// 定时任务执行引擎 — 供 HTTP 手动触发与后台 Cron 调度共用 // Logan.Li
package controller

import (
	"fmt"
	"time"

	"ezops/model"
	"ezops/pkg/remoteexec"
	"ezops/pkg/scriptrunner"

	"gorm.io/gorm"
)

// RunCronJobByID 执行指定定时任务并写入执行记录 // Logan.Li
func RunCronJobByID(db *gorm.DB, id uint) (*model.TaskExecution, error) {
	var job model.CronJob
	if err := db.First(&job, id).Error; err != nil {
		return nil, fmt.Errorf("定时任务不存在")
	}
	return runCronJob(db, job)
}

// QueueCronJobByID 提交一次手动执行，立即返回执行记录，后台继续执行 // Logan.Li
func QueueCronJobByID(db *gorm.DB, id uint) (*model.TaskExecution, error) {
	var job model.CronJob
	if err := db.First(&job, id).Error; err != nil {
		return nil, fmt.Errorf("定时任务不存在")
	}
	execution, startedAt, err := createCronExecution(db, job)
	if err != nil {
		return nil, err
	}
	go finishCronExecution(db, job, execution.ID, startedAt)
	return execution, nil
}

func runCronJob(db *gorm.DB, job model.CronJob) (*model.TaskExecution, error) {
	execution, startedAt, err := createCronExecution(db, job)
	if err != nil {
		return nil, err
	}
	finishCronExecution(db, job, execution.ID, startedAt)
	_ = db.First(execution, execution.ID).Error
	return execution, nil
}

func createCronExecution(db *gorm.DB, job model.CronJob) (*model.TaskExecution, time.Time, error) {
	startedAt := time.Now()
	execution := &model.TaskExecution{
		TaskType:   "cron",
		TaskID:     job.ID,
		TaskName:   job.Name,
		Status:     "running",
		TargetType: job.TargetType,
		Targets:    job.Targets,
		StartedAt:  &startedAt,
	}
	if err := db.Create(execution).Error; err != nil {
		return nil, startedAt, fmt.Errorf("创建执行记录失败")
	}
	return execution, startedAt, nil
}

// finishCronExecution 执行定时任务主体并写回执行结果 // Logan.Li
func finishCronExecution(db *gorm.DB, job model.CronJob, executionID uint, startedAt time.Time) {
	content := job.Content
	scriptType := job.Type
	if scriptType == "command" {
		scriptType = "shell"
	}
	if job.Type == "script" && job.ScriptID != nil {
		var script model.Script
		if err := db.First(&script, *job.ScriptID).Error; err == nil {
			content = script.Content
			scriptType = script.Type
			db.Model(&script).UpdateColumn("run_count", script.RunCount+1)
		}
	}

	var output string
	var exitCode int
	var duration int
	status := "success"

	if job.TargetType != "" && job.TargetType != "local" && job.Targets != "" {
		remoteResults, remoteErr := ExecuteCronOnTargets(db, job, scriptType, content, job.Timeout)
		duration = int(time.Since(startedAt).Milliseconds())
		if remoteErr != nil {
			output = fmt.Sprintf("远程执行调度失败: %v", remoteErr)
			exitCode = -1
			status = "failed"
		} else {
			output = remoteexec.FormatExecResults(remoteResults)
			for _, r := range remoteResults {
				if !r.Success {
					status = "failed"
					exitCode = -1
					break
				}
			}
		}
	} else {
		rt := scriptrunner.DetectRuntime()
		if ok, reason := scriptrunner.CanRun(rt, scriptType); !ok {
			output = reason + "\n"
			exitCode = -1
			duration = int(time.Since(startedAt).Milliseconds())
			status = "failed"
		} else {
			output, exitCode, duration = runLocal(scriptType, content, job.Timeout)
		}
		if exitCode != 0 {
			status = "failed"
		}
	}

	finishedAt := time.Now()
	db.Model(&model.TaskExecution{}).Where("id = ?", executionID).Updates(map[string]interface{}{
		"status":      status,
		"output":      output,
		"duration":    duration,
		"finished_at": finishedAt,
	})

	statsUpdates := map[string]interface{}{
		"last_run_at": startedAt,
		"last_status": status,
		"run_count":   job.RunCount + 1,
	}
	if status == "success" {
		statsUpdates["success_count"] = job.SuccessCount + 1
	} else {
		statsUpdates["fail_count"] = job.FailCount + 1
	}
	db.Model(&job).Updates(statsUpdates)
	_ = exitCode
}