library(rjson)
library(shiny)
library(bslib)
library(leaflet)
library(sf)


crime_json <- fromJSON(file="data.json")

geo_bezirke <- st_read("geobezirke-parsed.json")
geo_bezirke <- st_transform(geo_bezirke, crs = 4326)

geo_stadtteile <- st_read("geostadtteile-parsed.json")
geo_stadtteile <- st_transform(geo_stadtteile, crs = 4326)

bezirke <- names(crime_json)

ui <- page_fillable(
  layout_columns(
    card(
      radioButtons(
        inputId = "rd_maptype",
        label = "Kartentyp",
        choices = c("Bezirke", "Stadtteile"),
        selected = "Bezirke"
      ),
      selectInput(
        inputId = "drp_bezirk",
        label = "Bezirk",
        choices = bezirke),
      selectInput(
        inputId = "drp_stadtteil",
        label = "Stadtteil",
        choices = NULL,
      )
    ),
    leafletOutput("hhmap"),
    card("Card rechts"),
    col_widths = c(3, 6, 3)
  )
)
server <- function(input, output, session){
  
  observeEvent(input$drp_bezirk, {
    sel_bezirk <- input$drp_bezirk
    
    if (sel_bezirk != "") {
      
      # Neue Auswahlmöglichkeiten bestimmen
      sel_stadtteile <- names(crime_json[[sel_bezirk]])
      
      # Zweites SelectInput-Feld aktualisieren
      updateSelectInput(
        session, 
        inputId = "drp_stadtteil", 
        choices = sel_stadtteile,
        selected = sel_stadtteile[1] # Wählt den ersten Eintrag vor
      )
      
    }
  })
  
  observeEvent(input$rd_maptype, {
    maptype <- input$rd_maptype
    mapproxy <- leafletProxy("hhmap")
    
    if (maptype == "Bezirke"){
      hideGroup(mapproxy, "layer_stadtteile")
      showGroup(mapproxy, "layer_bezirke")
    } 
    else {
      hideGroup(mapproxy, "layer_bezirke")
      showGroup(mapproxy, "layer_stadtteile")
      
    }
  })
  
  output$hhmap <- renderLeaflet({
    leaflet() %>%
      addProviderTiles(providers$CartoDB.Positron) %>%
      addPolygons(
        data = geo_bezirke,
        group = "layer_bezirke",
        color = "#7bb5ab",
        fillColor = "#bdf0e7",
        weight = 1,
        fillOpacity = 0.4,      # Polygon fill transparency
        highlightOptions = highlightOptions(
          color = "#103b57",
          weight = 4,
          bringToFront = TRUE
        ),
      ) %>%
      addPolygons(
        data = geo_stadtteile,
        group = "layer_stadtteile",
        color = "#7bb5ab",
        fillColor = "#bdf0e7",
        options = pathOptions(pane = "overlayPane"), # Use a leaflet option to ensure it's hidden
        weight = 1,
        fillOpacity = 0.4,      # Polygon fill transparency
        highlightOptions = highlightOptions(
          color = "#103b57",
          weight = 4,
          bringToFront = TRUE
        ),
      ) %>%
      
      setView(
        lng = 9.98716634776887,
        lat = 53.5488439196432,
        zoom = 11
      )
  })
}
options(shiny.host = '0.0.0.0')
options(shiny.port = 8888)
shinyApp(ui = ui, server = server)