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import { disableExtension, enableExtension, extension_settings, extensionNames } from './extensions.js';
import { SlashCommand } from './slash-commands/SlashCommand.js';
import { ARGUMENT_TYPE, SlashCommandArgument, SlashCommandNamedArgument } from './slash-commands/SlashCommandArgument.js';
import { SlashCommandClosure } from './slash-commands/SlashCommandClosure.js';
import { commonEnumProviders } from './slash-commands/SlashCommandCommonEnumsProvider.js';
import { enumTypes, SlashCommandEnumValue } from './slash-commands/SlashCommandEnumValue.js';
import { SlashCommandParser } from './slash-commands/SlashCommandParser.js';
import { equalsIgnoreCaseAndAccents, isFalseBoolean, isTrueBoolean } from './utils.js';

/**
 * @param {'enable' | 'disable' | 'toggle'} action - The action to perform on the extension
 * @returns {(args: {[key: string]: string | SlashCommandClosure}, extensionName: string | SlashCommandClosure) => Promise<string>}
 */
function getExtensionActionCallback(action) {
    return async (args, extensionName) => {
        if (args?.reload instanceof SlashCommandClosure) throw new Error('\'reload\' argument cannot be a closure.');
        if (typeof extensionName !== 'string') throw new Error('Extension name must be a string. Closures or arrays are not allowed.');
        if (!extensionName) {
            toastr.warning(`Extension name must be provided as an argument to ${action} this extension.`);
            return '';
        }

        const reload = !isFalseBoolean(args?.reload);
        const internalExtensionName = findExtension(extensionName);
        if (!internalExtensionName) {
            toastr.warning(`Extension ${extensionName} does not exist.`);
            return '';
        }

        const isEnabled = !extension_settings.disabledExtensions.includes(internalExtensionName);

        if (action === 'enable' && isEnabled) {
            toastr.info(`Extension ${extensionName} is already enabled.`);
            return internalExtensionName;
        }

        if (action === 'disable' && !isEnabled) {
            toastr.info(`Extension ${extensionName} is already disabled.`);
            return internalExtensionName;
        }

        if (action === 'toggle') {
            action = isEnabled ? 'disable' : 'enable';
        }

        if (reload) {
            toastr.info(`${action.charAt(0).toUpperCase() + action.slice(1)}ing extension ${extensionName} and reloading...`);

            // Clear input, so it doesn't stay because the command didn't "finish",
            // and wait for a bit to both show the toast and let the clear bubble through.
            $('#send_textarea').val('')[0].dispatchEvent(new Event('input', { bubbles: true }));
            await new Promise(resolve => setTimeout(resolve, 100));
        }

        if (action === 'enable') {
            await enableExtension(internalExtensionName, reload);
        } else {
            await disableExtension(internalExtensionName, reload);
        }

        toastr.success(`Extension ${extensionName} ${action}d.`);


        console.info(`Extension ${action}ed: ${extensionName}`);
        if (!reload) {
            console.info('Reload not requested, so page needs to be reloaded manually for changes to take effect.');
        }

        return internalExtensionName;
    };
}

/**
 * Finds an extension by name, allowing omission of the "third-party/" prefix.
 *
 * @param {string} name - The name of the extension to find
 * @returns {string?} - The matched extension name or undefined if not found
 */
function findExtension(name) {
    return extensionNames.find(extName => {
        return equalsIgnoreCaseAndAccents(extName, name) || equalsIgnoreCaseAndAccents(extName, `third-party/${name}`);
    });
}

/**
 * Provides an array of SlashCommandEnumValue objects based on the extension names.
 * Each object contains the name of the extension and a description indicating if it is a third-party extension.
 *
 * @returns {SlashCommandEnumValue[]} An array of SlashCommandEnumValue objects
 */
const extensionNamesEnumProvider = () => extensionNames.map(name => {
    const isThirdParty = name.startsWith('third-party/');
    if (isThirdParty) name = name.slice('third-party/'.length);

    const description = isThirdParty ? 'third party extension' : null;

    return new SlashCommandEnumValue(name, description, !isThirdParty ? enumTypes.name : enumTypes.enum);
});

