package api

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httputil"
	"strconv"

	"github.com/vmware/harbor/api"
	"github.com/vmware/harbor/dao"
	"github.com/vmware/harbor/job"
	"github.com/vmware/harbor/job/config"
	"github.com/vmware/harbor/job/utils"
	"github.com/vmware/harbor/models"
	"github.com/vmware/harbor/utils/log"
)

// ReplicationJob handles /api/replicationJobs /api/replicationJobs/:id/log
// /api/replicationJobs/actions
type ReplicationJob struct {
	api.BaseAPI
}

// ReplicationReq holds informations of request for /api/replicationJobs
type ReplicationReq struct {
	PolicyID  int64    `json:"policy_id"`
	Repo      string   `json:"repository"`
	Operation string   `json:"operation"`
	TagList   []string `json:"tags"`
}

// Post creates replication jobs according to the policy.
func (rj *ReplicationJob) Post() {
	var data ReplicationReq
	rj.DecodeJSONReq(&data)
	log.Debugf("data: %+v", data)
	p, err := dao.GetRepPolicy(data.PolicyID)
	if err != nil {
		log.Errorf("Failed to get policy, error: %v", err)
		rj.RenderError(http.StatusInternalServerError, fmt.Sprintf("Failed to get policy, id: %d", data.PolicyID))
		return
	}
	if p == nil {
		log.Errorf("Policy not found, id: %d", data.PolicyID)
		rj.RenderError(http.StatusNotFound, fmt.Sprintf("Policy not found, id: %d", data.PolicyID))
		return
	}
	if len(data.Repo) == 0 { // sync all repositories
		repoList, err := getRepoList(p.ProjectID)
		if err != nil {
			log.Errorf("Failed to get repository list, project id: %d, error: %v", p.ProjectID, err)
			rj.RenderError(http.StatusInternalServerError, err.Error())
			return
		}
		log.Debugf("repo list: %v", repoList)
		for _, repo := range repoList {
			err := rj.addJob(repo, data.PolicyID, models.RepOpTransfer)
			if err != nil {
				log.Errorf("Failed to insert job record, error: %v", err)
				rj.RenderError(http.StatusInternalServerError, err.Error())
				return
			}
		}
	} else { // sync a single repository
		var op string
		if len(data.Operation) > 0 {
			op = data.Operation
		} else {
			op = models.RepOpTransfer
		}
		err := rj.addJob(data.Repo, data.PolicyID, op, data.TagList...)
		if err != nil {
			log.Errorf("Failed to insert job record, error: %v", err)
			rj.RenderError(http.StatusInternalServerError, err.Error())
			return
		}
	}
}

func (rj *ReplicationJob) addJob(repo string, policyID int64, operation string, tags ...string) error {
	j := models.RepJob{
		Repository: repo,
		PolicyID:   policyID,
		Operation:  operation,
		TagList:    tags,
	}
	log.Debugf("Creating job for repo: %s, policy: %d", repo, policyID)
	id, err := dao.AddRepJob(j)
	if err != nil {
		return err
	}
	log.Debugf("Send job to scheduler, job id: %d", id)
	job.Schedule(id)
	return nil
}

// RepActionReq holds informations of request for /api/replicationJobs/actions
type RepActionReq struct {
	PolicyID int64  `json:"policy_id"`
	Action   string `json:"action"`
}

// HandleAction supports some operations to all the jobs of one policy
func (rj *ReplicationJob) HandleAction() {
	var data RepActionReq
	rj.DecodeJSONReq(&data)
	//Currently only support stop action
	if data.Action != "stop" {
		log.Errorf("Unrecognized action: %s", data.Action)
		rj.RenderError(http.StatusBadRequest, fmt.Sprintf("Unrecongized action: %s", data.Action))
		return
	}
	jobs, err := dao.GetRepJobToStop(data.PolicyID)
	if err != nil {
		log.Errorf("Failed to get jobs to stop, error: %v", err)
		rj.RenderError(http.StatusInternalServerError, "Faild to get jobs to stop")
		return
	}
	var jobIDList []int64
	for _, j := range jobs {
		jobIDList = append(jobIDList, j.ID)
	}
	job.WorkerPool.StopJobs(jobIDList)
}

// GetLog gets logs of the job
func (rj *ReplicationJob) GetLog() {
	idStr := rj.Ctx.Input.Param(":id")
	jid, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		log.Errorf("Error parsing job id: %s, error: %v", idStr, err)
		rj.RenderError(http.StatusBadRequest, "Invalid job id")
		return
	}
	logFile := utils.GetJobLogPath(jid)
	rj.Ctx.Output.Download(logFile)
}

// calls the api from UI to get repo list
func getRepoList(projectID int64) ([]string, error) {
	/*
		uiUser := os.Getenv("UI_USR")
		if len(uiUser) == 0 {
			uiUser = "admin"
		}
		uiPwd := os.Getenv("UI_PWD")
		if len(uiPwd) == 0 {
			uiPwd = "Harbor12345"
		}
	*/
	uiURL := config.LocalHarborURL()
	client := &http.Client{}
	req, err := http.NewRequest("GET", uiURL+"/api/repositories?project_id="+strconv.Itoa(int(projectID)), nil)
	if err != nil {
		log.Errorf("Error when creating request: %v", err)
		return nil, err
	}
	//req.SetBasicAuth(uiUser, uiPwd)
	req.AddCookie(&http.Cookie{Name: models.UISecretCookie, Value: config.UISecret()})
	//dump, err := httputil.DumpRequest(req, true)
	//log.Debugf("req: %q", dump)
	resp, err := client.Do(req)
	if err != nil {
		log.Errorf("Error when calling UI api to get repositories, error: %v", err)
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		log.Errorf("Unexpected status code: %d", resp.StatusCode)
		dump, _ := httputil.DumpResponse(resp, true)
		log.Debugf("response: %q", dump)
		return nil, fmt.Errorf("Unexpected status code when getting repository list: %d", resp.StatusCode)
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Errorf("Failed to read the response body, error: %v", err)
		return nil, err
	}
	var repoList []string
	err = json.Unmarshal(body, &repoList)
	return repoList, err
}