# app.py
from flask import Flask, render_template, request, redirect, url_for, session, jsonify
import os
import subprocess
import threading
import uuid
import time

from config import (
    MAIN_SERVER_IP, RUNNING_ON_MAIN_SERVER,
    VM_HOST, VM_PORT, VM_KEY, VM_USER,
    MAIN_SERVER_KEY, MAIN_SERVER_PORT, MAIN_SERVER_USER,
)
from modules.auth import login_required
from modules.backups import (
    get_containers, get_all_root_containers,
    get_local_backups, get_vm_backups,
    get_all_stats, get_system_info,
    get_rootless_user_containers_remote,
    container_action, get_container_status,
    audit_backup, delete_backup,
    get_backup_log_entries, get_backup_script_path,
)
from modules.commands import run_command
from modules.users import (
    get_all_users, get_user_containers, get_all_users_containers,
    create_user, delete_user, get_user_disk_usage,
)

app = Flask(__name__)
app.secret_key = 'navitrends-secret-key-2025'

# Increase default timeout for slow VM→main-server SSH calls
app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0

restore_jobs = {}
backup_jobs  = {}


def _stream_restore(job_id, cmd):
    restore_jobs[job_id] = {'status': 'running', 'log': [], 'started': time.time()}
    try:
        proc = subprocess.Popen(
            cmd, shell=True,
            stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
            text=True, bufsize=1
        )
        for line in proc.stdout:
            restore_jobs[job_id]['log'].append(line.rstrip())
        proc.wait()
        restore_jobs[job_id]['status'] = 'done' if proc.returncode == 0 else 'error'
        restore_jobs[job_id]['returncode'] = proc.returncode
    except Exception as e:
        restore_jobs[job_id]['log'].append(f"ERROR: {e}")
        restore_jobs[job_id]['status'] = 'error'


def _stream_backup(job_id, script_path):
    backup_jobs[job_id] = {'status': 'running', 'log': [], 'started': time.time()}
    try:
        proc = subprocess.Popen(
            ['bash', script_path],
            stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
            text=True, bufsize=1
        )
        for line in proc.stdout:
            backup_jobs[job_id]['log'].append(line.rstrip())
        proc.wait()
        backup_jobs[job_id]['status'] = 'done' if proc.returncode == 0 else 'error'
        backup_jobs[job_id]['returncode'] = proc.returncode
    except Exception as e:
        backup_jobs[job_id]['log'].append(f"ERROR: {e}")
        backup_jobs[job_id]['status'] = 'error'


# ─────────────────────────────────────────────
# DASHBOARD
# Loads instantly — all heavy data fetched async via JS after page renders
# ─────────────────────────────────────────────
@app.route('/')
@login_required
def dashboard():
    # On the VM: skip slow SSH calls at page load — JS fetches them async via /api/dashboard
    # On the main server: fetch everything normally (local calls, no SSH delay)
    backups    = get_local_backups()
    vm_backups = get_vm_backups()

    if RUNNING_ON_MAIN_SERVER:
        containers    = get_containers()
        running_count = sum(1 for c in containers if 'Up' in c.get('status', ''))
        system        = get_system_info()
        users         = get_all_users()
    else:
        containers    = []      # loaded async by JS via /api/dashboard
        running_count = 0
        system        = {}
        users         = []

    return render_template('pages/dashboard.html',
                           containers=containers,
                           running_count=running_count,
                           backups=backups,
                           vm_backups=vm_backups,
                           main_server=MAIN_SERVER_IP,
                           system=system,
                           users=users,
                           running_on_main=RUNNING_ON_MAIN_SERVER,
                           active_page='dashboard',
                           page_title='Dashboard',
                           page_subtitle=MAIN_SERVER_IP)


@app.route('/containers')
@login_required
def containers_page():
    return render_template(
        'pages/containers.html',
        main_server=MAIN_SERVER_IP,
        active_page='containers',
        page_title='All Containers',
        page_subtitle='main server · all users'
    )


