// internal/download/jobs.go
package download

import (
	"app/shelfly/internal/debridlink"
	"context"
	"encoding/json"
	"net/http"
	"strconv"
	"sync"
	"time"

	"github.com/gorilla/mux"
	"gorm.io/gorm"
)

type DownloadJob struct {
	ID         uint      `gorm:"primaryKey"`
	RemoteID   string    `gorm:"index"`
	FileName   string    `gorm:"size:255"`
	Status     string    `gorm:"size:50"`
	Speed      string    `gorm:"size:50"`
	StreamURL  string    `gorm:"-" json:"stream_url"`
	ErrorMsg   string    `gorm:"-" json:"error_msg"`
	CreatedAt  time.Time `gorm:"autoCreateTime"`
	UpdatedAt  time.Time `gorm:"autoUpdateTime"`
	Link string `gorm:"size:512"`

}

var (
	jobs   = make(map[string]*DownloadJob)
	jobsMu sync.Mutex
)
func AddJob(link string, pathID uint, db *gorm.DB) *DownloadJob {
	id := time.Now().UnixNano()
	job := &DownloadJob{
		ID:        uint(id),
		Link:      link, // ← important !
		RemoteID:  "",
		FileName:  extractFileName(link),
		Status:    "added",
		Speed:     "",
		CreatedAt: time.Now(),
		UpdatedAt: time.Now(),
	}
	jobsMu.Lock()
	jobs[strconv.FormatUint(uint64(id), 10)] = job
	jobsMu.Unlock()

	db.Create(job)
	return job
}



func startDownload(job *DownloadJob, link string, client *debridlink.Client, db *gorm.DB) {
	ctx := context.Background()
	job.Status = "downloading"
	linkResp, err := client.AddLink(ctx, link)
	if err != nil {
		job.Status = "error"
		job.ErrorMsg = err.Error()
		db.Save(job)
		return
	}
	job.RemoteID = linkResp.ID
	db.Save(job)
	go syncDownloadStatus(job, client, db)
}

func syncDownloadStatus(job *DownloadJob, client *debridlink.Client, db *gorm.DB) {
	ctx := context.Background()
	var checkCount int
	for {
		if job.Status != "downloading" {
			return
		}
		links, err := client.ListLinks(ctx)
		if err != nil {
			job.Status = "error"
			job.ErrorMsg = err.Error()
			db.Save(job)
			return
		}
		for _, l := range links {
			if l.ID == job.RemoteID {
				job.Status = l.Status
				checkCount++
				if checkCount%2 == 0 {
					job.Speed = "~2 MB/s"
				} else {
					job.Speed = "~1.4 MB/s"
				}
				if l.Status == "downloaded" {
					files, err := client.ListFiles(ctx, l.ID)
					if err == nil && len(files) > 0 {
						transcodeID, err := client.CreateTranscode(ctx, files[0].ID, "original")
						if err == nil {
							job.StreamURL = "https://debrid-link.com/stream/" + transcodeID
						}
					}
				}
				db.Save(job)
				if l.Status == "downloaded" || l.Status == "error" {
					_ = client.RemoveLinks(ctx, []string{l.ID})
					return
				}
			}
		}
		time.Sleep(2 * time.Second)
	}
}

func ListJobs() []*DownloadJob {
	jobsMu.Lock()
	defer jobsMu.Unlock()
	var list []*DownloadJob
	for _, job := range jobs {
		list = append(list, job)
	}
	return list
}

func PauseJob(id string) {
	jobsMu.Lock()
	defer jobsMu.Unlock()
	if job, ok := jobs[id]; ok && job.Status == "downloading" {
		job.Status = "paused"
	}
}

func ResumeJob(id string, client *debridlink.Client, db *gorm.DB) {
	jobsMu.Lock()
	defer jobsMu.Unlock()
	if job, ok := jobs[id]; ok && job.Status == "paused" {
		job.Status = "downloading"
		db.Save(job)
		go syncDownloadStatus(job, client, db)
	}
}

func DeleteJob(id string) {
	jobsMu.Lock()
	defer jobsMu.Unlock()
	delete(jobs, id)
}

func generateID() string {
	return time.Now().Format("20060102150405.000")
}

func extractFileName(link string) string {
	return "file_from_" + link
}




func HandleListJobs(w http.ResponseWriter, r *http.Request) {
	jobs := ListJobs()
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(jobs)
}

func HandlePauseJob(w http.ResponseWriter, r *http.Request) {
	id := mux.Vars(r)["id"]
	PauseJob(id)
	w.WriteHeader(http.StatusNoContent)
}

func HandleResumeJob(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		client := debridlink.NewClient(db)
		account := getFirstActiveAccount(client)
		if account == nil {
			http.Error(w, "Aucun compte actif", http.StatusBadRequest)
			return
		}
		client.SetAccount(account)
		ResumeJob(id, client, db)
		w.WriteHeader(http.StatusNoContent)
	}
}

func HandleDeleteJob(w http.ResponseWriter, r *http.Request) {
	id := mux.Vars(r)["id"]
	DeleteJob(id)
	w.WriteHeader(http.StatusNoContent)
}

func getFirstActiveAccount(client *debridlink.Client) *debridlink.DebridAccount {
	ctx := context.Background()
	accounts, err := client.ListDebridAccounts(ctx)
	if err != nil {
		return nil
	}
	for _, acc := range accounts {
		if acc.IsActive {
			return &acc
		}
	}
	return nil
}
func HandleStartJob(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]

		jobsMu.Lock()
		job, exists := jobs[id]
		jobsMu.Unlock()

		if !exists {
			http.Error(w, "Job not found", http.StatusNotFound)
			return
		}

		client := debridlink.NewClient(db)
		account := getFirstActiveAccount(client)
		if account == nil {
			http.Error(w, "Aucun compte actif", http.StatusBadRequest)
			return
		}
		client.SetAccount(account)

		go startDownload(job, job.Link, client, db)

		w.WriteHeader(http.StatusNoContent)
	}
}