first commit

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+
+#repo specific files
+tms.exe
+training.db

go.mod

@@ -0,0 +1,5 @@
+module tms
+
+go 1.22.0
+
+require github.com/mattn/go-sqlite3 v1.14.24 // indirect

go.sum

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+github.com/mattn/go-sqlite3 v1.14.24 h1:tpSp2G2KyMnnQu99ngJ47EIkWVmliIizyZBfPrBWDRM=
+github.com/mattn/go-sqlite3 v1.14.24/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=

main.go

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+package main
+
+import (
+	"database/sql"
+	"embed"
+	"fmt"
+	"html/template"
+	"net/http"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+//go:embed templates/*
+var templatesFS embed.FS
+
+//go:embed schema.sql
+var schemaSQL string
+
+type Trainer struct {
+	ID    int
+	Name  string
+	Email string
+	Areas []TrainingArea
+}
+
+type Training struct {
+	ID           int
+	Title        string
+	TrainingType string
+	Mode         string
+	Start        time.Time
+	End          time.Time
+	Status       string
+	Trainers     []Trainer
+	Area         TrainingArea
+}
+
+type TrainingArea struct {
+	ID       int
+	Name     string
+	Trainers []Trainer
+}
+
+func (ta TrainingArea) IsTrainerAssigned(trainerID int) bool {
+	if ta.Trainers == nil {
+		return false
+	}
+
+	for _, trainer := range ta.Trainers {
+		if trainer.ID == trainerID {
+			return true
+		}
+	}
+
+	return false
+}
+
+var db *sql.DB
+
+func initDB() {
+	var err error
+	db, err = sql.Open("sqlite3", "training.db")
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = db.Exec(schemaSQL)
+	if err != nil {
+		panic(err)
+	}
+}
+
+var tmpl *template.Template
+
+func initTemplates() {
+	var err error
+	tmpl, err = template.ParseFS(templatesFS, "templates/*.html")
+	if err != nil {
+		panic(fmt.Sprintf("Error parsing templates: %v", err))
+	}
+}
+
+func homeHandler(w http.ResponseWriter, r *http.Request) {
+	err := tmpl.ExecuteTemplate(w, "home.html", nil)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+	}
+}
+
+func trainingAreaListHandler(w http.ResponseWriter, r *http.Request) {
+	areas, err := fetchTrainingAreasWithTrainers()
+	if err != nil {
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	trainers, err := fetchTrainers()
+	if err != nil {
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	data := struct {
+		Areas    []TrainingArea
+		Trainers []Trainer
+	}{
+		Areas:    areas,
+		Trainers: trainers,
+	}
+
+	err = tmpl.ExecuteTemplate(w, "training_area_list.html", data)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+		return
+	}
+}
+
+func fetchTrainingAreasWithTrainers() ([]TrainingArea, error) {
+	rows, err := db.Query(`
+		SELECT ta.id, ta.name, t.id, t.name, t.email 
+		FROM training_areas ta
+		LEFT JOIN trainer_training_areas tta ON ta.id = tta.training_area_id
+		LEFT JOIN trainers t ON tta.trainer_id = t.id
+		ORDER BY ta.id, t.name`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	areaMap := make(map[int]*TrainingArea)
+
+	for rows.Next() {
+		var areaID int
+		var areaName string
+		var trainerID sql.NullInt64
+		var trainerName sql.NullString
+		var trainerEmail sql.NullString
+
+		err := rows.Scan(&areaID, &areaName, &trainerID, &trainerName, &trainerEmail)
+		if err != nil {
+			return nil, err
+		}
+
+		_, exists := areaMap[areaID]
+		if !exists {
+			area := &TrainingArea{ID: areaID, Name: areaName}
+			areaMap[areaID] = area
+		}
+
+		if trainerID.Valid {
+			areaMap[areaID].Trainers = append(areaMap[areaID].Trainers, Trainer{
+				ID:    int(trainerID.Int64),
+				Name:  trainerName.String,
+				Email: trainerEmail.String,
+			})
+		}
+	}
+
+	var areas []TrainingArea
+	for _, area := range areaMap {
+		areas = append(areas, *area)
+	}
+
+	return areas, nil
+}
+
+func assignTrainerToAreaHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method == http.MethodPost {