@app.route('/backups')
@login_required
def backups_page():
    return render_template(
        'pages/backups.html',
        backups=get_local_backups(),
        vm_backups=get_vm_backups(),
        main_server=MAIN_SERVER_IP,
        active_page='backups',
        page_title='Backup Management',
        page_subtitle='local & VM'
    )


@app.route('/restore')
@login_required
def restore_page():
    prefill = {
        'source': request.args.get('source', '').strip(),
        'file': request.args.get('file', '').strip(),
    }
    return render_template(
        'pages/restore.html',
        backups=get_local_backups(),
        vm_backups=get_vm_backups(),
        restore_prefill=prefill,
        main_server=MAIN_SERVER_IP,
        active_page='restore',
        page_title='Restore',
        page_subtitle='backup → target'
    )


@app.route('/users')
@login_required
def users_page():
    # On VM: skip slow SSH call — JS loads users async via /api/users
    # On main server: fetch normally (local, fast)
    users = get_all_users() if RUNNING_ON_MAIN_SERVER else []
    return render_template(
        'pages/users.html',
        users=users,
        main_server=MAIN_SERVER_IP,
        active_page='users',
        page_title='User Management',
        page_subtitle='linux + docker'
    )


@app.route('/settings')
@login_required
def settings_page():
    # On VM: skip slow SSH call — JS loads system info async via /api/system
    # On main server: fetch normally (local, fast)
    system = get_system_info() if RUNNING_ON_MAIN_SERVER else {}
    return render_template(
        'pages/settings.html',
        main_server=MAIN_SERVER_IP,
        system=system,
        running_on_main=RUNNING_ON_MAIN_SERVER,
        active_page='settings',
        page_title='Settings',
        page_subtitle='platform config'
    )


# ─────────────────────────────────────────────
# API — system + stats (always from main server)
# ─────────────────────────────────────────────
@app.route('/api/system')
@login_required
def api_system():
    return jsonify(get_system_info())


@app.route('/api/stats')
@login_required
def api_stats():
    return jsonify(get_all_stats())


@app.route('/api/containers')
@login_required
def api_containers():
    containers    = get_all_root_containers()
    running_count = sum(1 for c in containers if 'Up' in c.get('status', ''))
    return jsonify({'containers': containers, 'running': running_count})


@app.route('/api/containers/all')
@login_required
def api_containers_all():
    """Root containers + rootless-user containers, all from main server."""
    root_ctrs = get_all_root_containers()
    user_ctrs = get_rootless_user_containers_remote()
    all_ctrs  = root_ctrs + user_ctrs
    running   = sum(1 for c in all_ctrs if 'Up' in c.get('status', ''))
    return jsonify({'containers': all_ctrs, 'running': running})


@app.route('/api/nav-summary')
@login_required
def api_nav_summary():
    """Lightweight counts for sidebar badges (one round trip)."""
    root_ctrs = get_all_root_containers()
    user_ctrs = get_rootless_user_containers_remote()
    all_ctrs  = root_ctrs + user_ctrs
    users     = get_all_users()
    return jsonify({
        'container_count': len(all_ctrs),
        'user_count':      len(users),
    })


# ─────────────────────────────────────────────
# API — dashboard summary (fast async load)
# ─────────────────────────────────────────────
@app.route('/api/dashboard')
@login_required
def api_dashboard():
    """
    Single endpoint the dashboard JS calls after page render.
    Returns system info + container summary + user count in one shot.
    """
    system    = get_system_info()
    root_ctrs = get_all_root_containers()
    user_ctrs = get_rootless_user_containers_remote()
    all_ctrs  = root_ctrs + user_ctrs
    users     = get_all_users()
    running   = sum(1 for c in all_ctrs if 'Up' in c.get('status', ''))

    return jsonify({
        'system':          system,
        'containers':      all_ctrs,
        'running_count':   running,
        'user_count':      len(users),
        'local_backups':   len(get_local_backups()),
        'vm_backups':      len(get_vm_backups()),
    })


