import("//third_party/v8/gni/v8.gni")
import("//third_party/v8/snapshot_toolchain.gni")
import("//build_extra/flatbuffers/flatbuffer.gni")
import("//build_extra/deno.gni")
import("//build_extra/rust/rust.gni")

group("all") {
  testonly = true
  deps = [
    ":deno",
    ":deno_ns",
    ":handlers_test",
    ":test_cc",
  ]
}

config("deno_config") {
  include_dirs = [ "third_party/v8" ]  # This allows us to v8/src/base/ libraries.
  configs = [ "third_party/v8:external_config" ]
  if (is_debug) {
    defines = [ "DEBUG" ]
  }

  # Targets built with the `rust_executable()` template automatically pick up
  # these dependencies, but those built with `executable()` need them when they
  # have Rust inputs. Currently, there's only one such target, `test_cc`.
  if (is_mac) {
    libs = [ "resolv" ]
  }
  if (is_win) {
    libs = [ "userenv.lib" ]
  }
}

rust_executable("deno") {
  source_root = "src/main.rs"
  extern = [
    "$rust_build:libc",
    "$rust_build:log",
  ]
  deps = [
    ":libdeno",
  ]
}

# This target is for fast incremental development.
# When modifying the javascript runtime, this target will not go through the
# extra process of building a snapshot and instead load the bundle from disk.
# ns = no snapshot
rust_executable("deno_ns") {
  source_root = "src/main.rs"
  extern = [
    "$rust_build:libc",
    "$rust_build:log",
  ]
  deps = [
    ":libdeno_nosnapshot",
  ]
}

rust_staticlib("handlers") {
  source_root = "src/handlers.rs"
  extern = [
    "$rust_build:libc",
    "$rust_build:url",
    "$rust_build:log",
  ]
}

rust_test("handlers_test") {
  source_root = "src/handlers.rs"
  extern = [
    "$rust_build:libc",
    "$rust_build:url",
    "$rust_build:log",

    # Indirect rust depdendencies also need to be listed here:
    # * Linking to `:handlers` or `:libdeno` isn't possible, because they
    #   already contain some symbols exported by `handlers.rs`. These duplicate
    #   symbols trip up the linker.
    # * The `rust_test` and `rust_executable` templates only produce an object
    #   file, and then invoke an external linker. Transitive rust depencenies
    #   are not resolved in either step.
    "$rust_build:idna",
    "$rust_build:percent_encoding",
    "$rust_build:unicode_bidi",
    "$rust_build:unicode_normalization",
  ]
  deps = [
    ":deno_bindings",
  ]
}

executable("test_cc") {
  testonly = true
  sources = [
    "src/flatbuffer_builder_test.cc",
    "src/test.cc",
  ]
  deps = [
    ":deno_base_test",
    ":deno_bindings",
    ":handlers",
    "//testing/gtest:gtest",
  ]
  configs += [ ":deno_config" ]
}

static_library("libdeno") {
  complete_static_lib = true
  sources = [
    "src/from_snapshot.cc",
  ]
  deps = [
    ":create_snapshot_deno",
    ":deno_bindings",
    ":handlers",
  ]
  configs += [ ":deno_config" ]
}

# Only functionality needed for mock_runtime_test and snapshot_creator
# In particular no flatbuffers, no assets, no rust, no msg handlers.
# Because snapshots are slow, it's important that snapshot_creator's
# dependencies are minimal.
v8_source_set("deno_base") {
  sources = [
    "src/binding.cc",
    "src/deno.h",
    "src/file_util.cc",
    "src/file_util.h",
    "src/internal.h",
  ]
  public_deps = [
    "third_party/v8:v8_monolith",
  ]
  configs = [ ":deno_config" ]
}

v8_source_set("deno_base_test") {
  testonly = true
  sources = [
    "src/file_util_test.cc",
    "src/from_snapshot.cc",
    "src/mock_runtime_test.cc",
  ]
  deps = [
    ":create_snapshot_mock_runtime",
    ":deno_base",
    "//testing/gtest:gtest",
  ]
  defines = [ "DENO_MOCK_RUNTIME" ]
  configs = [ ":deno_config" ]
}

