# 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_dir = "$root_build_dir/ui"
ui_gen_dir = "$target_out_dir/gen"
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 = [
    ":assets_dist",
    ":controller_bundle_dist",
    ":engine_bundle_dist",
    ":frontend_bundle_dist",
    ":index_dist",
    ":scss",
    ":test_scripts",
    ":wasm_dist",
  ]
}

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

# +----------------------------------------------------------------------------+
# | Template for "sorcery" the source map resolver.                            |
# +----------------------------------------------------------------------------+
template("sorcery") {
  node_bin(target_name) {
    assert(defined(invoker.input))
    assert(defined(invoker.output))
    forward_variables_from(invoker, [ "deps" ])
    inputs = [
      invoker.input,
    ]
    outputs = [
      invoker.output,
      invoker.output + ".map",
    ]
    node_cmd = "sorcery"
    args = [
      "-i",
      rebase_path(invoker.input, root_build_dir),
      "-o",
      rebase_path(invoker.output, root_build_dir),
    ]
  }
}

# +----------------------------------------------------------------------------+
# | Template for bundling js                                                   |
# +----------------------------------------------------------------------------+
template("bundle") {
  node_bin(target_name) {
    assert(defined(invoker.input))
    assert(defined(invoker.output))
    forward_variables_from(invoker, [ "deps" ])
    inputs = [
      invoker.input,
      "rollup.config.js",
    ]
    outputs = [
      invoker.output,
      invoker.output + ".map",
    ]
    node_cmd = "rollup"
    args = [
      "-c",
      rebase_path("rollup.config.js", root_build_dir),
      rebase_path(invoker.input, root_build_dir),
      "-o",
      rebase_path(invoker.output, root_build_dir),
      "-f",
      "iife",
      "-m",
      "--silent",
    ]
  }
}

# +----------------------------------------------------------------------------+
# | 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.

bundle("frontend_bundle") {
  deps = [
    ":transpile_all_ts",
  ]
  input = "$target_out_dir/frontend/index.js"
  output = "$target_out_dir/frontend_bundle.js"
}

bundle("controller_bundle") {
  deps = [
    ":transpile_all_ts",
  ]
  input = "$target_out_dir/controller/index.js"
  output = "$target_out_dir/controller_bundle.js"
}

bundle("engine_bundle") {
  deps = [
    ":transpile_all_ts",
  ]
  input = "$target_out_dir/engine/index.js"
  output = "$target_out_dir/engine_bundle.js"
}

# +----------------------------------------------------------------------------+
# | Protobuf: gen rules to create .js and .d.ts files from protos.             |
# +----------------------------------------------------------------------------+
node_bin("protos_to_js") {
  inputs = []
  foreach(proto, trace_processor_protos) {
    inputs += [ "../protos/perfetto/trace_processor/$proto.proto" ]
  }
  inputs += [ "../protos/perfetto/config/perfetto_config.proto" ]
  outputs = [
    "$ui_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 = [
    "$ui_gen_dir/protos.js",
  ]
  outputs = [
    "$ui_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 under |src|.
node_bin("transpile_all_ts") {
  deps = [
    ":dist_symlink",
    ":protos_to_ts",
    ":wasm_gen",
  ]
  inputs = [
    "tsconfig.json",
  ]
  outputs = [
    "$target_out_dir/frontend/index.js",
    "$target_out_dir/engine/index.js",
    "$target_out_dir/controller/index.js",
  ]

  depfile = root_out_dir + "/tsc.d"
  exec_script("../gn/standalone/glob.py",
              [
                "--root=" + rebase_path(".", root_build_dir),
                "--filter=*.ts",
                "--exclude=node_modules",
                "--exclude=dist",
                "--deps=obj/ui/frontend/index.js",
                "--output=" + rebase_path(depfile),
              ],
              "")

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

# +----------------------------------------------------------------------------+
# | Build css.                                                                 |
# +----------------------------------------------------------------------------+

# Build css.
node_bin("scss") {
  deps = [
    ":dist_symlink",
  ]
  main_css = "src/assets/perfetto.scss"
  inputs = [
    main_css,
    "src/assets/sidebar.scss",
    "src/assets/topbar.scss",
  ]
  outputs = [
    "$ui_dir/perfetto.css",
  ]

  node_cmd = "node-sass"
  args = [
    "--quiet",
    rebase_path(main_css, root_build_dir),
    rebase_path(outputs[0], root_build_dir),
  ]
}

# +----------------------------------------------------------------------------+
# | Copy rules: create the final output directory.                             |
# +----------------------------------------------------------------------------+
copy("index_dist") {
  sources = [
    "index.html",
  ]
  outputs = [
    "$ui_dir/index.html",
  ]
}

copy("assets_dist") {
  sources = [
    "src/assets/flamegraph.svg",
    "src/assets/logo-3d.png",
    "src/assets/logo.png",
    "src/assets/perfetto.scss",
    "src/assets/sidebar.scss",
    "src/assets/topbar.scss",
  ]
  outputs = [
    "$ui_dir/assets/{{source_file_part}}",
  ]
}

sorcery("frontend_bundle_dist") {
  deps = [
    ":frontend_bundle",
  ]
  input = "$target_out_dir/frontend_bundle.js"
  output = "$ui_dir/frontend_bundle.js"
}

sorcery("controller_bundle_dist") {
  deps = [
    ":controller_bundle",
  ]
  input = "$target_out_dir/controller_bundle.js"
  output = "$ui_dir/controller_bundle.js"
}

sorcery("engine_bundle_dist") {
  deps = [
    ":engine_bundle",
  ]
  input = "$target_out_dir/engine_bundle.js"
  output = "$ui_dir/engine_bundle.js"
}

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

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

# +----------------------------------------------------------------------------+
# | Node JS: Creates a symlink in the out directory to node_modules.           |
# +----------------------------------------------------------------------------+

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 rollup and other node tools from the out/xxx directory.
action("node_modules_symlink") {
  deps = [
    ":check_node_exists",
  ]

  script = "../gn/standalone/build_tool_wrapper.py"
  stamp_file = "$target_out_dir/.$target_name.stamp"
  args = [
    "--stamp",
    rebase_path(stamp_file, root_build_dir),
    "/bin/ln",
    "-fns",
    rebase_path("node_modules", target_out_dir),
    rebase_path("$target_out_dir/node_modules", root_build_dir),
  ]
  outputs = [
    stamp_file,
  ]
}

group("node_modules") {
  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 = "$target_out_dir/.$target_name.stamp"
  args = [
    "--stamp",
    rebase_path(stamp_file, root_build_dir),
    "/bin/ln",
    "-fns",
    rebase_path(target_out_dir, "."),
    rebase_path("dist", root_build_dir),
  ]
  inputs = [
    "$root_build_dir",
  ]
  outputs = [
    stamp_file,
  ]
}

group("test_scripts") {
  deps = [
    ":copy_tests_script",
    ":copy_unittests_script",
  ]
}

copy("copy_unittests_script") {
  sources = [
    "config/ui_unittests_template",
  ]
  outputs = [
    "$root_build_dir/ui_unittests",
  ]
}

copy("copy_tests_script") {
  sources = [
    "config/ui_tests_template",
  ]
  outputs = [
    "$root_build_dir/ui_tests",
  ]
}