# ─────────────────────────────────────────────
# API — container actions
# ─────────────────────────────────────────────
@app.route('/api/container/action', methods=['POST'])
@login_required
def api_container_action():
    data   = request.get_json() or {}
    name   = data.get('name', '').strip()
    action = data.get('action', '').strip()

    if not name or not action:
        return jsonify({'success': False, 'message': 'name and action required'}), 400

    success, output = container_action(name, action)
    time.sleep(1.5)
    status_info = get_container_status(name)

    return jsonify({
        'success':        success,
        'output':         output,
        'new_status':     status_info['status'],
        'new_status_raw': status_info['raw'],
    })


@app.route('/api/container/status/<name>')
@login_required
def api_container_status(name):
    status_info = get_container_status(name)
    return jsonify(status_info)


# ─────────────────────────────────────────────
# API — backups
# ─────────────────────────────────────────────
@app.route('/api/backups')
@login_required
def api_backups():
    return jsonify({'local': get_local_backups(), 'vm': get_vm_backups()})


@app.route('/api/backups/log')
@login_required
def api_backup_log():
    limit = int(request.args.get('limit', 20))
    entries = get_backup_log_entries(limit)
    return jsonify({'entries': entries})


@app.route('/api/backups/audit', methods=['POST'])
@login_required
def api_backup_audit():
    data   = request.get_json() or {}
    bfile  = data.get('backup_file', '').strip()
    source = data.get('source', 'local').strip()

    if not bfile:
        return jsonify({'error': 'backup_file required'}), 400

    result = audit_backup(bfile, source)
    return jsonify(result)


@app.route('/api/backups/delete', methods=['POST'])
@login_required
def api_backup_delete():
    data   = request.get_json() or {}
    bfile  = data.get('backup_file', '').strip()
    source = data.get('source', 'local').strip()

    if not bfile:
        return jsonify({'success': False, 'message': 'backup_file required'}), 400

    success, message = delete_backup(bfile, source)
    return jsonify({'success': success, 'message': message})


@app.route('/api/backups/run', methods=['POST'])
@login_required
def api_backup_run():
    if not RUNNING_ON_MAIN_SERVER:
        return jsonify({
            'success': False,
            'message': 'Manual backup can only be triggered from the main server platform.'
        }), 400

    script = '/root/backup-myapps.sh'
    if not os.path.exists(script):
        return jsonify({
            'success': False,
            'message': f'Backup script not found at {script}'
        }), 500

    job_id = str(uuid.uuid4())
    t = threading.Thread(target=_stream_backup, args=(job_id, script), daemon=True)
    t.start()
    return jsonify({'success': True, 'job_id': job_id, 'status': 'started'})


@app.route('/api/backups/run/status/<job_id>')
@login_required
def api_backup_run_status(job_id):
    job = backup_jobs.get(job_id)
    if not job:
        return jsonify({'error': 'Job not found'}), 404
    return jsonify({
        'status':  job['status'],
        'log':     job['log'],
        'elapsed': round(time.time() - job.get('started', time.time()))
    })


# ─────────────────────────────────────────────
# API — users
# ─────────────────────────────────────────────
@app.route('/api/users')
@login_required
def api_users():
    return jsonify(get_all_users())


@app.route('/api/users/<username>/containers')
@login_required
def api_user_containers(username):
    return jsonify(get_user_containers(username))


@app.route('/api/users/<username>/disk')
@login_required
def api_user_disk(username):
    return jsonify(get_user_disk_usage(username))


@app.route('/api/users/create', methods=['POST'])
@login_required
def api_create_user():
    data          = request.get_json() or {}
    username      = data.get('username', '').strip()
    password      = data.get('password', '').strip()
    setup_docker  = data.get('setup_docker', True)
    disk_quota_mb = data.get('disk_quota_mb')

    if not username:
        return jsonify({'success': False, 'message': 'Username required'}), 400

    success, message = create_user(
        username=username,
        password=password or None,
        setup_docker=setup_docker,
        disk_quota_mb=disk_quota_mb,
    )
    return jsonify({'success': success, 'message': message})


