package controller

import (
	"archive/zip"
	"bufio"
	"context"
	"errors"
	"flink-kube-operator/internal/crd"
	"flink-kube-operator/internal/crd/v1alpha1"
	"flink-kube-operator/internal/managed_job"
	"flink-kube-operator/internal/rest/types"
	"flink-kube-operator/pkg"
	"fmt"
	"io"
	"os"
	"path/filepath"

	"github.com/danielgtaylor/huma/v2"
	"go.uber.org/zap"
	k8sTypes "k8s.io/apimachinery/pkg/types"
)

type GetJobsReq struct {
}

type GetJobsResp struct {
	Body []v1alpha1.FlinkJob
}

func GetJobs(ctx context.Context, req *GetJobsReq) (*GetJobsResp, error) {
	jobs := []v1alpha1.FlinkJob{}
	for _, key := range crd.GetAllJobKeys() {
		job := crd.GetJob(key)
		job.ManagedFields = nil
		jobs = append(jobs, job)
	}
	return &GetJobsResp{Body: jobs}, nil
}

type StopJobReq struct {
	JobUId string `path:"uid"`
}

type StopJobRespBody struct {
	Success bool `json:"success"`
}

type StopJobResp struct {
	Body StopJobRespBody
}

func StopJob(ctx context.Context, req *StopJobReq) (*StopJobResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	err := job.Stop()
	if err != nil {
		return nil, err
	}
	return &StopJobResp{Body: StopJobRespBody{
		Success: true,
	}}, nil
}

func StartJob(ctx context.Context, req *StopJobReq) (*StopJobResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	err := job.Run(false)
	if err != nil {
		return nil, err
	}
	return &StopJobResp{Body: StopJobRespBody{
		Success: true,
	}}, nil
}

func ResumeJob(ctx context.Context, req *StopJobReq) (*StopJobResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	err := job.Run(true)
	if err != nil {
		return nil, err
	}
	return &StopJobResp{Body: StopJobRespBody{
		Success: true,
	}}, nil
}

func RemoveJobJar(ctx context.Context, req *StopJobReq) (*StopJobResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	job.RemoveJar()
	return &StopJobResp{Body: StopJobRespBody{
		Success: true,
	}}, nil
}

func PauseJob(ctx context.Context, req *StopJobReq) (*StopJobResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	job.Pause()
	return &StopJobResp{Body: StopJobRespBody{
		Success: true,
	}}, nil
}

type JobTriggerSavepointReq struct {
	JobUId string `path:"uid"`
}

type JobTriggerSavepointRespBody struct {
	Success bool `json:"success"`
}

type JobTriggerSavepointResp struct {
	Body JobTriggerSavepointRespBody
}

func TriggerSavepoint(ctx context.Context, req *JobTriggerSavepointReq) (*JobTriggerSavepointResp, error) {
	mgr := managed_job.GetManager()
	job := mgr.GetJob(k8sTypes.UID(req.JobUId))
	err := job.TriggerSavepoint()
	if err != nil {
		return nil, err
	}
	return &JobTriggerSavepointResp{Body: JobTriggerSavepointRespBody{
		Success: true,
	}}, nil
}

func DownloadSavepoint(ctx context.Context, req *types.SavepointDownloadReq) (*huma.StreamResponse, error) {
	folderPath := req.SavepointPath // Change this to your folder path

	// Create a temporary zip file
	zipFilePath, err := filepath.Abs("./savepoint.zip")

	pkg.Logger.Debug("[controller] [savepoint]",
		zap.String("zipFileName", zipFilePath),
		zap.String("folderPath", folderPath),
	)

	// Create the zip file
	zipFile, err := os.Create(zipFilePath)
	if err != nil {
		fmt.Println("Error creating zip file:", err)
		return nil, nil
	}
	defer zipFile.Close()

	// Create a new zip writer
	zipWriter := zip.NewWriter(zipFile)
	defer zipWriter.Close()

	// Walk through the source directory and add files to the zip
	err = filepath.Walk(folderPath, func(filePath string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Create a new file header
		header, err := zip.FileInfoHeader(info)
		if err != nil {
			return err
		}

		// Set the header name to the relative path
		header.Name, err = filepath.Rel(folderPath, filePath)
		if err != nil {
			return err
		}

		// If it's a directory, add a trailing slash
		if info.IsDir() {
			header.Name += "/"
		} else {
			// Set the compression method
			header.Method = zip.Deflate
		}

		// Create a new writer for the file
		writer, err := zipWriter.CreateHeader(header)
		if err != nil {
			return err
		}

		// If it's a directory, we're done
		if info.IsDir() {
			return nil
		}

		// Open the file to be zipped
		file, err := os.Open(filePath)
		if err != nil {
			return err
		}
		defer file.Close()

		// Copy the file content to the zip writer
		_, err = io.Copy(writer, file)
		return err
	})

	// Open the zip file for reading
	zipFileReader, err := os.Open(zipFilePath)
	if err != nil {
		return nil, fmt.Errorf("failed to open zip file: %w", err)
	}
	//defer zipFileReader.Close()

	fileInfo, err := zipFileReader.Stat()
	if err != nil {
		return nil, fmt.Errorf("failed to get info of zipped file: %w", err)
	}

	resp := &huma.StreamResponse{
		Body: func(ctx huma.Context) {
			ctx.SetHeader("Content-Type", "application/zip")
			ctx.SetHeader("Content-Length", fmt.Sprintf("%d", fileInfo.Size()))
			ctx.SetHeader("Content-Disposition", fmt.Sprintf("attachment; filename=%s", zipFilePath))
			writer := ctx.BodyWriter()
			br := bufio.NewReader(zipFileReader)
			for {

				b, err := br.ReadByte()

				if err != nil && !errors.Is(err, io.EOF) {
					fmt.Println(err)
					break
				}

				// process the one byte b

				if err != nil {
					// end of file
					break
				}
				writer.Write([]byte{b})
			}

			os.Remove(zipFilePath)

		},
	}

	return resp, nil
}