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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 config
implicit none

    character(*), parameter::TEMPLATE_DIRECTORY_VARIABLE = "template-directory"
    character(1024)::template_directory
    
    character(*), parameter::DATABASE_VARIABLE = "database"
    character(1024)::database_filename
    
    character(*), parameter::LOGFILE_VARIABLE = "log-filename"
    character(1024)::log_filename
    
    character(*), parameter::LOGLEVEL_VARIABLE = "log-level"
    integer::loglevel = 3
    
    character(*), parameter::PROJECT_NAME_VARIABLE = "project"
    character(32)::project

    character(*), parameter::DESCRIPTION_VARIABLE = "description"
    character(1024)::description
    
    character(*), parameter::PUBLIC_CERT_VARIABLE = "public-cert"
    character(1024)::pubcert
    
    character(*), parameter::PRIVATE_CERT_VARIABLE = "private-cert"
    character(1024)::privcert
    
    character(*), parameter::RELEASE_DIRECTORY_VARIABLE = "release-directory"
    character(1024)::release_dir
    
    character(*), parameter::UPLOAD_DIRECTORY_VARIABLE = "upload-directory"
    character(1024)::upload_dir
    
    character(*), parameter::RESULTS_DIRECTORY_VARIABLE = "results-directory"
    character(1024)::results_dir
    
    character(*), parameter::STATIC_DIRECTORY_VARIABLE = "static-directory"
    character(1024)::static_dir
    
    character(*), parameter::INSTRUCTIONS_DIRECTORY_VARIABLE = "instructions-directory"
    character(1024)::instructions_dir
    
    character(*), parameter::SCRIPT_DIRECTORY_VARIABLE = "script-directory"
    character(1024)::script_dir
    
    character(*), parameter::TEMP_DIRECTORY_VARIABLE = "temp-directory"
    character(1024)::temp_dir = "/tmp"
    
contains
    
    subroutine get_variable(str, v)
    implicit none
    
        character(*), intent(in)::str
        character(*), intent(out)::v
        
        integer::i
        
        v = " "
        
        i = index(str, '=')
        if(i > 0) then
            i = i - 1 ! Remove the equal sign
            v = adjustl(str(1:i))
        end if
    
    end subroutine get_variable
    
    subroutine get_value(str, v)
    implicit none
    
        character(*), intent(in)::str
        character(*), intent(out)::v
        
        integer::i,n
        
        v = " "
        
        i = index(str, '=')
        n = len_trim(str)
        if(i > 0) then
            v = adjustl(str(i+1:n))
        end if
    
    end subroutine get_value
    
    subroutine assign_config(cvariable, cvalue)
    use utilities, only: set_temporary_directory
    implicit none
    
        character(*), intent(in)::cvariable, cvalue
        
        if(cvariable == TEMPLATE_DIRECTORY_VARIABLE) then
            template_directory = cvalue
            
        else if(cvariable == DATABASE_VARIABLE) then
            database_filename = cvalue
        
        else if(cvariable == PROJECT_NAME_VARIABLE) then
            project = cvalue
        
        else if(cvariable == DESCRIPTION_VARIABLE) then
            description = cvalue
        
        else if(cvariable == PUBLIC_CERT_VARIABLE) then
            pubcert = cvalue
            
        else if(cvariable == PRIVATE_CERT_VARIABLE) then
            privcert = cvalue
        
        else if(cvariable == LOGFILE_VARIABLE) then
            log_filename = cvalue
            
        else if(cvariable == RELEASE_DIRECTORY_VARIABLE) then
            release_dir = cvalue
            
        else if(cvariable == UPLOAD_DIRECTORY_VARIABLE) then
            upload_dir = cvalue
            
        else if(cvariable == RESULTS_DIRECTORY_VARIABLE) then
            results_dir = cvalue
            
        else if(cvariable == STATIC_DIRECTORY_VARIABLE) then
            static_dir = cvalue
            
        else if(cvariable == SCRIPT_DIRECTORY_VARIABLE) then
            script_dir = cvalue
            
        else if(cvariable == INSTRUCTIONS_DIRECTORY_VARIABLE) then
            instructions_dir = cvalue
        
        else if(cvariable == LOGLEVEL_VARIABLE) then
            read(cvalue, '(I3)') loglevel
            
        else if(cvariable == TEMP_DIRECTORY_VARIABLE) then
            call set_temporary_directory(cvalue)
            
        end if
        
    end subroutine assign_config
    
    subroutine load_configuration(filename)
    implicit none
        
        character(*), intent(in)::filename
        integer::unit_number, istatus
        character(1024)::line, cvalue
        character(64)::cvariable
        
        open(newunit=unit_number, file=trim(filename), status='old', &
             action="read", iostat=istatus)
             
        read(unit_number, '(A)', iostat=istatus) line
        do while(istatus == 0)
            
            if(len_trim(line) > 0 .and. line(1:1) /= '#') then
            
                call get_variable(line, cvariable)
                call get_value(line, cvalue)

                call assign_config(trim(cvariable), trim(cvalue))
            
            end if
            
            read(unit_number, '(A)', iostat=istatus) line
        end do
             
        close(unit_number)
        
    end subroutine load_configuration
    
    subroutine template_filepath(x, res)
    use utilities, only: combine_paths
    implicit none
    
        character(*), intent(in)::x
        character(*), intent(out)::res
    
        call combine_paths(template_directory, x, res)
        
    end subroutine template_filepath
    
end module config