import { useState, memo } from 'react'
import api, { ModelInfo } from '../api/client'

const ModelRow = memo(function ModelRow({ m, onTest, onDelete }: {
  m: ModelInfo
  onTest: (id: string) => void
  onDelete: (id: string, name: string) => void
}) {
  return (
    <tr style={{
      borderBottom: '1px solid #f0f0f0',
      transition: 'background 0.15s ease',
    }}
    onMouseEnter={e => { e.currentTarget.style.background = '#fafbfc' }}
    onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
    >
      <td style={{ padding: '12px 12px', fontFamily: 'monospace', fontSize: 12, color: '#666' }}>{m.id}</td>
      <td style={{ padding: '12px 12px', fontWeight: 500, fontSize: 13 }}>{m.name}</td>
      <td style={{ padding: '12px 12px', fontSize: 13, color: '#666' }}>{m.model_type}</td>
      <td style={{ padding: '12px 12px' }}>
        <span style={{
          display: 'inline-block', padding: '3px 10px', borderRadius: 12, fontSize: 12, fontWeight: 500,
          background: m.is_downloaded ? '#f0fff4' : '#fff5f7',
          color: m.is_downloaded ? '#22863a' : '#e94560',
          border: `1px solid ${m.is_downloaded ? '#d1f0d8' : '#ffdce0'}`,
        }}>
          {m.is_downloaded ? '已缓存' : '未下载'}
        </span>
      </td>
      <td style={{ padding: '12px 12px', fontSize: 13, color: '#666' }}>{m.supported_peft_methods.join(', ') || '-'}</td>
      <td style={{ padding: '12px 12px' }}>
        {m.is_downloaded && (
          <button onClick={() => onTest(m.id)} style={{
            marginRight: 8, padding: '4px 12px', color: '#2196f3',
            border: '1px solid #2196f3', borderRadius: 6, background: 'transparent',
            cursor: 'pointer', fontSize: 12, fontWeight: 500, transition: 'all 0.15s ease',
          }}
          onMouseEnter={e => { e.currentTarget.style.background = '#2196f3'; e.currentTarget.style.color = '#fff' }}
          onMouseLeave={e => { e.currentTarget.style.background = 'transparent'; e.currentTarget.style.color = '#2196f3' }}
          >测试</button>
        )}
        <button onClick={() => onDelete(m.id, m.name)} style={{
          padding: '4px 12px', color: '#e94560', border: '1px solid #e94560',
          borderRadius: 6, background: 'transparent', cursor: 'pointer',
          fontSize: 12, fontWeight: 500, transition: 'all 0.15s ease',
        }}
        onMouseEnter={e => { e.currentTarget.style.background = '#e94560'; e.currentTarget.style.color = '#fff' }}
        onMouseLeave={e => { e.currentTarget.style.background = 'transparent'; e.currentTarget.style.color = '#e94560' }}
        >删除</button>
      </td>
    </tr>
  )
})

export function Models() {
  const [modelId, setModelId] = useState('')
  const [useModelscope, setUseModelscope] = useState(false)
  const [downloading, setDownloading] = useState(false)
  const [models, setModels] = useState<ModelInfo[]>([])
  const [loading, setLoading] = useState(false)
  const [statusMsg, setStatusMsg] = useState('')

  // Test state
  const [testModelId, setTestModelId] = useState('')
  const [testPrompt, setTestPrompt] = useState('')
  const [testResult, setTestResult] = useState('')
  const [testError, setTestError] = useState('')
  const [testing, setTesting] = useState(false)

  const fetchModels = () => {
    setLoading(true)
    api.models.list()
      .then(setModels)
      .catch(() => setModels([]))
      .finally(() => setLoading(false))
  }

  const handleDownload = () => {
    if (!modelId.trim()) return
    setDownloading(true)
    setStatusMsg('正在下载...')
    api.models.download(modelId, useModelscope)
      .then(res => setStatusMsg(`✅ ${res.model_id}: ${res.status}`))
      .catch(err => setStatusMsg(`❌ 下载失败: ${err.message}`))
      .finally(() => setDownloading(false))
  }

  const handleDelete = async (id: string, name: string) => {
    if (!confirm(`确定删除模型 "${name}"？这将删除本地所有相关文件。`)) return
    try {
      await api.models.delete(id)
      fetchModels()
    } catch (err) {
      const msg = err instanceof Error ? err.message : '删除失败'
      setStatusMsg(`❌ ${msg}`)
    }
  }

