import { existsSync, readFileSync } from 'node:fs';
import { writeFile } from 'node:fs/promises';
import { basename, dirname } from 'node:path/posix';
import { promisify } from 'node:util';
import { generate } from 'astring';
import type * as estree from 'estree';
import * as glob from 'glob';
import { format } from 'prettier';

function h<T extends estree.Node>(component: T['type'], props: Omit<T, 'type'>): T {
	const type = component.replace(/(?:^|-)([a-z])/g, (_, c) => c.toUpperCase());
	return Object.assign(props, { type }) as T;
}

function toStories(component: string): string {
	const msw = `${component.slice(0, -'.vue'.length)}.msw`;
	const implStories = `${component.slice(0, -'.vue'.length)}.stories.impl`;
	const hasMsw = existsSync(`${msw}.ts`);
	const hasImplStories = existsSync(`${implStories}.ts`);
	const base = basename(component);
	const dir = dirname(component);
	const literal = (
		<literal value={component.slice('src/'.length, -'.vue'.length)} />
	) as unknown as estree.Literal;
	const identifier = (
		<identifier name={base.slice(0, -'.vue'.length).replace(/[-.]|^(?=\d)/g, '_')} />
	) as unknown as estree.Identifier;
	const parameters = (
		<object-expression
			properties={[
				<property
					key={<identifier name="layout" />}
					value={<literal value={`${dir}/`.startsWith('src/pages/') ? 'fullscreen' : 'centered'} />}
					kind="init"
				/>,
				...hasMsw
					? [
							<property
								key={<identifier name="msw" />}
								value={<identifier name="msw" />}
								kind="init"
								shorthand
							/>,
						]
					: [],
			]}
		/>
	);
	const program = (
		<program
			body={[
				<import-declaration
					source={<literal value="@storybook/vue3" />}
					specifiers={[
						<import-specifier
							local={<identifier name="Meta" />}
							imported={<identifier name="Meta" />}
						/>,
						<import-specifier
							local={<identifier name="Story" />}
							imported={<identifier name="Story" />}
						/>,
					]}
				/>,
				...hasMsw
					? [
							<import-declaration
								source={<literal value={`./${basename(msw)}`} />}
								specifiers={[
									<import-namespace-specifier
										local={<identifier name="msw" />}
									/>,
								]}
							/>,
						]
					: [],
				...hasImplStories
					? []
					: [
							<import-declaration
								source={<literal value={`./${base}`} />}
								specifiers={[
									<import-default-specifier
										local={identifier}
										imported={identifier}
									/>,
								]}
							/>,
						],
				<variable-declaration
					kind="const"
					declarations={[
						<variable-declarator
							id={<identifier name="meta" />}
							init={
								<object-expression
									properties={[
										<property
											key={<identifier name="title" />}
											value={literal}
											kind="init"
										/>,
										<property
											key={<identifier name="component" />}
											value={identifier}
											kind="init"
										/>,
									]}
								/>
							}
						/>,
					]}
				/>,
				...hasImplStories
					? [
						]
					: [
							<export-named-declaration
								declaration={
									<variable-declaration
										kind="const"
										declarations={[
											<variable-declarator
												id={<identifier name="Default" />}
												init={
													<object-expression
														properties={[
															<property
																key={<identifier name="render" />}
																value={
																	<function-expression
																		id={<identifier name="render" />}
																		params={[
																			<identifier name="args" />,
																			<object-pattern
																				properties={[
																					<property
																						key={<identifier name="argTypes" />}
																						value={<identifier name="argTypes" />}
																						kind="init"
																						shorthand
																					/>,
																				]}
																			/>,
																		]}
																		body={
																			<block-statement
																				body={[
																					<return-statement
																						argument={
																							<object-expression
																								properties={[
																									<property
																										key={<identifier name="components" />}
																										value={
																											<object-expression
																												properties={[
																													<property
																														key={identifier}
																														value={identifier}
																														kind="init"
																														shorthand
																													/>,
																												]}
																											/>
																										}
																										kind="init"
																									/>,
																									<property
																										key={<identifier name="props" />}
																										value={
																											<call-expression
																												callee={
																													<member-expression
																														object={<identifier name="Object" />}
																														property={<identifier name="keys" />}
																													/>
																												}
																												arguments={[
																													<identifier name="argTypes" />,
																												]}
																											/>
																										}
																										kind="init"
																									/>,
																									<property
																										key={<identifier name="template" />}
																										value={<literal value={`<${identifier.name} v-bind="$props" />`} />}
																										kind="init"
																									/>,
																								]}
																							/>
																						}
																					/>,
																				]}
																			/>
																		}
																	/>
																}
																method
																kind="init"
															/>,
															<property
																key={<identifier name="parameters" />}
																value={parameters}
																kind="init"
															/>,
														]}
													/>
												}
											/>,
										]}
									/>
								}
							/>,
						],
				<export-default-declaration
					declaration={<identifier name="meta" />}
				/>,
			]}
		/>
	) as unknown as estree.Program;
	return format(
		generate(program) + (hasImplStories ? readFileSync(`${implStories}.ts`, 'utf-8') : ''),
		{
			parser: 'babel-ts',
			singleQuote: true,
			useTabs: true,
		}
	);
}

promisify(glob)('src/{components,pages,ui,widgets}/**/*.vue').then((components) => Promise.all(
	components.map((component) => {
		const stories = component.replace(/\.vue$/, '.stories.ts');
		return writeFile(stories, toStories(component));
	})
));