package buildqueue

import (
	"brunel/config"
	"brunel/domain"
	"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:
				err := packages.ProcessPackages()
				if err != nil {
					slog.Error("unable to process packages: " + err.Error())
				}
				packs := packages.GetPackages()
				packs.ForEach(func(k string, v domain.SourcePackage) bool {
					needsBuild := false
					buildVersion := ""
					buildAttempt := 0
					errPreviously := false
					v.Packages.ForEach(func(k string, v domain.PackageInfo) bool {
						if v.Status == domain.Current {
							return true
						}
						version := v.NewVersion
						if version == "" {
							version = v.Version
						}
						if v.LastBuildStatus == domain.Error {
							errPreviously = true
							buildAttempt = 1
						}
						if v.Status == domain.Missing {
							needsBuild = true
							buildVersion = version
							return false
						}
						if v.Status == domain.Stale {
							needsBuild = true
							buildVersion = version
							return false
						}
						return true
					})
					if needsBuild {
						typ := domain.BuildTypeLTO
						if errPreviously {
							typ = domain.BuildTypeNormal
						}
						buildItem := domain.BuildQueueItem{
							Source:       v,
							Status:       domain.Queued,
							Type:         typ,
							Patch:        false,
							Rebuild:      false,
							BuildNumber:  buildAttempt,
							BuildVersion: buildVersion,
						}
						err := Add(buildItem)
						if err != nil {
							slog.Info("unable to add package to queue: " + err.Error())
						}
					}
					return true
				})
				time.Sleep(1 * time.Hour)
			}
		}
	}()
}

func processQueueAndStatus(ctx context.Context) {
	for {
		select {
		case <-ctx.Done():
			return
		default:
			q := GetQueue()
			itemsToRemove := make([]string, 0)
			buildingFound := false

			q.ForEach(func(k string, item domain.BuildQueueItem) bool {
				if item.Status == domain.Building {
					buildingFound = true
					complete, err := CheckIfBuildComplete(ctx, item)
					if err != nil && !complete {
						slog.Error("unable to check if build is complete: " + err.Error())
					}
					if complete {
						if err != nil {
							updatePackageStatus(&item, domain.Error, domain.Error)
						} else {
							updatePackageStatus(&item, domain.Current, domain.Built)
						}
						packages.UpdateSourcePackage(item.Source)
						itemsToRemove = append(itemsToRemove, k)
					}
				}
				return true
			})

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

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

			time.Sleep(1500 * time.Millisecond)
		}
	}
}

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

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

func CheckIfBuildComplete(ctx context.Context, item domain.BuildQueueItem) (bool, error) {
	resp, err := http.Get(config.Configs.ActionsUrl)
	if err != nil {
		return false, err
	}
	defer resp.Body.Close()

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

	buildName := item.Source.Name + "=" + item.BuildVersion
	var builds []struct {
		isMatch bool
		status  string
		time    time.Time
	}

	var f func(*html.Node) error
	f = func(n *html.Node) error {
		if n.Type == html.ElementNode && n.Data == "div" {
			for _, a := range n.Attr {
				if a.Key == "class" && a.Val == "flex-item tw-items-center" {
					isMatch, status, buildTime := checkBuildBlock(n, buildName)
					if isMatch {
						builds = append(builds, struct {
							isMatch bool
							status  string
							time    time.Time
						}{isMatch, status, buildTime})
					}
				}
			}
		}
		for c := n.FirstChild; c != nil; c = c.NextSibling {
			if err := f(c); err != nil {
				return err
			}
		}
		return nil
	}

	if err := f(doc); err != nil {
		return false, err
	}

	// Sort builds by time, most recent first
	sort.Slice(builds, func(i, j int) bool {
		return builds[i].time.After(builds[j].time)
	})

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

	mostRecentBuild := builds[0]

	switch mostRecentBuild.status {
	case "Success":
		return true, nil
	case "Failure":
		return true, fmt.Errorf("build failed")
	case "Running":
		return false, nil // Build is still in progress
	case "Queued":
		return false, nil // Build is still in progress
	default:
		slog.Warn("Unknown build status", "status", mostRecentBuild.status)
		return false, fmt.Errorf("unknown build status: %s", mostRecentBuild.status)
	}
}

func checkBuildBlock(n *html.Node, buildName string) (bool, string, time.Time) {
	var title string
	var 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)

	return title == buildName, status, buildTime
}