<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('tenants', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('currency', 3)->default('MZN');
            $table->unsignedBigInteger('first_limit_minor')->default(2500000);
            $table->unsignedBigInteger('second_limit_minor')->default(15000000);
            $table->boolean('approval_includes_tax')->default(true);
            $table->boolean('rules_provisional')->default(true);
            $table->timestamps();
        });

        Schema::create('departments', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->string('name');
            $table->timestamps();
            $table->unique(['tenant_id', 'name']);
        });

        Schema::create('cost_centers', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->foreignId('department_id')->constrained()->restrictOnDelete();
            $table->string('code');
            $table->string('name');
            $table->timestamps();
            $table->unique(['tenant_id', 'code']);
        });

        Schema::table('users', function (Blueprint $table) {
            $table->foreignId('tenant_id')->nullable()->constrained()->restrictOnDelete();
            $table->foreignId('department_id')->nullable()->constrained()->restrictOnDelete();
            $table->string('purchasing_role')->default('requester');
        });

        Schema::create('requisitions', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->string('number')->nullable()->unique();
            $table->foreignId('requester_id')->constrained('users')->restrictOnDelete();
            $table->foreignId('department_id')->constrained()->restrictOnDelete();
            $table->foreignId('cost_center_id')->constrained()->restrictOnDelete();
            $table->string('priority');
            $table->date('needed_by');
            $table->text('justification');
            $table->string('status')->default('draft');
            $table->string('currency', 3)->default('MZN');
            $table->unsignedBigInteger('subtotal_minor');
            $table->unsignedBigInteger('tax_minor');
            $table->unsignedBigInteger('total_minor');
            $table->json('approval_snapshot')->nullable();
            $table->timestamp('submitted_at')->nullable();
            $table->timestamps();
            $table->index(['tenant_id', 'status']);
        });

        Schema::create('requisition_items', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->foreignId('requisition_id')->constrained()->cascadeOnDelete();
            $table->string('description');
            $table->string('category');
            $table->string('purchase_type');
            $table->decimal('quantity', 12, 3);
            $table->string('unit', 30);
            $table->unsignedBigInteger('unit_price_minor');
            $table->decimal('tax_rate', 5, 2);
            $table->unsignedBigInteger('subtotal_minor');
            $table->unsignedBigInteger('tax_minor');
            $table->unsignedBigInteger('total_minor');
        });

        Schema::create('approval_steps', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->foreignId('requisition_id')->constrained()->restrictOnDelete();
            $table->unsignedSmallInteger('position');
            $table->string('role');
            $table->string('decision')->default('pending');
            $table->foreignId('approver_id')->nullable()->constrained('users')->restrictOnDelete();
            $table->text('comment')->nullable();
            $table->timestamp('decided_at')->nullable();
            $table->unique(['requisition_id', 'position']);
        });

        Schema::create('audit_logs', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->foreignId('user_id')->constrained()->restrictOnDelete();
            $table->string('action');
            $table->foreignId('requisition_id')->nullable()->constrained()->restrictOnDelete();
            $table->string('ip_address', 45)->nullable();
            $table->json('before')->nullable();
            $table->json('after');
            $table->timestamp('created_at')->useCurrent();
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('audit_logs');
        Schema::dropIfExists('approval_steps');
        Schema::dropIfExists('requisition_items');
        Schema::dropIfExists('requisitions');
        Schema::table('users', function (Blueprint $table) {
            $table->dropConstrainedForeignId('department_id');
            $table->dropConstrainedForeignId('tenant_id');
            $table->dropColumn('purchasing_role');
        });
        Schema::dropIfExists('cost_centers');
        Schema::dropIfExists('departments');
        Schema::dropIfExists('tenants');
    }
};