import { event_types, eventSource, main_api, saveSettingsDebounced } from '../../../script.js';
import { extension_settings, renderExtensionTemplateAsync } from '../../extensions.js';
import { callGenericPopup, Popup, POPUP_TYPE } from '../../popup.js';
import { SlashCommand } from '../../slash-commands/SlashCommand.js';
import { SlashCommandAbortController } from '../../slash-commands/SlashCommandAbortController.js';
import { ARGUMENT_TYPE, SlashCommandArgument, SlashCommandNamedArgument } from '../../slash-commands/SlashCommandArgument.js';
import { commonEnumProviders, enumIcons } from '../../slash-commands/SlashCommandCommonEnumsProvider.js';
import { SlashCommandDebugController } from '../../slash-commands/SlashCommandDebugController.js';
import { enumTypes, SlashCommandEnumValue } from '../../slash-commands/SlashCommandEnumValue.js';
import { SlashCommandParser } from '../../slash-commands/SlashCommandParser.js';
import { SlashCommandScope } from '../../slash-commands/SlashCommandScope.js';
import { collapseSpaces, getUniqueName, isFalseBoolean, uuidv4 } from '../../utils.js';

const MODULE_NAME = 'connection-manager';
const NONE = '<None>';

const DEFAULT_SETTINGS = {
    profiles: [],
    selectedProfile: null,
};

const CC_COMMANDS = [
    'api',
    'preset',
    // Do not fix; CC needs to set the API twice because it could be overridden by the preset
    'api',
    'api-url',
    'model',
    'proxy',
];

const TC_COMMANDS = [
    'api',
    'preset',
    'api-url',
    'model',
    'instruct',
    'context',
    'instruct-state',
    'tokenizer',
];

const FANCY_NAMES = {
    'api': 'API',
    'api-url': 'Server URL',
    'preset': 'Settings Preset',
    'model': 'Model',
    'proxy': 'Proxy Preset',
    'instruct-state': 'Instruct Mode',
    'instruct': 'Instruct Template',
    'context': 'Context Template',
    'tokenizer': 'Tokenizer',
};

/**
 * A wrapper for the connection manager spinner.
 */
class ConnectionManagerSpinner {
    /**
     * @type {AbortController[]}
     */
    static abortControllers = [];

    /** @type {HTMLElement} */
    spinnerElement;

    /** @type {AbortController} */
    abortController = new AbortController();

    constructor() {
        // @ts-ignore
        this.spinnerElement = document.getElementById('connection_profile_spinner');
        this.abortController = new AbortController();
    }

    start() {
        ConnectionManagerSpinner.abortControllers.push(this.abortController);
        this.spinnerElement.classList.remove('hidden');
    }

    stop() {
        this.spinnerElement.classList.add('hidden');
    }

    isAborted() {
        return this.abortController.signal.aborted;
    }

    static abort() {
        for (const controller of ConnectionManagerSpinner.abortControllers) {
            controller.abort();
        }
        ConnectionManagerSpinner.abortControllers = [];
    }
}

/**
 * Get named arguments for the command callback.
 * @param {object} [args] Additional named arguments
 * @returns {object} Named arguments
 */
function getNamedArguments(args = {}) {
    // None of the commands here use underscored args, but better safe than sorry
    return {
        _scope: new SlashCommandScope(),
        _abortController: new SlashCommandAbortController(),
        _debugController: new SlashCommandDebugController(),
        _parserFlags: {},
        _hasUnnamedArgument: false,
        quiet: 'true',
        ...args,
    };
}

/** @type {() => SlashCommandEnumValue[]} */
const profilesProvider = () => [
    new SlashCommandEnumValue(NONE),
    ...extension_settings.connectionManager.profiles.map(p => new SlashCommandEnumValue(p.name, null, enumTypes.name, enumIcons.server)),
];

/**
 * @typedef {Object} ConnectionProfile
 * @property {string} id Unique identifier
 * @property {string} mode Mode of the connection profile
 * @property {string} [name] Name of the connection profile
 * @property {string} [api] API
 * @property {string} [preset] Settings Preset
 * @property {string} [model] Model
 * @property {string} [proxy] Proxy Preset
 * @property {string} [instruct] Instruct Template
 * @property {string} [context] Context Template
 * @property {string} [instruct-state] Instruct Mode
 * @property {string} [tokenizer] Tokenizer
 */

