From 809704a717b198f5427bcdae3bf7ce8e8a764e2f Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Wed, 18 Dec 2024 21:25:08 +0200
Subject: hw(Web/3): Initial implementation

---
 Year 4/Web technologies/hw03.html |  23 ++++++++
 Year 4/Web technologies/hw03.php  | 117 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 Year 4/Web technologies/hw03.html
 create mode 100644 Year 4/Web technologies/hw03.php

diff --git a/Year 4/Web technologies/hw03.html b/Year 4/Web technologies/hw03.html
new file mode 100644
index 0000000..8d07170
--- /dev/null
+++ b/Year 4/Web technologies/hw03.html	
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="UTF-8">
+        <title>PHP Test</title>
+    </head>
+    <body>
+        <form action="./hw03.php" method="post">
+            <input type="text" name="name">
+            <input type="text" name="teacher">
+            <input type="text" name="description">
+            <input type="text" name="group">
+            <!-- <select name="group"> -->
+            <!--     <option value="m">М</option> -->
+            <!--     <option value="pm">ПМ</option> -->
+            <!--     <option value="okn">ОКН</option> -->
+            <!--     <option value="qkn">ЯКН</option> -->
+            <!-- </select> -->
+            <input type="text" name="credits">
+            <input type="submit" formaction="./hw03.php">
+        </form>
+    </body>
+</html>
diff --git a/Year 4/Web technologies/hw03.php b/Year 4/Web technologies/hw03.php
new file mode 100644
index 0000000..c7a591e
--- /dev/null
+++ b/Year 4/Web technologies/hw03.php	
@@ -0,0 +1,117 @@
+<?php
+abstract class Form {
+    const Name        = 'name';
+    const Teacher     = 'teacher';
+    const Description = 'description';
+    const Group       = 'group';
+    const Credits     = 'credits';
+
+    static function to_bg(string $name) {
+        switch ($name) {
+            case Form::Name:        return 'Име на учебен предмет';
+            case Form::Teacher:     return 'Преподавател';
+            case Form::Description: return 'Описание';
+            case Form::Group:       return 'Група';
+            case Form::Credits:     return 'Кредити';
+            default: throw new Exception("'$name' isn't an acceptable value!");
+        }
+    }
+}
+
+class Errors {
+    public $name;
+    public $teacher;
+    public $description;
+    public $group;
+    public $credits;
+
+    private static function get_error_submitted(string $name) {
+        if (!array_key_exists($name, $_POST) || mb_strlen($_POST[$name]) == 0) {
+            return Form::to_bg($name) . ' не е предадено! Полето е задължително!';
+        }
+    }
+
+    private static function get_error_len_min(string $name, int $min) {
+        if (mb_strlen($_POST[$name]) < $min) {
+            return Form::to_bg($name) . " е твърде късо! Дължината може да е минимум $min на брой символа!";
+        }
+    }
+
+    private static function get_error_len_max(string $name, int $max) {
+        if (mb_strlen($_POST[$name]) > $max) {
+            return Form::to_bg($name) . " е твърде дълго! Дължината може да е максимум $max на брой символа!";
+        }
+    }
+
+    private static function get_error_len(string $name, int $min, int $max) {
+        return Errors::get_error_len_min($name, $min) ??
+               Errors::get_error_len_max($name, $max);
+    }
+
+    private static function get_error_int(string $name) {
+        if (!is_numeric($_POST[$name])) {
+            return Form::to_bg($name) . " не е число!";
+        }
+        elseif (floor($_POST[$name]) != $_POST[$name]) {
+            return Form::to_bg($name) . " не е цяло число!";
+        }
+        elseif ($_POST[$name] <= 0) {
+            return Form::to_bg($name) . " не е положително число!";
+        }
+    }
+
+    public function __construct() {
+        $this->name = $this->get_error_submitted(Form::Name) ??
+                      $this->get_error_len(Form::Name, 2, 150);
+
+        $this->teacher = $this->get_error_submitted(Form::Teacher) ??
+                         $this->get_error_len(Form::Teacher, 3, 200);
+
+        $this->description = $this->get_error_submitted(Form::Description) ??
+                             $this->get_error_len_min(Form::Description, 10);
+
+        $this->group = $this->get_error_submitted(Form::Group);
+        if (is_null($this->group)) {
+            switch ($_POST[Form::Group]) {
+                case 'М': case 'ПМ': case 'ОКН': case 'ЯКН': break;
+                default: $this->group = Form::to_bg(Form::Group) . ' не е измежду М, ПМ, ОКН и ЯКН!';
+            }
+        }
+
+        $this->credits = $this->get_error_submitted(Form::Credits) ??
+                         $this->get_error_int(Form::Credits);
+    }
+
+    public function has_any() {
+        return !is_null($this->name) ||
+               !is_null($this->teacher) ||
+               !is_null($this->description) ||
+               !is_null($this->group) ||
+               !is_null($this->credits);
+    }
+
+    public function to_array() {
+        $output = array();
+        if (!is_null($this->name))        { $output[Form::Name] = $this->name; }
+        if (!is_null($this->teacher))     { $output[Form::Teacher] = $this->teacher; }
+        if (!is_null($this->description)) { $output[Form::Description] = $this->description; }
+        if (!is_null($this->group))       { $output[Form::Group] = $this->group; }
+        if (!is_null($this->credits))     { $output[Form::Credits] = $this->credits; }
+        return $output;
+    }
+}
+
+$errors = new Errors();
+
+if ($errors->has_any()) {
+    echo json_encode(
+        array(
+            "success" => false,
+            "errors" => $errors->to_array()
+        ),
+        JSON_UNESCAPED_UNICODE
+    );
+}
+else {
+    echo json_encode(array("success" => true));
+}
-- 
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