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//      Magicbane Emulator Project © 2013 - 2026
//                https://www.magicbane.com

package engine.parsers.wpak;

import engine.parsers.cache.CacheParserUtil;
import org.pmw.tinylog.Logger;

import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

// One non-comment line of a wpak cfg file, split into tokens.
// Every accessor that fails names the file and line.

public class WpakLine {

    // The client reads numbers like C atoi/atof: the leading number counts, the rest is dropped
    // (Powers.cfg has "2.9.0" for a float and "10.0" for an int)
    private static final Pattern intPrefix = Pattern.compile("[-+]?\\d+");
    private static final Pattern floatPrefix = Pattern.compile("[-+]?(\\d+\\.?\\d*|\\.\\d+)");

    public final String fileName;
    public final int lineNumber;
    public final String text;
    public final ArrayList<String> tokens;

    public WpakLine(String fileName, int lineNumber, String text, ArrayList<String> tokens) {
        this.fileName = fileName;
        this.lineNumber = lineNumber;
        this.text = text;
        this.tokens = tokens;
    }

    public String location() {
        return fileName + ":" + lineNumber;
    }

    public WpakFormatException error(String message) {
        return new WpakFormatException(location() + ": " + message);
    }

    public int size() {
        return tokens.size();
    }

    public boolean has(int index) {
        return index < tokens.size();
    }

    public String token(int index) {

        if (!has(index))
            throw error("missing token " + index + " in '" + text.trim() + "'");

        return tokens.get(index);
    }

    public int intToken(int index) {

        String value = token(index);
        Matcher prefix;

        try {
            return Integer.parseInt(value);
        } catch (NumberFormatException e) {
            prefix = intPrefix.matcher(value);
        }

        if (!prefix.lookingAt())
            throw error("token " + index + " '" + value + "' is not an integer");

        Logger.warn(location() + ": token " + index + " '" + value + "' read as " + prefix.group() + ", as the client does");
        return Integer.parseInt(prefix.group());
    }

    public float floatToken(int index) {

        String value = token(index);
        Matcher prefix;

        try {
            return Float.parseFloat(value);
        } catch (NumberFormatException e) {
            prefix = floatPrefix.matcher(value);
        }

        if (!prefix.lookingAt())
            throw error("token " + index + " '" + value + "' is not a number");

        Logger.warn(location() + ": token " + index + " '" + value + "' read as " + prefix.group() + ", as the client does");
        return Float.parseFloat(prefix.group());
    }

    // The client reads a missing trailing number as 0 (String::ToInt on an empty token)

    public int optionalIntToken(int index) {

        if (!has(index))
            return 0;

        return intToken(index);
    }

    // TRUE/FALSE, or a number where non-zero is true

    public boolean boolToken(int index) {

        String value = token(index);

        if (value.equalsIgnoreCase("TRUE"))
            return true;

        if (value.equalsIgnoreCase("FALSE"))
            return false;

        try {
            return Integer.parseInt(value) != 0;
        } catch (NumberFormatException e) {
            throw error("token " + index + " '" + value + "' is not a boolean");
        }
    }

    public boolean optionalBoolToken(int index) {

        if (!has(index))
            return false;

        return boolToken(index);
    }

    public ArrayList<Integer> intTokensFrom(int index) {

        ArrayList<Integer> values = new ArrayList<>();

        for (int i = index; i < tokens.size(); i++)
            values.add(intToken(i));

        return values;
    }

    public <E extends Enum<E>> E enumToken(Class<E> enumClass, int index) {

        String value = token(index);
        String name = CacheParserUtil.enumName(value);

        for (E constant : enumClass.getEnumConstants())
            if (constant.name().equalsIgnoreCase(name))
                return constant;

        throw error("token " + index + " '" + value + "' has no " + enumClass.getSimpleName());
    }
}