# module_buchungen.R

buchungenUI <- function(id) {
  ns <- NS(id)
  tagList(
    useShinyjs(), 
    h3("Hauptbuchungen"),
    reactableOutput(ns("buchungen_table")),
    hr(),
    h3("Details / Gegenbuchungen"),
    uiOutput(ns("details_table")) ,
    h3("Anhänge"),
    uiOutput(ns("attachments_ui")),
    fileInput(ns("anhang"), NULL, multiple = TRUE, 
      accept = c(".pdf", ".jpg", ".png", ".xlsx", ".docx"),
      width = "100%"),
    br(),
    actionBttn(ns("add_trans"), "Transaktion hinzu", size = "sm", style = "material-flat", color = "warning"),
    actionBttn(ns("del_trans"), "Transaktion Löschen", size = "sm", style = "material-flat", color = "danger"),
    actionBttn(ns("add_detail"), "Detail hinzu", size = "sm", style = "material-flat", color = "success"),
    
    
    
  )
}

buchungenServer <- function(id, conn, r_global) {
  moduleServer(id, function(input, output, session) {
    ns <- session$ns
    
    # ── Reactive Variablen ----
    postings_data      <- reactiveVal(read_buch_tabelle(conn))
    sel_details       <- reactiveVal(NULL)
    selected_trans_id  <- reactiveVal(NULL)
    reset_trigger <- reactiveVal(NULL)
    current_main_idx <- reactiveVal(NULL)

    

    
    # ── Filter ----
    aktiver_filter <- reactive(r_global$buchungen_filter)
    
    gefilterte_daten <- reactive({
      d <- postings_data()
      f <- aktiver_filter()
      if      (f == "alle")               d
      else if (f == "giro")               d |> filter(grepl("0130", account_name))
      else if (f == "monat")              d |> filter(
        floor_date(as.Date(valuta), "month") == floor_date(Sys.Date(), "month")
      )
      else if (startsWith(f, "contact:")) d |> filter(contact_id == as.integer(sub("contact:", "", f)))
      else if (startsWith(f, "project:")) d |> filter(project_id == as.integer(sub("project:", "", f)))
      else if (startsWith(f, "account:")) d |> filter(account_id == as.integer(sub("account:", "", f)))
      else d
    })
    
    
    # ── Haupttabelle rendern ----
    output$buchungen_table <- renderReactable({
      reset_trigger()
      f_reactable(
        daten            = gefilterte_daten(),
        coldefs          = coldef_entries_tabelle,
        selection        = "single",
        hoehe            = "60vh",
        filterable = TRUE,
      )
    })
    
    sel <- reactive(getReactableState("buchungen_table", "selected"))
    observeEvent(sel(), ignoreInit = T, {
      
      
      output$details_table <- renderUI({
        sel_details(read_buch_entries(conn,  gefilterte_daten()$entry_id[sel()]))
        rows <- lapply(1:nrow(sel_details()), function(ind) {
          fluidRow(class = "details-row",
            column(1, numericInput(ns("id"), label = NULL, width = "100%", value = sel_details()$id[ind])),
            column(2, dateInput(  ns("valuta"), label = NULL, width = "100%",value = sel_details()$valuta[ind])),
            column(3,
              selectizeInput(ns("account"), label = NULL,
                choices = get_account_choices(conn),
                selected = sel_details()$account_id[ind],
                width = "100%")
            ),
            column(3,
              selectizeInput(ns("projekt"), label = NULL,
                choices = get_project_choices(conn),
                selected = sel_details()$projekt_id[ind],
                width = "100%")
            ),
            column(2, numericInput(ns("betrag"), label = NULL, width = "100%",value = sel_details()$amount[ind]))
          )
        })
        
        tagList(
          rows)
      })
      
      
    })
    
    observe({
      req(sel_details())
      
      lapply(1:nrow(sel_details()), function(ind) {
        
        # Alle Input-IDs dieser Zeile
        ids <- c(paste0("id_",      ind),
          paste0("valuta_",  ind),
          paste0("betrag_",  ind),
          paste0("account_", ind),
          paste0("projekt_", ind))
        
        # Observer nur für diese Zeile
        observeEvent(
          lapply(ids, function(nm) input[[nm]]),  # Trigger: irgendein Input dieser Zeile
          ignoreInit = TRUE, {
            
            record <- list(
              id      = input[[paste0("id_",      ind)]],
              valuta  = input[[paste0("valuta_",  ind)]],
              betrag  = input[[paste0("betrag_",  ind)]],
              account = input[[paste0("account_", ind)]],
              projekt = input[[paste0("projekt_", ind)]]
            )
            
            print( record)
          }
        )
      })
    })
    
    
    # ── Anhänge ----
    # output$attachments_ui <- renderUI({
    #   req(selected_trans_id())
    #   att <- dbxSelect(conn, paste0(
    #     "SELECT * FROM attachments WHERE entry_id = ", selected_trans_id()
    #   ))
    #   if (nrow(att) == 0) return(p("Keine Anhänge vorhanden."))
    #   
    #   tagList(lapply(seq_len(nrow(att)), function(i) {
    #     ext      <- tools::file_ext(att$original_name[i])
    #     filename <- paste0("attachments/", att$id[i], ".", ext)
    #     
    #     observeEvent(input[[paste0("open_att_", att$id[i])]], {
    #       showModal(modalDialog(
    #         tags$iframe(src = filename, width = "100%", height = "600px", 
    #           style = "border:none;"),
    #         title     = att$original_name[i],
    #         size      = "l",
    #         easyClose = TRUE,
    #         footer    = modalButton("Schließen")
    #       ))
    #     }, ignoreInit = TRUE, once = FALSE)
    #     
    #     div(
    #       actionLink(ns(paste0("open_att_", att$id[i])), att$original_name[i]),
    #       actionLink(ns(paste0("del_att_", att$id[i])), "✕",
    #         style = "color:red; margin-left:8px;")
    #     )
    #   }))
    # })
  })
}