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! Copyright (c) 2020 Jeffrey Armstrong <jeff@rainbow-100.com>
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in
! all copies or substantial portions of the Software.
!
! The Software shall be used for Good, not Evil.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.

module internal_links
implicit none

    private
    public::internal_url, handle_internal_url

    character(*), parameter::internal_url = "lr87://"

contains

    function handle_internal_url(url, unit_number, faves)
    use favorite_handling
    implicit none

        character(*), intent(in)::url
        integer, intent(in)::unit_number
        type(favorite), dimension(:), pointer, intent(inout)::faves

        logical::handle_internal_url
        character(80)::requested_operation

        handle_internal_url = .false.

        requested_operation = url(len(internal_url)+1:len_trim(url))

        if(trim(requested_operation) == "menu") then
            call handle_menu(unit_number)
            handle_internal_url = .true.
        else if(trim(requested_operation) == "about") then
            call handle_about(unit_number)
            handle_internal_url = .true.
        else if(index(requested_operation, "favorites") == 1) then
            call handle_favorites(unit_number, trim(requested_operation), faves)
            handle_internal_url = .true.
#ifdef WINDOWS
        else if(index(requested_operation, "home") == 1) then
            call handle_home(unit_number)
            handle_internal_url = .true.
#endif
        end if

    end function handle_internal_url

    subroutine write_no_space(unit_number, string)
    implicit none

        character(*), intent(in)::string
        integer, intent(in)::unit_number
        character(10)::f
        integer::string_length

        string_length = len_trim(string)
        if(string_length < 10) then
            write(f, "(A2,I1,A1)") '(A', string_length,')'
        else if(string_length < 100) then
            write(f, "(A2,I2,A1)") '(A', string_length,')'
        else
            write(f, "(A2,I3,A1)") '(A', string_length,')'
        end if

        write(unit_number, f) string

    end subroutine write_no_space

    subroutine write_nonsense_status(unit_number)
    implicit none

        integer, intent(in)::unit_number

        rewind(unit_number)

        write(unit_number, '(I2, 1X, A11)') 20, "text/gemini"
        write(unit_number, *)

    end subroutine write_nonsense_status

    subroutine write_header(unit_number, title)
    implicit none

        character(*), intent(in)::title
        integer, intent(in)::unit_number

        call write_nonsense_status(unit_number)

        call write_no_space(unit_number, "# "//trim(title))

#ifdef WINDOWS
        write(unit_number, *)
        call write_no_space(unit_number, "=> lr87://home Start Page")
#endif

        write(unit_number, *)

        call write_no_space(unit_number, "=> lr87://favorites/date/newest Favorites Sorted by Date (Newest First)")
        call write_no_space(unit_number, "=> lr87://favorites/date/oldest Favorites Sorted by Date (Oldest First)")
        call write_no_space(unit_number, "=> lr87://favorites/alpha/ascending Favorites Sorted Alphabetically Ascending")
        call write_no_space(unit_number, "=> lr87://favorites/alpha/descending Favorites Sorted Alphabetically Descending")

        write(unit_number, *)

        call write_no_space(unit_number, "=> lr87://about About LR-87")

        write(unit_number, *)

    end subroutine write_header

    subroutine handle_menu(unit_number)
    implicit none

        integer, intent(in)::unit_number

        call write_header(unit_number, "Main Menu")

    end subroutine handle_menu

    subroutine handle_about(unit_number)
    use file_handling, only: end_indicator
    implicit none

        integer, intent(in)::unit_number

        call write_header(unit_number, "About")

        call write_no_space(unit_number, "## LR-87 - A Gemini Browser Written in Fortran")
        call write_no_space(unit_number, "Copyright 2020 Jeffrey Armstrong")
        call write_no_space(unit_number, "=> http://git.rainbow-100.com/cgit.cgi/LR-87/about/ LR-87 Web Home Page")
        call write_no_space(unit_number, "=> gemini://rainbow-100.com/software/lr87.gmi LR-87 Gemini Home Page")

        write(unit_number, *)

        call write_no_space(unit_number, "LR-87 uses the following technologies:")
        write(unit_number, *)
        call write_no_space(unit_number, "* OpenSSL from The OpenSSL Project")
        call write_no_space(unit_number, "* AppGraphics from Approximatrix, LLC on Windows")

        write(unit_number, *)

