<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Jobs\Import;

use App\Factory\ClientFactory;
use App\Factory\InvoiceFactory;
use App\Factory\PaymentFactory;
use App\Http\Requests\Invoice\StoreInvoiceRequest;
use App\Import\ImportException;
use App\Import\Transformers\BaseTransformer;
use App\Jobs\Mail\MailRouter;
use App\Libraries\MultiDB;
use App\Mail\Import\ImportCompleted;
use App\Models\Client;
use App\Models\ClientContact;
use App\Models\Company;
use App\Models\Country;
use App\Models\Currency;
use App\Models\ExpenseCategory;
use App\Models\Invoice;
use App\Models\PaymentType;
use App\Models\Product;
use App\Models\Project;
use App\Models\TaxRate;
use App\Models\User;
use App\Models\Vendor;
use App\Repositories\ClientRepository;
use App\Repositories\InvoiceRepository;
use App\Repositories\PaymentRepository;
use App\Utils\Traits\CleanLineItems;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Str;
use League\Csv\Reader;
use League\Csv\Statement;
use Symfony\Component\HttpFoundation\ParameterBag;
use Symfony\Component\HttpFoundation\Request;

class CSVImport implements ShouldQueue {
	use Dispatchable, InteractsWithQueue, Queueable, SerializesModels, CleanLineItems;

	public $invoice;

	public $company;

	public $hash;

	public $import_type;

	public $skip_header;

	public $column_map;

	public $import_array;

	public $error_array = [];

	public $maps;

	public function __construct( array $request, Company $company ) {
		$this->company     = $company;
		$this->hash        = $request['hash'];
		$this->import_type = $request['import_type'];
		$this->skip_header = $request['skip_header'] ?? null;
		$this->column_map  = $request['column_map'] ?? null;
	}

	/**
	 * Execute the job.
	 *
	 *
	 * @return void
	 */
	public function handle() {

		MultiDB::setDb( $this->company->db );

		$this->company->owner()->setCompany( $this->company );
		Auth::login( $this->company->owner(), true );

		$this->buildMaps();

		nlog( "import " . $this->import_type );
		foreach ( [ 'client', 'product', 'invoice', 'payment', 'vendor', 'expense' ] as $entityType ) {
			$csvData = $this->getCsvData( $entityType );

			if ( ! empty( $csvData ) ) {
				$importFunction       = "import" . Str::plural( Str::title( $entityType ) );
				$preTransformFunction = "preTransform" . Str::title( $this->import_type );

				if ( method_exists( $this, $preTransformFunction ) ) {
					$csvData = $this->$preTransformFunction( $csvData, $entityType );
				}

				if ( empty( $csvData ) ) {
					continue;
				}

				if ( method_exists( $this, $importFunction ) ) {
					// If there's an entity-specific import function, use that.
					$this->$importFunction( $csvData );
				} else {
					// Otherwise, use the generic import function.
					$this->importEntities( $csvData, $entityType );
				}
			}
		}

		$data = [
			'errors'  => $this->error_array,
			'company' => $this->company,
		];

		MailRouter::dispatchNow( new ImportCompleted( $data ), $this->company, auth()->user() );
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	private function preTransformCsv( $csvData, $entityType ) {
		if ( empty( $this->column_map[ $entityType ] ) ) {
			return false;
		}

		if ( $this->skip_header ) {
			array_shift( $csvData );
		}

		//sort the array by key
		$keys = $this->column_map[ $entityType ];
		ksort( $keys );

		$csvData = array_map( function ( $row ) use ( $keys ) {
			return array_combine( $keys, array_intersect_key( $row, $keys ) );
		}, $csvData );

		if ( $entityType === 'invoice' ) {
			$csvData = $this->groupInvoices( $csvData, 'invoice.number' );
		}

		return $csvData;
	}

	private function preTransformFreshbooks( $csvData, $entityType ) {
		$csvData = $this->mapCSVHeaderToKeys( $csvData );

		if ( $entityType === 'invoice' ) {
			$csvData = $this->groupInvoices( $csvData, 'Invoice #' );
		}

		return $csvData;
	}

	private function preTransformInvoicely( $csvData, $entityType ) {
		$csvData = $this->mapCSVHeaderToKeys( $csvData );

		return $csvData;
	}

	private function preTransformInvoice2go( $csvData, $entityType ) {
		$csvData = $this->mapCSVHeaderToKeys( $csvData );

		return $csvData;
	}

	private function preTransformZoho( $csvData, $entityType ) {
		$csvData = $this->mapCSVHeaderToKeys( $csvData );

