#' Plugin module for editing board stacks
#'
#' Logic and user experience for editing stack attributes such as stack names
#' can be customized or enhanced by providing an alternate version of this
#' plugin. The default implementation only handles stack names, but if further
#' (editable) stack attributes are to be introduced, corresponding UI and logic
#' can be included here. In addition to stack names, this default
#' implementation provides UI for removing the current stack.
#'
#' @param server,ui Server/UI for the plugin module
#'
#' @return A plugin container inheriting from `edit_stack` is returned by
#' `edit_stack()`, while the UI component (e.g. `edit_stack_ui()`) is
#' expected to return shiny UI (i.e. [shiny::tagList()]) and the server
#' component (i.e. `edit_stack_server()`) is expected to return `NULL`.
#'
#' @export
edit_stack <- function(server = edit_stack_server, ui = edit_stack_ui) {
  new_plugin(server, ui, class = "edit_stack")
}

#' @param id Namespace ID
#' @param stack_id Stack ID
#' @param board Reactive values object containing board information
#' @param update Reactive value object to initiate board updates
#' @param ... Extra arguments passed from parent scope
#'
#' @rdname edit_stack
#' @export
edit_stack_server <- function(id, stack_id, board, update, ...) {
  moduleServer(
    id,
    function(input, output, session) {

      cur_name <- reactive(
        stack_name(board_stacks(board$board)[[stack_id]])
      )

      output$stack_name_out <- renderUI(
        bslib::tooltip(cur_name(), paste("Stack ID: ", stack_id))
      )

      observeEvent(
        cur_name(),
        updateTextInput(
          session,
          "stack_name_in",
          "Stack name",
          cur_name()
        )
      )

      observeEvent(
        input$stack_name_in,
        {
          req(input$stack_name_in)
          if (!identical(cur_name(), input$stack_name_in)) {
            update(
              list(
                stacks = list(
                  mod = set_names(
                    list(list(name = input$stack_name_in)),
                    stack_id
                  )
                )
              )
            )
          }
        }
      )

      observeEvent(
        input$rm_stack,
        update(list(stacks = list(rm = stack_id)))
      )

      NULL
    }
  )
}

#' @param x Stack
#' @rdname edit_stack
#' @export
edit_stack_ui <- function(id, x, ...) {
  tagList(
    uiOutput(NS(id, "stack_name_out"), inline = TRUE),
    span(
      `data-bs-toggle` = "collapse",
      `data-bs-target` = "",
      bslib::popover(
        bsicons::bs_icon("gear"),
        textInput(
          NS(id, "stack_name_in"),
          "Stack name",
          stack_name(x)
        ),
        actionButton(
          NS(id, "rm_stack"),
          "Remove stack",
          icon = icon("circle-minus"),
          class = c("btn-danger", "mb-2")
        )
      )
    )
  )
}
