---
- name: Set DHCP configuration variables
  set_fact:
    br_if: "br_{{ gateway_config.lab_name }}"
    dhcp_tag: "{{ gateway_config.lab_name }}"

- name: Calculate DHCP range based on role
  set_fact:
    dhcp_start: "{{ gateway_config.subnet | ipaddr('10') | ipaddr('address') if gateway_config.dhcp_role == 'primary' else gateway_config.subnet | ipaddr('128') | ipaddr('address') }}"
    dhcp_limit: "{{ 118 if gateway_config.dhcp_role == 'primary' else 118 }}"
  when: gateway_config.dhcp_mode == "simple"

- name: Calculate DHCP range for failover simulation
  set_fact:
    dhcp_start: "{{ gateway_config.subnet | ipaddr('10') | ipaddr('address') }}"
    dhcp_limit: 236
  when: gateway_config.dhcp_mode == "failover"

- name: Remove existing DHCP configuration for this lab
  shell: |
    uci delete dhcp.{{ dhcp_tag }} 2>/dev/null || true
    uci commit dhcp
  changed_when: true

- name: Configure DHCP server
  shell: |
    uci set dhcp.{{ dhcp_tag }}='dhcp'
    uci set dhcp.{{ dhcp_tag }}.interface='{{ br_if }}'
    uci set dhcp.{{ dhcp_tag }}.start='{{ dhcp_start | ipaddr('host') }}'
    uci set dhcp.{{ dhcp_tag }}.limit='{{ dhcp_limit }}'
    uci set dhcp.{{ dhcp_tag }}.leasetime='12h'
    uci add_list dhcp.{{ dhcp_tag }}.dhcp_option='3,{{ gateway_config.subnet | ipaddr("1") | ipaddr("address") }}'
    uci add_list dhcp.{{ dhcp_tag }}.dhcp_option='6,{{ gateway_config.subnet | ipaddr("1") | ipaddr("address") }}'
    uci commit dhcp
  changed_when: true

- name: Configure DNS domain for lab network
  shell: |
    uci set dhcp.{{ dhcp_tag }}.domain='{{ gateway_config.lab_name }}.lab'
    uci set dhcp.{{ dhcp_tag }}.local='/{{ gateway_config.lab_name }}.lab/'
    uci commit dhcp
  changed_when: true

- name: Set DHCP authoritative mode based on role
  shell: |
    uci set dhcp.{{ dhcp_tag }}.authoritative='{{ "1" if gateway_config.dhcp_role == "primary" else "0" }}'
    uci commit dhcp
  changed_when: true
  when: gateway_config.dhcp_mode == "failover"

- name: Restart dnsmasq
  shell: /etc/init.d/dnsmasq restart
  changed_when: true

- name: Wait for dnsmasq to start
  shell: pgrep dnsmasq
  register: dnsmasq_check
  retries: 5
  delay: 2
  until: dnsmasq_check.rc == 0
  changed_when: false

- name: Verify DHCP configuration
  shell: |
    echo "=== DHCP Configuration ==="
    uci show dhcp.{{ dhcp_tag }}
    echo ""
    echo "=== dnsmasq Process ==="
    ps | grep dnsmasq | grep -v grep
    echo ""
    echo "=== DHCP Leases ==="
    cat /tmp/dhcp.leases 2>/dev/null || echo "No leases yet"
  register: dhcp_status
  changed_when: false

- name: Display DHCP status
  debug:
    var: dhcp_status.stdout_lines