// services/processor.go
package services

import (
	"context"
	"go-policy-service/models"
	"go-policy-service/utils"
	"sync"
)

type TaskProcessor struct {
	httpClient  utils.HTTPClient
	concurrency int
}

func NewTaskProcessor(httpClient utils.HTTPClient, concurrency int) *TaskProcessor {
	return &TaskProcessor{
		httpClient:  httpClient,
		concurrency: concurrency,
	}
}

func (p *TaskProcessor) ProcessTasks(ctx context.Context) error {
	// 获取待处理任务
	tasks, err := models.GetPendingTasks(ctx, 1000) // 每次最多处理1000个任务
	if err != nil {
		return err
	}

	// 创建任务通道
	taskChan := make(chan models.Task)
	var wg sync.WaitGroup

	// 启动worker
	for i := 0; i < p.concurrency; i++ {
		wg.Add(1)
		go p.worker(ctx, &wg, taskChan)
	}

	// 分发任务
	for _, task := range tasks {
		select {
		case taskChan <- task:
		case <-ctx.Done():
			close(taskChan)
			wg.Wait()
			return ctx.Err()
		}
	}

	close(taskChan)
	wg.Wait()
	return nil
}

func (p *TaskProcessor) worker(ctx context.Context, wg *sync.WaitGroup, tasks <-chan models.Task) {
	defer wg.Done()

	for task := range tasks {
		select {
		case <-ctx.Done():
			return
		default:
			p.processTask(ctx, task)
		}
	}
}

func (p *TaskProcessor) processTask(ctx context.Context, task models.Task) {
	// 调用第三方接口
	resp, err := p.httpClient.PostJSON(ctx, "https://partner.huoli.com/distribution/api/shopping/flight/list?token=", task.Params)
	if err != nil {
		utils.Logger.WithField("task_id", task.ID).Error("API request failed: ", err)
		//models.UpdateTaskStatus(ctx, task.ID, "failed", task.Attempts+1)
		return
	}

	// 处理响应数据
	processedData, err := processResponse(resp)
	if err != nil {
		utils.Logger.WithField("task_id", task.ID).Error("Response processing failed: ", err)
		//models.UpdateTaskStatus(ctx, task.ID, "failed", task.Attempts+1)
		return
	}

	// 保存处理后的数据
	if err := models.SaveProcessedData(ctx, &models.ProcessedData{
		TaskID: task.ID,
		Data:   processedData,
	}); err != nil {
		utils.Logger.WithField("task_id", task.ID).Error("Failed to save processed data: ", err)
		return
	}

	// 更新任务状态
	// if err := models.UpdateTaskStatus(ctx, task.ID, "completed", task.Attempts+1); err != nil {
	// 	utils.Logger.WithField("task_id", task.ID).Error("Failed to update task status: ", err)
	// }
}

func processResponse(response []byte) (string, error) {
	// 实现具体的响应处理逻辑
	
	// 示例：直接返回原始响应
	return string(response), nil
}