From 7be388c9f92109ddc77e65575a5bc7726a9ac1c6 Mon Sep 17 00:00:00 2001
From: Frank <frank@wuenscheonline.de>
Date: Sat, 21 Dec 2024 07:26:27 +0100
Subject: [PATCH] Golang backend implementation

to interact with the MySQL schema using a REST API. The backend will use the Gin framework for routing and GORM for database interaction.
---
 bamort/config.go                            |  23 +++++
 bamort/main.go                              | 109 ++++++++++++++++++++
 bamort/models.go                            |  43 ++++++++
 bamort/scripts/initial_steps.md             |   6 ++
 bamort/{sql => scripts}/mysql_structure.sql |   0
 bamort/tests/api_test.md                    |  18 ++++
 6 files changed, 199 insertions(+)
 create mode 100644 bamort/config.go
 create mode 100644 bamort/main.go
 create mode 100644 bamort/models.go
 create mode 100644 bamort/scripts/initial_steps.md
 rename bamort/{sql => scripts}/mysql_structure.sql (100%)
 create mode 100644 bamort/tests/api_test.md

diff --git a/bamort/config.go b/bamort/config.go
new file mode 100644
index 0000000..6ec7f3e
--- /dev/null
+++ b/bamort/config.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"log"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+var DB *gorm.DB
+
+func ConnectDatabase() {
+	dsn := "user:password@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
+	database, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	if err != nil {
+		log.Fatal("Failed to connect to database:", err)
+	}
+	DB = database
+}
+
+/*
+Replace user, password, and dbname with your MySQL credentials and database name.
+*/
diff --git a/bamort/main.go b/bamort/main.go
new file mode 100644
index 0000000..cf6c769
--- /dev/null
+++ b/bamort/main.go
@@ -0,0 +1,109 @@
+package main
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	ConnectDatabase()
+	DB.AutoMigrate(&User{}, &Character{}, &Eigenschaften{}) // Add other models here
+
+	r := gin.Default()
+
+	// Routes
+	r.POST("/register", RegisterUser)
+	r.POST("/login", LoginUser)
+	r.GET("/characters", GetCharacters)
+	r.POST("/characters", CreateCharacter)
+
+	r.Run(":8080") // Start server on port 8080
+}
+
+
+/*
+User Handlers
+
+Add handlers for user registration and login:
+*/
+package main
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"golang.org/x/crypto/bcrypt"
+)
+
+func RegisterUser(c *gin.Context) {
+	var user User
+	if err := c.ShouldBindJSON(&user); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(user.PasswordHash), bcrypt.DefaultCost)
+	user.PasswordHash = string(hashedPassword)
+
+	if err := DB.Create(&user).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create user"})
+		return
+	}
+
+	c.JSON(http.StatusCreated, gin.H{"message": "User registered successfully"})
+}
+
+func LoginUser(c *gin.Context) {
+	var user User
+	var input struct {
+		Username string `json:"username"`
+		Password string `json:"password"`
+	}
+
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if err := DB.Where("username = ?", input.Username).First(&user).Error; err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
+		return
+	}
+
+	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(input.Password)); err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Login successful"})
+}
+
+
+/*
+Character Handlers
+
+Add CRUD operations for characters:
+*/
+
+func GetCharacters(c *gin.Context) {
+	var characters []Character
+	if err := DB.Find(&characters).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to retrieve characters"})
+		return
+	}
+	c.JSON(http.StatusOK, characters)
+}
+
+func CreateCharacter(c *gin.Context) {
+	var character Character
+	if err := c.ShouldBindJSON(&character); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if err := DB.Create(&character).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create character"})
+		return
+	}
+
+	c.JSON(http.StatusCreated, character)
+}
diff --git a/bamort/models.go b/bamort/models.go
new file mode 100644
index 0000000..1749456
--- /dev/null
+++ b/bamort/models.go
@@ -0,0 +1,43 @@
+package main
+
+type User struct {
+	UserID       uint   `gorm:"primaryKey"`
+	Username     string `gorm:"unique"`
+	PasswordHash string
+	Email        string `gorm:"unique"`
+}
+
+type Character struct {
+	CharacterID uint `gorm:"primaryKey"`
+	UserID      uint `gorm:"index"`
+	Name        string
+	Rasse       string
+	Typ         string
+	Alter       int
+	Anrede      string
+	Grad        int
+	Groesse     int
+	Gewicht     int
+	Glaube      string
+	Hand        string
+	Image       string
+}
+
+type Eigenschaften struct {
+	EigenschaftenID uint `gorm:"primaryKey"`
+	CharacterID     uint `gorm:"index"`
+	Au              int
+	Gs              int
+	Gw              int
+	In              int
+	Ko              int
+	Pa              int
+	St              int
+	Wk              int
+	Zt              int
+}
+
+/*
+Define models for each table
+Add other models for Ausruestung, Fertigkeiten, etc., following the same pattern.
+*/
diff --git a/bamort/scripts/initial_steps.md b/bamort/scripts/initial_steps.md
new file mode 100644
index 0000000..f0906b1
--- /dev/null
+++ b/bamort/scripts/initial_steps.md
@@ -0,0 +1,6 @@
+# Install Dependencies
+## Install the necessary packages:
+
+go get -u github.com/gin-gonic/gin
+go get -u gorm.io/gorm
+go get -u gorm.io/driver/mysql
diff --git a/bamort/sql/mysql_structure.sql b/bamort/scripts/mysql_structure.sql
similarity index 100%
rename from bamort/sql/mysql_structure.sql
rename to bamort/scripts/mysql_structure.sql
diff --git a/bamort/tests/api_test.md b/bamort/tests/api_test.md
new file mode 100644
index 0000000..1e886b9
--- /dev/null
+++ b/bamort/tests/api_test.md
@@ -0,0 +1,18 @@
+/*
+API Testing
+
+    Register User:
+        POST /register
+        Body: { "username": "test", "password": "12345", "email": "test@example.com" }
+
+    Login User:
+        POST /login
+        Body: { "username": "test", "password": "12345" }
+
+    Create Character:
+        POST /characters
+        Body: { "user_id": 1, "name": "Hero", "rasse": "Elf", "typ": "Warrior", "alter": 25 }
+
+    Get Characters:
+        GET /characters
+*/
\ No newline at end of file