import React, { useEffect, useState } from 'react';
import { Settings, X, RefreshCw, Cpu, Server, Key, AlertTriangle, Code } from 'lucide-react';
import { ModelSettings } from '../types';
import { AVAILABLE_TEXT_MODELS, AVAILABLE_IMAGE_MODELS } from '../constants';
import { fetchAvailableGeminiModels } from '../services/gemini/client';
import { fetchOpenAIModels } from '../services/openai/client';

interface SettingsModalProps {
  isOpen: boolean;
  onClose: () => void;
  modelSettings: ModelSettings;
  onUpdateSettings: (settings: ModelSettings) => void;
}

const SettingsModal: React.FC<SettingsModalProps> = ({ isOpen, onClose, modelSettings, onUpdateSettings }) => {
  const [loadingGoogleModels, setLoadingGoogleModels] = useState(false);
  const [loadingOpenAIModels, setLoadingOpenAIModels] = useState(false);
  const [openAIError, setOpenAIError] = useState<string | null>(null);

  useEffect(() => {
    if (isOpen && modelSettings.provider === 'google' && modelSettings.googleApiKey) {
        // Optional: auto-fetch on open if key exists? 
        // Better to let user click refresh to save quota/calls
    }
  }, [isOpen]);

  const loadDynamicGoogleModels = async () => {
      if (!modelSettings.googleApiKey) {
          alert("請先輸入 Google API Key");
          return;
      }
      setLoadingGoogleModels(true);
      try {
        const { textModels, imageModels } = await fetchAvailableGeminiModels(modelSettings.googleApiKey);
        if (textModels.length > 0 || imageModels.length > 0) {
            onUpdateSettings({
                ...modelSettings,
                availableTextModels: textModels,
                availableImageModels: imageModels
            });
        }
      } catch (e: any) {
          alert(`Google Models 更新失敗: ${e.message}`);
      } finally {
          setLoadingGoogleModels(false);
      }
  };

  const loadDynamicOpenAIModels = async () => {
      if (!modelSettings.openaiApiKey) {
          alert("請先輸入 API Key");
          return;
      }
      setLoadingOpenAIModels(true);
      setOpenAIError(null);
      try {
          const models = await fetchOpenAIModels(modelSettings.openaiBaseUrl, modelSettings.openaiApiKey);
          if (models.length > 0) {
              onUpdateSettings({
                  ...modelSettings,
                  availableOpenAIModels: models
              });
          } else {
              setOpenAIError("未找到可用模型，請檢查 URL 或 Key");
          }
      } catch (e: any) {
          console.error(e);
          setOpenAIError(e.message);
      } finally {
          setLoadingOpenAIModels(false);
      }
  };

  if (!isOpen) return null;

  const googleTextModels = modelSettings.availableTextModels?.length ? modelSettings.availableTextModels : AVAILABLE_TEXT_MODELS;
  const googleImageModels = modelSettings.availableImageModels?.length ? modelSettings.availableImageModels : AVAILABLE_IMAGE_MODELS;
  const openAIModels = modelSettings.availableOpenAIModels || [];

  return (
    <div className="fixed inset-0 bg-black/80 backdrop-blur-sm z-[100] flex items-center justify-center p-4">
      <div className="glass-card rounded-3xl w-full max-w-lg p-8 shadow-2xl relative animate-fade-in-up flex flex-col max-h-[90vh]">
        <button onClick={onClose} className="absolute top-4 right-4 text-zinc-500 hover:text-white">
          <X className="w-5 h-5" />
        </button>
        <h3 className="text-xl font-bold text-white mb-6 flex items-center gap-2">
          <Settings className="w-5 h-5 text-indigo-500" /> 系統設定 (System Settings)
        </h3>
        
