<?php

class WarehouseMovementController extends TTCrud {
    protected string $headerTitle = 'Lagerbewegung';
    protected string $createText = 'Bewegung erstellen';
    protected bool $reopenOnCreate = true;

    protected array $columns = [
        ['key' => 'movementNumber', 'text' => 'Bewegungs-Nr.', 'required' => false,
         'modal' => false,
         'table' => ['priority' => 10]],
        ['key' => 'movementType', 'text' => 'Typ', 'required' => true,
         'modal' => ['type' => 'select', 'items' => []],
         'table' => ['priority' => 9, 'filter' => 'iconSelect', 'filterOptions' => [
             ['value' => 'IN', 'text' => 'Einbuchung', 'icon' => 'fas fa-plus-circle text-success'],
             ['value' => 'OUT', 'text' => 'Ausbuchung', 'icon' => 'fas fa-minus-circle text-danger'],
             ['value' => 'ADJUSTMENT', 'text' => 'Korrektur', 'icon' => 'fas fa-edit text-warning'],
         ]]],
        ['key' => 'articleId', 'text' => 'Artikel', 'required' => true,
         'modal' => ['type' => 'articleSelect'],
         'table' => ['priority' => 8, 'sortable' => false, 'filter' => 'text']],
        ['key' => 'warehouseLocationId', 'text' => 'Lagerort', 'required' => true,
         'modal' => ['type' => 'select', 'items' => []],
         'table' => ['priority' => 7, 'filter' => 'select']],
        ['key' => 'quantity', 'text' => 'Menge', 'required' => true,
         'modal' => ['type' => 'number', 'step' => '0.01', 'min' => '0.01'],
         'table' => ['priority' => 6, 'filter' => false]],
        ['key' => 'quantityBefore', 'text' => 'Bestand vorher', 'required' => false,
         'modal' => false,
         'table' => ['priority' => 5, 'filter' => false]],
        ['key' => 'quantityAfter', 'text' => 'Bestand nachher', 'required' => false,
         'modal' => false,
         'table' => ['priority' => 4, 'filter' => false]],
        ['key' => 'reasonCategory', 'text' => 'Grund', 'required' => true,
         'modal' => ['type' => 'select', 'items' => [], 'dependsOn' => 'movementType'],
         'table' => ['priority' => 3, 'filter' => false]],
        ['key' => 'note', 'text' => 'Notiz', 'required' => false,
         'modal' => ['type' => 'textarea'],
         'table' => ['priority' => 2, 'filter' => false]],
        ['key' => 'create', 'text' => 'Erstellt', 'required' => false,
         'modal' => false,
         'table' => ['priority' => 1, 'filter' => 'dateRange']],
    ];

    protected array $additionalActions = [];

    protected array $permissionCheck = ['WarehouseUser'];

    protected array $infoMessages = [
        'create' => 'Lagerbewegung wurde erstellt',
        'update' => 'Lagerbewegung wurde aktualisiert',
        'delete' => 'Lagerbewegung wurde gelöscht',
        'noChanges' => 'Keine Änderungen',
    ];

    public function prepareCrudConfig() {
        // Populate movement type dropdown
        $movementTypes = [
            ['value' => 'IN', 'text' => 'Einbuchung'],
            ['value' => 'OUT', 'text' => 'Ausbuchung'],
            ['value' => 'ADJUSTMENT', 'text' => 'Korrektur'],
        ];

        // Populate locations dropdown (Office + Außenlager only)
        $allLocations = WarehouseLocationModel::getAll();
        $locations = [];
        foreach ($allLocations as $location) {
            $title = strtolower($location->title);
            if ($title === 'k1 fladnitz 150' || $title === 'aussenlager-extern') {
                $locations[] = ['value' => $location->id, 'text' => $location->title];
            }
        }

        // Get all reason categories for initial load
        $allReasons = WarehouseMovementModel::getReasonCategories();
        $reasonItems = [];
        foreach ($allReasons as $type => $categories) {
            foreach ($categories as $key => $label) {
                $reasonItems[] = ['value' => $key, 'text' => $label, 'group' => $type];
            }
        }

        foreach ($this->columns as &$col) {
            if ($col['key'] === 'movementType') {
                $col['modal']['items'] = $movementTypes;
            }
            if ($col['key'] === 'warehouseLocationId') {
                $col['modal']['items'] = $locations;
                $col['table']['filterOptions'] = $locations;
            }
            if ($col['key'] === 'reasonCategory') {
                $col['modal']['items'] = $reasonItems;
            }
        }

