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import React, { useState, useEffect, useCallback } from 'react';
import { WrenchIcon, PlusCircleIcon, ToolboxIcon, InfoIcon, Trash2Icon, SparklesIcon, BookOpenIcon, CheckCircleIcon } from '../components/icons';
import Spinner from '../components/Spinner';
import { generateToolGuide, generateMaintenanceTips, isAIConfigured } from '../services/geminiService';
import type { ToolRecommendation, UserTool, MaintenanceTips } from '../types';
import { AppStatus, ToolCondition } from '../types';
import { useLocalStorage } from '../hooks/useLocalStorage';


const ToolGuideView: React.FC = () => {
    const [status, setStatus] = useState<AppStatus>(AppStatus.IDLE);
    const [toolData, setToolData] = useState<ToolRecommendation[] | null>(null);
    const [myToolkit, setMyToolkit] = useLocalStorage<UserTool[]>('user-toolkit', []);
    const [error, setError] = useState<string>('');
    const [activeTab, setActiveTab] = useState<'encyclopedia' | 'toolkit'>('encyclopedia');
    
    const [modalOpen, setModalOpen] = useState(false);
    const [modalContent, setModalContent] = useState<{toolName: string, tips: MaintenanceTips} | null>(null);
    const [modalLoading, setModalLoading] = useState(false);
    const aiConfigured = isAIConfigured();

    useEffect(() => {
        const fetchToolGuide = async () => {
            if (!aiConfigured) {
                setStatus(AppStatus.ERROR);
                setError('Please set your Gemini API key in Settings to load the tool encyclopedia.');
                return;
            }
            setStatus(AppStatus.ANALYZING);
            try {
                const result = await generateToolGuide();
                if (result) {
                    setToolData(result);
                    setStatus(AppStatus.SUCCESS);
                } else {
                    throw new Error('Failed to load tool encyclopedia. The AI may be busy. Please try again.');
                }
            } catch (e: any) {
                setError(e.message);
                setStatus(AppStatus.ERROR);
            }
        };
        fetchToolGuide();
    }, [aiConfigured]);

    const handleAddToToolkit = (tool: ToolRecommendation) => {
        const newUserTool: UserTool = {
            ...tool,
            id: `${tool.name}-${Date.now()}`,
            condition: ToolCondition.GOOD,
        };
        setMyToolkit(prev => [...prev, newUserTool]);
    };

    const handleRemoveFromToolkit = (toolId: string) => {
        setMyToolkit(prev => prev.filter(t => t.id !== toolId));
    };

    const handleUpdateTool = (toolId: string, updatedProps: Partial<UserTool>) => {
        setMyToolkit(prev => prev.map(t => t.id === toolId ? { ...t, ...updatedProps } : t));
    }
    
    const handleShowMaintenanceTips = async (tool: UserTool) => {
        setModalOpen(true);
        setModalLoading(true);
        try {
            const tips = await generateMaintenanceTips(tool.name);
            if (tips) {
                setModalContent({ toolName: tool.name, tips });
            } else {
                 throw new Error("Could not retrieve tips.");
            }
        } catch(e: any) {
             setModalContent({
                toolName: tool.name,
                tips: { sharpening: e.message, cleaning: "Could not retrieve tips.", storage: "Could not retrieve tips."}
            });
        } finally {
            setModalLoading(false);
        }
    };

    const isToolInKit = (toolName: string) => myToolkit.some(t => t.name === toolName);
    
    const conditionColors: Record<ToolCondition, { bg: string, text: string, ring: string }> = {
        [ToolCondition.EXCELLENT]: { bg: 'bg-green-100', text: 'text-green-800', ring: 'ring-green-600' },
        [ToolCondition.GOOD]: { bg: 'bg-blue-100', text: 'text-blue-800', ring: 'ring-blue-600' },
        [ToolCondition.NEEDS_SHARPENING]: { bg: 'bg-yellow-100', text: 'text-yellow-800', ring: 'ring-yellow-600' },
        [ToolCondition.NEEDS_OILING]: { bg: 'bg-orange-100', text: 'text-orange-800', ring: 'ring-orange-600' },
        [ToolCondition.DAMAGED]: { bg: 'bg-red-100', text: 'text-red-800', ring: 'ring-red-600' },
    };

    const renderEncyclopedia = () => {
        if (status === AppStatus.ANALYZING) return <Spinner text="Yuki is organizing the tool shed..." />;
        if (status === AppStatus.ERROR) return <p className="text-center text-red-600 p-4 bg-red-50 rounded-md">{error}</p>;
        if (!toolData) return null;