/**
 * Finds the best match for the search value.
 * @param {string} value Search value
 * @returns {ConnectionProfile|null} Best match or null
 */
function findProfileByName(value) {
    // Try to find exact match
    const profile = extension_settings.connectionManager.profiles.find(p => p.name === value);

    if (profile) {
        return profile;
    }

    // Try to find fuzzy match
    const fuse = new Fuse(extension_settings.connectionManager.profiles, { keys: ['name'] });
    const results = fuse.search(value);

    if (results.length === 0) {
        return null;
    }

    const bestMatch = results[0];
    return bestMatch.item;
}

/**
 * Reads the connection profile from the commands.
 * @param {string} mode Mode of the connection profile
 * @param {ConnectionProfile} profile Connection profile
 * @param {boolean} [cleanUp] Whether to clean up the profile
 */
async function readProfileFromCommands(mode, profile, cleanUp = false) {
    const commands = mode === 'cc' ? CC_COMMANDS : TC_COMMANDS;
    const opposingCommands = mode === 'cc' ? TC_COMMANDS : CC_COMMANDS;
    for (const command of commands) {
        try {
            const args = getNamedArguments();
            const result = await SlashCommandParser.commands[command].callback(args, '');
            if (result) {
                profile[command] = result;
                continue;
            }
        } catch (error) {
            console.error(`Failed to execute command: ${command}`, error);
        }
    }

    if (cleanUp) {
        for (const command of opposingCommands) {
            if (commands.includes(command)) {
                continue;
            }

            delete profile[command];
        }
    }
}

/**
 * Creates a new connection profile.
 * @param {string} [forceName] Name of the connection profile
 * @returns {Promise<ConnectionProfile>} Created connection profile
 */
async function createConnectionProfile(forceName = null) {
    const mode = main_api === 'openai' ? 'cc' : 'tc';
    const id = uuidv4();
    const profile = {
        id,
        mode,
    };

    await readProfileFromCommands(mode, profile);

    const profileForDisplay = makeFancyProfile(profile);
    const template = await renderExtensionTemplateAsync(MODULE_NAME, 'profile', { profile: profileForDisplay });
    const isNameTaken = (n) => extension_settings.connectionManager.profiles.some(p => p.name === n);
    const suggestedName = getUniqueName(collapseSpaces(`${profile.api ?? ''} ${profile.model ?? ''} - ${profile.preset ?? ''}`), isNameTaken);
    const name = forceName ?? await callGenericPopup(template, POPUP_TYPE.INPUT, suggestedName, { rows: 2 });

    if (!name) {
        return null;
    }

    if (isNameTaken(name) || name === NONE) {
        toastr.error('A profile with the same name already exists.');
        return null;
    }

    profile.name = name;
    return profile;
}

/**
 * Deletes the selected connection profile.
 * @returns {Promise<void>}
 */
async function deleteConnectionProfile() {
    const selectedProfile = extension_settings.connectionManager.selectedProfile;
    if (!selectedProfile) {
        return;
    }

    const index = extension_settings.connectionManager.profiles.findIndex(p => p.id === selectedProfile);
    if (index === -1) {
        return;
    }

    const name = extension_settings.connectionManager.profiles[index].name;
    const confirm = await Popup.show.confirm('Are you sure you want to delete the selected profile?', name);

    if (!confirm) {
        return;
    }

    extension_settings.connectionManager.profiles.splice(index, 1);
    extension_settings.connectionManager.selectedProfile = null;
    saveSettingsDebounced();
}

/**
 * Formats the connection profile for display.
 * @param {ConnectionProfile} profile Connection profile
 * @returns {Object} Fancy profile
 */
function makeFancyProfile(profile) {
    return Object.entries(FANCY_NAMES).reduce((acc, [key, value]) => {
        if (!profile[key]) return acc;
        acc[value] = profile[key];
        return acc;
    }, {});
}

/**
 * Applies the connection profile.
 * @param {ConnectionProfile} profile Connection profile
 * @returns {Promise<void>}
 */
async function applyConnectionProfile(profile) {
    if (!profile) {
        return;
    }

    // Abort any ongoing profile application
    ConnectionManagerSpinner.abort();

    const mode = profile.mode;
    const commands = mode === 'cc' ? CC_COMMANDS : TC_COMMANDS;
    const spinner = new ConnectionManagerSpinner();
    spinner.start();

    for (const command of commands) {
        if (spinner.isAborted()) {
            throw new Error('Profile application aborted');
        }

        const argument = profile[command];
        if (!argument) {
            continue;
        }
        try {
            const args = getNamedArguments();
            await SlashCommandParser.commands[command].callback(args, argument);
        } catch (error) {
            console.error(`Failed to execute command: ${command} ${argument}`, error);
        }
    }

    spinner.stop();
}

/**
 * Updates the selected connection profile.
 * @param {ConnectionProfile} profile Connection profile
 * @returns {Promise<void>}
 */
async function updateConnectionProfile(profile) {
    profile.mode = main_api === 'openai' ? 'cc' : 'tc';
    await readProfileFromCommands(profile.mode, profile, true);
}

