package cnbutils

import (
	"os"
	"path"
	"path/filepath"
	"strings"

	"github.com/SAP/jenkins-library/pkg/log"
	"github.com/pkg/errors"
	ignore "github.com/sabhiram/go-gitignore"
)

func CopyProject(source, target string, include, exclude *ignore.GitIgnore, utils BuildUtils) error {
	sourceFiles, _ := utils.Glob(path.Join(source, "**"))
	for _, sourceFile := range sourceFiles {
		relPath, err := filepath.Rel(source, sourceFile)
		if err != nil {
			log.SetErrorCategory(log.ErrorBuild)
			return errors.Wrapf(err, "Calculating relative path for '%s' failed", sourceFile)
		}
		if !isIgnored(relPath, include, exclude) {
			target := path.Join(target, strings.ReplaceAll(sourceFile, source, ""))
			dir, err := utils.DirExists(sourceFile)
			if err != nil {
				log.SetErrorCategory(log.ErrorBuild)
				return errors.Wrapf(err, "Checking file info '%s' failed", target)
			}

			if dir {
				err = utils.MkdirAll(target, os.ModePerm)
				if err != nil {
					log.SetErrorCategory(log.ErrorBuild)
					return errors.Wrapf(err, "Creating directory '%s' failed", target)
				}
			} else {
				log.Entry().Debugf("Copying '%s' to '%s'", sourceFile, target)
				err = copyFile(sourceFile, target, utils)
				if err != nil {
					log.SetErrorCategory(log.ErrorBuild)
					return errors.Wrapf(err, "Copying '%s' to '%s' failed", sourceFile, target)
				}
			}

		}
	}
	return nil
}

func copyFile(source, target string, utils BuildUtils) error {
	targetDir := filepath.Dir(target)

	exists, err := utils.DirExists(targetDir)
	if err != nil {
		return err
	}

	if !exists {
		log.Entry().Debugf("Creating directory %s", targetDir)
		err = utils.MkdirAll(targetDir, os.ModePerm)
		if err != nil {
			return err
		}
	}

	_, err = utils.Copy(source, target)
	return err
}

func isIgnored(find string, include, exclude *ignore.GitIgnore) bool {
	if exclude != nil {
		filtered := exclude.MatchesPath(find)

		if filtered {
			log.Entry().Debugf("%s matches exclude pattern, ignoring", find)
			return true
		}
	}

	if include != nil {
		filtered := !include.MatchesPath(find)

		if filtered {
			log.Entry().Debugf("%s doesn't match include pattern, ignoring", find)
			return true
		} else {
			log.Entry().Debugf("%s matches include pattern", find)
			return false
		}
	}

	return false
}