{% extends "base.html" %}
{% load static %}

{% block title %}Change Password{% endblock %}

{% block content %}
<div class="d-flex align-items-center mb-3">
    <div>
        <ol class="breadcrumb">
            <li class="breadcrumb-item"><a href="{% url 'core:dashboard' %}">Dashboard</a></li>
            <li class="breadcrumb-item"><a href="{% url 'accounts:user_profile' %}">Profile</a></li>
            <li class="breadcrumb-item active">Change Password</li>
        </ol>
        <h1 class="page-header mb-0">Change Password</h1>
    </div>
</div>

<div class="row justify-content-center">
    <div class="col-xl-6 col-lg-8">
        <div class="card">
            <div class="card-header">
                <h4 class="card-title">
                    <i class="fas fa-key me-2"></i>
                    Change Your Password
                </h4>
            </div>
            <div class="card-body">
                {% if messages %}
                    {% for message in messages %}
                        <div class="alert alert-{{ message.tags }} alert-dismissible fade show" role="alert">
                            {{ message }}
                            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                        </div>
                    {% endfor %}
                {% endif %}

                {% if form.non_field_errors %}
                    <div class="alert alert-danger">
                        {{ form.non_field_errors }}
                    </div>
                {% endif %}

                <div class="alert alert-info">
                    <i class="fas fa-info-circle me-2"></i>
                    For security reasons, please enter your current password to confirm your identity.
                </div>

                <form method="post" novalidate>
                    {% csrf_token %}
                    
                    <div class="mb-3">
                        <label for="id_old_password" class="form-label">Current Password</label>
                        <div class="input-group">
                            <span class="input-group-text">
                                <i class="fas fa-lock"></i>
                            </span>
                            <input type="password" 
                                   class="form-control {% if form.old_password.errors %}is-invalid{% endif %}" 
                                   id="id_old_password" 
                                   name="old_password" 
                                   placeholder="Enter your current password"
                                   required>
                            <button type="button" class="btn btn-outline-secondary" onclick="togglePassword('id_old_password')">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                        {% if form.old_password.errors %}
                            <div class="invalid-feedback d-block">
                                {{ form.old_password.errors.0 }}
                            </div>
                        {% endif %}
                    </div>

                    <div class="mb-3">
                        <label for="id_new_password1" class="form-label">New Password</label>
                        <div class="input-group">
                            <span class="input-group-text">
                                <i class="fas fa-key"></i>
                            </span>
                            <input type="password" 
                                   class="form-control {% if form.new_password1.errors %}is-invalid{% endif %}" 
                                   id="id_new_password1" 
                                   name="new_password1" 
                                   placeholder="Enter your new password"
                                   required>
                            <button type="button" class="btn btn-outline-secondary" onclick="togglePassword('id_new_password1')">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                        {% if form.new_password1.errors %}
                            <div class="invalid-feedback d-block">
                                {{ form.new_password1.errors.0 }}
                            </div>
                        {% endif %}
                        
                        <!-- Password Requirements -->
                        <div class="mt-2">
                            <small class="text-muted">Password requirements:</small>
                            <div id="password-requirements" class="mt-1">
                                <div class="requirement small" id="req-length">
                                    <i class="fas fa-times text-danger me-1"></i>At least 8 characters
                                </div>
                                <div class="requirement small" id="req-uppercase">
                                    <i class="fas fa-times text-danger me-1"></i>One uppercase letter
                                </div>
                                <div class="requirement small" id="req-lowercase">
                                    <i class="fas fa-times text-danger me-1"></i>One lowercase letter
                                </div>
                                <div class="requirement small" id="req-number">
                                    <i class="fas fa-times text-danger me-1"></i>One number
                                </div>
                            </div>
                        </div>
                    </div>

                    <div class="mb-3">
                        <label for="id_new_password2" class="form-label">Confirm New Password</label>
                        <div class="input-group">
                            <span class="input-group-text">
                                <i class="fas fa-key"></i>
                            </span>
                            <input type="password" 
                                   class="form-control {% if form.new_password2.errors %}is-invalid{% endif %}" 
                                   id="id_new_password2" 
                                   name="new_password2" 
                                   placeholder="Confirm your new password"
                                   required>
                            <button type="button" class="btn btn-outline-secondary" onclick="togglePassword('id_new_password2')">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                        {% if form.new_password2.errors %}
                            <div class="invalid-feedback d-block">
                                {{ form.new_password2.errors.0 }}
                            </div>
                        {% endif %}
                        <div id="password-match" class="mt-1"></div>
                    </div>

