package do

import (
	"ai_scheduler/internal/config"
	errors "ai_scheduler/internal/data/error"
	"ai_scheduler/internal/data/impl"
	"ai_scheduler/internal/data/model"
	"ai_scheduler/internal/entitys"
	"ai_scheduler/internal/pkg"
	"ai_scheduler/tmpl/dataTemp"
	"context"
	"fmt"
	"strconv"
	"strings"
	"time"

	"gitea.cdlsxd.cn/self-tools/l_request"
	"github.com/gofiber/fiber/v2/log"
	"github.com/gofiber/websocket/v2"

	"xorm.io/builder"
)

type Do struct {
	Ctx         *entitys.RequireData
	sessionImpl *impl.SessionImpl
	sysImpl     *impl.SysImpl
	taskImpl    *impl.TaskImpl
	hisImpl     *impl.ChatImpl
	conf        *config.Config
}

func NewDo(
	sysImpl *impl.SysImpl,
	taskImpl *impl.TaskImpl,
	hisImpl *impl.ChatImpl,
	conf *config.Config,
) *Do {
	return &Do{
		conf:     conf,
		sysImpl:  sysImpl,
		hisImpl:  hisImpl,
		taskImpl: taskImpl,
	}
}

func (d *Do) InitCtx(req *entitys.ChatSockRequest) *Do {
	d.Ctx = &entitys.RequireData{
		Req: req,
	}
	return d
}

func (d *Do) DataAuth(c *websocket.Conn) (err error) {
	d.Ctx.Session = c.Query("x-session", "")
	if len(d.Ctx.Session) == 0 {
		err = errors.SessionNotFound
		return
	}
	d.Ctx.Auth = c.Query("x-authorization", "")
	if len(d.Ctx.Auth) == 0 {
		err = errors.AuthNotFound
		return
	}
	d.Ctx.Key = c.Query("x-app-key", "")
	if len(d.Ctx.Key) == 0 {
		err = errors.KeyNotFound
		return
	}

	d.Ctx.Sys, err = d.getSysInfo()
	if err != nil {
		err = errors.SysErr("获取系统信息失败：%v", err.Error())
		return
	}
	d.Ctx.Histories, err = d.getSessionChatHis()
	if err != nil {
		err = errors.SysErr("获取历史记录失败：%v", err.Error())
		return
	}

	d.Ctx.Tasks, err = d.getTasks(d.Ctx.Sys.SysID)
	if err != nil {
		err = errors.SysErr("获取任务列表失败：%v", err.Error())
		return
	}
	if err = d.getImgData(); err != nil {
		return
	}

	return
}

func (d *Do) MakeCh(c *websocket.Conn) (ctx context.Context, deferFunc func()) {
	d.Ctx.Ch = make(chan entitys.Response)
	ctx, cancel := context.WithCancel(context.Background())
	done := d.startMessageHandler(ctx, c, d.hisImpl)
	return ctx, func() {
		close(d.Ctx.Ch) //关闭主通道
		<-done          // 等待消息处理完成
		cancel()
	}
}

func (d *Do) getImgData() (err error) {
	if len(d.Ctx.Req.Img) == 0 {
		return
	}
	imgs := strings.Split(d.Ctx.Req.Img, ",")
	if len(imgs) == 0 {
		return
	}