		if ( $entityType === 'invoice' ) {
			$csvData = $this->groupInvoices( $csvData, 'Invoice Number' );
		}

		return $csvData;
	}

	private function preTransformWaveaccounting( $csvData, $entityType ) {
		$csvData = $this->mapCSVHeaderToKeys( $csvData );

		if ( $entityType === 'invoice' ) {
			$csvData = $this->groupInvoices( $csvData, 'Invoice Number' );
		}

		return $csvData;
	}

	private function groupInvoices( $csvData, $key ) {
		// Group by invoice.
		$grouped = [];

		foreach ( $csvData as $line_item ) {
			if ( empty( $line_item[ $key ] ) ) {
				$this->error_array['invoice'][] = [ 'invoice' => $line_item, 'error' => 'No invoice number' ];
			} else {
				$grouped[ $line_item[ $key ] ][] = $line_item;
			}
		}

		return $grouped;
	}

	private function mapCSVHeaderToKeys( $csvData ) {
		$keys = array_shift( $csvData );

		return array_map( function ( $values ) use ( $keys ) {
			return array_combine( $keys, $values );
		}, $csvData );
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	private function importInvoices( $invoices ) {
		$invoice_transformer = $this->getTransformer( 'invoice' );

		/** @var PaymentRepository $payment_repository */
		$payment_repository = app()->make( PaymentRepository::class );
		/** @var ClientRepository $client_repository */
		$client_repository = app()->make( ClientRepository::class );

		foreach ( $invoices as $raw_invoice ) {
			try {
				$invoice_data       = $invoice_transformer->transform( $raw_invoice );
				$invoice_repository = new InvoiceRepository();

				$invoice_data['line_items'] = $this->cleanItems( $invoice_data['line_items'] ?? [] );


				// If we don't have a client ID, but we do have client data, go ahead and create the client.
				if ( empty( $invoice_data['client_id'] ) && ! empty( $invoice_data['client'] ) ) {
					$client_data            = $invoice_data['client'];
					$client_data['user_id'] = $this->getUserIDForRecord( $invoice_data );

					$client_repository->save(
						$client_data,
						$client = ClientFactory::create( $this->company->id, $client_data['user_id'] )
					);
					$invoice_data['client_id'] = $client->id;
					unset( $invoice_data['client'] );
				}

				$validator = Validator::make( $invoice_data, ( new StoreInvoiceRequest() )->rules() );
				if ( $validator->fails() ) {
					$this->error_array['invoice'][] =
						[ 'invoice' => $invoice_data, 'error' => $validator->errors()->all() ];
				} else {
					$invoice = InvoiceFactory::create( $this->company->id, $this->getUserIDForRecord( $invoice_data ) );
					if ( ! empty( $invoice_data['status_id'] ) ) {
						$invoice->status_id = $invoice_data['status_id'];
					}
					$invoice_repository->save( $invoice_data, $invoice );
					$this->addInvoiceToMaps( $invoice );

					// If we're doing a generic CSV import, only import payment data if we're not importing a payment CSV.
					// If we're doing a platform-specific import, trust the platform to only return payment info if there's not a separate payment CSV.
					if ( $this->import_type !== 'csv' || empty( $this->column_map['payment'] ) ) {
						// Check for payment columns
						if ( ! empty( $invoice_data['payments'] ) ) {
							foreach ( $invoice_data['payments'] as $payment_data ) {
								$payment_data['user_id']   = $invoice->user_id;
								$payment_data['client_id'] = $invoice->client_id;
								$payment_data['invoices']  = [
									[
										'invoice_id' => $invoice->id,
										'amount'     => $payment_data['amount'] ?? null,
									],
								];

								$payment_repository->save(
									$payment_data,
									PaymentFactory::create( $this->company->id, $invoice->user_id, $invoice->client_id )
								);
							}
						}
					}

					$this->actionInvoiceStatus( $invoice, $invoice_data, $invoice_repository );
				}
			} catch ( \Exception $ex ) {
				if ( $ex instanceof ImportException ) {
					$message = $ex->getMessage();
				} else {
					report( $ex );
					$message = 'Unknown error';
				}

