package accounts

import (
	"context"
	"errors"
	"fmt"
	"ruben/inventory2/internal/consts"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgtype"
)

type (
	MockShop struct {
		AccountShopIDs
		Name string
	}

	MockListing struct {
		AccountShopListingIDs
		SKU         string
		Name        string
		Description string
		Count       int64
	}
)

func (db *Store) CreateMockShop(ctx context.Context, acctID int64, platform Platform, name string) (shopID uuid.UUID, err error) {
	shopTableName, err := getMockShopTableName(platform)
	if err != nil {
		return uuid.Nil, err
	}

	tx, err := db.db.Begin(ctx)
	if err != nil {
		return uuid.Nil, fmt.Errorf("failed to being transaction: %w", err)
	}
	defer tx.Rollback(ctx)

	// TODO: are we really going to just copy the id between accounts and mock.accounts?

	// upsert mock account

	rows, err := tx.Query(
		ctx,
		`
			WITH existing_account(account_id, user_id) AS (
				SELECT
					account_id,
					user_id
				FROM
					accounts
				WHERE
					account_id = @account_id
			), existing_mock_account AS (
				SELECT
					user_id
				FROM
					accounts
				WHERE
					account_id = @account_id
			), inserted_mock_account AS (
				INSERT INTO
					mock.accounts (
						account_id,
						user_id
					)
				SELECT
					account_id,
					user_id
				FROM
					existing_account
				ON CONFLICT
					DO NOTHING
				RETURNING
					user_id
			)
			SELECT
				COALESCE(ia.user_id, ea.user_id)
			FROM
				inserted_mock_account ia
			FULL OUTER JOIN
				existing_mock_account ea
			USING
				(user_id)
		`,
		pgx.NamedArgs{
			"account_id": acctID,
		},
	)
	if err != nil {
		return uuid.Nil, fmt.Errorf("failed to perform query: %w", err)
	}

	userID, err := pgx.CollectExactlyOneRow(rows, pgx.RowTo[string])
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return uuid.Nil, fmt.Errorf("%w: account not found", consts.ErrNotFound)
		}
		return uuid.Nil, fmt.Errorf("failed to scan rows: %w", err)
	}

	// create the mock shop

	shopID = uuid.New()

	_, err = tx.Exec(
		ctx,
		fmt.Sprintf(
			`
				INSERT INTO
					%s (
						user_id,
						account_id,
						shop_id,
						name
					)
				VALUES (
					@user_id,
					@account_id,
					@shop_id,
					@name
				)
			`,
			shopTableName,
		),
		pgx.NamedArgs{
			"account_id": acctID,
			"user_id":    userID,
			"shop_id":    shopID,
			"name":       name,
		},
	)
	if err != nil {
		return uuid.Nil, fmt.Errorf("failed to perform query to create mock shop: %w", err)
	}

	if err := tx.Commit(ctx); err != nil {
		return uuid.Nil, fmt.Errorf("failed to commit transaction: %w", err)
	}

	return shopID, nil
}

func (db *Store) ListMockShopsForPlatform(ctx context.Context, acctID int64, platform Platform) ([]MockShop, error) {
	shopTableName, err := getMockShopTableName(platform)
	if err != nil {
		return nil, err
	}

	rows, err := db.db.Query(
		ctx,
		fmt.Sprintf(
			`
				SELECT
					shop_id,
					name
				FROM
					%s
				WHERE
					account_id = @account_id
			`,
			shopTableName,
		),
		pgx.NamedArgs{
			"account_id": acctID,
		},
	)
	if err != nil {
		return nil, fmt.Errorf("failed to perform query: %w", err)
	}

	vs, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[struct {
		Shop_id uuid.UUID
		Name    string
	}])
	if err != nil {
		return nil, fmt.Errorf("failed to scan rows: %w", err)
	}

