#!/bin/sh
#
# Blaise — An Object Pascal Compiler
# Copyright (c) 2026 Graeme Geldenhuys
# SPDX-License-Identifier: Apache-2.0 WITH Swift-exception
# Licensed under the Apache License v2.0 with Runtime Library Exception.
# See LICENSE file in the project root for full license terms.
#
# pasbuild-blaise-compile — Build the Blaise compiler using a Blaise bootstrap binary.
#
# Phase: none  (standalone — does not chain after the FPC compile phase)
#
# Usage:
#   pasbuild blaise-compile
#   BLAISE_BOOTSTRAP=/path/to/blaise pasbuild blaise-compile
#
# Bootstrap binary discovery order:
#   1. BLAISE_BOOTSTRAP environment variable
#   2. Newest releases/vX.Y.Z/blaise binary in the project tree

set -e

case "$1" in
  --pasbuild-phase)
    echo "none"
    exit 0
    ;;
esac

# ---- Locate project directory ------------------------------------------------
PROJ="${PASBUILD_PROJECT_DIR:-$1}"
if [ -z "$PROJ" ]; then
  echo "[blaise-compile] ERROR: project directory not set" >&2
  exit 1
fi

# ---- Locate bootstrap binary -------------------------------------------------
if [ -n "$BLAISE_BOOTSTRAP" ]; then
  BLAISE="$BLAISE_BOOTSTRAP"
else
  BLAISE=$(find "$PROJ/releases" -name "blaise" -type f 2>/dev/null | sort -V | tail -1)
fi

if [ -z "$BLAISE" ] || [ ! -x "$BLAISE" ]; then
  echo "[blaise-compile] ERROR: no bootstrap binary found." >&2
  echo "  Set BLAISE_BOOTSTRAP=/path/to/blaise, or add a binary under releases/vX.Y.Z/blaise" >&2
  exit 1
fi

echo "[blaise-compile] Bootstrap : $BLAISE"
echo "[blaise-compile] Project   : $PROJ"

# ---- Paths -------------------------------------------------------------------
COMPILER_SRC="$PROJ/compiler/src/main/pascal"
RTL_SRC="$PROJ/rtl/src/main/pascal"
RTL_LIB="$PROJ/compiler/target/blaise_rtl.a"
QBE="$PROJ/vendor/qbe/qbe"
OUT_IR="$PROJ/compiler/target/blaise.ssa"
OUT_S="$PROJ/compiler/target/blaise.s"
OUT_BIN="$PROJ/compiler/target/blaise"

# ---- Step 1: Build RTL -------------------------------------------------------
echo "[blaise-compile] Building RTL..."
cd "$PROJ/rtl"
make --silent
make install --silent
cd "$PROJ"

# ---- Step 2: Emit QBE IR -----------------------------------------------------
echo "[blaise-compile] Emitting IR..."
"$BLAISE" \
  --source "$COMPILER_SRC/Blaise.pas" \
  --unit-path "$COMPILER_SRC" \
  --unit-path "$RTL_SRC" \
  --emit-ir > "$OUT_IR"

# ---- Step 3: Assemble --------------------------------------------------------
echo "[blaise-compile] Assembling..."
"$QBE" -o "$OUT_S" "$OUT_IR"

# ---- Step 4: Link ------------------------------------------------------------
echo "[blaise-compile] Linking..."
gcc -o "$OUT_BIN" "$OUT_S" "$RTL_LIB"

echo "[blaise-compile] Done: $OUT_BIN"
"$OUT_BIN" --help 2>&1 | head -1