from .ssh import SSHClient

class DNSManager:
    def __init__(self, config):
        self.pve_host = config.get('proxmox.host')
        self.pve_user = config.get('proxmox.user', 'root')
        self.lxc_id = config.get('proxmox.dnsmasq_lxc_id')
        self.ssh_key = config.get('proxmox.ssh_key')
        self.client = SSHClient(self.pve_host, self.pve_user, self.ssh_key)
        
        self.hosts_file = "/etc/dnsmasq.d/dynamic-hosts.conf"
        self.dns_file = "/etc/dnsmasq.d/dynamic-dns.conf"

    def exec_lxc(self, cmd):
        return self.client.run(f"pct exec {self.lxc_id} -- {cmd}")

    def add_host(self, mac, ip, hostname):
        self.exec_lxc(f"touch {self.hosts_file}")
        # Check for duplicates
        res = self.exec_lxc(f"grep -q -F '{mac}' {self.hosts_file}")
        if res.returncode == 0:
            raise ValueError(f"MAC {mac} already exists")
        
        self.client.run(f"pct exec {self.lxc_id} -- sh -c \"echo 'dhcp-host={mac},{hostname},{ip}' >> {self.hosts_file}\")
        self.reload()

    def remove_host(self, mac):
        self.exec_lxc(f"sed -i '/{mac}/d' {self.hosts_file}")
        self.reload()

    def add_dns(self, domain, ip):
        self.exec_lxc(f"touch {self.dns_file}")
        self.client.run(f"pct exec {self.lxc_id} -- sh -c \"echo 'address=/{domain}/{ip}' >> {self.dns_file}\")
        self.reload()

    def remove_dns(self, domain):
        self.client.run(f"pct exec {self.lxc_id} -- sh -c \"sed -i '\#address=/{domain}/#d' {self.dns_file}\")
        self.reload()

    def reload(self):
        res = self.exec_lxc("dnsmasq --test")
        if res.returncode == 0:
            self.exec_lxc("systemctl reload dnsmasq")
        else:
            raise RuntimeError(f"Dnsmasq config test failed: {res.stderr}")

    def list(self):
        hosts = self.exec_lxc(f"cat {self.hosts_file}").stdout
        dns = self.exec_lxc(f"cat {self.dns_file}").stdout
        return {"hosts": hosts, "dns": dns}