# frozen_string_literal: true

module UI
  module Windows
    module_function

    # Two-pane message reader: left=board list, right=messages of the selected
    # board. Press &New to compose, &Refresh to reload.
    def messages(app, services:)
      BBS::Windows::MasterDetail.open(app,
        title:         ' Message Boards ',
        items:         services[:boards].boards,
        item_label:    ->(b) { b.title },
        list_width:    20,
        empty_message: '  (no boards configured)',
        render_detail: ->(board, width) { board_lines(services, board, width) },
        actions: [
          { label: '&New',     align: :left, on_click: ->(window) {
              board = window.list_widget.selected_item
              compose_message(app, services: services, board: board,
                              on_posted: -> { window.reload_detail })
              :keep
            } },
          { label: '&Refresh', align: :left, on_click: ->(window) {
              window.reload_detail
              :keep
            } }
        ]
      )
    end

    def board_lines(services, board, width)
      msgs = services[:boards].messages(board.id, 100)
      return ["  (no messages on #{board.title} yet — press 'n' to start one)"] if msgs.empty?
      lines = []
      msgs.each do |m|
        head = "\e[2;37m#{m.timestamp}\e[0m  \e[1;33m#{m.username}\e[0m: "
        BBS::FrameBuffer.wrap_ansi(head + m.text.to_s, width - 1).each { |l| lines << l }
        lines << ''
      end
      lines
    end

    def compose_message(app, services:, board:, on_posted: nil)
      return BBS::Dialogs.message(app, 'Select a board first.', title: ' Compose ') unless board

      username = app.context[:username] || 'Anonymous'
      width    = [app.cols - 8, 70].min
      BBS::Windows::Form.open(app,
        title:        " Post to #{board.title} ",
        width:        width, height: 14,
        hint:         "From: #{username} — Ctrl-Enter sends",
        submit_label: '&Send',
        cancel_label: '&Cancel',
        fields: [
          { key: :body, type: :textarea, value: '', max_length: 1000 }
        ],
        on_submit: ->(values, form) {
          result = services[:boards].post(board.id, username, values[:body])
          if result == :empty
            form.error('Message cannot be empty.')
            :keep
          else
            on_posted&.call
            :close
          end
        }
      )
    end
  end
end