package game

import (
	"io"
	"testing"

	"thehouseoficarus/internal/behavior"
	"thehouseoficarus/internal/combat"
	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/player"
)

type nopConn struct{}

func (nopConn) ReadMessage() (string, error) { return "", io.EOF }
func (nopConn) Write(p []byte) (int, error)  { return len(p), nil }
func (nopConn) Close() error                 { return nil }
func (nopConn) SetEcho(bool) error           { return nil }

func newTestGame() *Game {
	return &Game{
		GlobalFlags:  NewGlobalFlagStore(),
		Combat:       combat.NewTracker(),
	}
}

func newTestGameWithStore(t *testing.T) *Game {
	g := newTestGame()
	g.AccountStore = player.NewAccountStore(t.TempDir())
	return g
}

func newTestSession(p *player.Player, acc *player.Account) *net.Session {
	if p.Options == nil {
		p.Options = make(map[string]any)
	}
	return &net.Session{Player: p, Conn: nopConn{}, State: net.StateGame, Account: acc}
}

func newTestPlayer(name string) *player.Player {
	return &player.Player{
		Name:    name,
		RoomID:  100,
		Skills:  map[player.SkillName]int{player.Hitpoints: player.XPForLevel(99)},
		HP:      50,
		Options: make(map[string]any),
	}
}

func TestRunInteractionNoMessagesAppliesInstantly(t *testing.T) {
	g := newTestGameWithStore(t)
	p := newTestPlayer("test")
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Heal: 10},
	}

	g.runInteraction(sess, p, step, 100, scopePlayer, nil)

	if p.Action != nil {
		t.Error("expected no pending action for message-less interaction")
	}
	if p.HP != 60 {
		t.Errorf("expected HP 60 after heal, got %d", p.HP)
	}
}

func TestRunInteractionWithMessagesStartsSequence(t *testing.T) {
	g := newTestGame()
	p := newTestPlayer("test")
	p.Credits = 100
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Credits: 50},
		Messages: []behavior.DelayedMessage{
			{Message: "You feel a strange energy.", Delay: 3},
		},
	}

	g.runInteraction(sess, p, step, 100, scopePlayer, nil)

	if p.Action == nil {
		t.Fatal("expected pending action for message-bearing interaction")
	}
	if p.Action.Type != behavior.TypeInteractionSeq {
		t.Errorf("expected TypeInteractionSeq, got %v", p.Action.Type)
	}
	if p.Action.WaitLeft != 3 {
		t.Errorf("expected WaitLeft 3, got %d", p.Action.WaitLeft)
	}
	if p.Credits != 100 {
		t.Errorf("expected credits unchanged (100), got %d", p.Credits)
	}
}

func TestAdvanceInteractionSeqDrainsZeroDelay(t *testing.T) {
	g := newTestGameWithStore(t)
	p := newTestPlayer("test")
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Heal: 10},
		Messages: []behavior.DelayedMessage{
			{Message: "First.", Delay: 0},
			{Message: "Second.", Delay: 0},
			{Message: "Third.", Delay: 0},
		},
	}

	g.startInteractionSeq(sess, p, step, 100, scopePlayer, nil)

	if p.Action == nil || p.Action.WaitLeft != 1 {
		t.Fatalf("expected WaitLeft 1 (delay 0 floored), got Action:%v", p.Action)
	}

	g.advanceInteractionSeq(sess, p)

	if p.Action != nil {
		t.Error("expected action cancelled after draining all messages")
	}
	if p.HP != 60 {
		t.Errorf("expected HP 60 after heal, got %d", p.HP)
	}
}

func TestAdvanceInteractionSeqHonorsDelay(t *testing.T) {
	g := newTestGameWithStore(t)
	p := newTestPlayer("test")
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Heal: 10},
		Messages: []behavior.DelayedMessage{
			{Message: "First.", Delay: 2},
			{Message: "Second.", Delay: 3},
		},
	}

	g.startInteractionSeq(sess, p, step, 100, scopePlayer, nil)

	if p.Action == nil || p.Action.WaitLeft != 2 {
		t.Fatalf("expected WaitLeft 2, got %v", p.Action)
	}
	p.Action.WaitLeft = 1

	g.advanceInteractionSeq(sess, p)

	if p.Action == nil {
		t.Fatal("expected action still running (second message pending)")
	}
	if p.Action.WaitLeft != 3 {
		t.Errorf("expected WaitLeft 3 (second message delay), got %d", p.Action.WaitLeft)
	}
	if p.HP != 50 {
		t.Error("heal should not have fired yet")
	}

	g.advanceInteractionSeq(sess, p)

	if p.Action != nil {
		t.Error("expected action cancelled after last message + heal")
	}
	if p.HP != 60 {
		t.Errorf("expected HP 60 after heal, got %d", p.HP)
	}
}

func TestInteractionSeqCancelPreventsTrailingEffects(t *testing.T) {
	g := newTestGame()
	p := newTestPlayer("test")
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Heal: 10},
		Messages: []behavior.DelayedMessage{
			{Message: "Hello.", Delay: 5},
		},
	}

	g.startInteractionSeq(sess, p, step, 100, scopePlayer, nil)

	if p.Action == nil {
		t.Fatal("expected pending action")
	}

	g.cancelAction(p)

	if p.Action != nil {
		t.Error("expected action to be cancelled")
	}
	if p.HP != 50 {
		t.Error("heal should not have fired after cancel")
	}
}

func TestApplyStepActionEmitsAllMessages(t *testing.T) {
	g := newTestGameWithStore(t)
	p := newTestPlayer("test")
	sess := newTestSession(p, nil)

	step := &behavior.StepAction{
		NodeAction: behavior.NodeAction{Heal: 10},
		Messages: []behavior.DelayedMessage{
			{Message: "A.", Delay: 99},
			{Message: "B.", Delay: 99},
		},
	}

	g.applyStepAction(sess, p, step, 100, scopePlayer, nil)

	if p.HP != 60 {
		t.Errorf("expected HP 60 after heal, got %d", p.HP)
	}
}