package hpc

import (
	"context"
	"fmt"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"text/template"
	"time"

	jsoniter "github.com/json-iterator/go"
	"github.com/pkg/errors"
	"github.com/rs/zerolog/log"
	"github.com/zeromicro/go-zero/core/logc"
	"github.com/zeromicro/go-zero/core/logx"
	clientCore "gitlink.org.cn/JointCloud/pcm-coordinator/client"
	"gitlink.org.cn/JointCloud/pcm-coordinator/internal/scheduler/service"
	"gitlink.org.cn/JointCloud/pcm-coordinator/internal/svc"
	"gitlink.org.cn/JointCloud/pcm-coordinator/internal/types"
	"gitlink.org.cn/JointCloud/pcm-coordinator/pkg/constants"
	"gitlink.org.cn/JointCloud/pcm-coordinator/pkg/models"
	"gitlink.org.cn/JointCloud/pcm-coordinator/pkg/utils"
)

type CommitHpcTaskLogic struct {
	logx.Logger
	ctx        context.Context
	svcCtx     *svc.ServiceContext
	hpcService *service.HpcService
}

type JobRequest struct {
	App         string                 `json:"app"`
	Common      CommonParams           `json:"common"`
	AppSpecific map[string]interface{} `json:"appSpecific"`
}
type CommonParams struct {
	JobName   string `json:"jobName"`
	Partition string `json:"partition"`
	Nodes     string `json:"nodes"`
	NTasks    string `json:"ntasks"`
	Time      string `json:"time,omitempty"`
	App       string `json:"app"`
}

func NewCommitHpcTaskLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CommitHpcTaskLogic {
	cache := make(map[string]interface{}, 10)
	hpcService, err := service.NewHpcService(&svcCtx.Config, svcCtx.Scheduler.HpcStorages, cache)
	if err != nil {
		return nil
	}
	return &CommitHpcTaskLogic{
		Logger:     logx.WithContext(ctx),
		ctx:        ctx,
		svcCtx:     svcCtx,
		hpcService: hpcService,
	}
}

// 新增：缓存模板对象
var templateCache = sync.Map{}

func (l *CommitHpcTaskLogic) getClusterInfo(clusterID string) (*types.ClusterInfo, *types.AdapterInfo, error) {
	var clusterInfo types.ClusterInfo
	if err := l.svcCtx.DbEngin.Table("t_cluster").Where("id = ?", clusterID).First(&clusterInfo).Error; err != nil {
		return nil, nil, fmt.Errorf("cluster query failed: %w", err)
	}

	if clusterInfo.Id == "" {
		return nil, nil, errors.New("cluster not found")
	}

	var adapterInfo types.AdapterInfo
	if err := l.svcCtx.DbEngin.Table("t_adapter").Where("id = ?", clusterInfo.AdapterId).First(&adapterInfo).Error; err != nil {
		return nil, nil, fmt.Errorf("adapter query failed: %w", err)
	}

	if adapterInfo.Id == "" {
		return nil, nil, errors.New("adapter not found")
	}

	return &clusterInfo, &adapterInfo, nil
}

// 自定义函数映射
func createFuncMap() template.FuncMap {
	return template.FuncMap{
		"regexMatch": regexMatch,
		"required":   required,
		"error":      errorHandler,
		"default":    defaultHandler,
	}
}
func extractUserError(originalErr error) error {
	// 尝试匹配模板引擎返回的错误格式
	re := regexp.MustCompile(`error calling \w+: (.*)$`)
	matches := re.FindStringSubmatch(originalErr.Error())
	if len(matches) > 1 {
		return errors.New(matches[1])
	}
	return originalErr
}

// 正则匹配函数
func regexMatch(pattern string) *regexp.Regexp {
	return regexp.MustCompile(pattern)
}

// 必填字段检查
func required(msg string, val interface{}) (interface{}, error) {
	if val == nil || val == "" {
		return nil, errors.New(msg)
	}
	return val, nil
}

// 错误处理函数
func errorHandler(msg string) (string, error) {
	return "", errors.New(msg)
}

