import { FC, useEffect, useState } from 'react';
import { LocalizeText, WiredFurniType } from '../../../../api';
import { Text } from '../../../../common';
import { useWired } from '../../../../hooks';
import { OctaneInput } from '../../../../layout';
import { WiredExtraBaseView } from './WiredExtraBaseView';
import { Checkbox } from '../../../../common/Checkbox';
import { NativeTextTree } from '../../../../common/native-text/NativeTextTree';

const MAX_NAME_LENGTH = 40;

const normalizeVariableName = (value: string) => {
    let normalizedValue = (value ?? '').replace(/[\t\r\n]/g, '');

    if (normalizedValue.includes('=')) normalizedValue = normalizedValue.substring(0, normalizedValue.indexOf('=')).trim();

    while (normalizedValue.startsWith('@') || normalizedValue.startsWith('~')) {
        normalizedValue = normalizedValue.substring(1);
    }

    normalizedValue = normalizedValue.replace(/\s+/g, '_');
    normalizedValue = normalizedValue.replace(/[^A-Za-z0-9_]/g, '');

    return normalizedValue.slice(0, MAX_NAME_LENGTH);
};

const handleVariableNameKeyDown = (event: React.KeyboardEvent<HTMLInputElement>, setValue: (value: string) => void) => {
    if (event.key !== ' ') return;

    event.preventDefault();

    const input = event.currentTarget;
    const start = input.selectionStart ?? input.value.length;
    const end = input.selectionEnd ?? start;
    const nextValue = `${input.value.substring(0, start)}_${input.value.substring(end)}`;

    setValue(normalizeVariableName(nextValue));

    window.requestAnimationFrame(() => input.setSelectionRange(Math.min(start + 1, input.value.length + 1), Math.min(start + 1, input.value.length + 1)));
};

export const WiredExtraContextVariableView: FC<{}> = () => {
    const { trigger = null, setIntParams = null, setStringParam = null } = useWired();
    const [variableName, setVariableName] = useState('');
    const [hasValue, setHasValue] = useState(false);

    useEffect(() => {
        if (!trigger) return;

        setVariableName(normalizeVariableName(trigger.stringData));
        setHasValue(trigger.intData.length > 0 ? trigger.intData[0] === 1 : false);
    }, [trigger]);

    const save = () => {
        setStringParam(normalizeVariableName(variableName));
        setIntParams([hasValue ? 1 : 0]);
    };

    return (
        <NativeTextTree>
            <WiredExtraBaseView hasSpecialInput={true} requiresFurni={WiredFurniType.STUFF_SELECTION_OPTION_NONE} save={save} cardStyle={{ width: 400 }}>
                <div className="flex flex-col gap-2">
                    <div className="flex flex-col gap-1">
                        <Text>{LocalizeText('wiredfurni.params.variables.variable_name')}</Text>
                        <OctaneInput
                            maxLength={MAX_NAME_LENGTH}
                            type="text"
                            value={variableName}
                            onChange={(event) => setVariableName(normalizeVariableName(event.target.value))}
                            onKeyDown={(event) => handleVariableNameKeyDown(event, setVariableName)}
                        />
                    </div>

                    <div className="flex flex-col gap-1">
                        <Text>{LocalizeText('wiredfurni.params.variables.settings')}</Text>
                        <label className="flex items-center gap-1 cursor-pointer">
                            <Checkbox checked={hasValue} onCheckedChange={(nextChecked) => setHasValue(nextChecked)} />
                            <Text>{LocalizeText('wiredfurni.params.variables.settings.has_value')}</Text>
                        </label>
                    </div>
                </div>
            </WiredExtraBaseView>
        </NativeTextTree>
    );
};