import { useState } from 'react'
import { IconFilter, IconTable, IconForms } from '@tabler/icons-react'
import type { A2UIBlock } from '../lib/types'

interface A2UIRendererProps {
  block: A2UIBlock
  onAction?: (action: string, data: Record<string, unknown>) => void
}

// ─── Filters ─────────────────────────────────────────────────────────────────

function FiltersRenderer({ block, onAction }: A2UIRendererProps & { block: Extract<A2UIBlock, { type: 'filters' }> }) {
  const [activeLabels, setActiveLabels] = useState<Set<string>>(new Set())

  function handleToggle(label: string) {
    const isActive = activeLabels.has(label)
    setActiveLabels(prev => {
      const next = new Set(prev)
      if (isActive) next.delete(label)
      else next.add(label)
      return next
    })
    onAction?.('filter_toggle', { label, active: !isActive })
  }

  return (
    <div
      className='tool-call-card'
      style={{ display: 'flex', flexWrap: 'wrap', gap: '0.4rem', alignItems: 'center' }}
    >
      <IconFilter size={16} color='#7aa2f7' style={{ marginRight: 4 }} />
      {block.filters.map(option => {
        const active = activeLabels.has(option.label)
        return (
          <button
            key={option.value}
            onClick={() => handleToggle(option.label)}
            style={{
              padding: '0.3rem 0.6rem',
              borderRadius: '12px',
              border: '1px solid',
              borderColor: active ? '#5a7aba' : '#3a3a5a',
              background: active ? '#2a3a6a' : 'transparent',
              color: active ? '#ffffff' : '#8888aa',
              fontSize: '0.8rem',
              cursor: 'pointer',
            }}
          >
            {option.label}
          </button>
        )
      })}
    </div>
  )
}

// ─── Table ───────────────────────────────────────────────────────────────────

function TableRenderer({ block }: { block: Extract<A2UIBlock, { type: 'table' }> }) {
  return (
    <div className='tool-call-card' style={{ overflowX: 'auto' }}>
      <div style={{ display: 'flex', alignItems: 'center', gap: '0.4rem', marginBottom: '0.4rem' }}>
        <IconTable size={16} color='#7aa2f7' />
        <span style={{ color: '#8888aa', fontSize: '0.8rem' }}>Data Table</span>
      </div>
      <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: '0.8rem' }}>
        <thead>
          <tr>
            {block.headers.map((header, i) => (
              <th
                key={i}
                style={{
                  textAlign: 'left',
                  padding: '0.3rem 0.5rem',
                  borderBottom: '1px solid #2a2a4a',
                  color: '#aaaacc',
                  fontWeight: 600,
                }}
              >
                {header}
              </th>
            ))}
          </tr>
        </thead>
        <tbody>
          {block.rows.map((row, ri) => (
            <tr key={ri}>
              {row.map((cell, ci) => (
                <td
                  key={ci}
                  style={{
                    padding: '0.3rem 0.5rem',
                    borderBottom: '1px solid #1a1a2e',
                    color: '#c0c0d0',
                  }}
                >
                  {cell}
                </td>
              ))}
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  )
}

// ─── Cards ───────────────────────────────────────────────────────────────────

function CardsRenderer({ block }: { block: Extract<A2UIBlock, { type: 'cards' }> }) {
  return (
    <div
      style={{
        display: 'grid',
        gridTemplateColumns: 'repeat(auto-fill, minmax(200px, 1fr))',
        gap: '0.5rem',
        margin: '0.5rem 0',
      }}
    >
      {block.items.map((item, i) => (
        <div
          key={i}
          className='tool-call-card'
          style={{ cursor: item.url ? 'pointer' : undefined }}
          onClick={item.url ? () => window.open(item.url, '_blank') : undefined}
        >
          <div style={{ fontWeight: 600, color: '#e0e0e0' }}>{item.title}</div>
          {item.price != null && (
            <div style={{ color: '#7af7a2', fontWeight: 600, fontSize: '0.9rem' }}>{item.price}</div>
          )}
          {item.description && (
            <div style={{ color: '#8888aa', fontSize: '0.75rem', marginTop: 4 }}>{item.description}</div>
          )}
        </div>
      ))}
    </div>
  )
}

// ─── Form ────────────────────────────────────────────────────────────────────

function FormRenderer({
  block,
  onAction,
}: {
  block: Extract<A2UIBlock, { type: 'form' }>
  onAction?: (action: string, data: Record<string, unknown>) => void
}) {
  function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault()
    const formData = new FormData(e.currentTarget)
    const data: Record<string, unknown> = {}
    formData.forEach((value, key) => {
      data[key] = value
    })
    onAction?.('form_submit', data)
  }

  const inputStyle: React.CSSProperties = {
    width: '100%',
    padding: '0.3rem',
    background: '#1e2a4a',
    border: '1px solid #3a3a5a',
    borderRadius: '4px',
    color: '#e0e0e0',
    fontSize: '0.8rem',
    boxSizing: 'border-box',
  }

  return (
    <div className='tool-call-card'>
      <div style={{ display: 'flex', alignItems: 'center', gap: '0.4rem', marginBottom: '0.4rem' }}>
        <IconForms size={16} color='#7aa2f7' />
        <span style={{ color: '#8888aa', fontSize: '0.8rem' }}>Input Form</span>
      </div>
      <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: '0.4rem' }}>
        {block.fields.map(field => (
          <div key={field.name}>
            <label style={{ fontSize: '0.75rem', color: '#8888aa', display: 'block' }}>
              {field.label || field.name}
            </label>
            {field.type === 'select' ? (
              <select name={field.name} style={inputStyle}>
                {field.options?.map(opt => (
                  <option key={opt.value} value={opt.value}>
                    {opt.label}
                  </option>
                ))}
              </select>
            ) : (
              <input name={field.name} type={field.type} style={inputStyle} />
            )}
          </div>
        ))}
        <button
          type='submit'
          style={{
            padding: '0.4rem 0.8rem',
            background: '#3a5aba',
            color: '#ffffff',
            border: 'none',
            borderRadius: '4px',
            cursor: 'pointer',
            fontSize: '0.8rem',
            marginTop: '0.3rem',
            alignSelf: 'flex-start',
          }}
        >
          {block.submitLabel || 'Submit'}
        </button>
      </form>
    </div>
  )
}

// ─── Main Renderer ───────────────────────────────────────────────────────────

export function A2UIRenderer({ block, onAction }: A2UIRendererProps) {
  switch (block.type) {
    case 'filters':
      return <FiltersRenderer block={block} onAction={onAction} />
    case 'table':
      return <TableRenderer block={block} />
    case 'cards':
      return <CardsRenderer block={block} />
    case 'form':
      return <FormRenderer block={block} onAction={onAction} />
    default:
      return null
  }
}