package main

import (
	"flag"
	"fmt"
	"log"
	"math/rand"
	"os"
	"path/filepath"
	"slices"
	"sync"
	"time"

	"src.opensuse.org/autogits/common"
)

var configuredRepos map[string]*common.AutogitConfig
var gitea *common.GiteaTransport

func isConfiguredOrg(org *common.Organization) bool {
	_, found := configuredRepos[org.Username]
	return found
}

func processRepositoryAction(h *common.RequestHandler) error {
	action := h.Request.Data.(*common.RepositoryWebhookEvent)
	config, configFound := configuredRepos[action.Organization.Username]

	if !configFound {
		if h.Git.DebugLogger {
			h.StdLogger.Printf("Repository event for %s. Not configured. Ignoring.\n", action.Organization.Username)
		}
		return nil
	}

	prjgit := config.GitProjectName
	if action.Repository.Name == prjgit {
		if h.Git.DebugLogger {
			h.StdLogger.Printf("repository event %s for PrjGit '%s'. Ignoring\n", common.DefaultGitPrj, action.Action)
		}
		return nil
	}

	prjGitRepo, err := gitea.CreateRepositoryIfNotExist(h.Git, *action.Organization, prjgit)
	if err != nil {
		return fmt.Errorf("Error accessing/creating prjgit: %s err: %w", prjgit, err)
	}
	h.Git.GitExec("", "clone", "--depth", "1", prjGitRepo.SSHURL, common.DefaultGitPrj)

	switch action.Action {
	case "created":
		h.Git.GitExec(common.DefaultGitPrj, "submodule", "--quiet", "add", "--depth", "1", action.Repository.Clone_Url)
		h.Git.GitExec(common.DefaultGitPrj, "commit", "-m", "Automatic package inclusion via Direct Workflow")
		h.Git.GitExec(common.DefaultGitPrj, "push")

	case "deleted":
		if stat, err := os.Stat(filepath.Join(h.Git.GitPath, common.DefaultGitPrj, action.Repository.Name)); err != nil || !stat.IsDir() {
			if h.Git.DebugLogger {
				h.StdLogger.Printf("delete event for %s -- not in project. Ignoring\n", action.Repository.Name)
			}
			return nil
		}
		h.Git.GitExec(common.DefaultGitPrj, "rm", action.Repository.Name)
		h.Git.GitExec(common.DefaultGitPrj, "commit", "-m", "Automatic package removal via Direct Workflow")
		h.Git.GitExec(common.DefaultGitPrj, "push")

	default:
		return fmt.Errorf("%s: %s", "Unknown action type", action.Action)
	}

	return nil
}

func processPushAction(h *common.RequestHandler) error {
	action := h.Request.Data.(*common.PushWebhookEvent)
	config, configFound := configuredRepos[action.Repository.Owner.Username]

	if !configFound {
		if h.Git.DebugLogger {
			h.StdLogger.Printf("Push event to Organizationr '%s'. Not configured. Ignoring.\n", action.Repository.Owner.Username)
		}
		return nil
	}

	prjgit := config.GitProjectName
	if action.Repository.Name == prjgit {
		if h.Git.DebugLogger {
			h.StdLogger.Printf("push to %s -- ignoring\n", prjgit)
		}
		return nil
	}

	prjGitRepo, err := gitea.CreateRepositoryIfNotExist(h.Git, *action.Repository.Owner, prjgit)
	if err != nil {
		return fmt.Errorf("Error accessing/creating prjgit: %s err: %w", prjgit, err)
	}
	h.Git.GitExec("", "clone", "--depth", "1", prjGitRepo.SSHURL, common.DefaultGitPrj)
	if stat, err := os.Stat(filepath.Join(h.Git.GitPath, common.DefaultGitPrj, action.Repository.Name)); err != nil || !stat.IsDir() {
		if h.Git.DebugLogger {
			h.StdLogger.Printf("Pushed to package that is not part of the project. Ignoring: %v\n", err)
		}
		return nil
	}
	h.Git.GitExec(common.DefaultGitPrj, "submodule", "update", "--init", "--depth", "1", "--checkout", action.Repository.Name)
	id, _ := h.Git.GitBranchHead(filepath.Join(common.DefaultGitPrj, action.Repository.Name), action.Repository.Default_Branch)
	for _, commitId := range action.Commits {
		if commitId.Id == id {
			h.Git.GitExec(filepath.Join(common.DefaultGitPrj, action.Repository.Name), "fetch", "--depth", "1", "origin", id)
			h.Git.GitExec(filepath.Join(common.DefaultGitPrj, action.Repository.Name), "checkout", id)
			h.Git.GitExec(common.DefaultGitPrj, "commit", "-a", "-m", "Automatic update via push via Direct Workflow")
			h.Git.GitExec(common.DefaultGitPrj, "push")
			return nil
		}
	}

	h.StdLogger.Println("push of refs not on the main branch. ignoring.")
	return nil
}

