#!/bin/bash
# Copyright 2020 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# WARNING: This is not supposed to be directly executed by users.

set -o errexit

function fx-flash {
  local enable_ipv4="${FX_ENABLE_IPV4:-false}"
  local serial="$1"
  local device="$2"
  local flash_manifest="$3"

  # Process devices in gigaboot.
  gb_device_ip=
  num_gb_devices=0
  while read line; do
    # Split line into IP and nodename.
    elements=($line)
    if [[ ! -z "${device}" ]]; then
      if [[ "${elements[1]}" == "${device}" ]]; then
        gb_device_ip=${elements[0]}
        num_gb_devices=1
        break
      fi
    else
      let num_gb_devices=$num_gb_devices+1
      gb_device_ip=${elements[0]}
    fi
  done < <(fx-command-run host-tool --check-firewall device-finder list -ipv4="${enable_ipv4}" -netboot -full)

  if [[ $num_gb_devices > 1 ]]; then
    echo "More than one device detected, please provide -device <device>"
    return 1
  fi

  ffx_flash_args=("fuchsia" "--ssh-key" "$(get-ssh-authkeys)") || {
    fx-warn "Cannot find a valid authorized keys file. Recovery will be flashed."
    ffx_flash_args=("recovery")
  }

  flash_args=("--ssh-key=$(get-ssh-authkeys)") || {
    fx-warn "Cannot find a valid authorized keys file. Recovery will be flashed."
    flash_args=("--recovery")
  }

  if [[ ! -z "${gb_device_ip}" ]]; then
    "./flash.sh" "${flash_args[@]}" "-s" "udp:${gb_device_ip}"
  else
    # Process traditional fastboot over USB.
    fastboot_args=()
    ffx_args=()
    if [[ -z "${serial}" ]]; then
      # If the user didn't specify a device with -s, see if there's exactly 1.
      num_devices=$(fx-command-run host-tool fastboot devices | wc -l)
      if [[ "${num_devices}" -lt 1 ]]; then
        fx-error "No device detected, boot into fastboot mode or provide -s <serial>!"
        return 1
      elif [[ "${num_devices}" -gt 1 ]]; then
        fx-error "More than one device detected, please provide -s <serial>!"
        return 1
      fi
    else
      fastboot_args=("-s" "${serial}")
      ffx_args=("-t" "${serial}")
    fi

    if is_feature_enabled "legacy_fastboot"; then
      fx-warn "Using legacy flash method via 'fastboot'"
      fx-warn "To use the current ffx-based flash method, don't use the flag '--enable=legacy_fastboot' and unset the 'FUCHSIA_DISABLED_legacy_fastboot' environment variable."

      "./flash.sh" "${flash_args[@]}" "${fastboot_args[@]}"
    else
      if [[ ! -f "${flash_manifest}" ]]; then
        fx-error "Flash manifest: '${flash_manifest}' not found"
        return 1
      fi

      fx-info "Running fx ffx ${ffx_args[@]} target flash ${flash_manifest} ${ffx_flash_args[@]}"
      fx-command-run host-tool --check-firewall ffx "${ffx_args[@]}" target flash "${flash_manifest}" "${ffx_flash_args[@]}"
    fi
  fi
}