98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
package main
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import (
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"os"
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)
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type PriceRecord struct {
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MTGO map[string]PriceList `json:"mtgo,omitempty"`
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Paper map[string]PriceList `json:"paper,omitempty"`
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}
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type PricePoints struct {
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Normal map[string]float64 `json:"normal,omitempty"`
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Foil map[string]float64 `json:"foil,omitempty"`
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}
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type PriceList struct {
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Retail *PricePoints `json:"retail,omitempty"`
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Currency string `json:"currency"`
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Buylist *PricePoints `json:"buylist,omitempty"`
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}
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type PriceDB struct {
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Data map[string]PriceRecord `json:"data"`
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}
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type CardPriceEntry struct {
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UUID string `json:"uuid"`
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Price float64 `json:"price"`
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Currency string `json:"currency"`
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Seller string `json:"seller"`
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}
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func loadPrices(pricesFile string, priceFilter float64) func() ([]CardPriceEntry, error) {
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return func() ([]CardPriceEntry, error) {
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// Check if prices file exists
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_, err := os.Stat(pricesFile)
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if os.IsNotExist(err) {
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// Download prices file
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err = downloadFile(pricesURL, pricesFile)
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}
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if err != nil {
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return nil, err
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}
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// Read prices file
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var priceDB PriceDB
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err = readJSONFile(pricesFile, &priceDB)
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if err != nil {
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return nil, err
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}
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// Filter cards we care about
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entries := make([]CardPriceEntry, 0)
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for uuid, priceCatalog := range priceDB.Data {
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// Get all paper retail prices
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lowestPrice, currency, seller := getLowestPrice(priceCatalog.Paper)
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if priceFilter < lowestPrice {
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continue
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}
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entries = append(entries, CardPriceEntry{
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UUID: uuid,
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Price: lowestPrice,
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Currency: currency,
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Seller: seller,
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})
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}
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return entries, nil
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}
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}
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func getLowestPrice(sellers map[string]PriceList) (lowestPrice float64, currency string, seller string) {
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lowestPrice = 9999
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for cardSeller, priceList := range sellers {
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if priceList.Retail == nil {
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continue
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}
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for _, price := range priceList.Retail.Normal {
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if price < lowestPrice {
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lowestPrice = price
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currency = priceList.Currency
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seller = cardSeller
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}
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}
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for _, price := range priceList.Retail.Foil {
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if price < lowestPrice {
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lowestPrice = price
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currency = priceList.Currency
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seller = cardSeller
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}
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}
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}
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return
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}
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