+		trainerID := r.FormValue("trainer_id")
+		areaID := r.FormValue("training_area_id")
+
+		if trainerID == "" || areaID == "" {
+			http.Error(w, "Trainer and Training Area are required", http.StatusBadRequest)
+			return
+		}
+
+		_, err := db.Exec("INSERT OR IGNORE INTO trainer_training_areas (trainer_id, training_area_id) VALUES (?, ?)", trainerID, areaID)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+
+		http.Redirect(w, r, "/training-areas", http.StatusSeeOther)
+	}
+}
+
+func addTrainingAreaHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method == http.MethodPost {
+		name := r.FormValue("name")
+		if name == "" {
+			http.Error(w, "Name is required", http.StatusBadRequest)
+			return
+		}
+
+		_, err := db.Exec("INSERT INTO training_areas (name) VALUES (?)", name)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+		http.Redirect(w, r, "/training-areas", http.StatusSeeOther)
+		return
+	}
+
+	err := tmpl.ExecuteTemplate(w, "add_training_area.html", nil)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+	}
+}
+
+func fetchTrainings() ([]Training, error) {
+	rows, err := db.Query("SELECT id, title, training_type, mode, start, end, status FROM trainings")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var trainings []Training
+	for rows.Next() {
+		var t Training
+		var start, end string
+		err := rows.Scan(&t.ID, &t.Title, &t.TrainingType, &t.Mode, &start, &end, &t.Status)
+		if err != nil {
+			return nil, err
+		}
+		t.Start, _ = time.Parse("2006-01-02 15:04:05", start)
+		t.End, _ = time.Parse("2006-01-02 15:04:05", end)
+		trainings = append(trainings, t)
+	}
+	return trainings, nil
+}
+
+func trainingListHandler(w http.ResponseWriter, r *http.Request) {
+	trainings, err := fetchTrainings()
+	if err != nil {
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	err = tmpl.ExecuteTemplate(w, "training_list.html", trainings)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+	}
+}
+
+func fetchTrainers() ([]Trainer, error) {
+	rows, err := db.Query("SELECT id, name, email FROM trainers")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var trainers []Trainer
+	for rows.Next() {
+		var t Trainer
+		err := rows.Scan(&t.ID, &t.Name, &t.Email)
+		if err != nil {
+			return nil, err
+		}
+		trainers = append(trainers, t)
+	}
+	return trainers, nil
+}
+
+func trainerListHandler(w http.ResponseWriter, r *http.Request) {
+	trainers, err := fetchTrainers()
+	if err != nil {
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	err = tmpl.ExecuteTemplate(w, "trainer_list.html", trainers)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+	}
+}
+
+func addTrainerHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method == http.MethodPost {
+		name := r.FormValue("name")
+		email := r.FormValue("email")
+		if name == "" || email == "" {
+			http.Error(w, "Name and Email are required", http.StatusBadRequest)
+			return
+		}
+
+		_, err := db.Exec("INSERT INTO trainers (name, email) VALUES (?, ?)", name, email)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+		http.Redirect(w, r, "/trainers", http.StatusSeeOther)
+		return
+	}
+
+	err := tmpl.ExecuteTemplate(w, "add_trainer.html", nil)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
+	}
+
+}
+
+func main() {
+	initDB()
+	initTemplates()
+	http.HandleFunc("/", homeHandler)
+	http.HandleFunc("/trainings", trainingListHandler)
+	http.HandleFunc("/trainers", trainerListHandler)
+	http.HandleFunc("/trainers/add", addTrainerHandler)
+	http.HandleFunc("/training-areas", trainingAreaListHandler)
+	http.HandleFunc("/training-areas/add", addTrainingAreaHandler)
+	http.HandleFunc("/training-areas/assign-trainer", assignTrainerToAreaHandler)
+
+	fmt.Println("Server running on http://localhost:8080")
+	http.ListenAndServe(":8080", nil)
+}

