package main

import (
	"context"
	"slices"
	"strings"
	"sync"
	"time"

	"github.com/redis/go-redis/v9"
	"src.opensuse.org/autogits/common"
)

var RepoStatus []*common.BuildResult = []*common.BuildResult{}
var RepoStatusLock *sync.RWMutex = &sync.RWMutex{}

var redisClient *redis.Client

func RedisConnect(RedisUrl string) {
	opts, err := redis.ParseURL(RedisUrl)
	if err != nil {
		panic(err)
	}

	redisClient = redis.NewClient(opts)
}

func UpdateResults(r *common.BuildResult) {
	RepoStatusLock.Lock()
	defer RepoStatusLock.Unlock()

	key := "result." + r.Project + "/" + r.Repository + "/" + r.Arch
	common.LogDebug(" + Updating", key)
	data, err := redisClient.HGetAll(context.Background(), key).Result()
	if err != nil {
		common.LogError("Failed fetching build results for", key, err)
	}
	common.LogDebug(" + Update size", len(data))

	reset_time := time.Date(1000, 1, 1, 1, 1, 1, 1, time.Local)
	for _, pkg := range r.Status {
		pkg.LastUpdate = reset_time
	}
	r.LastUpdate = time.Now()
	for pkg, result := range data {
		if strings.HasPrefix(result, "scheduled") {
			// TODO: lookup where's building
			result = "building"
		}

		var idx int
		var found bool
		var code string
		var details string

		if pos := strings.IndexByte(result, ':'); pos > -1 && pos < len(result) {
			code = result[0:pos]
			details = result[pos+1:]
		} else {
			code = result
			details = ""
		}

		if idx, found = slices.BinarySearchFunc(r.Status, &common.PackageBuildStatus{Package: pkg}, common.PackageBuildStatusComp); found {
			res := r.Status[idx]
			res.LastUpdate = r.LastUpdate
			res.Code = code
			res.Details = details
		} else {
			r.Status = slices.Insert(r.Status, idx, &common.PackageBuildStatus{
				Package:    pkg,
				Code:       code,
				Details:    details,
				LastUpdate: r.LastUpdate,
			})
		}
	}
	for idx := 0; idx < len(r.Status); {
		if r.Status[idx].LastUpdate == reset_time {
			r.Status = slices.Delete(r.Status, idx, idx+1)
		} else {
			idx++
		}
	}
}

func FindProjectResults(project string) []*common.BuildResult {
	RepoStatusLock.RLock()
	defer RepoStatusLock.RUnlock()

	ret := make([]*common.BuildResult, 0, 8)
	idx, _ := slices.BinarySearchFunc(RepoStatus, &common.BuildResult{Project: project}, common.BuildResultComp)
	for idx < len(RepoStatus) && RepoStatus[idx].Project == project {
		ret = append(ret, RepoStatus[idx])
		idx++
	}
	return ret
}

func FindRepoResults(project, repo string) []*common.BuildResult {
	RepoStatusLock.RLock()
	defer RepoStatusLock.RUnlock()

	ret := make([]*common.BuildResult, 0, 8)
	idx, _ := slices.BinarySearchFunc(RepoStatus, &common.BuildResult{Project: project, Repository: repo}, common.BuildResultComp)
	for idx < len(RepoStatus) && RepoStatus[idx].Project == project && RepoStatus[idx].Repository == repo {
		ret = append(ret, RepoStatus[idx])
		idx++
	}
	return ret
}

func FindAndUpdateProjectResults(project string) []*common.BuildResult {
	res := FindProjectResults(project)
	wg := &sync.WaitGroup{}
	now := time.Now()
	for _, r := range res {
		if now.Sub(r.LastUpdate).Abs() < time.Second*10 {
			// 1 update per 10 second for now
			continue
		}
		wg.Add(1)
		go func() {
			UpdateResults(r)
			wg.Done()
		}()
	}
	wg.Wait()
	return res
}

func FindAndUpdateRepoResults(project, repo string) []*common.BuildResult {
	res := FindRepoResults(project, repo)
	wg := &sync.WaitGroup{}
	now := time.Now()
	for _, r := range res {
		if now.Sub(r.LastUpdate).Abs() < time.Second*10 {
			// 1 update per 10 second for now
			continue
		}
		wg.Add(1)
		go func() {
			UpdateResults(r)
			wg.Done()
		}()
	}
	wg.Wait()
	return res
}

func RescanRepositories() error {
	ctx := context.Background()
	var cursor uint64
	var err error

	common.LogDebug("** starting rescanning ...")
	RepoStatusLock.Lock()
	for _, repo := range RepoStatus {
		repo.Dirty = false
	}
	RepoStatusLock.Unlock()
	var count int

	for {
		var data []string
		data, cursor, err = redisClient.ScanType(ctx, cursor, "", 1000, "hash").Result()

		if err != nil {
			return err
		}

		RepoStatusLock.Lock()
		for _, repo := range data {
			r := strings.Split(repo, "/")
			if len(r) != 3 || len(r[0]) < 8 || r[0][0:7] != "result." {
				continue
			}
			d := &common.BuildResult{
				Project:    r[0][7:],
				Repository: r[1],
				Arch:       r[2],
			}
			if pos, found := slices.BinarySearchFunc(RepoStatus, d, common.BuildResultComp); found {
				RepoStatus[pos].Dirty = true
			} else {
				d.Dirty = true
				RepoStatus = slices.Insert(RepoStatus, pos, d)
				count++
			}
		}
		RepoStatusLock.Unlock()

		if cursor == 0 {
			break
		}
	}
	common.LogDebug("  added a total", count, "repos")
	count = 0

	RepoStatusLock.Lock()
	for i := 0; i < len(RepoStatus); {
		if !RepoStatus[i].Dirty {
			RepoStatus = slices.Delete(RepoStatus, i, i+1)
			count++
		} else {
			i++
		}
	}
	RepoStatusLock.Unlock()
	common.LogDebug("  removed", count, "repos")
	common.LogDebug("  total repos:", len(RepoStatus))

	return nil
}