import PersistenceRegistry from '../base/redux/PersistenceRegistry';
import ReducerRegistry from '../base/redux/ReducerRegistry';

import {
    DISABLE_KEYBOARD_SHORTCUTS,
    ENABLE_KEYBOARD_SHORTCUTS,
    REGISTER_KEYBOARD_SHORTCUT,
    SET_CTRL_ALT_REACTION_SHORTCUTS_ENABLED,
    UNREGISTER_KEYBOARD_SHORTCUT
} from './actionTypes';
import { IKeyboardShortcutsState } from './types';

/**
 * The redux subtree of this feature.
 */
const STORE_NAME = 'features/keyboard-shortcuts';

const defaultState = {
    ctrlAltReactionShortcutsEnabled: true,
    enabled: true,
    shortcuts: new Map(),
    shortcutsHelp: new Map()
};

PersistenceRegistry.register(STORE_NAME, {
    ctrlAltReactionShortcutsEnabled: true,
    enabled: true
});

ReducerRegistry.register<IKeyboardShortcutsState>(STORE_NAME,
(state = defaultState, action): IKeyboardShortcutsState => {
    switch (action.type) {
    case ENABLE_KEYBOARD_SHORTCUTS:
        return {
            ...state,
            enabled: true
        };
    case DISABLE_KEYBOARD_SHORTCUTS:
        return {
            ...state,
            enabled: false
        };
    case SET_CTRL_ALT_REACTION_SHORTCUTS_ENABLED:
        return {
            ...state,
            ctrlAltReactionShortcutsEnabled: action.enabled
        };
    case REGISTER_KEYBOARD_SHORTCUT: {
        const { alt, character, ctrl } = action.shortcut;
        let shortcutKey = character;

        if (ctrl && alt) {
            shortcutKey = `-:${character}`;
        } else if (alt) {
            shortcutKey = `:${character}`;
        } else if (ctrl) {
            shortcutKey = `-${character}`;
        }

        return {
            ...state,
            shortcuts: new Map(state.shortcuts)
                .set(shortcutKey, action.shortcut),
            shortcutsHelp: action.shortcut.helpDescription
                ? new Map(state.shortcutsHelp)
                .set(action.shortcut.helpCharacter ?? shortcutKey, action.shortcut.helpDescription)
                : state.shortcutsHelp
        };
    }
    case UNREGISTER_KEYBOARD_SHORTCUT: {
        let shortcutKey = action.character;

        if (action.ctrl && action.alt) {
            shortcutKey = `-:${action.character}`;
        } else if (action.alt) {
            shortcutKey = `:${action.character}`;
        } else if (action.ctrl) {
            shortcutKey = `-${action.character}`;
        }
        const shortcuts = new Map(state.shortcuts);

        shortcuts.delete(shortcutKey);

        const shortcutsHelp = new Map(state.shortcutsHelp);

        shortcutsHelp.delete(shortcutKey);

        return {
            ...state,
            shortcuts,
            shortcutsHelp
        };
    }
    }

    return state;
});