//go:build integration

package inttest

import (
	"context"
	"testing"
	"time"

	"github.com/google/uuid"

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

// The first-move-draw suite covers the official seeding (docs/ARCHITECTURE.md §6): the draw is
// recorded with the game, decides seat 0 (the first mover), and — in auto-match — runs against
// a synthetic opponent at open time whose draw rows are back-filled when a real opponent joins.

// TestCreateRecordsFirstMoveDraws checks a directly-seated game records the draw against the
// real seated accounts and seats the drawn leader (the suite's deterministic draw elects the
// first-listed account) at seat 0.
func TestCreateRecordsFirstMoveDraws(t *testing.T) {
	ctx := context.Background()
	svc := newGameService()
	a := provisionAccount(t)
	b := provisionAccount(t)
	g, err := svc.Create(ctx, game.CreateParams{Variant: engine.VariantEnglish, Seats: []uuid.UUID{a, b}, TurnTimeout: 24 * time.Hour, Seed: 1})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	if g.Seats[0].AccountID != a || g.Seats[1].AccountID != b {
		t.Fatalf("seats = [%s %s], want [a b]", g.Seats[0].AccountID, g.Seats[1].AccountID)
	}
	draws, err := svc.SetupDraws(ctx, g.ID)
	if err != nil {
		t.Fatalf("setup draws: %v", err)
	}
	// seatZeroFirstMove resolves in one round: the first contender (a) draws a blank and wins.
	if len(draws) != 2 {
		t.Fatalf("draws = %d, want 2 (one round, two players)", len(draws))
	}
	if draws[0].Account != a || !draws[0].Blank {
		t.Fatalf("draw[0] = %+v, want a having drawn a blank", draws[0])
	}
	if draws[1].Account != b {
		t.Fatalf("draw[1] account = %s, want b", draws[1].Account)
	}
}

// TestAutoMatchDrawBackfilledOnJoin checks an open auto-match game records the draw at open
// time against the synthetic opponent (a NULL account) and back-fills those rows to the real
// opponent when they join.
func TestAutoMatchDrawBackfilledOnJoin(t *testing.T) {
	ctx := context.Background()
	clearOpenGames(t)
	svc := newGameService()
	starter := provisionAccount(t)
	g := openGame(t, svc, starter, evenOpeningSeed(t))

	draws, err := svc.SetupDraws(ctx, g.ID)
	if err != nil {
		t.Fatalf("setup draws: %v", err)
	}
	if len(draws) != 2 {
		t.Fatalf("open draws = %d, want 2", len(draws))
	}
	var nullSeen, starterSeen bool
	for _, d := range draws {
		switch d.Account {
		case uuid.Nil:
			nullSeen = true
		case starter:
			starterSeen = true
		}
	}
	if !nullSeen || !starterSeen {
		t.Fatalf("open draws = %+v, want the starter and a NULL synthetic opponent", draws)
	}

	joiner := provisionAccount(t)
	if _, joined, err := svc.OpenOrJoin(ctx, joiner, openParams(0), time.Now().Add(time.Minute), nil); err != nil || !joined {
		t.Fatalf("join = (joined %v, err %v), want joined", joined, err)
	}
	after, err := svc.SetupDraws(ctx, g.ID)
	if err != nil {
		t.Fatalf("setup draws after join: %v", err)
	}
	for _, d := range after {
		if d.Account == uuid.Nil {
			t.Fatalf("draw still NULL after join: %+v", d)
		}
		if d.Account != starter && d.Account != joiner {
			t.Fatalf("draw account %s is neither player", d.Account)
		}
	}
}

// TestReplayTimeline checks the admin replay timeline reconstructs the dealt racks and one
// played move: the step count, the drawn tiles, the bag remainder, the running score and the
// turn cursor.
func TestReplayTimeline(t *testing.T) {
	ctx := context.Background()
	svc := newGameService()
	a := provisionAccount(t)
	b := provisionAccount(t)
	seed := evenOpeningSeed(t)
	g, err := svc.Create(ctx, game.CreateParams{Variant: engine.VariantEnglish, Seats: []uuid.UUID{a, b}, TurnTimeout: 24 * time.Hour, Seed: seed})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	hint, ok := newMirror(t, seed, 2).HintView()
	if !ok || len(hint.Tiles) == 0 {
		t.Fatal("no opening move for the seed")
	}
	if _, err := svc.SubmitPlay(ctx, g.ID, a, hint.Tiles); err != nil {
		t.Fatalf("play: %v", err)
	}

	tl, err := svc.ReplayTimeline(ctx, g.ID)
	if err != nil {
		t.Fatalf("replay timeline: %v", err)
	}
	if len(tl.Steps) != 2 {
		t.Fatalf("steps = %d, want 2 (deal + one move)", len(tl.Steps))
	}
	deal := tl.Steps[0]
	if deal.Move != nil {
		t.Fatalf("step 0 must be the deal, got move %+v", deal.Move)
	}
	rackSize := len(deal.Racks[0])
	if rackSize == 0 || len(deal.Racks) != 2 || len(deal.Racks[1]) != rackSize {
		t.Fatalf("deal racks = %v, want two equal full racks", deal.Racks)
	}
	move := tl.Steps[1]
	if move.Move == nil || move.Move.Action != "play" {
		t.Fatalf("step 1 move = %+v, want a play", move.Move)
	}
	if len(move.Drawn) != len(hint.Tiles) {
		t.Fatalf("drawn = %v, want %d refilled tiles", move.Drawn, len(hint.Tiles))
	}
	if move.BagLen != deal.BagLen-len(hint.Tiles) {
		t.Fatalf("bag after play = %d, want %d", move.BagLen, deal.BagLen-len(hint.Tiles))
	}
	if len(move.Racks[0]) != rackSize {
		t.Fatalf("mover rack after refill = %d, want %d", len(move.Racks[0]), rackSize)
	}
	if move.Scores[0] <= 0 {
		t.Fatalf("seat 0 score after play = %d, want > 0", move.Scores[0])
	}
	if move.ToMove != 1 {
		t.Fatalf("to_move after seat 0 play = %d, want 1", move.ToMove)
	}
}