#!/bin/bash
# Generate TypeScript declarations for Microsoft.EntityFrameworkCore.* from NuGet packages.
#
# Prerequisites:
#   - .NET 10 SDK installed
#   - tsbindgen repository cloned at ../tsbindgen (sibling directory)
#   - @tsonic/dotnet cloned at ../dotnet (sibling directory)
#   - @tsonic/microsoft-extensions cloned at ../microsoft-extensions (sibling directory)
#
# Usage:
#   ./__build/scripts/generate.sh

set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
TSBINDGEN_DIR="$PROJECT_DIR/../tsbindgen"
DOTNET_MAJOR="${DOTNET_MAJOR:-10}"
DOTNET_LIB="$PROJECT_DIR/../dotnet/versions/$DOTNET_MAJOR"
EXT_LIB="$PROJECT_DIR/../microsoft-extensions"
REF_DIR="$PROJECT_DIR/__build/ref"
SEMANTICS_FILE="$PROJECT_DIR/__build/templates/$DOTNET_MAJOR/tsbindgen.bindings-semantics.json"

DOTNET_VERSION="${DOTNET_VERSION:-10.0.1}"
DOTNET_HOME="${DOTNET_HOME:-$HOME/.dotnet}"
NETCORE_RUNTIME_PATH="$DOTNET_HOME/shared/Microsoft.NETCore.App/$DOTNET_VERSION"

echo "================================================================"
echo "Generating Microsoft.EntityFrameworkCore.* TypeScript Declarations"
echo "================================================================"
echo ""
echo "Configuration:"
echo "  .NET Runtime:       $NETCORE_RUNTIME_PATH"
echo "  BCL Library:        $DOTNET_LIB (external reference)"
echo "  Extensions Library: $EXT_LIB (external reference)"
echo "  tsbindgen:          $TSBINDGEN_DIR"
echo "  Ref project:        $REF_DIR"
echo "  Output:             $PROJECT_DIR"
echo "  Naming:             CLR (no transforms)"
echo ""

# Verify prerequisites
if [ ! -d "$NETCORE_RUNTIME_PATH" ]; then
    echo "ERROR: .NET runtime not found at $NETCORE_RUNTIME_PATH"
    echo "Set DOTNET_HOME or DOTNET_VERSION environment variables"
    exit 1
fi

if [ ! -d "$TSBINDGEN_DIR" ]; then
    echo "ERROR: tsbindgen not found at $TSBINDGEN_DIR"
    echo "Clone it: git clone https://github.com/tsoniclang/tsbindgen ../tsbindgen"
    exit 1
fi

if [ ! -d "$DOTNET_LIB" ]; then
    echo "ERROR: @tsonic/dotnet not found at $DOTNET_LIB"
    echo "Clone it: git clone https://github.com/tsoniclang/dotnet ../dotnet"
    exit 1
fi

if [ ! -d "$EXT_LIB" ]; then
    echo "ERROR: @tsonic/microsoft-extensions not found at $EXT_LIB"
    echo "Clone it: git clone https://github.com/tsoniclang/microsoft-extensions ../microsoft-extensions"
    exit 1
fi

if [ ! -f "$REF_DIR/ref.csproj" ]; then
    echo "ERROR: Reference project not found at $REF_DIR/ref.csproj"
    exit 1
fi

if [ ! -f "$SEMANTICS_FILE" ]; then
    echo "ERROR: bindings semantics config not found at $SEMANTICS_FILE"
    exit 1
fi

# Clean output directory (keep config files)
echo "[1/4] Cleaning output directory..."
cd "$PROJECT_DIR"

find . -maxdepth 1 -type d \
    ! -name '.' \
    ! -name '.git' \
    ! -name '.tests' \
    ! -name 'node_modules' \
    ! -name '__build' \
    -exec rm -rf {} \; 2>/dev/null || true

rm -f *.d.ts *.js families.json 2>/dev/null || true
rm -rf __internal Internal internal 2>/dev/null || true

echo "  Done"

echo "[2/4] Restoring reference project packages..."
dotnet restore "$REF_DIR/ref.csproj" --verbosity quiet
echo "  Done"

echo "[3/4] Building reference project..."
dotnet build "$REF_DIR/ref.csproj" -c Release --no-restore --verbosity quiet
echo "  Done"

# Build tsbindgen
echo "[4/4] Building + running tsbindgen..."
cd "$TSBINDGEN_DIR"
dotnet build src/tsbindgen/tsbindgen.csproj -c Release --verbosity quiet

REF_OUT="$REF_DIR/bin/Release/net10.0"
if [ ! -d "$REF_OUT" ]; then
    echo "ERROR: Reference build output not found at $REF_OUT"
    exit 1
fi

REF_DLLS=( "$REF_OUT"/*.dll )
if [ ! -f "${REF_DLLS[0]}" ]; then
    echo "ERROR: No dlls found in $REF_OUT"
    exit 1
fi

GEN_ARGS=()
for dll in "${REF_DLLS[@]}"; do
    GEN_ARGS+=( -a "$dll" )
done

# EF Core includes generic `new()` constraints that TypeScript cannot represent for instance-type generics.
# We explicitly allow this constraint loss to unblock generation (emitted as warnings by tsbindgen).
dotnet run --project src/tsbindgen/tsbindgen.csproj --no-build -c Release -- \
    generate "${GEN_ARGS[@]}" -d "$NETCORE_RUNTIME_PATH" -o "$PROJECT_DIR" \
    --allow-constructor-constraint-loss \
    --lib "$DOTNET_LIB" \
    --lib "$EXT_LIB" \
    --bindings-semantics "$SEMANTICS_FILE"

echo ""
echo "================================================================"
echo "Generation Complete"
echo "================================================================"