#!/usr/bin/env bash
# shellcheck shell=bash
# Default Go workflow: tidy → fmt → vet → test → build
# Runs automatically when `docker run casjaysdev/go` is called with no args.
# Working directory is expected to be a Go module root (go.mod must exist).
set -euo pipefail

# Resolve the working directory — prefer /app if mounted, else cwd
WORK_DIR="${GOWORKDIR:-${PWD}}"
cd "$WORK_DIR"

# Require a go.mod so we fail fast with a clear message instead of cryptic go errors
if [ ! -f "go.mod" ]; then
  echo "Error: no go.mod found in ${WORK_DIR}" >&2
  echo "Mount your project with: docker run --rm -v \"\$(pwd)\":/app casjaysdev/go" >&2
  exit 1
fi

MODULE="$(awk '/^module /{print $2}' go.mod)"
echo ""
echo "▶ Go workflow: ${MODULE}"
echo "  Working dir: ${WORK_DIR}"
echo ""

run_step() {
  local label="$1"; shift
  echo "── ${label}"
  "$@"
  echo ""
}

# Resolve build mode from MODE or the legacy GO_PROD=1 flag.
# MODE=prod|production  → strip binary (-trimpath -ldflags=-s -w); applied to go build only
# MODE=dev|devel|development → default; full debug info, readable stack traces
# GO_PROD=1 is kept for backwards compatibility and takes effect when MODE is unset.
_IS_PROD=0
case "${MODE:-}" in
  prod | production)           _IS_PROD=1 ;;
  dev | devel | development)   _IS_PROD=0 ;;
  "")
    [ "${GO_PROD:-0}" = "1" ] && _IS_PROD=1
    ;;
  *)
    echo "Warning: unknown MODE '${MODE}' — expected prod|production|dev|devel|development; defaulting to development" >&2
    ;;
esac

BUILD_FLAGS=()
if [ "$_IS_PROD" = "1" ]; then
  echo "  (mode: production — -trimpath -ldflags=-s -w)"
  BUILD_FLAGS=(-trimpath -ldflags="-s -w")
else
  echo "  (mode: development)"
fi

# 1. Sync module graph and go.sum before anything reads them
run_step "go mod tidy" go mod tidy
# 2. Format all Go source files in place
run_step "gofmt -w ." gofmt -w .
# 3. Catch suspicious constructs
run_step "go vet ./..." go vet ./...
# 4. Run tests — fail fast before wasting time on a build
run_step "go test ./..." go test ./...
# 5. Build all main packages; output lands alongside source in each package dir
run_step "go build ./..." go build "${BUILD_FLAGS[@]}" ./...

echo "✅ Done."