<?php

namespace App\Filament\Resources\ClientResource\RelationManagers;

use App\Actions\Transactions\CreateTransactionAction;
use App\Commands\Expenses\GenerateVoucher;
use App\DataObjects\CreateTransactionDTO;
use App\Models\Account;
use App\Models\Branch;
use App\Models\Client;
use Awcodes\TableRepeater\Components\TableRepeater;
use Awcodes\TableRepeater\Header;
use Filament\Forms;
use Filament\Forms\Components\DatePicker;
use Filament\Forms\Components\Hidden;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\TextInput;
use Filament\Forms\Form;
use Filament\Forms\Get;
use Filament\Forms\Set;
use Filament\Resources\RelationManagers\RelationManager;
use Filament\Tables;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\SoftDeletingScope;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Pipeline;

class ExpensesRelationManager extends RelationManager
{
    protected static string $relationship = 'expenses';

    protected static ?string $title = 'Expenses';

    public function form(Form $form): Form
    {
        return $form
            ->schema([
                Select::make('branch_id')
                    ->relationship('branch', 'code', fn (Builder $query) => $query->where('client_id', $this->getOwnerRecord()->id))
                    ->afterStateUpdated(function ($set, $get) {
                        $set('voucher_number', static::getVoucherNumber($get));
                        $set('transactions.*.branch_id', $get('branch_id'));
                    })
                    ->required()
                    ->live(),
                TextInput::make('supplier')->label('Supplier Name')->required(),
                TextInput::make('reference_number')->label('Reference Number'),
                TextInput::make('voucher_number')->label('Voucher Number')
                    ->default(fn ($get) => static::getVoucherNumber($get))
                    ->readOnly(),
                DatePicker::make('happened_on')->label('Date')
                    ->required()
                    ->afterStateUpdated(function ($set, $get) {
                        $set('transactions.*.happened_on', $get('happened_on'));
                    })
                    ->live()
                    ->native(false),

                TableRepeater::make('transactions')
                    ->headers(fn (Get $get): array => static::getTransactionTableHeader($get))
                    ->relationship('transactions')
                    ->schema(fn (Get $get): array => $this->getTransactionTableFormSchema($get))
                    ->visible(fn (Get $get) => $get('branch_id') != null)
                    ->columnSpan('full'),
            ]);
    }

    public static function getVoucherNumber(Get $get): string
    {
        $branch = Branch::find($get('branch_id'));

        if ($branch) {
            return GenerateVoucher::execute($branch);
        }

        return '';
    }

    private static function getTransactionTableHeader(Get $get): array
    {
        return [
            Header::make('Charge Account'),
            Header::make('Description'),
            Header::make('Gross Amount'),
            Header::make('Exempt'),
            Header::make('Zero Rated'),
            Header::make('Vatable Amount'),
            Header::make('Input Tax'),
            Header::make('Withholding Tax'),
            Header::make('Net Amount'),
        ];
    }

    private function getTransactionTableFormSchema(Get $get): array
    {
        return [
            Select::make('account_id')->options(fn ($get) => $this->getAccountOptions($get)),
            TextInput::make('description')->label('Description'),
            Hidden::make('branch_id')->default(fn (Get $get) => $get('../../branch_id')),
            TextInput::make('gross_amount')
                ->numeric()
                ->live(false, 500)
                ->afterStateUpdated(function (Get $get, Set $set, ?string $old, ?string $state) {
                    $this->setDefaultFormValues($get, $set, $old, $state);
                })->default(0),
            TextInput::make('exempt')
                ->numeric()
                ->live()
                ->afterStateUpdated(function (Get $get, Set $set, ?string $old, ?string $state) {
                    $this->setDefaultFormValues($get, $set, $old, $state);
                })->default(0),
            TextInput::make('zero_rated')
                ->numeric()
                ->live()
                ->afterStateUpdated(function (Get $get, Set $set, ?string $old, ?string $state) {

