package main

import (
	"fmt"
	"log"
	"net/url"
	"os"
	"path"
	"regexp"
	"slices"
	"strconv"
	"strings"
	"time"

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

const (
	GitAuthor   = "GiteaBot - Obs Staging"
	BotName     = "ObsStaging"
	ObsBuildBot = "/obsbuild"

	Username = "autogits_obs_staging_bot"
)

var GiteaToken string
var runId uint

func failOnError(err error, msg string) {
	if err != nil {
		log.Panicf("%s: %s", err, msg)
	}
}

func fetchPrGit(h *common.RequestHandler, pr *models.PullRequest) error {
	// clone PR head and base and return path
	if _, err := os.Stat(path.Join(h.GitPath, pr.Head.Sha)); os.IsNotExist(err) {
		h.GitExec("", "clone", "--depth", "1", pr.Head.Repo.CloneURL, pr.Head.Sha)
		h.GitExec(pr.Head.Sha, "fetch", "--depth", "1", "origin", pr.Head.Sha, pr.Base.Sha)
	} else if err != nil {
		h.Error = err
	}

	return h.Error
}

func processPullNotification(h *common.RequestHandler, notification *models.NotificationSubject) {
	rx := regexp.MustCompile(`^https://src\.(?:open)?suse\.(?:org|de)/api/v\d+/repos/(?<org>[a-zA-Z0-9]+)/(?<project>[_a-zA-Z0-9]+)/issues/(?<num>[0-9]+)$`)
	match := rx.FindStringSubmatch(notification.URL)
	if match == nil {
		log.Panicf("Unexpected format of notification: %s", notification.URL)
	}

	h.Log("processing")
	h.Log("project: %s", match[2])
	h.Log("org:     %s", match[1])
	h.Log("number:  %s", match[3])

	org := match[1]
	repo := match[2]
	id, _ := strconv.ParseInt(match[3], 10, 64)

	pr, reviews, err := h.GetPullRequestAndReviews(org, repo, id)
	if err != nil {
		return
	}

	obsClient, err := common.NewObsClient("api.opensuse.org")
	if err != nil {
		h.LogPlainError(err)
		return
	}

	reviewRequested := false
	for _, reviewer := range pr.RequestedReviewers {
		if reviewer.UserName == Username {
			reviewRequested = true
			break
		}
	}

	if !reviewRequested {
		return
	}

	newReviews := make([]*models.PullReview, 0, len(reviews))
	for _, review := range reviews {
		if review.User.UserName == Username {
			newReviews = append(newReviews, review)
		}
	}
	reviews = newReviews

	slices.SortFunc(reviews, func(a, b *models.PullReview) int {
		return time.Time(a.Submitted).Compare(time.Time(b.Submitted))
	})

	for idx := len(reviews) - 1; idx >= 0; idx-- {
		review := reviews[idx]
		h.Log("state: %s,   body: %s,   id:%d\n", string(review.State), review.Body, review.ID)

		if review.User.UserName != "autogits_obs_staging_bot" {
			continue
		}

		err := fetchPrGit(h, pr)
		if err != nil {
			h.LogError("Cannot fetch PR git: %s", pr.URL)
			return
		}

		dir := pr.Head.Sha
		headSubmodules := h.GitSubmoduleList(dir, pr.Head.Sha)
		baseSubmodules := h.GitSubmoduleList(dir, pr.Base.Sha)

		modifiedOrNew := make([]string, 0, 16)
		for pkg, headOid := range headSubmodules {
			if baseOid, exists := baseSubmodules[pkg]; !exists || baseOid != headOid {
				modifiedOrNew = append(modifiedOrNew, pkg)
			}
		}

		// find modified submodules and new submodules -- build them

		h.Log("processing state...")

