incr/resources/js/components/Transactions/AddPurchaseForm.tsx

import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import InputError from '@/components/InputError';
import { useForm } from '@inertiajs/react';
import { LoaderCircle } from 'lucide-react';
import { FormEventHandler, useEffect, useState } from 'react';
import ComponentTitle from '@/components/ui/ComponentTitle';

interface PurchaseFormData {
    date: string;
    shares: string;
    price_per_share: string;
    total_cost: string;
    [key: string]: string;
}

interface AddPurchaseFormProps {
    onSuccess?: () => void;
    onCancel?: () => void;
}

interface PurchaseSummary {
    total_shares: number;
    total_investment: number;
    average_cost_per_share: number;
}

export default function AddPurchaseForm({ onSuccess, onCancel }: AddPurchaseFormProps) {
    const { data, setData, post, processing, errors, reset } = useForm<PurchaseFormData>({
        date: new Date().toISOString().split('T')[0], // Today's date in YYYY-MM-DD format
        shares: '',
        price_per_share: '',
        total_cost: '',
    });

    const [currentHoldings, setCurrentHoldings] = useState<PurchaseSummary | null>(null);

    // Load existing holdings data on mount
    useEffect(() => {
        const fetchCurrentHoldings = async () => {
            try {
                const response = await fetch('/purchases/summary');
                if (response.ok) {
                    const summary = await response.json();
                    setCurrentHoldings(summary);
                }
            } catch (error) {
                console.error('Failed to fetch current holdings:', error);
            }
        };

        fetchCurrentHoldings();
    }, []);

    // Auto-calculate total cost when shares or price changes
    useEffect(() => {
        if (data.shares && data.price_per_share) {
            const shares = parseFloat(data.shares);
            const pricePerShare = parseFloat(data.price_per_share);

            if (!isNaN(shares) && !isNaN(pricePerShare)) {
                const totalCost = (shares * pricePerShare).toFixed(2);
                setData('total_cost', totalCost);
            }
        }
    }, [data.shares, data.price_per_share, setData]);

    const submit: FormEventHandler = (e) => {
        e.preventDefault();

        post(route('purchases.store'), {
            onSuccess: () => {
                reset();
                setData('date', new Date().toISOString().split('T')[0]);
                if (onSuccess) {
                    onSuccess();
                }
            },
        });
    };

    return (
        <div className="w-full">
            <div className="space-y-4">
                <ComponentTitle>ADD PURCHASE</ComponentTitle>
                {currentHoldings && currentHoldings.total_shares > 0 && (
                    <p className="text-sm text-red-400/60 font-mono">
                        [CURRENT] {currentHoldings.total_shares.toFixed(6)} shares • €{currentHoldings.total_investment.toFixed(2)} invested
                    </p>
                )}
                <form onSubmit={submit} className="space-y-4">
                    <div>
                        <Label htmlFor="date" className="text-red-400 font-mono text-xs uppercase tracking-wider">&gt; Purchase Date</Label>
                        <Input
                            id="date"
                            type="date"
                            value={data.date}
                            onChange={(e) => setData('date', e.target.value)}
                            max={new Date().toISOString().split('T')[0]}
                            className="bg-black border-red-500 text-red-400 focus:border-red-300 font-mono text-sm rounded-none border-2 focus:ring-0 focus:outline-none transition-all glow-red"
                        />
                        <InputError message={errors.date} />
                    </div>

                    <div>
                        <Label htmlFor="shares" className="text-red-400 font-mono text-xs uppercase tracking-wider">&gt; Number of Shares</Label>
                        <Input
                            id="shares"
                            type="number"
                            step="0.000001"
                            min="0"
                            placeholder="1.234567"
                            value={data.shares}
                            onChange={(e) => setData('shares', e.target.value)}
                            className="bg-black border-red-500 text-red-400 focus:border-red-300 font-mono text-sm rounded-none border-2 focus:ring-0 focus:outline-none placeholder:text-red-400/40 transition-all glow-red"
                        />
                        <InputError message={errors.shares} />
                    </div>

                    <div>
                        <Label htmlFor="price_per_share" className="text-red-400 font-mono text-xs uppercase tracking-wider">&gt; Price per Share (€)</Label>
                        <Input
                            id="price_per_share"
                            type="number"
                            step="0.01"
                            min="0"
                            placeholder="123.45"
                            value={data.price_per_share}
                            onChange={(e) => setData('price_per_share', e.target.value)}
                            className="bg-black border-red-500 text-red-400 focus:border-red-300 font-mono text-sm rounded-none border-2 focus:ring-0 focus:outline-none placeholder:text-red-400/40 transition-all glow-red"
                        />
                        <InputError message={errors.price_per_share} />
                    </div>

                    <div>
                        <Label htmlFor="total_cost" className="text-red-400 font-mono text-xs uppercase tracking-wider">&gt; Total Cost (€)</Label>
                        <Input
                            id="total_cost"
                            type="number"
                            step="0.01"
                            min="0"
                            placeholder="1234.56"
                            value={data.total_cost}
                            onChange={(e) => setData('total_cost', e.target.value)}
                            className="bg-black border-red-500 text-red-400 focus:border-red-300 font-mono text-sm rounded-none border-2 focus:ring-0 focus:outline-none placeholder:text-red-400/40 transition-all glow-red"
                        />
                        <p className="text-xs text-red-400/60 mt-1 font-mono">
                            [AUTO-CALC] shares × price
                        </p>
                        <InputError message={errors.total_cost} />
                    </div>

                    <div className="flex gap-3 pt-2">
                        <Button
                            type="submit"
                            disabled={processing}
                            className="flex-1 bg-red-500 hover:bg-red-500 text-black font-mono text-sm font-bold border-red-500 rounded-none border-2 uppercase tracking-wider transition-all glow-red"
                        >
                            {processing && <LoaderCircle className="mr-2 h-4 w-4 animate-spin" />}
                            [EXECUTE]
                        </Button>
                        {onCancel && (
                            <Button
                                type="button"
                                variant="outline"
                                onClick={onCancel}
                                className="flex-1 bg-black border-red-500 text-red-400 hover:bg-red-950 hover:text-red-300 font-mono text-sm font-bold rounded-none border-2 uppercase tracking-wider transition-all glow-red"
                            >
                                [ABORT]
                            </Button>
                        )}
                    </div>
                </form>
            </div>
        </div>
    );
}