/*!
 * V4Fire Client Core
 * https://github.com/V4Fire/Client
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Client/blob/master/LICENSE
 */

import path from 'upath';
import type { JSHandle, Locator, Page } from 'playwright';
import { resolve } from '@pzlr/build-core';

import { Component, DOM, Utils } from 'tests/helpers';
import type ComponentObject from 'tests/helpers/component-object';

import type iBlock from 'super/i-block/i-block';

import type { BuildOptions } from 'tests/helpers/component-object/interface';
import type { ComponentInDummy } from 'tests/helpers/component/interface';

/**
 * A class implementing the `ComponentObject` approach that encapsulates different
 * interactions with a component from the client.
 *
 * This class provides a basic API for creating or selecting any component and interacting with it during tests.
 *
 * However, the recommended usage is to inherit from this class and implement a specific `ComponentObject`
 * that encapsulates and enhances the client's interaction with component during the test.
 */
export default abstract class ComponentObjectBuilder<COMPONENT extends iBlock> {
	/**
	 * The name of the component to be rendered.
	 */
	readonly componentName: string;

	/**
	 * The props of the component.
	 */
	readonly props: Dictionary = {};

	/**
	 * The children of the component.
	 */
	readonly children: VNodeChildren = {};

	/**
	 * The locator for the root node of the component.
	 */
	readonly node: Locator;

	/**
	 * The path to the class used to build the component.
	 * By default, it generates the path using `plzr.resolve.blockSync(componentName)`.
	 *
	 * This field is used for setting up various mocks and spies.
	 * Setting the path is optional if you're not using the `spy` API.
	 */
	readonly componentClassImportPath: Nullable<string>;

	/**
	 * The page on which the component is located.
	 */
	readonly pwPage: Page;

	/**
	 * The unique ID of the component generated when the constructor is called.
	 */
	protected id: string;

	/**
	 * Stores a reference to the component's `JSHandle`.
	 */
	protected componentStore?: JSHandle<COMPONENT>;

	/**
	 * Reference to the `b-dummy` wrapper component.
	 */
	protected dummy?: ComponentInDummy<COMPONENT>;

	/**
	 * The component selector
	 */
	protected nodeSelector?: string;

	/**
	 * The component styles that should be inserted into the page
	 */
	get componentStyles(): CanUndef<string> {
		return undefined;
	}

	/**
	 * Public access to the reference of the component's `JSHandle`
	 * @throws {@link ReferenceError} if trying to access a component that has not been built or picked
	 */
	get component(): Promise<JSHandle<COMPONENT>> {
		if (this.componentStore) {
			return Promise.resolve(this.componentStore);
		}

		if (this.nodeSelector == null) {
			throw new ReferenceError('Bad access to the component without "build" or "pick" call');
		}

		return this.node.elementHandle()
			.then((node) => node!.getProperty('component'));
	}

	/**
	 * Returns `true` if the component is built or picked
	 */
	get isBuilt(): boolean {
		return Boolean(this.componentStore);
	}

	/**
	 * @param page - the page on which the component is located
	 * @param componentName - the name of the component to be rendered
	 * @param [nodeSelector] - the component selector (it can be passed later using the pick method).
	 */
	constructor(page: Page, componentName: string, nodeSelector?: string) {
		this.pwPage = page;
		this.componentName = componentName;
		this.id = `${this.componentName}_${Math.random().toString()}`;
		this.props = {'data-component-object-id': this.id};
		this.node = page.locator(nodeSelector ?? `[data-component-object-id="${this.id}"]`);
		this.nodeSelector = nodeSelector;
		this.componentClassImportPath = path.join(
			path.relative(`${process.cwd()}/src`, resolve.blockSync(this.componentName)!),
			`/${this.componentName}.ts`
		);
	}

	/**
	 * A shorthand for generating selectors for component elements.
	 * {@link DOM.elNameSelectorGenerator}
	 *
	 * @example
	 * ```typescript
	 * this.elSelector('element') // .${componentName}__element
	 * ```
	 */
	elSelector(elName: string): string {
		return DOM.elNameSelectorGenerator(this.componentName, elName);
	}

	/**
	 * Returns the base class of the component
	 */
	async getComponentClass(): Promise<JSHandle<new () => COMPONENT>> {
		const {componentClassImportPath} = this;

		if (componentClassImportPath == null) {
			throw new Error('Missing component path');
		}

		const
			classModule = await Utils.import<{default: new () => COMPONENT}>(this.pwPage, componentClassImportPath),
			classInstance = await classModule.evaluateHandle((ctx) => ctx.default);

		return classInstance;
	}

	/**
	 * Renders the component with the previously set props and children
	 * using the `withProps` and `withChildren` methods.
	 *
	 * @param [options]
	 */
	async build(options?: BuildOptions): Promise<JSHandle<COMPONENT>> {
		await this.insertComponentStyles();

		const
			name = this.componentName,
			fullComponentName = `${name}${options?.functional && !name.endsWith('-functional') ? '-functional' : ''}`;

		const normalizeChildren = () => {
			const result: Dictionary<RenderContent | RenderContentFn | string> = {};

			const normalizeVNode = (vNode) => ({...vNode, tag: vNode.type});

