import {
	EMPTY_PROJECT_CONFIG,
	getProjectConfigPath,
	type ProjectConfig,
} from "@/model/projectConfig";
import { IConfigProvider, IFileSystem } from "@/ports";
import { parseProjectConfig } from "./parseProjectConfig";
import { serializeProjectConfig } from "./serializeProjectConfig";

export class ProjectConfigService {
	#fs: IFileSystem;
	#config: IConfigProvider;

	constructor(fs: IFileSystem, config: IConfigProvider) {
		this.#fs = fs;
		this.#config = config;
	}

	async load(): Promise<ProjectConfig> {
		const folderPath = this.#config.getProjectTaskPath();
		if (!folderPath) return { ...EMPTY_PROJECT_CONFIG };

		const path = getProjectConfigPath(folderPath);
		try {
			const content = await this.#fs.readFile(path);
			const parsed = parseProjectConfig(content);
			if (parsed.isErr()) return { ...EMPTY_PROJECT_CONFIG };
			return parsed.value;
		} catch {
			return { ...EMPTY_PROJECT_CONFIG };
		}
	}

	async merge(partial: Partial<ProjectConfig>): Promise<void> {
		const folderPath = this.#config.getProjectTaskPath();
		if (!folderPath) return;

		const current = await this.load();
		const merged: ProjectConfig = { ...current, ...partial };
		const content = serializeProjectConfig(merged);
		await this.#fs.writeFile(getProjectConfigPath(folderPath), content);
	}
}