package handlers

import (
	"context"
	"encoding/json"
	"fmt"
	oapi "nyanimedb/api"
	sqlc "nyanimedb/sql"
	"strconv"

	"github.com/jackc/pgx/v5"
	log "github.com/sirupsen/logrus"
)

func Word2Sqlc(s *string) *string {
	if s == nil || *s == "" {
		return nil
	}

	return s
}

type SqlcStatus struct {
	ongoing  string
	finished string
	planned  string
}

func TitleStatus2Sqlc(s *[]oapi.TitleStatus) (*SqlcStatus, error) {
	var sqlc_status SqlcStatus
	if s == nil {
		return &sqlc_status, nil
	}
	for _, t := range *s {
		switch t {
		case oapi.TitleStatusFinished:
			sqlc_status.finished = "finished"
		case oapi.TitleStatusOngoing:
			sqlc_status.ongoing = "ongoing"
		case oapi.TitleStatusPlanned:
			sqlc_status.planned = "planned"
		default:
			return nil, fmt.Errorf("unexpected tittle status: %s", t)
		}
	}
	return &sqlc_status, nil
}

func TitleStatus2oapi(s *sqlc.TitleStatusT) (*oapi.TitleStatus, error) {
	if s == nil {
		return nil, nil
	}
	var t oapi.TitleStatus
	switch *s {
	case sqlc.TitleStatusTFinished:
		t = oapi.TitleStatusFinished
	case sqlc.TitleStatusTOngoing:
		t = oapi.TitleStatusOngoing
	case sqlc.TitleStatusTPlanned:
		t = oapi.TitleStatusPlanned
	default:
		return nil, fmt.Errorf("unexpected tittle status: %s", *s)
	}
	return &t, nil
}

func ReleaseSeason2sqlc(s *oapi.ReleaseSeason) (*sqlc.ReleaseSeasonT, error) {
	if s == nil {
		return nil, nil
	}
	var t sqlc.ReleaseSeasonT
	switch *s {
	case oapi.Winter:
		t = sqlc.ReleaseSeasonTWinter
	case oapi.Spring:
		t = sqlc.ReleaseSeasonTSpring
	case oapi.Summer:
		t = sqlc.ReleaseSeasonTSummer
	case oapi.Fall:
		t = sqlc.ReleaseSeasonTFall
	default:
		return nil, fmt.Errorf("unexpected release season: %s", *s)
	}
	return &t, nil
}

func (s Server) GetTagsByTitleId(ctx context.Context, id int64) (oapi.Tags, error) {

	sqlc_title_tags, err := s.db.GetTitleTags(ctx, id)
	if err != nil {
		if err == pgx.ErrNoRows {
			return nil, nil
		}
		return nil, fmt.Errorf("query GetTitleTags: %v", err)
	}

	oapi_tag_names := make(oapi.Tags, 1)
	for _, title_tag := range sqlc_title_tags {
		oapi_tag_name := make(map[string]string, 1)
		err = json.Unmarshal(title_tag, &oapi_tag_name)
		if err != nil {
			return nil, fmt.Errorf("unmarshalling title_tag: %v", err)
		}
		oapi_tag_names = append(oapi_tag_names, oapi_tag_name)
	}

	return oapi_tag_names, nil
}

func (s Server) GetImage(ctx context.Context, id int64) (*oapi.Image, error) {

	var oapi_image oapi.Image

	sqlc_image, err := s.db.GetImageByID(ctx, id)
	if err != nil {
		if err == pgx.ErrNoRows {
			return nil, nil //todo: error reference in db
		}
		return &oapi_image, fmt.Errorf("query GetImageByID: %v", err)
	}

	//can cast and dont use brain cause all this fields  required in image table
	oapi_image.Id = &sqlc_image.ID
	oapi_image.ImagePath = &sqlc_image.ImagePath
	storageTypeStr := string(sqlc_image.StorageType)
	oapi_image.StorageType = &storageTypeStr

	return &oapi_image, nil
}

func (s Server) GetStudio(ctx context.Context, id int64) (*oapi.Studio, error) {

	var oapi_studio oapi.Studio

	sqlc_studio, err := s.db.GetStudioByID(ctx, id)
	if err != nil {
		if err == pgx.ErrNoRows {
			return nil, nil
		}
		return &oapi_studio, fmt.Errorf("query GetStudioByID: %v", err)
	}

	oapi_studio.Id = sqlc_studio.ID
	oapi_studio.Name = sqlc_studio.StudioName
	oapi_studio.Description = sqlc_studio.StudioDesc

	if sqlc_studio.IllustID == nil {
		return &oapi_studio, nil
	}
	oapi_illust, err := s.GetImage(ctx, *sqlc_studio.IllustID)
	if err != nil {
		return &oapi_studio, fmt.Errorf("GetImage: %v", err)
	}
	if oapi_illust != nil {
		oapi_studio.Poster = oapi_illust
	}

