local M = {}

M.STATE_LIST           = "list"
M.STATE_QUIT_CONFIRM   = "quit_confirm"
M.STATE_MODAL_CONFLICT = "modal_conflict"
M.EXIT                 = "exit"

function M.next(state, event)
    if state == M.STATE_LIST then
        if event == "esc"            then return M.STATE_QUIT_CONFIRM end
        if event == "open_conflict"  then return M.STATE_MODAL_CONFLICT end
    elseif state == M.STATE_QUIT_CONFIRM then
        if event == "esc"        then return M.STATE_LIST end
        if event == "enter"      then return M.EXIT end
        if event == "click_yes"  then return M.EXIT end
        if event == "click_no"   then return M.STATE_LIST end
    elseif state == M.STATE_MODAL_CONFLICT then
        if event == "esc"          then return M.STATE_LIST end
        if event == "cancel"       then return M.STATE_LIST end
        if event == "launch_anyway" then return M.STATE_LIST end -- side-effect
    end
    return state
end

return M