From 3297c70db4f72986bfc9ea7be60d75c294c83dc0 Mon Sep 17 00:00:00 2001
From: Tyler-A <Tyler.akins1999@gmail.com>
Date: Tue, 10 Sep 2019 20:33:20 -0600
Subject: [PATCH] Implement the choosing system.

---
 index.html     |  5 ++++-
 js/choosing.js | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 js/choosing.js
diff --git a/index.html b/index.html
index 7f0e1d6..7f2e9df 100644
--- a/index.html
+++ b/index.html
@@ -12,6 +12,7 @@
 
         <!-- JAVASCRIPT -->
         <script src="./js/add_choice.js"></script>
+        <script src="./js/choosing.js"></script>
     </head>
     <body>
         <template id="choice-template">
@@ -26,14 +27,16 @@
             <h2>Choices:</h2>
             <button onclick="add_choice()">Add New Choice</button>
             <br>
+            <div class="line"></div>
             <div id="choices">
                 <div class="choice">
-                    <div class="line"></div>
                     <input class="left" type="text" id="text-in-0" placeholder="Choice Name">
                     <input class="right" type="text" id="weight-in-0" placeholder="Choice Weighting">
                     <div class="line"></div>
                 </div>
             </div>
+            <button onclick="choose_option()">Choose</button>
+            <h2>Chosen Entry: <span id="result"></span></h2>
         </div>
     </body>
 </html>
\ No newline at end of file
diff --git a/js/choosing.js b/js/choosing.js
new file mode 100644
index 0000000..38a06ac
--- /dev/null
+++ b/js/choosing.js
@@ -0,0 +1,55 @@
+const construct_choices = () => {
+    let choices = document.getElementById("choices").children;
+    let start_of_next_range = 1;
+    let options = [];
+
+    // Construct the array for choosing
+    for (choice of choices) {
+        let name = choice.children[0].value;
+        let weight = parseInt(choice.children[1].value);
+
+        if (Number.isNaN(weight)) {
+            break;
+        };
+
+        options.push({
+            "name": name,
+            "min": start_of_next_range,
+            "max": start_of_next_range + weight - 1
+        });
+        start_of_next_range += weight;
+    };
+
+    return {
+        "choices": options,
+        "max_value": start_of_next_range - 1
+    };
+};
+
+
+const choose_option = () => {
+    let {choices, max_value} = construct_choices();
+
+    // No options, error
+    if (choices.length === 0 && max_value === 0) {
+        document.getElementById("result").innerText = "\nERROR: No Choices to pick from";
+        return;
+    }
+    
+    // Only one option exists, no need to waste time with randomness
+    else if (choices.length === 1) {
+        document.getElementById("result").innerText = choices[0].name
+    };
+
+
+    let chosen_value = Math.round(Math.random() * max_value);
+
+
+    // Find the choice which the randomly chosen number fits within
+    for (choice of choices) {
+        if (choice.min <= chosen_value <= choice.max) {
+            document.getElementById("result").innerText = choice.name;
+            return;
+        };
+    };
+};
\ No newline at end of file