        $this->additionalJSVariables['REASON_CATEGORIES'] = $allReasons;
    }

    protected function beforeCreate(): bool {
        // Validate required fields
        $movementType = $this->postData['movementType'] ?? '';
        $articleId = intval($this->postData['articleId'] ?? 0);
        $locationId = intval($this->postData['warehouseLocationId'] ?? 0);
        $quantity = floatval($this->postData['quantity'] ?? 0);

        if (!in_array($movementType, ['IN', 'OUT', 'ADJUSTMENT'])) {
            $this->returnJson(['success' => false, 'message' => 'Ungültiger Bewegungstyp']);
            return false;
        }

        if ($articleId <= 0) {
            $this->returnJson(['success' => false, 'message' => 'Kein Artikel ausgewählt']);
            return false;
        }

        if ($locationId <= 0) {
            $this->returnJson(['success' => false, 'message' => 'Kein Lagerort ausgewählt']);
            return false;
        }

        if ($quantity <= 0) {
            $this->returnJson(['success' => false, 'message' => 'Menge muss größer als 0 sein']);
            return false;
        }

        // Find or create WarehouseItem for this article at this location
        $db = FronkDB::singleton();
        $existingItems = WarehouseItemModel::getAll([
            'articleId' => $articleId,
            'warehouseLocationId' => $locationId
        ]);

        $warehouseItem = count($existingItems) > 0 ? $existingItems[0] : null;
        $currentQty = $warehouseItem ? floatval($warehouseItem->quantity) : 0;

        // Calculate new quantity based on movement type
        // Note: Negative stock is allowed (items can be taken out even if stock is 0)
        switch ($movementType) {
            case 'IN':
                $newQty = $currentQty + $quantity;
                break;
            case 'OUT':
                $newQty = $currentQty - $quantity;
                // Negative stock is allowed - no validation needed
                break;
            case 'ADJUSTMENT':
                // For adjustment, quantity is the new absolute value
                $newQty = $quantity;
                break;
            default:
                $newQty = $currentQty;
        }

        // Store before/after quantities
        $this->postData['quantityBefore'] = $currentQty;
        $this->postData['quantityAfter'] = $newQty;
        $this->postData['userId'] = $this->user->id;

        // Update or create WarehouseItem
        if ($warehouseItem) {
            $db->query("UPDATE WarehouseItem SET quantity = {$newQty} WHERE id = {$warehouseItem->id}");
            $this->postData['warehouseItemId'] = $warehouseItem->id;
        } else {
            $db->query("INSERT INTO WarehouseItem (articleId, warehouseLocationId, quantity, createBy, `create`)
                        VALUES ({$articleId}, {$locationId}, {$newQty}, {$this->user->id}, " . time() . ")");
            $this->postData['warehouseItemId'] = $db->insert_id();
        }

        return true;
    }

    protected function afterCreate($postData) {
        // Generate movement number
        $movement = WarehouseMovementModel::get($postData['id']);
        if ($movement) {
            $movementNumber = WarehouseMovementModel::generateMovementNumber();
            $db = FronkDB::singleton();
            $db->query("UPDATE WarehouseMovement SET movementNumber = '{$movementNumber}' WHERE id = {$movement->id}");
        }
    }

    protected function customRowsHandler($rows) {
        return array_map(fn($row) => $this->formatRow((array)$row), $rows);
    }

    protected function formatRow($row) {
        $rawType = $row['movementType'];

        if (!empty($row['articleId'])) {
            $article = WarehouseArticleModel::get($row['articleId']);
            if ($article) {
                $row['articleId'] = "<strong>{$article->articleNumber}</strong><br><small class='text-muted'>{$article->title}</small>";
            }
        }

        $row['quantityBefore'] = $row['quantityBefore'] !== null ? number_format((float)$row['quantityBefore'], 2, ',', '.') : '-';
        $row['quantityAfter'] = $row['quantityAfter'] !== null ? number_format((float)$row['quantityAfter'], 2, ',', '.') : '-';
        $row['quantity'] = number_format((float)$row['quantity'], 2, ',', '.');

        $allCategories = WarehouseMovementModel::getReasonCategories();
        $row['reasonCategory'] = $allCategories[$rawType][$row['reasonCategory']] ?? $row['reasonCategory'];

        return $row;
    }

    /**
     * Get reason categories for a specific movement type
     */
    protected function getReasonCategoriesAction() {
        $type = $this->request->type ?? null;
        $categories = WarehouseMovementModel::getReasonCategories($type);

        if ($type && is_array($categories)) {
            $items = [];
            foreach ($categories as $key => $label) {
                $items[] = ['value' => $key, 'text' => $label];
            }
            self::returnJson(['success' => true, 'categories' => $items]);
        } else {
            self::returnJson(['success' => true, 'categories' => $categories]);
        }
    }

    /**
     * Get current stock for an article at a location
     */
    protected function getCurrentStockAction() {
        $articleId = intval($this->request->articleId ?? 0);
        $locationId = intval($this->request->locationId ?? 0);

        if (!$articleId || !$locationId) {
            self::returnJson(['success' => false, 'currentStock' => 0]);
            return;
        }

        $existingItems = WarehouseItemModel::getAll([
            'articleId' => $articleId,
            'warehouseLocationId' => $locationId
        ]);

        $currentStock = count($existingItems) > 0 ? floatval($existingItems[0]->quantity) : 0;

        self::returnJson(['success' => true, 'currentStock' => $currentStock]);
    }
}