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! Copyright (c) 2021 Approximatrix, LLC <support@approximatrix.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 tasks
implicit none

contains

    function shell(command, directory, capture_filename)
    use config
    use utilities
    implicit none
    
        logical::shell
        character(*), intent(in)::command
        character(*), intent(in)::directory
        character(*), intent(in)::capture_filename
        
        character(len=:), allocatable::task_directory
        
        integer::return_value, details_unit
        integer, dimension(8)::timedate_start, timedate_end
        
        shell = .false.
        
        if(is_absolute_path(directory)) then
            call chdir(directory)
        else
            allocate(character(len=(len_trim(directory) + len_trim(working_directory) + 1)) :: task_directory)
            call combine_paths(working_directory, directory, task_directory)
            call chdir(task_directory)
        end if
        
        call date_and_time(values=timedate_start)
        
        call execute_command_line(trim(command)//" 1>> "//trim(capture_filename)//" 2>&1", &
                                  wait=.true., exitstat=return_value)
        
        shell = (return_value == 0)
        
        ! Write out some final info
        open(newunit=details_unit, file=capture_filename, status="old", access="append")
        write(details_unit, *) repeat("=", 80)
        write(details_unit, '(1X, A25, I3)') "Task Completed with Code ", return_value
        
        call date_and_time(values=timedate_end)
        
        write(details_unit, '(1X, A8, 1X)', advance='no') "Started:"
        call write_date_and_time(details_unit, timedate_start)
        
        write(details_unit, '(1X, A8, 1X)', advance='no') "  Ended:"
        call write_date_and_time(details_unit, timedate_end)
        
        write(details_unit, *) "Command:"
        write(details_unit, *) "    "//trim(command)
        
        write(details_unit, *) "Working Directory:"
        if(allocated(task_directory)) then
            write(details_unit, *) "    "//trim(task_directory)
        else
            write(details_unit, *) "    "//trim(directory)
        end if
        
        write(details_unit, *) repeat("=", 80)
        close(details_unit)
        
        call chdir(working_directory)
        
        if(allocated(task_directory)) then
            deallocate(task_directory)
        end if
        
    end function shell

    function upload_glob(url, mask) result(res)
    use utilities
    implicit none
    
        logical::res
        character(*), intent(in)::url
        character(*), intent(in)::mask
        
        character(DIR_LIST_STRING_LENGTH), dimension(:), pointer::files
        logical, dimension(:), allocatable::statuses
        integer::i
        character(len=:), allocatable::dir, fullname
        
        ! We can cheat by using the get_files_in_directory function since it
        ! is merely calling ls/dir, which will resolve the glob
        files => get_files_in_directory(mask)
        
        !allocate(files(2))
        !files(1) = "/tmp/example/jagcdenc2.zip"
        !files(2) = "/tmp/example/jagenc2.zip"
        
        if(associated(files)) then
        
            allocate(character(len=len_trim(mask)) :: dir)
            allocate(character(len=len_trim(mask)+DIR_LIST_STRING_LENGTH+1) :: fullname)
            call path_from_file(mask, dir)
        
            allocate(statuses(size(files)))
            do i = 1, size(files)
            
                ! On some systems, we're getting subdirectories back...
                if(index(files(i), '/') + index(files(i), '\') > 0) then
                    fullname = files(i)
                else
                    call combine_paths(dir, files(i), fullname)
                end if
                
                statuses(i) = upload(url, fullname)
            end do
            
            res = all(statuses)
            
            deallocate(statuses)
            deallocate(files)
            deallocate(dir)
            deallocate(fullname)
        
        else
        
            res = .false.
            
        end if
    
    end function upload_glob

    function upload(url, source_filename) result(res)
    use config, only: token, captain
    use gemini_protocol, only: titan_post_url, STATUS_SUCCESS
    implicit none
    
        logical::res
        character(*), intent(in)::url
        character(*), intent(in)::source_filename
        
        character(len=:), allocatable::mod_url
        
        integer(kind=8)::file_size
        integer::unit_number, istatus, url_length, i
        logical::file_exists
        
        ! If we're here, we have a single filename to upload
        inquire(file=source_filename, size=file_size, exist=file_exists)
        if((.not. file_exists) .or. (file_size == 0)) then
            Print *, "File does not exist or size is 0: "//trim(source_filename), file_size
            res = .false.
            return
        end if
        
