package common

/*
 * This file is part of Autogits.
 *
 * Copyright © 2024 SUSE LLC
 *
 * Autogits is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 2 of the License, or (at your option) any later
 * version.
 *
 * Autogits is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * Foobar. If not, see <https://www.gnu.org/licenses/>.
 */

import (
	"bufio"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"regexp"
	"slices"
	"strings"
	"unicode"

	"src.opensuse.org/autogits/common/gitea-generated/models"
)

type NewRepos struct {
	Repos []struct {
		Organization, Repository, Branch string
		PackageName                      string
	}
	IsMaintainer bool
}

const maintainership_line = "MAINTAINER"

var true_lines []string = []string{"1", "TRUE", "YES", "OK", "T"}

func HasSpace(s string) bool {
	return strings.IndexFunc(s, unicode.IsSpace) >= 0
}

func FindNewReposInIssueBody(body string) *NewRepos {
	Issues := &NewRepos{}
	for _, line := range strings.Split(body, "\n") {
		line = strings.TrimSpace(line)
		if ul := strings.ToUpper(line); strings.HasPrefix(ul, "MAINTAINER") {
			value := ""
			if idx := strings.IndexRune(ul, ':'); idx > 0 && len(ul) > idx+2 {
				value = ul[idx+1:]
			} else if idx := strings.IndexRune(ul, ' '); idx > 0 && len(ul) > idx+2 {
				value = ul[idx+1:]
			}

			if slices.Contains(true_lines, strings.TrimSpace(value)) {
				Issues.IsMaintainer = true
			}
		}
		// line = strings.TrimSpace(line)
		issue := struct{ Organization, Repository, Branch, PackageName string }{}

		branch := strings.Split(line, "#")
		repo := strings.Split(branch[0], "/")

		if len(branch) == 2 {
			issue.Branch = strings.TrimSpace(branch[1])
		}
		if len(repo) == 2 {
			issue.Organization = strings.TrimSpace(repo[0])
			issue.Repository = strings.TrimSpace(repo[1])
			issue.PackageName = issue.Repository

			if idx := strings.Index(strings.ToUpper(issue.Branch), " AS "); idx > 0 && len(issue.Branch) > idx+5 {
				issue.PackageName = strings.TrimSpace(issue.Branch[idx+3:])
				issue.Branch = strings.TrimSpace(issue.Branch[0:idx])
			}

			if HasSpace(issue.Organization) || HasSpace(issue.Repository) || HasSpace(issue.PackageName) || HasSpace(issue.Branch) {
				continue
			}
		} else {
			continue
		}
		Issues.Repos = append(Issues.Repos, issue)
		//PackageNameIdx := strings.Index(strings.ToUpper(line), " AS ")
		//words := strings.Split(line)
	}

	if len(Issues.Repos) == 0 {
		return nil
	}
	return Issues
}

func IssueToString(issue *models.Issue) string {
	if issue == nil {
		return "(nil)"
	}

	return fmt.Sprintf("%s/%s#%d", issue.Repository.Owner, issue.Repository.Name, issue.Index)
}

func SplitLines(str string) []string {
	return SplitStringNoEmpty(str, "\n")
}

func SplitStringNoEmpty(str, sep string) []string {
	ret := slices.DeleteFunc(strings.Split(str, sep), func(s string) bool {
		return len(strings.TrimSpace(s)) == 0
	})
	for i := range ret {
		ret[i] = strings.TrimSpace(ret[i])
	}
	return ret
}

func TranslateHttpsToSshUrl(url string) (string, error) {
	const (
		url1 = "https://src.opensuse.org/"
		url2 = "https://src.suse.de/"

		url1_len = len(url1)
		url2_len = len(url2)
	)

	if len(url) > 10 && (url[0:10] == "gitea@src." || url[0:10] == "ssh://gite") {
		return url, nil
	}

	if len(url) > url1_len && url[0:url1_len] == url1 {
		return "ssh://gitea@src.opensuse.org/" + url[url1_len:], nil
	}
	if len(url) > url2_len && url[0:url2_len] == url2 {
		return "ssh://gitea@src.suse.de/" + url[url2_len:], nil
	}

