<?php

use App\Models\Central\Company;
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('warehouses', function (Blueprint $t) {
            $t->id();
            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
            $t->string('code', 32);
            $t->string('name', 120);
            $t->string('address')->nullable();
            $t->boolean('is_default')->default(false);
            $t->boolean('is_active')->default(true);
            $t->timestamps();
            $t->softDeletes();

            $t->unique(['company_id', 'code']);
            $t->index(['company_id', 'is_active']);
        });

        Schema::create('part_batches', function (Blueprint $t) {
            $t->id();
            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
            $t->foreignId('part_id')->constrained()->cascadeOnDelete();
            $t->foreignId('warehouse_id')->constrained()->cascadeOnDelete();
            $t->foreignId('supplier_id')->nullable()->constrained()->nullOnDelete();
            $t->string('batch_ref', 64)->nullable();          // PO number / invoice ref
            $t->decimal('qty_in', 12, 3);                     // initial intake
            $t->decimal('qty_remaining', 12, 3);              // current available
            $t->decimal('buy_price', 12, 2);                  // unit cost for this batch
            $t->dateTime('received_at');
            $t->text('notes')->nullable();
            $t->timestamps();

            // FIFO consume = ORDER BY received_at ASC, id ASC
            $t->index(['company_id', 'part_id', 'warehouse_id', 'received_at']);
            $t->index(['company_id', 'qty_remaining']);
        });

        Schema::create('warehouse_events', function (Blueprint $t) {
            $t->id();
            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
            $t->foreignId('part_id')->constrained()->cascadeOnDelete();
            $t->foreignId('batch_id')->nullable()->constrained('part_batches')->nullOnDelete();
            $t->foreignId('warehouse_id')->constrained()->cascadeOnDelete();
            $t->string('type', 24);   // opening / receipt / issue / transfer_out / transfer_in / adjustment / write_off / return
            $t->decimal('qty_delta', 12, 3);   // signed: + intake, − issue
            $t->decimal('unit_cost', 12, 2)->nullable();
            $t->nullableMorphs('ref');         // ref_type/ref_id — link la WorkOrder/Purchase/Transfer/Inventory
            $t->foreignId('user_id')->nullable()->constrained('users')->nullOnDelete();
            $t->dateTime('occurred_at');
            $t->text('notes')->nullable();
            $t->timestamps();

            $t->index(['company_id', 'part_id', 'occurred_at']);
            $t->index(['company_id', 'warehouse_id', 'occurred_at']);
            $t->index(['company_id', 'type']);
        });

        Schema::create('part_reservations', function (Blueprint $t) {
            $t->id();
            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
            $t->foreignId('work_order_id')->constrained()->cascadeOnDelete();
            $t->foreignId('work_order_part_id')->nullable()->constrained('wo_parts')->cascadeOnDelete();
            $t->foreignId('part_id')->constrained()->cascadeOnDelete();
            $t->foreignId('batch_id')->constrained('part_batches')->cascadeOnDelete();
            $t->decimal('qty', 12, 3);
            $t->string('status', 16)->default('active');  // active / consumed / released
            $t->dateTime('reserved_at');
            $t->dateTime('consumed_at')->nullable();
            $t->timestamps();

            $t->index(['company_id', 'work_order_id']);
            $t->index(['company_id', 'part_id', 'status']);
            $t->index(['company_id', 'batch_id', 'status']);
        });

        Schema::table('companies', function (Blueprint $t) {
            $t->foreignId('default_warehouse_id')->nullable()->after('plan_id')
                ->constrained('warehouses')->nullOnDelete();
        });

        Schema::table('parts', function (Blueprint $t) {
            $t->decimal('qty_reserved', 12, 3)->default(0)->after('qty');
        });

        // ── Backfill ──────────────────────────────────────────────────
        // For each existing company: create 1 default warehouse + open
        // one batch per part with the current parts.qty as opening stock.
        $now = now();
        foreach (Company::withoutGlobalScopes()->cursor() as $company) {
            $whId = DB::table('warehouses')->insertGetId([
                'company_id' => $company->id,
                'code' => 'MAIN',
                'name' => 'Depozit principal',
                'is_default' => true,
                'is_active' => true,
                'created_at' => $now,
                'updated_at' => $now,
            ]);

            DB::table('companies')->where('id', $company->id)
                ->update(['default_warehouse_id' => $whId]);

            $parts = DB::table('parts')
                ->where('company_id', $company->id)
                ->whereNull('deleted_at')
                ->where('qty', '>', 0)
                ->get();

            foreach ($parts as $p) {
                $batchId = DB::table('part_batches')->insertGetId([
                    'company_id' => $company->id,
                    'part_id' => $p->id,
                    'warehouse_id' => $whId,
                    'qty_in' => $p->qty,
                    'qty_remaining' => $p->qty,
                    'buy_price' => $p->buy_price,
                    'received_at' => $p->created_at ?: $now,
                    'notes' => 'Stoc inițial (migrare)',
                    'created_at' => $now,
                    'updated_at' => $now,
                ]);

                DB::table('warehouse_events')->insert([
                    'company_id' => $company->id,
                    'part_id' => $p->id,
                    'batch_id' => $batchId,
                    'warehouse_id' => $whId,
                    'type' => 'opening',
                    'qty_delta' => $p->qty,
                    'unit_cost' => $p->buy_price,
                    'occurred_at' => $p->created_at ?: $now,
                    'notes' => 'Stoc inițial la migrare',
                    'created_at' => $now,
                    'updated_at' => $now,
                ]);
            }
        }
    }

    public function down(): void
    {
        Schema::table('parts', function (Blueprint $t) {
            $t->dropColumn('qty_reserved');
        });
        Schema::table('companies', function (Blueprint $t) {
            $t->dropForeign(['default_warehouse_id']);
            $t->dropColumn('default_warehouse_id');
        });
        Schema::dropIfExists('part_reservations');
        Schema::dropIfExists('warehouse_events');
        Schema::dropIfExists('part_batches');
        Schema::dropIfExists('warehouses');
    }
};