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from flask import Flask, render_template_string, request, redirect, url_for, session
import os
import platform

app = Flask(__name__)
app.secret_key = "mini_os_secret_key"

# ---------------- LOGIN PAGE ---------------- #
login_page = """
<!DOCTYPE html>
<html>
<head>
    <title>Mini OS Login</title>
    <style>
        body { background:black; color:white; text-align:center; font-family:Arial; }
        .box { margin-top:100px; }
        input { padding:10px; margin:5px; width:200px; }
        button { padding:10px 20px; background:green; color:white; border:none; cursor:pointer; }
    </style>
</head>
<body>
    <div class="box">
        <h1>Mini Python OS</h1>

        <form method="POST">
            <input name="username" placeholder="Username" required><br>
            <input name="password" type="password" placeholder="Password" required><br>
            <button type="submit">Login</button>
        </form>

        <p>Default Login: admin / 1234</p>
        <p style="color:red;">{{error}}</p>
    </div>
</body>
</html>
"""

# ---------------- DASHBOARD ---------------- #
dashboard_page = """
<!DOCTYPE html>
<html>
<head>
    <title>Mini OS Desktop</title>
    <style>
        body { background:#1e1e1e; color:white; font-family:Arial; text-align:center; }
        button { padding:15px; margin:10px; width:220px; cursor:pointer; }
        .container { margin-top:50px; }
    </style>
</head>
<body>
    <h1>Mini Python OS Desktop</h1>

    <div class="container">
        <a href="/files"><button>File Explorer</button></a>
        <a href="/notepad"><button>Notepad</button></a>
        <a href="/calculator"><button>Calculator</button></a>
        <a href="/system"><button>System Info</button></a>

        <a href="https://google.com" target="_blank"><button>Open Google</button></a>
        <a href="https://chat.openai.com" target="_blank"><button>Open ChatGPT</button></a>

        <br><br>
        <a href="/logout"><button style="background:red;color:white;">Logout</button></a>
    </div>
</body>
</html>
"""

# ---------------- FILE EXPLORER ---------------- #
files_page = """
<h2>File Explorer</h2>
<ul>
{% for f in files %}
<li>{{f}}</li>
{% endfor %}
</ul>
<br>
<a href="/dashboard">Back</a>
"""

# ---------------- NOTEPAD ---------------- #
notepad_page = """
<h2>Notepad</h2>

<form method="POST">
<textarea name="text" rows="15" cols="60"></textarea><br><br>
<button type="submit">Save</button>
</form>

<p style="color:lightgreen;">{{msg}}</p>
<br>
<a href="/dashboard">Back</a>
"""

# ---------------- CALCULATOR ---------------- #
calculator_page = """
<h2>Calculator</h2>

<form method="POST">
<input name="exp" placeholder="Enter expression" required>
<button type="submit">Calculate</button>
</form>

<h3>Result: {{result}}</h3>
<br>
<a href="/dashboard">Back</a>
"""

# ---------------- SYSTEM INFO ---------------- #
system_page = """
<h2>System Info</h2>
<pre>
System: {{system}}
Node: {{node}}
Release: {{release}}
Version: {{version}}
Machine: {{machine}}
Processor: {{processor}}
</pre>

<br>
<a href="/dashboard">Back</a>
"""

# ---------------- ROUTES ---------------- #

@app.route("/", methods=["GET", "POST"])
def login():
    error = ""

    if request.method == "POST":
        username = request.form.get("username")
        password = request.form.get("password")

        if username == "admin" and password == "1234":
            session["user"] = username
            return redirect(url_for("dashboard"))   # FIXED REDIRECT
        else:
            error = "Invalid username or password"

    return render_template_string(login_page, error=error)


@app.route("/dashboard")
def dashboard():
    if "user" not in session:
        return redirect(url_for("login"))
    return render_template_string(dashboard_page)


@app.route("/files")
def files():
    if "user" not in session:
        return redirect(url_for("login"))

    file_list = os.listdir(".")
    return render_template_string(files_page, files=file_list)


@app.route("/notepad", methods=["GET", "POST"])
def notepad():
    if "user" not in session:
        return redirect(url_for("login"))

    msg = ""
    if request.method == "POST":
        text = request.form.get("text")
        with open("note.txt", "w", encoding="utf-8") as f:
            f.write(text)
        msg = "File saved as note.txt"

    return render_template_string(notepad_page, msg=msg)


@app.route("/calculator", methods=["GET", "POST"])
def calculator():
    if "user" not in session:
        return redirect(url_for("login"))

    result = ""
    if request.method == "POST":
        try:
            exp = request.form.get("exp")
            result = eval(exp)
        except:
            result = "Error"

    return render_template_string(calculator_page, result=result)


@app.route("/system")
def system():
    if "user" not in session:
        return redirect(url_for("login"))

    return render_template_string(system_page,
        system=platform.system(),
        node=platform.node(),
        release=platform.release(),
        version=platform.version(),
        machine=platform.machine(),
        processor=platform.processor()
    )


@app.route("/logout")
def logout():
    session.clear()
    return redirect(url_for("login"))


# ---------------- RUN APP ---------------- #
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=7860, debug=True)