package task

import (
	"context"
	"fmt"

	"git.huangwc.com/pig/pig-farm-controller/internal/domain/device"
	"git.huangwc.com/pig/pig-farm-controller/internal/domain/plan"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/logs"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/repository"
)

// FullCollectionTask 实现了 plan.Task 接口，用于执行一次全量的设备数据采集
type FullCollectionTask struct {
	ctx           context.Context
	log           *models.TaskExecutionLog
	deviceRepo    repository.DeviceRepository
	deviceService device.Service
}

// NewFullCollectionTask 创建一个全量采集任务实例
func NewFullCollectionTask(
	ctx context.Context,
	log *models.TaskExecutionLog,
	deviceRepo repository.DeviceRepository,
	deviceService device.Service,
) plan.Task {
	return &FullCollectionTask{
		ctx:           ctx,
		log:           log,
		deviceRepo:    deviceRepo,
		deviceService: deviceService,
	}
}

// Execute 是任务的核心执行逻辑
func (t *FullCollectionTask) Execute(ctx context.Context) error {
	taskCtx, logger := logs.Trace(ctx, t.ctx, "Execute")
	logger.Infow("开始执行全量采集任务", "task_id", t.log.TaskID, "task_type", t.log.Task.Type, "log_id", t.log.ID)

	sensors, err := t.deviceRepo.ListAllSensors(taskCtx)
	if err != nil {
		return fmt.Errorf("全量采集任务: 从数据库获取所有传感器失败: %w", err)
	}

	if len(sensors) == 0 {
		logger.Infow("全量采集任务: 未发现任何传感器设备，跳过本次采集", "task_id", t.log.TaskID, "task_type", t.log.Task.Type, "log_id", t.log.ID)
		return nil
	}

	sensorsByController := make(map[uint][]*models.Device)
	for _, sensor := range sensors {
		sensorsByController[sensor.AreaControllerID] = append(sensorsByController[sensor.AreaControllerID], sensor)
	}

	var firstError error
	for controllerID, controllerSensors := range sensorsByController {
		logger.Infow("全量采集任务: 准备为区域主控下的传感器下发采集指令",
			"task_id", t.log.TaskID,
			"task_type", t.log.Task.Type,
			"log_id", t.log.ID,
			"controller_id", controllerID,
			"sensor_count", len(controllerSensors),
		)
		if err := t.deviceService.Collect(taskCtx, controllerID, controllerSensors); err != nil {
			logger.Errorw("全量采集任务: 为区域主控下发采集指令失败",
				"task_id", t.log.TaskID,
				"task_type", t.log.Task.Type,
				"log_id", t.log.ID,
				"controller_id", controllerID,
				"error", err,
			)
			if firstError == nil {
				firstError = err // 保存第一个错误
			}
		}
	}

	if firstError != nil {
		return fmt.Errorf("全量采集任务执行期间发生错误: %w", firstError)
	}

	logger.Infow("全量采集任务执行完成", "task_id", t.log.TaskID, "task_type", t.log.Task.Type, "log_id", t.log.ID)
	return nil
}

// OnFailure 定义了当 Execute 方法返回错误时，需要执行的回滚或清理逻辑
func (t *FullCollectionTask) OnFailure(ctx context.Context, executeErr error) {
	logger := logs.TraceLogger(ctx, t.ctx, "OnFailure")
	logger.Errorw("全量采集任务执行失败",
		"task_id", t.log.TaskID,
		"task_type", t.log.Task.Type,
		"log_id", t.log.ID,
		"error", executeErr,
	)
}

// ResolveDeviceIDs 获取当前任务需要使用的设备ID列表
func (t *FullCollectionTask) ResolveDeviceIDs(ctx context.Context) ([]uint, error) {
	// 全量采集任务不和任何设备绑定, 每轮采集都会重新获取全量传感器
	return []uint{}, nil
}