//go:build integration

package inttest

import (
	"context"
	"encoding/json"
	"testing"
	"time"

	"github.com/google/uuid"

	"scrabble/backend/internal/engine"
	"scrabble/backend/internal/game"
)

// TestGameStateVoidsUnreplayableGame proves the lazy-void path: a game whose journal holds a
// move the current rules reject — here an illegal off-centre first move, standing in for a
// move that was legal when made but became illegal under tightened rules — is, on open,
// finished as a draw with end_reason 'aborted' instead of surfacing an "illegal play" error.
func TestGameStateVoidsUnreplayableGame(t *testing.T) {
	ctx := context.Background()
	svc := newGameService()
	acc0, acc1 := provisionAccount(t), provisionAccount(t)
	const seed = 1

	g, err := svc.Create(ctx, game.CreateParams{
		Variant: engine.VariantEnglish, Seats: []uuid.UUID{acc0, acc1}, TurnTimeout: 24 * time.Hour, Seed: seed,
	})
	if err != nil {
		t.Fatalf("create: %v", err)
	}

	// Seat 0's deterministic opening rack; pick two non-blank tiles for the crafted move.
	mirror, err := engine.New(testRegistry, engine.Options{Variant: engine.VariantEnglish, Version: testDictVersion, Players: 2, Seed: seed})
	if err != nil {
		t.Fatalf("mirror: %v", err)
	}
	var letters []string
	for _, l := range mirror.Hand(0) {
		if l != "?" {
			letters = append(letters, l)
		}
		if len(letters) == 2 {
			break
		}
	}
	if len(letters) < 2 {
		t.Fatal("need two non-blank opening tiles")
	}

	// Insert an illegal first move (off-centre, so the engine rejects it) as the only journal row.
	payload, err := json.Marshal(map[string]any{
		"rack": mirror.Hand(0),
		"dir":  "H",
		"tiles": []map[string]any{
			{"row": 0, "col": 0, "letter": letters[0]},
			{"row": 0, "col": 1, "letter": letters[1]},
		},
		"words": []string{letters[0] + letters[1]},
	})
	if err != nil {
		t.Fatalf("payload: %v", err)
	}
	if _, err := testDB.ExecContext(ctx,
		`INSERT INTO backend.game_moves (game_id, seq, seat, action, score, running_total, exchanged_count, payload)
		 VALUES ($1, 0, 0, 'play', 0, 0, 0, $2)`, g.ID, string(payload)); err != nil {
		t.Fatalf("insert crafted move: %v", err)
	}
	if _, err := testDB.ExecContext(ctx, `UPDATE backend.games SET move_count = 1 WHERE game_id = $1`, g.ID); err != nil {
		t.Fatalf("bump move_count: %v", err)
	}

	// Open through a fresh service so its live-game cache is cold and the crafted journal is
	// replayed (the real scenario: a player opening the game in a new session). It must not
	// error; the game comes back voided as a draw.
	svc2 := newGameService()
	view, err := svc2.GameState(ctx, g.ID, acc0)
	if err != nil {
		t.Fatalf("GameState on an unreplayable game should not error, got: %v", err)
	}
	if view.Game.Status != game.StatusFinished {
		t.Errorf("status = %q, want %q", view.Game.Status, game.StatusFinished)
	}
	if view.Game.EndReason != "aborted" {
		t.Errorf("end_reason = %q, want aborted", view.Game.EndReason)
	}
	for _, s := range view.Game.Seats {
		if s.IsWinner {
			t.Errorf("seat %d marked winner; an aborted game is a draw", s.Seat)
		}
	}

	// Idempotent: a second open (fresh cold cache) also succeeds and stays voided.
	if _, err := newGameService().GameState(ctx, g.ID, acc1); err != nil {
		t.Fatalf("second GameState should not error: %v", err)
	}
}