package config

import (
	"os"
	"strings"
)

// parseDotEnv loads a KEY=VALUE .env file into a map. It is tolerant by design:
// a missing file yields an empty map and no error, because .env is a
// development-only convenience. Values may be single- or double-quoted and may
// carry an optional `export` prefix. Lines starting with `#` and blank lines
// are ignored.
func parseDotEnv(path string) (map[string]string, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return map[string]string{}, nil
		}
		return nil, err
	}

	env := make(map[string]string)
	for _, raw := range strings.Split(string(data), "\n") {
		line := strings.TrimSpace(raw)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		line = strings.TrimPrefix(line, "export ")
		key, val, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		key = strings.TrimSpace(key)
		val = strings.TrimSpace(val)
		val = strings.Trim(val, `"'`)
		env[key] = val
	}
	return env, nil
}