'use client'

import { useState, useEffect, useCallback } from 'react'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card'
import { Button } from '@/components/ui/Button'
import { useToast } from '@/components/ui/Toast'
import {
  Bot,
  Eye,
  Mic,
  Settings,
  CheckCircle,
  XCircle,
  Loader2,
  Info,
  Shield,
  AlertTriangle,
  RefreshCw,
  Clock
} from 'lucide-react'
import { api } from '@/lib/api'
import { USE_MOCK } from '@/contexts/AuthContext'
import type { AIProvider, AIConfigResponse, ConnectionTestResponse, ModelInfo } from '@/types/ai-config'

// AI 提供商选项
const providerOptions: { value: AIProvider | string; label: string }[] = [
  { value: 'oneapi', label: 'OneAPI 中转服务' },
  { value: 'anthropic', label: 'Anthropic Claude' },
  { value: 'openai', label: 'OpenAI' },
  { value: 'deepseek', label: 'DeepSeek' },
  { value: 'qwen', label: '通义千问' },
  { value: 'doubao', label: '豆包' },
  { value: 'zhipu', label: '智谱' },
  { value: 'moonshot', label: 'Moonshot' },
]

// Mock 可用模型列表
const mockModels: Record<string, ModelInfo[]> = {
  text: [
    { id: 'claude-opus-4-5-20251101', name: 'Claude Opus 4.5' },
    { id: 'claude-sonnet-4-20250514', name: 'Claude Sonnet 4' },
    { id: 'gpt-4o', name: 'GPT-4o' },
    { id: 'deepseek-chat', name: 'DeepSeek Chat' },
  ],
  vision: [
    { id: 'claude-opus-4-5-20251101', name: 'Claude Opus 4.5' },
    { id: 'gpt-4o', name: 'GPT-4o' },
  ],
  audio: [
    { id: 'whisper-large-v3', name: 'Whisper Large V3' },
    { id: 'whisper-medium', name: 'Whisper Medium' },
  ],
}

type TestStatus = 'idle' | 'testing' | 'success' | 'failed'

function ConfigSkeleton() {
  return (
    <div className="space-y-6 animate-pulse">
      <div className="h-32 bg-bg-elevated rounded-lg" />
      <div className="h-48 bg-bg-elevated rounded-lg" />
      <div className="h-32 bg-bg-elevated rounded-lg" />
    </div>
  )
}

export default function AIConfigPage() {
  const toast = useToast()
  const [loading, setLoading] = useState(true)
  const [saving, setSaving] = useState(false)

  const [provider, setProvider] = useState<string>('oneapi')
  const [baseUrl, setBaseUrl] = useState('https://oneapi.intelligrow.cn')
  const [apiKey, setApiKey] = useState('')
  const [showApiKey, setShowApiKey] = useState(false)
  const [isConfigured, setIsConfigured] = useState(false)

  const [llmModel, setLlmModel] = useState('claude-opus-4-5-20251101')
  const [visionModel, setVisionModel] = useState('claude-opus-4-5-20251101')
  const [asrModel, setAsrModel] = useState('whisper-large-v3')

  const [temperature, setTemperature] = useState(0.7)
  const [maxTokens, setMaxTokens] = useState(2000)

  const [availableModels, setAvailableModels] = useState<Record<string, ModelInfo[]>>(mockModels)

  const [testResults, setTestResults] = useState<Record<string, { status: TestStatus; latency?: number; error?: string }>>({
    text: { status: 'idle' },
    vision: { status: 'idle' },
    audio: { status: 'idle' },
  })

