import React, { useCallback, useMemo, useState } from 'react';
import { Box, Button, Input, Text, config } from 'folds';
import { MatrixClient } from 'matrix-js-sdk';
import {
  PaarrotUiActionContent,
  PaarrotUiButtonNode,
  PaarrotUiContent,
  PaarrotUiNode,
} from '../../../types/matrix/room';
import { mxcUrlToHttp } from '../../utils/matrix';
import { isAllowedRoomAppImageSrc, scopeRoomAppCss } from './sanitizeRoomAppCss';
import * as css from './RoomAppView.css';

const SCOPE = '[data-room-app]';

type RoomAppSchemaProps = {
  mx: MatrixClient;
  content: PaarrotUiContent;
  uiEventId?: string;
  useAuthentication: boolean;
  onAction: (payload: PaarrotUiActionContent) => void | Promise<void>;
};

function fieldName(node: { id: string; name?: string }): string {
  return node.name || node.id;
}

function spacerSize(size?: number): 'sm' | 'md' | 'lg' {
  if (typeof size === 'number' && size <= 8) return 'sm';
  if (typeof size === 'number' && size >= 24) return 'lg';
  return 'md';
}

export function RoomAppSchema({
  mx,
  content,
  uiEventId,
  useAuthentication,
  onAction,
}: RoomAppSchemaProps) {
  const [values, setValues] = useState<Record<string, string>>({});
  const [sending, setSending] = useState(false);

  const scopedCss = useMemo(
    () => (content.css ? scopeRoomAppCss(content.css, SCOPE) : ''),
    [content.css]
  );

  const setField = useCallback((name: string, value: string) => {
    setValues((prev) => ({ ...prev, [name]: value }));
  }, []);

  const handleButton = useCallback(
    async (node: PaarrotUiButtonNode) => {
      if (node.disabled || sending) return;
      setSending(true);
      try {
        await onAction({
          action: node.action,
          component_id: node.id,
          value: node.value,
          values: { ...values },
          ui_event_id: uiEventId,
        });
      } finally {
        setSending(false);
      }
    },
    [onAction, sending, uiEventId, values]
  );

  const renderNode = (node: PaarrotUiNode): React.ReactNode => {
    switch (node.type) {
      case 'panel':
        return (
          <div key={node.id} className={css.Panel} data-room-app-node={node.id}>
            {node.children?.map((child) => renderNode(child))}
          </div>
        );
      case 'row':
        return (
          <div key={node.id} className={css.Row} data-room-app-node={node.id}>
            {node.children?.map((child) => renderNode(child))}
          </div>
        );
      case 'text':
        return (
          <Text
            key={node.id}
            as="p"
            size="T400"
            className={node.className}
            data-room-app-node={node.id}
          >
            {node.text ?? ''}
          </Text>
        );
      case 'button': {
        const variant = node.variant ?? 'Primary';
        return (
          <Button
            key={node.id}
            type="button"
            size="400"
            variant={variant}
            radii="300"
            disabled={node.disabled || sending}
            onClick={() => handleButton(node)}
            data-room-app-node={node.id}
          >
            <Text size="B400">{node.label}</Text>
          </Button>
        );
      }
      case 'input': {
        const name = fieldName(node);
        const current = values[name] ?? node.value ?? '';
        return (
          <div key={node.id} className={css.Field} data-room-app-node={node.id}>
            {node.label && (
              <Text as="label" size="L400" htmlFor={`room-app-${node.id}`}>
                {node.label}
              </Text>
            )}
            <Input
              id={`room-app-${node.id}`}
              name={name}
              variant="Background"
              radii="300"
              type={node.inputType ?? 'text'}
              placeholder={node.placeholder}
              value={current}
              onChange={(evt) => setField(name, evt.currentTarget.value)}
            />
          </div>
        );
      }
      case 'select': {
        const name = fieldName(node);
        const current = values[name] ?? node.value ?? '';
        return (
          <div key={node.id} className={css.Field} data-room-app-node={node.id}>
            {node.label && (
              <Text as="label" size="L400" htmlFor={`room-app-${node.id}`}>
                {node.label}
              </Text>
            )}
            <Box as="span" grow="Yes" style={{ position: 'relative' }}>
              <select
                id={`room-app-${node.id}`}
                name={name}
                value={current}
                onChange={(evt) => setField(name, evt.currentTarget.value)}
                style={{
                  width: '100%',
                  padding: `${config.space.S200} ${config.space.S300}`,
                  borderRadius: config.radii.R300,
                  border: '1px solid var(--bq-border, CurrentColor)',
                  background: 'transparent',
                  color: 'inherit',
                  font: 'inherit',
                }}
              >
                {(node.options ?? []).map((opt) => (
                  <option key={opt.value} value={opt.value}>
                    {opt.label}
                  </option>
                ))}
              </select>
            </Box>
          </div>
        );
      }
      case 'image': {
        if (!isAllowedRoomAppImageSrc(node.src)) return null;
        const httpSrc = node.src.startsWith('mxc://')
          ? mxcUrlToHttp(mx, node.src, useAuthentication) ?? undefined
          : node.src;
        if (!httpSrc) return null;
        return (
          <img
            key={node.id}
            className={css.Image}
            src={httpSrc}
            alt={node.alt ?? ''}
            width={node.width}
            height={node.height}
            data-room-app-node={node.id}
          />
        );
      }
      case 'spacer':
        return <div key={node.id} className={css.Spacer({ size: spacerSize(node.size) })} />;
      default:
        return null;
    }
  };

  return (
    <div data-room-app="">
      {scopedCss ? <style>{scopedCss}</style> : null}
      {renderNode(content.root)}
    </div>
  );
}