// src/tui/functions/form.rs
use crate::state::pages::form::FormState;
use crate::services::grpc_client::GrpcClient;
use crate::state::canvas_state::CanvasState;

pub async fn handle_action(
    action: &str,
    form_state: &mut FormState,
    grpc_client: &mut GrpcClient,
    current_position: &mut u64,
    total_count: u64,
    ideal_cursor_column: &mut usize,
) -> Result<String, Box<dyn std::error::Error>> {
    match action {
        "previous_entry" => {
            let new_position = current_position.saturating_sub(1);
            if new_position >= 1 {
                *current_position = new_position;
                let response = grpc_client.get_adresar_by_position(*current_position).await?;
                
                // Direct field assignments
                form_state.id = response.id;
                form_state.values = vec![
                    response.firma, response.kz, response.drc,
                    response.ulica, response.psc, response.mesto,
                    response.stat, response.banka, response.ucet,
                    response.skladm, response.ico, response.kontakt,
                    response.telefon, response.skladu, response.fax,
                ];
                
                let current_input = form_state.get_current_input();
                let max_cursor_pos = if !current_input.is_empty() {
                    current_input.len() - 1
                } else { 0 };
                form_state.current_cursor_pos = std::cmp::min(*ideal_cursor_column, max_cursor_pos);
                form_state.has_unsaved_changes = false;
                
                Ok(format!("Loaded form entry {}", *current_position))
            } else {
                Ok("Already at first form entry".into())
            }
        }
        "next_entry" => {
            if *current_position <= total_count {
                *current_position += 1;
                if *current_position <= total_count {
                    let response = grpc_client.get_adresar_by_position(*current_position).await?;
                    
                    // Direct field assignments
                    form_state.id = response.id;
                    form_state.values = vec![
                        response.firma, response.kz, response.drc,
                        response.ulica, response.psc, response.mesto,
                        response.stat, response.banka, response.ucet,
                        response.skladm, response.ico, response.kontakt,
                        response.telefon, response.skladu, response.fax,
                    ];
                    
                    let current_input = form_state.get_current_input();
                    let max_cursor_pos = if !current_input.is_empty() {
                        current_input.len() - 1
                    } else { 0 };
                    form_state.current_cursor_pos = std::cmp::min(*ideal_cursor_column, max_cursor_pos);
                    form_state.has_unsaved_changes = false;
                    
                    Ok(format!("Loaded form entry {}", *current_position))
                } else {
                    form_state.reset_to_empty();
                    form_state.current_field = 0;
                    form_state.current_cursor_pos = 0;
                    *ideal_cursor_column = 0;
                    Ok("New form entry mode".into())
                }
            } else {
                Ok("Already at last entry".into())
            }
        }
        _ => Err("Unknown form action".into())
    }
}