<?php

require_once APPDIR . 'MobileApp/Shared/MobileAppBaseHandler.php';

class InventurHandler extends MobileAppBaseHandler {

    protected $requiredPermission = 'WarehouseUser';

    public function getActiveStocktakesAction() {
        $stocktakes = WarehouseStocktakeModel::getAll(['status' => 'in_progress']);

        $result = [];
        foreach ($stocktakes as $stocktake) {
            $location = $stocktake->getLocation();
            $result[] = [
                'id' => $stocktake->id,
                'stocktakeNumber' => $stocktake->stocktakeNumber,
                'title' => $stocktake->title,
                'locationName' => $location ? $location->title : 'Unbekannt',
                'totalScannedItems' => $stocktake->totalScannedItems,
                'startedAt' => $stocktake->startedAt ? date('d.m.Y H:i', $stocktake->startedAt) : null,
            ];
        }

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

    public function getStocktakeAction() {
        $id = intval($this->request->id);
        if (!$id) {
            self::returnJson(['success' => false, 'message' => 'Keine Inventur-ID angegeben']);
            return;
        }

        $stocktake = WarehouseStocktakeModel::get($id);
        if (!$stocktake) {
            self::returnJson(['success' => false, 'message' => 'Inventur nicht gefunden']);
            return;
        }

        $location = $stocktake->getLocation();

        self::returnJson([
            'success' => true,
            'stocktake' => [
                'id' => $stocktake->id,
                'stocktakeNumber' => $stocktake->stocktakeNumber,
                'title' => $stocktake->title,
                'status' => $stocktake->status,
                'locationId' => $stocktake->warehouseLocationId,
                'locationName' => $location ? $location->title : 'Unbekannt',
                'totalScannedItems' => $stocktake->totalScannedItems,
                'startedAt' => $stocktake->startedAt ? date('d.m.Y H:i', $stocktake->startedAt) : null,
            ]
        ]);
    }

    public function getArticleAction() {
        $code = $this->request->code;

        if (!$code) {
            self::returnJson(['success' => false, 'message' => 'Kein Code angegeben']);
            return;
        }

        $articleId = null;

        if (preg_match('/^(?:WA|WH):(\d+):/', $code, $matches)) {
            $articleId = intval($matches[1]);
        } else {
            $article = WarehouseArticleModel::getFirst(['articleNumber' => $code]);
            if ($article) {
                $articleId = $article->id;
            }
        }

        if (!$articleId) {
            self::returnJson(['success' => false, 'message' => 'Artikel nicht gefunden']);
            return;
        }

        $article = WarehouseArticleModel::get($articleId);
        if (!$article) {
            self::returnJson(['success' => false, 'message' => 'Artikel nicht gefunden']);
            return;
        }

        $category = WarehouseCategory::get($article->category_id);

        self::returnJson([
            'success' => true,
            'article' => [
                'id' => $article->id,
                'articleNumber' => $article->articleNumber,
                'title' => $article->title,
                'description' => $article->description ?? '',
                'unit' => $article->unit ?? 'Stk.',
                'categoryName' => $category ? $category->name : '',
            ]
        ]);
    }

    public function searchArticlesAction() {
        $query = $this->request->query ?? '';
        $categoryId = intval($this->request->categoryId ?? 0);

        $db = $this->db();
        $conditions = ["(isEndOfLife IS NULL OR isEndOfLife = 0)"];

        if ($query && strlen($query) >= 2) {
            $escapedQuery = $db->escape($query);
            $conditions[] = "(articleNumber LIKE '%{$escapedQuery}%' OR title LIKE '%{$escapedQuery}%' OR description LIKE '%{$escapedQuery}%')";
        }

        if ($categoryId > 0) {
            $conditions[] = "category_id = {$categoryId}";
        }

        if (count($conditions) === 1 && !$categoryId) {
            self::returnJson(['success' => true, 'articles' => []]);
            return;
        }

        $whereClause = implode(' AND ', $conditions);
        $result = $db->query("SELECT id, articleNumber, title, unit, category_id
                              FROM WarehouseArticle
                              WHERE {$whereClause}
                              ORDER BY title ASC
                              LIMIT 50");

        $articles = [];
        while ($row = $result->fetch_assoc()) {
            $articles[] = [
                'id' => intval($row['id']),
                'articleNumber' => $row['articleNumber'],
                'title' => $row['title'],
                'unit' => $row['unit'] ?? 'Stk.',
                'categoryId' => intval($row['category_id'] ?? 0),
            ];
        }

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

    public function getCategoriesAction() {
        $db = $this->db();
        $res = $db->query("SELECT id, name FROM WarehouseCategory ORDER BY name ASC");

