package render

import (
	"strings"
	"testing"

	flatbuffers "github.com/google/flatbuffers/go"

	"scrabble/pkg/fbs/scrabblefb"
)

const gameID = "7c9e6679-7425-40de-944b-e07fc1f90ae7"

func yourTurnPayload(id string) []byte {
	b := flatbuffers.NewBuilder(0)
	gid := b.CreateString(id)
	scrabblefb.YourTurnEventStart(b)
	scrabblefb.YourTurnEventAddGameId(b, gid)
	b.Finish(scrabblefb.YourTurnEventEnd(b))
	return b.FinishedBytes()
}

func nudgePayload(id string) []byte {
	b := flatbuffers.NewBuilder(0)
	gid := b.CreateString(id)
	scrabblefb.NudgeEventStart(b)
	scrabblefb.NudgeEventAddGameId(b, gid)
	b.Finish(scrabblefb.NudgeEventEnd(b))
	return b.FinishedBytes()
}

func matchFoundPayload(id string) []byte {
	b := flatbuffers.NewBuilder(0)
	gid := b.CreateString(id)
	scrabblefb.MatchFoundEventStart(b)
	scrabblefb.MatchFoundEventAddGameId(b, gid)
	b.Finish(scrabblefb.MatchFoundEventEnd(b))
	return b.FinishedBytes()
}

func notifyPayload(kind string) []byte {
	b := flatbuffers.NewBuilder(0)
	k := b.CreateString(kind)
	scrabblefb.NotificationEventStart(b)
	scrabblefb.NotificationEventAddKind(b, k)
	b.Finish(scrabblefb.NotificationEventEnd(b))
	return b.FinishedBytes()
}

func enrichedYourTurnPayload(id, name, action, word, score string) []byte {
	b := flatbuffers.NewBuilder(0)
	gid := b.CreateString(id)
	n := b.CreateString(name)
	a := b.CreateString(action)
	w := b.CreateString(word)
	s := b.CreateString(score)
	scrabblefb.YourTurnEventStart(b)
	scrabblefb.YourTurnEventAddGameId(b, gid)
	scrabblefb.YourTurnEventAddOpponentName(b, n)
	scrabblefb.YourTurnEventAddLastAction(b, a)
	scrabblefb.YourTurnEventAddLastWord(b, w)
	scrabblefb.YourTurnEventAddScoreLine(b, s)
	b.Finish(scrabblefb.YourTurnEventEnd(b))
	return b.FinishedBytes()
}

func gameOverPayload(id, result, score string) []byte {
	b := flatbuffers.NewBuilder(0)
	gid := b.CreateString(id)
	r := b.CreateString(result)
	s := b.CreateString(score)
	scrabblefb.GameOverEventStart(b)
	scrabblefb.GameOverEventAddGameId(b, gid)
	scrabblefb.GameOverEventAddResult(b, r)
	scrabblefb.GameOverEventAddScoreLine(b, s)
	b.Finish(scrabblefb.GameOverEventEnd(b))
	return b.FinishedBytes()
}

// TestRenderYourTurnEnriched checks the enriched "your turn" body names the opponent, their word
// and the recipient-first score for a scoring play, and uses the shorter phrase for an exchange.
func TestRenderYourTurnEnriched(t *testing.T) {
	en, ok := Render("your_turn", enrichedYourTurnPayload(gameID, "Ann", "play", "STOOL", "120:95"), "en")
	if !ok {
		t.Fatal("expected ok")
	}
	for _, want := range []string{"Ann", "STOOL", "120:95"} {
		if !strings.Contains(en.Text, want) {
			t.Errorf("en play text %q missing %q", en.Text, want)
		}
	}
	ru, _ := Render("your_turn", enrichedYourTurnPayload(gameID, "Аня", "play", "СТОЛ", "120:95"), "ru")
	for _, want := range []string{"Аня", "СТОЛ", "120:95", "мой ход"} {
		if !strings.Contains(ru.Text, want) {
			t.Errorf("ru play text %q missing %q", ru.Text, want)
		}
	}
	ex, _ := Render("your_turn", enrichedYourTurnPayload(gameID, "Ann", "exchange", "", ""), "en")
	if !strings.Contains(ex.Text, "Ann") || strings.Contains(ex.Text, "«") {
		t.Errorf("en exchange text %q should name the opponent and carry no word", ex.Text)
	}
}

