#
# api documentation
#
find_package(Doxygen)

# always check doc target
add_custom_target(doc ALL)

if(DOXYGEN_EXECUTABLE)
    option(DBUS_ENABLE_DOXYGEN_DOCS "build DOXYGEN documentation (requires Doxygen)" ON)
    add_auto_option(ENABLE_QT_HELP "build qt help documentation (requires qhelpgenerator(-qt5)); set INSTALL_QCH_DIR for custom qch installation path" AUTO)
endif()

if(DBUS_ENABLE_DOXYGEN_DOCS)
    set(top_srcdir ${PROJECT_SOURCE_DIR})
    set(top_builddir ${PROJECT_BINARY_DIR})
    if(WIN32)
        set(DBUS_GENERATE_MAN NO)
    else()
        set(DBUS_GENERATE_MAN YES)
    endif()
    if(NOT DEFINED INSTALL_QCH_DIR)
        set(INSTALL_QCH_DIR ${CMAKE_INSTALL_DATADIR}/doc/dbus)
    endif()
    find_program(QHELPGENERATOR_EXECUTABLE NAMES qhelpgenerator qhelpgenerator-qt5)
    check_auto_option(ENABLE_QT_HELP "Qt help" QHELPGENERATOR_EXECUTABLE "qhelpgenerator")
    if(ENABLE_QT_HELP AND QHELPGENERATOR_EXECUTABLE)
        message(STATUS "${QHELPGENERATOR_EXECUTABLE} found")
        set(DOXYGEN_GENERATE_QHP YES)
        set(DOXYGEN_QHG_LOCATION ${QHELPGENERATOR_EXECUTABLE})
        set(DOXYGEN_QCH_FILE ${CMAKE_CURRENT_BINARY_DIR}/api/qch/dbus-${VERSION}.qch)
        set(DBUS_ENABLE_QTHELP_DOCS ON PARENT_SCOPE)
        install(FILES ${DOXYGEN_QCH_FILE} DESTINATION ${INSTALL_QCH_DIR})
    else()
        set(DOXYGEN_GENERATE_QHP NO)
        set(DBUS_ENABLE_QTHELP_DOCS OFF PARENT_SCOPE)
    endif()
    configure_file(../Doxyfile.in ${PROJECT_BINARY_DIR}/Doxyfile )
    file(GLOB dbus_files "${PROJECT_SOURCE_DIR}/dbus/*.[ch]*")
    add_custom_command(
        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/doxygen.stamp
        DEPENDS ${PROJECT_SOURCE_DIR}/Doxyfile.in  ${PROJECT_BINARY_DIR}/Doxyfile ${dbus_files}
        COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/api/html
        COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/api/man
        COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/api/xml
        COMMAND ${DOXYGEN_EXECUTABLE} ${PROJECT_BINARY_DIR}/Doxyfile
        COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/doxygen.stamp
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
        COMMENT "Generating API documentation with Doxygen"
    )
    add_custom_target(apidoc
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/doxygen.stamp
    )
    add_dependencies(doc apidoc)
    install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/api/html/ DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/dbus/api)
endif()

find_program(XSLTPROC_EXECUTABLE xsltproc)
if(XSLTPROC_EXECUTABLE)
    message(STATUS "${XSLTPROC_EXECUTABLE} found")
    set(DBUS_HAVE_XSLTPROC 1)
endif()

if(DBUS_HAVE_XSLTPROC AND DBUS_ENABLE_DOXYGEN_DOCS)
    add_custom_command(
        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/dbus.devhelp2
        COMMAND ${XSLTPROC_EXECUTABLE}
            -o ${CMAKE_CURRENT_BINARY_DIR}/dbus.devhelp2
            ${CMAKE_CURRENT_SOURCE_DIR}/doxygen_to_devhelp.xsl
            ${CMAKE_CURRENT_BINARY_DIR}/api/xml/index.xml
        DEPENDS
            ${CMAKE_CURRENT_SOURCE_DIR}/doxygen_to_devhelp.xsl
            ${CMAKE_CURRENT_BINARY_DIR}/doxygen.stamp
    )
    add_custom_target(devhelp2
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/dbus.devhelp2
    )
    add_dependencies(doc devhelp2)
    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/dbus.devhelp2 DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/dbus)
endif()

#
# docbook based documentation
# 
find_package(DocBookXSL)

if(DOCBOOKXSL_DIR AND XSLTPROC_EXECUTABLE)
    option(DBUS_ENABLE_XML_DOCS "build XML documentation" ON)
    set(DBUS_XML_DOCS_ENABLED 1)
    message(STATUS "xsltproc docbook generator found")
    add_custom_target(xmldoc)
    add_dependencies(doc xmldoc)
endif()

if(DBUS_ENABLE_XML_DOCS)

