feat : export Excel et stats par tranche d'âge sur l'inventaire bovin

- Dépendance phpoffice/phpspreadsheet - Endpoint GET /bovines/inventory-export : XLSX coloré, header figé, auto-filter, tri birthDate ASC - Endpoint GET /bovines/inventory-stats : comptes par tranche d'âge (>=24, 22-24, 20-22) - Bouton Excel à gauche du titre (style icône-only, même design que le bouton impression) - Légende visuelle avec cartes bordées coloriées - Ajustement seuils couleurs des lignes en -300 (base) / -400 (hover) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-24 15:19:57 +02:00
parent bde59bf9ee
commit 9038d1726a
8 changed files with 824 additions and 88 deletions
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
        "malio/ednotif-bundle": ">=0.0.6",
        "nelmio/cors-bundle": "^2.6",
        "phpdocumentor/reflection-docblock": "^5.6",
+        "phpoffice/phpspreadsheet": "^5.7",
        "phpstan/phpdoc-parser": "^2.3",
        "symfony/asset": "8.0.*",
        "symfony/console": "8.0.*",
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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        "This file is @generated automatically"
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@@ -1156,6 +1156,85 @@
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+                "phpstan/phpstan-strict-rules": "^1 || ^2",
+                "phpunit/phpunit": "^8 || ^9"
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+            "extra": {
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+                "MIT"
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+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
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+            "keywords": [
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+                "regex",
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@@ -2704,6 +2783,84 @@
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            "time": "2025-12-20T17:47:00+00:00"
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+                "guzzlehttp/guzzle": "^7.5",
+                "mikey179/vfsstream": "^1.6",
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+                "phpunit/phpunit": "^12.0",
+                "vimeo/psalm": "^6.0"
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+                    "email": "pabs@pablotron.org"
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+                    "email": "jonatan@maennchen.ch"
+                },
+                {
+                    "name": "Jesse Donat",
+                    "email": "donatj@gmail.com"
+                },
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+                    "name": "András Kolesár",
+                    "email": "kolesar@kolesar.hu"
+                }
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+            "description": "ZipStream is a library for dynamically streaming dynamic zip files from PHP without writing to the disk at all on the server.",
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+                "stream",
+                "zip"
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+                "source": "https://github.com/maennchen/ZipStream-PHP/tree/3.2.2"
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            "version": "v0.0.6",
@@ -2746,6 +2903,113 @@
            "description": "Client EDNOTIF (Guichet + wsIpBNotif) pour Symfony",
            "time": "2026-04-21T08:14:37+00:00"
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+            "license": [
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+                    "email": "mark@lange.demon.co.uk"
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+            "homepage": "https://github.com/MarkBaker/PHPComplex",
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+                "mathematics"
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+                "source": "https://github.com/MarkBaker/PHPComplex/tree/3.0.2"
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+            "source": {
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mark Baker",
+                    "email": "mark@demon-angel.eu"
+                }
+            ],
+            "description": "PHP Class for working with matrices",
+            "homepage": "https://github.com/MarkBaker/PHPMatrix",
+            "keywords": [
