session-ios/Session/Calls/Call Management/SessionCallManager+CXProvider.swift

import CallKit

extension SessionCallManager: CXProviderDelegate {
    public func providerDidReset(_ provider: CXProvider) {
        AssertIsOnMainThread()
        currentCall?.endSessionCall()
    }
    
    public func provider(_ provider: CXProvider, perform action: CXStartCallAction) {
        AssertIsOnMainThread()
        guard let call = self.currentCall else { return action.fail() }
        call.startSessionCall(completion: nil)
        action.fulfill()
    }
    
    public func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {
        AssertIsOnMainThread()
        guard let _ = self.currentCall else { return action.fail() }
        let userDefaults = UserDefaults.standard
        if userDefaults[.hasSeenCallIPExposureWarning] {
            showCallVC()
        } else {
            showCallModal()
        }
        action.fulfill()
    }
    
    public func provider(_ provider: CXProvider, perform action: CXEndCallAction) {
        AssertIsOnMainThread()
        guard let call = self.currentCall else { return action.fail() }
        call.endSessionCall()
        reportCurrentCallEnded(reason: nil)
        action.fulfill()
    }
    
    public func provider(_ provider: CXProvider, perform action: CXSetHeldCallAction) {
        // TODO: set on hold
    }
    
    public func provider(_ provider: CXProvider, timedOutPerforming action: CXAction) {
        // TODO: handle timeout
    }
}