        const groupedTools = toolData.reduce((acc, tool) => {
            acc[tool.category] = acc[tool.category] || [];
            acc[tool.category].push(tool);
            return acc;
        }, {} as Record<ToolRecommendation['category'], ToolRecommendation[]>);

        return (
            <div className="space-y-6">
                {Object.entries(groupedTools).map(([category, tools]) => (
                    <div key={category} className="bg-white rounded-xl shadow-md border border-stone-200 p-6">
                        <h3 className="text-xl font-semibold text-stone-800 mb-4">{category} Tools</h3>
                        <div className="divide-y divide-stone-100">
                        {tools.sort((a,b) => {
                           const levels = { 'Essential': 1, 'Recommended': 2, 'Advanced': 3 };
                           return levels[a.level] - levels[b.level];
                        }).map(tool => (
                            <div key={tool.name} className="py-3">
                                <div className="flex justify-between items-start gap-4">
                                    <div className="flex-1">
                                        <p className="font-semibold text-stone-800">{tool.name}</p>
                                        <p className="text-sm text-stone-600">{tool.description}</p>
                                    </div>
                                    <div className="flex flex-col items-end gap-2">
                                        <span className={`px-2 py-0.5 text-xs font-medium rounded-full ${tool.level === 'Essential' ? 'bg-green-100 text-green-800' : tool.level === 'Recommended' ? 'bg-blue-100 text-blue-800' : 'bg-orange-100 text-orange-800'}`}>{tool.level}</span>
                                        <button
                                            onClick={() => handleAddToToolkit(tool)}
                                            disabled={isToolInKit(tool.name)}
                                            className="flex items-center gap-1 text-xs font-semibold text-green-700 hover:text-green-600 disabled:text-stone-400 disabled:cursor-not-allowed transition-colors"
                                        >
                                            {isToolInKit(tool.name) ? <CheckCircleIcon className="w-4 h-4" /> : <PlusCircleIcon className="w-4 h-4" />}
                                            {isToolInKit(tool.name) ? 'In Toolkit' : 'Add to Toolkit'}
                                        </button>
                                    </div>
                                </div>
                            </div>
                        ))}
                        </div>
                    </div>
                ))}
            </div>
        );
    };
    
    const renderMyToolkit = () => {
        if (myToolkit.length === 0) {
            return (
                <div className="text-center bg-white rounded-xl shadow-md border border-stone-200 p-12">
                    <ToolboxIcon className="mx-auto h-16 w-16 text-stone-400" />
                    <h3 className="mt-4 text-xl font-semibold text-stone-800">Your Toolkit is Empty</h3>
                    <p className="mt-2 text-stone-600">Add tools from the "Tool Encyclopedia" tab to start managing your collection.</p>
                </div>
            )
        }
        
        return (
             <div className="space-y-4">
                {myToolkit.map(tool => (
                    <div key={tool.id} className="bg-white rounded-xl shadow-md border border-stone-200 p-4 transition-shadow hover:shadow-lg">
                        <div className="flex flex-col sm:flex-row gap-4">
                            <div className="flex-1">
                                <p className="font-bold text-lg text-stone-900">{tool.name}</p>
                                <p className="text-sm text-stone-500">{tool.description}</p>
                            </div>
                            <div className="flex flex-col sm:items-end gap-2">
                                <select 
                                    value={tool.condition}
                                    onChange={(e) => handleUpdateTool(tool.id, { condition: e.target.value as ToolCondition })}
                                    className={`w-full sm:w-auto text-sm font-medium border-0 rounded-md shadow-sm focus:ring-2 focus:ring-offset-2 ${conditionColors[tool.condition].bg} ${conditionColors[tool.condition].text} ${conditionColors[tool.condition].ring}`}
                                >
                                    {Object.values(ToolCondition).map(c => <option key={c} value={c}>{c}</option>)}
                                </select>
                                <p className="text-xs text-stone-500">
                                    Last Maintained: {tool.lastMaintained ? new Date(tool.lastMaintained).toLocaleDateString() : 'N/A'}
                                </p>
                            </div>
                        </div>
                        <div className="mt-4 pt-4 border-t border-stone-100 flex flex-col sm:flex-row items-center gap-4">
                           <div className="flex-1 w-full">
                                <label htmlFor={`notes-${tool.id}`} className="text-xs font-bold text-stone-500 uppercase">Notes</label>
                                <textarea
                                    id={`notes-${tool.id}`}
                                    rows={2}
                                    placeholder="Add notes about this tool..."
                                    value={tool.notes || ''}
                                    onChange={(e) => handleUpdateTool(tool.id, { notes: e.target.value })}
                                    className="block mt-1 w-full rounded-md border-stone-300 shadow-sm focus:border-green-500 focus:ring-green-500 sm:text-sm text-stone-800"
                                />
                           </div>
                           <div className="flex-shrink-0 flex sm:flex-col items-center gap-2 w-full sm:w-auto">
                                <button onClick={() => handleUpdateTool(tool.id, { lastMaintained: new Date().toISOString() })} className="w-full sm:w-auto flex items-center justify-center gap-2 text-sm font-semibold bg-blue-100 text-blue-700 hover:bg-blue-200 px-3 py-2 rounded-md transition-colors">Log Maintenance</button>
                                <button onClick={() => handleShowMaintenanceTips(tool)} disabled={!aiConfigured} className="w-full sm:w-auto flex items-center justify-center gap-2 text-sm font-semibold bg-stone-100 text-stone-700 hover:bg-stone-200 px-3 py-2 rounded-md transition-colors disabled:opacity-50 disabled:cursor-not-allowed"><InfoIcon className="w-4 h-4"/>Tips</button>
                                <button onClick={() => handleRemoveFromToolkit(tool.id)} className="w-full sm:w-auto flex items-center justify-center gap-2 text-sm font-semibold bg-red-100 text-red-700 hover:bg-red-200 px-3 py-2 rounded-md transition-colors"><Trash2Icon className="w-4 h-4"/>Remove</button>
                           </div>
                        </div>
                    </div>
                ))}
             </div>
        )
    };
    