#
# generate output file from docbook xml source template or file
#
# @param _target            base name for the generated file
# @param TEMPLATE <file>    docbook xml template file to generated the output from
#                           (with '@var@' variable substitution)
# @param SOURCE <file>      alternative docbook xml file to generated the output from
#                           (without variable substitution)
# @param MAN_CATEGORY <cat> category for creating man pages (also used for html output)
# @param FORMATS <formats>  list with output formats to generate ('html' and/or 'man')
#
macro(add_docbook _target)
    set(options)
    set(oneValueArgs SOURCE TEMPLATE MAN_CATEGORY)
    set(multiValueArgs FORMATS)
    cmake_parse_arguments(ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    foreach(_format ${ARGS_FORMATS})
        if(ARGS_TEMPLATE)
            set(_xmlfile "${CMAKE_CURRENT_BINARY_DIR}/${_target}-${_format}.xml")
            get_filename_component(_infile ${ARGS_TEMPLATE} ABSOLUTE)
            configure_file(${_infile} ${_xmlfile})
        else()
            get_filename_component(_infile ${ARGS_SOURCE} ABSOLUTE)
            set(_xmlfile ${_infile})
        endif()
        if(${_format} STREQUAL "man")
            set(_outname "${_target}.${ARGS_MAN_CATEGORY}")
            set(STYLESHEET "${DOCBOOKXSL_DIR}/manpages/docbook.xsl")
            set(INSTALL_DIR ${CMAKE_INSTALL_DATADIR}/man/man${ARGS_MAN_CATEGORY})
        else()
            set(_outname "${_target}.${ARGS_MAN_CATEGORY}.html")
            set(STYLESHEET "${DOCBOOKXSL_DIR}/html/docbook.xsl")
            set(INSTALL_DIR ${CMAKE_INSTALL_DATADIR}/doc/dbus)
        endif()
        set(_outfile ${CMAKE_CURRENT_BINARY_DIR}/${_outname})
        add_custom_command(
            OUTPUT ${_outfile}
            COMMAND ${XSLTPROC_EXECUTABLE} --output ${_outfile} --nonet --xinclude  --param passivetex.extensions '1' --param generate.consistent.ids '1' ${STYLESHEET} ${_xmlfile}
            DEPENDS ${XSLTPROC_EXECUTABLE} ${_xmlfile}
            WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
        )
        add_custom_target(xmldoc-${_outname} DEPENDS ${_outfile})
        add_dependencies(xmldoc xmldoc-${_outname})
        install(FILES ${_outfile} DESTINATION ${INSTALL_DIR})
    endforeach()
endmacro()

### copy tests to builddir so that generated tests and static tests 
### are all in one place.
### todo how to add more filetypes 
macro(COPYDIR _src _type)
    foreach(FILE_TYPE ${_type})
        foreach(DIR ${_src})
            file(GLOB FILES "${DIR}/${FILE_TYPE}" )
            file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/${DIR})
            foreach(FILE ${FILES})
                get_filename_component(FILENAME ${FILE} NAME)
                set(TARGET ${PROJECT_BINARY_DIR}/${DIR}/${FILENAME})
                configure_file(${FILE} ${TARGET} COPYONLY)
                if(CONFIG_VERBOSE)
                    message("FROM: ${FILE}\nTO: ${TARGET}\n")
                endif()
            endforeach()
        endforeach()
    endforeach()
endmacro()

# copy source files from doc directory into associated binary directory
# which is required to run generated xml docs from build directory
COPYDIR(doc *.png)
COPYDIR(doc *.svg)

# setup variables used in docbook templates
set(EXPANDED_SYSCONFDIR ${CMAKE_INSTALL_FULL_SYSCONFDIR})
set(EXPANDED_DATADIR ${CMAKE_INSTALL_FULL_DATADIR})

set(formats html)
if(UNIX)
    list(APPEND formats man)
endif()
# generate docbook output
add_docbook(dbus-cleanup-sockets TEMPLATE dbus-cleanup-sockets.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-daemon TEMPLATE dbus-daemon.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-launch TEMPLATE dbus-launch.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-monitor TEMPLATE dbus-monitor.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-run-session TEMPLATE dbus-run-session.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-send TEMPLATE dbus-send.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-test-tool TEMPLATE dbus-test-tool.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-uuidgen TEMPLATE dbus-uuidgen.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})
add_docbook(dbus-update-activation-environment TEMPLATE dbus-update-activation-environment.1.xml.in MAN_CATEGORY 1 FORMATS ${formats})

#
# handle html index file
#
configure_file(index.html.in ${CMAKE_CURRENT_BINARY_DIR}/index.html)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/index.html DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/dbus)

#
# misc files
#
set(DTD_DATA
    diagram.png
    diagram.svg
)

install(FILES ${DTD_DATA} DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/dbus)

set(DOC_DATA
    system-activation.txt
)

install(FILES ${DOC_DATA} DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/dbus)

set(DBUS_DTD_DIR "${CMAKE_INSTALL_DATADIR}/xml/dbus-1" CACHE STRING  "Directory for installing DTD files")
set(DBUS_XML_CATALOG_DIR "${DBUS_DTD_DIR}" CACHE STRING  "Directory for installing XML catalog file")

set(EXTRA_DIST
    busconfig.dtd
    introspect.dtd
    introspect.xsl
)

install(FILES ${EXTRA_DIST} DESTINATION ${DBUS_DTD_DIR})

configure_file(
  "${CMAKE_CURRENT_SOURCE_DIR}/catalog.xml.in"
  "${CMAKE_CURRENT_BINARY_DIR}/catalog.xml"
  @ONLY)

install(FILES "${CMAKE_CURRENT_BINARY_DIR}/catalog.xml" DESTINATION ${DBUS_XML_CATALOG_DIR})

endif()