# Copyright (C) 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("../gn/perfetto.gni")
import("../gn/wasm.gni")
import("../protos/perfetto/trace_processor/proto_files.gni")

ui_dist_dir = "$root_build_dir/ui"
nodejs_root = "../buildtools/nodejs"
nodejs_bin = rebase_path("$nodejs_root/bin", root_build_dir)

# +----------------------------------------------------------------------------+
# | The outer "ui" target to just ninja -C out/xxx ui                          |
# +----------------------------------------------------------------------------+
group("ui") {
  deps = [
    ":bundle",
    ":index",
    ":wasm",
  ]
}

# +----------------------------------------------------------------------------+
# | Template used to run node binaries using the hermetic node toolchain.      |
# +----------------------------------------------------------------------------+
template("node_bin") {
  action(target_name) {
    forward_variables_from(invoker,
                           [
                             "inputs",
                             "outputs",
                           ])
    deps = [
      ":node_modules",
    ]
    if (defined(invoker.deps)) {
      deps += invoker.deps
    }
    script = "../gn/standalone/build_tool_wrapper.py"
    _node_cmd = invoker.node_cmd
    args = [
             "--path=$nodejs_bin",
             "node",
             rebase_path("node_modules/.bin/$_node_cmd", root_build_dir),
           ] + invoker.args
  }
}

# +----------------------------------------------------------------------------+
# | Bundles all *.js files together resolving CommonJS require() deps.         |
# +----------------------------------------------------------------------------+

# Bundle together all js sources into a bundle.js file, that will ultimately be
# included by the .html files.
node_bin("bundle") {
  deps = [
    ":transpile_all_ts",
  ]
  node_cmd = "browserify"
  inputs = [
    "$ui_dist_dir/main.js",
  ]
  outputs = [
    "$ui_dist_dir/bundle.js",
  ]
  args = [
    rebase_path(inputs[0], root_build_dir),
    "-d",
    "-o",
    rebase_path(outputs[0], root_build_dir),
  ]
}

# +----------------------------------------------------------------------------+
# | Protobuf: gen rules to create .js and .d.ts files from protos.             |
# +----------------------------------------------------------------------------+
proto_gen_dir = "$ui_dist_dir/gen"

node_bin("protos_to_js") {
  inputs = []
  foreach(proto, trace_processor_protos) {
    inputs += [ "../protos/perfetto/trace_processor/$proto.proto" ]
  }
  outputs = [
    "$proto_gen_dir/protos.js",
  ]
  node_cmd = "pbjs"
  args = [
           "-t",
           "static-module",
           "-w",
           "commonjs",
           "-p",
           rebase_path("../protos", root_build_dir),
           "-o",
           rebase_path(outputs[0], root_build_dir),
         ] + rebase_path(inputs, root_build_dir)
}

# Protobuf.js requires to first generate .js files from the .proto and then
# create .ts definitions for them.
node_bin("protos_to_ts") {
  deps = [
    ":protos_to_js",
  ]
  inputs = [
    "$proto_gen_dir/protos.js",
  ]
  outputs = [
    "$proto_gen_dir/protos.d.ts",
  ]
  node_cmd = "pbts"
  args = [
    "-p",
    rebase_path("../protos", root_build_dir),
    "-o",
    rebase_path(outputs[0], root_build_dir),
    rebase_path(inputs[0], root_build_dir),
  ]
}

# +----------------------------------------------------------------------------+
# | TypeScript: transpiles all *.ts into .js                                   |
# +----------------------------------------------------------------------------+

# Builds all .ts sources in the repo that are reachable from |sources|.
node_bin("transpile_all_ts") {
  sources = [
    "main.ts",
  ]
  deps = [
    ":dist_symlink",
    ":protos_to_ts",
  ]
  inputs = sources + [ "tsconfig.json" ]
  outputs = [
    "$ui_dist_dir/main.js",
  ]