export function registerExtensionSlashCommands() {
    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'extension-enable',
        callback: getExtensionActionCallback('enable'),
        returns: 'The internal extension name',
        namedArgumentList: [
            SlashCommandNamedArgument.fromProps({
                name: 'reload',
                description: 'Whether to reload the page after enabling the extension',
                typeList: [ARGUMENT_TYPE.BOOLEAN],
                defaultValue: 'true',
                enumList: commonEnumProviders.boolean('trueFalse')(),
            }),
        ],
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Extension name',
                typeList: [ARGUMENT_TYPE.STRING],
                isRequired: true,
                enumProvider: extensionNamesEnumProvider,
                forceEnum: true,
            }),
        ],
        helpString: `
            <div>
                Enables a specified extension.
            </div>
            <div>
                By default, the page will be reloaded automatically, stopping any further commands.<br />
                If <code>reload=false</code> named argument is passed, the page will not be reloaded, and the extension will stay disabled until refreshed.
                The page either needs to be refreshed, or <code>/reload-page</code> has to be called.
            </div>
            <div>
                <strong>Example:</strong>
                <ul>
                    <li>
                        <pre><code class="language-stscript">/extension-enable Summarize</code></pre>
                    </li>
                </ul>
            </div>
        `,
    }));
    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'extension-disable',
        callback: getExtensionActionCallback('disable'),
        returns: 'The internal extension name',
        namedArgumentList: [
            SlashCommandNamedArgument.fromProps({
                name: 'reload',
                description: 'Whether to reload the page after disabling the extension',
                typeList: [ARGUMENT_TYPE.BOOLEAN],
                defaultValue: 'true',
                enumList: commonEnumProviders.boolean('trueFalse')(),
            }),
        ],
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Extension name',
                typeList: [ARGUMENT_TYPE.STRING],
                isRequired: true,
                enumProvider: extensionNamesEnumProvider,
                forceEnum: true,
            }),
        ],
        helpString: `
            <div>
                Disables a specified extension.
            </div>
            <div>
                By default, the page will be reloaded automatically, stopping any further commands.<br />
                If <code>reload=false</code> named argument is passed, the page will not be reloaded, and the extension will stay enabled until refreshed.
                The page either needs to be refreshed, or <code>/reload-page</code> has to be called.
            </div>
            <div>
                <strong>Example:</strong>
                <ul>
                    <li>
                        <pre><code class="language-stscript">/extension-disable Summarize</code></pre>
                    </li>
                </ul>
            </div>
        `,
    }));
    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'extension-toggle',
        callback: async (args, extensionName) => {
            if (args?.state instanceof SlashCommandClosure) throw new Error('\'state\' argument cannot be a closure.');
            if (typeof extensionName !== 'string') throw new Error('Extension name must be a string. Closures or arrays are not allowed.');

            const action = isTrueBoolean(args?.state) ? 'enable' :
                isFalseBoolean(args?.state) ? 'disable' :
                    'toggle';

            return await getExtensionActionCallback(action)(args, extensionName);
        },
        returns: 'The internal extension name',
        namedArgumentList: [
            SlashCommandNamedArgument.fromProps({
                name: 'reload',
                description: 'Whether to reload the page after toggling the extension',
                typeList: [ARGUMENT_TYPE.BOOLEAN],
                defaultValue: 'true',
                enumList: commonEnumProviders.boolean('trueFalse')(),
            }),
            SlashCommandNamedArgument.fromProps({
                name: 'state',
                description: 'Explicitly set the state of the extension (true to enable, false to disable). If not provided, the state will be toggled to the opposite of the current state.',
                typeList: [ARGUMENT_TYPE.BOOLEAN],
                enumList: commonEnumProviders.boolean('trueFalse')(),
            }),
        ],
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Extension name',
                typeList: [ARGUMENT_TYPE.STRING],
                isRequired: true,
                enumProvider: extensionNamesEnumProvider,
                forceEnum: true,
            }),
        ],
        helpString: `
            <div>
                Toggles the state of a specified extension.
            </div>
            <div>
                By default, the page will be reloaded automatically, stopping any further commands.<br />
                If <code>reload=false</code> named argument is passed, the page will not be reloaded, and the extension will stay in its current state until refreshed.
                The page either needs to be refreshed, or <code>/reload-page</code> has to be called.
            </div>
            <div>
                <strong>Example:</strong>
                <ul>
                    <li>
                        <pre><code class="language-stscript">/extension-toggle Summarize</code></pre>
                    </li>
                    <li>
                        <pre><code class="language-stscript">/extension-toggle Summarize state=true</code></pre>
                    </li>
                </ul>
            </div>
        `,
    }));
    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'extension-state',
        callback: async (_, extensionName) => {
            if (typeof extensionName !== 'string') throw new Error('Extension name must be a string. Closures or arrays are not allowed.');
            const internalExtensionName = findExtension(extensionName);
            if (!internalExtensionName) {
                toastr.warning(`Extension ${extensionName} does not exist.`);
                return '';
            }

            const isEnabled = !extension_settings.disabledExtensions.includes(internalExtensionName);
            return String(isEnabled);
        },
        returns: 'The state of the extension, whether it is enabled.',
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Extension name',
                typeList: [ARGUMENT_TYPE.STRING],
                isRequired: true,
                enumProvider: extensionNamesEnumProvider,
                forceEnum: true,
            }),
        ],
        helpString: `
            <div>
                Returns the state of a specified extension (true if enabled, false if disabled).
            </div>
            <div>
                <strong>Example:</strong>
                <ul>
                    <li>
                        <pre><code class="language-stscript">/extension-state Summarize</code></pre>
                    </li>
                </ul>
            </div>
        `,
    }));
    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'extension-exists',
        aliases: ['extension-installed'],
        callback: async (_, extensionName) => {
            if (typeof extensionName !== 'string') throw new Error('Extension name must be a string. Closures or arrays are not allowed.');
            const exists = findExtension(extensionName) !== undefined;
            return exists ? 'true' : 'false';
        },
        returns: 'Whether the extension exists and is installed.',
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Extension name',
                typeList: [ARGUMENT_TYPE.STRING],
                isRequired: true,
                enumProvider: extensionNamesEnumProvider,
            }),
        ],
        helpString: `
            <div>
                Checks if a specified extension exists.
            </div>
            <div>
                <strong>Example:</strong>
                <ul>
                    <li>
                        <pre><code class="language-stscript">/extension-exists SillyTavern-LALib</code></pre>
                    </li>
                </ul>
            </div>
        `,
    }));

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'reload-page',
        callback: async () => {
            toastr.info('Reloading the page...');
            location.reload();
            return '';
        },
        helpString: 'Reloads the current page. All further commands will not be processed.',
    }));
}