package db

import (
	"context"
	"fmt"
	"strings"

	"github.com/henvic/pgq"
	"github.com/jackc/pgx/v5/pgtype"
)

type GetTopListLocationsParams struct {
	Limit      int32
	Offset     int32
	OrderBy    string
	RegionType pgtype.Int4
}

type GetTopListLocationsRow struct {
	RowNumber      int32       `json:"row_number"`
	ID             int32       `json:"id"`
	Name           string      `json:"name"`
	RegionName     string      `json:"region_name"`
	Thumbnail      pgtype.Text `json:"thumbnail"`
	Address        string      `json:"address"`
	GoogleMapsLink string      `json:"google_maps_link"`
	RegencyName    string      `json:"regency_name"`
	CriticScore    int16       `json:"critic_score"`
	CriticCount    int16       `json:"critic_count"`
	UserScore      int16       `json:"user_score"`
	UserCount      int16       `json:"user_count"`
	TotalCount     int16       `json:"total_count"`
	CriticBayes    int16       `json:"critic_bayes"`
	UserBayes      int16       `json:"user_bayes"`
	AvgBayes       int16       `json:"avg_bayes"`
}

func (q *Queries) GetTopListLocations(ctx context.Context, arg GetTopListLocationsParams) ([]GetTopListLocationsRow, error) {
	regionType := ""

	if arg.RegionType.Valid {
		regionType = fmt.Sprintf("AND reg.id = %d", arg.RegionType.Int32)
	}

	//  https://fulmicoton.com/posts/bayesian_rating/
	getTopListQ := fmt.Sprintf(`SELECT 	
	row_number() over (ORDER BY %s DESC) as row_number,
		*
	FROM(
	SELECT
			*,
			(SELECT 5 * 5 + COALESCE(critic_score, 0) * COALESCE(critic_count, 0) / 5 + COALESCE(critic_count, 0)) as critic_bayes,
			(SELECT 5 * 5 + COALESCE(user_score, 0) * COALESCE(user_count, 0) / 5  + COALESCE(user_count, 0)) as user_bayes,
			((SELECT 5 * 5 + COALESCE(user_score, 0) * COALESCE(user_count, 0) / 50 + COALESCE(user_count, 0)) + (SELECT 5 * 5 + COALESCE(critic_score, 0) * COALESCE(critic_count, 0) / 5 + COALESCE(critic_count, 0)) ) / 2 as avg_bayes

	FROM (
			SELECT
					l.id,
					name,
					l.address,
					reg.region_name as region_name,
					l.google_maps_link,
					thumbnail,
					re.regency_name,
					(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_score,
					(SELECT COUNT(id) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_count,
					(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_score,
					(SELECT COUNT(id) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_count
			FROM locations l
			JOIN regencies re on re.id = l.regency_id
			JOIN provinces prov on prov.id = re.province_id
			JOIN regions reg on reg.id = prov.region_id
			WHERE approved_by IS NOT NULL %s ) iq1 ) iq2
	LIMIT $1
	OFFSET $2;`, arg.OrderBy, regionType)

	rows, err := q.db.Query(ctx, getTopListQ, arg.Limit, arg.Offset)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	items := []GetTopListLocationsRow{}
	for rows.Next() {
		var i GetTopListLocationsRow
		if err := rows.Scan(
			&i.RowNumber,
			&i.ID,
			&i.Name,
			&i.Address,
			&i.RegionName,
			&i.GoogleMapsLink,
			&i.Thumbnail,
			&i.RegencyName,
			&i.CriticScore,
			&i.CriticCount,
			&i.UserScore,
			&i.UserCount,
			&i.CriticBayes,
			&i.UserBayes,
			&i.AvgBayes,
		); err != nil {
			return nil, err
		}
		i.TotalCount = i.UserCount + i.CriticCount
		items = append(items, i)
	}
	rows.Close()
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return items, nil
}

type GetListRecentLocationsWithRatingsRow struct {
	ID           int32       `json:"id"`
	Name         string      `json:"name"`
	Thumbnail    pgtype.Text `json:"thumbnail"`
	LocationType pgtype.Text `json:"location_type"`
	RegencyName  string      `json:"regency_name"`
	ProvinceName string      `json:"province_name"`
	CriticScore  interface{} `json:"critic_score"`
	CriticCount  int64       `json:"critic_count"`
	UserScore    interface{} `json:"user_score"`
	UserCount    int64       `json:"user_count"`
}

type GetListRecentLocationsParams struct {
	Limit         int32  `json:"limit" default:"12"`
	Regions       string `json:"regions" default:""`
	LocationTypes string `json:"location_type" default:""`
}

func (q *Queries) GetListRecentLocationsWithRatings(ctx context.Context, arg GetListRecentLocationsParams) ([]GetListRecentLocationsWithRatingsRow, error) {
	sqlBuilder := pgq.Select(
		"l.id",
		"name",
		"thumbnail",
		"l.location_type",
		"COALESCE(re.regency_name, '') as regency_name",
		"COALESCE(pr.province_name, '') as province_name",
		"(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_score",
		"(SELECT COUNT(id) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_count",
		"(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_score",
		"(SELECT COUNT(id) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_count",
	).
		From("locations l").
		Join("regencies re on re.id = l.regency_id").
		Join("provinces pr on re.province_id = pr.id").
		Limit(uint64(arg.Limit))

