# Copyright (c) 2019 Shapelets.io
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

FIND_PACKAGE(Sphinx QUIET)
FIND_PACKAGE(Dot QUIET)

PROJECT(KHIVALIB_DOC)

# Generating Doxygen Documentation
# check if Doxygen is installed, add a target to generate API documentation with Doxygen
FIND_PACKAGE(Doxygen QUIET)

IF(NOT DOXYGEN_FOUND OR DOT_EXECUTABLE STREQUAL "DOT_EXECUTABLE-NOTFOUND" OR SPHINX_EXECUTABLE STREQUAL "SPHINX_EXECUTABLE-NOTFOUND" )    
    SET(KHIVA_BUILD_DOCUMENTATION OFF)
    IF(NOT DOXYGEN_FOUND)
        MESSAGE(WARNING "Skipping the Khiva documentation build. Doxygen NOT FOUND")
    ENDIF()
    IF(DOT_EXECUTABLE STREQUAL "DOT_EXECUTABLE-NOTFOUND")
        MESSAGE(WARNING "Skipping the Khiva documentation build. Dot command of the GraphViz package NOT FOUND")
    ENDIF()
    IF(SPHINX_EXECUTABLE STREQUAL "SPHINX_EXECUTABLE-NOTFOUND")
        MESSAGE(WARNING "Skipping the Khiva documentation build. Sphinx NOT FOUND")
    ENDIF()
ENDIF()

IF(KHIVA_BUILD_DOCUMENTATION)
    SET(DOXYGEN_OUTPUT_DIR "${KHIVALIB_BASE_DIR}/build/doc/doxygen")

    # Generating Sphinx Documentation
    IF(NOT DEFINED SPHINX_THEME)
        SET(SPHINX_THEME default)
    ENDIF()
    
    IF(NOT DEFINED SPHINX_THEME_DIR)
        SET(SPHINX_THEME_DIR)
    ENDIF()
    
    # configured documentation tools and intermediate build results
    SET(BINARY_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/sphinx/source/_build")
    
    # Sphinx cache with pickled ReST documents
    SET(SPHINX_CACHE_DIR "${CMAKE_CURRENT_BINARY_DIR}/sphinx/source/_doctrees")
    
    # HTML output directory
    SET(SPHINX_HTML_DIR "${CMAKE_CURRENT_BINARY_DIR}/html")
    
    ADD_CUSTOM_TARGET(documentation ALL
        ${SPHINX_EXECUTABLE}
            -q -b html
            -c "${CMAKE_CURRENT_SOURCE_DIR}/sphinx/source/"
            -d "${SPHINX_CACHE_DIR}"
            "${CMAKE_CURRENT_SOURCE_DIR}/sphinx/source"
            "${SPHINX_HTML_DIR}"
        COMMENT "Building HTML documentation with Sphinx")

    # LaTeX output directory
    SET(SPHINX_LATEX_DIR "${CMAKE_CURRENT_BINARY_DIR}/latex")

    ADD_CUSTOM_TARGET(documentation_pdf
        ${SPHINX_EXECUTABLE}
            -q -b latex
            -c "${CMAKE_CURRENT_SOURCE_DIR}/sphinx/source/"
            -d "${SPHINX_CACHE_DIR}"
            "${CMAKE_CURRENT_SOURCE_DIR}/sphinx/source"
            "${SPHINX_LATEX_DIR}"
        COMMENT "Building HTML documentation with Sphinx")

    INSTALL(DIRECTORY ${SPHINX_HTML_DIR}
        DESTINATION ${KHIVA_INSTALL_DOC_DIR}
        COMPONENT documentation)
ENDIF()