    const renderModal = () => (
        <div className={`fixed inset-0 z-50 flex items-center justify-center transition-opacity ${modalOpen ? 'opacity-100' : 'opacity-0 pointer-events-none'}`}>
            <div className="absolute inset-0 bg-black/50" onClick={() => setModalOpen(false)}></div>
            <div className="bg-white rounded-2xl shadow-xl w-full max-w-lg m-4 p-6 relative transform transition-transform scale-95" style={{transform: modalOpen ? 'scale(1)' : 'scale(0.95)'}}>
                {modalLoading ? <Spinner text="Yuki is fetching maintenance tips..." /> : (
                modalContent && <>
                    <h3 className="text-2xl font-bold text-stone-900">Maintenance for {modalContent.toolName}</h3>
                    <div className="mt-4 space-y-4 text-stone-600">
                        <div>
                            <h4 className="font-semibold text-stone-800">Cleaning</h4>
                            <p>{modalContent.tips.cleaning}</p>
                        </div>
                        <div>
                            <h4 className="font-semibold text-stone-800">Sharpening</h4>
                            <p>{modalContent.tips.sharpening}</p>
                        </div>
                        <div>
                            <h4 className="font-semibold text-stone-800">Storage</h4>
                            <p>{modalContent.tips.storage}</p>
                        </div>
                    </div>
                    <button onClick={() => setModalOpen(false)} className="mt-6 w-full bg-green-700 text-white font-semibold py-2 px-4 rounded-lg hover:bg-green-600 transition-colors">
                        Close
                    </button>
                </>)}
            </div>
        </div>
    );

    return (
        <div className="space-y-8 max-w-5xl mx-auto">
            <header className="text-center">
                <h2 className="text-3xl font-bold tracking-tight text-stone-900 sm:text-4xl flex items-center justify-center gap-3">
                    <WrenchIcon className="w-8 h-8 text-gray-600" />
                    Bonsai Tool Shed
                </h2>
                <p className="mt-4 text-lg leading-8 text-stone-600">
                    Explore the encyclopedia of bonsai tools and manage your personal toolkit.
                </p>
            </header>
            
             <div className="bg-white p-2 rounded-xl shadow-lg border border-stone-200">
                <div className="flex gap-2">
                    <button onClick={() => setActiveTab('encyclopedia')} className={`flex-1 flex items-center justify-center gap-2 px-4 py-2 rounded-lg text-sm font-semibold transition-colors ${activeTab === 'encyclopedia' ? 'bg-green-700 text-white shadow' : 'bg-transparent text-stone-600 hover:bg-stone-100'}`}>
                        <BookOpenIcon className="w-5 h-5" /> Tool Encyclopedia
                    </button>
                    <button onClick={() => setActiveTab('toolkit')} className={`flex-1 flex items-center justify-center gap-2 px-4 py-2 rounded-lg text-sm font-semibold transition-colors ${activeTab === 'toolkit' ? 'bg-green-700 text-white shadow' : 'bg-transparent text-stone-600 hover:bg-stone-100'}`}>
                        <ToolboxIcon className="w-5 h-5" /> My Toolkit ({myToolkit.length})
                    </button>
                </div>
            </div>

            <div>
                {activeTab === 'encyclopedia' ? renderEncyclopedia() : renderMyToolkit()}
            </div>
            
            {renderModal()}
        </div>
    );
};

export default ToolGuideView;