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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 query_utilities
implicit none

    type :: query_component
        character(len=:), pointer::key
        character(len=:), pointer::value
        
        contains
        
        procedure :: parse => query_component_parse
        procedure :: destroy => query_component_destroy
        procedure :: has_key => query_component_has_key
        
    end type query_component
    
    type :: query
    
        character(len=:), pointer::full
        
        type(query_component), dimension(:), pointer::components
        
        contains
        
        procedure :: init => query_init
        procedure :: destroy => query_destroy
        procedure :: component_count => query_component_count
        procedure :: get_value_by_index => get_query_value_from_index
        procedure :: get_value_by_key => get_query_value_from_key
        
        generic, public :: get_value => get_value_by_index, get_value_by_key
        
    end type query
    
contains

    subroutine query_component_parse(self, comptext)
    implicit none
    
        class(query_component), intent(out)::self
        character(*), intent(in)::comptext
        
        character(len=:), allocatable::decoded
        integer::i_in, i_out, i_equals, chnum
        
        allocate(character(len=len_trim(comptext)) :: decoded)
        
        i_equals = 0
        i_out = 1
        i_in = 1
        do while(i_in <= len_trim(comptext))
            if(comptext(i_in:i_in) /= '%') then
                decoded(i_out:i_out) = comptext(i_in:i_in)
                if(comptext(i_in:i_in) == '=') then
                    i_equals = i_out
                end if
                i_in = i_in + 1
            else
                i_in = i_in + 1
                read(comptext(i_in:i_in+1), '(Z2)') chnum
                decoded(i_out:i_out) = achar(chnum)
                i_in = i_in + 2
            end if
            i_out = i_out + 1
        end do
        
        if(i_equals == 0) then
            allocate(character(len=len_trim(decoded)) :: self%value)
            self%value = decoded
            self%key => null()
        else
            allocate(character(len=i_equals-1) :: self%key)
            self%key = decoded(1:i_equals-1)
            
            allocate(character(len=len_trim(decoded)-i_equals) :: self%value)
            self%value = decoded(i_equals+1:len_trim(decoded))
        end if
        
        deallocate(decoded)
        
    end subroutine query_component_parse
    
    elemental subroutine query_component_destroy(self)
    implicit none
    
        class(query_component), intent(inout)::self
        
        if(associated(self%key)) then
            deallocate(self%key)
        end if
        
        if(associated(self%value)) then
            deallocate(self%value)
        end if
        
    end subroutine query_component_destroy

    pure function query_component_has_key(self) result(res)
    implicit none
    
        class(query_component), intent(in)::self
        logical::res
        
        res = associated(self%key)
        
    end function query_component_has_key
    
    subroutine query_init(self, str)
    implicit none
        
        class(query), intent(out)::self
        character(len=*), intent(in)::str
        
        integer::ampersands, i, i_end, i_comp
        
        allocate(character(len=len_trim(str)) :: self%full)
        self%full = str
        
        ampersands = 0
        do i = 1, len(self%full)
            if(self%full(i:i) == '&') then
                ampersands = ampersands + 1
            end if
        end do
        
        allocate(self%components(ampersands + 1))
        
        ! Split and parse each component
        if(ampersands == 0) then
            call self%components(1)%parse(self%full)
        else
            i_comp = 1
            i = 1
            i_end = index(self%full, '&')
            do while(i_comp < ampersands + 1)
                call self%components(i_comp)%parse(self%full(i:i_end-1))
                i = i_end + 1
                do i_end = i, len_trim(self%full)
                    if(self%full(i_end:i_end) == '&') then
                        exit
                    end if
                end do
                i_comp = i_comp + 1
            end do
            call self%components(i_comp)%parse(self%full(i:i_end-1))
        end if
    
    end subroutine query_init
    
    pure function query_component_count(self)
    implicit none
        
        class(query), intent(in)::self
        integer::query_component_count
        
        if(associated(self%components)) then
            query_component_count = size(self%components)
        else
            query_component_count = 0
        end if
    
    end function query_component_count
    
    subroutine query_destroy(self)
    implicit none
    
        class(query), intent(inout)::self
        
        if(associated(self%full)) then
            deallocate(self%full)
            self%full => null()
        end if
        
        if(associated(self%components)) then
            call self%components%destroy()
            deallocate(self%components)
            self%components => null()
        end if
            
    end subroutine query_destroy
    
    function get_query_value_from_index(self, i) result(res)
    implicit none
    
        class(query), intent(in)::self
        integer, intent(in)::i
        character(len=:), pointer::res
        
        if(i <= self%component_count()) then
            res => self%components(i)%value
        end if
        
    end function get_query_value_from_index
        
    function get_query_value_from_key(self, k) result(res)
    implicit none
    
        class(query), intent(in)::self
        character(len=*), intent(in)::k
        character(len=:), pointer::res
        
        integer::i
        
        do i = 1, self%component_count()
            if(self%components(i)%has_key()) then
                if(self%components(i)%key == trim(k)) then
                    res => get_query_value_from_index(self, i)
                end if
            end if
        end do
    
    end function get_query_value_from_key
    
end module query_utilities