        $categories = [];
        while ($row = $res->fetch_assoc()) {
            $categories[] = [
                'id' => intval($row['id']),
                'name' => $row['name'],
            ];
        }
        self::returnJson(['success' => true, 'categories' => $categories]);
    }

    public function checkAlreadyScannedAction() {
        $stocktakeId = intval($this->request->stocktakeId);
        $articleId = intval($this->request->articleId);

        if (!$stocktakeId || !$articleId) {
            self::returnJson(['success' => false, 'message' => 'Fehlende Parameter']);
            return;
        }

        $existing = WarehouseStocktakeItemModel::getFirst([
            'stocktakeId' => $stocktakeId,
            'articleId' => $articleId,
            'overwrittenById' => null
        ]);

        if ($existing) {
            $db = $this->db();
            $scannedByResult = $db->query("SELECT name FROM Worker WHERE id = {$existing->scannedBy}");
            $scannedByRow = $scannedByResult->fetch_assoc();

            self::returnJson([
                'success' => true,
                'alreadyScanned' => true,
                'existingItem' => [
                    'id' => $existing->id,
                    'countedQuantity' => $existing->countedQuantity,
                    'scannedAt' => $existing->scannedAt ? date('d.m.Y H:i', $existing->scannedAt) : null,
                    'scannedBy' => $scannedByRow ? $scannedByRow['name'] : 'Unbekannt',
                ]
            ]);
        } else {
            self::returnJson(['success' => true, 'alreadyScanned' => false]);
        }
    }

    public function submitScanAction() {
        $postData = $this->getPostData();

        $stocktakeId = intval($postData['stocktakeId'] ?? 0);
        $articleId = intval($postData['articleId'] ?? 0);
        $quantity = floatval($postData['quantity'] ?? 0);
        $rack = $postData['rack'] ?? null;
        $shelf = $postData['shelf'] ?? null;
        $note = $postData['note'] ?? null;
        $overwrite = boolval($postData['overwrite'] ?? false);
        $overwriteItemId = intval($postData['overwriteItemId'] ?? 0);

        if (!$stocktakeId || !$articleId) {
            self::returnJson(['success' => false, 'message' => 'Fehlende Parameter']);
            return;
        }

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

        $stocktake = WarehouseStocktakeModel::get($stocktakeId);
        if (!$stocktake) {
            self::returnJson(['success' => false, 'message' => 'Inventur nicht gefunden']);
            return;
        }

        if ($stocktake->status !== 'in_progress') {
            self::returnJson(['success' => false, 'message' => 'Inventur ist nicht aktiv']);
            return;
        }

        $article = WarehouseArticleModel::get($articleId);
        if (!$article) {
            self::returnJson(['success' => false, 'message' => 'Artikel nicht gefunden']);
            return;
        }

        $db = $this->db();

        if ($overwrite && $overwriteItemId) {
            $db->query("INSERT INTO WarehouseStocktakeItem
                        (stocktakeId, articleId, countedQuantity, rack, shelf, note, scannedAt, scannedBy, createBy, `create`)
                        VALUES ({$stocktakeId}, {$articleId}, {$quantity},
                        " . ($rack ? "'{$db->escape($rack)}'" : "NULL") . ",
                        " . ($shelf ? "'{$db->escape($shelf)}'" : "NULL") . ",
                        " . ($note ? "'{$db->escape($note)}'" : "NULL") . ",
                        " . time() . ", {$this->user->id}, {$this->user->id}, " . time() . ")");

            $itemId = $db->insert_id;
            $db->query("UPDATE WarehouseStocktakeItem SET overwrittenById = {$itemId} WHERE id = {$overwriteItemId}");
            $finalQuantity = $quantity;

            WarehouseStocktakeLogModel::log($stocktakeId, 'overwritten', $itemId, [
                'articleId' => $articleId,
                'articleNumber' => $article->articleNumber,
                'articleTitle' => $article->title,
                'quantity' => $quantity,
                'overwrittenItemId' => $overwriteItemId,
            ]);

            $stocktake->updateProgress();

            self::returnJson([
                'success' => true,
                'message' => "'{$article->title}' überschrieben ({$quantity} {$article->unit})",
                'item' => [
                    'id' => $itemId,
                    'articleId' => $articleId,
                    'articleNumber' => $article->articleNumber,
                    'articleTitle' => $article->title,
                    'countedQuantity' => $finalQuantity,
                    'unit' => $article->unit ?? 'Stk.',
                    'rack' => $rack,
                    'shelf' => $shelf,
                    'isOverwrite' => true,
                ]
            ]);
            return;
        }

        $existing = WarehouseStocktakeItemModel::getFirst([
            'stocktakeId' => $stocktakeId,
            'articleId' => $articleId,
            'overwrittenById' => null
        ]);

        if ($existing) {
            $newQuantity = $existing->countedQuantity + $quantity;
            $db->query("UPDATE WarehouseStocktakeItem SET
                        countedQuantity = {$newQuantity},
                        rack = " . ($rack ? "'{$db->escape($rack)}'" : "rack") . ",
                        shelf = " . ($shelf ? "'{$db->escape($shelf)}'" : "shelf") . ",
                        scannedAt = " . time() . ",
                        scannedBy = {$this->user->id}
                        WHERE id = {$existing->id}");