  const loadConfig = useCallback(async () => {
    if (USE_MOCK) {
      setLoading(false)
      return
    }
    try {
      const config = await api.getAIConfig()
      setProvider(config.provider)
      setBaseUrl(config.base_url)
      setApiKey('') // API key is masked, don't fill it
      setIsConfigured(config.is_configured)
      setLlmModel(config.models.text)
      setVisionModel(config.models.vision)
      setAsrModel(config.models.audio)
      setTemperature(config.parameters.temperature)
      setMaxTokens(config.parameters.max_tokens)
      if (config.available_models && Object.keys(config.available_models).length > 0) {
        setAvailableModels(config.available_models)
      }
    } catch (err: any) {
      // 后端 404 返回 "AI 服务未配置" → Axios 拦截器转为 Error(message)
      // 这是正常的"尚未配置"状态，不弹错误
      const msg = err?.message || ''
      if (msg.includes('未配置')) {
        setIsConfigured(false)
      } else {
        console.error('Failed to load AI config:', err)
        toast.error('加载 AI 配置失败')
      }
    } finally {
      setLoading(false)
    }
  }, [toast])

  useEffect(() => { loadConfig() }, [loadConfig])

  const handleTestConnection = async () => {
    setTestResults({
      text: { status: 'testing' },
      vision: { status: 'testing' },
      audio: { status: 'testing' },
    })

    if (USE_MOCK) {
      await new Promise(resolve => setTimeout(resolve, 1500))
      setTestResults(prev => ({ ...prev, text: { status: 'success', latency: 320 } }))
      await new Promise(resolve => setTimeout(resolve, 1000))
      setTestResults(prev => ({ ...prev, vision: { status: 'success', latency: 450 } }))
      await new Promise(resolve => setTimeout(resolve, 800))
      setTestResults(prev => ({ ...prev, audio: { status: 'success', latency: 280 } }))
      return
    }

    try {
      const result: ConnectionTestResponse = await api.testAIConnection({
        provider: provider as AIProvider,
        base_url: baseUrl,
        api_key: apiKey || '***', // use existing key if not changed
        models: { text: llmModel, vision: visionModel, audio: asrModel },
      })
      const newResults: Record<string, { status: TestStatus; latency?: number; error?: string }> = {}
      for (const [key, r] of Object.entries(result.results)) {
        newResults[key] = {
          status: r.success ? 'success' : 'failed',
          latency: r.latency_ms ?? undefined,
          error: r.error ?? undefined,
        }
      }
      setTestResults(prev => ({ ...prev, ...newResults }))
      if (result.success) {
        toast.success(result.message)
      } else {
        toast.error(result.message)
      }
    } catch (err) {
      toast.error('连接测试失败')
      setTestResults({
        text: { status: 'failed', error: '请求失败' },
        vision: { status: 'failed', error: '请求失败' },
        audio: { status: 'failed', error: '请求失败' },
      })
    }
  }

  const handleSave = async () => {
    setSaving(true)
    try {
      if (USE_MOCK) {
        await new Promise(resolve => setTimeout(resolve, 500))
      } else {
        await api.updateAIConfig({
          provider: provider as AIProvider,
          base_url: baseUrl,
          api_key: apiKey || '***',
          models: { text: llmModel, vision: visionModel, audio: asrModel },
          parameters: { temperature, max_tokens: maxTokens },
        })
      }
      toast.success('配置已保存')
    } catch (err) {
      toast.error('保存失败')
    } finally {
      setSaving(false)
    }
  }

  const getTestStatusIcon = (key: string) => {
    const result = testResults[key]
    if (!result) return null
    switch (result.status) {
      case 'testing':
        return <Loader2 size={16} className="text-blue-500 animate-spin" />
      case 'success':
        return (
          <span className="flex items-center gap-1">
            <CheckCircle size={16} className="text-green-500" />
            {result.latency && <span className="text-xs text-text-tertiary">{result.latency}ms</span>}
          </span>
        )
      case 'failed':
        return (
          <span className="flex items-center gap-1">
            <XCircle size={16} className="text-red-500" />
            {result.error && <span className="text-xs text-accent-coral">{result.error}</span>}
          </span>
        )
      default:
        return null
    }
  }

  if (loading) {
    return (
      <div className="space-y-6 max-w-4xl">
        <h1 className="text-2xl font-bold text-text-primary">AI 服务配置</h1>
        <ConfigSkeleton />
      </div>
    )
  }

  return (
    <div className="space-y-6 max-w-4xl">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-text-primary">AI 服务配置</h1>
          <p className="text-sm text-text-secondary mt-1">配置 AI 服务提供商和模型参数</p>
        </div>
        {isConfigured && (
          <div className="flex items-center gap-2 px-3 py-1.5 rounded-lg bg-accent-green/15 border border-accent-green/30">
            <CheckCircle size={16} className="text-accent-green" />
            <span className="text-sm font-medium text-accent-green">已配置</span>
          </div>
        )}
      </div>