+                "mathematics",
+                "matrix",
+                "vector"
+            ],
+            "support": {
+                "issues": "https://github.com/MarkBaker/PHPMatrix/issues",
+                "source": "https://github.com/MarkBaker/PHPMatrix/tree/3.0.1"
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+            "time": "2022-12-02T22:17:43+00:00"
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        {
            "name": "masterminds/html5",
            "version": "2.10.0",
@@ -3156,6 +3420,115 @@
            },
            "time": "2025-11-21T15:09:14+00:00"
        },
+        {
+            "name": "phpoffice/phpspreadsheet",
+            "version": "5.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
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+                "reference": "9f55d3b9b7bcb1084fda8340e4b7ce4ed10cd0c8",
+                "shasum": ""
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+            "require": {
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+                "ext-ctype": "*",
+                "ext-dom": "*",
+                "ext-fileinfo": "*",
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+                "ext-gd": "*",
+                "ext-iconv": "*",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-simplexml": "*",
+                "ext-xml": "*",
+                "ext-xmlreader": "*",
+                "ext-xmlwriter": "*",
+                "ext-zip": "*",
+                "ext-zlib": "*",
+                "maennchen/zipstream-php": "^2.1 || ^3.0",
+                "markbaker/complex": "^3.0",
+                "markbaker/matrix": "^3.0",
+                "php": "^8.1",
+                "psr/simple-cache": "^1.0 || ^2.0 || ^3.0"
+            },
+            "require-dev": {
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+                "dompdf/dompdf": "^2.0 || ^3.0",
+                "ext-intl": "*",
+                "friendsofphp/php-cs-fixer": "^3.2",
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+                "phpstan/phpstan-phpunit": "^1.0 || ^2.0",
+                "phpunit/phpunit": "^10.5",
+                "squizlabs/php_codesniffer": "^3.7",
+                "tecnickcom/tcpdf": "^6.5"
+            },
+            "suggest": {
+                "dompdf/dompdf": "Option for rendering PDF with PDF Writer",
+                "ext-intl": "PHP Internationalization Functions, required for NumberFormat Wizard and StringHelper::setLocale()",
+                "mitoteam/jpgraph": "Option for rendering charts, or including charts with PDF or HTML Writers",
+                "mpdf/mpdf": "Option for rendering PDF with PDF Writer",
+                "tecnickcom/tcpdf": "Option for rendering PDF with PDF Writer"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "PhpOffice\\PhpSpreadsheet\\": "src/PhpSpreadsheet"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Maarten Balliauw",
+                    "homepage": "https://blog.maartenballiauw.be"
+                },
+                {
+                    "name": "Mark Baker",
+                    "homepage": "https://markbakeruk.net"
+                },
+                {
+                    "name": "Franck Lefevre",
+                    "homepage": "https://rootslabs.net"
+                },
+                {
+                    "name": "Erik Tilt"
+                },
+                {
+                    "name": "Adrien Crivelli"
+                },
+                {
+                    "name": "Owen Leibman"
+                }
+            ],
+            "description": "PHPSpreadsheet - Read, Create and Write Spreadsheet documents in PHP - Spreadsheet engine",
+            "homepage": "https://github.com/PHPOffice/PhpSpreadsheet",
+            "keywords": [
+                "OpenXML",
+                "excel",
+                "gnumeric",
+                "ods",
+                "php",
+                "spreadsheet",
+                "xls",
+                "xlsx"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/5.7.0"
+            },
+            "time": "2026-04-20T02:42:17+00:00"
+        },
        {
            "name": "phpstan/phpdoc-parser",
            "version": "2.3.1",
@@ -3509,6 +3882,57 @@
            },
            "time": "2024-09-11T13:17:53+00:00"
        },
+        {
+            "name": "psr/simple-cache",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/simple-cache.git",
