import Foundation

// ─────────────────────────────────────────────────────────────
// Function Calling API Models
// OpenAI Compatible Format
// ─────────────────────────────────────────────────────────────

/// Tool definition
public struct Tool: Codable {
    public let type: String
    public let function: FunctionDefinition
    
    public init(type: String = "function", function: FunctionDefinition) {
        self.type = type
        self.function = function
    }
}

/// Function definition
public struct FunctionDefinition: Codable {
    public let name: String
    public let description: String?
    public let parameters: FunctionParameters?
    
    public init(
        name: String,
        description: String? = nil,
        parameters: FunctionParameters? = nil
    ) {
        self.name = name
        self.description = description
        self.parameters = parameters
    }
}

/// Function parameters (JSON Schema)
public struct FunctionParameters: Codable {
    public let type: String
    public let properties: [String: PropertySchema]?
    public let required: [String]?
    
    public init(
        type: String = "object",
        properties: [String: PropertySchema]? = nil,
        required: [String]? = nil
    ) {
        self.type = type
        self.properties = properties
        self.required = required
    }
}

/// Property schema
public struct PropertySchema: Codable {
    public let type: String
    public let description: String?
    public let `enum`: [String]?
    
    public init(
        type: String,
        description: String? = nil,
        enum: [String]? = nil
    ) {
        self.type = type
        self.description = description
        self.enum = `enum`
    }
}

/// Tool call in response
public struct ToolCall: Codable, Sendable {
    public let id: String
    public let type: String
    public let function: FunctionCall
    
    public init(
        id: String = "call_\(UUID().uuidString.replacingOccurrences(of: "-", with: "").prefix(9))",
        type: String = "function",
        function: FunctionCall
    ) {
        self.id = id
        self.type = type
        self.function = function
    }
}

/// Function call
public struct FunctionCall: Codable, Sendable {
    public let name: String
    public let arguments: String
    
    public init(name: String, arguments: String) {
        self.name = name
        self.arguments = arguments
    }
}

/// Tool message
public struct ToolMessage: Codable {
    public let role: String
    public let content: String?
    public let tool_call_id: String?
    public let name: String?
    
    public init(
        role: String = "tool",
        content: String?,
        tool_call_id: String?,
        name: String?
    ) {
        self.role = role
        self.content = content
        self.tool_call_id = tool_call_id
        self.name = name
    }
}