package common

import (
	"os"
	"path"
	"strings"

	"gopkg.in/yaml.v3"
)

type Manifest struct {
	Subdirectories []string
}

func (m *Manifest) SubdirForPackage(pkg string) string {
	if m == nil {
		return pkg
	}

	idx := -1
	matchLen := 0
	basePkg := path.Base(pkg)
	lowercasePkg := strings.ToLower(basePkg)

	for i, sub := range m.Subdirectories {
		basename := strings.ToLower(path.Base(sub))
		if strings.HasPrefix(lowercasePkg, basename) && matchLen < len(basename) {
			idx = i
			matchLen = len(basename)
		}
	}

	if idx > -1 {
		return path.Join(m.Subdirectories[idx], basePkg)
	}
	return pkg
}

func ReadManifestFile(filename string) (*Manifest, error) {
	data, err := os.ReadFile(filename)
	if err != nil {
		return nil, err
	}

	return ParseManifestFile(data)
}

func ParseManifestFile(data []byte) (*Manifest, error) {
	ret := &Manifest{}
	err := yaml.Unmarshal(data, ret)
	if err != nil {
		return nil, err
	}

	return ret, nil
}