//
//  Copyright (c) 2023 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
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//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

public struct AnySingleValueStorage<ValueType, ErrorType: Error>: SingleValueStorage {
    public typealias HasValueClosure = () -> Bool
    public typealias GetValueClosure = () -> Result<ValueType, ErrorType>
    public typealias StoreValueClosure = (ValueType) -> Result<Void, ErrorType>
    public typealias DeleteValueClosure = () -> Result<Void, ErrorType>

    private let hasValueClosure: HasValueClosure
    private let deleteValueClosure: DeleteValueClosure
    private let getValueClosure: GetValueClosure
    private let storeValueClosure: StoreValueClosure

    public init<Storage: SingleValueStorage>(storage: Storage)
    where Storage.ValueType == ValueType, Storage.ErrorType == ErrorType {

        self.hasValueClosure = storage.hasStoredValue
        self.deleteValueClosure = storage.deleteValue
        self.getValueClosure = storage.getValue
        self.storeValueClosure = storage.store
    }

    public func hasStoredValue() -> Bool {
        hasValueClosure()
    }

    public func store(value: ValueType) -> Result<Void, ErrorType> {
        storeValueClosure(value)
    }

    public func getValue() -> Result<ValueType, ErrorType> {
        getValueClosure()
    }

    public func deleteValue() -> Result<Void, ErrorType> {
        deleteValueClosure()
    }
}

public extension SingleValueStorage {
    func eraseToAnySingleValueStorate() -> AnySingleValueStorage<ValueType, ErrorType> {
        AnySingleValueStorage(storage: self)
    }
}