library(shiny)
library(bslib)
library(dplyr)
library(ggplot2)
library(shinyAce)
library(shinyjs)

renderLogEntry <- function(entry){
  paste0(entry, " - ", date())
}

withConsoleRedirect <- function(containerId, expr) {
  txt <- capture.output(results <- expr, type = "output")
  if (length(txt) > 0) {
    appendTabsetPanel(Session, containerId, tabPanel("Console", verbatimTextOutput(paste0(txt, "\n"))))
  }
  results
}

ui <- shinyUI(
  tagList(
    tags$head(
      tags$link(rel = "stylesheet", type = "text/css", href = "styles.css"),
      tags$script(src = "script.js")
    ),
    fluidPage(
      useShinyjs(),
      div(
        id = "sidebar",
        sidebarPanel(
          h2("Opciones"),
          actionButton("theme_button", "Elige un tema"),
          selectInput('theme_code', 'Tema editor', choices = getAceThemes(), selected = 'ambiance'),
          downloadButton('save_code', 'Guardar codigo', icon = icon('save')),
          downloadButton('save_knit', 'Guardar knitr', icon = icon('save')),
          tags$a(href = "https://github.com/pablovanegas/runr", target = "_blank", class = "btn btn-default shiny-bound-input", "Ver Código Fuente")        
        )
      ),
      mainPanel(
        actionButton("toggleSidebar", "Opciones"),
        h1("Simple R"),
        div(class = "row",
          div(class = "col-md-12",
            h2("Tu codigo: "),
            verbatimTextOutput("log"),
            aceEditor("rmd", mode = "markdown", value = '```{r}
2*3
```',
                hotkeys = list(
                  open_chunk = 'Ctrl-Alt-I',
                  save_code = "Ctrl-S",
                  help_key = "F1"
                ),
                autoComplete = "live"
             ),
            actionButton("eval", "Run", icon = icon('play')),
            actionButton('clear', 'Clear', icon = icon('eraser')),
            actionButton("open_chunk", "Insert Chunk", icon = icon('plus'))
          )))
      ,
      div(
        class = "row",
        div(
          class = "col-md-12",
          h1("Resultado: "),
          htmlOutput("knitDoc")
        )
      )
    )
  )
)

server <- shinyServer(function(input, output, session) {
  
  hide("sidebar")
  
  observeEvent(input$theme_button, {
    showModal(modalDialog(title = "Elige un tema", shinythemes::themeSelector()))
  })

  observe({
    updateAceEditor(session,"rmd",
theme = input$theme_code
)
})

observeEvent(input$eval, {
HTML(knitr::knit2html(text = isolate(input$rmd), quiet = TRUE))
})

observeEvent(input$clear, {
updateAceEditor(session, 'rmd', value = '')
})

observeEvent(input$open_chunk, {
delay(3000, {
updateAceEditor(session, 'rmd', value = paste(isolate(input$rmd), "\n{r}\n\n\n", sep = ''))
})
})

observeEvent(input$rmd_open_chunk, {
delay(3000, {
old_val <- isolate(input$rmd)
new_chunk <- "\n{r}\n\n\n"
new_val <- paste(old_val, new_chunk, sep = "")
updateAceEditor(session, 'rmd', value = new_val)
})
})

observeEvent(input$rmd_help_key, {
showModal(modalDialog(
title = "Help Menu",
h2("Hot-Keys"),
"Use the following hot-keys:",
tags$ul(
tags$li("Ctrl-Alt-I: Open Chunk"),
tags$li("Ctrl-F: Find & Replace"),
tags$li("F1: Help Menu"),
tags$li("Ctrl-Z: Undo"),
tags$li("Ctrl-Y: Redo"),
)
))
})

output$save_code <- downloadHandler(
filename = function() {
paste("code-", Sys.Date(), ".Rmd", sep = "")
},
content = function(file) {
writeLines(input$rmd, file)
}
)

output$save_knit <- downloadHandler(
filename = function() {
paste("knit-", Sys.Date(), ".html", sep = "")
},
content = function(file) {
tmp_file <- tempfile(fileext = ".Rmd")
writeLines(input$rmd, tmp_file)
rmarkdown::render(input = tmp_file, output_file = file, output_format = "html_document")
}
)

observeEvent(input$toggleSidebar, {
toggle(session, "sidebar")
}
)
})

shinyApp(ui, server)