// src/modes/canvas/read_only.rs

use crate::config::binds::config::Config;
use crate::config::binds::key_sequences::KeySequenceTracker;
use crate::services::grpc_client::GrpcClient;
use crate::state::canvas_state::CanvasState;
use crate::state::pages::auth::AuthState;
use crate::state::pages::form::FormState;
use crate::functions::modes::read_only::{auth_ro, form_ro};
use crossterm::event::KeyEvent;

pub async fn handle_read_only_event(
    app_state: &crate::state::state::AppState,
    key: KeyEvent,
    config: &Config,
    form_state: &mut FormState,
    auth_state: &mut AuthState,
    key_sequence_tracker: &mut KeySequenceTracker,
    current_position: &mut u64,
    total_count: u64,
    grpc_client: &mut GrpcClient,
    command_message: &mut String,
    edit_mode_cooldown: &mut bool,
    ideal_cursor_column: &mut usize,
) -> Result<(bool, String), Box<dyn std::error::Error>> {
    if config.is_enter_edit_mode_before(key.code, key.modifiers) {
        *edit_mode_cooldown = true;
        *command_message = "Entering Edit mode".to_string();
        return Ok((false, command_message.clone()));
    }

    if config.is_enter_edit_mode_after(key.code, key.modifiers) {
        let (current_input, current_pos) = if app_state.ui.show_login {
            (
                auth_state.get_current_input(),
                auth_state.current_cursor_pos(),
            )
        } else {
            (
                form_state.get_current_input(),
                form_state.current_cursor_pos(),
            )
        };

        if !current_input.is_empty() && current_pos < current_input.len() {
            if app_state.ui.show_login {
                auth_state.set_current_cursor_pos(current_pos + 1);
                *ideal_cursor_column = auth_state.current_cursor_pos();
            } else {
                form_state.set_current_cursor_pos(current_pos + 1);
                *ideal_cursor_column = form_state.current_cursor_pos();
            }
        }
        *edit_mode_cooldown = true;
        *command_message = "Entering Edit mode (after cursor)".to_string();
        return Ok((false, command_message.clone()));
    }

    const CONTEXT_ACTIONS_FORM: &[&str] = &[
        "previous_entry",
        "next_entry",
    ];
    const CONTEXT_ACTIONS_LOGIN: &[&str] = &[
        "previous_entry",
        "next_entry",
    ];

    if key.modifiers.is_empty() {
        key_sequence_tracker.add_key(key.code);
        let sequence = key_sequence_tracker.get_sequence();

        if let Some(action) = config.matches_key_sequence_generalized(&sequence) {
            let result = if app_state.ui.show_form && CONTEXT_ACTIONS_FORM.contains(&action) {
                crate::tui::functions::form::handle_action(
                    action,
                    form_state,
                    grpc_client,
                    current_position,
                    total_count,
                    ideal_cursor_column,
                )
                .await?
            } else if app_state.ui.show_login && CONTEXT_ACTIONS_LOGIN.contains(&action) {
                crate::tui::functions::login::handle_action(
                    action,
                    auth_state,
                    ideal_cursor_column,
                )
                .await?
            } else if app_state.ui.show_login {
                auth_ro::execute_action(
                    action,
                    auth_state,
                    ideal_cursor_column,
                    key_sequence_tracker,
                    command_message,
                )
                .await?
            } else {
                form_ro::execute_action(
                    action,
                    form_state,
                    ideal_cursor_column,
                    key_sequence_tracker,
                    command_message,
                )
                .await?
            };
            key_sequence_tracker.reset();
            return Ok((false, result));
        }

        if config.is_key_sequence_prefix(&sequence) {
            return Ok((false, command_message.clone()));
        }

        if sequence.len() == 1 && !config.is_key_sequence_prefix(&sequence) {
            if let Some(action) = config.get_read_only_action_for_key(key.code, key.modifiers) {
                let result = if app_state.ui.show_form && CONTEXT_ACTIONS_FORM.contains(&action) {
                    crate::tui::functions::form::handle_action(
                        action,
                        form_state,
                        grpc_client,
                        current_position,
                        total_count,
                        ideal_cursor_column,
                    )
                    .await?
                } else if app_state.ui.show_login && CONTEXT_ACTIONS_LOGIN.contains(&action) {
                    crate::tui::functions::login::handle_action(
                        action,
                        auth_state,
                        ideal_cursor_column,
                    )
                    .await?
                } else if app_state.ui.show_login {
                    auth_ro::execute_action(
                        action,
                        auth_state,
                        ideal_cursor_column,
                        key_sequence_tracker,
                        command_message,
                    )
                    .await?
                } else {
                    form_ro::execute_action(
                        action,
                        form_state,
                        ideal_cursor_column,
                        key_sequence_tracker,
                        command_message,
                    )
                    .await?
                };
                key_sequence_tracker.reset();
                return Ok((false, result));
            }
        }
        key_sequence_tracker.reset();
    } else {
        key_sequence_tracker.reset();

        if let Some(action) = config.get_read_only_action_for_key(key.code, key.modifiers) {
            let result = if app_state.ui.show_form && CONTEXT_ACTIONS_FORM.contains(&action) {
                crate::tui::functions::form::handle_action(
                    action,
                    form_state,
                    grpc_client,
                    current_position,
                    total_count,
                    ideal_cursor_column,
                )
                .await?
            } else if app_state.ui.show_login && CONTEXT_ACTIONS_LOGIN.contains(&action) {
                crate::tui::functions::login::handle_action(
                    action,
                    auth_state,
                    ideal_cursor_column,
                )
                .await?
            } else if app_state.ui.show_login {
                auth_ro::execute_action(
                    action,
                    auth_state,
                    ideal_cursor_column,
                    key_sequence_tracker,
                    command_message,
                )
                .await?
            } else {
                form_ro::execute_action(
                    action,
                    form_state,
                    ideal_cursor_column,
                    key_sequence_tracker,
                    command_message,
                )
                .await?
            };
            return Ok((false, result));
        }
    }

    if !*edit_mode_cooldown {
        let default_key = "i".to_string();
        let edit_key = config
            .keybindings
            .read_only
            .get("enter_edit_mode_before")
            .and_then(|keys| keys.first())
            .map(|k| k.to_string())
            .unwrap_or(default_key);
        *command_message = format!("Read-only mode - press {} to edit", edit_key);
    }

    *edit_mode_cooldown = false;

    Ok((false, command_message.clone()))
}