		{"adopt a local file into an empty database",
			situation{LocalExists: true, LocalSHA: "a", CanWrite: true, Strategy: "server-wins"}, actPush},
		{"both changed, server wins", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion = "b", "c", 3
		}), actServerWins},
		{"both changed, client wins", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion, s.Strategy = "b", "c", 3, "client-wins"
		}), actForcePush},
		{"both changed, merge", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion, s.Strategy = "b", "c", 3, "merge"
		}), actPushForMerge},
		{"local save on a merge vault with no remote change", with(func(s *situation) {
			s.LocalSHA, s.Strategy = "b", "merge"
		}), actPush},
		{"both changed, manual", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion, s.Strategy = "b", "c", 3, "manual"
		}), actManual},
		{"manual conflict already reported", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion, s.Strategy = "b", "c", 3, "manual"
			s.ConflictSeen = true
		}), actNothing},
		{"local save without write access", with(func(s *situation) {
			s.LocalSHA, s.CanWrite = "b", false
		}), actRestore},
		{"both changed without write access", with(func(s *situation) {
			s.LocalSHA, s.RemoteSHA, s.RemoteVersion, s.CanWrite = "b", "c", 3, false
		}), actRestore},
		{"version moved but content identical", with(func(s *situation) {
			s.RemoteVersion = 3
		}), actPull},
	} {
		if got := decide(tc.s); got != tc.want {
			t.Errorf("%s: decide = %s, want %s", tc.name, got, tc.want)
		}
	}
}