		switch review.State {
		// create build project, if doesn't exist, and add it to pending requests
		case common.ReviewStateUnknown, common.ReviewStateRequestReview:
			h.Log("repo content fetching ...")
			buildPrjBytes, err := h.GetPullRequestFileContent(pr, "project.build")
			if err != nil {
				h.LogPlainError(err)
				_, err := h.AddReviewComment(pr, common.ReviewStateRequestChanges, "Cannot find reference project")
				if err != nil {
					h.LogPlainError(err)
				}
				return
			}

			buildPrj := strings.TrimSpace(string(buildPrjBytes))
			meta, err := obsClient.GetProjectMeta(buildPrj)
			if err != nil {
				h.Log("error fetching project meta for %s: %v", buildPrj, err)
				return
			}

			// generate new project with paths pointinig back to original repos
			// disable publishing

			// TODO: escape things here
			meta.Name = fmt.Sprintf("%s:%s:%s:PR:%d",
				obsClient.HomeProject,
				common.ObsSafeProjectName(pr.Base.Repo.Owner.UserName),
				common.ObsSafeProjectName(pr.Base.Repo.Name),
				pr.Index,
			)
			meta.Description = fmt.Sprintf(`Pull request build job: %s%s PR#%d`,
				"https://src.opensuse.org", pr.Base.Repo.Name, pr.Index)
			urlPkg := make([]string, 0, len(modifiedOrNew))
			for _, pkg := range modifiedOrNew {
				urlPkg = append(urlPkg, "onlybuild="+url.QueryEscape(pkg))
			}
			meta.ScmSync = pr.Head.Repo.CloneURL + "?" + strings.Join(urlPkg, "&")
			meta.Title = fmt.Sprintf("PR#%d to %s", pr.Index, pr.Base.Name)
			meta.PublicFlags = common.Flags{Contents: "<disable/>"}

			// set paths to parent project
			for idx, r := range meta.Repositories {
				meta.Repositories[idx].Paths = []common.RepositoryPathMeta{{
					Project:    buildPrj,
					Repository: r.Name,
				}}
			}

			h.Log("%#v", meta)
			return

			err = obsClient.SetProjectMeta(meta)
			if err != nil {
				h.LogError("cannot create meta project: %#v", err)
			}

			// set the review state to pending

		case common.ReviewStatePending:
		// waiting for build results
		case common.ReviewStateApproved:
		// done, mark notification as read
		case common.ReviewStateRequestChanges:
			h.Log("processing request for failed request changes...")
			// build failures, nothing to do here, mark notification as read
		}

		break
	}
}

func pollWorkNotifications() {
	h := common.CreateRequestHandler(GitAuthor, BotName)
	data, err := h.GetNotifications(nil)

	if err != nil {
		h.LogPlainError(err)
		return
	}

	if data != nil {
		for _, notification := range data {

			switch notification.Subject.Type {
			case "Pull":
				processPullNotification(h, notification.Subject)
			default:
				h.SetNotificationRead(notification.ID)
			}
		}
	}
}

func main() {
	var defs common.ListenDefinitions

	defs.Url = ObsBuildBot
	defs.GitAuthor = GitAuthor

	failOnError(common.RequireGiteaSecretToken(), "Cannot find GITEA_TOKEN")
	failOnError(common.RequireObsSecretToken(), "Cannot find OBS_USER and OBS_PASSWORD")

	//	go ProcessingObsMessages("rabbit.opensuse.org", "opensuse", "opensuse", "")

	pollWorkNotifications()

	/*
		h := allocateRequestHandler()
		//"	autogits/_ObsPrj/raw/project.build?ref=9680b770855e4fc2e9d9cebbd87e6a0d119693c3e03db187494e3aeff727312f"
		// https://src.opensuse.org/adamm/autogits/commit/8db4d8c3021fc21baa606b87eaad0e476bb7f624f76cb37b6a1819bdb5f04b43#diff-6e698c75c21cd4458440e8a71408c6301ba3a562
		f, err := h.GetRepositoryFileContent(
			&models.Repository{
				Owner: &models.User{
					UserName: "adamm",
				},
				Name: "autogits",
			},
			"54e418acaf960c5ed8be7f4a29616ae7b5eb75f797f7ed4d487f79485d056108",
			"bots-common/obs/client.go")

		if err != nil {
			h.LogPlainError(err)
		}
		h.Log("len: %d", len(f))
	*/
	stuck := make(chan int)
	<-stuck
}