# Copyright 2019 The Fuchsia 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/config/fuchsia/zircon.gni")
import("//build/sdk/sdk_atom.gni")

sysroot_toolchain = "//build/zircon:zircon_toolchain"
sysroot_dir = get_label_info(":sysroot($sysroot_toolchain)", "target_out_dir")
sysroot_dir += "/sysroot"

# Collect the metadata for the SDK.
file_base = "arch/$target_cpu/sysroot"
sdk_files = []

version_content = {
  root = file_base

  include_dir = "$file_base/include"
  headers = []
  link_libs = []
  dist_libs = []
  debug_libs = []
}

# Turn the information from Zircon into a set of copy() rules for the
# sysroot while filling in $version_content.
sysroot_deps = []
i = 0
foreach(entry, zircon_legacy_sysroot) {
  if (defined(entry.sdk)) {
    sdk = {
    }
    sdk = entry.sdk
    if (defined(sdk.headers)) {
      # This has to generate a separate copy() target for each file.
      dir = rebase_path(sdk.include_dir, "", zircon_root_build_dir)
      foreach(file, sdk.headers) {
        i = i + 1
        if (current_toolchain == sysroot_toolchain) {
          copy_target = "copy_$i"
          sysroot_deps += [ ":$copy_target" ]
          copy(copy_target) {
            visibility = [ ":sysroot" ]
            sources = [
              "$dir/$file",
            ]
            outputs = [
              "$sysroot_dir/include/$file",
            ]
          }
        }
        version_content.headers += [ "$file_base/include/$file" ]
        sdk_files += [
          {
            source = "$dir/$file"
            dest = "$file_base/include/$file"
          },
        ]
      }
    } else if (defined(sdk.debug)) {
      version_content.debug_libs +=
          [ rebase_path(sdk.source, "", zircon_root_build_dir) ]
    } else {
      # This is just a single copy() target.
      if (defined(sdk.link)) {
        file = "$sysroot_dir/${sdk.link}"
        version_content.link_libs += [ "$file_base/${sdk.link}" ]
        sdk_files += [
          {
            source = rebase_path(sdk.source, "", zircon_root_build_dir)
            dest = "$file_base/${sdk.link}"
          },
        ]
      } else if (defined(sdk.dist)) {
        file = "$sysroot_dir/${sdk.dist}"
        version_content.dist_libs += [ "$file_base/${sdk.dist}" ]
        sdk_files += [
          {
            source = rebase_path(sdk.source, "", zircon_root_build_dir)
            dest = "$file_base/${sdk.dist}"
          },
        ]
      } else {
        assert(false, "confused by $sdk")
      }
      i = i + 1
      if (current_toolchain == sysroot_toolchain) {
        copy_target = "copy_$i"
        sysroot_deps += [ ":$copy_target" ]
        copy(copy_target) {
          visibility = [ ":sysroot" ]
          sources = [
            "$zircon_root_build_dir/${sdk.source}",
          ]
          outputs = [
            file,
          ]
        }
      }
    }
  }
}

group("sysroot") {
  if (current_toolchain == sysroot_toolchain) {
    deps = sysroot_deps
  } else {
    assert(sysroot_deps == [])
    public_deps = [
      ":sysroot($sysroot_toolchain)",
    ]
  }
}

write_file("$target_gen_dir/sysroot.meta.in.json",
           {
             type = "sysroot"
             name = "sysroot"
             versions = {
               if (target_cpu == "arm64") {
                 arm64 = version_content
               } else if (target_cpu == "x64") {
                 x64 = version_content
               } else {
                 assert(false, "Unknown CPU type: $target_cpu")
               }
             }
           },
           "json")

action("sysroot-meta") {
  visibility = [ ":*" ]
  script = "//build/zircon/sdk_build_id.py"
  sources = [
    "$target_gen_dir/sysroot.meta.in.json",
  ]
  outputs = [
    "$target_out_dir/sysroot.meta.out.json",
    "$target_out_dir/sysroot.debug.manifest",
  ]
  args = [
    "--input=" + rebase_path(sources[0], root_build_dir),
    "--output=" + rebase_path(outputs[0], root_build_dir),
    "--manifest=" + rebase_path(outputs[1], root_build_dir),
    "--location=/versions/$target_cpu/debug_libs",
  ]
}
meta_outputs = get_target_outputs(":sysroot-meta")

sdk_atom("sysroot_sdk") {
  id = "sdk://pkg/sysroot"
  category = "partner"

  non_sdk_deps = [ ":sysroot-meta" ]

  meta = {
    dest = "pkg/sysroot/meta.json"
    schema = "sysroot"
    source = meta_outputs[0]
  }

  files = sdk_files
  file_list = meta_outputs[1]
}