            $itemId = $existing->id;
            $finalQuantity = $newQuantity;
            $isUpdate = true;
        } else {
            $db->query("INSERT INTO WarehouseStocktakeItem
                        (stocktakeId, articleId, countedQuantity, rack, shelf, note, scannedAt, scannedBy, createBy, `create`)
                        VALUES ({$stocktakeId}, {$articleId}, {$quantity},
                        " . ($rack ? "'{$db->escape($rack)}'" : "NULL") . ",
                        " . ($shelf ? "'{$db->escape($shelf)}'" : "NULL") . ",
                        " . ($note ? "'{$db->escape($note)}'" : "NULL") . ",
                        " . time() . ", {$this->user->id}, {$this->user->id}, " . time() . ")");

            $itemId = $db->insert_id;
            $finalQuantity = $quantity;
            $isUpdate = false;
        }

        $stocktake->updateProgress();

        WarehouseStocktakeLogModel::log($stocktakeId, 'scanned', $itemId, [
            'articleId' => $articleId,
            'articleNumber' => $article->articleNumber,
            'articleTitle' => $article->title,
            'quantity' => $quantity,
            'totalQuantity' => $finalQuantity,
            'rack' => $rack,
            'shelf' => $shelf,
            'isUpdate' => $isUpdate,
        ]);

        self::returnJson([
            'success' => true,
            'message' => $isUpdate
                ? "Menge für '{$article->title}' erhöht auf {$finalQuantity}"
                : "'{$article->title}' hinzugefügt ({$quantity} {$article->unit})",
            'item' => [
                'id' => $itemId,
                'articleId' => $articleId,
                'articleNumber' => $article->articleNumber,
                'articleTitle' => $article->title,
                'countedQuantity' => $finalQuantity,
                'unit' => $article->unit ?? 'Stk.',
                'rack' => $rack,
                'shelf' => $shelf,
                'isUpdate' => $isUpdate,
            ]
        ]);
    }

    public function getMyScansAction() {
        $stocktakeId = intval($this->request->stocktakeId);

        if (!$stocktakeId) {
            self::returnJson(['success' => false, 'message' => 'Keine Inventur-ID angegeben']);
            return;
        }

        $db = $this->db();
        $result = $db->query("SELECT si.*, wa.articleNumber, wa.title as articleTitle, wa.unit
                              FROM WarehouseStocktakeItem si
                              JOIN WarehouseArticle wa ON wa.id = si.articleId
                              WHERE si.stocktakeId = {$stocktakeId}
                              AND si.scannedBy = {$this->user->id}
                              ORDER BY si.scannedAt DESC
                              LIMIT 50");

        $items = [];
        while ($row = $result->fetch_assoc()) {
            $items[] = [
                'id' => intval($row['id']),
                'articleId' => intval($row['articleId']),
                'articleNumber' => $row['articleNumber'],
                'articleTitle' => $row['articleTitle'],
                'countedQuantity' => floatval($row['countedQuantity']),
                'unit' => $row['unit'] ?? 'Stk.',
                'rack' => $row['rack'],
                'shelf' => $row['shelf'],
                'scannedAt' => $row['scannedAt'] ? date('H:i', $row['scannedAt']) : null,
            ];
        }

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

    public function getProgressAction() {
        $stocktakeId = intval($this->request->stocktakeId);

        if (!$stocktakeId) {
            self::returnJson(['success' => false, 'message' => 'Keine Inventur-ID angegeben']);
            return;
        }

        $stocktake = WarehouseStocktakeModel::get($stocktakeId);
        if (!$stocktake) {
            self::returnJson(['success' => false, 'message' => 'Inventur nicht gefunden']);
            return;
        }

        $db = $this->db();

        $totalResult = $db->query("SELECT COUNT(*) as count FROM WarehouseStocktakeItem WHERE stocktakeId = {$stocktakeId}");
        $totalRow = $totalResult->fetch_assoc();
        $totalScanned = intval($totalRow['count']);

        $myResult = $db->query("SELECT COUNT(*) as count FROM WarehouseStocktakeItem WHERE stocktakeId = {$stocktakeId} AND scannedBy = {$this->user->id}");
        $myRow = $myResult->fetch_assoc();
        $myScanned = intval($myRow['count']);

        self::returnJson([
            'success' => true,
            'progress' => [
                'totalScanned' => $totalScanned,
                'myScanned' => $myScanned,
                'status' => $stocktake->status,
            ]
        ]);
    }
}