				$this->error_array['invoice'][] = [ 'invoice' => $raw_invoice, 'error' => $message ];
			}
		}
	}

	private function actionInvoiceStatus( $invoice, $invoice_data, $invoice_repository ) {
		if ( ! empty( $invoice_data['archived'] ) ) {
			$invoice_repository->archive( $invoice );
			$invoice->fresh();
		}

		if ( ! empty( $invoice_data['viewed'] ) ) {
			$invoice = $invoice->service()->markViewed()->save();
		}

		if ( $invoice->status_id === Invoice::STATUS_SENT ) {
			$invoice = $invoice->service()->markSent()->save();
		}

		if ( $invoice->status_id <= Invoice::STATUS_SENT && $invoice->amount > 0 ) {
			if ( $invoice->balance < $invoice->amount ) {
				$invoice->status_id = Invoice::STATUS_PARTIAL;
				$invoice->save();
			} elseif ( $invoice->balance <= 0 ) {
				$invoice->status_id = Invoice::STATUS_PAID;
				$invoice->save();
			}
		}


		return $invoice;
	}

	private function importEntities( $records, $entity_type ) {
		$entity_type           = Str::slug( $entity_type, '_' );
		$formatted_entity_type = Str::title( $entity_type );

		$request_name    = "\\App\\Http\\Requests\\${formatted_entity_type}\\Store${formatted_entity_type}Request";
		$repository_name = '\\App\\Repositories\\' . $formatted_entity_type . 'Repository';
		$factoryName     = '\\App\\Factory\\' . $formatted_entity_type . 'Factory';

		$repository  = app()->make( $repository_name );
		$transformer = $this->getTransformer( $entity_type );

		foreach ( $records as $record ) {
			try {
				$entity = $transformer->transform( $record );

				/** @var \App\Http\Requests\Request $request */
				$request        = new $request_name();

				// Pass entity data to request so it can be validated
				$request->query = $request->request = new ParameterBag( $entity );
				$validator = Validator::make( $entity, $request->rules() );

				if ( $validator->fails() ) {
					$this->error_array[ $entity_type ][] =
						[ $entity_type => $record, 'error' => $validator->errors()->all() ];
				} else {
					$entity =
						$repository->save(
							array_diff_key( $entity, [ 'user_id' => false ] ),
							$factoryName::create( $this->company->id, $this->getUserIDForRecord( $entity ) ) );

					$entity->save();
					if ( method_exists( $this, 'add' . $formatted_entity_type . 'ToMaps' ) ) {
						$this->{'add' . $formatted_entity_type . 'ToMaps'}( $entity );
					}
				}
			} catch ( \Exception $ex ) {
				if ( $ex instanceof ImportException ) {
					$message = $ex->getMessage();
				} else {
					report( $ex );
					$message = 'Unknown error';
				}

				$this->error_array[ $entity_type ][] = [ $entity_type => $record, 'error' => $message ];
			}
		}
	}

	/**
	 * @param $entity_type
	 *
	 * @return BaseTransformer
	 */
	private function getTransformer( $entity_type ) {
		$formatted_entity_type = Str::title( $entity_type );
		$formatted_import_type = Str::title( $this->import_type );
		$transformer_name      =
			'\\App\\Import\\Transformers\\' . $formatted_import_type . '\\' . $formatted_entity_type . 'Transformer';

		return new $transformer_name( $this->maps );
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	private function buildMaps() {
		$this->maps = [
			'company'            => $this->company,
			'client'             => [],
			'contact'            => [],
			'invoice'            => [],
			'invoice_client'     => [],
			'product'            => [],
			'countries'          => [],
			'countries2'         => [],
			'currencies'         => [],
			'client_ids'         => [],
			'invoice_ids'        => [],
			'vendors'            => [],
			'expense_categories' => [],
			'payment_types'      => [],
			'tax_rates'          => [],
			'tax_names'          => [],
		];

		$clients = Client::scope()->get();
		foreach ( $clients as $client ) {
			$this->addClientToMaps( $client );
		}

		$contacts = ClientContact::scope()->get();
		foreach ( $contacts as $contact ) {
			$this->addContactToMaps( $contact );
		}

		$invoices = Invoice::scope()->get();
		foreach ( $invoices as $invoice ) {
			$this->addInvoiceToMaps( $invoice );
		}

		$products = Product::scope()->get();
		foreach ( $products as $product ) {
			$this->addProductToMaps( $product );
		}

		$projects = Project::scope()->get();
		foreach ( $projects as $project ) {
			$this->addProjectToMaps( $projects );
		}

		$countries = Country::all();
		foreach ( $countries as $country ) {
			$this->maps['countries'][ strtolower( $country->name ) ]        = $country->id;
			$this->maps['countries2'][ strtolower( $country->iso_3166_2 ) ] = $country->id;
		}

		$currencies = Currency::all();
		foreach ( $currencies as $currency ) {
			$this->maps['currencies'][ strtolower( $currency->code ) ] = $currency->id;
		}

		$payment_types = PaymentType::all();
		foreach ( $payment_types as $payment_type ) {
			$this->maps['payment_types'][ strtolower( $payment_type->name ) ] = $payment_type->id;
		}

