feat: introduce Joi validation schemas and integrate them across various controllers for categories, lessons, courses, chapters, announcements, and admin course approvals.

Backend/src/validators/announcements.validator.ts

@@ -0,0 +1,72 @@
+import Joi from 'joi';
+
+/**
+ * Validator for creating an announcement
+ */
+export const CreateAnnouncementValidator = Joi.object({
+    title: Joi.object({
+        th: Joi.string().required().messages({
+            'any.required': 'Thai title is required'
+        }),
+        en: Joi.string().required().messages({
+            'any.required': 'English title is required'
+        })
+    }).required().messages({
+        'any.required': 'Title is required'
+    }),
+    content: Joi.object({
+        th: Joi.string().required().messages({
+            'any.required': 'Thai content is required'
+        }),
+        en: Joi.string().required().messages({
+            'any.required': 'English content is required'
+        })
+    }).required().messages({
+        'any.required': 'Content is required'
+    }),
+    status: Joi.string()
+        .valid('DRAFT', 'PUBLISHED', 'ARCHIVED')
+        .required()
+        .messages({
+            'any.only': 'Status must be one of: DRAFT, PUBLISHED, ARCHIVED',
+            'any.required': 'Status is required'
+        }),
+    is_pinned: Joi.boolean()
+        .required()
+        .messages({
+            'any.required': 'is_pinned is required'
+        }),
+    published_at: Joi.string()
+        .isoDate()
+        .optional()
+        .messages({
+            'string.isoDate': 'published_at must be a valid ISO date string'
+        })
+});
+
+/**
+ * Validator for updating an announcement
+ */
+export const UpdateAnnouncementValidator = Joi.object({
+    title: Joi.object({
+        th: Joi.string().optional(),
+        en: Joi.string().optional()
+    }).optional(),
+    content: Joi.object({
+        th: Joi.string().optional(),
+        en: Joi.string().optional()
+    }).optional(),
+    status: Joi.string()
+        .valid('DRAFT', 'PUBLISHED', 'ARCHIVED')
+        .optional()
+        .messages({
+            'any.only': 'Status must be one of: DRAFT, PUBLISHED, ARCHIVED'
+        }),
+    is_pinned: Joi.boolean().optional(),
+    published_at: Joi.string()
+        .isoDate()
+        .optional()
+        .messages({
+            'string.isoDate': 'published_at must be a valid ISO date string'
+        })
+});