import { existsSync, readFileSync } from "fs";
import { join } from "path";

export interface SkillConfig {
	ignorePatterns: string[];
	smallPackageThreshold: number;
	llmProvider: "openai" | "kimi" | "pi";
	llmModel: string;
	llmBaseUrl?: string;
	contextBudget: number;
	autoInjectPrompt: boolean;
	tagCap: number;
	workflowHintCap: number;
}

export const DEFAULT_CONFIG: SkillConfig = {
	ignorePatterns: [
		"node_modules",
		".git",
		"dist",
		"build",
		"coverage",
		".next",
		".venv",
		"__pycache__",
		".DS_Store",
		"*.log",
		".pi-map.md",
		".pi-map.index.md",
		".cache",
		"tmp",
		"temp",
		".tmp",
		".turbo",
		".parcel-cache",
		".eslintcache",
		".prettiercache",
	],
	smallPackageThreshold: 10,
	llmProvider: "openai",
	llmModel: "gpt-4o-mini",
	contextBudget: 4000,
	autoInjectPrompt: true,
	tagCap: 8,
	workflowHintCap: 5,
};

export function loadConfig(cwd: string = process.cwd()): SkillConfig {
	const configPath = join(cwd, ".pi-project-map.json");
	if (existsSync(configPath)) {
		try {
			const content = readFileSync(configPath, "utf8");
			const userConfig = JSON.parse(content);
			return { ...DEFAULT_CONFIG, ...userConfig };
		} catch {
			// Fall through to default
		}
	}
	return DEFAULT_CONFIG;
}