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package com.skillw.pouvoir.util.read;

import org.jetbrains.annotations.NotNull;

import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

public class StrTrie implements Parser {
    final Char c;
    private final HashMap> children = new HashMap<>();
    T target = null;

    public StrTrie() {
        this.c = new Char(' ');
    }

    public StrTrie(Char c) {
        this.c = c;
    }

    @Override
    public int hashCode() {
        return this.c.c;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof StrTrie)) {
            return false;
        }
        StrTrie node = (StrTrie) o;
        return this.c == (node.c);
    }

    public void put(String name, T target) {
        StrTrie node = this;
        int index = 0;
        while (index < name.length()) {
            char ch = name.charAt(index++);
            Char c = new Char(ch);
            node = node.children.computeIfAbsent(c, (cc) -> new StrTrie<>(c));
        }
        node.target = target;
    }

    @NotNull
    @Override
    public Result parse(String text) {
        StrTrie node = this;
        int index = 0;
        int start = -1;
        while (index < text.length()) {
            Char c = new Char(text.charAt(index++));
            StrTrie next = node.children.get(c);
            if (next != null) {
                if (start == -1) {
                    start = index - 1;
                }
                node = next;
                if (node.target != null && (index == text.length() || !node.children.containsKey(new Char(text.charAt(index))))) {
                    return new Result<>(this, text).setResult(node.target).setRange(start, index);
                }
            } else {
                start = -1;
            }
        }
        return new Result<>();
    }

    public Map serialize() {
        HashMap map = new LinkedHashMap<>();
        map.put("char", this.c.c);
        map.put("children", Arrays.asList(this.children.values().stream().map(StrTrie::serialize).toArray()));
        map.put("target", (this.target == null) ? "null" : this.target.toString());
        return map;
    }

    @Override
    public String toString() {
        return this.serialize().toString();
    }
}