<?php

namespace Database\Seeders;

use App\Models\Client;
use App\Models\Invoice;
use App\Models\InvoiceLine;
use App\Models\Quote;
use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\DB;

class InvoiceSeeder extends Seeder
{
    public function run(): void
    {
        $clientIds  = Client::pluck('id')->toArray();
        $products   = DB::table('products')->select('id', 'prix_unitaire')->get()->keyBy('id');
        $productIds = $products->keys()->toArray();

        if (empty($clientIds) || empty($productIds)) {
            $this->command->warn('InvoiceSeeder: aucun client ou produit trouvé — skip.');
            return;
        }

        // ── 1. Invoices liées à des devis acceptés ────────────────────────────
        $acceptedQuotes = Quote::where('status', 'accepte')
            ->orderBy('id')
            ->limit(35)
            ->get();

        foreach ($acceptedQuotes as $quote) {
            $invoiceDate = $quote->quote_date->copy()->addDays(rand(2, 10))->format('Y-m-d');
            $dueDate     = date('Y-m-d', strtotime($invoiceDate . ' +30 days'));

            // Statuses for quote-linked invoices (mostly paid)
            $s = ['payee', 'payee', 'payee', 'emise', 'envoyee', 'partiellement_payee'];

            Invoice::create([
                'client_id'       => $quote->client_id,
                'source_quote_id' => $quote->id,
                'status'          => $s[array_rand($s)],
                'invoice_date'    => $invoiceDate,
                'due_date'        => $dueDate,
                'currency'        => 'EUR',
                'total_ht'        => $quote->total_ht,
                'total_tva'       => $quote->total_tva,
                'total_ttc'       => $quote->total_ttc,
            ]);
            // Lines are not duplicated — source quote already has them
        }

        // ── 2. Invoices autonomes ─────────────────────────────────────────────
        // 2024 historical — statuses varied, many paid
        $this->createBatch($clientIds, $productIds, $products, [
            'yearRange' => [[2024, 1, 12]],
            'countPerMonth' => [3, 5],
            'statusPool' => ['payee', 'payee', 'payee', 'emise', 'envoyee', 'partiellement_payee', 'echue'],
        ]);

        // 2025 main year — rich dataset
        $this->createBatch($clientIds, $productIds, $products, [
            'yearRange' => [[2025, 1, 12]],
            'countPerMonth' => [4, 7],
            'statusPool' => ['payee', 'payee', 'payee', 'emise', 'envoyee', 'partiellement_payee', 'echue', 'echue'],
        ]);

        // 2026 Jan-Apr — no echue (due dates not yet past)
        $this->createBatch($clientIds, $productIds, $products, [
            'yearRange' => [[2026, 1, 4]],
            'countPerMonth' => [4, 6],
            'statusPool' => ['payee', 'payee', 'emise', 'envoyee', 'partiellement_payee'],
        ]);

        // 2026 May 1-8 — recent, mostly emise
        $this->createBatch($clientIds, $productIds, $products, [
            'yearRange' => [[2026, 5, 5]],
            'countPerMonth' => [4, 6],
            'maxDay' => 8,
            'statusPool' => ['payee', 'emise', 'emise', 'envoyee'],
        ]);

        $total = Invoice::count();
        $this->command->info("InvoiceSeeder: {$total} factures au total.");
    }

    // ─────────────────────────────────────────────────────────────────────────

    private function createBatch(
        array $clientIds,
        array $productIds,
        \Illuminate\Support\Collection $products,
        array $opts
    ): void {
        foreach ($opts['yearRange'] as [$year, $startM, $endM]) {
            for ($m = $startM; $m <= $endM; $m++) {
                $maxDay = $opts['maxDay'] ?? 28;
                $count  = rand(...$opts['countPerMonth']);

                for ($i = 0; $i < $count; $i++) {
                    $invoiceDate = sprintf('%04d-%02d-%02d', $year, $m, rand(1, $maxDay));
                    $status      = $opts['statusPool'][array_rand($opts['statusPool'])];

                    // due_date
                    if ($status === 'echue') {
                        $dueDate = date('Y-m-d', strtotime($invoiceDate . ' +10 days'));
                    } else {
                        $dueDate = date('Y-m-d', strtotime($invoiceDate . ' +30 days'));
                    }

                    $clientId = $clientIds[array_rand($clientIds)];

                    // Build lines
                    $lineData = [];
                    $totalHt  = 0.0;
                    for ($l = 0, $nl = rand(1, 3); $l < $nl; $l++) {
                        $pid       = $productIds[array_rand($productIds)];
                        $unitPrice = (float) ($products->get($pid)->prix_unitaire ?? 150.00);
                        $qty       = rand(1, 3);
                        $lineHt    = round($unitPrice * $qty, 2);
                        $totalHt  += $lineHt;
                        $lineData[] = [
                            'product_id'   => $pid,
                            'description'  => 'Prestation funéraire',
                            'qty_base'     => $qty,
                            'unit_price'   => $unitPrice,
                            'discount_pct' => 0,
                            'total_ht'     => $lineHt,
                        ];
                    }

                    $totalTva = round($totalHt * 0.20, 2);
                    $totalTtc = round($totalHt + $totalTva, 2);

                    $invoice = Invoice::create([
                        'client_id'    => $clientId,
                        'status'       => $status,
                        'invoice_date' => $invoiceDate,
                        'due_date'     => $dueDate,
                        'currency'     => 'EUR',
                        'total_ht'     => $totalHt,
                        'total_tva'    => $totalTva,
                        'total_ttc'    => $totalTtc,
                    ]);

                    foreach ($lineData as $line) {
                        InvoiceLine::create(array_merge($line, ['invoice_id' => $invoice->id]));
                    }
                }
            }
        }
    }
}