func verifyProjectState(git *common.GitHandler, orgName string, config *common.AutogitConfig) error {
	org := common.Organization{
		Username: orgName,
	}
	repo, err := gitea.CreateRepositoryIfNotExist(git, org, config.GitProjectName)
	if err != nil {
		return fmt.Errorf("Error fetching or creating '%s/%s' -- aborting verifyProjectState(). Err: %w", orgName, config.GitProjectName, err)
	}

	if err := git.GitExec("", "clone", "--depth", "1", repo.SSHURL, config.GitProjectName); err != nil {
		return fmt.Errorf("Error closing projectgit for %s, Err: %w", config.GitProjectName, err)
	}

	sub, err := git.GitSubmoduleList(config.GitProjectName, "HEAD")
	if err != nil {
		return fmt.Errorf("Failed to fetch submodule list... Err: %w", err)
	}

	isGitUpdated := false
	for filename, commitId := range sub {
		commits, err := gitea.GetRecentCommits(orgName, filename, config.Branch, 10)
		if err != nil {
			return fmt.Errorf("Failed to fetch recent commits for package: '%s'. Err: %w", filename, err)
		}

		idx := 1000
		for i, c := range commits {
			if c.SHA == commitId {
				idx = i
				break
			}
		}

		if idx == 0 {
			// up-to-date
			continue
		} else if idx < len(commits) { // update
			git.GitExec(config.GitProjectName, "submodule", "update", "--init", "--depth", "1", "--checkout", filename)
			git.GitExec(filepath.Join(config.GitProjectName, filename), "fetch", "--depth", "1", "origin", commits[0].SHA)
			git.GitExec(filepath.Join(config.GitProjectName, filename), "checkout", commits[0].SHA)
			isGitUpdated = true
		} else {
			// probably need `merge-base` or `rev-list` here instead, or the project updated already
			return fmt.Errorf("Cannot find SHA of last matching update for package: '%s'.  idx: %d", filename, idx)
		}
	}

	if isGitUpdated {
		git.GitExec(common.DefaultGitPrj, "commit", "-a", "-m", "Automatic update via push via Direct Workflow -- SYNC")
		git.GitExec(common.DefaultGitPrj, "push")
		// commit changes and push
	}

	return nil
}

var checkOnStart bool
var checkInterval time.Duration

func consistencyCheckProcess(git *common.GitHandler, repos map[string]*common.AutogitConfig) {
	if checkOnStart {
		var wg sync.WaitGroup
		for org, conf := range repos {

			wg.Add(1)
			go func() {
				defer wg.Done()

				verifyProjectState(git, org, conf)
			}()
		}
		wg.Wait()
		log.Printf("== Startup consistency check done...")
	}

	for org, conf := range repos {
		time.Sleep(checkInterval - checkInterval/2 + time.Duration(rand.Int63n(int64(checkInterval))))

		log.Printf(" ++ starting verification, org: `%s`\n", org)
		if err := verifyProjectState(git, org, conf); err != nil {
			log.Printf(" *** verification failed, org: `%s`, err: %#v\n", org, err)
		}
		log.Printf(" ++ verification complete, org: `%s`\n", org)
	}
}

var debugMode bool

func main() {
	workflowConfig := flag.String("config", "", "Repository and workflow definition file")
	giteaHost := flag.String("gitea", "src.opensuse.org", "Gitea instance")
	rabbitUrl := flag.String("url", "amqps://rabbit.opensuse.org", "URL for RabbitMQ instance")
	flag.BoolVar(&debugMode, "debug", false, "Extra debugging information")
	flag.BoolVar(&checkOnStart, "check-on-start", false, "Check all repositories for consistency on start, without delays")
	checkIntervalHours := flag.Float64("check-interval", 5, "Check interval (+-random delay) for repositories for consitency, in hours")
	flag.Parse()

	checkInterval = time.Duration(*checkIntervalHours) * time.Hour

	if len(*workflowConfig) == 0 {
		log.Fatalln("No configuratio file specified. Aborting")
	}

	configs, err := common.ReadWorkflowConfigsFile(*workflowConfig)
	if err != nil {
		log.Fatalf("Error reading config file.  err: %v", err)
	}

	configuredRepos = make(map[string]*common.AutogitConfig)
	orgs := make([]string, 0, 10)
	for _, c := range configs {
		if slices.Contains(c.Workflows, "push") {
			if debugMode {
				log.Printf("  + adding org: '%s', branch: '%s', prjgit: '%s'\n", c.Organization, c.Branch, c.GitProjectName)
			}
			configuredRepos[c.Organization] = c
			orgs = append(orgs, c.Organization)
		}
	}

	gitea = common.AllocateGiteaTransport(*giteaHost)

	var defs common.ListenDefinitions

	defs.GitAuthor = "GiteaBot - AutoDevel"
	defs.RabbitURL = *rabbitUrl

	defs.Handlers = make(map[string]common.RequestProcessor)
	defs.Handlers[common.RequestType_Push] = processPushAction
	defs.Handlers[common.RequestType_Repository] = processRepositoryAction

	if err := common.RequireGiteaSecretToken(); err != nil {
		log.Fatal(err)
	}
	if err := common.RequireRabbitSecrets(); err != nil {
		log.Fatal(err)
	}
	log.Fatal(common.ProcessRabbitMQEvents(defs, orgs))
}