#!/usr/bin/env bash
# Generate Dart bindings for the F∆I gRPC surface.
#
# Reads .proto files from the sibling fai_chain repo and
# writes Dart code into lib/src/generated/. Run after
# `dart pub global activate protoc_plugin` so that
# `protoc-gen-dart` is on PATH (`$HOME/.pub-cache/bin`).
#
# Usage:
#   tools/generate.sh
#
# Env overrides:
#   PROTO_ROOT   Path to fai_chain/proto/ (default: ../fai_chain/proto)
#   OUT_DIR      Output dir (default: lib/src/generated)
set -euo pipefail

SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
SDK_ROOT="$( cd -- "$SCRIPT_DIR/.." && pwd )"

PROTO_ROOT="${PROTO_ROOT:-$SDK_ROOT/../fai_chain/proto}"
OUT_DIR="${OUT_DIR:-$SDK_ROOT/lib/src/generated}"

if [[ ! -d "$PROTO_ROOT" ]]; then
  echo "error: PROTO_ROOT does not exist: $PROTO_ROOT" >&2
  echo "Set PROTO_ROOT to the fai_chain/proto directory." >&2
  exit 1
fi

if ! command -v protoc >/dev/null 2>&1; then
  echo "error: protoc not found on PATH" >&2
  echo "Install: brew install protobuf  (macOS)" >&2
  exit 1
fi

# Make sure protoc-gen-dart is reachable. pub-cache/bin is the
# canonical location after `dart pub global activate protoc_plugin`.
export PATH="$HOME/.pub-cache/bin:$PATH"
if ! command -v protoc-gen-dart >/dev/null 2>&1; then
  echo "error: protoc-gen-dart not found" >&2
  echo "Install: dart pub global activate protoc_plugin" >&2
  exit 1
fi

mkdir -p "$OUT_DIR"

# Find every proto file under the package root and pass them to
# protoc with --dart_out for messages and grpc=true for services.
PROTO_FILES=()
while IFS= read -r -d '' file; do
  PROTO_FILES+=("$file")
done < <(find "$PROTO_ROOT" -name '*.proto' -print0)

if [[ ${#PROTO_FILES[@]} -eq 0 ]]; then
  echo "error: no .proto files found under $PROTO_ROOT" >&2
  exit 1
fi

# Locate the well-known-types include directory. Only needed
# for protoc's resolver; we do NOT generate the WKT Dart files
# anymore — `package:protobuf` (6.x+) ships them as
# `well_known_types/google/protobuf/empty.pb.dart` etc., and
# emitting our own copy creates duplicate-Empty-type errors at
# the API boundary (HubAdminClient expects the packaged Empty,
# our local copy is a distinct type to the analyser).
WKT_INCLUDE=""
for candidate in \
  "/opt/homebrew/include" \
  "/usr/local/include" \
  "/usr/include"; do
  if [[ -f "$candidate/google/protobuf/empty.proto" ]]; then
    WKT_INCLUDE="$candidate"
    break
  fi
done

if [[ -z "$WKT_INCLUDE" ]]; then
  echo "error: google/protobuf/empty.proto not found in standard include dirs" >&2
  echo "Install protobuf (brew install protobuf) so the well-known types ship alongside protoc." >&2
  exit 1
fi

# Wipe any stale WKT files generated by an earlier (pre-
# protobuf-6) version of this script. Keeping them around
# silently revives the duplicate-types breakage above on
# regen.
rm -rf "$OUT_DIR/google"

echo "generating Dart bindings"
echo "  protos: ${#PROTO_FILES[@]} files under $PROTO_ROOT"
echo "  WKT include: $WKT_INCLUDE (protoc resolver only)"
echo "  output: $OUT_DIR"

protoc \
  --proto_path="$PROTO_ROOT" \
  --proto_path="$WKT_INCLUDE" \
  --dart_out=grpc:"$OUT_DIR" \
  "${PROTO_FILES[@]}"

echo "done. generated files:"
find "$OUT_DIR" -name '*.dart' | sort