# ---- Regex Gadget UI ----

#' @inheritParams regex_gadget
regexplain_gadget_ui <- function(text = NULL, pattern = NULL, start_page = "Text") {
  miniPage(
    shiny::includeCSS(system.file("styles", "groups.css", package = "regexplain")),
    shiny::includeCSS(system.file("styles", "gadget.css", package = "regexplain")),
    gadgetTitleBar(
      "RegExplain",
      right = miniTitleBarButton("done", "Send RegEx To Console", TRUE)
    ),
    miniTabstripPanel(
      selected = match.arg(start_page, c("Text", "RegEx", "Output", "Help")),
      # --- UI - Tab - Text ----
      miniTabPanel(
        "Text", icon = icon('file-text-o'),
        miniContentPanel(
          fillCol(
            textAreaInputAlt('text',
                             label = "Text to search or parse",
                             value = paste(text, collapse = "\n"),
                             resize = "both",
                             width = "100%",
                             height="90%",
                             placeholder = "Paste, enter, or edit your sample text here.")
          )
        )
      ),
      # ---- UI - Tab - Regex ----
      miniTabPanel(
        "RegEx", icon = icon('terminal'),
        miniContentPanel(
          fillCol(
            flex = c(1, 3),
            fillCol(
              flex = c(1, 1),
              fillRow(
                flex = c(6, 1),
                textInputCode('pattern', 'RegEx', width = "100%",
                              value = pattern,
                              placeholder = "Standard RegEx, e.g. \\w+_\\d{2,4}\\s+"),
                tags$div(style = "margin-top: 23px; margin-left:6px;",
                         actionButton("library_show", "Library", class = "btn-success"))
              ),
              checkboxGroupInput(
                'regex_options',
                label = HTML(
                  '<div style="font-size: 1.25rem;">',
                  'Option Groups: ',
                  '<span style="color: #337ab7;">RegExplain</span>,',
                  '<span style="color: #5cb85c;">All</span>, ',
                  '<span style="color: #f0ad4e;">Base only</span>',
                  '</div>'
                ),
                inline = TRUE,
                width = "90%",
                choiceValues = list(
                  "global",
                  "text_break_lines",
                  "ignore.case",
                  "fixed",
                  "perl",
                  "useBytes"),
                choiceNames = list(
                  HTML('<span style="color: #337ab7;">Global</span>'),
                  HTML('<span style="color: #337ab7;">Break Lines</span>'),
                  HTML('<span style="color: #5cb85c;">Ignore Case</span>'),
                  HTML('<span style="color: #5cb85c;">Fixed/Literal</span>'),
                  HTML('<span style="color: #f0ad4e;">Perl Style</span>'),
                  HTML('<span style="color: #f0ad4e;">Use Bytes</span>')),
                selected = c('text_break_lines', 'perl')
              )
            ),
            tags$div(
              class = "gadget-result",
              style = "overflow-y: scroll; height: 100%;",
              htmlOutput('result')
            )
          )
        )
      ),
      # ---- UI - Tab - Output ----
      miniTabPanel(
        "Output", icon = icon("table"),
        miniContentPanel(
          fillCol(
            flex = c(1, 3),
            inputPanel(
              tags$div(
                width = "100%;",
                selectInput('regexFn', label = 'Apply Function',
                            choices = regexFn_choices),
                tags$span(class = "help-block",
                          style = "font-size:1.25rem; margin-top:-10px; margin-bottom:0px; margin-left:4px;",
                          "Adjust options in RegEx tab")
              ),
              uiOutput("output_sub")
            ),
            # verbatimTextOutput('output_result', placeholder = TRUE)
            tags$pre(
              id = "output_result",
              class = "shiny-text-output",
              style = "overflow-y: scroll; height: 100%;"
            )
          )
        )
      ),
      # ---- UI - Tab - Help ----
      miniTabPanel(
        "Help", icon = icon("support"),
        generate_help_ui(cheatsheet_only = FALSE)
      )
    )
  )
}