if (NOT WIN32)
    message(FATAL_ERROR "Pre-NSIS installation is intended for windows only!")
endif()

if (NOT ASY_WIN_RESOURCE_DIR)
    message(FATAL_ERROR "ASY_WIN_RESOURCE_DIR is not defined.
Please ensure win32-specific.cmake is included before this file!")
endif()

if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
    set_property(CACHE CMAKE_INSTALL_PREFIX PROPERTY VALUE "${CMAKE_CURRENT_SOURCE_DIR}/cmake-install-win32")
endif()

# helper target for files needed
add_custom_target(asy-pre-nsis-targets DEPENDS asy asy-basefiles)

# check done, start configuration
set(ASYMPTOTE_NSI_CONFIGURATION_DIR ${CMAKE_CURRENT_BINARY_DIR}/nsifiles)
file(MAKE_DIRECTORY ${ASYMPTOTE_NSI_CONFIGURATION_DIR})

configure_file(
        ${ASY_WIN_RESOURCE_DIR}/AsymptoteInstallInfo.nsi.in
        ${ASYMPTOTE_NSI_CONFIGURATION_DIR}/AsymptoteInstallInfo.nsi
)

set(ASY_INSTALL_DIRECTORY build-${ASY_VERSION})

set(BUILD_ASY_INSTALLER_SCRIPT ${ASY_WIN_RESOURCE_DIR}/build-asymptote-installer.py)
configure_file(
        ${ASY_WIN_RESOURCE_DIR}/build-asy-installer.ps1.in
        ${ASYMPTOTE_NSI_CONFIGURATION_DIR}/build-asy-installer.ps1
)

set(ASY_PRE_NSIS_COMPONENT_NAME asy-pre-nsis)
set(ASY_NSIS_INSTALL_ARGUMENT
        COMPONENT ${ASY_PRE_NSIS_COMPONENT_NAME}
        DESTINATION ${ASY_INSTALL_DIRECTORY}
)

set(ASY_NSIS_TARGET_EXAMPLES_INSTALL_ARGUMENT
        COMPONENT ${ASY_PRE_NSIS_COMPONENT_NAME}
        DESTINATION ${ASY_INSTALL_DIRECTORY}/examples
)


set(ASY_NSIS_INSTALL_RESOURCES_ARGUMENT
        COMPONENT ${ASY_PRE_NSIS_COMPONENT_NAME}
        DESTINATION .
)

# <build-root>/asy.exe -> <install-root>/asy.exe
install(TARGETS asy
        RUNTIME_DEPENDENCIES
        PRE_EXCLUDE_REGEXES "api-ms-" "ext-ms-"
        POST_EXCLUDE_REGEXES ".*system32/.*\\.dll"
        ${ASY_NSIS_INSTALL_ARGUMENT}
)

# <build-root>/base/*, <build-root>/examples -> <install-root>/
install(
        DIRECTORY ${ASY_BUILD_BASE_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/examples
        ${ASY_NSIS_INSTALL_ARGUMENT}
)

# extra doc files
install(
        FILES
        ${ASY_DOC_DIR}/latexusage.tex
        ${ASY_DOC_DIR}/externalprc.tex
        ${ASY_NSIS_TARGET_EXAMPLES_INSTALL_ARGUMENT}
)

install(
        DIRECTORY ${ASY_DOC_DIR}/
        ${ASY_NSIS_TARGET_EXAMPLES_INSTALL_ARGUMENT}
        FILES_MATCHING
            PATTERN "*.asy"
            PATTERN "*.csv"
            PATTERN "*.dat"
)

