package service

import (
	"encoding/json"
	"errors"

	"gorm.io/gorm"

	"laic-backend/common"
	"laic-backend/logger"
	"laic-backend/model"
	"laic-backend/vo"
)

type ExecutionService struct{}

var DefaultExecutionService = &ExecutionService{}

// GetPage 执行记录分页列表（按所属机巢过滤）
func (s *ExecutionService) GetPage(userID int64, isAdmin bool, req *vo.ExecutionPageReq) (*common.PageResponse[model.TaskExecution], *common.BusiError) {
	db := common.DB.Model(&model.TaskExecution{}).Scopes(withDockFilter(userID, isAdmin))
	if req.Status != "" {
		db = db.Where("status = ?", req.Status)
	}
	if req.TaskID != "" {
		db = db.Where("task_id = ?", req.TaskID)
	}
	if req.DockID != "" {
		db = db.Where("dock_id = ?", req.DockID)
	}

	var total int64
	if err := db.Count(&total).Error; err != nil {
		logger.ERROR("统计执行记录失败", err)
		return nil, common.ErrInternal
	}
	var list []model.TaskExecution
	if err := db.Scopes(req.Paginate).Order("id DESC").Find(&list).Error; err != nil {
		logger.ERROR("查询执行记录失败", err)
		return nil, common.ErrInternal
	}
	return common.Page(req.Pagination, total, list), nil
}

// GetDetail 执行记录详情
func (s *ExecutionService) GetDetail(userID int64, isAdmin bool, id int64) (*model.TaskExecution, *common.BusiError) {
	var exec model.TaskExecution
	if err := common.DB.Scopes(withDockFilter(userID, isAdmin)).First(&exec, id).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, common.ErrExecutionNotFound
		}
		return nil, common.ErrInternal
	}
	return &exec, nil
}

// GetTrajectory 执行轨迹（解析 trajectory_json）
func (s *ExecutionService) GetTrajectory(userID int64, isAdmin bool, id int64) (*vo.TrajectoryVO, *common.BusiError) {
	var exec model.TaskExecution
	if err := common.DB.Scopes(withDockFilter(userID, isAdmin)).First(&exec, id).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, common.ErrExecutionNotFound
		}
		return nil, common.ErrInternal
	}

	points := []vo.TrajectoryPoint{}
	if len(exec.TrajectoryJSON) > 0 {
		if err := json.Unmarshal([]byte(exec.TrajectoryJSON), &points); err != nil {
			logger.ERROR("解析轨迹失败", err)
			return nil, common.ErrInternal
		}
	}
	return &vo.TrajectoryVO{ExecutionID: exec.ID, DockID: exec.DockID, Points: points}, nil
}