  const handleTest = async (id: string) => {
    setTestModelId(id)
    setTestPrompt('')
    setTestResult('')
    setTestError('')
    // Show test panel
    setTestPrompt('你好，请简单介绍一下自己。')
  }

  const handleTestSubmit = async () => {
    if (!testModelId.trim() || !testPrompt.trim()) return
    setTesting(true)
    setTestResult('')
    setTestError('')
    try {
      const res = await api.models.test({
        model_id: testModelId,
        prompt: testPrompt,
        max_new_tokens: 128,
        temperature: 0.8,
        top_p: 0.95,
      })
      setTestResult(res.generated_text)
    } catch (err) {
      const msg = err instanceof Error ? err.message : '测试失败'
      setTestError(msg)
    } finally {
      setTesting(false)
    }
  }

  return (
    <div>
      <h1 style={{ margin: 0, fontSize: 22, fontWeight: 700 }}>模型注册</h1>
      <p style={{ color: '#888', fontSize: 13, margin: '4px 0 16px' }}>下载和管理预训练模型</p>

      {/* Download form */}
      <div style={{
        marginTop: 16, background: '#fff', borderRadius: 10, padding: 20,
        boxShadow: '0 1px 3px rgba(0,0,0,0.06)', border: '1px solid rgba(0,0,0,0.04)',
      }}>
        <h2 style={{ margin: '0 0 12px', fontSize: 15, fontWeight: 600 }}>下载模型</h2>
        <div style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
          <input
            type="text"
            placeholder="输入模型 ID (如 meta-llama/Llama-3.1-8B)"
            value={modelId}
            onChange={e => setModelId(e.target.value)}
            style={{
              padding: '10px 14px', flex: 1, maxWidth: 400, borderRadius: 8,
              border: '1px solid #d0d0d0', fontSize: 14, outline: 'none',
              transition: 'border-color 0.2s',
            }}
            onFocus={e => { e.currentTarget.style.borderColor = '#e94560' }}
            onBlur={e => { e.currentTarget.style.borderColor = '#d0d0d0' }}
          />
          <label style={{ fontSize: 13, color: '#666', whiteSpace: 'nowrap', display: 'flex', alignItems: 'center', gap: 4, cursor: 'pointer' }}>
            <input type="checkbox" checked={useModelscope} onChange={e => setUseModelscope(e.target.checked)} />
            {' '}ModelScope
          </label>
          <button
            onClick={handleDownload}
            disabled={downloading}
            style={{
              padding: '10px 20px', borderRadius: 8, border: 'none',
              background: '#e94560', color: '#fff', cursor: 'pointer',
              opacity: downloading ? 0.6 : 1, fontSize: 14, fontWeight: 600,
              transition: 'all 0.2s ease',
            }}
          >
            {downloading ? '下载中...' : '下载模型'}
          </button>
        </div>
        {statusMsg && (
          <p style={{
            marginTop: 10, padding: '8px 12px', borderRadius: 6, fontSize: 13, margin: '10px 0 0',
            background: statusMsg.includes('❌') ? '#fff2f0' : '#f0fff4',
            color: statusMsg.includes('❌') ? '#cf1322' : '#22863a',
            border: `1px solid ${statusMsg.includes('❌') ? '#ffccc7' : '#d1f0d8'}`,
          }}>
            {statusMsg}
          </p>
        )}
      </div>

      {/* Model list */}
      <div style={{ marginTop: 24 }}>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 12 }}>
          <h2 style={{ margin: 0, fontSize: 15, fontWeight: 600 }}>已缓存模型</h2>
          <button onClick={fetchModels} style={{
            padding: '6px 14px', borderRadius: 6, border: '1px solid #d0d0d0',
            background: '#fff', cursor: 'pointer', fontSize: 13, fontWeight: 500,
            transition: 'all 0.15s ease',
          }}
          onMouseEnter={e => { e.currentTarget.style.background = '#f5f5f5' }}
          onMouseLeave={e => { e.currentTarget.style.background = '#fff' }}
          >
            刷新
          </button>
        </div>

        {loading && <p style={{ color: '#999', fontSize: 13 }}>加载中...</p>}

        {!loading && models.length === 0 && (
          <div style={{
            padding: 40, textAlign: 'center', color: '#999', fontSize: 14,
            background: '#fff', borderRadius: 10, boxShadow: '0 1px 3px rgba(0,0,0,0.06)',
          }}>
            <div style={{ fontSize: 32, marginBottom: 8 }}>🧠</div>
            暂无已缓存模型，请在上方下载模型
          </div>
        )}