	return &oapi_studio, nil
}

func (s Server) GetTitlesTitleId(ctx context.Context, request oapi.GetTitlesTitleIdRequestObject) (oapi.GetTitlesTitleIdResponseObject, error) {
	var oapi_title oapi.Title

	sqlc_title, err := s.db.GetTitleByID(ctx, request.TitleId)
	if err != nil {
		if err == pgx.ErrNoRows {
			return oapi.GetTitlesTitleId204Response{}, nil
		}
		log.Errorf("%v", err)
		return oapi.GetTitlesTitleId500Response{}, nil
	}
	_sqlc_title := sqlc.SearchTitlesRow{
		ID:                sqlc_title.ID,
		StudioID:          sqlc_title.StudioID,
		PosterID:          sqlc_title.PosterID,
		TitleStatus:       sqlc_title.TitleStatus,
		Rating:            sqlc_title.Rating,
		RatingCount:       sqlc_title.RatingCount,
		ReleaseYear:       sqlc_title.ReleaseYear,
		ReleaseSeason:     sqlc_title.ReleaseSeason,
		Season:            sqlc_title.Season,
		EpisodesAired:     sqlc_title.EpisodesAired,
		EpisodesAll:       sqlc_title.EpisodesAll,
		EpisodesLen:       sqlc_title.EpisodesLen,
		TitleStorageType:  sqlc_title.TitleStorageType,
		TitleImagePath:    sqlc_title.TitleImagePath,
		TagNames:          sqlc_title.TitleNames,
		StudioName:        sqlc_title.StudioName,
		StudioIllustID:    sqlc_title.StudioIllustID,
		StudioDesc:        sqlc_title.StudioDesc,
		StudioStorageType: sqlc_title.StudioStorageType,
		StudioImagePath:   sqlc_title.StudioImagePath,
	}
	oapi_title, err = s.mapTitle(ctx, _sqlc_title)
	if err != nil {
		log.Errorf("%v", err)
		return oapi.GetTitlesTitleId500Response{}, nil
	}

	return oapi.GetTitlesTitleId200JSONResponse(oapi_title), nil
}

func (s Server) GetTitles(ctx context.Context, request oapi.GetTitlesRequestObject) (oapi.GetTitlesResponseObject, error) {
	opai_titles := make([]oapi.Title, 0)

	word := Word2Sqlc(request.Params.Word)
	status, err := TitleStatus2Sqlc(request.Params.Status)
	if err != nil {
		log.Errorf("%v", err)
		return oapi.GetTitles400Response{}, err
	}

	season, err := ReleaseSeason2sqlc(request.Params.ReleaseSeason)
	if err != nil {
		log.Errorf("%v", err)
		return oapi.GetTitles400Response{}, err
	}

	params := sqlc.SearchTitlesParams{
		Word:          word,
		Ongoing:       status.ongoing,
		Finished:      status.finished,
		Planned:       status.planned,
		Rating:        request.Params.Rating,
		ReleaseYear:   request.Params.ReleaseYear,
		ReleaseSeason: season,
		Forward:       true,
		SortBy:        "id",
		Limit:         request.Params.Limit,
	}

	if request.Params.SortForward != nil {
		params.Forward = *request.Params.SortForward
	}
	if request.Params.Sort != nil {
		params.SortBy = string(*request.Params.Sort)
		if request.Params.Cursor != nil {
			err := ParseCursorInto(string(*request.Params.Sort), string(*request.Params.Cursor), &params)
			if err != nil {
				log.Errorf("%v", err)
				return oapi.GetTitles400Response{}, nil
			}
		}
	}
	// param = nil means it will not be used
	titles, err := s.db.SearchTitles(ctx, params)
	if err != nil {
		log.Errorf("%v", err)
		return oapi.GetTitles500Response{}, nil
	}
	if len(titles) == 0 {
		return oapi.GetTitles204Response{}, nil
	}

	var new_cursor oapi.CursorObj

	for _, title := range titles {

		t, err := s.mapTitle(ctx, title)
		if err != nil {
			log.Errorf("%v", err)
			return oapi.GetTitles500Response{}, nil
		}
		opai_titles = append(opai_titles, t)

		new_cursor.Id = t.Id
		if request.Params.Sort != nil {
			switch string(*request.Params.Sort) {
			case "year":
				tmp := fmt.Sprint("%d", *t.ReleaseYear)
				new_cursor.Param = &tmp
			case "rating":
				tmp := strconv.FormatFloat(*t.Rating, 'f', -1, 64)
				new_cursor.Param = &tmp
			}
		}
	}

	return oapi.GetTitles200JSONResponse{Cursor: new_cursor, Data: opai_titles}, nil
}