import { useState, useEffect } from 'react';
import { batchesApi, Batch } from '../lib/batchesApi';
import { touchPointsApi } from '../lib/touchPointsApi';
import { Droplets, Utensils, Scissors, Dumbbell, Search, ShieldCheck, Shovel, Sprout, Fingerprint, ChevronLeft, Loader2 } from 'lucide-react';
import { PageHeader, EmptyState, CardSkeleton } from '../components/ui/LinearPrimitives';
import { useToast } from '../context/ToastContext';

export default function TouchPointPage() {
    const { addToast } = useToast();
    const [batches, setBatches] = useState<Batch[]>([]);
    const [isLoading, setIsLoading] = useState(true);
    const [selectedBatch, setSelectedBatch] = useState<Batch | null>(null);
    const [actionType, setActionType] = useState<string | null>(null);
    const [notes, setNotes] = useState('');
    const [submitting, setSubmitting] = useState(false);

    useEffect(() => {
        batchesApi.getAll().then(data => {
            setBatches(data.filter(b => b.status === 'ACTIVE'));
            setIsLoading(false);
        }).catch(err => {
            console.error(err);
            setIsLoading(false);
        });
    }, []);

    const actions = [
        { id: 'WATER', label: 'Water', icon: Droplets, accent: 'accent' as const },
        { id: 'FEED', label: 'Feed', icon: Utensils, accent: 'success' as const },
        { id: 'PRUNE', label: 'Prune', icon: Scissors, accent: 'warning' as const },
        { id: 'TRAIN', label: 'Train', icon: Dumbbell, accent: 'accent' as const },
        { id: 'INSPECT', label: 'Inspect', icon: Search, accent: 'default' as const },
        { id: 'IPM', label: 'IPM', icon: ShieldCheck, accent: 'destructive' as const },
        { id: 'TRANSPLANT', label: 'Transplant', icon: Shovel, accent: 'warning' as const },
        { id: 'HARVEST', label: 'Harvest', icon: Sprout, accent: 'success' as const },
    ];

    const getAccentClasses = (accent: string) => {
        switch (accent) {
            case 'success': return 'bg-success-muted text-success border-success/20 hover:border-success/40';
            case 'warning': return 'bg-warning-muted text-warning border-warning/20 hover:border-warning/40';
            case 'destructive': return 'bg-destructive-muted text-destructive border-destructive/20 hover:border-destructive/40';
            case 'accent': return 'bg-accent-muted text-accent border-accent/20 hover:border-accent/40';
            default: return 'bg-tertiary text-secondary border-default hover:border-strong';
        }
    };

    const handleSubmit = async () => {
        if (!selectedBatch || !actionType) return;
        setSubmitting(true);
        try {
            await touchPointsApi.create({
                batchId: selectedBatch.id,
                type: actionType as any,
                notes,
            });
            addToast('Touch point recorded!', 'success');
            setActionType(null);
            setNotes('');
        } catch (err) {
            addToast('Failed to record', 'error');
        } finally {
            setSubmitting(false);
        }
    };

    if (isLoading) {
        return (
            <div className="space-y-6 animate-in">
                <PageHeader title="Quick Actions" subtitle="Record plant interactions" />
                <div className="grid grid-cols-1 gap-3">
                    {Array.from({ length: 4 }).map((_, i) => <CardSkeleton key={i} />)}
                </div>
            </div>
        );
    }

    return (
        <div className="space-y-6 animate-in">
            <PageHeader
                title="Quick Actions"
                subtitle="Record plant interactions efficiently"
            />

            {/* Step 1: Select Batch */}
            {!selectedBatch ? (
                <div className="space-y-4">
                    <h3 className="text-xs font-medium text-tertiary uppercase tracking-wider px-1">
                        Select Batch
                    </h3>

                    {batches.length === 0 ? (
                        <EmptyState
                            icon={Fingerprint}
                            title="No active batches"
                            description="Create a batch to start recording touch points."
                        />
                    ) : (
                        <div className="grid gap-2">
                            {batches.map(batch => (
                                <button
                                    key={batch.id}
                                    onClick={() => setSelectedBatch(batch)}
                                    className="card card-interactive p-4 text-left group"
                                >
                                    <div className="flex items-center justify-between">
                                        <div>
                                            <div className="font-medium text-primary text-sm group-hover:text-accent transition-colors duration-fast">
                                                {batch.name?.replace('[DEMO] ', '')}
                                            </div>
                                            <div className="text-xs text-tertiary">{batch.strain}</div>
                                        </div>
                                        <ChevronLeft size={16} className="text-tertiary rotate-180 group-hover:translate-x-1 transition-transform duration-fast" />
                                    </div>
                                </button>
                            ))}
                        </div>
                    )}
                </div>
            ) : !actionType ? (
                /* Step 2: Select Action */
                <div className="space-y-4">
                    <button
                        onClick={() => setSelectedBatch(null)}
                        className="flex items-center gap-1 text-xs text-tertiary hover:text-primary transition-colors duration-fast"
                    >
                        <ChevronLeft size={14} />
                        Back to Batches
                    </button>

                    <div className="card p-4 flex items-center justify-between">
                        <div>
                            <div className="font-medium text-primary text-sm">
                                {selectedBatch.name?.replace('[DEMO] ', '')}
                            </div>
                            <div className="text-xs text-tertiary">Select an action</div>
                        </div>
                        <span className="badge">{selectedBatch.strain}</span>
                    </div>

                    <div className="grid grid-cols-2 sm:grid-cols-4 gap-3">
                        {actions.map(action => (
                            <button
                                key={action.id}
                                onClick={() => setActionType(action.id)}
                                className={`
                                    p-5 rounded-lg border flex flex-col items-center gap-3
                                    transition-all duration-fast active:scale-95
                                    ${getAccentClasses(action.accent)}
                                `}
                            >
                                <action.icon size={24} />
                                <span className="text-sm font-medium">{action.label}</span>
                            </button>
                        ))}
                    </div>
                </div>
            ) : (
                /* Step 3: Confirm */
                <div className="space-y-4">
                    <button
                        onClick={() => setActionType(null)}
                        className="flex items-center gap-1 text-xs text-tertiary hover:text-primary transition-colors duration-fast"
                    >
                        <ChevronLeft size={14} />
                        Back to Actions
                    </button>

                    <div className="flex items-center gap-2 text-xl font-semibold text-primary">
                        {(() => {
                            const action = actions.find(a => a.id === actionType);
                            const Icon = action?.icon || Fingerprint;
                            return <Icon size={24} className="text-accent" />;
                        })()}
                        {actions.find(a => a.id === actionType)?.label}
                        <span className="text-tertiary font-normal text-base">
                            for {selectedBatch.name?.replace('[DEMO] ', '')}
                        </span>
                    </div>

                    <div className="card p-4 space-y-4">
                        <div>
                            <label className="block text-xs font-medium text-tertiary uppercase tracking-wider mb-2">
                                Notes (Optional)
                            </label>
                            <textarea
                                value={notes}
                                onChange={e => setNotes(e.target.value)}
                                className="input w-full h-32 resize-none py-3"
                                placeholder="Add details about this action..."
                            />
                        </div>

                        <button
                            onClick={handleSubmit}
                            disabled={submitting}
                            className="btn btn-primary w-full h-12"
                        >
                            {submitting ? (
                                <>
                                    <Loader2 size={16} className="animate-spin" />
                                    Saving...
                                </>
                            ) : (
                                'Save Record'
                            )}
                        </button>
                    </div>
                </div>
            )}
        </div>
    );
}