<?php
namespace Game\Modules;

use Game\Core\Game;
use Game\Core\Screen;
use Game\Core\Input;
use Game\Entities\Item;
use Game\Entities\Partner;

class NpcPanel
{
    private array $npcs;

    public function __construct(public Game $game)
    {
        $this->npcs = require __DIR__ . '/../../src/Data/npcs.php';
    }

    public function show()
    {
        while (true) {
            Screen::clear($this->game->output);
            $this->game->output->writeln("========== 拜访故人 ==========");
            
            // Filter NPCs based on level
            $availableNpcs = [];
            foreach ($this->npcs as $npc) {
                if ($this->game->player->level >= $npc['min_level']) {
                    $availableNpcs[] = $npc;
                }
            }

            if (empty($availableNpcs)) {
                $this->game->output->writeln("目前没有故人可以拜访。");
            } else {
                foreach ($availableNpcs as $index => $npc) {
                    $idx = $index+1;
                    $this->game->output->writeln("[{$idx}] {$npc['name']} <{$npc['title']}>");
                }
            }

            $this->game->output->writeln("==============================");
            $this->game->output->writeln("[0] 返回");

            $choice = Input::ask($this->game->output, "请选择故人: ");

            if ($choice == 0) {
                $this->game->state = Game::MENU;
                return;
            }

            if (isset($availableNpcs[$choice-1])) {
                $this->interact($availableNpcs[$choice-1]);
            } else {
                $this->game->output->writeln("无效选择");
                Screen::sleep(1);
            }
        }
    }

    private function interact(array $npc)
    {
        while (true) {
            Screen::clear($this->game->output);
            $this->game->output->writeln("========== {$npc['name']} ==========");
            $this->game->output->writeln($npc['desc']);
            $this->game->output->writeln("------------------------------");
            
            $actions = $npc['actions'] ?? [];
            $actionKeys = array_keys($actions);
            
            foreach ($actionKeys as $idx => $key) {
                $label = match($key) {
                    'talk' => '交谈',
                    'gift' => '领取赠礼',
                    'trade' => '交易',
                    'heal' => '疗伤',
                    'buff' => '强化',
                    'recruit' => '邀请入队',
                    default => ucfirst($key)
                };

                // 如果已招募，显示不同文本
                if ($key === 'recruit' && isset($this->game->player->partners[$npc['id']])) {
                    $label = '已入队 ✓';
                }

                $this->game->output->writeln("[{$idx}] {$label}");
            }

            $this->game->output->writeln("[0] 离开");

            $choice = Input::ask($this->game->output, "请选择: ");

            if ($choice == 0) return;
            
            if (isset($actionKeys[$choice])) {
                $actionType = $actionKeys[$choice];
                $actionData = $actions[$actionType];
                $this->handleAction($actionType, $actionData, $npc);
                Screen::pause($this->game->output);
            }
        }
    }

    private function handleAction(string $type, array $data, array $npc)
    {
        switch ($type) {
            case 'talk':
                $this->game->output->writeln("{$npc['name']}: \"{$data['text']}\"");
                break;

            case 'recruit':
                $this->handleRecruit($data, $npc);
                break;

            case 'heal':
                $this->game->output->writeln("{$npc['name']}: \"{$data['text']}\"");
                $healAmount = $this->game->player->maxHp - $this->game->player->hp;
                if ($healAmount > 0) {
                    $this->game->player->hp = $this->game->player->maxHp;
                    $this->game->output->writeln("你的生命值已恢复满！");
                } else {
                    $this->game->output->writeln("你状态很好，无需治疗。");
                }
                break;
                
            case 'gift':
                // Check if already received (need storage for this state, maybe in player save data?)
                // For simplicity, let's just give it for now, or check inventory?
                // Real implementation should save received gifts in player data.
                // Let's assume we can give it repeatedly for now or add a simple check if I can modify Player class.
                // I'll modify Player class to store 'npc_flags'.
                