      {/* 配置继承提示 */}
      <div className="p-4 bg-accent-indigo/10 rounded-lg border border-accent-indigo/30">
        <div className="flex items-start gap-3">
          <Info size={20} className="text-accent-indigo flex-shrink-0 mt-0.5" />
          <div>
            <p className="text-sm text-accent-indigo font-medium">配置继承说明</p>
            <p className="text-sm text-accent-indigo/80 mt-1">
              品牌方配置后，所属代理商和达人将自动使用此配置。代理商和达人端不可见此配置项。
            </p>
          </div>
        </div>
      </div>

      {/* AI 提供商 */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Bot size={18} className="text-blue-500" />
            AI 提供商
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-text-primary mb-1">提供商选择</label>
            <select
              className="w-full px-3 py-2 border border-border-subtle rounded-lg bg-bg-elevated text-text-primary focus:outline-none focus:ring-2 focus:ring-accent-indigo"
              value={provider}
              onChange={(e) => setProvider(e.target.value)}
            >
              {providerOptions.map(opt => (
                <option key={opt.value} value={opt.value}>{opt.label}</option>
              ))}
            </select>
            <p className="text-xs text-text-tertiary mt-1">
              推荐使用 OneAPI 等中转服务商，方便切换不同 AI 模型
            </p>
          </div>
        </CardContent>
      </Card>

      {/* 模型配置 */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Settings size={18} className="text-purple-500" />
            模型配置
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-6">
          {/* 文字处理模型 */}
          <div className="p-4 bg-bg-elevated rounded-lg">
            <div className="flex items-center gap-2 mb-3">
              <Bot size={16} className="text-accent-indigo" />
              <span className="font-medium text-text-primary">文字处理模型 (LLM)</span>
              {getTestStatusIcon('text')}
            </div>
            <select
              className="w-full px-3 py-2 border border-border-subtle rounded-lg focus:outline-none focus:ring-2 focus:ring-accent-indigo bg-bg-card text-text-primary"
              value={llmModel}
              onChange={(e) => setLlmModel(e.target.value)}
            >
              {(availableModels.text || []).map(model => (
                <option key={model.id} value={model.id}>{model.name}</option>
              ))}
            </select>
            <p className="text-xs text-text-tertiary mt-2">用于 Brief 解析、语义分析、报告生成</p>
          </div>

          {/* 视频分析模型 */}
          <div className="p-4 bg-bg-elevated rounded-lg">
            <div className="flex items-center gap-2 mb-3">
              <Eye size={16} className="text-accent-green" />
              <span className="font-medium text-text-primary">视频分析模型 (Vision)</span>
              {getTestStatusIcon('vision')}
            </div>
            <select
              className="w-full px-3 py-2 border border-border-subtle rounded-lg focus:outline-none focus:ring-2 focus:ring-accent-indigo bg-bg-card text-text-primary"
              value={visionModel}
              onChange={(e) => setVisionModel(e.target.value)}
            >
              {(availableModels.vision || []).map(model => (
                <option key={model.id} value={model.id}>{model.name}</option>
              ))}
            </select>
            <p className="text-xs text-text-tertiary mt-2">用于画面语义分析、场景/风险识别</p>
          </div>

          {/* 音频解析模型 */}
          <div className="p-4 bg-bg-elevated rounded-lg">
            <div className="flex items-center gap-2 mb-3">
              <Mic size={16} className="text-orange-400" />
              <span className="font-medium text-text-primary">音频解析模型 (ASR)</span>
              {getTestStatusIcon('audio')}
            </div>
            <select
              className="w-full px-3 py-2 border border-border-subtle rounded-lg focus:outline-none focus:ring-2 focus:ring-accent-indigo bg-bg-card text-text-primary"
              value={asrModel}
              onChange={(e) => setAsrModel(e.target.value)}
            >
              {(availableModels.audio || []).map(model => (
                <option key={model.id} value={model.id}>{model.name}</option>
              ))}
            </select>
            <p className="text-xs text-text-tertiary mt-2">用于语音转文字、口播内容提取</p>
          </div>
        </CardContent>
      </Card>

