# Copyright 2021 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.

import("//build/board.gni")
import("//build/json/validate_json.gni")
import("//build/product.gni")

# Generates a virtual device specification JSON from a product and board
# definition.
#
# There is normally a single such target in the build graph that generates
# metadata for the currently active board/product. The resulting metadata is
# uploaded to the artifact repository.
#
# A release builder subsequently fetches all available device profiles metadata
# and incorporates them into the single SDK release artifact.
#
# Parameters
#
#   name(required)
#     The name or identifier of the device. This name will be referenced from
#     the product bundle metadata.
#
#   testonly (optional)
#   visibility (optional)
#     Standard GN meaning.
#
# GN args pulled from build environment
#
#   emu_window_size_width (optional)
#     The emulator window size width. Defaults to 1280.
#     Defined in //build/product.gni.
#   emu_window_size_height (optional)
#     The emulator window size height. Defaults to 800.
#     Defined in //build/product.gni.
#   board_description (optional)
#     The human readable board description corresponding to the board name.
#     Defaults to "". Defined in //build/board.gni.
#   target_cpu
#     Standard GN meaning.
template("virtual_device_specification") {
  assert(defined(invoker.name), "Device name is required.")

  # This is the most recent schema.
  schema_file = "virtual_device-93A41932.json"
  schema_target = "//build/sdk/meta/${schema_file}"

  # Schema ID must match the schema file.
  schema_id = "http://fuchsia.com/schemas/sdk/${schema_file}"

  template_output = "${target_out_dir}/emulator_flags.json.template"
  template_target = "${target_name}_copy_template_file"

  emu_window_size = {
    height = 800
    width = 1280
    units = "pixels"
  }

  if (emu_window_size_width != false) {
    assert(emu_window_size_width > 0,
           "The window width must be > 0 in order to be visible")
    emu_window_size.width = emu_window_size_width
  }
  if (emu_window_size_height != false) {
    assert(emu_window_size_height > 0,
           "The window height must be > 0 in order to be visible")
    emu_window_size.height = emu_window_size_height
  }

  file_contents = {
    schema_id = schema_id
    data = {
      type = "virtual_device"
      name = invoker.name
      description = board_description
      hardware = {
        cpu = {
          arch = target_cpu
        }
        audio = {
          model = "hda"
        }
        inputs = {
          # Touch is the default to avoid issues with mouse capture
          # especially with cloudtops.
          pointing_device = "touch"
        }
        window_size = emu_window_size
        memory = {
          quantity = 8192
          units = "megabytes"
        }
        storage = {
          quantity = 2
          units = "gigabytes"
        }
      }
      ports = {
        ssh = 22
        mdns = 5353
        debug = 2345
      }

      # TODO(fxbug.dev/94125): remove once solution is available.
      start_up_args_template = rebase_path(template_output, root_build_dir)
    }
  }

  output = "${target_gen_dir}/virtual_device.json"
  generator_target = "${target_name}_json_generator"

  generated_file(generator_target) {
    visibility = [ ":*" ]
    forward_variables_from(invoker, [ "testonly" ])
    contents = file_contents
    output_conversion = "json"
    outputs = [ output ]
    metadata = {
      images = [
        {
          label = get_label_info(":$target_name", "label_with_toolchain")
          name = "virtual_device"
          path = rebase_path(output, root_build_dir)
          type = "manifest"
        },
      ]
    }
  }

  copy(template_target) {
    sources = [ "//src/developer/ffx/plugins/emulator/templates/emulator_flags.json.template" ]
    outputs = [ template_output ]
    metadata = {
      images = [
        {
          label = get_label_info(":$target_name", "label_with_toolchain")
          name = "emulator_flags"
          path = rebase_path(template_output, root_build_dir)
          type = "manifest"
        },
      ]
    }
  }

  validator_target = "${target_name}_json_validator"
  validate_json(validator_target) {
    visibility = [ ":*" ]
    forward_variables_from(invoker, [ "testonly" ])
    data = output
    deps = [ ":${generator_target}" ]
    schema = schema_target
    sources = [
      # Included schemata.
      "//build/sdk/meta/common.json",
      "//build/sdk/meta/hardware-f6f47515.json",
      "//build/sdk/meta/virtual_device-93A41932.json",
    ]
    allow_comments = true
  }

  group(target_name) {
    forward_variables_from(invoker,
                           [
                             "testonly",
                             "visibility",
                           ])
    deps = [
      ":${generator_target}",
      ":${template_target}",
      ":${validator_target}",
    ]
  }
}