v8_source_set("deno_bindings") {
  sources = [
    "src/flatbuffer_builder.cc",
    "src/flatbuffer_builder.h",
    "src/reply.cc",
    "src/reply.h",
  ]
  deps = [
    ":deno_base",
    ":msg_cpp",
  ]
  public_deps = [
    "build_extra/flatbuffers:flatbuffers",
  ]
  configs = [ ":deno_config" ]
}

executable("snapshot_creator") {
  sources = [
    "src/snapshot_creator.cc",
  ]
  deps = [
    ":deno_base",
  ]
  configs += [ ":deno_config" ]
}

flatbuffer("msg_cpp") {
  sources = [
    "src/msg.fbs",
  ]
}

run_node("bundle") {
  out_dir = "$target_gen_dir/bundle/"
  sources = [
    "js/assets.ts",
    "js/console.ts",
    "js/deno.d.ts",
    "js/dispatch.ts",
    "js/globals.ts",
    "js/main.ts",
    "js/msg_generated.ts",
    "js/os.ts",
    "js/runtime.ts",
    "js/types.ts",
    "js/util.ts",
    "package.json",  # The `browserslist` field controls Babel behavior.
  ]
  outputs = [
    out_dir + "main.js",
    out_dir + "main.map",
  ]
  deps = [
    ":flatbufferjs",
    ":run_tsc",
  ]
  args = [
    "./node_modules/parcel-bundler/bin/cli.js",
    "build",
    "--log-level=1",  # Only disply errors.
    "--no-minify",
    "--out-dir",
    rebase_path(out_dir, root_build_dir),
    rebase_path("js/main.ts", root_build_dir),
  ]
}

source_set("libdeno_nosnapshot") {
  sources = [
    "src/from_filesystem.cc",
  ]
  deps = [
    ":bundle",
    ":deno_bindings",
    ":handlers",
  ]
  configs += [ ":deno_config" ]
  bundle_outputs = get_target_outputs(":bundle")
  bundle_location = rebase_path(bundle_outputs[0])
  defines = [ "BUNDLE_LOCATION=\"$bundle_location\"" ]
}

# Due to bugs in Parcel we must run TSC independently in order to catch errors.
# https://github.com/parcel-bundler/parcel/issues/954
run_node("run_tsc") {
  main = "js/main.ts"
  tsconfig = "tsconfig.json"
  out_dir = "$target_gen_dir/tsc_dist/"
  sources = [
    "js/msg_generated.ts",
    main,
    tsconfig,
  ]
  outputs = [
    out_dir + "/main.js",
  ]
  deps = [
    ":flatbufferjs",
  ]
  args = [
    "./node_modules/typescript/bin/tsc",
    "--project",
    rebase_path(tsconfig, root_build_dir),
    "--outDir",
    rebase_path(out_dir, root_build_dir),
  ]
}

# Generates flatbuffer TypeScript code.
# TODO(ry) Ideally flatc output files should be written into
# target_gen_dir, but its difficult to get this working in a way that the
# bundler can resolve their location. (The bundler does not support NODE_PATH?)
# Therefore this hack: write the msg_generated.ts output
# into the js/ folder, and we check it into the repo. Hopefully this hack can
# be removed at some point. If msg.fps is changed, commit changes to the
# generated JS files. The stamp file is just to make gn work.
action("flatbufferjs") {
  script = "//tools/flatbufferjs_hack.py"
  sources = [
    "src/msg.fbs",
  ]
  outputs = [
    "$target_gen_dir/flatbufferjs_hack.stamp",
  ]

  args = [
    rebase_path("$target_gen_dir/msg_generated.ts", root_build_dir),
    rebase_path("js/msg_generated.ts", root_build_dir),
    rebase_path(outputs[0], root_build_dir),
  ]

  deps = [
    ":msg_ts",
  ]
}

ts_flatbuffer("msg_ts") {
  sources = [
    "src/msg.fbs",
  ]
}

# Generates $target_gen_dir/snapshot_deno.cc
create_snapshot("deno") {
  js = "$target_gen_dir/bundle/main.js"
  deps = [
    ":bundle",
  ]
}

# Generates $target_gen_dir/snapshot_mock_runtime.cc
create_snapshot("mock_runtime") {
  testonly = true
  js = "js/mock_runtime.js"
  deps = []
}