+                "reference": "764e0b3939f5ca87cb904f570ef9be2d78a07865"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/php-fig/simple-cache/zipball/764e0b3939f5ca87cb904f570ef9be2d78a07865",
+                "reference": "764e0b3939f5ca87cb904f570ef9be2d78a07865",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.0.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\SimpleCache\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interfaces for simple caching",
+            "keywords": [
+                "cache",
+                "caching",
+                "psr",
+                "psr-16",
+                "simple-cache"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/simple-cache/tree/3.0.0"
+            },
+            "time": "2021-10-29T13:26:27+00:00"
+        },
        {
            "name": "sabberworm/php-css-parser",
            "version": "v9.1.0",
@@ -8393,85 +8817,6 @@
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-                "reference": "b2bed4734f0cc156ee1fe9c0da2550420d99a21e",
-                "shasum": ""
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-                "php": "^7.4 || ^8.0"
-            },
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-                "phpstan/phpstan": "<1.11.10"
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-            "require-dev": {
-                "phpstan/phpstan": "^1.12 || ^2",
-                "phpstan/phpstan-strict-rules": "^1 || ^2",
-                "phpunit/phpunit": "^8 || ^9"
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-            "license": [
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-            "authors": [
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-                    "name": "Jordi Boggiano",
-                    "email": "j.boggiano@seld.be",
-                    "homepage": "http://seld.be"
-                }
-            ],
-            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
-            "keywords": [
-                "PCRE",
-                "preg",
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-                    "type": "custom"
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-                    "type": "github"
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--- a/frontend/pages/infrastructure/case.vue
+++ b/frontend/pages/infrastructure/case.vue
@@ -211,9 +211,9 @@ const formatDate = (date: string | null) => {

 const rowClass = (item: BovineData): string => {
    if (item.ageMonths === null || item.ageMonths === undefined) return ''
-    if (item.ageMonths >= 24) return 'bg-violet-200 hover:bg-violet-300'
-    if (item.ageMonths >= 22) return 'bg-red-200 hover:bg-red-300'
-    if (item.ageMonths >= 20) return 'bg-orange-200 hover:bg-orange-300'
+    if (item.ageMonths >= 24) return 'bg-violet-300 hover:bg-violet-400'
+    if (item.ageMonths >= 22) return 'bg-red-300 hover:bg-red-400'
+    if (item.ageMonths >= 20) return 'bg-orange-300 hover:bg-orange-400'
    return ''
 }

--- a/frontend/pages/inventory.vue
+++ b/frontend/pages/inventory.vue
@@ -12,6 +12,14 @@
            <div class="flex items-center gap-3">
                <h1 class="font-bold text-3xl uppercase text-primary-500">Inventaire bovins</h1>
                <span class="text-lg text-slate-500">({{ totalItems }} bovin{{ totalItems > 1 ? 's' : '' }})</span>
+                <div
+                    class="bg-primary-500 p-1 rounded-md flex items-center cursor-pointer hover:opacity-80"
+                    :class="exporting ? 'cursor-not-allowed opacity-60' : ''"
+                    title="Exporter en Excel"
+                    @click="exportInventory"
+                >
+                    <Icon name="mdi:file-excel-outline" size="32" class="text-white" />
+                </div>
            </div>
            <button
                v-if="auth.isAdmin"
@@ -25,7 +33,22 @@
            </button>
        </div>

-        <div class="mt-6 mb-16">
+        <div class="flex flex-wrap gap-3 mt-4">
+            <div class="flex items-center gap-3 rounded-md border-2 border-violet-300 px-4 py-2">
+                <span class="text-2xl font-bold text-violet-700">{{ stats.over24 }}</span>
+                <span class="text-sm uppercase tracking-wide text-violet-700">≥ 24 mois</span>
+            </div>
+            <div class="flex items-center gap-3 rounded-md border-2 border-red-300 px-4 py-2">
