<?php

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

return new class extends Migration
{
    /**
     * Kern des Datenmodells: Mandant → Projekt → Abschnitt (PFA) → Vertrag → LVs und Nachträge.
     * Beschreibung in docs/datenmodell.md.
     */
    public function up(): void
    {
        Schema::create('mandanten', function (Blueprint $table) {
            $table->id();
            $table->string('name')->unique();
            $table->timestamps();
        });

        Schema::table('users', function (Blueprint $table) {
            $table->foreignId('mandant_id')->nullable()->after('id')->constrained('mandanten')->restrictOnDelete();
        });

        Schema::create('auftragnehmer', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->string('name');
            $table->timestamps();

            $table->unique(['mandant_id', 'land', 'name']);
        });

        Schema::create('projekte', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->string('name');
            $table->string('nummer', 100)->nullable();
            $table->string('auftraggeber');
            $table->string('vertragsgrundlage', 20)->default('vob_b');
            $table->string('abschnitt_bezeichnung', 50)->default('PFA');
            $table->string('status', 20)->default('aktiv');
            $table->boolean('suche_andere_vertraege_im_abschnitt')->default(false);
            $table->boolean('suche_andere_abschnitte')->default(true);
            $table->boolean('suche_nur_gleicher_auftragnehmer')->default(false);
            $table->timestamps();

            $table->index(['mandant_id', 'land', 'status']);
        });

        Schema::create('projekt_mitglieder', function (Blueprint $table) {
            $table->foreignId('projekt_id')->constrained('projekte')->cascadeOnDelete();
            $table->foreignId('user_id')->constrained('users')->cascadeOnDelete();
            $table->string('rolle', 20);
            $table->timestamps();

            $table->primary(['projekt_id', 'user_id']);
        });

        Schema::create('abschnitte', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->constrained('projekte')->restrictOnDelete();
            $table->string('bezeichnung', 100);
            $table->unsignedSmallInteger('sortierung')->default(0);
            $table->timestamps();

            $table->unique(['projekt_id', 'bezeichnung']);
        });

        Schema::create('vertraege', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->constrained('projekte')->restrictOnDelete();
            $table->foreignId('abschnitt_id')->constrained('abschnitte')->restrictOnDelete();
            $table->foreignId('auftragnehmer_id')->constrained('auftragnehmer')->restrictOnDelete();
            $table->string('bezeichnung', 150);
            $table->string('vertragsnummer', 100)->nullable();
            $table->date('vertrag_vom')->nullable();
            $table->timestamps();
        });

        Schema::create('leistungsverzeichnisse', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->constrained('projekte')->restrictOnDelete();
            $table->foreignId('vertrag_id')->constrained('vertraege')->restrictOnDelete();
            $table->string('bezeichnung');
            $table->string('import_status', 20)->default('wartet');
            $table->text('import_fehler')->nullable();
            $table->timestamps();
        });

        Schema::create('nachtraege', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->constrained('projekte')->restrictOnDelete();
            $table->foreignId('vertrag_id')->constrained('vertraege')->restrictOnDelete();
            $table->string('nummer', 50);
            $table->date('eingang_am');
            $table->string('betreff');
            $table->json('mka_bezug')->nullable();
            $table->string('status', 20)->default('eingegangen');
            $table->foreignId('zugewiesen_an')->nullable()->constrained('users')->nullOnDelete();
            $table->timestamps();

            $table->unique(['vertrag_id', 'nummer']);
            $table->index(['projekt_id', 'status']);
        });

        Schema::create('nachtragspositionen', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->constrained('projekte')->restrictOnDelete();
            $table->foreignId('nachtrag_id')->constrained('nachtraege')->cascadeOnDelete();
            $table->string('oz', 50);
            $table->string('kurztext', 500);
            $table->text('langtext')->nullable();
            $table->decimal('menge', 15, 3)->nullable();
            $table->string('einheit', 20)->nullable();
            $table->decimal('einheitspreis', 15, 2)->nullable();
            $table->unsignedInteger('sortierung')->default(0);
            $table->timestamps();

            $table->unique(['nachtrag_id', 'oz']);
        });

        Schema::create('dokumente', function (Blueprint $table) {
            $table->id();
            $table->foreignId('mandant_id')->constrained('mandanten')->restrictOnDelete();
            $table->char('land', 2);
            $table->foreignId('projekt_id')->nullable()->constrained('projekte')->restrictOnDelete();
            $table->nullableMorphs('dokumentable');
            $table->string('kategorie', 40);
            $table->string('dateiname');
            $table->string('pfad', 500);
            $table->string('mime_type', 150);
            $table->unsignedBigInteger('groesse');
            $table->char('sha256', 64);
            $table->boolean('vertraulich')->default(false);
            $table->foreignId('hochgeladen_von')->nullable()->constrained('users')->nullOnDelete();
            $table->timestamps();

            $table->index(['projekt_id', 'kategorie']);
            $table->index('sha256');
        });

        Schema::create('dokument_freigaben', function (Blueprint $table) {
            $table->foreignId('dokument_id')->constrained('dokumente')->cascadeOnDelete();
            $table->foreignId('user_id')->constrained('users')->cascadeOnDelete();
            $table->timestamps();

            $table->primary(['dokument_id', 'user_id']);
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('dokument_freigaben');
        Schema::dropIfExists('dokumente');
        Schema::dropIfExists('nachtragspositionen');
        Schema::dropIfExists('nachtraege');
        Schema::dropIfExists('leistungsverzeichnisse');
        Schema::dropIfExists('vertraege');
        Schema::dropIfExists('abschnitte');
        Schema::dropIfExists('projekt_mitglieder');
        Schema::dropIfExists('projekte');
        Schema::dropIfExists('auftragnehmer');

        Schema::table('users', function (Blueprint $table) {
            $table->dropConstrainedForeignId('mandant_id');
        });

        Schema::dropIfExists('mandanten');
    }
};