"use client";

import { useCallback, useMemo, useState } from "react";

import { toolGroups } from "@/config/tools";
import * as baselib from "@/lib/base";
import { Input, InputProps } from "@/components/ui/input";
import { PasteButton } from "@/components/buttons/paste";
import { Configuration } from "@/components/configuration";
import { Configurations } from "@/components/configurations";
import { ControlMenu } from "@/components/control-menu";
import { icons } from "@/components/icons";
import { LabeledSwitch } from "@/components/labeled-switch";
import { PageRootSection } from "@/components/page-root-section";
import { PageSection } from "@/components/page-section";

const baseConfig = {
  10: { prefix: "", validate: baselib.isDecimal },
  16: { prefix: "0x", validate: baselib.isHexadecimal },
  8: { prefix: "0o", validate: baselib.isOctal },
  2: { prefix: "0b", validate: baselib.isBinary },
} as const;

export default function Page() {
  const [format, setFormat] = useState(true);
  const [int, setInt] = useState<bigint | undefined>(BigInt(42));

  const newDec = int?.toString(10) ?? "";
  const newHex = int?.toString(16).toUpperCase() ?? "";
  const newOct = int?.toString(8) ?? "";
  const newBin = int?.toString(2) ?? "";

  const dec = format ? baselib.formatDecimal(newDec) : newDec;
  const hex = format ? baselib.formatHexadecimal(newHex) : newHex;
  const oct = format ? baselib.formatOctal(newOct) : newOct;
  const bin = format ? baselib.formatBinary(newBin) : newBin;

  const trySetInt = (base: 10 | 16 | 8 | 2) => (value: string) => {
    if (value === "") {
      return setInt(undefined);
    }

    const { prefix, validate } = baseConfig[base];
    const unformatted = baselib.unformatNumber(value);

    if (validate(unformatted)) {
      setInt(BigInt(`${prefix}${unformatted}`));
    }
  };

  const trySetDec = useCallback((value: string) => trySetInt(10)(value), []);
  const trySetHex = useCallback((value: string) => trySetInt(16)(value), []);
  const trySetOct = useCallback((value: string) => trySetInt(8)(value), []);
  const trySetBin = useCallback((value: string) => trySetInt(2)(value), []);

  const onDecChange: InputProps["onChange"] = ({ currentTarget: { value } }) => trySetDec(value);
  const onHexChange: InputProps["onChange"] = ({ currentTarget: { value } }) => trySetHex(value);
  const onOctChange: InputProps["onChange"] = ({ currentTarget: { value } }) => trySetOct(value);
  const onBinChange: InputProps["onChange"] = ({ currentTarget: { value } }) => trySetBin(value);

  const formatNumberIcon = useMemo(() => <icons.CaseSensitive size={24} />, []);

  const formatNumberConfig = useMemo(
    () => (
      <Configuration
        icon={formatNumberIcon}
        title="Format number"
        control={
          <LabeledSwitch
            id="format-number-switch"
            label={format ? "On" : "Off"}
            checked={format}
            onCheckedChange={setFormat}
            aria-label="toggle whether to format numbers"
          />
        }
      />
    ),
    [format, formatNumberIcon]
  );

  const decPasteButton = useMemo(() => <PasteButton onClipboardRead={trySetDec} />, [trySetDec]);
  const hexPasteButton = useMemo(() => <PasteButton onClipboardRead={trySetHex} />, [trySetHex]);
  const octPasteButton = useMemo(() => <PasteButton onClipboardRead={trySetOct} />, [trySetOct]);
  const binPasteButton = useMemo(() => <PasteButton onClipboardRead={trySetBin} />, [trySetBin]);

  const decControl = <ControlMenu list={[decPasteButton]} />;
  const hexControl = <ControlMenu list={[hexPasteButton]} />;
  const octControl = <ControlMenu list={[octPasteButton]} />;
  const binControl = <ControlMenu list={[binPasteButton]} />;

  return (
    <PageRootSection title={toolGroups.converters.tools.numberBase.longTitle}>
      <PageSection className="mb-6" title="Configuration">
        <Configurations list={[formatNumberConfig]} />
      </PageSection>
      <PageSection title="Decimal" control={decControl}>
        <Input value={dec} onChange={onDecChange} />
      </PageSection>
      <PageSection title="Hexadecimal" control={hexControl}>
        <Input value={hex} onChange={onHexChange} />
      </PageSection>
      <PageSection title="Octal" control={octControl}>
        <Input value={oct} onChange={onOctChange} />
      </PageSection>
      <PageSection title="Binary" control={binControl}>
        <Input value={bin} onChange={onBinChange} />
      </PageSection>
    </PageRootSection>
  );
}