# Copyright 2014 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.

import("//build/toolchain/toolchain.gni")

template("python_binary_source_set") {
  # Only available on linux for now.
  assert(is_linux)
  assert(defined(invoker.cython_sources) || defined(invoker.sources))

  config_name = target_name + "_python_config"

  target_visibility = [ ":$target_name" ]

  if (defined(invoker.cython_sources)) {
    generator_target_name = target_name + "_cython_compiler"

    cython_root = "//third_party/cython"
    cython_script = "$cython_root/src/cython.py"
    cython_output = "${target_out_dir}/${target_name}.cc"

    action(generator_target_name) {
      visibility = target_visibility
      script = cython_script
      sources = invoker.cython_sources
      outputs = [
        cython_output,
      ]
      args = [
               "--cplus",
               "-I",
               rebase_path("//", root_build_dir),
               "-I",
               rebase_path(target_gen_dir, root_build_dir),
               "-o",
               rebase_path(cython_output, root_build_dir),
             ] + rebase_path(sources, root_build_dir)
    }
  }

  config(config_name) {
    visibility = target_visibility
    python_flags = "//third_party/cython/python_flags.py"
    include_dirs = exec_script(python_flags, [ "--includes" ], "list lines")
    libs = exec_script(python_flags, [ "--libraries" ], "list lines")
    lib_dirs = exec_script(python_flags, [ "--library_dirs" ], "list lines")
    if (!is_win) {
      # Generated code includes static utility functions that often go unused.
      cflags = [ "-Wno-unused-function" ]
    }
  }

  source_set(target_name) {
    if (defined(invoker.visibility)) {
      visibility = invoker.visibility
    }
    sources = []
    if (defined(invoker.cython_sources)) {
      sources += [ cython_output ]
    }
    if (defined(invoker.sources)) {
      sources += invoker.sources
    }
    if (defined(invoker.configs)) {
      configs += invoker.configs
    }
    all_dependent_configs = [ ":$config_name" ]
    deps = []
    if (defined(invoker.cython_sources)) {
      deps += [ ":$generator_target_name" ]
    }
    if (defined(invoker.deps)) {
      deps += invoker.deps
    }
    if (defined(invoker.datadeps)) {
      datadeps = invoker.datadeps
    }
  }
}

template("python_binary_module") {
  # Only available on linux for now.
  assert(is_linux)

  has_sources = defined(invoker.cython_sources) || defined(invoker.sources)

  assert(has_sources || defined(invoker.deps))
  assert(
      !defined(invoker.python_base_module) || invoker.python_base_module != "")

  sources_target_name = target_name + "_cython_sources"
  shared_library_name = target_name + "_shared_library"

  if (is_linux) {
    shared_library_prefix = "lib"
    shared_library_suffix = ".so"
    python_module_suffix = ".so"
  }

  target_visibility = [
    ":$sources_target_name",
    ":$shared_library_name",
    ":$target_name",
  ]

  if (has_sources) {
    python_binary_source_set(sources_target_name) {
      visibility = target_visibility
      if (defined(invoker.cython_sources)) {
        cython_sources = invoker.cython_sources
      }
      if (defined(invoker.sources)) {
        sources = invoker.sources
      }
      if (defined(invoker.configs)) {
        configs = invoker.configs
      }
      if (defined(invoker.deps)) {
        deps = invoker.deps
      }
      if (defined(invoker.datadeps)) {
        datadeps = invoker.datadeps
      }
    }
  }

  shared_library(shared_library_name) {
    visibility = target_visibility
    if (defined(invoker.configs)) {
      configs += invoker.configs
    }
    deps = []
    if (has_sources) {
      deps += [ ":$sources_target_name" ]
    }
    if (defined(invoker.deps)) {
      deps += invoker.deps
    }
    if (defined(invoker.datadeps)) {
      datadeps = invoker.datadeps
    }
  }

  copy(target_name) {
    if (defined(invoker.python_base_module)) {
      python_base_module = invoker.python_base_module
      output = "$root_out_dir/python/$python_base_module/${target_name}${python_module_suffix}"
    } else {
      output = "$root_out_dir/python/${target_name}${python_module_suffix}"
    }

    sources = [
      "$root_shlib_dir/${shared_library_prefix}${shared_library_name}${shared_library_suffix}",
    ]
    outputs = [
      output,
    ]
    deps = [
      ":$shared_library_name",
    ]
  }
}