        call write_no_space(unit_number, "### License")
        call write_no_space(unit_number, "Permission is hereby granted, free of charge, to any "//&
                                         "person obtaining a copy of this software and associated "//&
                                         'documentation files (the "Software"), to deal in the '//&
                                         "Software without restriction, including without limitation "//&
                                         "the rights to use, copy, modify, merge, publish, distribute, "//&
                                         "sublicense, and/or sell copies of the Software, and to "//&
                                         "permit persons to whom the Software is furnished to do so, "//&
                                         "subject to the following conditions:")
        write(unit_number, *)
        call write_no_space(unit_number, "The above copyright notice and this permission notice shall "//&
                                         "be included in all copies or substantial portions of the Software.")
        write(unit_number, *)
        call write_no_space(unit_number, "The Software shall be used for Good, not Evil.")
        write(unit_number, *)
        call write_no_space(unit_number, 'THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, '//&
                                         "EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES "//&
                                         "OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND "//&
                                         "NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT "//&
                                         "HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, "//&
                                         "WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING "//&
                                         "FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR "//&
                                         "OTHER DEALINGS IN THE SOFTWARE. ")
        write(unit_number, *)
        call write_no_space(unit_number, end_indicator)

    end subroutine handle_about

    subroutine handle_favorites(unit_number, op, faves)
    use favorite_handling
    use file_handling, only: end_indicator
    implicit none

        character(*), intent(in)::op
        integer, intent(in)::unit_number
        type(favorite), dimension(:), pointer, intent(inout)::faves

        call write_header(unit_number, "Favorites")

        if(.not. associated(faves)) then
            call write_no_space(unit_number, "You currently have no favorites saved.")

        ! Alpha sort
        else
            if(index(op, "alpha") > 1) then
                call sort_alpha(faves, index(op, "descending") > 1)

            ! Date sort
            else
                call sort_added(faves, index(op, "latest") > 1)

            end if

            call write_favorites(unit_number, faves, skip_heading=.true.)

        end if

        call write_no_space(unit_number, end_indicator)

    end subroutine handle_favorites

    subroutine handle_home(unit_number)
    implicit none

        integer, intent(in)::unit_number

        call write_nonsense_status(unit_number)

        call write_no_space(unit_number, "# A Gemini Browser Written in Simply Fortran")

        write(unit_number, *)

        call write_no_space(unit_number, "LR-87 is a browser for the Gemini protocol, which is similar to the World Wide "// &
                                         "Web, only smaller and simpler.  This browser implements the much of the Gemini "// &
                                         "protocol, including browsing and user input.  On Microsoft Windows, the LR-87 "// &
                                         "browser uses Simply Fortran's AppGraphics package for all rendering.")

        write(unit_number, *)

        call write_no_space(unit_number, "Simply Fortran is a full-featured integrated development environment for the "// &
                                         "Fortran programming language.  It includes a complete, pre-configured Fortran " // &
                                         "compiler and tool suite in addition to the development environment, meaning there "// &
                                         "is nothing else for the user to configure and install.  Included with the package "// &
                                         "is the AppGraphics library, which enables the creation of full-featured graphical "// &
                                         "user interfaces written entirely in Fortran.  If you'd like to learn more about "// &
                                         "Simply Fortran, click the link below (which will open a web browser):")

        write(unit_number, *)

        call write_no_space(unit_number, "=> https://simplyfortran.com/?platform=windows Simply Fortran Home Page")

        write(unit_number, *)

        call write_no_space(unit_number, "## Sites to See in Gemini Space")

        write(unit_number, *)

        call write_no_space(unit_number, "=> gemini://gus.guru/ Gemini Universal Search - search all sites in Gemini")

        call write_no_space(unit_number, "=> gemini://rawtext.club:1965/~sloum/spacewalk.gmi Spacewalk - "// &
                                         "a list of recently updated Gemini sites")

        call write_no_space(unit_number, "=> gemini://rainbow-100.com/software/lr87.gmi LR-87 Site - "// &
                                         "the primary home of the LR-87 browser")

        call write_no_space(unit_number, "=> gemini://gemini.circumlunar.space/ More About the Gemini Protocol")

        call write_no_space(unit_number, "=> lr87://about More About the LR-87 Gemini browser")


    end subroutine handle_home

end module internal_links