  # Find all *.ts files and pass them as input triggers. This does NOT affect
  # which files will get built. This defines only the set of files that, when
  # changes, will re-trigger this rule in ninja. The files that get transpiled
  # are the transitive dependencies of |sources|.
  all_ts_files = exec_script("../gn/standalone/glob.py",
                             [
                               "--root=" + rebase_path(".", root_build_dir),
                               "--filter=*.ts",
                               "--exclude=node_modules",
                               "--exclude=dist",
                             ],
                             "list lines",
                             [ "." ])
  inputs += all_ts_files

  node_cmd = "tsc"
  args = [
    "--project",
    rebase_path(".", root_build_dir),
    "--outDir",
    rebase_path(ui_dist_dir, root_build_dir),
  ]
}

# +----------------------------------------------------------------------------+
# | Copy rules: copy assets into the dist directory.                           |
# +----------------------------------------------------------------------------+
copy("index") {
  sources = [
    "index.html",
  ]
  outputs = [
    "$ui_dist_dir/index.html",
  ]
}

copy("wasm") {
  deps = [
    "//src/trace_processor:trace_processor.js($wasm_toolchain)",
    "//src/trace_processor:trace_processor.wasm($wasm_toolchain)",
  ]
  sources = [
    "$root_build_dir/wasm/trace_processor.js",
    "$root_build_dir/wasm/trace_processor.wasm",
  ]
  outputs = [
    "$ui_dist_dir/wasm/{{source_file_part}}",
  ]
}

# +----------------------------------------------------------------------------+
# | Node JS: run npm install and creates a symlink in the out directory.       |
# +----------------------------------------------------------------------------+

action("check_node_exists") {
  script = "../gn/standalone/check_buildtool_exists.py"
  args = [
    nodejs_bin,
    "--touch",
    rebase_path("$target_out_dir/node_exists", ""),
  ]
  inputs = []
  outputs = [
    "$target_out_dir/node_exists",
  ]
}

# Creates a symlink from out/xxx/ui/node_modules -> ../../../ui/node_modules.
# This allows to run browserify and other node tools from the out/xxx directory.
action("node_modules_symlink") {
  deps = [
    ":check_node_exists",
  ]
  inputs = [
    "node_modules",
  ]
  outputs = [
    "$ui_dist_dir/node_modules",
  ]
  script = "../gn/standalone/build_tool_wrapper.py"
  args = [
    "/bin/ln",
    "-fns",
    rebase_path(inputs[0], ui_dist_dir),
    rebase_path(outputs[0], root_build_dir),
  ]
}

# Runs npm install.
action("node_modules") {
  script = "../gn/standalone/build_tool_wrapper.py"
  stamp_file = "$ui_dist_dir/.$target_name.stamp"
  args = [
    "--chdir",
    rebase_path(".", root_build_dir),
    "--stamp",
    rebase_path(stamp_file, root_build_dir),
  ]
  args += [
    "--path=$nodejs_bin",
    "node",
    rebase_path("$nodejs_root/bin/npm", "."),
    "install",
    "--no-save",
    "--silent",
  ]
  inputs = [
    "package.json",
    "package-lock.json",
  ]
  outputs = [
    stamp_file,
  ]
  deps = [
    ":node_modules_symlink",
  ]
}

# Creates a symlink from //ui/dist -> ../../out/xxx/ui. Used only for
# autocompletion in IDEs. The problem this is solving is that in tsconfig.json
# we can't possibly know the path to ../../out/xxx for outDir. Instead, we set
# outDir to "./dist" and create a symlink on the first build.
action("dist_symlink") {
  script = "../gn/standalone/build_tool_wrapper.py"
  stamp_file = "$ui_dist_dir/.$target_name.stamp"
  args = [
    "--stamp",
    rebase_path(stamp_file, root_build_dir),
    "/bin/ln",
    "-fns",
    rebase_path(ui_dist_dir, "."),
    rebase_path("dist", root_build_dir),
  ]
  inputs = [
    "$root_build_dir",
  ]
  outputs = [
    stamp_file,
  ]
}