import React, { useState, useCallback } from 'react';
import { Box, Text } from 'ink';
import TextInput from 'ink-text-input';
import type { ParsedCommand } from '@mosaic/types';
import { parseSlashCommand, commandRegistry } from '../commands/index.js';

export interface InputBarProps {
  onSubmit: (value: string) => void;
  onSystemMessage?: (message: string) => void;
  onLocalCommand?: (parsed: ParsedCommand) => void;
  onGatewayCommand?: (parsed: ParsedCommand) => void;
  isStreaming: boolean;
  connected: boolean;
  placeholder?: string;
}

export function InputBar({
  onSubmit,
  onSystemMessage,
  onLocalCommand,
  onGatewayCommand,
  isStreaming,
  connected,
  placeholder: placeholderOverride,
}: InputBarProps) {
  const [input, setInput] = useState('');

  const handleSubmit = useCallback(
    (value: string) => {
      if (!value.trim() || isStreaming || !connected) return;

      const trimmed = value.trim();

      if (trimmed.startsWith('/')) {
        const parsed = parseSlashCommand(trimmed);
        if (!parsed) {
          onSystemMessage?.(`Unknown command format: ${trimmed}`);
          setInput('');
          return;
        }
        const def = commandRegistry.find(parsed.command);
        if (!def) {
          onSystemMessage?.(
            `Unknown command: /${parsed.command}. Type /help for available commands.`,
          );
          setInput('');
          return;
        }
        if (def.execution === 'local') {
          onLocalCommand?.(parsed);
          setInput('');
          return;
        }
        // Gateway-executed commands
        onGatewayCommand?.(parsed);
        setInput('');
        return;
      }

      onSubmit(value);
      setInput('');
    },
    [onSubmit, onSystemMessage, onLocalCommand, onGatewayCommand, isStreaming, connected],
  );

  const placeholder =
    placeholderOverride ??
    (!connected
      ? 'disconnected — waiting for gateway…'
      : isStreaming
        ? 'waiting for response…'
        : 'message mosaic…');

  return (
    <Box paddingX={1} borderStyle="single" borderColor="gray">
      <Text bold color="green">
        {'❯ '}
      </Text>
      <TextInput
        value={input}
        onChange={setInput}
        onSubmit={handleSubmit}
        placeholder={placeholder}
      />
    </Box>
  );
}