package hacking

import (
	"strings"
	"testing"
)

// Regression: round resolution (challenge and exact calls) passed an
// already-used strings.Builder BY VALUE into checkGameOver, panicking with
// "illegal use of non-zero Builder copied by value" on ordinary input — a
// forced challenge resolves on the very first bid. A panic here runs on the
// game owner goroutine, which has no recovery, so it terminated the server.
// See building_guide/concurrency.md for the owner's no-recovery guarantee.

func TestLiarsDiceForcedChallengeDoesNotPanic(t *testing.T) {
	g := NewLiarsDiceGame()
	g.Init(1)
	// An impossible bid deterministically forces an immediate AI challenge.
	out, _, _ := g.HandleInput("bid 100 6")
	if !strings.Contains(out, "Actual count") {
		t.Fatalf("challenge output missing the reveal: %q", out)
	}
	if !strings.Contains(out, "You lose a fragment") && !strings.Contains(out, "System loses a fragment") {
		t.Fatalf("challenge did not resolve a fragment loss: %q", out)
	}
}

func TestLiarsDiceCallAndExactResolveWithoutPanic(t *testing.T) {
	// Call path: bid, let the system raise, then challenge it.
	g := NewLiarsDiceGame()
	g.Init(1)
	if out, _, _ := g.HandleInput("bid 2 3"); out == "" {
		t.Fatal("opening bid produced no output")
	}
	if out, _, _ := g.HandleInput("call"); out == "" {
		t.Fatal("call produced no output")
	}

	// Exact path: bid, let the system raise, then claim exact.
	g = NewLiarsDiceGame()
	g.Init(1)
	if out, _, _ := g.HandleInput("bid 2 3"); out == "" {
		t.Fatal("opening bid produced no output")
	}
	if out, _, _ := g.HandleInput("exact"); out == "" {
		t.Fatal("exact produced no output")
	}
}

func TestLiarsDiceFullLossGameResolvesWithoutPanic(t *testing.T) {
	// Bid high enough that the system always calls and the player always
	// loses a fragment, driving the game to its terminal resolution.
	g := NewLiarsDiceGame()
	g.Init(1)
	for i := 0; i < 10; i++ {
		out, done, won := g.HandleInput("bid 100 6")
		if done {
			if won {
				t.Fatal("all-in losing bids cannot win")
			}
			return
		}
		if out == "" {
			t.Fatal("round produced no output")
		}
	}
	t.Fatal("game did not terminate within 10 forced-loss rounds")
}