                    $this->setDefaultFormValues($get, $set, $old, $state);
                })->default(0),
            TextInput::make('vatable_amount')
                ->numeric()
                ->nullable()
                ->live()
                ->readOnly()
                ->default(0),
            Hidden::make('happened_on')->default(fn (Get $get) => $get('../../happened_on')),
            TextInput::make('input_tax')
                ->numeric()
                ->live()
                ->afterStateUpdated(function (Get $get, Set $set, ?string $old, ?string $state) {

                    $this->setDefaultFormValues($get, $set, $old, $state);
                })->default(0),
            TextInput::make('payable_withholding_tax')
                ->numeric()
                ->live()
                ->afterStateUpdated(function (Get $get, Set $set, ?string $old, ?string $state) {

                    $this->setDefaultFormValues($get, $set, $old, $state);
                })->default(0),
            TextInput::make('net_amount')->numeric()->default(0),
        ];
    }

    private function getAccountOptions(Get $get): Collection
    {
        $query = Account::query();

        $query->where([
            'client_id' => $this->getOwnerRecord()->id,
        ]);

        if ($get('../../branch_id')) {
            $query->whereHas('balances', function ($query) use ($get) {
                return $query->where('branch_id', $get('../../branch_id'));
            });
        }

        $query->whereHas('accountType', function ($query) {
            return $query->where('type', 'Expenses');
        });

        return $query->get()->pluck('account', 'id');
    }

    private function setDefaultFormValues(Get $get, Set $set, ?string $old, ?string $state): void
    {
        $exempt = (float) $get('exempt');
        $withHoldingTax = (float) $get('payable_withholding_tax');
        $vatableSales = $get('gross_amount');
        $vatableAmount = 0;
        if ($vatableSales) {
            $vatableAmount = $vatableSales / 1.12;
        }

        $inputTax = $vatableAmount * 0.12;

        $netAmount = (int) $vatableSales - $get('payable_withholding_tax');

        if ($this->getOwnerRecord()->vatable) {
            $netAmount = ($vatableAmount + $exempt) - $withHoldingTax;
        }

        $set('input_tax', number_format($inputTax, 2, '.', ''));
        $set('vatable_amount', number_format($vatableAmount, 2, '.', ''));
        $set('net_amount', number_format($netAmount, 2, '.', ''));
    }

    public function table(Table $table): Table
    {
        return $table
            ->recordTitleAttribute('supplier')
            ->columns([
                TextColumn::make('supplier'),
                TextColumn::make('reference_number'),
                TextColumn::make('voucher_number'),
                TextColumn::make('branch.code'),
                TextColumn::make('happened_on'),
            ])
            ->filters([
                //
            ])
            ->headerActions([
                Tables\Actions\CreateAction::make()
                    ->using(function (array $data, string $model) {
                        $transactions = $data['transactions'] ?? [];
                        $data = Arr::except($data, ['transactions']);
                        
                        $record = $model::create($data);

                        try {
                            $branch = $record->branch;
                
                            foreach ($transactions as $transaction) {
                
                                $tData = [
                                    'branch_id' => $branch->id,
                                    'happened_on' => $record->happened_on,
                                    ...$transaction,
                                ];
                
                                $payload = new CreateTransactionDTO(data: $tData, transactionable: $record);
                
                                Pipeline::send(passable: $payload)->through(
                                    [
                                        CreateTransactionAction::class,
                                    ]
                                )->thenReturn();
                            }
                        } catch (\Exception $exception) {
                            throw new \Exception('Failed to save transactions : '.$exception->getMessage());
                        }

                        return $record;
                    }),
            ])
            ->actions([
                Tables\Actions\EditAction::make(),
                Tables\Actions\DeleteAction::make(),
            ])
            ->bulkActions([
                Tables\Actions\BulkActionGroup::make([
                    Tables\Actions\DeleteBulkAction::make(),
                ]),
            ]);
    }
}