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

repository_dir=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
cd "$repository_dir"

baseline_toolchain=${CONFIGKIT_BASELINE_TOOLCHAIN:?set CONFIGKIT_BASELINE_TOOLCHAIN to a cached supported Go 1.25 patch release}
newer_toolchain=${CONFIGKIT_NEWER_TOOLCHAIN:?set CONFIGKIT_NEWER_TOOLCHAIN to a cached newer supported Go toolchain}

run_go() {
  local toolchain=$1
  shift
  GOTOOLCHAIN="$toolchain" GOPROXY=off go "$@"
}

check_toolchain() {
  local toolchain=$1
  GOTOOLCHAIN="$toolchain" GOPROXY=off go version >/dev/null
  run_go "$toolchain" mod download
}

check_toolchain "$baseline_toolchain"
check_toolchain "$newer_toolchain"
bash -n scripts/release-check.sh

temporary_dir=$(mktemp -d)
trap 'rm -rf -- "$temporary_dir"' EXIT
candidate_manifest=$temporary_dir/candidate-files
while IFS= read -r -d '' candidate_file; do
  if [[ -e "$candidate_file" || -L "$candidate_file" ]]; then
    printf '%s\0' "$candidate_file" >>"$candidate_manifest"
  fi
done < <(git ls-files --cached --others --exclude-standard -z)
tar --null --files-from="$candidate_manifest" --create --file=- |
  tar --extract --file=- --directory="$temporary_dir"
(
  cd "$temporary_dir"
  GOTOOLCHAIN="$baseline_toolchain" GOPROXY=off go mod tidy
)
diff -u go.mod "$temporary_dir/go.mod"
diff -u go.sum "$temporary_dir/go.sum"

go_files=()
while IFS= read -r -d '' go_file; do
  if [[ -f "$go_file" ]]; then
    go_files+=("$go_file")
  fi
done < <(git ls-files --cached --others --exclude-standard -z -- '*.go')
if ((${#go_files[@]})); then
  unformatted=$(gofmt -l -- "${go_files[@]}")
  if [[ -n "$unformatted" ]]; then
    printf 'gofmt required for:\n%s\n' "$unformatted" >&2
    exit 1
  fi
fi

git diff --check HEAD --
while IFS= read -r -d '' candidate_file; do
  if [[ ! -f "$candidate_file" ]]; then
    continue
  fi
  case "$candidate_file" in
    *.go|*.md|*.sh|go.mod|go.sum|LICENSE|.gitignore|AGENTS.md)
      if LC_ALL=C grep -nE '[[:blank:]]+$' -- "$candidate_file"; then
        printf 'trailing whitespace found in %s\n' "$candidate_file" >&2
        exit 1
      fi
      ;;
  esac
done < <(git ls-files --cached --others --exclude-standard -z)

for toolchain in "$baseline_toolchain" "$newer_toolchain"; do
  run_go "$toolchain" test ./...
  run_go "$toolchain" vet ./...
  run_go "$toolchain" build ./...
done

run_go "$newer_toolchain" test -race ./...
run_go "$newer_toolchain" test . -run '^Example'
run_go "$newer_toolchain" test ./examples/consumers
run_go "$newer_toolchain" test . -run '^TestLocalDocumentationLinks$'
run_go "$newer_toolchain" test . -run '^TestDependencyImportBoundary$'

for target in linux/amd64 linux/arm64 darwin/amd64 darwin/arm64; do
  target_os=${target%/*}
  target_arch=${target#*/}
  GOTOOLCHAIN="$newer_toolchain" GOPROXY=off CGO_ENABLED=0 GOOS="$target_os" GOARCH="$target_arch" go build ./...
done