package dto

import (
	"encoding/json"
	"errors"
	"fmt"

	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
)

// NewPlanFromCreateRequest 将 CreatePlanRequest 转换为 models.Plan
func NewPlanFromCreateRequest(req *CreatePlanRequest) (*models.Plan, error) {
	plan := &models.Plan{
		Name:           req.Name,
		Description:    req.Description,
		ExecutionType:  req.ExecutionType,
		ExecuteNum:     req.ExecuteNum,
		CronExpression: req.CronExpression,
		Status:         models.PlanStatusDisabled, // 默认创建时为禁用状态
	}

	if len(req.SubPlanIDs) > 0 {
		plan.ContentType = models.PlanContentTypeSubPlans
		for _, subPlanID := range req.SubPlanIDs {
			plan.SubPlans = append(plan.SubPlans, models.SubPlan{
				ChildPlanID: subPlanID,
			})
		}
	} else if len(req.Tasks) > 0 {
		plan.ContentType = models.PlanContentTypeTasks
		for _, taskReq := range req.Tasks {
			parametersJSON, err := json.Marshal(taskReq.Parameters)
			if err != nil {
				return nil, fmt.Errorf("序列化任务参数失败: %w", err)
			}
			plan.Tasks = append(plan.Tasks, models.Task{
				Name:           taskReq.Name,
				Description:    taskReq.Description,
				ExecutionOrder: taskReq.ExecutionOrder,
				Type:           taskReq.Type,
				Parameters:     parametersJSON,
			})
		}
	} else {
		return nil, errors.New("计划必须包含子计划或任务")
	}

	return plan, nil
}

// NewPlanFromUpdateRequest 将 UpdatePlanRequest 转换为 models.Plan
func NewPlanFromUpdateRequest(req *UpdatePlanRequest) (*models.Plan, error) {
	plan := &models.Plan{
		Name:           req.Name,
		Description:    req.Description,
		ExecutionType:  req.ExecutionType,
		ExecuteNum:     req.ExecuteNum,
		CronExpression: req.CronExpression,
	}

	if len(req.SubPlanIDs) > 0 {
		plan.ContentType = models.PlanContentTypeSubPlans
		for _, subPlanID := range req.SubPlanIDs {
			plan.SubPlans = append(plan.SubPlans, models.SubPlan{
				ChildPlanID: subPlanID,
			})
		}
	} else if len(req.Tasks) > 0 {
		plan.ContentType = models.PlanContentTypeTasks
		for _, taskReq := range req.Tasks {
			parametersJSON, err := json.Marshal(taskReq.Parameters)
			if err != nil {
				return nil, fmt.Errorf("序列化任务参数失败: %w", err)
			}
			plan.Tasks = append(plan.Tasks, models.Task{
				Name:           taskReq.Name,
				Description:    taskReq.Description,
				ExecutionOrder: taskReq.ExecutionOrder,
				Type:           taskReq.Type,
				Parameters:     parametersJSON,
			})
		}
	} else {
		return nil, errors.New("计划必须包含子计划或任务")
	}

	return plan, nil
}

// NewPlanToResponse 将 models.Plan 转换为 PlanResponse
func NewPlanToResponse(plan *models.Plan) (*PlanResponse, error) {
	if plan == nil {
		return nil, nil
	}

	resp := &PlanResponse{
		ID:             plan.ID,
		Name:           plan.Name,
		Description:    plan.Description,
		ExecutionType:  plan.ExecutionType,
		Status:         plan.Status,
		ExecuteNum:     plan.ExecuteNum,
		ExecuteCount:   plan.ExecuteCount,
		CronExpression: plan.CronExpression,
		ContentType:    plan.ContentType,
	}

	if plan.ContentType == models.PlanContentTypeSubPlans && len(plan.SubPlans) > 0 {
		resp.SubPlans = make([]SubPlanResponse, 0, len(plan.SubPlans))
		for _, sp := range plan.SubPlans {
			childPlanResp, err := NewPlanToResponse(sp.ChildPlan) // 递归调用
			if err != nil {
				return nil, err
			}
			resp.SubPlans = append(resp.SubPlans, SubPlanResponse{
				ID:             sp.ID,
				ParentPlanID:   sp.ParentPlanID,
				ChildPlanID:    sp.ChildPlanID,
				ExecutionOrder: sp.ExecutionOrder,
				ChildPlan:      childPlanResp,
			})
		}
	} else if plan.ContentType == models.PlanContentTypeTasks && len(plan.Tasks) > 0 {
		resp.Tasks = make([]TaskResponse, 0, len(plan.Tasks))
		for _, task := range plan.Tasks {
			var parameters map[string]interface{}
			if len(task.Parameters) > 0 && string(task.Parameters) != "null" {
				if err := json.Unmarshal(task.Parameters, &parameters); err != nil {
					return nil, fmt.Errorf("解析任务参数失败 (ID: %d): %w", task.ID, err)
				}
			}
			resp.Tasks = append(resp.Tasks, TaskResponse{
				ID:             task.ID,
				PlanID:         task.PlanID,
				Name:           task.Name,
				Description:    task.Description,
				ExecutionOrder: task.ExecutionOrder,
				Type:           task.Type,
				Parameters:     parameters,
			})
		}
	}

	return resp, nil
}