      {/* 连接配置 */}
      <Card>
        <CardHeader>
          <CardTitle>连接配置</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-text-primary mb-1">Base URL</label>
            <input
              type="text"
              className="w-full px-3 py-2 border border-border-subtle rounded-lg bg-bg-elevated text-text-primary focus:outline-none focus:ring-2 focus:ring-accent-indigo"
              value={baseUrl}
              onChange={(e) => setBaseUrl(e.target.value)}
              placeholder="https://api.openai.com/v1"
            />
          </div>
          <div>
            <label className="block text-sm font-medium text-text-primary mb-1">API Key</label>
            <div className="flex gap-2">
              <input
                type={showApiKey ? 'text' : 'password'}
                className="flex-1 px-3 py-2 border border-border-subtle rounded-lg bg-bg-elevated text-text-primary focus:outline-none focus:ring-2 focus:ring-accent-indigo"
                value={apiKey}
                onChange={(e) => setApiKey(e.target.value)}
                placeholder={isConfigured ? '留空使用已保存的密钥' : 'sk-...'}
              />
              <Button
                variant="secondary"
                size="sm"
                onClick={() => setShowApiKey(!showApiKey)}
              >
                {showApiKey ? '隐藏' : '显示'}
              </Button>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* 生成参数 */}
      <Card>
        <CardHeader>
          <CardTitle>生成参数</CardTitle>
        </CardHeader>
        <CardContent className="space-y-6">
          <div>
            <div className="flex items-center justify-between mb-2">
              <label className="text-sm font-medium text-text-primary">Temperature</label>
              <span className="text-sm text-text-secondary">{temperature}</span>
            </div>
            <input
              type="range"
              min="0"
              max="1"
              step="0.1"
              value={temperature}
              onChange={(e) => setTemperature(parseFloat(e.target.value))}
              className="w-full h-2 bg-bg-elevated rounded-lg appearance-none cursor-pointer accent-accent-indigo"
            />
            <div className="flex justify-between text-xs text-text-tertiary mt-1">
              <span>精确 (0)</span>
              <span>创意 (1)</span>
            </div>
          </div>
          <div>
            <label className="block text-sm font-medium text-text-primary mb-2">Max Tokens</label>
            <input
              type="number"
              className="w-32 px-3 py-2 border border-border-subtle rounded-lg bg-bg-elevated text-text-primary focus:outline-none focus:ring-2 focus:ring-accent-indigo"
              value={maxTokens}
              onChange={(e) => setMaxTokens(parseInt(e.target.value))}
              min="100"
              max="8000"
            />
          </div>
        </CardContent>
      </Card>

      {/* 安全说明 */}
      <div className="p-4 bg-bg-elevated rounded-lg border border-border-subtle">
        <div className="flex items-start gap-3">
          <Shield size={20} className="text-text-tertiary flex-shrink-0 mt-0.5" />
          <div className="text-sm text-text-secondary">
            <p className="font-medium text-text-primary mb-1">安全说明</p>
            <ul className="space-y-1 text-xs">
              <li>• API Key 使用 AES-256-GCM 加密存储</li>
              <li>• 所有 API 请求强制使用 HTTPS</li>
              <li>• 仅品牌方管理员可查看/修改此配置</li>
              <li>• 配置变更将被记录</li>
            </ul>
          </div>
        </div>
      </div>

      {/* 操作按钮 */}
      <div className="flex items-center justify-between pt-4 border-t border-border-subtle">
        <Button variant="secondary" onClick={handleTestConnection}>
          测试连接
        </Button>
        <Button onClick={handleSave} disabled={saving}>
          {saving ? <><Loader2 size={16} className="animate-spin" /> 保存中...</> : '保存配置'}
        </Button>
      </div>
    </div>
  )
}