@app.route('/api/users/delete', methods=['POST'])
@login_required
def api_delete_user():
    data        = request.get_json() or {}
    username    = data.get('username', '').strip()
    remove_home = data.get('remove_home', False)

    if not username:
        return jsonify({'success': False, 'message': 'Username required'}), 400

    success, message = delete_user(username, remove_home=remove_home)
    return jsonify({'success': success, 'message': message})


# ─────────────────────────────────────────────
# RESTORE
# ─────────────────────────────────────────────
@app.route('/restore/start', methods=['POST'])
@login_required
def restore_start():
    data = request.get_json()
    if not data:
        return jsonify({'error': 'No JSON body'}), 400

    backup_source = data.get('backup_source', 'local')
    backup_file   = data.get('backup_file', '').strip()
    target        = data.get('target', 'local')
    remote_ip     = data.get('remote_ip', '').strip()
    remote_port   = str(data.get('remote_port', '22')).strip() or '22'
    remote_user   = data.get('remote_user', 'root').strip() or 'root'
    auth_method   = data.get('auth_method', 'key')
    ssh_key_path  = data.get('ssh_key_path', VM_KEY).strip()
    ssh_password  = data.get('ssh_password', '').strip()

    if not backup_file:
        return jsonify({'error': 'No backup file specified'}), 400

    if backup_source == 'local':
        if RUNNING_ON_MAIN_SERVER:
            backup_path = f"/root/backups/{backup_file}"
            if not os.path.exists(backup_path):
                return jsonify({'error': f'Not found: {backup_path}'}), 400
        else:
            backup_path = f"/tmp/{backup_file}"
            if not os.path.exists(backup_path):
                pull_cmd = (
                    f"scp -i {MAIN_SERVER_KEY} -P {MAIN_SERVER_PORT} "
                    f"-o StrictHostKeyChecking=no -o ConnectTimeout=15 "
                    f"{MAIN_SERVER_USER}@{MAIN_SERVER_IP}:/root/backups/{backup_file} "
                    f"{backup_path}"
                )
                res = subprocess.run(pull_cmd, shell=True, capture_output=True, text=True)
                if res.returncode != 0:
                    return jsonify({'error': f'Failed to pull from main server: {res.stderr}'}), 500
    else:
        if RUNNING_ON_MAIN_SERVER:
            backup_path = f"/tmp/{backup_file}"
            if not os.path.exists(backup_path):
                pull_cmd = (
                    f"scp -i {VM_KEY} -P {VM_PORT} "
                    f"-o StrictHostKeyChecking=no -o ConnectTimeout=15 "
                    f"{VM_USER}@{VM_HOST}:/backups/main-server/{backup_file} "
                    f"{backup_path}"
                )
                res = subprocess.run(pull_cmd, shell=True, capture_output=True, text=True)
                if res.returncode != 0:
                    return jsonify({'error': f'Failed to pull from VM: {res.stderr}'}), 500
        else:
            backup_path = f"/backups/main-server/{backup_file}"
            if not os.path.exists(backup_path):
                return jsonify({'error': f'Not found: {backup_path}'}), 400

    restore_script_local = os.path.join(
        os.path.dirname(os.path.abspath(__file__)), 'restore-myapps.sh'
    )
    if not os.path.exists(restore_script_local):
        return jsonify({'error': f'restore-myapps.sh not found at {restore_script_local}'}), 500