		$vendors = Vendor::scope()->get();
		foreach ( $vendors as $vendor ) {
			$this->addVendorToMaps( $vendor );
		}

		$expenseCaegories = ExpenseCategory::scope()->get();
		foreach ( $expenseCaegories as $category ) {
			$this->addExpenseCategoryToMaps( $category );
		}

		$taxRates = TaxRate::scope()->get();
		foreach ( $taxRates as $taxRate ) {
			$name                             = trim( strtolower( $taxRate->name ) );
			$this->maps['tax_rates'][ $name ] = $taxRate->rate;
			$this->maps['tax_names'][ $name ] = $taxRate->name;
		}
	}

	/**
	 * @param Invoice $invoice
	 */
	private function addInvoiceToMaps( Invoice $invoice ) {
		if ( $number = strtolower( trim( $invoice->number ) ) ) {
			$this->maps['invoices'][ $number ]                = $invoice;
			$this->maps['invoice'][ $number ]                 = $invoice->id;
			$this->maps['invoice_client'][ $number ]          = $invoice->client_id;
			$this->maps['invoice_ids'][ $invoice->public_id ] = $invoice->id;
		}
	}

	/**
	 * @param Client $client
	 */
	private function addClientToMaps( Client $client ) {
		if ( $name = strtolower( trim( $client->name ) ) ) {
			$this->maps['client'][ $name ]                  = $client->id;
			$this->maps['client_ids'][ $client->public_id ] = $client->id;
		}
		if ( $client->contacts->count() ) {
			$contact = $client->contacts[0];
			if ( $email = strtolower( trim( $contact->email ) ) ) {
				$this->maps['client'][ $email ] = $client->id;
			}
			if ( $name = strtolower( trim( $contact->first_name . ' ' . $contact->last_name ) ) ) {
				$this->maps['client'][ $name ] = $client->id;
			}
			$this->maps['client_ids'][ $client->public_id ] = $client->id;
		}
	}

	/**
	 * @param ClientContact $contact
	 */
	private function addContactToMaps( ClientContact $contact ) {
		if ( $key = strtolower( trim( $contact->email ) ) ) {
			$this->maps['contact'][ $key ] = $contact;
		}
	}

	/**
	 * @param Product $product
	 */
	private function addProductToMaps( Product $product ) {
		if ( $key = strtolower( trim( $product->product_key ) ) ) {
			$this->maps['product'][ $key ] = $product;
		}
	}

	/**
	 * @param Project $project
	 */
	private function addProjectToMaps( Project $project ) {
		if ( $key = strtolower( trim( $project->name ) ) ) {
			$this->maps['project'][ $key ] = $project;
		}
	}

	private function addVendorToMaps( Vendor $vendor ) {
		$this->maps['vendor'][ strtolower( $vendor->name ) ] = $vendor->id;
	}

	private function addExpenseCategoryToMaps( ExpenseCategory $category ) {
		if ( $name = strtolower( $category->name ) ) {
			$this->maps['expense_category'][ $name ] = $category->id;
		}
	}


	private function getUserIDForRecord( $record ) {
		if ( ! empty( $record['user_id'] ) ) {
			return $this->findUser( $record['user_id'] );
		} else {
			return $this->company->owner()->id;
		}
	}

	private function findUser( $user_hash ) {
		$user = User::where( 'company_id', $this->company->id )
					->where( \DB::raw( 'CONCAT_WS(" ", first_name, last_name)' ), 'like', '%' . $user_hash . '%' )
					->first();

		if ( $user ) {
			return $user->id;
		} else {
			return $this->company->owner()->id;
		}
	}

	private function getCsvData( $entityType ) {
		$base64_encoded_csv = Cache::get( $this->hash . '-' . $entityType );
		if ( empty( $base64_encoded_csv ) ) {
			return null;
		}

		$csv = base64_decode( $base64_encoded_csv );
		$csv = Reader::createFromString( $csv );

		$stmt = new Statement();
		$data = iterator_to_array( $stmt->process( $csv ) );

		if ( count( $data ) > 0 ) {
			$headers = $data[0];

			// Remove Invoice Ninja headers
			if ( count( $headers ) && count( $data ) > 4 && $this->import_type === 'csv' ) {
				$firstCell = $headers[0];
				if ( strstr( $firstCell, config( 'ninja.app_name' ) ) ) {
					array_shift( $data ); // Invoice Ninja...
					array_shift( $data ); // <blank line>
					array_shift( $data ); // Enitty Type Header
				}
			}
		}

		return $data;
	}
}