import { readFile } from 'fs/promises';
import { dirname, basename, resolve } from 'path';
import { glob } from 'glob';
import { minimatch } from 'minimatch';

export interface AmanuensisConfig {
	package: {
		searchPatterns: string | string[];
		classifications: Record<string, Record<string, string | string[]>>;
	}
}

interface TypedocDataTextNode {
	kind: 'text';
	text: string;
}

interface TypedocDataInlineTagNode {
	kind: 'inline-tag';
	tag: string;
	text: string;
	target: number;
	tsLinkText: string;
}

interface SymbolIdMapEntry {
	sourceFileName: string;
	qualifiedName: string;
}

type TypedocDataNode = TypedocDataTextNode | TypedocDataInlineTagNode;

export interface TypedocData {
	packages: any[];
	typedocData: {
		readme: TypedocDataNode[];
		symbolIdMap: Record<string, SymbolIdMapEntry>;
	};
}

export const getReadmeText = async (cwd = process.cwd()) => {
	const typedocDataJsonPath = resolve(cwd, '.amanuensis', 'data.json');
	const typedocDataJson = await readFile(typedocDataJsonPath, 'utf-8');
	const typedocData = JSON.parse(typedocDataJson) as {
		typedocData: {
			readme: { kind: string, text: string }[]
		}
	};
	return typedocData.typedocData.readme.reduce(
		(theText, node) => {
			if (node.kind === 'text') {
				return `${theText}${node.text}`;
			}
			return theText;
		},
		'',
	);
};

export const getPackages = async (cwd = process.cwd()) => {
	const configPath = resolve(cwd, '.amanuensis', 'config.json');
	const configString = await readFile(configPath, 'utf-8');
	const config = JSON.parse(configString) as AmanuensisConfig;
	const searchPatternsRaw = config.package.searchPatterns;
	const searchPatterns = Array.isArray(searchPatternsRaw) ? searchPatternsRaw : [searchPatternsRaw];
	const patternPackagePaths = await Promise.all(
		searchPatterns.map(async (searchPattern) => glob(
			searchPattern === 'package.json' || searchPattern.endsWith('/package.json')
				? searchPattern
				: `${searchPattern}/package.json`,
			{
				ignore: ['**/node_modules/**'],
			},
		)),
	);
	const packagePaths = patternPackagePaths.flat();
	const markdownFilePaths = await glob(
		'**/*.{md,mdx}',
		{
			ignore: ['**/node_modules/**'],
		},
	);
	return Promise.all(
		packagePaths.map(async (packagePath) => {
			const packageString = await readFile(packagePath, 'utf-8');
			const basePath = dirname(packagePath);
			const packageJson = JSON.parse(packageString) as { name: string };
			const classifications = Object.fromEntries(
				Object.entries(config.package.classifications)
					.map(([classification, c]) => {
						const [thisClassifications] = Object.entries(c)
							.find(([, globRaw]) => {
								const globs = Array.isArray(globRaw) ? globRaw : [globRaw];
								return globs.some((g) => minimatch(packageJson.name, g));
							}) ?? [];
						return [classification, thisClassifications] as const;
					}),
			);

			const markdownFiles = markdownFilePaths.filter((markdownFilePath) => (
				markdownFilePath.startsWith(basePath)
			));

			const markdown = await Promise.all(
				markdownFiles.map(async (markdownFilePath) => {
					const content = await readFile(markdownFilePath, 'utf-8');
					const filePath = markdownFilePath.slice(basePath.length + 1);
					const file = filePath.split('/').at(-1) ?? '';
					const name = filePath === 'README.md' ? 'index.md' : basename(file);

					return {
						name,
						filePath,
						content,
					};
				}),
			);

			return {
				name: packageJson.name,
				packageJson,
				basePath,
				markdown,
				classifications,
			};
		}),
	);
};

export const getFileSources = async (cwd = process.cwd()) => {
	const typedocDataJsonPath = resolve(cwd, '.amanuensis', 'data.json');
	const typedocDataJson = await readFile(typedocDataJsonPath, 'utf-8');
	const typedocData = JSON.parse(typedocDataJson) as TypedocData;
	const symbolIdMapEntries = Object.values(typedocData.typedocData.symbolIdMap);
	const firstPartySources = symbolIdMapEntries.filter(
		({ sourceFileName }) => !sourceFileName.startsWith('node_modules'),
	);
	const firstPartySourceFiles = firstPartySources.map(({ sourceFileName }) => sourceFileName);
	const uniqueFirstPartySourceFiles = [...new Set(firstPartySourceFiles)];
	return uniqueFirstPartySourceFiles;
};