# module_buchungen.R

buchungenUI <- function(id) {
  ns <- NS(id)
  tagList(
    useShinyjs(), 
    h3("Hauptbuchungen"),
    fluidRow(
      column(8, reactableOutput(ns("buchungen_table"))),
      
      column(4, 
        selectizeInput(ns("contact"), label = "Kontakt", choices = get_contact_choices(conn), 
          selected = NA, width = "100%"),
        textAreaInput(ns("note"), label = "Verwendungszweck", value = NA, width = "100%"),
        h3("Dateien"),
        uiOutput(ns("attachments_ui")),
        fileInput(ns("anhang"), NULL, multiple = TRUE, 
          accept = c(".pdf", ".jpg", ".png", ".xlsx", ".docx"),
          width = "100%"),
        div(
          style = "display: flex; flex-direction: column; gap: 10px; align-items: flex-start;",
          
          actionBttn(ns("add_detail"), "Detail hinzu", 
            size = "sm", style = "material-flat", color = "default", block = TRUE),
          actionBttn(ns("del_detail"), "Detail Löschen", 
            size = "sm", style = "material-flat", color = "danger", block = TRUE),
          actionBttn(ns("add_trans"), "Transaktion hinzu", 
            size = "sm", style = "material-flat", color = "default", block = TRUE),
          
          actionBttn(ns("del_trans"), "Transaktion Löschen", 
            size = "sm", style = "material-flat", color = "danger", block = TRUE),
          actionBttn(ns("save_trans"), "Transaktion speichern", 
            size = "sm", style = "material-flat", color = "success", block = TRUE, icon = icon("floppy-disk")),
        )
      )
    ),
    
    hr(),
    h3("Details / Gegenbuchungen"),
    uiOutput(ns("details_table")) ,
    
    
    
  )
}

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$details_table <- renderUI({
        req(sel())
        # Daten laden
        df <- read_buch_entries(conn, gefilterte_daten()$entry_id[sel()])
        sel_details(df)
        
        rows <- lapply(1:nrow(df), function(ind) {
          fluidRow(class = "details-row",
            # HIER: Index an die ID hängen!
            column(1, numericInput(ns(paste0("id_", ind)), label = NULL, width = "100%", value = df$id[ind])),
            column(2, dateInput(ns(paste0("valuta_", ind)), label = NULL, width = "100%", value = df$valuta[ind])),
            column(3, selectizeInput(ns(paste0("account_", ind)), label = NULL, 
              choices = get_account_choices(conn), 
              selected = df$account_id[ind], width = "100%")),
            column(3, selectizeInput(ns(paste0("projekt_", ind)), label = NULL, 
              choices = get_project_choices(conn), 
              selected = df$projekt_id[ind], width = "100%")),
            column(2, numericInput(ns(paste0("betrag_", ind)), label = NULL, width = "100%", value = df$amount[ind]))
          )
        })
        tagList(rows)
      })
      
      
    })
    
    observeEvent(input$save_trans, {
      req(sel_details())
      n_rows <- nrow(sel_details())
      
      # Alle Zeilen in einer Liste sammeln
      all_records <- lapply(1:n_rows, function(ind) {
        data.frame(
          id         = as.integer(input[[paste0("id_", ind)]]),
          valuta     = as.Date(input[[paste0("valuta_", ind)]]),
          amount     = as.numeric(input[[paste0("betrag_", ind)]]),
          account_id = input[[paste0("account_", ind)]],
          projekt_id = input[[paste0("projekt_", ind)]],
          stringsAsFactors = FALSE
        )
      })
      
      # Zu einem großen Dataframe zusammenfügen
      final_df <- do.call(rbind, all_records)
      browser()
      
      # Datenbank-Update-Logik
      tryCatch({
        # Beispiel: Für jede Zeile ein Update ausführen
        for(i in 1:nrow(final_df)) {
          update_buchung_detail(conn, final_df[i, ]) # Deine DB-Funktion
        }
        
        showNotification("Daten erfolgreich gespeichert", type = "message")
        
        # Optional: Haupttabelle aktualisieren, falls sich Summen geändert haben
        # trigger_refresh(trigger_refresh() + 1)
        
      }, error = function(e) {
        showNotification(paste("Fehler beim Speichern:", e$message), type = "error")
      })
    })
    
    
    # ── Anhänge ----
    output$attachments_ui <- renderUI({
      req(sel_details())
      entry_id <- 
        dbxSelect(conn, paste0("SELECT entry_id FROM postings WHERE id=",  
          sel_details()$id[1])) %>% pull
      att <- dbxSelect(conn, paste0(
        "SELECT * FROM attachments WHERE entry_id = ", entry_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;")
        )
      }))
    })
  })
}