    if target == 'local':
        hostname = os.uname().nodename
        session_dir = f"/tmp/restore-session-{uuid.uuid4().hex[:8]}"
        cmd = (
            f"set -e && "
            f"echo '🖥️  Restoring on this server ({hostname})...' && "
            f"mkdir -p {session_dir} && "
            f"echo '📂 Extracting backup...' && "
            f"tar -xzf {backup_path} -C {session_dir} --strip-components=1 && "
            f"cp {restore_script_local} {session_dir}/restore-myapps.sh && "
            f"chmod +x {session_dir}/restore-myapps.sh && "
            f"cd {session_dir} && bash restore-myapps.sh ; "
            f"EXIT=$? ; rm -rf {session_dir} ; exit $EXIT"
        )
    else:
        if not remote_ip:
            return jsonify({'error': 'remote_ip required'}), 400

        base_opts = "-o StrictHostKeyChecking=no -o ConnectTimeout=15"
        if auth_method == 'key':
            if not ssh_key_path:
                return jsonify({'error': 'ssh_key_path required'}), 400
            ssh_prefix = f"ssh -p {remote_port} -i {ssh_key_path} {base_opts}"
            scp_prefix = f"scp -P {remote_port} -i {ssh_key_path} {base_opts}"
        else:
            if not ssh_password:
                return jsonify({'error': 'ssh_password required'}), 400
            ssh_prefix = f"sshpass -p '{ssh_password}' ssh -p {remote_port} {base_opts}"
            scp_prefix = f"sshpass -p '{ssh_password}' scp -P {remote_port} {base_opts}"

        remote_dest = f"/backups/restore-session-{uuid.uuid4().hex[:8]}"
        cmd = (
            f"echo '🔗 Connecting to {remote_user}@{remote_ip}:{remote_port}...' && "
            f"{ssh_prefix} {remote_user}@{remote_ip} 'mkdir -p {remote_dest}' && "
            f"echo '✅ Connected.' && "
            f"echo '📤 Copying backup archive...' && "
            f"{scp_prefix} {backup_path} {remote_user}@{remote_ip}:{remote_dest}/{backup_file} && "
            f"echo '📤 Copying restore script...' && "
            f"{scp_prefix} {restore_script_local} {remote_user}@{remote_ip}:{remote_dest}/restore-myapps.sh && "
            f"echo '🚀 Running restore on {remote_ip}:{remote_port}...' && "
            f"{ssh_prefix} {remote_user}@{remote_ip} "
            f"'set -e && cd {remote_dest} && "
            f"tar -xzf {backup_file} --strip-components=1 && "
            f"chmod +x restore-myapps.sh && bash restore-myapps.sh' ; "
            f"EXIT=$? ; "
            f"{ssh_prefix} {remote_user}@{remote_ip} 'rm -rf {remote_dest}' 2>/dev/null ; "
            f"exit $EXIT"
        )

    job_id = str(uuid.uuid4())
    t = threading.Thread(target=_stream_restore, args=(job_id, cmd), daemon=True)
    t.start()
    return jsonify({'job_id': job_id, 'status': 'started'})


@app.route('/restore/status/<job_id>')
@login_required
def restore_status_poll(job_id):
    job = restore_jobs.get(job_id)
    if not job:
        return jsonify({'error': 'Job not found'}), 404
    return jsonify({
        'status':  job['status'],
        'log':     job['log'],
        'elapsed': round(time.time() - job.get('started', time.time()))
    })


# ─────────────────────────────────────────────
# SERVER STATUS
# ─────────────────────────────────────────────
@app.route('/server/status')
@login_required
def server_status():
    stdout, stderr = run_command("uptime")
    if stderr or not stdout:
        return jsonify({'status': 'offline', 'error': stderr or 'Failed'})
    return jsonify({'status': 'online', 'info': stdout.strip()})


# ─────────────────────────────────────────────
# AUTH
# ─────────────────────────────────────────────
@app.route('/login', methods=['GET', 'POST'])
def login():
    error = ''
    if request.method == 'POST':
        if request.form.get('password') == 'admin123':
            session['logged_in'] = True
            return redirect(url_for('dashboard'))
        error = 'Wrong password'
    return render_template('login.html', error=error)


@app.route('/logout')
def logout():
    session.pop('logged_in', None)
    return redirect(url_for('login'))


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=False)