package gigachatwc

import (
	"context"
	"encoding/json"
	"errors"
	"gitea.pena/SQuiz/common/dal"
	"gitea.pena/SQuiz/common/model"
	"gitea.pena/SQuiz/worker/internal/clients/gigachat"
	"github.com/twmb/franz-go/pkg/kgo"
	"go.uber.org/zap"
	"time"
)

type GigaChatTaskScheduler struct {
	kafkaClient    *kgo.Client
	gigaChatClient *gigachat.GigaChatClient
	logger         *zap.Logger
	dal            *dal.DAL
}

type Deps struct {
	KafkaBrokers   string
	KafkaTopic     string
	KafkaGroup     string
	GigaChatClient *gigachat.GigaChatClient
	Logger         *zap.Logger
	Dal            *dal.DAL
}

func NewGigaChatTaskScheduler(deps Deps) (*GigaChatTaskScheduler, error) {
	client, err := kgo.NewClient(
		kgo.SeedBrokers(deps.KafkaBrokers),
		kgo.ConsumerGroup(deps.KafkaGroup),
		kgo.ConsumeTopics(deps.KafkaTopic),
		kgo.ConsumeResetOffset(kgo.NewOffset().AfterMilli(time.Now().UnixMilli())),
	)
	if err != nil {
		return nil, err
	}

	return &GigaChatTaskScheduler{
		kafkaClient:    client,
		gigaChatClient: deps.GigaChatClient,
		logger:         deps.Logger,
		dal:            deps.Dal,
	}, nil
}

type MessageGigaChat struct {
	ID     int64  `json:"id"`
	QuizID int64  `json:"quiz_id"`
	Sex    bool   `json:"sex"`
	Age    string `json:"age"`
}

type UpdJsonQuestionData struct {
	Title       string `json:"title"`
	Description string `json:"description"`
}

func (r *GigaChatTaskScheduler) Start(ctx context.Context) {
	ticker := time.NewTicker(3 * time.Minute)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			r.fetchMessages(ctx)
		case <-ctx.Done():
			return
		}
	}
}

func (r *GigaChatTaskScheduler) fetchMessages(ctx context.Context) {
	fetches := r.kafkaClient.PollFetches(ctx)
	iter := fetches.RecordIter()

	for !iter.Done() {
		record := iter.Next()

		var msg MessageGigaChat
		if err := json.Unmarshal(record.Value, &msg); err != nil {
			r.logger.Error("failed to unmarshal kafka message", zap.ByteString("value", record.Value), zap.Error(err))
			continue
		}

		r.handleMessage(ctx, msg)
	}
}

func (r *GigaChatTaskScheduler) handleMessage(ctx context.Context, msg MessageGigaChat) {
	listQuestions, _, err := r.dal.QuestionRepo.GetQuestionList(ctx, 100_000, 0, 0, 0, uint64(msg.QuizID), false, false, "", "", 0)
	if err != nil {
		r.logger.Error("failed to get question list", zap.Error(err))
		return
	}

	audience := model.GigaChatAudience{
		ID:     msg.ID,
		QuizID: msg.QuizID,
		Sex:    msg.Sex,
		Age:    msg.Age,
	}

	for _, question := range listQuestions {
		var (
			updJson string
			resp    UpdJsonQuestionData
		)
		// вот дилемма сколько попыток нам нужно? может ли гигачат отлючить нам некоторые ограничения
		// можем ли мы скипать вопросы с которыми у нас произошла ошибка
		for i := 0; i < 10; i++ {
			updJson, err = r.gigaChatClient.SendMsg(ctx, audience, question)
			if err == nil {
				if err = json.Unmarshal([]byte(updJson), &resp); err == nil {
					question.Title = resp.Title
					question.Description = resp.Description
					break
				}
			}

			if errors.Is(err, model.EmptyResponseErrorGigaChat) {
				r.logger.Warn("empty response from GigaChat, retrying...", zap.Int("attempt", i+1), zap.Uint64("question_id", question.Id))
				continue
			}

			r.logger.Error("failed to send message to GigaChat", zap.Error(err))
			break
		}

		question.Auditory = msg.ID

		_, err = r.dal.QuestionRepo.CreateQuestion(ctx, &question)
		if err != nil {
			r.logger.Error("failed to create updated question", zap.Error(err))
			continue
		}
	}
}