// MIT License
//
// Copyright (c) 2017 Wesley Wickwire
//
// 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
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// 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
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

public struct PropertyInfo {
    
    public let name: String
    public let type: Any.Type
    public let isVar: Bool
    public let offset: Int
    public let ownerType: Any.Type
    
    public func set<TObject>(value: Any, on object: inout TObject) throws {
        try withValuePointer(of: &object) { pointer in
            try set(value: value, pointer: pointer)
        }
    }
    
    public func set(value: Any, on object: inout Any) throws {
        try withValuePointer(of: &object) { pointer in
            try set(value: value, pointer: pointer)
        }
    }
    
    public func set(value: Any, pointer: UnsafeMutableRawPointer) throws {
        let valuePointer = pointer.advanced(by: offset)
        let sets = setters(type: type)
        sets.set(value: value, pointer: valuePointer)
    }
    
    public func get<TValue>(from object: Any) throws -> TValue {
        if let value = try get(from: object) as? TValue {
            return value
        }
        
        throw RuntimeError.errorGettingValue(name: name, type: type)
    }
    
    public func get(from object: Any) throws -> Any {
        var object = object
        return try withValuePointer(of: &object) { pointer in
            let valuePointer = pointer.advanced(by: offset)
            let gets = getters(type: type)
            return gets.get(from: valuePointer)
        }
    }
}

extension PropertyInfo: Equatable {
    public static func == (lhs: PropertyInfo, rhs: PropertyInfo) -> Bool {
        return lhs.name == rhs.name
            && lhs.type == rhs.type
            && lhs.isVar == rhs.isVar
            && lhs.offset == rhs.offset
            && lhs.ownerType == rhs.ownerType
    }
}
