#!/usr/bin/env bash
# commands/network.command.sh
#
# Network diagnostics, port management, and host entries.
#
# Usage:
#   dx network status          — show port assignments and their status
#   dx network resolve         — re-run port resolution and show changes
#   dx network hosts <subcmd>  — manage /etc/hosts entries (delegates to hosts command)
#
# Hosts subcommands are also available directly:
#   dx hosts sync
#   dx hosts list
#   dx hosts remove

# ============================================
# Lifecycle
# ============================================

function cmd::network::on_load() {
  flag::register \
    --debug
}

# ============================================
# Public entrypoint
# ============================================

function cmd::network::run() {
  local subcmd="${1:-help}"
  shift || true

  case "$subcmd" in
    status)  cmd::network::status::run  "$@" ;;
    resolve) cmd::network::resolve::run "$@" ;;
    hosts)
      load_command hosts
      hosts::run "$@"
      ;;
    help)    cmd::network::help ;;
    *)
      log::error "Unknown subcommand: '${subcmd}'"
      cmd::network::help
      return 1
      ;;
  esac
}

# ============================================
# Help
# ============================================

function cmd::network::help() {
  cat <<EOF
Usage: dx network <subcommand>

Subcommands:
  status          Show current port assignments and their status
  resolve         Re-run port resolution and show what changed
  hosts <subcmd>  Manage /etc/hosts entries

Hosts subcommands:
  hosts sync      Sync project domain to /etc/hosts
  hosts list      Show current /etc/hosts entries for this project
  hosts remove    Remove project entries from /etc/hosts

Examples:
  dx network status
  dx network resolve
  dx network hosts sync
  dx hosts sync              (shorthand)
EOF
}

# ============================================
# Status
# ============================================

function cmd::network::status::run() {
  log::info "Port status for ${PROJECT_NAME}..."

  printf "\n"
  printf "%-20s %-10s %s\n" "Service" "Port"   "Status"
  printf "%-20s %-10s %s\n" "-------" "----"   "------"

  cmd::network::status::_report "App"      "$APP_PORT"
  cmd::network::status::_report "Database" "$(docker::db::external_port)"

  printf "\n"
}

function cmd::network::status::_report() {
  local label="$1"
  local port="$2"
  local status

  if ! network::ports::in_use "$port"; then
    status="✓  free"
  else
    local container
    container="$(docker ps --format '{{.Names}}' | grep "^${PROJECT_NAME}" | head -1)"

    if [[ -n "$container" ]]; then
      status="✓  in use by ${PROJECT_NAME}"
    else
      status="⚠️  in use by another process — run: dx network resolve"
    fi
  fi

  printf "%-20s %-10s %s\n" "$label" "$port" "$status"
}

# ============================================
# Resolve
# ============================================

function cmd::network::resolve::run() {
  log::info "Resolving ports for ${PROJECT_NAME}..."

  local old_app_port="$APP_PORT"
  local old_db_port
  old_db_port="$(docker::db::external_port)"

  network::ports::resolve_many APP_PORT DB_PORT

  local new_db_port
  new_db_port="$(docker::db::external_port)"

  printf "\n"
  printf "%-20s %-15s %-15s %s\n" "Service" "Current" "Resolved" "Status"
  printf "%-20s %-15s %-15s %s\n" "-------" "-------" "--------" "------"

  cmd::network::resolve::_report "App"      "$old_app_port" "$APP_PORT"
  cmd::network::resolve::_report "Database" "$old_db_port"  "$new_db_port"

  printf "\n"

  if [[ "$old_app_port" != "$APP_PORT" || "$old_db_port" != "$new_db_port" ]]; then
    log::warn "Ports changed — run 'dx build' to apply"
  else
    log::success "No changes — all ports are available"
  fi
}

function cmd::network::resolve::_report() {
  local label="$1"
  local old="$2"
  local resolved="$3"
  local status

  if [[ "$old" == "$resolved" ]]; then
    status="✓  unchanged"
  else
    status="⚠️  remapped: ${old} → ${resolved}"
  fi

  printf "%-20s %-15s %-15s %s\n" "$label" "$old" "$resolved" "$status"
}