package processors

import (
	"path/filepath"
	"regexp"
	"strings"

	"github.com/pkg/errors"

	"github.com/golangci/golangci-lint/pkg/result"
)

func filterIssues(issues []result.Issue, filter func(i *result.Issue) bool) []result.Issue {
	retIssues := make([]result.Issue, 0, len(issues))
	for i := range issues {
		if filter(&issues[i]) {
			retIssues = append(retIssues, issues[i])
		}
	}

	return retIssues
}

func filterIssuesErr(issues []result.Issue, filter func(i *result.Issue) (bool, error)) ([]result.Issue, error) {
	retIssues := make([]result.Issue, 0, len(issues))
	for i := range issues {
		ok, err := filter(&issues[i])
		if err != nil {
			return nil, errors.Wrapf(err, "can't filter issue %#v", issues[i])
		}

		if ok {
			retIssues = append(retIssues, issues[i])
		}
	}

	return retIssues, nil
}

func transformIssues(issues []result.Issue, transform func(i *result.Issue) *result.Issue) []result.Issue {
	retIssues := make([]result.Issue, 0, len(issues))
	for i := range issues {
		newI := transform(&issues[i])
		if newI != nil {
			retIssues = append(retIssues, *newI)
		}
	}

	return retIssues
}

var separatorToReplace = regexp.QuoteMeta(string(filepath.Separator))

func normalizePathInRegex(path string) string {
	if filepath.Separator == '/' {
		return path
	}

	// This replacing should be safe because "/" are disallowed in Windows
	// https://docs.microsoft.com/ru-ru/windows/win32/fileio/naming-a-file
	return strings.ReplaceAll(path, "/", separatorToReplace)
}