	shops := make([]MockShop, len(vs))
	for i, v := range vs {
		shops[i] = MockShop{
			AccountShopIDs: AccountShopIDs{
				AccountIDs: AccountIDs{
					AccountID: acctID,
				},
				Platform: platform,
				ShopID:   v.Shop_id.String(),
			},
			Name: v.Name,
		}
	}

	return shops, nil
}

func (db *Store) GetMockShop(ctx context.Context, acctID int64, platform Platform, shopID string) (*MockShop, error) {
	shopTableName, err := getMockShopTableName(platform)
	if err != nil {
		return nil, err
	}

	rows, err := db.db.Query(
		ctx,
		fmt.Sprintf(
			`
				SELECT
					name
				FROM
					%s
				WHERE
					account_id = @account_id
					AND shop_id = @shop_id
			`,
			shopTableName,
		),
		pgx.NamedArgs{
			"account_id": acctID,
			"shop_id":    shopID,
		},
	)
	if err != nil {
		return nil, fmt.Errorf("failed to perform query: %w", err)
	}

	name, err := pgx.CollectExactlyOneRow(rows, pgx.RowTo[string])
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, consts.ErrNotFound
		}
		return nil, fmt.Errorf("failed to scan rows: %w", err)
	}

	return &MockShop{
		AccountShopIDs: AccountShopIDs{
			AccountIDs: AccountIDs{
				AccountID: acctID,
			},
			Platform: platform,
			ShopID:   shopID,
		},
		Name: name,
	}, nil
}

func (db *Store) CreateMockListing(ctx context.Context, listing MockListing) (MockListing, error) {
	shopTableName, listingTableName, err := getMockShopAndListingsTableNames(listing.Platform)
	if err != nil {
		return MockListing{}, err
	}

	listing.ListingID = uuid.New().String()

	tag, err := db.db.Exec(
		ctx,
		fmt.Sprintf(
			`
				WITH existing_shop(account_id, shop_id) AS (
					SELECT
						account_id,
						shop_id
					FROM
						%s
					WHERE
						account_id = @account_id
						AND shop_id = @shop_id
				), new_values(listing_id, sku, name, description, "count") AS (
					SELECT
						@listing_id::text,
						@sku::text,
						@name::text,
						@description::text,
						@count::integer
				)
				INSERT INTO
					%s (
						account_id,
						shop_id,
						listing_id,
						sku,
						name,
						description,
						count
					)
				SELECT
					account_id,
					shop_id,
					listing_id,
					sku,
					name,
					description,
					"count"
				FROM
					existing_shop
				JOIN
					new_values
				ON
					true
			`,
			shopTableName,
			listingTableName,
		),
		pgx.NamedArgs{
			"account_id":  listing.AccountID,
			"shop_id":     listing.ShopID,
			"listing_id":  listing.ListingID,
			"sku":         listing.SKU,
			"name":        listing.Name,
			"description": listing.Description,
			"count":       listing.Count,
		},
	)
	if err != nil {
		return MockListing{}, fmt.Errorf("failed to perform query: %w", err)
	}
	if tag.RowsAffected() == 0 {
		return MockListing{}, fmt.Errorf("%w: shop not found", consts.ErrNotFound)
	}

	return listing, nil
}

// UpdateMockListing updates a mock listing, but not it's count
func (db *Store) UpdateMockListing(ctx context.Context, listing MockListing) error {
	_, listingTableName, err := getMockShopAndListingsTableNames(listing.Platform)
	if err != nil {
		return err
	}

	tag, err := db.db.Exec(
		ctx,
		fmt.Sprintf(
			`
				UPDATE
					%s
				SET
					sku = @sku,
					name = @name,
					description = @description
				WHERE
					account_id = @account_id
					AND shop_id = @shop_id
					AND listing_id = @listing_id
			`,
			listingTableName,
		),
		pgx.NamedArgs{
			"account_id":  listing.AccountID,
			"shop_id":     listing.ShopID,
			"listing_id":  listing.ListingID,
			"sku":         listing.SKU,
			"name":        listing.Name,
			"description": listing.Description,
		},
	)
	if err != nil {
		return fmt.Errorf("failed to perform query: %w", err)
	}
	if tag.RowsAffected() == 0 {
		return fmt.Errorf("%w: listing not found", consts.ErrNotFound)
	}