# resources files for installer + nsi files

install(
        FILES ${CMAKE_CURRENT_SOURCE_DIR}/LICENSE
        ${ASY_WIN_RESOURCE_DIR}/asy.ico
        ${ASY_WIN_RESOURCE_DIR}/asymptote.nsi
        ${ASYMPTOTE_NSI_CONFIGURATION_DIR}/AsymptoteInstallInfo.nsi
        ${ASYMPTOTE_NSI_CONFIGURATION_DIR}/build-asy-installer.ps1
        ${ASY_NSIS_INSTALL_RESOURCES_ARGUMENT}
)

install(
        DIRECTORY ${ASY_WIN_RESOURCE_DIR}/
        ${ASY_NSIS_INSTALL_RESOURCES_ARGUMENT}
        FILES_MATCHING PATTERN "*.nsh"
)

# if a component is not buildable
macro(action_if_component_not_buildable message)
    message(WARNING "Please ensure this issue is resolved before installing. Message: ${message}")
    if (ALLOW_PARTIAL_INSTALLATION)
        install(CODE "message(WARNING \"${message}\")" COMPONENT ${ASY_PRE_NSIS_COMPONENT_NAME})
    else()
        install(CODE "message(FATAL_ERROR \"${message}\")" COMPONENT ${ASY_PRE_NSIS_COMPONENT_NAME})
    endif()
endmacro()

# unfortuantely, we have to first call the "docgen" target manually
# this can also be called from asy-pre-nsis-targets, which includes asy-with-basefiles alongside docgen.
# this is a limitation of cmake currently (https://discourse.cmake.org/t/install-file-with-custom-target/2984/2)

if (ASY_TEX_BUILD_ROOT)
    add_dependencies(asy-pre-nsis-targets docgen)
endif()

macro(install_from_external_documentation_dir docfile_name)
    set(DOCFILE_LOCATION ${EXTERNAL_DOCUMENTATION_DIR}/${docfile_name})
    message(STATUS "Using external documentation file at ${DOCFILE_LOCATION}")

    if (NOT EXISTS ${DOCFILE_LOCATION})
        message(WARNING "${DOCFILE_LOCATION} not found.
Please ensure this file exists before running \"cmake --install\"."
        )
    endif()

    install(FILES ${DOCFILE_LOCATION} ${ASY_NSIS_INSTALL_ARGUMENT})
endmacro()


if (ASY_TEX_BUILD_ROOT)  # basic docgen possible
    install(
            FILES ${BASE_ASYMPTOTE_DOC_AND_TEX_FILES}
            ${ASY_NSIS_INSTALL_ARGUMENT}
    )
elseif(EXTERNAL_DOCUMENTATION_DIR)
    set(
            ASY_DOC_FILES_TO_COPY
            asymptote.sty
            asy-latex.pdf
            CAD.pdf
            TeXShopAndAsymptote.pdf
            asyRefCard.pdf
    )
    foreach(ASY_DOC_FILE ${ASY_DOC_FILES_TO_COPY})
        install_from_external_documentation_dir(${ASY_DOC_FILE})
    endforeach()
else()
    action_if_component_not_buildable("base asymptote documentation cannot be found and is not buildable")
endif()


# asymptote.pdf
if(ENABLE_ASYMPTOTE_PDF_DOCGEN)
    message(STATUS "Using asymptote.pdf from ${ASY_TEX_BUILD_ROOT}/asymptote.pdf")
    install(
            FILES ${ASY_TEX_BUILD_ROOT}/asymptote.pdf
            ${ASY_NSIS_INSTALL_ARGUMENT}
    )
elseif (EXTERNAL_DOCUMENTATION_DIR)
    install_from_external_documentation_dir(asymptote.pdf)
else()
    action_if_component_not_buildable("asymptote.pdf cannot be found and is not buildable")
endif()

# README files
install(
        FILES
            ${CMAKE_CURRENT_SOURCE_DIR}/LICENSE
            ${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.LESSER
            ${CMAKE_CURRENT_SOURCE_DIR}/README
            ${ASY_WIN_RESOURCE_DIR}/asy.ico
        ${ASY_NSIS_INSTALL_ARGUMENT}
)