package buildqueue

import (
	"brunel/config"
	"brunel/domain"
	"brunel/helpers"
	"brunel/packages"
	"context"
	"fmt"
	"log/slog"
	"net/http"
	"sort"
	"time"

	"golang.org/x/net/html"
)

func StartPackageQueueWorker(ctx context.Context) {
	go func() {
		for {
			select {
			case <-ctx.Done():
				return
			default:
				processPackages()
				time.Sleep(1 * time.Hour)
			}
		}
	}()
}

func StartQueueAndStatusWorker(ctx context.Context) {
	go processQueueAndStatus(ctx)
}

func processPackages() {
	if err := packages.ProcessPackages(); err != nil {
		slog.Error("unable to process packages", "error", err)
		return
	}

	packages.GetPackages().ForEach(func(k string, v domain.SourcePackage) bool {
		if !shouldBuild(v) {
			return true
		}

		state, _ := helpers.DBInst.GetBuildState(v.Name)
		if state.BuildNumber > 3 {
			return true
		}

		if state.BuildNumber > 1 && state.Type == string(domain.BuildTypeI386) {
			return true
		}

		queueBuildItem(v, state, false)
		if v.Has32bit {
			queueBuildItem(v, state, true)
		}
		return true
	})
}

func queueBuildItem(v domain.SourcePackage, state domain.BuildState, isI386 bool) {
	buildItem := createBuildItem(v, state, isI386)
	if err := Add(buildItem); err != nil {
		slog.Info("unable to add package to queue", "error", err)
	}
}

func createBuildItem(v domain.SourcePackage, state domain.BuildState, isI386 bool) domain.BuildQueueItem {
	buildVersion := v.NewVersion
	if buildVersion == "" {
		buildVersion = v.Version
	}

	var typ domain.BuildType
	if isI386 {
		typ = domain.BuildTypeI386
	} else {
		typ = domain.BuildTypeLTO
		if state.BuildNumber == 1 {
			typ = domain.BuildTypeNormal
		} else if state.BuildNumber == 2 {
			typ = domain.BuildTypeAmd64
		}
	}

	return domain.BuildQueueItem{
		Source:       v,
		Status:       domain.Queued,
		Type:         typ,
		Patch:        false,
		Rebuild:      false,
		BuildNumber:  state.BuildNumber,
		BuildVersion: buildVersion,
	}
}
func shouldBuild(v domain.SourcePackage) bool {
	return v.Status == domain.Missing || v.Status == domain.Stale || v.Status == domain.Error
}

func processQueueAndStatus(ctx context.Context) {
	for {
		select {
		case <-ctx.Done():
			return
		default:
			processQueue()
			time.Sleep(10 * time.Second)
		}
	}
}

func processQueue() {
	q := GetQueue()
	itemsToRemove := []struct {
		name      string
		buildType domain.BuildType
	}{}
	buildingFound := false

	q.ForEach(func(k string, item domain.BuildQueueItem) bool {
		if item.Status == domain.Building {
			buildingFound = true
			complete, err := checkIfBuildComplete(item)
			if complete {
				handleCompletedBuild(item, err)
				itemsToRemove = append(itemsToRemove, struct {
					name      string
					buildType domain.BuildType
				}{
					name:      item.Source.Name,
					buildType: item.Type,
				})
			}
		}
		return true
	})

	for _, item := range itemsToRemove {
		Remove(item.name, item.buildType)
	}

	if !buildingFound {
		if err := ProcessNext(); err != nil {
			slog.Error("unable to process queue", "error", err)
		}
	}
}

func handleCompletedBuild(item domain.BuildQueueItem, err error) {
	status := domain.Built
	if err != nil {
		status = domain.Error
	}

	if item.Type != domain.BuildTypeI386 {
		if err != nil {
			item.Source.BuildAttempts++
		} else {
			item.Source.BuildAttempts = 0
			item.Source.Version = item.BuildVersion
		}

		item.Source.Status = status
		item.Source.LastBuildStatus = status
		updatePackageStatus(&item, status)
		packages.UpdateSourcePackage(item.Source)
	}