	return nil
}

func (db *Store) ListMockListingsForShop(ctx context.Context, acctID int64, platform Platform, shopID string) ([]MockListing, error) {
	shopTableName, listingsTableName, err := getMockShopAndListingsTableNames(platform)
	if err != nil {
		return nil, err
	}

	rows, err := db.db.Query(
		ctx,
		fmt.Sprintf(
			`
				WITH shop_exists(shop_exists) AS (
					SELECT
						true
					FROM
						%s
					WHERE
						account_id = @account_id
						AND shop_id = @shop_id
				)
				SELECT
					COALESCE(shop_exists, false) AS shop_exists,
					listing_id,
					sku,
					name,
					description,
					"count"
				FROM
					shop_exists
				LEFT JOIN
					%s
				ON
					TRUE
				WHERE
					(account_id IS NULL OR account_id = @account_id)
					AND (shop_id IS NULL OR shop_id = @shop_id)
			`,
			shopTableName,
			listingsTableName,
		),
		pgx.NamedArgs{
			"account_id": acctID,
			"shop_id":    shopID,
		},
	)
	if err != nil {
		return nil, fmt.Errorf("failed to perform query: %w", err)
	}

	vs, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[struct {
		Shop_exists bool
		Listing_id  pgtype.Text
		SKU         pgtype.Text
		Name        pgtype.Text
		Description pgtype.Text
		Count       pgtype.Int8
	}])
	if err != nil {
		return nil, fmt.Errorf("failed to scan rows: %w", err)
	}

	// check if the shop exists, and confirm there were actually listings (LEFT JOIN)

	if len(vs) == 0 || !vs[0].Shop_exists {
		fmt.Println("TEST")
		return nil, fmt.Errorf("%w: shop not found", consts.ErrNotFound)
	}
	if !vs[0].SKU.Valid {
		return nil, nil
	}

	listings := make([]MockListing, len(vs))
	for i, v := range vs {
		listings[i] = MockListing{
			AccountShopListingIDs: AccountShopListingIDs{
				AccountShopIDs: AccountShopIDs{
					AccountIDs: AccountIDs{
						AccountID: acctID,
					},
					Platform: platform,
					ShopID:   shopID,
				},
				ListingID: v.Listing_id.String,
			},
			SKU:         v.SKU.String,
			Name:        v.Name.String,
			Description: v.Description.String,
			Count:       v.Count.Int64,
		}
	}

	return listings, nil
}

func getMockShopTableName(platform Platform) (string, error) {
	switch platform {
	case Amazon:
		return "mock.shop_amazon", nil
	case BigCartel:
		return "mock.shop_big_cartel", nil
	case Ebay:
		return "mock.shop_ebay", nil
	case Ecwid:
		return "mock.shop_ecwid", nil
	case Etsy:
		return "mock.shop_etsy", nil
	case Shopify:
		return "mock.shop_shopify", nil
	case SquareOnline:
		return "mock.shop_square_online", nil
	case Squarespace:
		return "mock.shop_squarespace", nil
	case Tiktok:
		return "mock.shop_tiktok", nil
	case WalmartMarketplace:
		return "mock.shop_walmart_marketplace", nil
	case Wix:
		return "mock.shop_wix", nil
	case WooCommerce:
		return "mock.shop_woo_commerce", nil
	case Zoho:
		return "mock.shop_zoho", nil
	default:
		return "", fmt.Errorf("%w: unrecognized platform", consts.ErrBadRequest)
	}
}

func getMockShopAndListingsTableNames(platform Platform) (shop string, listing string, err error) {
	shop, err = getMockShopTableName(platform)
	if err != nil {
		return "", "", err
	}

	return shop, shop + "_listings", nil

}