package cn.infstar.magicgem.condition;

import cn.infstar.magicgem.config.LanguageManager;
import cn.infstar.magicgem.dsl.Directive;
import cn.infstar.magicgem.expression.DynamicExpression;
import cn.infstar.magicgem.item.ItemMatcher;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

import java.util.List;
import java.util.Locale;
import java.util.Map;

public final class ConditionEngine {
    private final DynamicExpression expressions;
    private final ItemMatcher itemMatcher;
    private final LanguageManager languages;

    public ConditionEngine(DynamicExpression expressions, ItemMatcher itemMatcher, LanguageManager languages) {
        this.expressions = expressions;
        this.itemMatcher = itemMatcher;
        this.languages = languages;
    }

    public CheckResult check(List<Directive> conditions, Player player, ItemStack item) {
        for (Directive condition : conditions) {
            CheckResult result = check(condition, player, item);
            if (!result.success()) return result;
        }
        return CheckResult.PASS;
    }

    public CheckResult check(Directive condition, Player player, ItemStack item) {
        String type = condition.type().toLowerCase(Locale.ROOT).replace("_", "");
        boolean passed;
        try {
            passed = switch (type) {
                case "papi", "expression" -> expressions.test(condition.argument("false", "p", "expression", "condition", "c"), player, item, Map.of());
                case "permission" -> player.hasPermission(condition.argument("", "p", "permission")) == condition.booleanArgument(true, "has");
                case "invempty" -> emptySlots(player) >= condition.intArgument(1, "amount");
                case "item", "require" -> itemMatcher.matches(item, condition.argument("", "type", "require", "r"));
                default -> false;
            };
        } catch (RuntimeException exception) {
            return new CheckResult(false, languages.text("cmagic.condition_parse", "&c条件解析失败: {condition}",
                    "condition", condition.source()));
        }
        return passed ? CheckResult.PASS : new CheckResult(false,
                condition.argument(languages.text("cmagic.condition_failed", "&c条件不满足: {condition}",
                        "condition", condition.type()), "tip", "message", "m"));
    }

    private int emptySlots(Player player) {
        int count = 0;
        for (ItemStack content : player.getInventory().getStorageContents())
            if (content == null || content.getType().isAir()) count++;
        return count;
    }

    public record CheckResult(boolean success, String message) {
        public static final CheckResult PASS = new CheckResult(true, "");
    }
}