        <div className="space-y-6 overflow-y-auto pr-2">
          
          {/* Provider Toggle */}
          <div className="bg-white/5 p-4 rounded-xl border border-white/10">
              <label className="text-xs font-bold text-zinc-400 mb-3 uppercase tracking-wider flex items-center gap-2">
                  <Cpu className="w-4 h-4" /> AI 推理供應商 (Inference Provider)
              </label>
              <div className="flex bg-black/40 rounded-lg p-1">
                  <button 
                      onClick={() => onUpdateSettings({ ...modelSettings, provider: 'google' })}
                      className={`flex-1 py-2 rounded-md text-sm font-bold transition-all ${modelSettings.provider === 'google' ? 'bg-indigo-500 text-white shadow-lg' : 'text-zinc-500 hover:text-zinc-300'}`}
                  >
                      Google Gemini
                  </button>
                  <button 
                      onClick={() => onUpdateSettings({ ...modelSettings, provider: 'openai' })}
                      className={`flex-1 py-2 rounded-md text-sm font-bold transition-all ${modelSettings.provider === 'openai' ? 'bg-indigo-500 text-white shadow-lg' : 'text-zinc-500 hover:text-zinc-300'}`}
                  >
                      OpenAI / Grok
                  </button>
              </div>
          </div>

          {modelSettings.provider === 'google' ? (
              // GOOGLE SETTINGS
              <div className="space-y-4 animate-fade-in">
                   <div>
                      <label className="block text-xs font-bold text-zinc-400 mb-2 uppercase tracking-wider flex items-center gap-2"><Key className="w-3 h-3" /> Google API Key</label>
                      <input 
                          type="password" 
                          className="glass-input w-full rounded-xl p-3 text-sm font-mono text-indigo-300" 
                          value={modelSettings.googleApiKey || ''}
                          onChange={(e) => onUpdateSettings({ ...modelSettings, googleApiKey: e.target.value })}
                          placeholder="AIza..."
                      />
                  </div>

                  <div className="relative">
                    <div className="flex justify-between items-center mb-2">
                         <label className="text-xs font-bold text-zinc-400 uppercase tracking-wider">語意分析引擎 (Text Model)</label>
                         <button onClick={loadDynamicGoogleModels} disabled={loadingGoogleModels} className="text-[10px] text-indigo-400 flex items-center gap-1 hover:text-indigo-300 bg-indigo-500/10 px-2 py-1 rounded">
                             <RefreshCw className={`w-3 h-3 ${loadingGoogleModels ? 'animate-spin' : ''}`} /> 
                             {loadingGoogleModels ? '抓取中...' : '刷新真實列表'}
                         </button>
                    </div>
                    <select
                      className="glass-input w-full rounded-xl p-3 text-sm bg-black"
                      value={modelSettings.textModel}
                      onChange={(e) => onUpdateSettings({ ...modelSettings, textModel: e.target.value })}
                    >
                      {googleTextModels.map(m => <option key={m.id} value={m.id} className="bg-zinc-900">{m.name}</option>)}
                    </select>
                  </div>
                  <div>
                    <label className="block text-xs font-bold text-zinc-400 mb-2 uppercase tracking-wider">視覺合成引擎 (Image Model)</label>
                    <select
                      className="glass-input w-full rounded-xl p-3 text-sm bg-black"
                      value={modelSettings.imageModel}
                      onChange={(e) => onUpdateSettings({ ...modelSettings, imageModel: e.target.value })}
                    >
                      {googleImageModels.map(m => <option key={m.id} value={m.id} className="bg-zinc-900">{m.name}</option>)}
                    </select>
                  </div>
              </div>
          ) : (
              // OPENAI / GROK SETTINGS
              <div className="space-y-4 animate-fade-in">
                  <div>
                      <label className="block text-xs font-bold text-zinc-400 mb-2 uppercase tracking-wider flex items-center gap-2"><Server className="w-3 h-3" /> API Base URL</label>
                      <input 
                          type="text" 
                          className="glass-input w-full rounded-xl p-3 text-sm font-mono text-emerald-300" 
                          value={modelSettings.openaiBaseUrl}
                          onChange={(e) => onUpdateSettings({ ...modelSettings, openaiBaseUrl: e.target.value })}
                          placeholder="https://api.x.ai/v1"
                      />
                      <p className="text-[10px] text-zinc-500 mt-1">例如: Grok (https://api.x.ai/v1), OpenAI (https://api.openai.com/v1)</p>
                  </div>
                  <div>
                      <label className="block text-xs font-bold text-zinc-400 mb-2 uppercase tracking-wider flex items-center gap-2"><Key className="w-3 h-3" /> API Key</label>
                      <input 
                          type="password" 
                          className="glass-input w-full rounded-xl p-3 text-sm font-mono" 
                          value={modelSettings.openaiApiKey}
                          onChange={(e) => onUpdateSettings({ ...modelSettings, openaiApiKey: e.target.value })}
                          placeholder="sk-..."
                      />
                  </div>
                  