// 默认值处理函数
func defaultHandler(defaultVal interface{}, val interface{}) interface{} {
	switch v := val.(type) {
	case nil:
		return defaultVal
	case string:
		if v == "" {
			return defaultVal
		}
	case int:
		if v == 0 {
			return defaultVal
		}
		// 可根据需要添加其他类型判断
	}
	return val
}
func (l *CommitHpcTaskLogic) RenderJobScript(templateContent string, req *JobRequest) (string, error) {
	// 使用缓存模板
	tmpl, ok := templateCache.Load(templateContent)
	if !ok {
		parsedTmpl, err := template.New("slurmTemplate").Funcs(createFuncMap()).Parse(templateContent)
		if err != nil {
			return "", err
		}
		templateCache.Store(templateContent, parsedTmpl)
		tmpl = parsedTmpl
	}

	params := map[string]interface{}{
		"Common": req.Common,
		"App":    req.AppSpecific,
	}

	var buf strings.Builder
	if err := tmpl.(*template.Template).Execute(&buf, params); err != nil {
		log.Error().Err(err).Msg("模板渲染失败")
		return "", extractUserError(err)
	}
	return buf.String(), nil
}

func ConvertToJobRequest(job *types.CommitHpcTaskReq) (JobRequest, error) {
	required := []string{"jobName", "nodes", "ntasks"}
	for _, field := range required {
		if job.Parameters[field] == "" {
			return JobRequest{}, fmt.Errorf("%s is empty", field)
		}
	}

	return JobRequest{
		App: job.App,
		Common: CommonParams{
			JobName:   job.Parameters["jobName"],
			Partition: job.Parameters["partition"],
			Nodes:     job.Parameters["nodes"],
			NTasks:    job.Parameters["ntasks"],
			Time:      job.Parameters["time"],
			App:       job.App,
		},
		AppSpecific: utils.MpaStringToInterface(job.Parameters),
	}, nil
}

func (l *CommitHpcTaskLogic) SaveHpcTaskToDB(req *types.CommitHpcTaskReq, jobScript, jobId, workDir string) (taskId string, err error) {
	// 使用事务确保数据一致性
	tx := l.svcCtx.DbEngin.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
			err = fmt.Errorf("transaction panic: %v", r)
		} else if err != nil {
			tx.Rollback()
		}
	}()

	userID, _ := strconv.ParseInt(req.Parameters[constants.UserId], 10, 64)
	taskID := utils.GenSnowflakeID()

	taskModel := models.Task{
		Id:              taskID,
		Name:            req.Name,
		Description:     req.Description,
		CommitTime:      time.Now(),
		Status:          constants.StatusSaved,
		AdapterTypeDict: constants.AdapterTypeHPC,
		UserId:          userID,
		UserName:        req.Parameters[constants.UserName],
	}

	if err = tx.Table("task").Create(&taskModel).Error; err != nil {
		return "", fmt.Errorf("failed to create task: %w", err)
	}

	clusterInfo, adapterInfo, err := l.getClusterInfo(req.ClusterId)
	if err != nil {
		return "", err
	}

	paramsJSON, err := jsoniter.MarshalToString(req)
	if err != nil {
		return "", fmt.Errorf("failed to marshal parameters: %w", err)
	}
	//解析slurm脚本内容
	var resource models.ResourceSpec
	if req.Backend == string(constants.HPC_SYSTEM_SLURM) {
		parser := utils.NewSlurmParser()
		slurmResource := parser.ParseScript(jobScript)
		resource = models.ResourceSpec{
			//资源规格名称，采用拼接的方式 集群名+队列名
			ResourceName:   fmt.Sprintf("%s_%s", clusterInfo.Name, slurmResource.Partition),
			Partition:      slurmResource.Partition,
			Specifications: slurmResource,
		}
	}
	clusterID := utils.StringToInt64(clusterInfo.Id)
	hpcTask := models.TaskHpc{
		Id:           utils.GenSnowflakeID(),
		TaskId:       taskID,
		AdapterId:    clusterInfo.AdapterId,
		AdapterName:  adapterInfo.Name,
		ClusterId:    clusterID,
		ClusterName:  clusterInfo.Name,
		Name:         taskModel.Name,
		Backend:      req.Backend,
		OperateType:  req.OperateType,
		CmdScript:    req.Parameters["cmdScript"],
		WallTime:     req.Parameters["wallTime"],
		AppType:      req.Parameters["appType"],
		AppName:      req.App,
		Queue:        req.Parameters["queue"],
		SubmitType:   req.Parameters["submitType"],
		NNode:        req.Parameters["nNode"],
		Account:      clusterInfo.Username,
		StdInput:     req.Parameters["stdInput"],
		Partition:    req.Parameters["partition"],
		CreatedTime:  time.Now(),
		UpdatedTime:  time.Now(),
		Status:       constants.StatusDeploying,
		UserId:       userID,
		Params:       paramsJSON,
		Script:       jobScript,
		JobId:        jobId,
		WorkDir:      workDir,
		ResourceSpec: resource,
	}