/**
 * Renders the connection profile details.
 * @param {HTMLSelectElement} profiles Select element containing connection profiles
 */
function renderConnectionProfiles(profiles) {
    profiles.innerHTML = '';
    const noneOption = document.createElement('option');

    noneOption.value = '';
    noneOption.textContent = NONE;
    noneOption.selected = !extension_settings.connectionManager.selectedProfile;
    profiles.appendChild(noneOption);

    for (const profile of extension_settings.connectionManager.profiles) {
        const option = document.createElement('option');
        option.value = profile.id;
        option.textContent = profile.name;
        option.selected = profile.id === extension_settings.connectionManager.selectedProfile;
        profiles.appendChild(option);
    }
}

/**
 * Renders the content of the details element.
 * @param {HTMLElement} detailsContent Content element of the details
 */
async function renderDetailsContent(detailsContent) {
    detailsContent.innerHTML = '';
    if (detailsContent.classList.contains('hidden')) {
        return;
    }
    const selectedProfile = extension_settings.connectionManager.selectedProfile;
    const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
    if (profile) {
        const profileForDisplay = makeFancyProfile(profile);
        const template = await renderExtensionTemplateAsync(MODULE_NAME, 'view', { profile: profileForDisplay });
        detailsContent.innerHTML = template;
    } else {
        detailsContent.textContent = 'No profile selected';
    }
}

(async function () {
    extension_settings.connectionManager = extension_settings.connectionManager || structuredClone(DEFAULT_SETTINGS);

    for (const key of Object.keys(DEFAULT_SETTINGS)) {
        if (extension_settings.connectionManager[key] === undefined) {
            extension_settings.connectionManager[key] = DEFAULT_SETTINGS[key];
        }
    }

    const container = document.getElementById('rm_api_block');
    const settings = await renderExtensionTemplateAsync(MODULE_NAME, 'settings');
    container.insertAdjacentHTML('afterbegin', settings);

    /** @type {HTMLSelectElement} */
    // @ts-ignore
    const profiles = document.getElementById('connection_profiles');
    renderConnectionProfiles(profiles);

    function toggleProfileSpecificButtons() {
        const profileId = extension_settings.connectionManager.selectedProfile;
        const profileSpecificButtons = ['update_connection_profile', 'reload_connection_profile', 'delete_connection_profile'];
        profileSpecificButtons.forEach(id => document.getElementById(id).classList.toggle('disabled', !profileId));
    }
    toggleProfileSpecificButtons();

    profiles.addEventListener('change', async function () {
        const selectedProfile = profiles.selectedOptions[0];
        if (!selectedProfile) {
            // Safety net for preventing the command getting stuck
            await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, NONE);
            return;
        }

        const profileId = selectedProfile.value;
        extension_settings.connectionManager.selectedProfile = profileId;
        saveSettingsDebounced();
        await renderDetailsContent(detailsContent);

        toggleProfileSpecificButtons();

        // None option selected
        if (!profileId) {
            await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, NONE);
            return;
        }

        const profile = extension_settings.connectionManager.profiles.find(p => p.id === profileId);

        if (!profile) {
            console.log(`Profile not found: ${profileId}`);
            return;
        }

        await applyConnectionProfile(profile);
        await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, profile.name);
    });

    const reloadButton = document.getElementById('reload_connection_profile');
    reloadButton.addEventListener('click', async () => {
        const selectedProfile = extension_settings.connectionManager.selectedProfile;
        const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
        if (!profile) {
            console.log('No profile selected');
            return;
        }
        await applyConnectionProfile(profile);
        await renderDetailsContent(detailsContent);
        await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, profile.name);
        toastr.success('Connection profile reloaded', '', { timeOut: 1500 });
    });

    const createButton = document.getElementById('create_connection_profile');
    createButton.addEventListener('click', async () => {
        const profile = await createConnectionProfile();
        if (!profile) {
            return;
        }
        extension_settings.connectionManager.profiles.push(profile);
        extension_settings.connectionManager.selectedProfile = profile.id;
        saveSettingsDebounced();
        renderConnectionProfiles(profiles);
        await renderDetailsContent(detailsContent);
        await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, profile.name);
    });

    const updateButton = document.getElementById('update_connection_profile');
    updateButton.addEventListener('click', async () => {
        const selectedProfile = extension_settings.connectionManager.selectedProfile;
        const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
        if (!profile) {
            console.log('No profile selected');
            return;
        }
        await updateConnectionProfile(profile);
        await renderDetailsContent(detailsContent);
        saveSettingsDebounced();
        await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, profile.name);
        toastr.success('Connection profile updated', '', { timeOut: 1500 });
    });

    const deleteButton = document.getElementById('delete_connection_profile');
    deleteButton.addEventListener('click', async () => {
        await deleteConnectionProfile();
        renderConnectionProfiles(profiles);
        await renderDetailsContent(detailsContent);
        await eventSource.emit(event_types.CONNECTION_PROFILE_LOADED, NONE);
    });

