package plan

import (
	"encoding/json"
	"fmt"

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

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

	response := &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,
	}

	// 转换子计划
	if plan.ContentType == models.PlanContentTypeSubPlans {
		response.SubPlans = make([]SubPlanResponse, len(plan.SubPlans))
		for i, subPlan := range plan.SubPlans {
			subPlanResp, err := SubPlanToResponse(&subPlan)
			if err != nil {
				return nil, err
			}
			response.SubPlans[i] = subPlanResp
		}
	}

	// 转换任务
	if plan.ContentType == models.PlanContentTypeTasks {
		response.Tasks = make([]TaskResponse, len(plan.Tasks))
		for i, task := range plan.Tasks {
			taskResp, err := TaskToResponse(&task)
			if err != nil {
				return nil, err
			}
			response.Tasks[i] = taskResp
		}
	}

	return response, nil
}

// PlanFromCreateRequest 将CreatePlanRequest转换为Plan模型，并进行业务规则验证
func PlanFromCreateRequest(req *CreatePlanRequest) (*models.Plan, error) {
	if req == nil {
		return nil, nil
	}

	plan := &models.Plan{
		Name:           req.Name,
		Description:    req.Description,
		ExecutionType:  req.ExecutionType,
		ExecuteNum:     req.ExecuteNum,
		CronExpression: req.CronExpression,
		// ContentType 在控制器中设置，此处不再处理
	}

	// 处理子计划 (通过ID引用)
	if req.SubPlanIDs != nil {
		subPlanSlice := req.SubPlanIDs
		plan.SubPlans = make([]models.SubPlan, len(subPlanSlice))
		for i, childPlanID := range subPlanSlice {
			plan.SubPlans[i] = models.SubPlan{
				ChildPlanID:    childPlanID,
				ExecutionOrder: i, // 默认执行顺序, ReorderSteps会再次确认
			}
		}
	}

	// 处理任务
	if req.Tasks != nil {
		taskSlice := req.Tasks
		plan.Tasks = make([]models.Task, len(taskSlice))
		for i, taskReq := range taskSlice {
			task, err := TaskFromRequest(&taskReq)
			if err != nil {
				return nil, err
			}
			plan.Tasks[i] = task
		}
	}

	// 1. 首先，执行重复性验证
	if err := plan.ValidateExecutionOrder(); err != nil {
		// 如果检测到重复，立即返回错误
		return nil, err
	}

	// 2. 然后，调用方法来修复顺序断层
	plan.ReorderSteps()

	return plan, nil
}

// PlanFromUpdateRequest 将UpdatePlanRequest转换为Plan模型，并进行业务规则验证
func PlanFromUpdateRequest(req *UpdatePlanRequest) (*models.Plan, error) {
	if req == nil {
		return nil, nil
	}

	plan := &models.Plan{
		Name:           req.Name,
		Description:    req.Description,
		ExecutionType:  req.ExecutionType,
		ExecuteNum:     req.ExecuteNum,
		CronExpression: req.CronExpression,
		// ContentType 在控制器中设置，此处不再处理
	}

	// 处理子计划 (通过ID引用)
	if req.SubPlanIDs != nil {
		subPlanSlice := req.SubPlanIDs
		plan.SubPlans = make([]models.SubPlan, len(subPlanSlice))
		for i, childPlanID := range subPlanSlice {
			plan.SubPlans[i] = models.SubPlan{
				ChildPlanID:    childPlanID,
				ExecutionOrder: i, // 默认执行顺序, ReorderSteps会再次确认
			}
		}
	}

	// 处理任务
	if req.Tasks != nil {
		taskSlice := req.Tasks
		plan.Tasks = make([]models.Task, len(taskSlice))
		for i, taskReq := range taskSlice {
			task, err := TaskFromRequest(&taskReq)
			if err != nil {
				return nil, err
			}
			plan.Tasks[i] = task
		}
	}

	// 1. 首先，执行重复性验证
	if err := plan.ValidateExecutionOrder(); err != nil {
		// 如果检测到重复，立即返回错误
		return nil, err
	}

	// 2. 然后，调用方法来修复顺序断层
	plan.ReorderSteps()

	return plan, nil
}

// SubPlanToResponse 将SubPlan模型转换为SubPlanResponse
func SubPlanToResponse(subPlan *models.SubPlan) (SubPlanResponse, error) {
	if subPlan == nil {
		return SubPlanResponse{}, nil
	}

	response := SubPlanResponse{
		ID:             subPlan.ID,
		ParentPlanID:   subPlan.ParentPlanID,
		ChildPlanID:    subPlan.ChildPlanID,
		ExecutionOrder: subPlan.ExecutionOrder,
	}

	// 如果有完整的子计划数据，也进行转换
	if subPlan.ChildPlan != nil {
		childPlanResp, err := PlanToResponse(subPlan.ChildPlan)
		if err != nil {
			return SubPlanResponse{}, err
		}
		response.ChildPlan = childPlanResp
	}

	return response, nil
}

// TaskToResponse 将Task模型转换为TaskResponse
func TaskToResponse(task *models.Task) (TaskResponse, error) {
	if task == nil {
		return TaskResponse{}, nil
	}

	var params map[string]interface{}
	if len(task.Parameters) > 0 && string(task.Parameters) != "null" {
		if err := json.Unmarshal(task.Parameters, &params); err != nil {
			return TaskResponse{}, fmt.Errorf("parsing task parameters failed (ID: %d): %w", task.ID, err)
		}
	}

	return TaskResponse{
		ID:             task.ID,
		PlanID:         task.PlanID,
		Name:           task.Name,
		Description:    task.Description,
		ExecutionOrder: task.ExecutionOrder,
		Type:           task.Type,
		Parameters:     params,
	}, nil
}

// TaskFromRequest 将TaskRequest转换为Task模型
func TaskFromRequest(req *TaskRequest) (models.Task, error) {
	if req == nil {
		return models.Task{}, nil
	}

	paramsJSON, err := json.Marshal(req.Parameters)
	if err != nil {
		return models.Task{}, fmt.Errorf("serializing task parameters failed: %w", err)
	}

	return models.Task{
		Name:           req.Name,
		Description:    req.Description,
		ExecutionOrder: req.ExecutionOrder,
		Type:           req.Type,
		Parameters:     paramsJSON,
	}, nil
}