schema.sql

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+CREATE TABLE IF NOT EXISTS trainings (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title TEXT NOT NULL,
+    training_type TEXT NOT NULL,
+    mode TEXT NOT NULL,
+    start DATETIME NOT NULL,
+    end DATETIME NOT NULL,
+    status TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS trainers (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT NOT NULL,
+    email TEXT NOT NULL UNIQUE
+);
+
+CREATE TABLE IF NOT EXISTS training_trainers (
+    training_id INTEGER NOT NULL,
+    trainer_id INTEGER NOT NULL,
+    FOREIGN KEY (training_id) REFERENCES trainings(id),
+    FOREIGN KEY (trainer_id) REFERENCES trainers(id),
+    PRIMARY KEY (training_id, trainer_id)
+);
+
+CREATE TABLE IF NOT EXISTS training_areas (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS trainer_training_areas (
+    trainer_id INTEGER,
+    training_area_id INTEGER,
+    PRIMARY KEY (trainer_id, training_area_id),
+    FOREIGN KEY (trainer_id) REFERENCES trainers(id),
+    FOREIGN KEY (training_area_id) REFERENCES training_areas(id)
+);
+
+CREATE TABLE IF NOT EXISTS training_training_areas (
+    training_id INTEGER,
+    training_area_id INTEGER,
+    PRIMARY KEY (training_id, training_area_id),
+    FOREIGN KEY (training_id) REFERENCES trainings(id),
+    FOREIGN KEY (training_area_id) REFERENCES training_areas(id)
+);

templates/add_trainer.html

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+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+    <h1>Add Trainer</h1>
+    <a href="/">Back to Home</a>
+    <form action="/trainers/add" method="POST">
+        <label for="name">Name:</label>
+        <input type="text" id="name" name="name" required><br><br>
+        
+        <label for="email">Email:</label>
+        <input type="email" id="email" name="email" required><br><br>
+        
+        <button type="submit">Add Trainer</button>
+    </form>
+</body>
+</html>

templates/add_training_area.html

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+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+    <h1>Add New Training Area</h1>
+    <form action="/training-areas/add" method="post">
+        <label for="name">Training Area Name:</label>
+        <input type="text" id="name" name="name" required>
+        <button type="submit">Add</button>
+    </form>
+    <br>
+    <a href="/training-areas">Back to Training Areas</a>
+    <br><br>
+    <a href="/">Back to Home</a>
+</body>
+</html>

templates/css.html

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+<!-- css.html -->
+<style>
+    body {
+        font-family: Arial, sans-serif;
+        background-color: #f4f4f4;
+        margin: 0;
+        padding: 0;
+        color: #06041f;
+    }
+
+    /* Header settings */
+
+    header {
+        background-color: #06041f;
+        padding: 20px;
+        text-align: center;
+    }
+
+    header img {
+        width: 150px;
+        height: auto;
+    }
+
+    header h1 {
+        color: #47d7ac;
+    }
+
+    /* home */
+    .tiles ul {
+        list-style-type: none;
+        padding: 0;
+        display: flex;
+        flex-wrap: wrap;
+        justify-content: space-around;
+        margin: 20px 0;
+    }
+
+    .tiles li {
+        background-color: #ffffff;
+        border: 2px solid #47d7ac;
+        border-radius: 10px;
+        padding: 15px;
+        width: 180px;
+        text-align: center;
+        margin: 10px;
+        transition: transform 0.3s;
+    }
+
+    .tiles li:hover {
+        transform: scale(1.1);
+    }
+
+    .tiles a {
+        text-decoration: none;
+        color: #06041f;
+        font-size: 16px;
+        display: block;
+    }
+
+    .tiles .tile-icon {
+        font-size: 40px;
+        margin-bottom: 10px;
+    }
+
+    table {
+        width: 100%;
+        border-collapse: collapse;
+    }
+
+    th,
+    td {
+        border: 1px solid #ddd;
+        padding: 8px;
+        text-align: center;
+    }
+
+    th {
+        background-color: #47d7ac;
+    }
+
+    td {
+        background-color: #fff;
+    }
+
+    h1 {
+        color: #06041f;
+    }
+
+    button {
+        background-color: #47d7ac;
+        color: #fff;
+        padding: 8px 16px;
+        border: none;
+        cursor: pointer;
+        border-radius: 4px;
+    }
+
+    button:hover {
+        background-color: #35a895;
+    }
+</style>