	updateBuildState(item, status)
}

func updatePackageStatus(item *domain.BuildQueueItem, status domain.PackageStatus) {
	item.Source.Packages.ForEach(func(k string, v domain.PackageInfo) bool {
		v.Status = status
		if status == domain.Current {
			v.Version = item.BuildVersion
			v.NewVersion = ""
		}
		item.Source.Packages.Set(k, v)
		return true
	})
}

func updateBuildState(item domain.BuildQueueItem, buildStatus domain.PackageStatus) {
	state, err := helpers.DBInst.GetBuildState(item.Source.Name)
	if err != nil {
		state = domain.BuildState{
			Name:         item.Source.Name,
			Status:       string(domain.Queued),
			BuildVersion: item.BuildVersion,
			Type:         string(item.Type),
			BuildNumber:  0,
		}
	}
	state.Status = string(buildStatus)
	state.Type = string(item.Type)
	state.BuildVersion = item.BuildVersion
	if state.Status == string(domain.Built) {
		state.BuildNumber = 0
	} else {
		state.BuildNumber++
	}
	helpers.DBInst.UpdateBuildState(state)
}

func checkIfBuildComplete(item domain.BuildQueueItem) (bool, error) {
	builds, err := fetchBuilds(item.Source.Name + "=" + item.BuildVersion)
	if err != nil {
		return false, err
	}

	if len(builds) == 0 {
		slog.Info("No matching builds found", "buildName", item.Source.Name+"="+item.BuildVersion)
		return false, nil
	}

	mostRecentBuild := builds[0]
	switch mostRecentBuild.status {
	case "Success":
		return true, nil
	case "Failure":
		return true, fmt.Errorf("build failed")
	case "Running", "Queued", "Waiting":
		return false, nil
	default:
		slog.Warn("Unknown build status", "status", mostRecentBuild.status)
		return false, fmt.Errorf("unknown build status: %s", mostRecentBuild.status)
	}
}

func fetchBuilds(buildName string) ([]build, error) {
	resp, err := http.Get(config.Configs.ActionsUrl)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	doc, err := html.Parse(resp.Body)
	if err != nil {
		return nil, err
	}

	var builds []build
	var f func(*html.Node)
	f = func(n *html.Node) {
		if n.Type == html.ElementNode && n.Data == "div" {
			for _, a := range n.Attr {
				if a.Key == "class" && a.Val == "flex-item tw-items-center" {
					if b := parseBuildBlock(n, buildName); b != nil {
						builds = append(builds, *b)
					}
				}
			}
		}
		for c := n.FirstChild; c != nil; c = c.NextSibling {
			f(c)
		}
	}
	f(doc)

	sort.Slice(builds, func(i, j int) bool {
		return builds[i].time.After(builds[j].time)
	})

	return builds, nil
}

type build struct {
	status string
	time   time.Time
}

func parseBuildBlock(n *html.Node, buildName string) *build {
	var title, status string
	var buildTime time.Time

	var f func(*html.Node)
	f = func(n *html.Node) {
		if n.Type == html.ElementNode {
			switch n.Data {
			case "a":
				for _, a := range n.Attr {
					if a.Key == "class" && a.Val == "flex-item-title" {
						for _, attr := range n.Attr {
							if attr.Key == "title" {
								title = attr.Val
							}
						}
					}
				}
			case "div":
				for _, a := range n.Attr {
					if a.Key == "class" && a.Val == "flex-item-leading" {
						for c := n.FirstChild; c != nil; c = c.NextSibling {
							if c.Type == html.ElementNode && c.Data == "span" {
								for _, attr := range c.Attr {
									if attr.Key == "data-tooltip-content" {
										status = attr.Val
									}
								}
							}
						}
					}
				}
			case "relative-time":
				for _, a := range n.Attr {
					if a.Key == "datetime" {
						buildTime, _ = time.Parse(time.RFC3339, a.Val)
					}
				}
			}
		}
		for c := n.FirstChild; c != nil; c = c.NextSibling {
			f(c)
		}
	}
	f(n)

	if title == buildName {
		return &build{status: status, time: buildTime}
	}
	return nil
}