import os
import glob
import subprocess
import json
from config import RUNNING_ON_MAIN_SERVER, VM_HOST, VM_PORT, VM_KEY, VM_USER


def _run(cmd, timeout=20):
    try:
        r = subprocess.run(cmd, shell=True, capture_output=True, text=True, timeout=timeout)
        return r.stdout.strip(), r.stderr.strip()
    except Exception as e:
        return '', str(e)


# ────────────────────────────────────────────────────────────────
# BACKUPS
# ────────────────────────────────────────────────────────────────

def get_local_backups():
    stdout, _ = _run("ls -t /root/backups/myapps-backup-*.tar.gz 2>/dev/null | head -20")
    files = []
    if stdout:
        for line in stdout.split('\n'):
            line = line.strip()
            if line:
                files.append(os.path.basename(line))
    return files


def get_vm_backups():
    vm_backups = []
    if RUNNING_ON_MAIN_SERVER:
        try:
            cmd = (
                f"ssh -i {VM_KEY} -p {VM_PORT} "
                f"-o StrictHostKeyChecking=no -o ConnectTimeout=10 "
                f"{VM_USER}@{VM_HOST} "
                f"'ls -t /backups/main-server/myapps-backup-*.tar.gz 2>/dev/null | head -20'"
            )
            stdout, _ = _run(cmd, timeout=20)
            if stdout:
                for line in stdout.split('\n'):
                    line = line.strip()
                    if line and '.tar.gz' in line:
                        vm_backups.append(os.path.basename(line))
        except Exception as e:
            print(f"[backups] VM backup fetch error: {e}")
    else:
        backup_dir = '/backups/main-server'
        if os.path.exists(backup_dir):
            files = glob.glob(f'{backup_dir}/myapps-backup-*.tar.gz')
            files.sort(key=os.path.getmtime, reverse=True)
            vm_backups = [os.path.basename(f) for f in files[:20]]
    return vm_backups


# ────────────────────────────────────────────────────────────────
# ROOT CONTAINERS
# ────────────────────────────────────────────────────────────────

def get_containers():
    """Root app containers only (filtered)."""
    stdout, _ = _run(
        "docker ps -a --format '{{.Names}}|{{.Status}}|{{.Image}}|{{.Ports}}' 2>/dev/null | "
        "grep -E 'frappe|nextcloud|mautic|n8n|odoo'"
    )
    containers = []
    if stdout:
        for line in stdout.split('\n'):
            if '|' not in line:
                continue
            parts = line.split('|')
            containers.append({
                'name':   parts[0].strip(),
                'status': parts[1].strip(),
                'image':  parts[2].strip(),
                'ports':  parts[3].strip() if len(parts) > 3 else '',
                'owner':  'root',
            })
    return containers


def get_all_root_containers():
    """ALL root docker containers (unfiltered)."""
    stdout, _ = _run(
        "docker ps -a --format '{{.Names}}|{{.Status}}|{{.Image}}|{{.Ports}}' 2>/dev/null"
    )
    containers = []
    if stdout:
        for line in stdout.split('\n'):
            if '|' not in line:
                continue
            parts = line.split('|')
            containers.append({
                'name':   parts[0].strip(),
                'status': parts[1].strip(),
                'image':  parts[2].strip(),
                'ports':  parts[3].strip() if len(parts) > 3 else '',
                'owner':  'root',
            })
    return containers


# ────────────────────────────────────────────────────────────────
# CONTAINER STATS
# ────────────────────────────────────────────────────────────────

def get_container_stats(docker_socket=None):
    """One-shot stats snapshot. Returns dict keyed by container name."""
    if docker_socket:
        cmd = (
            f"DOCKER_HOST=unix://{docker_socket} "
            f"docker stats --no-stream --format "
            f"'{{{{.Name}}}}|{{{{.CPUPerc}}}}|{{{{.MemUsage}}}}|{{{{.MemPerc}}}}|{{{{.NetIO}}}}|{{{{.BlockIO}}}}' 2>/dev/null"
        )
    else:
        cmd = (
            "docker stats --no-stream --format "
            "'{{.Name}}|{{.CPUPerc}}|{{.MemUsage}}|{{.MemPerc}}|{{.NetIO}}|{{.BlockIO}}' 2>/dev/null"
        )

    stdout, _ = _run(cmd, timeout=30)
    stats = {}
    if stdout:
        for line in stdout.split('\n'):
            if '|' not in line:
                continue
            parts = line.split('|')
            if len(parts) < 6:
                continue
            name = parts[0].strip()
            stats[name] = {
                'cpu':     parts[1].strip(),
                'mem':     parts[2].strip(),
                'mem_pct': parts[3].strip(),
                'net':     parts[4].strip(),
                'block':   parts[5].strip(),
            }
    return stats


def get_all_stats():
    """Stats for root + all rootless-user containers combined."""
    all_stats = get_container_stats()
    try:
        import pwd
        for pw in pwd.getpwall():
            if pw.pw_uid < 1000 or pw.pw_name == 'nobody':
                continue
            sock = f"/run/user/{pw.pw_uid}/docker.sock"
            if os.path.exists(sock):
                user_stats = get_container_stats(docker_socket=sock)
                all_stats.update(user_stats)
    except Exception as e:
        print(f"[stats] Error: {e}")
    return all_stats


def get_system_info():
    """Host-level system stats."""
    cpu_out, _    = _run("top -bn1 | grep 'Cpu(s)' | awk '{print $2+$4}'")
    mem_out, _    = _run("free -m | awk 'NR==2{printf \"%s/%sMB\", $3, $2}'")
    mem_pct, _    = _run("free | awk 'NR==2{printf \"%.0f\", $3/$2*100}'")
    disk_out, _   = _run("df -h / | awk 'NR==2{printf \"%s/%s\", $3, $2}'")
    disk_pct, _   = _run("df / | awk 'NR==2{print $5}' | tr -d '%'")
    load_out, _   = _run("cat /proc/loadavg | awk '{print $1, $2, $3}'")
    uptime_out, _ = _run("uptime -p")
    docker_v, _   = _run("docker --version | cut -d' ' -f3 | tr -d ','")

    return {
        'cpu_pct':  cpu_out or '0',
        'memory':   mem_out or 'N/A',
        'mem_pct':  mem_pct or '0',
        'disk':     disk_out or 'N/A',
        'disk_pct': disk_pct or '0',
        'load':     load_out or 'N/A',
        'uptime':   uptime_out or 'N/A',
        'docker_v': docker_v or 'N/A',
    }