	return "", fmt.Errorf("Unknown input url %s", url)
}

func TranslateSshNativeToUrl(urlString string) (string, error) {
	rx := regexp.MustCompile("^([^:@]+)@?([^:]*):(.+)$")
	m := rx.FindAllStringSubmatch(urlString, -1)
	if m == nil {
		return "", fmt.Errorf("Cannot match expected native SSH schema: %s", urlString)
	}

	if len(m[0][2]) > 0 {
		// with user
		return "ssh://" + m[0][1] + "@" + m[0][2] + "/" + m[0][3], nil
	}
	// without user
	return "ssh://" + m[0][1] + "/" + m[0][3], nil
}

type GitUrl struct {
	Org    string
	Repo   string
	Commit string
}

var valid_schemas []string = []string{"https", "ssh", "http", "file"}

func ParseGitRemoteUrl(urlString string) (*GitUrl, error) {
	url, err := url.Parse(urlString)

	if url != nil && url.Scheme == "file" && err == nil {
		return nil, nil
	}

	if err != nil || !slices.Contains(valid_schemas, url.Scheme) {
		u, err := TranslateSshNativeToUrl(urlString)
		if err != nil {
			return nil, fmt.Errorf("Unable to parse url: %w", err)
		}
		return ParseGitRemoteUrl(u)
	}

	e := SplitStringNoEmpty(url.Path, "/")
	if len(e) != 2 {
		return nil, fmt.Errorf("Unexpected format for Gitea URL: %s", e)
	}

	org := e[0]
	repo := strings.TrimSuffix(e[1], ".git")

	u := GitUrl{
		Org:    org,
		Repo:   repo,
		Commit: url.Fragment,
	}

	return &u, nil
}

func (giturl *GitUrl) RemoteName() string {
	if giturl == nil || len(giturl.Org) == 0 || len(giturl.Repo) == 0 {
		return "origin"
	}

	return strings.ToLower(giturl.Org) + "_" + strings.ToLower(giturl.Repo)
}

func PRtoString(pr *models.PullRequest) string {
	if pr == nil {
		return "(null)"
	}

	return fmt.Sprintf("%s/%s!%d", pr.Base.Repo.Owner.UserName, pr.Base.Repo.Name, pr.Index)
}

type DevelProject struct {
	Project, Package string
}

type DevelProjects []*DevelProject

func FetchDevelProjects() (DevelProjects, error) {
	res, err := http.Get("https://src.opensuse.org/openSUSE/Factory/raw/branch/main/pkgs/_meta/devel_packages")
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	scanner := bufio.NewScanner(res.Body)
	ret := []*DevelProject{}
	for scanner.Scan() {
		d := SplitStringNoEmpty(scanner.Text(), " ")
		if len(d) == 2 {
			ret = append(ret, &DevelProject{
				Project: d[1],
				Package: d[0],
			})
		}
	}

	return ret, nil
}

var DevelProjectNotFound = errors.New("Devel project not found")

func (d DevelProjects) GetDevelProject(pkg string) (string, error) {
	for _, item := range d {
		if item.Package == pkg {
			return item.Project, nil
		}
	}

	return "", DevelProjectNotFound
}

var removedBranchNameSuffixes []string = []string{
	"-rm",
	"-removed",
	"-deleted",
}

func findRemovedBranchSuffix(branchName string) string {
	branchName = strings.ToLower(branchName)

	for _, suffix := range removedBranchNameSuffixes {
		if len(suffix) < len(branchName) && strings.HasSuffix(branchName, suffix) {
			return suffix
		}
	}

	return ""
}

func IsRemovedBranch(branchName string) bool {
	return len(findRemovedBranchSuffix(branchName)) > 0
}

func TrimRemovedBranchSuffix(branchName string) string {
	suffix := findRemovedBranchSuffix(branchName)
	if len(suffix) > 0 {
		return branchName[0 : len(branchName)-len(suffix)]
	}

	return branchName
}