                    <div class="alert alert-warning">
                        <i class="fas fa-exclamation-triangle me-2"></i>
                        <strong>Important:</strong> After changing your password, you will be logged out of all devices and need to sign in again.
                    </div>

                    <div class="d-flex justify-content-between">
                        <a href="{% url 'accounts:user_profile' %}" class="btn btn-secondary">
                            <i class="fas fa-arrow-left me-2"></i>Cancel
                        </a>
                        <button type="submit" class="btn btn-primary" id="changePasswordBtn">
                            <i class="fas fa-save me-2"></i>Change Password
                        </button>
                    </div>
                </form>
            </div>
        </div>

        <!-- Security Tips -->
        <div class="card mt-4">
            <div class="card-header">
                <h5 class="card-title">
                    <i class="fas fa-shield-alt me-2"></i>
                    Security Tips
                </h5>
            </div>
            <div class="card-body">
                <ul class="list-unstyled mb-0">
                    <li class="mb-2">
                        <i class="fas fa-check text-success me-2"></i>
                        Use a unique password that you don't use elsewhere
                    </li>
                    <li class="mb-2">
                        <i class="fas fa-check text-success me-2"></i>
                        Include a mix of letters, numbers, and special characters
                    </li>
                    <li class="mb-2">
                        <i class="fas fa-check text-success me-2"></i>
                        Avoid using personal information in your password
                    </li>
                    <li class="mb-2">
                        <i class="fas fa-check text-success me-2"></i>
                        Consider using a password manager
                    </li>
                    <li>
                        <i class="fas fa-check text-success me-2"></i>
                        Change your password regularly
                    </li>
                </ul>
            </div>
        </div>
    </div>
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const newPassword1 = document.getElementById('id_new_password1');
    const newPassword2 = document.getElementById('id_new_password2');
    const changePasswordBtn = document.getElementById('changePasswordBtn');
    
    // Password validation
    function validatePassword() {
        const password = newPassword1.value;
        const requirements = {
            'req-length': password.length >= 8,
            'req-uppercase': /[A-Z]/.test(password),
            'req-lowercase': /[a-z]/.test(password),
            'req-number': /\d/.test(password)
        };
        
        let allValid = true;
        Object.keys(requirements).forEach(req => {
            const element = document.getElementById(req);
            const icon = element.querySelector('i');
            
            if (requirements[req]) {
                icon.className = 'fas fa-check text-success me-1';
            } else {
                icon.className = 'fas fa-times text-danger me-1';
                allValid = false;
            }
        });
        
        return allValid;
    }
    
    function checkPasswordMatch() {
        const matchDiv = document.getElementById('password-match');
        
        if (newPassword2.value === '') {
            matchDiv.innerHTML = '';
            return false;
        }
        
        if (newPassword1.value === newPassword2.value) {
            matchDiv.innerHTML = '<small class="text-success"><i class="fas fa-check me-1"></i>Passwords match</small>';
            return true;
        } else {
            matchDiv.innerHTML = '<small class="text-danger"><i class="fas fa-times me-1"></i>Passwords do not match</small>';
            return false;
        }
    }
    
    function updateSubmitButton() {
        const passwordValid = validatePassword();
        const passwordsMatch = checkPasswordMatch();
        const oldPasswordFilled = document.getElementById('id_old_password').value !== '';
        
        changePasswordBtn.disabled = !(passwordValid && passwordsMatch && oldPasswordFilled);
    }
    
    newPassword1.addEventListener('input', function() {
        validatePassword();
        checkPasswordMatch();
        updateSubmitButton();
    });
    
    newPassword2.addEventListener('input', function() {
        checkPasswordMatch();
        updateSubmitButton();
    });
    
    document.getElementById('id_old_password').addEventListener('input', updateSubmitButton);
    
    // Form submission
    const form = document.querySelector('form');
    form.addEventListener('submit', function() {
        changePasswordBtn.disabled = true;
        changePasswordBtn.innerHTML = '<i class="fas fa-spinner fa-spin me-2"></i>Changing Password...';
    });
});

function togglePassword(inputId) {
    const input = document.getElementById(inputId);
    const button = input.nextElementSibling;
    const icon = button.querySelector('i');
    
    if (input.type === 'password') {
        input.type = 'text';
        icon.className = 'fas fa-eye-slash';
    } else {
        input.type = 'password';
        icon.className = 'fas fa-eye';
    }
}
</script>
{% endblock %}