			Object.entries(this.children).forEach(([slotName, child]) => {
				if (child == null || Object.isString(child) || Object.isFunction(child)) {
					result[slotName] = Object.cast(child);
					return;
				}

				if (Array.isArray(child)) {
					result[slotName] = Object.cast(child.map(normalizeVNode));
				}

				result[slotName] = normalizeVNode(child);
			});

			return result;
		};

		if (options?.useDummy) {
			const component = await Component.createComponentInDummy<COMPONENT>(this.pwPage, fullComponentName, {
				attrs: this.props,
				children: this.children
			});

			this.dummy = component;
			this.componentStore = component;

		} else {
			this.componentStore = await Component.createComponent(this.pwPage, fullComponentName, {
				attrs: this.props,
				content: normalizeChildren()
			});
		}

		return this.componentStore;
	}

	/**
	 * Picks the `Node` with the provided selector and extracts the `component` property,
	 * which will be assigned to the {@link ComponentObject.component}.
	 *
	 * After this operation, the `ComponentObject` will be marked as built
	 * and the {@link ComponentObject.component} property will be accessible.
	 *
	 * @param selector - the selector or locator for the component node
	 */
	async pick(selector: string): Promise<this>;

	/**
	 * Extracts the `component` property from the provided locator,
	 * which will be assigned to the {@link ComponentObject.component}.
	 *
	 * After this operation, the `ComponentObject` will be marked as built
	 * and the {@link ComponentObject.component} property will be accessible.
	 *
	 * @param locator - the locator for the component node
	 */
	async pick(locator: Locator): Promise<this>;

	/**
	 * Waits for promise to resolve and extracts the `component` property from the provided locator,
	 * which will be assigned to the {@link ComponentObject.component}.
	 *
	 * After this operation, the `ComponentObject` will be marked as built
	 * and the {@link ComponentObject.component} property will be accessible.
	 *
	 * @param locatorPromise - the promise that resolves to locator for the component node
	 */
	async pick(locatorPromise: Promise<Locator>): Promise<this>;

	async pick(selectorOrLocator: string | Locator | Promise<Locator>): Promise<this> {
		await this.insertComponentStyles();
		// eslint-disable-next-line no-nested-ternary
		const locator = Object.isString(selectorOrLocator) ?
			this.pwPage.locator(selectorOrLocator) :
			Object.isPromise(selectorOrLocator) ? await selectorOrLocator : selectorOrLocator;

		this.componentStore = await locator.elementHandle().then(async (el) => {
			await el?.evaluate((ctx, [id]) => ctx.setAttribute('data-component-object-id', id), [this.id]);
			return el?.getProperty('component');
		});

		return this;
	}

	/**
	 * Inserts into page styles of components that are defined in the {@link ComponentObject.componentStyles} property
	 */
	async insertComponentStyles(): Promise<void> {
		if (this.componentStyles != null) {
			await this.pwPage.addStyleTag({content: this.componentStyles});
		}
	}

	/**
	 * Stores the provided props.
	 * The stored props will be assigned when the component is created or picked.
	 *
	 * @param props - the props to set
	 */
	withProps(props: Dictionary): this {
		if (!this.isBuilt) {
			Object.assign(this.props, props);
		}

		return this;
	}

	/**
	 * Stores the provided children.
	 * The stored children will be assigned when the component is created.
	 *
	 * @param children - the children to set
	 */
	withChildren(children: VNodeChildren): this {
		Object.assign(this.children, children);
		return this;
	}


	/**
	 * Updates the component's props or children using the `b-dummy` component.
	 * This method will not work if the component was built without the `useDummy` option.
	 *
	 * @param props
	 * @param [mixInitialProps] - if true, the initially set props will be mixed with the passed props
	 *
	 * @throws {@link ReferenceError} - if the component object was not built or was built without the `useDummy` option
	 */
	update(props: RenderComponentsVnodeParams, mixInitialProps: boolean = true): Promise<void> {
		if (!this.dummy) {
			throw new ReferenceError('Failed to update component. Missing "b-dummy" component.');
		}

		return this.dummy.update(props, mixInitialProps);
	}

	/**
	 * Updates the component's props using the `b-dummy` component.
	 * This method will not work if the component was built without the `useDummy` option.
	 *
	 * By default, the passed props will be merged with the previously set props,
	 * but this behavior can be cancelled by specifying the second argument as false.
	 *
	 * @param props
	 * @param [mixInitialProps] - if true, the initially set props will be mixed with the passed props
	 *
	 * @throws {@link ReferenceError} - if the component object was not built or was built without the `useDummy` option
	 */
	updateProps(props: RenderComponentsVnodeParams['attrs'], mixInitialProps: boolean = true): Promise<void> {
		if (!this.dummy) {
			throw new ReferenceError('Failed to update props. Missing "b-dummy" component.');
		}

		return this.dummy.update({attrs: props}, mixInitialProps);
	}

	/**
	 * Updates the component's children using the `b-dummy` component.
	 * This method will not work if the component was built without the `useDummy` option.
	 *
	 * @param children
	 *
	 * @throws {@link ReferenceError} - if the component object was not built or was built without the `useDummy` option
	 */
	updateChildren(children: RenderComponentsVnodeParams['children']): Promise<void> {
		if (!this.dummy) {
			throw new ReferenceError('Failed to update children. Missing "b-dummy" component.');
		}

		return this.dummy.update({children});
	}
}