	for k, img := range imgs {
		baseErr := "获取第" + strconv.Itoa(k+1) + "张图片失败："
		entitys.ResLog(d.Ctx.Ch, "img_get_start", "正在获取第"+strconv.Itoa(k+1)+"张图片")
		if err = pkg.ValidateImageURL(img); err != nil {
			entitys.ResLog(d.Ctx.Ch, "", baseErr+"：expected image content")
			continue
		}
		req := l_request.Request{
			Method: "GET",
			Url:    img,
			Headers: map[string]string{
				"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
				"Accept":     "image/webp,image/apng,image/*,*/*;q=0.8",
			},
		}
		res, _err := req.Send()
		if _err != nil {
			entitys.ResLog(d.Ctx.Ch, "", baseErr+_err.Error())
			continue
		}
		if _, ex := res.Headers["Content-Type"]; !ex {
			entitys.ResLog(d.Ctx.Ch, "", baseErr+"：Content-Type不存在")
			continue
		}
		if !strings.HasPrefix(res.Headers["Content-Type"], "image/") {
			entitys.ResLog(d.Ctx.Ch, "", baseErr+"：expected image content")
			continue
		}
		d.Ctx.ImgByte = append(d.Ctx.ImgByte, res.Content)
		d.Ctx.ImgUrls = append(d.Ctx.ImgUrls, img)
		entitys.ResLog(d.Ctx.Ch, "img_get_end", "第"+strconv.Itoa(k+1)+"张图片获取成功")
	}

	return
}

func (d *Do) getRequireData() (err error) {

	return
}

func (d *Do) getSysInfo() (sysInfo model.AiSy, err error) {
	cond := builder.NewCond()
	cond = cond.And(builder.Eq{"app_key": d.Ctx.Key})
	cond = cond.And(builder.IsNull{"delete_at"})
	cond = cond.And(builder.Eq{"status": 1})
	err = d.sysImpl.GetOneBySearchToStrut(&cond, &sysInfo)
	return
}

func (d *Do) getSessionChatHis() (his []model.AiChatHi, err error) {

	cond := builder.NewCond()
	cond = cond.And(builder.Eq{"session_id": d.Ctx.Session})

	_, err = d.hisImpl.GetListToStruct(&cond, &dataTemp.ReqPageBo{Limit: d.conf.Sys.SessionLen}, &his, "his_id desc")

	return
}

func (d *Do) getTasks(sysId int32) (tasks []model.AiTask, err error) {

	cond := builder.NewCond()
	cond = cond.And(builder.Eq{"sys_id": sysId})
	cond = cond.And(builder.IsNull{"delete_at"})
	cond = cond.And(builder.Eq{"status": 1})
	_, err = d.taskImpl.GetListToStruct(&cond, nil, &tasks, "")

	return
}

// startMessageHandler 启动独立的消息处理协程
func (d *Do) startMessageHandler(
	ctx context.Context,
	c *websocket.Conn,
	hisImpl *impl.ChatImpl,
) <-chan struct{} {
	done := make(chan struct{})
	var chat []string

	go func() {
		defer func() {
			close(done)
			// 保存历史记录
			var his = []*model.AiChatHi{
				{
					SessionID: d.Ctx.Session,
					Role:      "user",
					Content:   d.Ctx.Req.Text, // 用户输入在外部处理
				},
			}
			if len(chat) > 0 {
				his = append(his, &model.AiChatHi{
					SessionID: d.Ctx.Session,
					Role:      "assistant",
					Content:   strings.Join(chat, ""),
				})
			}
			for _, hi := range his {
				hisImpl.Add(hi)
			}
		}()

		for v := range d.Ctx.Ch { // 自动检测通道关闭
			if err := sendWithTimeout(c, v, 2*time.Second); err != nil {
				log.Errorf("Send error: %v", err)
				return
			}
			if v.Type == entitys.ResponseText || v.Type == entitys.ResponseStream || v.Type == entitys.ResponseJson {
				chat = append(chat, v.Content)
			}
		}
	}()

	return done
}

// 辅助函数：带超时的 WebSocket 发送
func sendWithTimeout(c *websocket.Conn, data entitys.Response, timeout time.Duration) error {
	sendCtx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	done := make(chan error, 1)
	go func() {
		defer func() {
			if r := recover(); r != nil {
				done <- fmt.Errorf("panic in MsgSend: %v", r)
			}
			close(done)
		}()
		// 如果 MsgSend 阻塞，这里会卡住
		err := entitys.MsgSend(c, data)
		done <- err
	}()

	select {
	case err := <-done:
		return err
	case <-sendCtx.Done():
		return sendCtx.Err()
	}
}