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import { useState } from 'react';
import ToggleField from "../../../../components/ToggleField";
import Formula from "../../../../components/Formula";
import {fpsToMph, mphToFps, round} from "../../../../utils/Conversions";
import NumericField from "../../../../components/NumericField.jsx";

const numericFieldMapping = {
    speed: { description: "Speed:", placeholderText: "mph" },
    velocity: { description: "Velocity:", placeholderText: "fps" }
}

const toggleFieldDescriptions = {
    isSpeed: "Velocity to Speed / Speed to Velocity",
};

function SpeedAndVelocityPage() {

    const [fields, setFields] = useState({
        input: null,
        isSpeed: false,
    });

    const [result, setResult] = useState(null);

    const handleValueChange = (fieldName, newValue) => {
        console.log("input before: ", fields.input);
        setFields({...fields, [fieldName]: newValue });
        console.log("input after: ", fields.input);
    };

    // on toggle, set the value of the field to the other field's value and recalculate the result
    const handleToggle = (fieldName, newValue) => {
        if (result) {
            fields.isSpeed ? setResult(fpsToMph(fields.input)) :
                setResult(mphToFps(fields.input));
        }
        setFields({...fields, [fieldName]: newValue});
    }

    const toggleFields = Object.keys(toggleFieldDescriptions).map(fieldName => (
        <ToggleField
            key={fieldName}
            description={toggleFieldDescriptions[fieldName]}
            value={fields[fieldName]}
            onChange={(newValue) => handleToggle(fieldName, newValue)}
        />
    ));

    const fieldType = fields.isSpeed ? 'speed' : 'velocity';

    console.log(fields.input)

    // create a numeric field (as a map) for the given field type
    const numericFields = Object.keys(numericFieldMapping).map(fieldName => (
        fieldName === fieldType &&
        <NumericField
            key={fieldName}
            description={numericFieldMapping[fieldName].description}
            placeholderText={numericFieldMapping[fieldName].placeholderText}
            value={fields.input} // FIXME: this field is not being persisted on in the input field on toggle (shows null)
            onChange={(newValue) => handleValueChange("input", newValue)}
        />
    ));

    return (
        <div className={"container mb-5 center"}>
            <Formula
                formulaName={"Speed (mph) and Velocity (fps) Converter"}
                toggleFields={toggleFields}
                numericFields={numericFields}
                onCalculate={() => {
                    fields.isSpeed ? setResult(mphToFps(fields.input)) : setResult(fpsToMph(fields.input));
                }}
            />
            {result !== null && (
                <p>{fields.isSpeed ? "Velocity" : "Speed"}: {round(result)} {fields.isSpeed ? 'fps' : 'mph'}</p>
            )}
        </div>
    );
}

export default SpeedAndVelocityPage;
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