templates/head.html

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+<!-- header.html -->
+<head>
+    <title>TMS - Nagarro Training Solutions</title>
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css" rel="stylesheet">
+    {{template "css.html" .}}
+</head>

templates/header.html

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+<header>
+    <img src="logo.png" alt="Training Management Logo"> 
+    <h1>Nagarro Training Solutions</h1>
+</header>

templates/home.html

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+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+<h1>Welcome to the Training Management System</h1>
+<div class="tiles">
+    <ul>
+        <li>
+            <div class="tile-icon"><i class="fas fa-chalkboard-teacher"></i></div> <!-- View Trainings icon -->
+            <a href="/trainings">View Trainings</a>
+        </li>
+        <li>
+            <div class="tile-icon"><i class="fas fa-users"></i></div> <!-- View Trainers icon -->
+            <a href="/trainers">View Trainers</a>
+        </li>
+        <li>
+            <div class="tile-icon"><i class="fas fa-user-plus"></i></div> <!-- Add Trainer icon -->
+            <a href="/trainers/add">Add Trainer</a>
+        </li>
+        <li>
+            <div class="tile-icon"><i class="fas fa-clipboard-list"></i></div> <!-- View Training Areas icon -->
+            <a href="/training-areas">View Training Areas</a>
+        </li>
+        <li>
+            <div class="tile-icon"><i class="fas fa-map-marker-alt"></i></div> <!-- Add Training Area icon -->
+            <a href="/training-areas/add">Add Training Area</a>
+        </li>
+    </ul>
+</div>
+</body>
+</html>

templates/trainer_list.html

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+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+
+    <h1>Trainers</h1>
+    <a href="/">Back to Home</a>
+    <a href="/trainers/add">Add Trainer</a>
+    <table border="1">
+        <tr>
+            <th>Name</th>
+            <th>Email</th>
+        </tr>
+        {{ range . }}
+        <tr>
+            <td>{{ .Name }}</td>
+            <td>{{ .Email }}</td>
+        </tr>
+        {{ end }}
+    </table>
+</body>
+</html>

templates/training_area_list.html

@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+
+<h1>Training Areas</h1>
+<a href="/training-areas/add">Add Training Area</a>
+
+<table>
+    <thead>
+        <tr>
+            <th>Training Area</th>
+            {{range $.Trainers}}
+            <th>{{.Name}}</th>
+            {{end}}
+        </tr>
+    </thead>
+    <tbody>
+        {{range $i, $currentArea := .Areas}}
+        <tr>
+            <td>{{.Name}}</td>
+            {{range $.Trainers}}
+            <td>
+                <form action="/training-areas/assign-trainer" method="post" style="display:inline;">
+                    <input type="hidden" name="training_area_id" value="{{$currentArea.ID}}">
+                    <input type="hidden" name="trainer_id" value="{{.ID}}">
+                    <input type="checkbox" name="assigned" value="true" {{if $currentArea.IsTrainerAssigned .ID}}checked{{end}} onchange="this.form.submit()">
+                </form>
+            </td>
+            {{end}}
+        </tr>
+        {{end}}
+    </tbody>
+</table>
+
+<a href="/">Back to Home</a>
+
+</body>
+</html>

templates/training_list.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+{{template "head.html" .}} <!-- Include header template -->
+
+<body>
+{{template "header.html" .}}
+    <h1>Trainings</h1>
+    <a href="/">Back to Home</a>
+    <table border="1">
+        <tr>
+            <th>Title</th>
+            <th>Type</th>
+            <th>Mode</th>
+            <th>Start</th>
+            <th>End</th>
+            <th>Status</th>
+        </tr>
+        {{ range . }}
+        <tr>
+            <td>{{ .Title }}</td>
+            <td>{{ .TrainingType }}</td>
+            <td>{{ .Mode }}</td>
+            <td>{{ .Start }}</td>
+            <td>{{ .End }}</td>
+            <td>{{ .Status }}</td>
+        </tr>
+        {{ end }}
+    </table>
+</body>
+</html>