# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

assert(is_fuchsia)

import("//build/dart/dart_package.gni")

# Defines a Flutter application
#
# Parameters
#
#   main_dart (required)
#     Name of the Dart file containing the main function.
#
#   package_name (optional)
#     Name of the Dart package.
#
#   output_name (optional)
#     Name of output to generate. Defaults to $target_name.flx.
#
#   deps (optional)
#     List of Dart packages the application depends on.
template("flutter_app") {
  assert(defined(invoker.main_dart), "Must define main_dart")

  dart_package_name = target_name + "_dart_package"

  dart_package(dart_package_name) {
    forward_variables_from(invoker, [ "deps", "source_dir" ])
    if (defined(invoker.package_name)) {
      package_name = invoker.package_name
    } else {
      infer_package_name = true
    }
  }

  if (defined(invoker.output_name)) {
    bundle_name = invoker.output_name
  } else {
    bundle_name = "${target_name}.flx"
  }

  flutter_snapshot_label = "//flutter/snapshotter($host_toolchain)"
  flutter_snapshot_dir = get_label_info(flutter_snapshot_label, "root_out_dir")
  flutter_snapshot = "$flutter_snapshot_dir/sky_snapshot"

  dart_binary_label = "//dart/runtime/bin:dart_no_observatory($host_toolchain)"
  dart_binary_dir = get_label_info(dart_binary_label, "root_out_dir")
  dart_binary = "$dart_binary_dir/dart_no_observatory"

  flutter_root = "//lib/flutter"
  flutter_tools_label = "$flutter_root/packages/flutter_tools"
  flutter_tools_gen_dir = get_label_info(flutter_tools_label, "target_gen_dir")
  flutter_tools_name = get_label_info(flutter_tools_label, "name")
  flutter_tools_packages = "$flutter_tools_gen_dir/$flutter_tools_name.packages"
  flutter_tools_main = "$flutter_tools_label/bin/fuchsia_builder.dart"

  dot_packages = "$target_gen_dir/$dart_package_name.packages"
  bundle_path = "$root_out_dir/$bundle_name"
  snapshot_path = "$target_gen_dir/${target_name}_snapshot.bin"
  depfile_path = "${snapshot_path}.d"

  main_dart = invoker.main_dart

  flutter_snapshot_name = target_name + "_snapshot"

  action(flutter_snapshot_name) {
    depfile = depfile_path

    inputs = [
      main_dart,
    ]

    outputs = [
      snapshot_path,
    ]

    if (defined(invoker.sources)) {
      sources = invoker.sources
    }

    script = "//flutter/build/snapshot.py"

    args = [
      "--snapshotter-path",
      rebase_path(flutter_snapshot),
      "--app-dir",
      rebase_path("."),
      "--main-dart",
      rebase_path(main_dart),
      "--packages",
      rebase_path(dot_packages),
      "--snapshot",
      rebase_path(snapshot_path),
      "--depfile",
      rebase_path(depfile_path),
      "--build-output",
      rebase_path(snapshot_path, root_build_dir),

    ]

    deps = [
      ":$dart_package_name",
      flutter_snapshot_label,
    ]

    if (defined(invoker.deps)) {
      deps += invoker.deps
    }
  }

  action(target_name) {
    inputs = [
      snapshot_path,
    ]

    outputs = [
      bundle_path,
    ]

    script = "//flutter/build/package.py"

    args = [
      "--root",
      rebase_path(dart_binary_dir),
      "--flutter-root",
      rebase_path(flutter_root),
      "--dart",
      rebase_path(dart_binary),
      "--flutter-tools-packages",
      rebase_path(flutter_tools_packages),
      "--flutter-tools-main",
      rebase_path(flutter_tools_main),
      "--working-dir",
      rebase_path("$target_gen_dir/build"),
      "--app-dir",
      rebase_path("."),
      "--packages",
      rebase_path(dot_packages),
      "--output-file",
      rebase_path(bundle_path),
      "--snapshot",
      rebase_path(snapshot_path),
    ]

    deps = [
      ":$flutter_snapshot_name",
      dart_binary_label,
      flutter_tools_label,
    ]
  }
}