# Copyright 2013 The Flutter 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("//flutter/tools/fuchsia/dart/dart_library.gni")
import("//flutter/tools/fuchsia/dart/dart_package_config.gni")
import("//flutter/tools/fuchsia/dart/toolchain.gni")

import("//flutter/tools/python/python3_action.gni")

# Wraps a dart snapshot in a script to be invoked by dart
#
# Parameters
#
#   dart (required)
#     The path to the dart binary
#
#   snapshot (required)
#     The path to the dart snapshot
#
#   deps (optional)
#     Dependencies of this application
#
#   output_name (optional)
#     Name of the output file to generate. Defaults to $target_name.
template("_dart_snapshot_invocation") {
  assert(defined(invoker.dart), "Must specify the path to the dart binary")
  assert(defined(invoker.snapshot),
         "Must specify the path to the dart snapshot")

  if (defined(invoker.output_name)) {
    app_name = invoker.output_name
  } else {
    app_name = target_name
  }

  # Builds a convenience script to invoke the app.
  python3_action(target_name) {
    forward_variables_from(invoker,
                           [
                             "testonly",
                             "deps",
                           ])

    script = "//flutter/tools/fuchsia/dart/gen_app_invocation.py"

    app_path = "$root_out_dir/dart-tools/$app_name"
    dart_binary = invoker.dart
    snapshot = invoker.snapshot

    inputs = [
      dart_binary,
      snapshot,
    ]
    outputs = [ app_path ]

    args = [
      "--out",
      rebase_path(app_path, root_build_dir),

      # `--dart` and `--snapshot` are used in the output app script, use
      # absolute path so the script would work regardless where it's invoked.
      "--dart",
      rebase_path(dart_binary),
      "--snapshot",
      rebase_path(snapshot),
    ]

    metadata = {
      # Record metadata for the //:tool_paths build API.
      tool_paths = [
        {
          cpu = current_cpu
          label = get_label_info(":$target_name", "label_with_toolchain")
          name = app_name
          os = current_os
          path = rebase_path(app_path, root_build_dir)
        },
      ]
      snapshot_path = [ rebase_path(snapshot, root_build_dir) ]
    }
  }
}

# Defines a Dart application that can be run on the host which is
# compiled from an existing snapshot
#
# Parameters
#
#   snapshot (required)
#     The path to the dart snapshot
#
#   deps (optional)
#     Dependencies of this application
#
#   output_name (optional)
#     Name of the output file to generate. Defaults to $target_name.
template("dart_prebuilt_tool") {
  assert(defined(invoker.snapshot),
         "Must specify the path to the dart snapshot")
  _dart_snapshot_invocation(target_name) {
    dart = prebuilt_dart
    forward_variables_from(invoker, "*")
  }
}