        {!loading && models.length > 0 && (
          <div style={{
            background: '#fff', borderRadius: 10, overflow: 'hidden',
            boxShadow: '0 1px 3px rgba(0,0,0,0.06)', border: '1px solid rgba(0,0,0,0.04)',
          }}>
            <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 14 }}>
              <thead>
                <tr style={{ background: '#fafbfc', borderBottom: '2px solid #f0f0f0', textAlign: 'left' }}>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>ID</th>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>名称</th>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>类型</th>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>状态</th>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>PEFT 支持</th>
                  <th style={{ padding: '10px 12px', fontSize: 12, color: '#666', fontWeight: 600 }}>操作</th>
                </tr>
              </thead>
              <tbody>
                {models.map(m => (
                  <ModelRow key={m.id} m={m} onTest={handleTest} onDelete={handleDelete} />
                ))}
              </tbody>
            </table>
          </div>
        )}
      </div>

      {/* Test Panel */}
      {testModelId && (
        <div style={{
          marginTop: 24, background: '#fff', borderRadius: 12, padding: 24,
          boxShadow: '0 2px 8px rgba(0,0,0,0.08)', border: '1px solid rgba(0,0,0,0.04)',
        }}>
          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 20 }}>
            <h2 style={{ margin: 0, fontSize: 16, fontWeight: 600 }}>模型测试 — <code style={{ background: '#f5f5f5', padding: '2px 8px', borderRadius: 4, fontSize: 13 }}>{testModelId}</code></h2>
            <button onClick={() => { setTestModelId(''); setTestResult(''); setTestError(''); setTestPrompt('') }} style={{
              padding: '6px 14px', borderRadius: 6, border: '1px solid #d0d0d0',
              background: '#fff', cursor: 'pointer', fontSize: 13,
            }}>关闭</button>
          </div>

          {/* Chat-like input */}
          <div style={{ display: 'flex', gap: 8 }}>
            <input
              value={testPrompt}
              onChange={e => setTestPrompt(e.target.value)}
              onKeyDown={e => { if (e.key === 'Enter') handleTestSubmit() }}
              placeholder="输入提示词，按 Enter 发送..."
              style={{
                flex: 1, padding: '10px 14px', borderRadius: 8,
                border: '1px solid #d0d0d0', fontSize: 14, outline: 'none',
                transition: 'border-color 0.2s',
              }}
              onFocus={e => { e.currentTarget.style.borderColor = '#2196f3' }}
              onBlur={e => { e.currentTarget.style.borderColor = '#d0d0d0' }}
            />
            <button
              onClick={handleTestSubmit}
              disabled={testing}
              style={{
                padding: '10px 24px', borderRadius: 8, border: 'none',
                background: '#2196f3', color: '#fff', cursor: 'pointer',
                opacity: testing ? 0.6 : 1, whiteSpace: 'nowrap', fontSize: 14, fontWeight: 600,
                transition: 'all 0.2s ease',
              }}
            >
              {testing ? '生成中...' : '发送'}
            </button>
          </div>

          {/* Error */}
          {testError && (
            <div style={{ marginTop: 16, padding: 12, background: '#fff2f0', borderRadius: 8, color: '#cf1322', fontSize: 13, border: '1px solid #ffccc7' }}>
              {testError}
            </div>
          )}

          {/* Result */}
          {testResult && (
            <div style={{ marginTop: 16 }}>
              <div style={{ display: 'flex', gap: 8, marginBottom: 8 }}>
                <span style={{ fontSize: 12, color: '#666', fontWeight: 600 }}>Prompt</span>
              </div>
              <div style={{ padding: 14, background: '#f0f7ff', borderRadius: 8, fontSize: 14, lineHeight: 1.6, marginBottom: 16, border: '1px solid #d6e8fa' }}>
                {testPrompt}
              </div>
              <div style={{ display: 'flex', gap: 8, marginBottom: 8 }}>
                <span style={{ fontSize: 12, color: '#666', fontWeight: 600 }}>Response</span>
              </div>
              <div style={{ padding: 14, background: '#f0fff4', borderRadius: 8, fontSize: 14, lineHeight: 1.6, whiteSpace: 'pre-wrap', wordBreak: 'break-word', border: '1px solid #d1f0d8' }}>
                {testResult}
              </div>
            </div>
          )}
        </div>
      )}
    </div>
  )
}