package net.knarcraft.ffmpegconverter.parser;

import net.knarcraft.ffmpegconverter.utility.ListUtil;

/**
 * A class representing a command argument
 */
public class ConverterArgument {

    private final String name;
    private final char shorthand;
    private final boolean valueRequired;
    private final ConverterArgumentValueType valueType;

    /**
     * Instantiates a converter argument
     *
     * @param name          <p>The name of the argument which users has to type.</p>
     * @param shorthand     <p>A single character value for using the command.</p>
     * @param valueRequired <p>Whether the argument must be followed by a valid value.</p>
     * @param valueType     <p>The type of value the argument requires.</p>
     */
    public ConverterArgument(String name, char shorthand, boolean valueRequired, ConverterArgumentValueType valueType) {
        this.name = name;
        this.shorthand = shorthand;
        this.valueRequired = valueRequired;
        this.valueType = valueType;
    }

    /**
     * Gets the argument name
     *
     * @return <p>The argument name.</p>
     */
    public String getName() {
        return name;
    }

    /**
     * Gets the argument shorthand
     *
     * @return <p>The argument shorthand</p>
     */
    public char getShorthand() {
        return shorthand;
    }

    /**
     * Gets whether the argument requires a value
     *
     * @return <p>Whether the argument requires a value.</p>
     */
    public boolean isValueRequired() {
        return valueRequired;
    }

    /**
     * Tests whether the given value is valid for this converter argument
     *
     * @param value <p>The value to test.</p>
     * @return <p>True if the argument is valid. False otherwise.</p>
     */
    public boolean testArgumentValue(String value) {
        if (value.isEmpty()) {
            return !valueRequired;
        }
        if (valueRequired && value.startsWith("-")) {
            return false;
        }
        switch (valueType) {
            case BOOLEAN:
                String lower = value.toLowerCase();
                return lower.equals("true") || lower.equals("false");
            case COMMA_SEPARATED_LIST:
                ListUtil.getListFromCommaSeparatedString(value);
                return true;
            case STRING:
                return true;
            case INT:
                try {
                    Integer.parseInt(value);
                    return true;
                } catch (NumberFormatException exception) {
                    return false;
                }
        }
        return false;
    }

}