    /** @type {HTMLElement} */
    const viewDetails = document.getElementById('view_connection_profile');
    const detailsContent = document.getElementById('connection_profile_details_content');
    viewDetails.addEventListener('click', async () => {
        viewDetails.classList.toggle('active');
        detailsContent.classList.toggle('hidden');
        await renderDetailsContent(detailsContent);
    });

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'profile',
        helpString: 'Switch to a connection profile or return the name of the current profile in no argument is provided. Use <code>&lt;None&gt;</code> to switch to no profile.',
        returns: 'name of the profile',
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Name of the connection profile',
                enumProvider: profilesProvider,
                isRequired: false,
            }),
        ],
        namedArgumentList: [
            SlashCommandNamedArgument.fromProps({
                name: 'await',
                description: 'Wait for the connection profile to be applied before returning.',
                isRequired: false,
                typeList: [ARGUMENT_TYPE.BOOLEAN],
                defaultValue: 'true',
                enumList: commonEnumProviders.boolean('trueFalse')(),
            }),
        ],
        callback: async (args, value) => {
            if (!value || typeof value !== 'string') {
                const selectedProfile = extension_settings.connectionManager.selectedProfile;
                const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
                if (!profile) {
                    return NONE;
                }
                return profile.name;
            }

            if (value === NONE) {
                profiles.selectedIndex = 0;
                profiles.dispatchEvent(new Event('change'));
                return NONE;
            }

            const profile = findProfileByName(value);

            if (!profile) {
                return '';
            }

            const shouldAwait = !isFalseBoolean(String(args?.await));
            const awaitPromise = new Promise((resolve) => eventSource.once(event_types.CONNECTION_PROFILE_LOADED, resolve));

            profiles.selectedIndex = Array.from(profiles.options).findIndex(o => o.value === profile.id);
            profiles.dispatchEvent(new Event('change'));

            if (shouldAwait) {
                await awaitPromise;
            }

            return profile.name;
        },
    }));

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'profile-list',
        helpString: 'List all connection profile names.',
        returns: 'list of profile names',
        callback: () => JSON.stringify(extension_settings.connectionManager.profiles.map(p => p.name)),
    }));

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'profile-create',
        returns: 'name of the new profile',
        helpString: 'Create a new connection profile using the current settings.',
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'name of the new connection profile',
                isRequired: true,
                typeList: [ARGUMENT_TYPE.STRING],
            }),
        ],
        callback: async (_args, name) => {
            if (!name || typeof name !== 'string') {
                toastr.warning('Please provide a name for the new connection profile.');
                return '';
            }
            const profile = await createConnectionProfile(name);
            if (!profile) {
                return '';
            }
            extension_settings.connectionManager.profiles.push(profile);
            extension_settings.connectionManager.selectedProfile = profile.id;
            saveSettingsDebounced();
            renderConnectionProfiles(profiles);
            await renderDetailsContent(detailsContent);
            return profile.name;
        },
    }));

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'profile-update',
        helpString: 'Update the selected connection profile.',
        callback: async () => {
            const selectedProfile = extension_settings.connectionManager.selectedProfile;
            const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
            if (!profile) {
                toastr.warning('No profile selected.');
                return '';
            }
            await updateConnectionProfile(profile);
            await renderDetailsContent(detailsContent);
            saveSettingsDebounced();
            return profile.name;
        },
    }));

    SlashCommandParser.addCommandObject(SlashCommand.fromProps({
        name: 'profile-get',
        helpString: 'Get the details of the connection profile. Returns the selected profile if no argument is provided.',
        returns: 'object of the selected profile',
        unnamedArgumentList: [
            SlashCommandArgument.fromProps({
                description: 'Name of the connection profile',
                enumProvider: profilesProvider,
                isRequired: false,
            }),
        ],
        callback: async (_args, value) => {
            if (!value || typeof value !== 'string') {
                const selectedProfile = extension_settings.connectionManager.selectedProfile;
                const profile = extension_settings.connectionManager.profiles.find(p => p.id === selectedProfile);
                if (!profile) {
                    return '';
                }
                return JSON.stringify(profile);
            }

            const profile = findProfileByName(value);
            if (!profile) {
                return '';
            }
            return JSON.stringify(profile);
        },
    }));
})();