cmake_minimum_required(VERSION 3.15)
project(AMGExamples Fortran)

# Installation directories (passed as CMake variables)
set(AMG_INSTALL_DIR "" CACHE PATH "Path to AMG installation")
set(PSBLAS_INSTALL_DIR "" CACHE PATH "Path to PSBLAS installation")

# Check if installation directories are set
if(NOT AMG_INSTALL_DIR)
    message(FATAL_ERROR "AMG_INSTALL_DIR must be set.  Use -DAMG_INSTALL_DIR=/path/to/amg when running CMake.")
endif()

if(NOT PSBLAS_INSTALL_DIR)
    message(FATAL_ERROR "PSBLAS_INSTALL_DIR must be set.  Use -DPSBLAS_INSTALL_DIR=/path/to/psblas when running CMake.")
endif()

# Include directories
include_directories(
    "."
    "${AMG_INSTALL_DIR}/include"
    "${AMG_INSTALL_DIR}/modules"
    "${PSBLAS_INSTALL_DIR}/include" 
)

# Fortran module directory
set(CMAKE_Fortran_MODULE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/modules")
set(FMFLAG "-I") 

# Library directories
link_directories(
    "${AMG_INSTALL_DIR}/lib"
    "${PSBLAS_INSTALL_DIR}/lib"
)

# Libraries
set(AMG_LIBS psb_linsolve amg_prec psb_prec)
set(PSBLAS_LIBS psb_util psb_linsolve psb_prec psb_base) 

# Executable directory
set(EXEDIR "${CMAKE_CURRENT_BINARY_DIR}/runs")
file(MAKE_DIRECTORY "${EXEDIR}")

# Source files
set(DMOBJS amg_dexample_ml.f90 data_input.f90)
set(D1OBJS amg_dexample_1lev.f90 data_input.f90)
set(ZMOBJS amg_zexample_ml.f90 data_input.f90)
set(Z1OBJS amg_zexample_1lev.f90 data_input.f90)
set(SMOBJS amg_sexample_ml.f90 data_input.f90)
set(S1OBJS amg_sexample_1lev.f90 data_input.f90)
set(CMOBJS amg_cexample_ml.f90 data_input.f90)
set(C1OBJS amg_cexample_1lev.f90 data_input.f90)

# Function to create executable
macro(create_amg_executable target sources)
    add_executable(${target} ${sources})
    target_link_libraries(${target} PUBLIC
        ${AMG_LIBS}
        ${PSBLAS_LIBS}

    )

    # Move executable to EXEDIR (post-build)
    add_custom_command(TARGET ${target} POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E move $<TARGET_FILE:${target}> ${EXEDIR}
    )
endmacro()

# Create executables
create_amg_executable(amg_dexample_ml ${DMOBJS})
create_amg_executable(amg_dexample_1lev ${D1OBJS})
create_amg_executable(amg_zexample_ml ${ZMOBJS})
create_amg_executable(amg_zexample_1lev ${Z1OBJS})
create_amg_executable(amg_sexample_ml ${SMOBJS})
create_amg_executable(amg_sexample_1lev ${S1OBJS})
create_amg_executable(amg_cexample_ml ${CMOBJS})
create_amg_executable(amg_cexample_1lev ${C1OBJS})

# Create "runs" directory (if it doesn't exist)
add_custom_target(create_runs_dir
    COMMAND ${CMAKE_COMMAND} -E make_directory "${EXEDIR}"
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    COMMENT "Creating runs directory"
)
add_dependencies(amg_dexample_ml create_runs_dir)
add_dependencies(amg_dexample_1lev create_runs_dir)
add_dependencies(amg_zexample_ml create_runs_dir)
add_dependencies(amg_zexample_1lev create_runs_dir)
add_dependencies(amg_sexample_ml create_runs_dir)
add_dependencies(amg_sexample_1lev create_runs_dir)
add_dependencies(amg_cexample_ml create_runs_dir)
add_dependencies(amg_cexample_1lev create_runs_dir)


# lib target
add_custom_target(lib
    COMMAND ${CMAKE_COMMAND} -E chdir "../../" ${CMAKE_COMMAND} --build . --target library
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    COMMENT "Building library"
)

# verycleanlib target
add_custom_target(verycleanlib
    COMMAND ${CMAKE_COMMAND} -E chdir "../../" ${CMAKE_COMMAND} --build . --target veryclean
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    COMMENT "Cleaning library"
)

# Install target (optional)
install(TARGETS
    amg_dexample_ml
    amg_dexample_1lev
    amg_zexample_ml
    amg_zexample_1lev
    amg_sexample_ml
    amg_sexample_1lev
    amg_cexample_ml
    amg_cexample_1lev
    DESTINATION bin
)