                  <div className="relative">
                      <div className="flex justify-between items-center mb-2">
                           <label className="text-xs font-bold text-zinc-400 uppercase tracking-wider">Model Name</label>
                           <button onClick={loadDynamicOpenAIModels} disabled={loadingOpenAIModels} className="text-[10px] text-emerald-400 flex items-center gap-1 hover:text-emerald-300 bg-emerald-500/10 px-2 py-1 rounded">
                               <RefreshCw className={`w-3 h-3 ${loadingOpenAIModels ? 'animate-spin' : ''}`} /> 
                               {loadingOpenAIModels ? '抓取中...' : '刷新模型列表'}
                           </button>
                      </div>
                      
                      {openAIError && (
                          <div className="mb-2 text-[10px] text-red-400 flex items-center gap-1">
                              <AlertTriangle className="w-3 h-3" /> {openAIError}
                          </div>
                      )}

                      {openAIModels.length > 0 ? (
                          <select 
                              className="glass-input w-full rounded-xl p-3 text-sm bg-black"
                              value={modelSettings.openaiModel}
                              onChange={(e) => onUpdateSettings({ ...modelSettings, openaiModel: e.target.value })}
                          >
                              {openAIModels.map(m => (
                                  <option key={m.id} value={m.id} className="bg-zinc-900">{m.name}</option>
                              ))}
                          </select>
                      ) : (
                          <input 
                              type="text" 
                              className="glass-input w-full rounded-xl p-3 text-sm font-mono" 
                              value={modelSettings.openaiModel}
                              onChange={(e) => onUpdateSettings({ ...modelSettings, openaiModel: e.target.value })}
                              placeholder="grok-beta"
                          />
                      )}
                  </div>

                  <div className="bg-yellow-500/10 border border-yellow-500/30 p-3 rounded-lg text-xs text-yellow-200">
                      注意：OpenAI / Grok 僅用於「結構分析」與「文字生成」。圖像生成仍需依賴 Google Gemini Image Model (請上方輸入 Google Key)。
                  </div>
              </div>
          )}

          {/* DEV MODE Toggle */}
          <div className="bg-amber-500/10 border border-amber-500/30 p-4 rounded-xl">
              <label className="text-xs font-bold text-amber-300 mb-3 uppercase tracking-wider flex items-center gap-2">
                  <Code className="w-4 h-4" /> 開發模式 (DEV MODE)
              </label>
              <div className="flex items-center justify-between">
                  <div className="flex-1">
                      <p className="text-xs text-amber-200/80 mb-1">啟用後，圖片生成失敗時會自動使用隨機佔位圖片</p>
                      <p className="text-[10px] text-amber-300/60">Use placeholder images when generation fails</p>
                  </div>
                  <button
                      onClick={() => onUpdateSettings({ ...modelSettings, devMode: !modelSettings.devMode })}
                      className={`relative w-14 h-8 rounded-full transition-all duration-300 ${
                          modelSettings.devMode ? 'bg-amber-500' : 'bg-zinc-700'
                      }`}
                  >
                      <div className={`absolute top-1 left-1 w-6 h-6 bg-white rounded-full transition-transform duration-300 ${
                          modelSettings.devMode ? 'translate-x-6' : 'translate-x-0'
                      }`} />
                  </button>
              </div>
          </div>

        </div>
      </div>
    </div>
  );
};

export default SettingsModal;