From 88cfe035e032e824c44e3b7bf41312d14a93f9ca Mon Sep 17 00:00:00 2001
From: Patryk Hegenberg <patryk-hegenberg@outlook.de>
Date: Fri, 15 Dec 2023 15:38:43 +0100
Subject: [PATCH] backend: frontend: add file load feature

added a feature to load existing json files and load the containing monsters
---
 handlers/load_file_handler.go | 46 +++++++++++++++++++++++++++++++++++
 main.go                       |  1 +
 templates/main.html           | 24 +++++++++++++++++-
 3 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 handlers/load_file_handler.go

diff --git a/handlers/load_file_handler.go b/handlers/load_file_handler.go
new file mode 100644
index 0000000..cfaaac4
--- /dev/null
+++ b/handlers/load_file_handler.go
@@ -0,0 +1,46 @@
+package handlers
+
+import (
+	"ddServer/model"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func LoadFileHandler(monsters *[]model.Monster) http.HandlerFunc {
+	log.Print("LoadFileHandler called")
+	return func(w http.ResponseWriter, r *http.Request) {
+		r.ParseMultipartForm(10 << 20) // 10 MB limit
+
+		// Get the file from the request
+		file, _, err := r.FormFile("uploadFile")
+		if err != nil {
+			http.Error(w, "Error retrieving file", http.StatusBadRequest)
+			return
+		}
+		defer file.Close()
+
+		// Parse the file content
+		decoder := json.NewDecoder(file)
+		var loadedChars model.Character
+		err = decoder.Decode(&loadedChars)
+		if err != nil {
+			http.Error(w, "Error decoding file content", http.StatusInternalServerError)
+			return
+		}
+
+		// Lock the Monsters slice and append the loaded monsters, then unlock the slice
+		mu.Lock()
+		defer mu.Unlock()
+
+		// Assuming 'loadedChars' contains an array of Monster objects
+		for _, monster := range loadedChars.Monster {
+			*monsters = append(*monsters, monster)
+		}
+
+		fmt.Printf("%v\n", monsters)
+		// Send a success response
+		http.Redirect(w, r, "/monsterTable", http.StatusTemporaryRedirect)
+	}
+}
diff --git a/main.go b/main.go
index d163e79..5bbd46f 100644
--- a/main.go
+++ b/main.go
@@ -37,6 +37,7 @@ func main() {
 	routes.HandleFunc("/contact", handlers.ContactHandler(content))
 	routes.HandleFunc("/monsterTable", handlers.MonsterTableHandler(content, &Monsters))
 	routes.HandleFunc("/calculate-skills", handlers.SkillCalculationHandler(content))
+	routes.HandleFunc("/loadFile", handlers.LoadFileHandler(&Monsters))
 	// Print the message indicating that 'static' has been included.
 	log.Printf("Eingebunden is %v\n", static)
 
diff --git a/templates/main.html b/templates/main.html
index ed4581f..53884fd 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -6,6 +6,28 @@
                 <p class="title is-4">Monster Form</p>
             </div>
             <div class="content">
+                <form hx-post="/loadFile" hx-encoding="multipart/form-data"
+                    _='on htmx:xhr:progress(loaded, total) set #progress.value to (loaded/total)*100'>
+                    <div class="file">
+                        <label class="file-label">
+                            <input class="file-input" type="file" name="uploadFile">
+                            <span class="file-cta">
+                                <span class="file-icon">
+                                    <i class="fas fa-upload"></i>
+                                </span>
+                                <span class="file-label">
+                                    Choose a file…
+                                </span>
+                            </span>
+                        </label>
+                    </div>
+                    <div class="field">
+                        <div class="control">
+                            <button class="button" type="button" hx-post="/loadFile" hx-trigger="click"
+                                hx-target="#monster-table" hx-swap="outerHTML">Press Me</button>
+                        </div>
+                    </div>
+                </form>
                 <form action="/submit" method="post" class="">
                     <div class="field">
                         <td><label for="filename">Filename:</label></td>
@@ -13,6 +35,7 @@
                                 class="input input-bordered w-full max-w-xs">
                         </div>
                     </div>
+                    {{ template "monsterform" . }}
                     <div class="field">
                         <div class="control">
                             <button type="button" hx-post="/addMonster" hx-trigger="click" hx-target="#monster-table"
@@ -20,7 +43,6 @@
                                 Monster</button>
                         </div>
                     </div>
-                    {{ template "monsterform" . }}
                     <input type="hidden" name="filename" value="{{.Filename}}">
                     <input type="submit" value="Submit" class="button is-primary">
                 </form>