+                <span class="text-2xl font-bold text-red-700">{{ stats.between22And24 }}</span>
+                <span class="text-sm uppercase tracking-wide text-red-700">22 – 24 mois</span>
+            </div>
+            <div class="flex items-center gap-3 rounded-md border-2 border-orange-300 px-4 py-2">
+                <span class="text-2xl font-bold text-orange-700">{{ stats.between20And22 }}</span>
+                <span class="text-sm uppercase tracking-wide text-orange-700">20 – 22 mois</span>
+            </div>
+        </div>
+
+        <div class="mt-6 mb-8">
            <UiDataTable
                v-model:page="page"
                v-model:per-page="perPage"
@@ -118,7 +141,52 @@ interface SyncResult {
    total: number
 }

+interface InventoryStats {
+    total: number
+    over24: number
+    between22And24: number
+    between20And22: number
+}
+
+const stats = ref<InventoryStats>({
+    total: 0,
+    over24: 0,
+    between22And24: 0,
+    between20And22: 0
+})
+
+const loadStats = async () => {
+    try {
+        stats.value = await api.get<InventoryStats>('bovines/inventory-stats', {}, { toast: false })
+    } catch {
+        // silencieux : l'écran reste utilisable sans la légende
+    }
+}
+
 const syncing = ref(false)
+const exporting = ref(false)
+
+const exportInventory = async () => {
+    if (exporting.value) return
+    exporting.value = true
+    try {
+        const blob = await api.getBlob('bovines/inventory-export')
+        const filename = `inventaire_bovins_${new Date().toISOString().slice(0, 10)}.xlsx`
+        const url = URL.createObjectURL(blob)
+        const a = document.createElement('a')
+        a.href = url
+        a.download = filename
+        a.style.display = 'none'
+        document.body.appendChild(a)
+        a.click()
+        a.remove()
+        setTimeout(() => URL.revokeObjectURL(url), 60_000)
+    } catch {
+        // toast déjà géré par useApi onResponseError
+    } finally {
+        exporting.value = false
+    }
+}

 const syncInventory = async () => {
    if (syncing.value) return
@@ -135,6 +203,7 @@ const syncInventory = async () => {
            message: `Créés : ${result.created} · Mis à jour : ${result.updated} · Sortis : ${result.exited} · Total EDNOTIF : ${result.total}`
        })
        reload()
+        loadStats()
    } catch {
        // error toast already handled by useApi onResponseError
    } finally {
@@ -211,11 +280,14 @@ const formatDate = (date: string | null) => {

 const rowClass = (item: BovineData): string => {
    if (item.ageMonths === null || item.ageMonths === undefined) return ''
-    if (item.ageMonths >= 24) return 'bg-violet-200 hover:bg-violet-300'
-    if (item.ageMonths >= 22) return 'bg-red-200 hover:bg-red-300'
-    if (item.ageMonths >= 20) return 'bg-orange-200 hover:bg-orange-300'
+    if (item.ageMonths >= 24) return 'bg-violet-300 hover:bg-violet-400'
+    if (item.ageMonths >= 22) return 'bg-red-300 hover:bg-red-400'
+    if (item.ageMonths >= 20) return 'bg-orange-300 hover:bg-orange-400'
    return ''
 }

-onMounted(reload)
+onMounted(() => {
+    reload()
+    loadStats()
+})
 </script>
--- a/src/ApiResource/BovineInventoryExport.php
+++ b/src/ApiResource/BovineInventoryExport.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiProperty;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\OpenApi\Model\Operation as OpenApiOperation;
+use App\State\Bovin\BovineInventoryExportProvider;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            uriTemplate: '/bovines/inventory-export',
+            openapi: new OpenApiOperation(
+                summary: "Export Excel de l'inventaire bovin actuel.",
+                description: "Retourne un fichier XLSX listant tous les bovins actifs (exitedAt IS NULL) triés par date de naissance croissante, avec colorisation des lignes selon l'âge.",
+                tags: ['Bovines'],
+            ),
+            security: "is_granted('ROLE_USER')",
+            output: false,
+            provider: BovineInventoryExportProvider::class,
+        ),
+    ]
+)]
+final class BovineInventoryExport
+{
+    #[ApiProperty(identifier: true)]
+    public string $id = 'current';
+}
--- a/src/ApiResource/BovineInventoryStats.php
+++ b/src/ApiResource/BovineInventoryStats.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiProperty;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\OpenApi\Model\Operation as OpenApiOperation;
