<?php
namespace Game\System;

use Game\Event\Event;
use Game\Event\EventDispatcher;
use Game\Model\DialogueNode;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Helper\QuestionHelper;
use Symfony\Component\Console\Question\Question;

use Game\Event\EventListenerInterface; // ⭐ Add import

/**
 * DialogueService: 负责处理对话树的流程逻辑和交互。
 */
class DialogueService implements EventListenerInterface {

    private EventDispatcher $dispatcher;
    private StateManager $stateManager; // ⭐ Add StateManager
    private InputInterface $input;
    private OutputInterface $output;
    private QuestionHelper $helper;

    private array $currentDialogueTree = [];
    private string $currentNodeId = '';

    public function __construct(EventDispatcher $dispatcher, StateManager $stateManager, InputInterface $input, OutputInterface $output, QuestionHelper $helper) {
        $this->dispatcher = $dispatcher;
        $this->stateManager = $stateManager;
        $this->input = $input;
        $this->output = $output;
        $this->helper = $helper;
    }

    public function handleEvent(Event $event): void {
        switch ($event->getType()) {
            case 'StartDialogueEvent':
                $dialogue = $event->getPayload()['dialogue'];
                $this->startDialogue($dialogue);
                break;
            case 'DialogueChoice': // ⭐ Listen for choice event
                $choice = $event->getPayload()['choice'];
                $this->handleChoice($choice);
                break;
        }
    }

    /**
     * 开始一段对话 (非阻塞，初始化状态)
     */
    public function startDialogue(array $dialogueTree): void {
        $this->currentDialogueTree = $dialogueTree;
        $this->currentNodeId = 'root';
        
        // 切换游戏模式
        $this->stateManager->setMode(StateManager::MODE_DIALOGUE);

        // 显示第一个节点
        $this->displayCurrentNode();
    }

    private function displayCurrentNode(): void {
        if (!isset($this->currentDialogueTree[$this->currentNodeId])) {
            $this->endDialogue();
            return;
        }

        $nodeData = $this->currentDialogueTree[$this->currentNodeId];
        $node = DialogueNode::fromArray($this->currentNodeId, $nodeData);

        $this->output->writeln("\n<fg=cyan>🗣️  对话</>");
        $this->output->writeln("<fg=white>" . str_repeat("-", 40) . "</>");
        $lines = explode("\n", $node->text);
        foreach ($lines as $line) {
            $this->output->writeln(" " . trim($line));
        }
        $this->output->writeln("<fg=white>" . str_repeat("-", 40) . "</>\n");

        if (empty($node->options)) {
             $this->output->writeln(" [按回车键或输入任意值结束]");
        } else {
             foreach ($node->options as $index => $option) {
                $this->output->writeln(" [<fg=yellow>{$index}</>] {$option['text']}");
            }
        }
    }

    /**
     * 处理玩家选择
     */
    private function handleChoice(string $input): void {
        if (!isset($this->currentDialogueTree[$this->currentNodeId])) {
            $this->endDialogue();
            return;
        }

        $nodeData = $this->currentDialogueTree[$this->currentNodeId];
        $node = DialogueNode::fromArray($this->currentNodeId, $nodeData);
        
        // 如果没有选项，任意输入都结束对话 (或者跳转 next)
        if (empty($node->options)) {
             $this->endDialogue();
             return;
        }

        if (!is_numeric($input)) {
            $this->output->writeln("<fg=red>输入无效，请输入选项数字。</>");
            // 这里不需要循环，直接返回，等待下一次输入事件
            return; 
        }

        $index = (int)$input;
        if (!isset($node->options[$index])) {
            $this->output->writeln("<fg=red>选项不存在。</>");
            return;
        }

        // 处理选中项
        $selectedOption = $node->options[$index];

        // 1. 执行动作
        if (!empty($selectedOption['action'])) {
            $this->handleAction($selectedOption['action']);
        }

        // 2. 跳转
        if (empty($selectedOption['next'])) {
            $this->endDialogue();
        } else {
            $this->currentNodeId = $selectedOption['next'];
            $this->displayCurrentNode();
        }
    }

    private function endDialogue(): void {
        $this->currentDialogueTree = [];
        $this->currentNodeId = '';
        $this->output->writeln("\n[对话结束]");
        
        // 恢复地图模式 (或者之前的模式，稍微简化处理)
        $this->stateManager->setMode(StateManager::MODE_MAP);
    }

    private function handleAction(string $actionString): void {
        $parts = explode(':', $actionString, 2);
        $actionType = $parts[0];
        $payload = $parts[1] ?? null;

        switch ($actionType) {
            case 'accept_quest':
                if ($payload) {
                    $this->dispatcher->dispatch(new Event('QuestAcceptRequest', ['questId' => $payload]));
                }
                break;
            case 'open_shop':
                 if ($payload) {
                    $this->dispatcher->dispatch(new Event('OpenShopEvent', ['npcId' => $payload]));
                 }
                 break;
        }
    }
}