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
}

func TitleStatus2Sqlc(s *oapi.TitleStatus) (*sqlc.TitleStatusT, error) {
	if s == nil {
		return nil, nil
	}
	var t sqlc.TitleStatusT
	switch *s {
	case oapi.TitleStatusFinished:
		t = sqlc.TitleStatusTFinished
	case oapi.TitleStatusOngoing:
		t = sqlc.TitleStatusTOngoing
	case oapi.TitleStatusPlanned:
		t = sqlc.TitleStatusTPlanned
	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) mapTitle(ctx context.Context, title sqlc.Title) (oapi.Title, error) {

	var oapi_title oapi.Title

	title_names := make(map[string][]string, 1)
	err := json.Unmarshal(title.TitleNames, &title_names)
	if err != nil {
		return oapi_title, fmt.Errorf("unmarshal TitleNames: %v", err)
	}

	episodes_lens := make(map[string]float64, 1)
	err = json.Unmarshal(title.EpisodesLen, &episodes_lens)
	if err != nil {
		return oapi_title, fmt.Errorf("unmarshal EpisodesLen: %v", err)
	}

	oapi_tag_names, err := s.GetTagsByTitleId(ctx, title.ID)
	if err != nil {
		return oapi_title, fmt.Errorf("GetTagsByTitleId: %v", err)
	}
	if oapi_tag_names != nil {
		oapi_title.Tags = oapi_tag_names
	}

	if title.PosterID != nil {
		oapi_image, err := s.GetImage(ctx, *title.PosterID)
		if err != nil {
			return oapi_title, fmt.Errorf("GetImage: %v", err)
		}
		if oapi_image != nil {
			oapi_title.Poster = oapi_image
		}
	}

	oapi_studio, err := s.GetStudio(ctx, title.StudioID)
	if err != nil {
		return oapi_title, fmt.Errorf("GetStudio: %v", err)
	}
	if oapi_studio != nil {
		oapi_title.Studio = oapi_studio
	}

	if title.ReleaseSeason != nil {
		rs := oapi.ReleaseSeason(*title.ReleaseSeason)
		oapi_title.ReleaseSeason = &rs
	} else {
		oapi_title.ReleaseSeason = nil
	}

	ts := oapi.TitleStatus(title.TitleStatus)
	oapi_title.TitleStatus = &ts

	oapi_title.Id = title.ID
	oapi_title.Rating = title.Rating
	oapi_title.RatingCount = title.RatingCount
	oapi_title.ReleaseYear = title.ReleaseYear
	oapi_title.TitleNames = title_names
	oapi_title.EpisodesAired = title.EpisodesAired
	oapi_title.EpisodesAll = title.EpisodesAll
	oapi_title.EpisodesLen = &episodes_lens

	return oapi_title, 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
	}

	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)

	// old_cursor := oapi.CursorObj{
	// 	Id: 1,
	// }

	// if request.Params.Cursor != nil {
	// 	if old_cursor, err := parseCursor(*request.Params.Cursor); err != nil {
	// 		log.Errorf("%v", err)
	// 		return oapi.GetTitles400Response{}, err
	// 	}
	// }

	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,
		Status:        status,
		Rating:        request.Params.Rating,
		ReleaseYear:   request.Params.ReleaseYear,
		ReleaseSeason: season,
		Forward:       true,
		SortBy:        "id",
		Limit:         request.Params.Limit,
	}

	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 := string(*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
}