+use App\State\Bovin\BovineInventoryStatsProvider;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            uriTemplate: '/bovines/inventory-stats',
+            openapi: new OpenApiOperation(
+                summary: "Compteurs de l'inventaire bovin par tranche d'âge.",
+                description: "Renvoie le nombre total de bovins actifs et la répartition par tranche d'âge (>= 24 mois, 22-24, 20-22).",
+                tags: ['Bovines'],
+            ),
+            security: "is_granted('ROLE_USER')",
+            provider: BovineInventoryStatsProvider::class,
+        ),
+    ]
+)]
+final class BovineInventoryStats
+{
+    #[ApiProperty(identifier: true)]
+    public string $id = 'current';
+
+    public int $total = 0;
+
+    public int $over24 = 0;
+
+    public int $between22And24 = 0;
+
+    public int $between20And22 = 0;
+}
--- a/src/State/Bovin/BovineInventoryExportProvider.php
+++ b/src/State/Bovin/BovineInventoryExportProvider.php
@@ -0,0 +1,206 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State\Bovin;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProviderInterface;
+use App\Entity\Bovine;
+use DateTimeImmutable;
+use Doctrine\ORM\EntityManagerInterface;
+use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Fill;
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * @implements ProviderInterface<Response>
+ */
+final class BovineInventoryExportProvider implements ProviderInterface
+{
+    private const HEADER_FILL = 'FFF1F5F9';
+
+    private const COLOR_VIOLET = 'FFC4B5FD';
+
+    private const COLOR_RED = 'FFFCA5A5';
+
+    private const COLOR_ORANGE = 'FFFDBA74';
+
+    private const HEADERS = [
+        'N° National',
+        'N° Travail',
+        'Sexe',
+        'Né le',
+        'Age (mois)',
+        'Race',
+        'Bâtiment',
+        'Case',
+        'Entrée le',
+    ];
+
+    private const COLUMN_WIDTHS = [18, 12, 10, 12, 12, 12, 30, 8, 12];
+
+    public function __construct(
+        private EntityManagerInterface $em,
+    ) {}
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): Response
+    {
+        $bovines = $this->em->createQueryBuilder()
+            ->select('b')
+            ->from(Bovine::class, 'b')
+            ->where('b.exitedAt IS NULL')
+            ->orderBy('b.birthDate', 'ASC')
+            ->getQuery()
+            ->getResult()
+        ;
+
+        $spreadsheet = $this->buildSpreadsheet($bovines);
+        $body        = $this->renderXlsx($spreadsheet);
+        $filename    = sprintf('inventaire_bovins_%s.xlsx', new DateTimeImmutable()->format('Y-m-d'));
+
+        $response = new Response($body);
+        $response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
+        $response->headers->set('Content-Disposition', sprintf('attachment; filename="%s"', $filename));
+        $response->headers->set('Content-Length', (string) strlen($body));
+
+        return $response;
+    }
+
+    /**
+     * @param list<Bovine> $bovines
+     */
+    private function buildSpreadsheet(array $bovines): Spreadsheet
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet       = $spreadsheet->getActiveSheet();
+        $sheet->setTitle('Inventaire');
+
+        // Header row
+        foreach (self::HEADERS as $index => $label) {
+            $sheet->setCellValue([$index + 1, 1], $label);
+        }
+
+        $lastColumn  = $sheet->getHighestColumn();
+        $headerRange = sprintf('A1:%s1', $lastColumn);
+        $sheet->getStyle($headerRange)->applyFromArray([
+            'font'      => ['bold' => true],
+            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER],
+            'fill'      => [
+                'fillType'   => Fill::FILL_SOLID,
+                'startColor' => ['argb' => self::HEADER_FILL],
+            ],
+            'borders' => [
+                'allBorders' => ['borderStyle' => Border::BORDER_THIN],
+            ],
+        ]);
+
+        // Column widths
+        foreach (self::COLUMN_WIDTHS as $index => $width) {
+            $sheet->getColumnDimension(Coordinate::stringFromColumnIndex($index + 1))->setWidth($width);
+        }
+
+        // N° National et N° Travail : valeurs numériques mais conservées en string
+        // (leading zeros, format métier) — on force le format texte pour éviter
+        // l'avertissement Excel "nombre stocké sous forme de texte".
