<?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
    {
        Schema::create('people_registry', function (Blueprint $table) {
            $table->id();
            $table->foreignId('tenant_id')->constrained()->restrictOnDelete();
            $table->foreignId('created_by')->constrained('users')->restrictOnDelete();
            $table->uuid('operation_key');
            $table->string('creation_hash', 64);
            $table->string('name', 200);
            $table->string('reference', 120);
            $table->string('reference_key', 120);
            $table->text('profile_summary');
            $table->boolean('active')->default(true);
            $table->unsignedInteger('version')->default(1);
            $table->timestamps();
            $table->unique(['tenant_id', 'reference_key']);
            $table->unique(['tenant_id', 'operation_key']);
            $table->unique(['tenant_id', 'id']);
        });
        Schema::table('people_applications', function (Blueprint $table) {
            $table->unsignedBigInteger('person_id')->nullable();
            $table->json('person_snapshot')->nullable();
            $table->foreign(['tenant_id', 'person_id'])->references(['tenant_id', 'id'])->on('people_registry')->restrictOnDelete();
            $table->unique(['people_process_id', 'person_id']);
        });
        if (DB::getDriverName() === 'pgsql') {
            DB::unprepared("CREATE FUNCTION sgc_guard_people_registry() RETURNS trigger LANGUAGE plpgsql AS $$ BEGIN
                IF TG_OP = 'DELETE' THEN RAISE EXCEPTION 'Preservar cadastro de pessoas'; END IF;
                IF NEW.version <> OLD.version + 1 OR ROW(NEW.tenant_id,NEW.created_by,NEW.operation_key,NEW.creation_hash)
                    IS DISTINCT FROM ROW(OLD.tenant_id,OLD.created_by,OLD.operation_key,OLD.creation_hash)
                    THEN RAISE EXCEPTION 'Preservar origem e versao do cadastro'; END IF;
                RETURN NEW; END $$;
                CREATE TRIGGER guard_people_registry BEFORE UPDATE OR DELETE ON people_registry FOR EACH ROW EXECUTE FUNCTION sgc_guard_people_registry();");
        } elseif (DB::getDriverName() === 'sqlite') {
            DB::unprepared("CREATE TRIGGER guard_people_registry_delete BEFORE DELETE ON people_registry BEGIN SELECT RAISE(ABORT, 'Preservar cadastro'); END;
                CREATE TRIGGER guard_people_registry_update BEFORE UPDATE ON people_registry WHEN NEW.version != OLD.version+1
                OR NEW.tenant_id IS NOT OLD.tenant_id OR NEW.created_by IS NOT OLD.created_by OR NEW.operation_key IS NOT OLD.operation_key OR NEW.creation_hash IS NOT OLD.creation_hash
                BEGIN SELECT RAISE(ABORT, 'Preservar origem e versao'); END;");
            // SQLite rebuilds a table to add composite foreign keys: restore its evidence guards.
            foreach (['UPDATE', 'DELETE'] as $operation) {
                DB::unprepared("DROP TRIGGER IF EXISTS preserve_people_applications_{$operation};
                    CREATE TRIGGER preserve_people_applications_{$operation} BEFORE {$operation} ON people_applications BEGIN SELECT RAISE(ABORT, 'Preservar evidencias'); END;");
            }
        }
    }

    public function down(): void
    {
        throw new LogicException('Preservar cadastro, candidaturas e versões históricas.');
    }
};