package doris

import (
	"encoding/json"
	"fmt"
	"sync"
	"time"

	"git.x2erp.com/qdy/go-base/config"
	"git.x2erp.com/qdy/go-db/factory/http"
	"github.com/go-resty/resty/v2"
)

// DorisFactory Doris HTTP客户端工厂
type DorisFactory struct {
	client   *resty.Client // 线程安全
	FEHost   string        // 只读
	FEPort   int           // 只读
	Username string        // 只读
	Password string        // 只读
	Timeout  time.Duration // 只读

	isClosed bool         // 需要原子操作或锁保护
	closedMu sync.RWMutex // 只保护 isClosed 字段
}

var (
	instance     *DorisFactory
	instanceOnce sync.Once
)

// GetDorisFactory 获取Doris工厂单例
func GetDorisFactory(httpFactory *http.HTTPFactory) (*DorisFactory, error) {
	var initErr error
	instanceOnce.Do(func() {
		cfg, err := config.GetConfig()

		if err != nil {
			initErr = fmt.Errorf("failed to load config: %v", err)
			return
		}

		if !cfg.IsDorisConfigured() {
			initErr = fmt.Errorf("doris configuration is incomplete")
			return
		}

		dorisConfig := cfg.GetDorisConfig()
		instance = &DorisFactory{
			client:   httpFactory.GetUnderlyingClient(),
			FEHost:   dorisConfig.FEHost,
			FEPort:   dorisConfig.FEPort,
			Username: dorisConfig.FEUsername,
			Password: dorisConfig.FEPassword,
			Timeout:  time.Duration(dorisConfig.StreamLoadTimeout) * time.Second,
			isClosed: false,
		}
	})

	if initErr != nil {
		return nil, initErr
	}

	return instance, nil
}

// InsertCSV 插入CSV数据到Doris
func (f *DorisFactory) InsertCSV(database, table, csvData string, skipHeader bool) error {
	// 检查关闭状态
	if f.IsClosed() {
		return fmt.Errorf("doris client is closed")
	}

	url := fmt.Sprintf("http://%s:%d/api/%s/%s/_stream_load", f.FEHost, f.FEPort, database, table)

	fmt.Print(url)

	// 使用 resty 的 API
	resp, err := f.client.R().
		SetBasicAuth(f.Username, f.Password).
		SetHeader("column_separator", ","). // 必需
		SetHeader("enclose", "\"").
		SetHeader("Expect", "100-continue").
		SetBody(csvData).
		Put(url)

	if skipHeader {
		resp.Request.SetHeader("skip_header", "1")
	}

	if err != nil {
		return fmt.Errorf("请求失败: %v", err)
	}

	if resp.StatusCode() != 200 {
		return fmt.Errorf("插入失败: %s", string(resp.Body()))
	}

	// 解析Stream Load响应
	var result struct {
		Status  string `json:"Status"`
		Message string `json:"Message"`
	}
	if err := json.Unmarshal(resp.Body(), &result); err != nil {
		return fmt.Errorf("解析响应失败: %v", err)
	}

	if result.Status != "Success" {
		return fmt.Errorf("插入失败: %s", result.Message)
	}

	return nil
}

// Close 关闭Doris客户端
func (f *DorisFactory) Close() error {
	f.closedMu.Lock()
	defer f.closedMu.Unlock()

	if f.isClosed {
		return nil
	}

	f.isClosed = true
	return nil
}

// IsClosed 检查客户端是否已关闭
func (f *DorisFactory) IsClosed() bool {
	f.closedMu.RLock()
	defer f.closedMu.RUnlock()
	return f.isClosed
}