	if err = tx.Table("task_hpc").Create(&hpcTask).Error; err != nil {
		return "", fmt.Errorf("failed to create HPC task: %w", err)
	}

	noticeInfo := clientCore.NoticeInfo{
		AdapterId:   clusterInfo.AdapterId,
		AdapterName: adapterInfo.Name,
		ClusterId:   clusterID,
		ClusterName: clusterInfo.Name,
		NoticeType:  "create",
		TaskName:    req.Name,
		TaskId:      taskID,
		Incident:    "任务创建中",
		CreatedTime: time.Now(),
	}

	if err = tx.Table("t_notice").Create(&noticeInfo).Error; err != nil {
		return "", fmt.Errorf("failed to create notice: %w", err)
	}

	if err = tx.Commit().Error; err != nil {
		return "", fmt.Errorf("transaction commit failed: %w", err)
	}

	return utils.Int64ToString(taskID), nil
}

func (l *CommitHpcTaskLogic) CommitHpcTask(req *types.CommitHpcTaskReq) (resp *types.CommitHpcTaskResp, err error) {
	reqJSON, err := jsoniter.MarshalToString(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}
	logc.Infof(l.ctx, "提交超算任务请求参数: %s", reqJSON)

	jobName := generateJobName(req)
	req.Parameters["jobName"] = jobName

	// 获取集群和适配器信息
	clusterInfo, adapterInfo, err := l.getClusterInfo(req.ClusterId)
	if err != nil {
		return nil, err
	}
	scriptContent := req.ScriptContent
	if scriptContent == "" {
		// 获取模板
		var templateInfo types.HpcAppTemplateInfo
		tx := l.svcCtx.DbEngin.Table("hpc_app_template").
			Where("cluster_id = ? and app = ? ", req.ClusterId, req.App)
		if req.OperateType != "" {
			tx.Where("app_type = ?", req.OperateType)
		}
		if err := tx.First(&templateInfo).Error; err != nil {
			return nil, fmt.Errorf("获取HPC应用【%s】模板失败: %w", req.App, err)
		}

		// 转换请求参数
		jobRequest, err := ConvertToJobRequest(req)
		if err != nil {
			return nil, err
		}

		// 渲染脚本
		script, err := l.RenderJobScript(templateInfo.Content, &jobRequest)
		if err != nil {
			return nil, err
		}
		scriptContent = script
	}

	q, _ := jsoniter.MarshalToString(scriptContent)
	submitQ := types.SubmitHpcTaskReq{
		App:           req.App,
		ClusterId:     req.ClusterId,
		JobName:       jobName,
		ScriptContent: scriptContent,
		Parameters:    req.Parameters,
		Backend:       req.Backend,
	}
	log.Info().Msgf("Submitting HPC task to cluster %s with params: %s", clusterInfo.Name, q)
	resp, err = l.hpcService.HpcExecutorAdapterMap[adapterInfo.Id].SubmitTask(l.ctx, submitQ)
	if err != nil {
		log.Error().Err(err).Msgf("提交超算任务失败, cluster: %s, jobName: %s, scriptContent: %s", clusterInfo.Name, jobName, scriptContent)
		return nil, fmt.Errorf("网络请求失败，请稍后重试")
	}

	jobID := resp.Data.JobInfo["jobId"]
	workDir := resp.Data.JobInfo["jobDir"]
	taskID, err := l.SaveHpcTaskToDB(req, scriptContent, jobID, workDir)
	if err != nil {
		log.Error().Msgf("超算任务保存到数据库失败, cluster: %s, jobName: %s, scriptContent: %s, error: %v", clusterInfo.Name, jobName, scriptContent, err)
		return nil, fmt.Errorf("保存超算任务到数据库失败: %w", err)
	}

	resp.Data.JobInfo["taskId"] = taskID
	return resp, nil
}

func generateJobName(req *types.CommitHpcTaskReq) string {
	if req.OperateType == "" {
		return req.Name
	}
	return req.Name + "_" + req.OperateType
}