+        $sheet->getStyle('A')->getNumberFormat()->setFormatCode(NumberFormat::FORMAT_TEXT);
+        $sheet->getStyle('B')->getNumberFormat()->setFormatCode(NumberFormat::FORMAT_TEXT);
+
+        // Data rows
+        $rowNumber = 2;
+        foreach ($bovines as $bovine) {
+            $values = $this->formatRow($bovine);
+            foreach ($values as $colIndex => $value) {
+                $sheet->setCellValue([$colIndex + 1, $rowNumber], $value);
+            }
+
+            $color = $this->ageColor($bovine->getAgeMonths());
+            if (null !== $color) {
+                $rowRange = sprintf('A%d:%s%d', $rowNumber, $lastColumn, $rowNumber);
+                $sheet->getStyle($rowRange)->applyFromArray([
+                    'fill' => [
+                        'fillType'   => Fill::FILL_SOLID,
+                        'startColor' => ['argb' => $color],
+                    ],
+                ]);
+            }
+
+            ++$rowNumber;
+        }
+
+        // Freeze header row + auto-filter
+        $sheet->freezePane('A2');
+        if ($rowNumber > 2) {
+            $sheet->setAutoFilter(sprintf('%s:%s%d', 'A1', $lastColumn, $rowNumber - 1));
+        } else {
+            $sheet->setAutoFilter($headerRange);
+        }
+
+        return $spreadsheet;
+    }
+
+    /**
+     * @return list<null|int|string>
+     */
+    private function formatRow(Bovine $bovine): array
+    {
+        return [
+            $bovine->getNationalNumber(),
+            $bovine->getWorkNumber(),
+            $this->formatSex($bovine->getSex()),
+            $this->formatDate($bovine->getBirthDate()),
+            $bovine->getAgeMonths(),
+            $bovine->getBreedCode(),
+            $bovine->getBuildingCase()?->getIdBuilding()?->getLabel(),
+            $bovine->getBuildingCase()?->getCaseNumber(),
+            $this->formatDate($bovine->getArrivalDate()),
+        ];
+    }
+
+    private function formatSex(?string $sex): ?string
+    {
+        return match ($sex) {
+            'M'     => 'Mâle',
+            'F'     => 'Femelle',
+            default => $sex,
+        };
+    }
+
+    private function formatDate(?DateTimeImmutable $date): ?string
+    {
+        return $date?->format('d/m/Y');
+    }
+
+    private function ageColor(?int $ageMonths): ?string
+    {
+        if (null === $ageMonths) {
+            return null;
+        }
+        if ($ageMonths >= 24) {
+            return self::COLOR_VIOLET;
+        }
+        if ($ageMonths >= 22) {
+            return self::COLOR_RED;
+        }
+        if ($ageMonths >= 20) {
+            return self::COLOR_ORANGE;
+        }
+
+        return null;
+    }
+
+    private function renderXlsx(Spreadsheet $spreadsheet): string
+    {
+        $writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
+        ob_start();
+        $writer->save('php://output');
+        $body = ob_get_clean();
+
+        return false !== $body ? $body : '';
+    }
+}
--- a/src/State/Bovin/BovineInventoryStatsProvider.php
+++ b/src/State/Bovin/BovineInventoryStatsProvider.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State\Bovin;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProviderInterface;
+use App\ApiResource\BovineInventoryStats;
+use Doctrine\DBAL\Connection;
+
+/**
+ * @implements ProviderInterface<BovineInventoryStats>
+ */
+final class BovineInventoryStatsProvider implements ProviderInterface
+{
+    public function __construct(
+        private Connection $connection,
+    ) {}
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): BovineInventoryStats
+    {
+        $row = $this->connection->fetchAssociative(<<<'SQL'
+            SELECT
+                COUNT(*) AS total,
+                COUNT(*) FILTER (WHERE age_months >= 24) AS over_24,
+                COUNT(*) FILTER (WHERE age_months >= 22 AND age_months < 24) AS between_22_and_24,
+                COUNT(*) FILTER (WHERE age_months >= 20 AND age_months < 22) AS between_20_and_22
+            FROM bovine
+            WHERE exited_at IS NULL
+            SQL);
+
+        $stats                 = new BovineInventoryStats();
+        $stats->total          = (int) ($row['total'] ?? 0);
+        $stats->over24         = (int) ($row['over_24'] ?? 0);
+        $stats->between22And24 = (int) ($row['between_22_and_24'] ?? 0);
+        $stats->between20And22 = (int) ($row['between_20_and_22'] ?? 0);
+
+        return $stats;
+    }
+}