                $flag = "gift_{$npc['id']}";
                if (isset($this->game->player->npcFlags[$flag])) {
                    $this->game->output->writeln("{$npc['name']}: \"东西已经给你了，别太贪心。\"");
                    return;
                }

                $this->game->output->writeln("{$npc['name']}: \"{$data['text']}\"");
                if (isset($data['item_spec'])) {
                    $item = Item::createFromSpec($data['item_spec'], $this->game->player->level);
                    $this->game->player->addItem($item);
                    $this->game->output->writeln("获得了 [{$item['name']}]！");
                    $this->game->player->npcFlags[$flag] = true;
                }
                break;
                
            case 'trade':
                $this->game->output->writeln("{$npc['name']}: \"{$data['text']}\"");
                $this->trade($data['items']);
                break;
        }
    }

    private function trade(array $items)
    {
        // Simple trade implementation
        $index = 1;
        foreach ($items as $idx => $itemInfo) {
            $index++;
            $this->game->output->writeln("[{$index}] {$itemInfo['name']} - {$itemInfo['price']} 灵石");
        }
        $this->game->output->writeln("[0] 取消");

        $choice = Input::ask($this->game->output, "购买: ");
        if (isset($items[$choice-1])) {
            $itemInfo = $items[$choice];
            if ($this->game->player->spiritStones >= $itemInfo['price']) {
                $this->game->player->spiritStones -= $itemInfo['price'];
                // Create item. Since trade items in config are simple, we might need randomItem or createFromSpec
                // For now assuming simple items, use randomItem logic or createFromSpec if detailed
                // The config has 'type' and 'name'.
                $spec = ['type' => $itemInfo['type'], 'name' => $itemInfo['name']];
                $item = Item::createFromSpec($spec, $this->game->player->level);
                $this->game->player->addItem($item);
                $this->game->output->writeln("购买了 [{$item['name']}]！");
            } else {
                $this->game->output->writeln("灵石不足！");
            }
        }
    }

    /**
     * 处理招募同伴
     */
    private function handleRecruit(array $data, array $npc)
    {
        $player = $this->game->player;

        // 检查是否已招募
        if (isset($player->partners[$npc['id']])) {
            $this->game->output->writeln("{$npc['name']}: \"我已经在队伍中了！\"");
            return;
        }

        // 检查是否有base_stats（可招募的NPC必须有）
        if (!isset($npc['base_stats'])) {
            $this->game->output->writeln("{$npc['name']}: \"我还有其他事要忙，不能与你同行。\"");
            return;
        }

        // 检查队伍是否已满
        if (count($player->partners) >= $player->maxPartners) {
            $this->game->output->writeln("队伍已满！最多只能携带 {$player->maxPartners} 名同伴。");
            return;
        }

        // 检查招募费用
        $cost = $data['cost'] ?? 0;
        if ($cost > 0 && $player->spiritStones < $cost) {
            $this->game->output->writeln("灵石不足！需要 {$cost} 灵石。");
            return;
        }

        // 显示招募对话
        $this->game->output->writeln("{$npc['name']}: \"{$data['text']}\"");
        $this->game->output->writeln("");

        // 显示同伴属性预览
        $stats = $npc['base_stats'];
        $this->game->output->writeln("========== 同伴属性 ==========");
        $patk = $stats['patk'] ?? $stats['atk'] ?? 10;
        $matk = $stats['matk'] ?? 5;
        $pdef = $stats['pdef'] ?? $stats['def'] ?? 5;
        $mdef = $stats['mdef'] ?? 3;
        $this->game->output->writeln("生命: {$stats['hp']}  物攻: {$patk}  魔攻: {$matk}");
        $this->game->output->writeln("物防: {$pdef}  魔防: {$mdef}");
        $this->game->output->writeln("暴击: {$stats['crit']}%  暴伤: {$stats['critdmg']}%");
        $this->game->output->writeln("成长: {$stats['growth']}x");
        $this->game->output->writeln("==============================");

        if ($cost > 0) {
            $this->game->output->writeln("招募费用: {$cost} 灵石");
        }
        $this->game->output->writeln("");

        $confirm = Input::ask($this->game->output, "确认招募？[y/n]: ");
        if (strtolower($confirm) !== 'y') {
            $this->game->output->writeln("取消招募。");
            return;
        }

        // 扣除费用
        if ($cost > 0) {
            $player->spendSpiritStones($cost);
        }

        // 创建同伴并添加到队伍
        $partner = new Partner([
            'id' => $npc['id'],
            'name' => $npc['name'],
            'level' => 1,
            'exp' => 0,
            'baseStats' => $npc['base_stats'],
            'equip' => [],
            'talentWeights' => $npc['talent_weights'] ?? [
                'hp' => 1, 'patk' => 1, 'matk' => 1, 'pdef' => 1, 'mdef' => 1, 'crit' => 1, 'critdmg' => 1
            ],
        ]);

        $player->recruitPartner($partner);
        $this->game->saveState();

        $this->game->output->writeln("");
        $this->game->output->writeln("★ {$npc['name']} 加入了队伍！");
    }
}