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Merge pull request #364 from moneymanagerex/rate
Currency: supprt sync rate per currency with limited base currency
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // CurrencyRateFetcher.swift | ||
| // MMEX | ||
| // | ||
| // Created by Lisheng Guan on 2025/2/25. | ||
| // | ||
|
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| import Foundation | ||
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| // Define the structure of the response to match the JSON structure | ||
| struct CurrencyRateResponse: Decodable { | ||
| let result: String | ||
| let base_code: String | ||
| let conversion_rates: [String: Double] // The conversion rates dictionary | ||
| } | ||
|
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| struct CurrencyRateFetcher { | ||
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| private var baseCurrency: String | ||
| private let validBaseCurrencies = ["USD", "EUR", "GBP", "CNY", "AUD"] | ||
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| // Computed property to dynamically check if the base currency is valid | ||
| var isValid: Bool { | ||
| return validBaseCurrencies.contains(baseCurrency) | ||
| } | ||
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| // Default initializer with "USD" as the base currency | ||
| init(baseCurrency: String = "USD") { | ||
| self.baseCurrency = baseCurrency | ||
| } | ||
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| // Method to update the base currency | ||
| mutating func setBaseCurrency(_ newBaseCurrency: String) { | ||
| self.baseCurrency = newBaseCurrency | ||
| } | ||
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| // Function to fetch conversion rate for a given target currency | ||
| func fetchConversionRate(for targetCurrency: String) async throws -> Double { | ||
| guard isValid else { | ||
| throw NSError(domain: "CurrencyRateFetcher", code: 400, userInfo: [NSLocalizedDescriptionKey: "Base currency is invalid."]) | ||
| } | ||
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| let urlString = "https://moneymanagerex.org/currency/data/latest_\(baseCurrency).json" | ||
| guard let url = URL(string: urlString) else { | ||
| throw URLError(.badURL) | ||
| } | ||
|
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| let (data, _) = try await URLSession.shared.data(from: url) | ||
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| let decoder = JSONDecoder() | ||
| let response = try decoder.decode(CurrencyRateResponse.self, from: data) | ||
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| guard let directRate = response.conversion_rates[targetCurrency] else { | ||
| throw NSError(domain: "CurrencyRateFetcher", code: 404, userInfo: [NSLocalizedDescriptionKey: "Currency not found."]) | ||
| } | ||
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| // If the base currency is the same as the response, direct rate is already provided | ||
| let indirectRate = 1.0 / directRate | ||
|
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| return indirectRate | ||
| } | ||
| } |
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