// TestRenderGameOver checks the game_over body reads from the recipient's perspective in both
// languages and carries the game deep-link.
func TestRenderGameOver(t *testing.T) {
	cases := []struct{ result, en, ru string }{
		{"won", "won", "выиграли"},
		{"lost", "lost", "проиграли"},
		{"draw", "draw", "ничья"},
	}
	for _, tc := range cases {
		en, ok := Render("game_over", gameOverPayload(gameID, tc.result, "120:95"), "en")
		if !ok {
			t.Fatalf("%s: expected ok", tc.result)
		}
		if en.StartParam != "g"+gameID {
			t.Errorf("%s StartParam = %q, want g%s", tc.result, en.StartParam, gameID)
		}
		if !strings.Contains(strings.ToLower(en.Text), tc.en) || !strings.Contains(en.Text, "120:95") {
			t.Errorf("en %s text %q", tc.result, en.Text)
		}
		ru, _ := Render("game_over", gameOverPayload(gameID, tc.result, "120:95"), "ru")
		if !strings.Contains(ru.Text, tc.ru) {
			t.Errorf("ru %s text %q missing %q", tc.result, ru.Text, tc.ru)
		}
	}
}

func TestRenderGameEvents(t *testing.T) {
	cases := []struct {
		name, kind string
		payload    []byte
	}{
		{"your_turn", "your_turn", yourTurnPayload(gameID)},
		{"nudge", "nudge", nudgePayload(gameID)},
		{"match_found", "match_found", matchFoundPayload(gameID)},
	}
	for _, tc := range cases {
		t.Run(tc.name+" en", func(t *testing.T) {
			m, ok := Render(tc.kind, tc.payload, "en")
			if !ok {
				t.Fatal("expected ok")
			}
			if m.StartParam != "g"+gameID {
				t.Errorf("StartParam = %q, want g%s", m.StartParam, gameID)
			}
			if m.ButtonText != "Open game" {
				t.Errorf("ButtonText = %q, want Open game", m.ButtonText)
			}
			if m.Text == "" {
				t.Error("Text is empty")
			}
		})
		t.Run(tc.name+" ru", func(t *testing.T) {
			m, ok := Render(tc.kind, tc.payload, "ru")
			if !ok {
				t.Fatal("expected ok")
			}
			if m.ButtonText != "Открыть игру" {
				t.Errorf("ButtonText = %q, want Открыть игру", m.ButtonText)
			}
		})
	}
}

func TestRenderNotify(t *testing.T) {
	cases := map[string]struct {
		subKind string
		wantOK  bool
	}{
		"invitation":     {"invitation", true},
		"friend_request": {"friend_request", true},
		"friend_added":   {"friend_added", false},
		"game_started":   {"game_started", false},
	}
	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			m, ok := Render("notify", notifyPayload(tc.subKind), "en")
			if ok != tc.wantOK {
				t.Fatalf("ok = %v, want %v", ok, tc.wantOK)
			}
			if ok && m.StartParam != "" {
				t.Errorf("StartParam = %q, want empty (lobby)", m.StartParam)
			}
		})
	}
}

func TestRenderSkipsUnpushedKinds(t *testing.T) {
	for _, kind := range []string{"opponent_moved", "chat_message", "unknown"} {
		if _, ok := Render(kind, nil, "en"); ok {
			t.Errorf("kind %q: ok = true, want false", kind)
		}
	}
}