<?php

namespace App\Mcp\Tools;

use App\Models\Transaction;
use App\Models\User;
use Illuminate\Contracts\JsonSchema\JsonSchema;
use Laravel\Mcp\Request;
use Laravel\Mcp\Response;
use Laravel\Mcp\Server\Attributes\Description;
use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;

#[IsReadOnly]
#[Description('Search and filter the user\'s transactions by text, category, account, date range and amount. Amounts are integers in minor units (cents). Use this to analyse spending or to find recurring charges by grouping results by merchant.')]
class SearchTransactions extends McpTool
{
    /**
     * @return array<string, mixed>
     */
    public function schema(JsonSchema $schema): array
    {
        return [
            'query' => $schema->string()->description('Free text matched against description, creditor and debtor names.'),
            'account_id' => $schema->string()->description('Restrict to a single account id.'),
            'category_id' => $schema->string()->description('Restrict to a single category id.'),
            'from' => $schema->string()->description('Earliest transaction date, YYYY-MM-DD.'),
            'to' => $schema->string()->description('Latest transaction date, YYYY-MM-DD.'),
            'min_amount' => $schema->integer()->description('Minimum signed amount in minor units (cents).'),
            'max_amount' => $schema->integer()->description('Maximum signed amount in minor units (cents).'),
            'limit' => $schema->integer()->min(1)->max(200)->description('Max rows to return (default 50).'),
            'space' => $schema->string()->description('Space id to query. Defaults to the personal space.'),
        ];
    }

    protected function respond(Request $request, User $user): Response
    {
        $request->validate([
            'from' => ['sometimes', 'date'],
            'to' => ['sometimes', 'date'],
            'limit' => ['sometimes', 'integer', 'min:1', 'max:200'],
        ]);

        $space = $this->resolveSpace($request, $user);

        $transactions = Transaction::query()
            ->forSpace($space)
            ->with(['account:id,name', 'category:id,name,type'])
            ->when($request->string('query')->toString() !== '', function ($query) use ($request): void {
                $term = '%'.$request->string('query')->toString().'%';
                $query->where(function ($q) use ($term): void {
                    $q->where('description', 'like', $term)
                        ->orWhere('creditor_name', 'like', $term)
                        ->orWhere('debtor_name', 'like', $term);
                });
            })
            ->when($request->string('account_id')->toString() !== '', fn ($query) => $query->where('account_id', $request->string('account_id')->toString()))
            ->when($request->string('category_id')->toString() !== '', fn ($query) => $query->where('category_id', $request->string('category_id')->toString()))
            ->when($request->string('from')->toString() !== '', fn ($query) => $query->whereDate('transaction_date', '>=', $request->string('from')->toString()))
            ->when($request->string('to')->toString() !== '', fn ($query) => $query->whereDate('transaction_date', '<=', $request->string('to')->toString()))
            ->when($request->has('min_amount'), fn ($query) => $query->where('amount', '>=', $request->integer('min_amount')))
            ->when($request->has('max_amount'), fn ($query) => $query->where('amount', '<=', $request->integer('max_amount')))
            ->orderByDesc('transaction_date')
            ->limit($request->integer('limit', 50))
            ->get()
            ->map(fn (Transaction $transaction): array => [
                'id' => $transaction->id,
                'date' => $transaction->transaction_date->toDateString(),
                'description' => $transaction->description,
                'amount' => $transaction->amount,
                'currency' => $transaction->currency_code,
                'category' => $transaction->category?->name,
                'category_id' => $transaction->category_id,
                'account' => $transaction->account?->name,
                'account_id' => $transaction->account_id,
                'source' => $transaction->source->value,
                'creditor_name' => $transaction->creditor_name,
                'debtor_name' => $transaction->debtor_name,
            ]);

        return $this->json([
            'space_id' => $space->id,
            'count' => $transactions->count(),
            'transactions' => $transactions,
        ]);
    }
}