From 0ad4d3a9592dcb8283b3f25ffd39f8c2bcfbdc3b Mon Sep 17 00:00:00 2001
From: guillermo <guillermo@verdnatura.es>
Date: Fri, 6 Sep 2024 13:50:49 +0200
Subject: [PATCH] feat: refs #7905 getBuysCsv

---
 loopback/util/flatten.js                      | 42 ++++++++++++++++++
 .../entry/back/methods/entry/getBuysCsv.js    | 44 +++++++++++++++++++
 modules/entry/back/models/entry.js            |  1 +
 3 files changed, 87 insertions(+)
 create mode 100644 loopback/util/flatten.js
 create mode 100644 modules/entry/back/methods/entry/getBuysCsv.js

diff --git a/loopback/util/flatten.js b/loopback/util/flatten.js
new file mode 100644
index 000000000..18d682d1f
--- /dev/null
+++ b/loopback/util/flatten.js
@@ -0,0 +1,42 @@
+/**
+ * Flattens an array of objects by converting each object into a flat structure.
+ *
+ * @param {Array} dataArray Array of objects to be flattened
+ * @return {Array} Array of flattened objects
+ */
+function flatten(dataArray) {
+    return dataArray.map(item => flattenObj(item.__data));
+}
+
+/**
+ * Recursively flattens an object, converting nested properties into a single level object
+ * with keys representing the original nested structure.
+ *
+ * @param {Object} data The object to be flattened
+ * @param {String} [prefix=''] Optional prefix for nested keys
+ * @return {Object} Flattened object
+ */
+function flattenObj(data, prefix = '') {
+    let result = {};
+    try {
+        for (let key in data) {
+            if (!data[key]) continue;
+
+            const newKey = prefix ? `${prefix}_${key}` : key;
+            const value = data[key];
+
+            if (typeof value === 'object' && value !== null && !Array.isArray(value))
+                Object.assign(result, flattenObj(value.__data, newKey));
+            else
+                result[newKey] = value;
+        }
+    } catch (error) {
+        console.error(error);
+    }
+
+    return result;
+}
+module.exports = {
+    flatten,
+    flattenObj,
+};
diff --git a/modules/entry/back/methods/entry/getBuysCsv.js b/modules/entry/back/methods/entry/getBuysCsv.js
new file mode 100644
index 000000000..4bd246fa0
--- /dev/null
+++ b/modules/entry/back/methods/entry/getBuysCsv.js
@@ -0,0 +1,44 @@
+const {toCSV} = require('vn-loopback/util/csv');
+const {flatten} = require('vn-loopback/util/flatten');
+const UserError = require('vn-loopback/util/user-error');
+
+module.exports = Self => {
+    Self.remoteMethodCtx('getBuysCsv', {
+        description: 'Returns buys for one entry in CSV file format',
+        accessType: 'READ',
+        accepts: [{
+            arg: 'id',
+            type: 'number',
+            required: true,
+            description: 'The entry id',
+            http: {source: 'path'}
+        }
+        ],
+        returns: [
+            {
+                arg: 'body',
+                type: 'file',
+                root: true
+            }, {
+                arg: 'Content-Type',
+                type: 'String',
+                http: {target: 'header'}
+            }, {
+                arg: 'Content-Disposition',
+                type: 'String',
+                http: {target: 'header'}
+            }
+        ],
+        http: {
+            path: `/:id/getBuysCsv`,
+            verb: 'GET'
+        }
+    });
+
+    Self.getBuysCsv = async(ctx, id, options) => {
+        const data = await Self.getBuys(ctx, id, null, options);
+        if (!data.length) throw new UserError('The entry has no lines or does not exist');
+        const dataFlatted = flatten(data);
+        return [toCSV(dataFlatted), 'text/csv', `inline; filename="buys-${id}.csv"`];
+    };
+};
diff --git a/modules/entry/back/models/entry.js b/modules/entry/back/models/entry.js
index b11d64415..8ca79f531 100644
--- a/modules/entry/back/models/entry.js
+++ b/modules/entry/back/models/entry.js
@@ -3,6 +3,7 @@ module.exports = Self => {
     require('../methods/entry/filter')(Self);
     require('../methods/entry/getEntry')(Self);
     require('../methods/entry/getBuys')(Self);
+    require('../methods/entry/getBuysCsv')(Self);
     require('../methods/entry/importBuys')(Self);
     require('../methods/entry/importBuysPreview')(Self);
     require('../methods/entry/lastItemBuys')(Self);