#!/usr/bin/env bash
set -euo pipefail

project_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
vendor_root="${project_root}/vendor"
source_root="${vendor_root}/source"
tool_root="${vendor_root}/tools"
work_root="${vendor_root}/work"
destination="${source_root}/v8"
depot_tools="${tool_root}/depot_tools"
depot_revision="c0148d63d4909b3f27c9df5b6273efc496bc4459"
v8_revision="49df3678d1b6a1511167b15a6b7499d3ab37a638"

if [[ -d "${destination}" ]]; then
    printf 'V8 source already present: %s\n' "${destination}"
    exit 0
fi

mkdir -p "${source_root}" "${tool_root}" "${work_root}"

if [[ ! -d "${depot_tools}" ]]; then
    temporary_tools="$(mktemp -d "${work_root}/depot-tools.XXXXXX")"
    git -C "${temporary_tools}" init --quiet
    git -C "${temporary_tools}" remote add origin https://chromium.googlesource.com/chromium/tools/depot_tools.git
    git -C "${temporary_tools}" fetch --quiet --depth 1 origin "${depot_revision}"
    git -C "${temporary_tools}" checkout --quiet --detach FETCH_HEAD
    mv "${temporary_tools}" "${depot_tools}"
fi

workspace="${work_root}/v8-sync"
mkdir -p "${workspace}"

export PATH="${depot_tools}:${PATH}"
export DEPOT_TOOLS_UPDATE=0

if [[ ! -f "${workspace}/.gclient" ]]; then
    (
        cd "${workspace}"
        gclient config --unmanaged https://chromium.googlesource.com/v8/v8.git
    )
fi

(
    cd "${workspace}"
    gclient sync --revision "v8@${v8_revision}" --no-history --nohooks
    gclient runhooks
)

mv "${workspace}/v8" "${destination}"