        Print *, "Opening for upload: "//trim(source_filename)

        open(newunit=unit_number, file=trim(source_filename), status='UNKNOWN', &
             access='STREAM', form='UNFORMATTED', iostat=istatus)
    
        if(index(url, "://") > 0) then
            ! Leave room for a possble filename
            url_length = len_trim(url) + len_trim(source_filename)
            
            allocate(character(len=url_length) :: mod_url)
            mod_url = url
        else
            ! Leave room for a possble filename
            url_length = len_trim(url) + len_trim(source_filename) + len_trim(captain) + 16
        
            allocate(character(len=url_length) :: mod_url)
            mod_url = "titan://"//trim(captain)
            if(url(1:1) == "/") then
                mod_url = trim(mod_url)//trim(url)
            else
                mod_url = trim(mod_url)//"/"//trim(url)
            end if
        end if
        
        ! If the URL ends in a slash, it's a folder, add the filename base.
        if(mod_url(len_trim(mod_url):len_trim(mod_url)) == "/") then
            i = max(index(source_filename, "/", back=.true.), index(source_filename, "\", back=.true.))
            if(i > 0) then
                mod_url = trim(mod_url)//source_filename(i+1:len_trim(source_filename))
            else
                mod_url = trim(mod_url)//trim(source_filename)
            end if
        end if
        
        if(istatus == 0) then
            Print *, "Writing "//trim(mod_url)
            istatus = titan_post_url(mod_url, unit_number, file_size, token)
            res = (istatus == STATUS_SUCCESS)
            close(unit_number)
        else
            res = .false.
        end if
        
        deallocate(mod_url)
        
    end function upload
    
    function download(url, destination_filename)
    use gemini_protocol, only: request_url, STATUS_SUCCESS
    use config, only: captain
    implicit none
    
        logical::download
        character(*), intent(in)::url
        character(*), intent(in)::destination_filename
        
        character(len=256)::mimetype
        
        character(len=:), allocatable::mod_url
        integer::url_length
        
        integer::unit_number, istatus
        
        if(index(url, "://") > 0) then
            allocate(character(len=len_trim(url)) :: mod_url)
            mod_url = url
        else
            url_length = len_trim(url) + len_trim(captain) + 16
            allocate(character(len=url_length) :: mod_url)
            mod_url = "gemini://"//trim(captain)
            if(url(1:1) == "/") then
                mod_url = trim(mod_url)//trim(url)
            else
                mod_url = trim(mod_url)//"/"//trim(url)
            end if
        end if
        
        open(newunit=unit_number, file=trim(destination_filename), status='UNKNOWN', &
             access='STREAM', iostat=istatus) ! , form='FORMATTED', 
        
        if(istatus == 0) then
            istatus = request_url(mod_url, unit_number, mimetype)
            download = (istatus == STATUS_SUCCESS)
            close(unit_number)
        else
            download = .false.
        end if
        
        deallocate(mod_url)
        
    end function download

    function git_update(origin, branch, directory, destructive, capture_filename)
    use config
    implicit none
    
        logical::git_update
        character(*), intent(in)::origin
        character(*), intent(in)::directory
        character(*), intent(in)::branch
        logical, intent(in)::destructive
        character(*), intent(in)::capture_filename
        
        logical::res
        integer::retval
        character(len=32)::options

        ! If we're working in destructive mode, just checkout the current head
        if(destructive) then
            res = delete_tree(directory)
            options = " --depth 1"
        else
            options = " "
        end if
        
        call execute_command_line("mkdir "//trim(directory), wait=.true., exitstat=retval)
        
        ! If Zero, there is no existing directory...
        if(retval == 0) then
            res = shell("git clone"//trim(options)//" "//trim(origin)//" "//trim(directory), working_directory, capture_filename)
            if(res) then
                res = shell("git submodule init", directory, capture_filename)
            end if
        else
            res = .true.
        end if
        
        ! Check that nothing went wrong so far...
        if(res) then
            res = shell("git checkout "//trim(branch), directory, capture_filename)
            if(res) then
                res = shell("git pull", directory, capture_filename)
                res = shell("git submodule update", directory, capture_filename)
            end if
        end if
        
        git_update = res
        
    end function git_update

    function delete_tree(directory)
    use config, only: working_directory
    use utilities
    implicit none
    
        logical::delete_tree
        character(*), intent(in)::directory
        character(len=:), allocatable::fulldir
        
        ! Only proceed in the working directory...
        ! Relative paths could still break this, but what can you do...
        if(is_absolute_path(directory)) then
            delete_tree = .false.
        else
            
            allocate(character(len=( len_trim(working_directory)+len_trim(directory)+1 )) :: fulldir)
            call combine_paths(working_directory, directory, fulldir)
            
            ! No spaces allowed.  Tough...
            if(index(fulldir, " ") /= 0) then
                delete_tree = .false.
            else
                delete_tree = remove_directory(fulldir, and_files=.true.)
            end if
            
            deallocate(fulldir)
            
        end if
    
    end function delete_tree

end module tasks