	if arg.Regions != "" {
		region := strings.Split(arg.Regions, ",")
		sqlBuilder = sqlBuilder.Where(pgq.Eq{"re.id": region})
	}

	if arg.LocationTypes != "" {
		locType := strings.Split(arg.LocationTypes, ",")
		sqlBuilder = sqlBuilder.Where(pgq.Eq{"l.location_type": locType})
	}

	query, arguments, err := sqlBuilder.Where(pgq.NotEq{"approved_by": nil}).SQL()

	if err != nil {
		return nil, err
	}

	rows, err := q.db.Query(ctx, query, arguments...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	items := []GetListRecentLocationsWithRatingsRow{}
	for rows.Next() {
		var i GetListRecentLocationsWithRatingsRow
		if err := rows.Scan(
			&i.ID,
			&i.Name,
			&i.Thumbnail,
			&i.LocationType,
			&i.RegencyName,
			&i.ProvinceName,
			&i.CriticScore,
			&i.CriticCount,
			&i.UserScore,
			&i.UserCount,
		); err != nil {
			return nil, err
		}
		items = append(items, i)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return items, nil
}

type GetLocationRow struct {
	ID             int32       `json:"id"`
	Name           string      `json:"name"`
	Address        string      `json:"address"`
	RegencyName    string      `json:"regency_name"`
	ProvinceName   string      `json:"province_name"`
	RegionName     string      `json:"region_name"`
	GoogleMapsLink string      `json:"google_maps_link"`
	Thumbnail      pgtype.Text `json:"thumbnail"`
	SubmittedBy    string      `json:"submitted_by"`
	CriticScore    int32       `json:"critic_score"`
	CriticCount    int32       `json:"critic_count"`
	UserScore      int32       `json:"user_score"`
	UserCount      int32       `json:"user_count"`
}

var getLocationQ = `
	SELECT
		l.id,
		name,
		l.address,
		COALESCE(re.regency_name, '') as regency_name,
		COALESCE(prov.province_name, '') as province_name,
		COALESCE(reg.region_name, '') as region_name,
		COALESCE(l.google_maps_link, '') as google_maps_link,
		thumbnail,
		u.username as submitted_by,
		(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_score,
		(SELECT COUNT(id) from reviews re where re.is_from_critic = true and re.location_id = l.id) as critic_count,
		(SELECT COALESCE(SUM(score), 0) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_score,
		(SELECT COUNT(id) from reviews re where re.is_from_critic = false and re.location_id = l.id) as user_count
	FROM locations l
	JOIN regencies re on re.id = l.regency_id
	JOIN provinces prov on prov.id = re.province_id
	JOIN regions reg on reg.id = prov.region_id
	JOIN users u on u.id = l.submitted_by
	WHERE l.id = $1
`

func (q *Queries) GetLocation(ctx context.Context, location_id int32) (GetLocationRow, error) {
	row := q.db.QueryRow(ctx, getLocationQ, location_id)
	var i GetLocationRow

	err := row.Scan(
		&i.ID,
		&i.Name,
		&i.Address,
		&i.RegencyName,
		&i.ProvinceName,
		&i.RegionName,
		&i.GoogleMapsLink,
		&i.Thumbnail,
		&i.SubmittedBy,
		&i.CriticScore,
		&i.CriticCount,
		&i.UserScore,
		&i.UserCount,
	)

	return i, err
}

const createLocation = `-- name: CreateLocation :exec
INSERT INTO locations(
  address,
  name,
  submitted_by,
  location_type,
  regency_id,
  google_maps_link,
	approved_by,
	is_deleted
) values (
  $1, $2, $3, $4, $5, $6, $7, $8
) 
RETURNING id
`

type CreateLocationParams struct {
	Address        string       `json:"address"`
	Name           string       `json:"name"`
	SubmittedBy    int32        `json:"submitted_by"`
	LocationType   LocationType `json:"location_type"`
	RegencyID      int16        `json:"regency_id"`
	GoogleMapsLink pgtype.Text  `json:"google_maps_link"`
	IsDeleted      bool         `json:"is_deleted"`
	ApprovedBy     pgtype.Int4  `json:"approved_by"`
}

func (q *Queries) CreateLocation(ctx context.Context, arg CreateLocationParams) (int32, error) {
	row := q.db.QueryRow(ctx, createLocation,
		arg.Address,
		arg.Name,
		arg.SubmittedBy,
		arg.LocationType,
		arg.RegencyID,
		arg.GoogleMapsLink,
		arg.ApprovedBy,
		arg.IsDeleted,
	)

	var i int32

	err := row.Scan(
		&i,
	)

	fmt.Println(i)

	return i, err
}