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module instructions
implicit none

contains

    function parse_instructions(filename) result(j)
    use json_module
    implicit none
    
        type(json_file)::j
        character(*), intent(in)::filename
        
        call j%initialize()
        call j%load_file(filename=filename)
        
    end function parse_instructions
    
    subroutine destroy_instructions(j)
    use json_module
    implicit none
    
        type(json_file)::j
        call j%destroy()
    
    end subroutine destroy_instructions
    
    function work_available(j)
    use json_module
    implicit none
    
        class(json_file)::j
        logical::work_available
        
        character(len=:), allocatable::json_string_value
        logical::found
        
        call j%get("idle", json_string_value, found)
        
        work_available = .not. found
        
    end function work_available
    
    subroutine get_description(j, description)
    use json_module
    implicit none
    
        class(json_file)::j
        character(*), intent(out)::description
        character(len=:), allocatable::json_string_value
        logical::found
        
        call j%get("description", json_string_value, found)
        if(.not. found .or. .not. allocated(json_string_value)) then
            description = "(instructions)"
        else
            description = json_string_value
        end if
        
    end subroutine get_description
    
    function get_job_id(j) result(id)
    use json_module
    implicit none
    
        class(json_file)::j
        integer::id
        
        logical::found
        
        call j%get("id", id, found)
        if(.not. found) then
            id = -1
        end if

    end function get_job_id
    
    function get_task_count(j) result(n)
    use json_module
    implicit none
    
        class(json_file)::j
        integer::n
        
        type(json_value), pointer ::server
        logical::found
        character(3)::index_string
        n = 0
        
        found = .true.
        do while(found)
            n = n + 1
            write(index_string, '(I3)') n
            call j%get("tasks("//trim(index_string)//")", server, found)
        end do
        n = n - 1
        
    end function get_task_count
    
    pure subroutine task_component(i, component, label)
    implicit none
        
        integer, intent(in)::i
        character(*), intent(in)::component
        character(*), intent(out)::label
        
        write(label, '(A6,I3,A2)') "tasks(", i, ")."
        label = label//trim(component)
    
    end subroutine task_component
    
    function get_task_string(j, i, component, res) result(found)
    use json_module
    implicit none
        
        class(json_file)::j
        integer, intent(in)::i
        character(*), intent(in)::component
        character(*), intent(out)::res
        logical::found
        
        character(len=64)::label
        character(len=:), allocatable::json_string_value
        
        call task_component(i, component, label)
        
        call j%get(trim(label), json_string_value, found)
        
        if(allocated(json_string_value)) then
            res = json_string_value
        end if
        
    end function get_task_string
    
    function get_task_logical(j, i, component, res) result(found)
    use json_module
    implicit none
        
        class(json_file)::j
        integer, intent(in)::i
        character(*), intent(in)::component
        logical, intent(out)::res
        logical::found
        
        character(len=64)::label
        character(len=:), allocatable::json_string_value
        
        call task_component(i, component, label)
        
        call j%get(trim(label), res, found)

    end function get_task_logical
    
    subroutine get_task_name(j, i, description)
    use json_module
    implicit none
    
        class(json_file)::j
        character(*), intent(out)::description
        integer, intent(in)::i
        logical::found

        found = get_task_string(j, i, "name", description)
        
        if(.not. found) then
            write(description, '(A4, 1X, I3)') "Task", i
        end if
        
    end subroutine get_task_name
    
    subroutine get_task_operation(j, i, op)
    use json_module
    implicit none
    
        class(json_file)::j
        character(*), intent(out)::op
        integer, intent(in)::i
        logical::found

        found = get_task_string(j, i, "operation", op)
        
        if(.not. found) then
            op = " "
        end if
        
    end subroutine get_task_operation

    function perform_task(j, i, capture_filename) result(success)
    use json_module
    use tasks
    use utilities
    implicit none
    
        class(json_file)::j
        integer, intent(in)::i
        character(len=:), pointer, intent(out)::capture_filename
        logical::success
        
        character(32)::operation
        character(256)::url
        character(256)::filename
        character(256)::branch
        character(256)::cmd
        
        logical::destructive
        logical, dimension(4)::found
        
        call get_task_operation(j, i, operation)
        
        found = .true.
        capture_filename => null()
        
        if(trim(operation) == "upload") then
            found(1) = get_task_string(j, i, "url", url)
            found(2) = get_task_string(j, i, "filename", filename)
            if(.not. all(found,1)) then
                success = .false.
            else
                success = upload(url, filename)
            end if
        
        else if(trim(operation) == "download") then
            found(1) = get_task_string(j, i, "url", url)
            found(2) = get_task_string(j, i, "filename", filename)
            if(.not. all(found,1)) then
                success = .false.
            else
                success = download(url, filename)
            end if
        
        else if(trim(operation) == "git_update") then
            capture_filename => generate_temporary_filename()
        
            found(1) = get_task_string(j, i, "origin", url)
            found(2) = get_task_string(j, i, "branch", branch)
            found(3) = get_task_string(j, i, "directory", filename)
            found(4) = get_task_logical(j, i, "destructive", destructive)
            if(.not. found(4)) then
                destructive = .false.
                found(4) = .true.
            end if
            
            if(.not. all(found,1)) then
                success = .false.
            else
                success = git_update(url, branch, filename, destructive, capture_filename)
            end if
        
        
        else if(trim(operation) == "shell") then
            capture_filename => generate_temporary_filename()
        
            found(1) = get_task_string(j, i, "command", cmd)
            found(2) = get_task_string(j, i, "directory", filename)
            
            if(.not. all(found,1)) then
                success = .false.
            else
                success = shell(cmd, filename, capture_filename)
            end if
        
        else if(trim(operation) == "delete_tree") then
            found(1) = get_task_string(j, i, "directory", filename)
            
            if(.not. all(found,1)) then
                success = .false.
            else
                success = delete_tree(filename)
            end if
        
        end if
        
    end function perform_task
    
    subroutine perform_tasks(j)
    use json_module
    use talking
    use player_endpoints
    use utilities, only: delete_file
    implicit none
    
        class(json_file)::j
        
        integer::task_count
        integer::i
        integer::server_status
        logical::res
        integer::job_id
        character(len=:), pointer::captured_filename
        character(len=1024)::url
        
        task_count = get_task_count(j)
        job_id = get_job_id(j)
        
        do i = 1, task_count
            
            call get_status_url(job_id, i, url, status=STATUS_STARTING)
            server_status = request_to_ignored(url)
            
            res = perform_task(j, i, captured_filename)
        
            if(associated(captured_filename)) then
                if(res) then
                    call get_status_url(job_id, i, url, status=STATUS_COMPLETED)
                    server_status = request_to_ignored(url)
                    
                    call get_status_url(job_id, i, url, posting=.true.)
                    server_status = send_file(url, captured_filename)
                    
                    ! Get rid of the local file
                    call delete_file(captured_filename)
                    deallocate(captured_filename)
                    captured_filename => null()
                else
                    call get_status_url(job_id, i, url, status=STATUS_FAILED)
                    server_status = request_to_ignored(url)
                    exit
                endif
                
            else
                if(res) then
                    call get_status_url(job_id, i, url, status=STATUS_COMPLETED)
                    server_status = request_to_ignored(url)
                else
                    call get_status_url(job_id, i, url, status=STATUS_FAILED)
                    server_status = request_to_ignored(url)
                    exit
                endif
            end if
        end do
        
        call get_job_report_url(job_id, res, url)
        server_status = request_to_ignored(url)
        
    end subroutine perform_tasks
    
end module instructions