import { execFileSync } from 'node:child_process';
import { MSBuildProjectProperties } from './MSBuildProjectProperties.js';

/**
 * All pre-defined properties of {@link MSBuildProjectProperties} except FullPath
 */
export const MSBuildProjectPreDefinedProperties = Object.keys(
	new MSBuildProjectProperties('', false),
).filter((p) => p !== 'FullPath');
/** @todo Experimental and may be removed in a later release.
 * A cache for your evaluated MSBuild Projects.
 */
export const MSBuildEvaluatedProjects: MSBuildProject[] = [];

export class MSBuildProject {
	Properties: MSBuildProjectProperties;

	/**
	 *
	 * @param fullPath The full path of the .NET MSBuild project file.
	 * @param customProperties MSBuild properties to evaluate in addition to those pre-defined in {@link MSBuildProjectProperties}
	 */
	constructor(fullPath: string, customProperties?: string[]) {
		// super();
		this.Properties = MSBuildProject.evaluateProperties(fullPath, customProperties ?? []);
	}

	/**
	 *
	 * `dotnet msbuild src -getProperty:TargetFramework -getProperty:TargetFrameworks -getProperty:RuntimeIdentifiers -getProperty:IsTrimmable`
	 *
	 * ...produces...
	 *
	 * ```json
	 * {
	 *   "Properties": {
	 *     "TargetFramework": "net6.0",
	 *     "TargetFrameworks": "",
	 *     "RuntimeIdentifiers": "win7-x64;win7-x86;win-arm64;linux-x64;linux-arm64",
	 *     "IsTrimmable": "true",
	 *   }
	 * }
	 * ```
	 *
	 * ...which can can be parsed like...
	 * ```js
	 * var ridArray = JSON.parse(out).Properties.RuntimeIdentifiers.split(';');
	 * ```
	 */
	static evaluateProperties(fullPath: string, properties: string[]): MSBuildProjectProperties {
		const evaluatedProps: MSBuildProjectProperties = new MSBuildProjectProperties(fullPath);

		// if a default prop isn't in properties, add it
		const defaultProps = MSBuildProjectPreDefinedProperties;
		for (const defaultProp of defaultProps) {
			if (!properties.includes(defaultProp)) properties.push(defaultProp);
		}
		const getPropArgs: string[] = properties.map((propName) => `-getProperty:${propName}`);
		// should return a single value OR string-encoded JSON object with 'Properties' object-type property.
		const out = execFileSync('dotnet', ['msbuild', evaluatedProps.FullPath, ...getPropArgs], {
			encoding: 'utf8',
			stdio: 'pipe',
		}).trim();
		if (out.startsWith('MSBUILD : error'))
			throw new Error(out);

		let props: Record<string, string>;
		if (out.startsWith('{')) {
			const obj = JSON.parse(out) as object;
			if ("Properties" in obj && typeof obj.Properties === 'object' && obj.Properties !== null)
				props = obj.Properties as Record<string, string>;
			else throw new Error('When evaluating properties with MSBuild, "Properties" could not be found in the deserialized JSON object...\n' + JSON.stringify(obj))
		}
		else {
			props = { [properties[0]]: out.trim() }
		}

		return {
			...evaluatedProps,
			...props,
		};
	}
}