package dal

import (
	"context"
	"database/sql"
	_ "embed"
	"encoding/json"
	"fmt"
	"gitea.pena/SQuiz/answerer/dal/sqlcgen"
	"gitea.pena/SQuiz/answerer/model"
	_ "github.com/ClickHouse/clickhouse-go"
	"github.com/google/uuid"
	"github.com/lib/pq"
	_ "github.com/lib/pq"
	"time"
)

type DAL struct {
	pool    *sql.DB
	queries *sqlcgen.Queries
}

func New(ctx context.Context, cred string) (*DAL, error) {
	pool, err := sql.Open("postgres", cred)
	if err != nil {
		return nil, err
	}

	timeoutCtx, cancel := context.WithTimeout(ctx, time.Second)
	defer cancel()

	if err := pool.PingContext(timeoutCtx); err != nil {
		return nil, err
	}

	queries := sqlcgen.New(pool)

	return &DAL{
		pool:    pool,
		queries: queries,
	}, nil
}

func (d *DAL) Close(ctx context.Context) error {
	err := d.pool.Close()
	if err != nil {
		return err
	}
	return nil
}

func (d *DAL) GetQuizByQid(ctx context.Context, qid string) (model.Quiz, error) {
	_, err := uuid.Parse(qid)
	if err != nil {
		return model.Quiz{}, err
	}

	fmt.Println("QUID", `
SELECT * FROM quiz 
WHERE 
	deleted = false AND 
	archived = false AND
  status = 'start' AND
	qid = $1;
`)
	rows, err := d.pool.QueryContext(ctx, `
SELECT * FROM quiz 
WHERE 
	deleted = false AND 
	archived = false AND
  (status = 'start' OR  status = 'ai') AND
	qid = $1;
`, qid)
	if err != nil {
		return model.Quiz{}, err
	}
	defer rows.Close()

	if !rows.Next() {
		return model.Quiz{}, rows.Err()
	}

	var piece model.Quiz
	pIds := pq.Int32Array{}
	if err := rows.Scan(
		&piece.Id,
		&piece.Qid,
		&piece.AccountId,
		&piece.Deleted,
		&piece.Archived,
		&piece.Fingerprinting,
		&piece.Repeatable,
		&piece.NotePrevented,
		&piece.MailNotifications,
		&piece.UniqueAnswers,
		&piece.Super,
		&piece.GroupId,
		&piece.Name,
		&piece.Description,
		&piece.Config,
		&piece.Status,
		&piece.Limit,
		&piece.DueTo,
		&piece.TimeOfPassing,
		&piece.Pausable,
		&piece.Version,
		&piece.VersionComment,
		&pIds,
		&piece.CreatedAt,
		&piece.UpdatedAt,
		&piece.QuestionsCount,
		&piece.PassedCount,
		&piece.AverageTime,
		&piece.SessionCount,
		&piece.GigaChat,
	); err != nil {
		return model.Quiz{}, err
	}

	piece.ParentIds = pIds

	return piece, nil
}

func (d *DAL) GetQuestionListByIDs(ctx context.Context, ids []int32) ([]model.Question, error) {
	rows, err := d.queries.GetQuestionListByIDs(ctx, ids)
	if err != nil {
		return nil, err
	}

	var questions []model.Question
	for _, row := range rows {
		question := model.Question{
			Id:          uint64(row.ID),
			QuizId:      uint64(row.QuizID),
			Title:       row.Title,
			Description: row.Description.String,
			Type:        string(row.Questiontype.([]byte)),
			Required:    row.Required.Bool,
			Deleted:     row.Deleted.Bool,
			Page:        int(row.Page.Int16),
			Content:     row.Content.String,
			Version:     int(row.Version.Int16),
			ParentIds:   row.ParentIds,
			CreatedAt:   row.CreatedAt.Time,
			UpdatedAt:   row.UpdatedAt.Time,
			Auditory:    row.Auditory,
		}

		questions = append(questions, question)
	}

	return questions, nil
}

func (d *DAL) CreateQuestion(ctx context.Context, record *model.Question) (uint64, error) {
	params := sqlcgen.InsertQuestionParams{
		QuizID:       int64(record.QuizId),
		Title:        record.Title,
		Description:  sql.NullString{String: record.Description, Valid: true},
		Questiontype: record.Type,
		Required:     sql.NullBool{Bool: record.Required, Valid: true},
		Page:         sql.NullInt16{Int16: int16(record.Page), Valid: true},
		Content:      sql.NullString{String: record.Content, Valid: true},
		ParentIds:    record.ParentIds,
		UpdatedAt:    sql.NullTime{Time: time.Now(), Valid: true},
		Session:      record.Session,
		Auditory:     record.Auditory,
	}

	data, err := d.queries.InsertQuestion(ctx, params)
	if err != nil {
		return 0, err
	}

	record.Id = uint64(data.ID)
	record.CreatedAt = data.CreatedAt.Time
	record.UpdatedAt = data.UpdatedAt.Time

	return record.Id, nil
}

func (d *DAL) CreateAnswers(ctx context.Context, answers []model.Answer, session, fp string, quizID uint64) ([]model.Answer, []error) {
	var (
		createdAnswers []model.Answer
		errs           []error
	)

	tx, err := d.pool.BeginTx(ctx, nil)
	if err != nil {
		return nil, []error{err}
	}

	for _, ans := range answers {
		if ans.Utm == nil {
			ans.Utm = make(model.UTMSavingMap)
		}
		utmJSON, err := json.Marshal(ans.Utm)
		if err != nil {
			return nil, []error{err}
		}

		params := sqlcgen.InsertAnswersParams{
			Content:     sql.NullString{String: ans.Content, Valid: true},
			QuizID:      int64(quizID),
			QuestionID:  int64(ans.QuestionId),
			Fingerprint: sql.NullString{String: fp, Valid: true},
			Session:     sql.NullString{String: session, Valid: true},
			Result:      sql.NullBool{Bool: ans.Result, Valid: true},
			Email:       ans.Email,
			Device:      ans.Device,
			DeviceType:  ans.DeviceType,
			Ip:          ans.IP,
			Browser:     ans.Browser,
			Os:          ans.OS,
			Start:       ans.Start,
			Utm:         utmJSON,
			Version:     ans.Version,
		}

		row, err := d.queries.InsertAnswers(ctx, params)
		createdAnswer := model.Answer{
			Id:          uint64(row.ID),
			Content:     row.Content.String,
			QuizId:      uint64(row.QuizID),
			QuestionId:  uint64(row.QuestionID),
			Fingerprint: row.Fingerprint.String,
			Session:     row.Session.String,
			Result:      row.Result.Bool,
			New:         row.New.Bool,
			Email:       row.Email,
			DeviceType:  row.DeviceType,
			Device:      row.Device,
			OS:          row.Os,
			Browser:     row.Browser,
			IP:          row.Ip,
			Start:       row.Start,
			Version:     row.Version,
		}

		if err != nil {
			errs = append(errs, err)
		} else {
			createdAnswers = append(createdAnswers, createdAnswer)
		}
	}

	err = tx.Commit()
	if err != nil {
		errs = append(errs, err)
		return nil, errs
	}

	return createdAnswers, errs
}