<?php

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
    {
        foreach (['labour_demands', 'training_capacities'] as $name) {
            Schema::create($name, function (Blueprint $table) use ($name) {
                $table->uuid('id')->primary();
                $table->foreignUuid('occupation_id')->constrained('occupations')->restrictOnDelete();
                $table->foreignUuid('skill_id')->constrained('skills')->restrictOnDelete();
                $table->foreignUuid('geo_location_id')->constrained('geo_locations')->restrictOnDelete();
                if ($name === 'labour_demands') {
                    $table->foreignUuid('project_id')->constrained('projects')->restrictOnDelete();
                    $table->string('employer');
                } else {
                    $table->foreignUuid('course_id')->constrained('courses')->restrictOnDelete();
                }
                $table->string('qualification');
                $table->unsignedInteger('quantity');
                $table->date('period_start');
                $table->date('period_end');
                $table->text('source');
                $table->date('reference_date');
                $table->date('valid_until');
                $table->string('status')->default('submitted');
                $table->unsignedInteger('version_no')->default(1);
                $table->foreignId('submitted_by')->constrained('users')->restrictOnDelete();
                $table->foreignId('reviewed_by')->nullable()->constrained('users')->restrictOnDelete();
                $table->text('review_reason')->nullable();
                $table->timestampsTz();
                $table->softDeletesTz();
                $table->index(['status', 'valid_until']);
            });
            DB::statement("ALTER TABLE {$name} ADD CONSTRAINT {$name}_valid CHECK (quantity > 0 AND version_no > 0 AND period_end >= period_start AND valid_until >= reference_date AND status IN ('submitted','reviewed','rejected') AND (status = 'submitted' OR (reviewed_by IS NOT NULL AND reviewed_by <> submitted_by AND review_reason IS NOT NULL)))");
        }
    }

    public function down(): void
    {
        foreach (['training_capacities', 'labour_demands'] as $table) {
            if (DB::table($table)->exists()) {
                throw new RuntimeException('Preserve education submissions and reconcile before rollback.');
            }
        }
        Schema::dropIfExists('training_capacities');
        Schema::dropIfExists('labour_demands');
    }
};