#!/bin/bash

# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.

echo "Starting installation script..."

# Step 1: Install Python requirements
echo "Installing Python requirements from requirements.txt..."
pip install -r requirements-build.txt
pip install -r requirements.txt
if [ $? -ne 0 ]; then
    echo "Error: Failed to install Python requirements."
    exit 1
else
    echo "Python requirements installed successfully."
fi

# Step 2: Define LLVM version and architecture
LLVM_VERSION="10.0.1"
IS_AARCH64=false
EXTRACT_PATH="3rdparty"
echo "LLVM version set to ${LLVM_VERSION}."
echo "Is AARCH64 architecture: $IS_AARCH64"

# Step 3: Determine the correct Ubuntu version based on LLVM version
UBUNTU_VERSION="16.04"
if [[ "$LLVM_VERSION" > "17.0.0" ]]; then
    UBUNTU_VERSION="22.04"
elif [[ "$LLVM_VERSION" > "16.0.0" ]]; then
    UBUNTU_VERSION="20.04"
elif [[ "$LLVM_VERSION" > "13.0.0" ]]; then
    UBUNTU_VERSION="18.04"
fi
echo "Ubuntu version for LLVM set to ${UBUNTU_VERSION}."

# Step 4: Set download URL and file name for LLVM
BASE_URL="https://github.com/llvm/llvm-project/releases/download/llvmorg-${LLVM_VERSION}"
if $IS_AARCH64; then
    FILE_NAME="clang+llvm-${LLVM_VERSION}-aarch64-linux-gnu.tar.xz"
else
    FILE_NAME="clang+llvm-${LLVM_VERSION}-x86_64-linux-gnu-ubuntu-${UBUNTU_VERSION}.tar.xz"
fi
DOWNLOAD_URL="${BASE_URL}/${FILE_NAME}"
echo "Download URL for LLVM: ${DOWNLOAD_URL}"

# Step 5: Create extraction directory
echo "Creating extraction directory at ${EXTRACT_PATH}..."
mkdir -p "$EXTRACT_PATH"
if [ $? -ne 0 ]; then
    echo "Error: Failed to create extraction directory."
    exit 1
else
    echo "Extraction directory created successfully."
fi

# Step 6: Download LLVM
echo "Downloading $FILE_NAME from $DOWNLOAD_URL..."
curl -L -o "${EXTRACT_PATH}/${FILE_NAME}" "$DOWNLOAD_URL"
if [ $? -ne 0 ]; then
    echo "Error: Download failed!"
    exit 1
else
    echo "Download completed successfully."
fi

# Step 7: Extract LLVM
echo "Extracting $FILE_NAME to $EXTRACT_PATH..."
tar -xJf "${EXTRACT_PATH}/${FILE_NAME}" -C "$EXTRACT_PATH"
if [ $? -ne 0 ]; then
    echo "Error: Extraction failed!"
    exit 1
else
    echo "Extraction completed successfully."
fi

# Step 8: Determine LLVM config path
LLVM_CONFIG_PATH="$(realpath ${EXTRACT_PATH}/$(basename ${FILE_NAME} .tar.xz)/bin/llvm-config)"
echo "LLVM config path determined as: $LLVM_CONFIG_PATH"

# Step 9: Clone and build TVM
echo "Cloning TVM repository and initializing submodules..."
# clone and build tvm
git submodule update --init --recursive

if [ -d build ]; then
    rm -rf build
fi

mkdir build
cp 3rdparty/tvm/cmake/config.cmake build
cd build


echo "Configuring TVM build with LLVM and CUDA paths..."
echo "set(USE_LLVM $LLVM_CONFIG_PATH)" >> config.cmake && echo "set(USE_CUDA /usr/local/cuda)" >> config.cmake

echo "Running CMake for TileLang..."
cmake ..
if [ $? -ne 0 ]; then
    echo "Error: CMake configuration failed."
    exit 1
fi

echo "Building TileLang with make..."

# Calculate 75% of available CPU cores
# Other wise, make will use all available cores
# and it may cause the system to be unresponsive
CORES=$(nproc)
MAKE_JOBS=$(( CORES * 75 / 100 ))
make -j${MAKE_JOBS}

if [ $? -ne 0 ]; then
    echo "Error: TileLang build failed."
    exit 1
else
    echo "TileLang build completed successfully."
fi

cd ..

# Step 11: Set environment variables
TILELANG_PATH="$(pwd)"
echo "TileLang path set to: $TILELANG_PATH"
echo "Configuring environment variables for TVM..."
echo "export PYTHONPATH=${TILELANG_PATH}:\$PYTHONPATH" >> ~/.bashrc
echo "export CUDA_DEVICE_ORDER=PCI_BUS_ID" >> ~/.bashrc

# Step 12: Source .bashrc to apply changes
echo "Applying environment changes by sourcing .bashrc..."
source ~/.bashrc
if [ $? -ne 0 ]; then
    echo "Error: Failed to source .bashrc."
    exit 1
else
    echo "Environment configured successfully."
fi

echo "Installation script completed successfully."
