import groovy.json.JsonBuilder

class AndroidHelper {

    static def saveProcessedConfig(project, config) {
        def path = project.file("assets/config")
        path.mkdirs()
        def jsonWriter = new FileWriter(path.absolutePath + "/config.json")
        def builder = new JsonBuilder(config)
        jsonWriter.withWriter {
            builder.writeTo(it)
        }
    }

    static def saveGoogleServicesJson(project, firebaseConfig) {
        def googleServiceJsonPath = project.projectDir.toString() + "/google-services.json"
        new FileWriter(googleServiceJsonPath).withWriter {
            getGoogleServicesContent(project, firebaseConfig).writeTo(it)
        }
    }

    static def getGoogleServicesContent(project, firebaseConfig) {
        if (checkRequiredFields(firebaseConfig)) {
            def jsonBuilder = new JsonBuilder()
            def projectNumber = firebaseConfig.get("PROJECT_NUMBER")
            def projectId = firebaseConfig.get("PROJECT_ID")
            def oauthClientId = firebaseConfig.get("OAUTH_CLIENT_ID")
            def currentKey = firebaseConfig.get("CURRENT_KEY")
            def mobileSdkAppId = firebaseConfig.get("MOBILE_SDK_APP_ID")
            // construct the google-services.json fields
            jsonBuilder {
                project_info {
                    project_number projectNumber
                    firebase_url "https://$projectId" + ".firebaseio.com"
                    project_id projectId
                    storage_bucket projectId + ".appspot.com"
                }
                client([{
                            client_info {
                                "mobilesdk_app_id" mobileSdkAppId
                                "android_client_info" {
                                    "package_name" project.APPLICATION_ID
                                }
                            }
                            oauth_client([
                                    {
                                        "client_id" oauthClientId
                                        "client_type" 3
                                    }
                            ])
                            api_key(
                                    [{
                                         "current_key" currentKey
                                     }])
                            services {
                                appinvite_service {
                                    other_platform_oauth_client([{
                                                                     "client_id" oauthClientId
                                                                     "client_type" 3
                                                                 }
                                    ])
                                }
                            }
                        }])
                configuration_version "1"
            }
            return jsonBuilder
        }
    }

    static def checkRequiredFields(firebaseConfig) {
        def available = true
        def message = ""
        if (!firebaseConfig.get("PROJECT_NUMBER")) {
            message += 'FIREBASE:PROJECT_NUMBER is missing or empty\n'
            available = false
        }

        if (!firebaseConfig.get("PROJECT_ID")) {
            message += 'FIREBASE:PROJECT_ID is missing or empty\n'
            available = false
        }

        if (!firebaseConfig.get("OAUTH_CLIENT_ID")) {
            message += 'FIREBASE:OAUTH_CLIENT_ID is missing or empty\n'
            available = false
        }

        if (!firebaseConfig.get("CURRENT_KEY")) {
            message += 'FIREBASE:CURRENT_KEY is missing or empty\n'
            available = false
        }
        if (!firebaseConfig.get("MOBILE_SDK_APP_ID")) {
            message += 'FIREBASE:MOBILE_SDK_APP_ID is missing or empty\n'
            available = false
        }
        if (!available) {
            throw new GradleException(message)
        }
        return available
    }

    static def saveMicrosoftAuthConfigs(project, microsoftConfig) {
        def microsoftConfigsJsonPath = project.projectDir.toString() + "/res/raw/auth_config.json"
        new FileWriter(microsoftConfigsJsonPath).withWriter {
            getMicrosoftConfigurations(project, microsoftConfig).writeTo(it)
        }
    }

    static def getMicrosoftConfigurations(project, microsoftConfig) {
        if (isValidConfigurations(microsoftConfig)) {
            def jsonBuilder = new JsonBuilder()
            def clientId = microsoftConfig.get("CLIENT_ID")
            def signatureHash = microsoftConfig.get("SIGNATURE_HASH")
            def audienceType = microsoftConfig.get("AUDIENCE_TYPE")
            def tenantId = microsoftConfig.get("TENANT_ID")
            jsonBuilder {
                "client_id" "$clientId"
                "authorization_user_agent" "DEFAULT"
                "redirect_uri" "msauth://" + project.APPLICATION_ID + "/" + URLEncoder.encode(signatureHash, "UTF-8")
                "broker_redirect_uri_registered" false
                "account_mode" "MULTIPLE"
                authorities([{
                                 "type" "AAD"
                                 audience {
                                     "type" "$audienceType"
                                     "tenant_id" "$tenantId"
                                 }
                             }])
            }
            return jsonBuilder
        }
    }

    static def isValidConfigurations(microsoftConfig) {
        def available = true
        def message = ""
        if (!microsoftConfig.get("CLIENT_ID")) {
            message += 'MICROSOFT:CLIENT_ID is missing or empty\n'
            available = false
        }

        if (!microsoftConfig.get("SIGNATURE_HASH")) {
            message += 'MICROSOFT:SIGNATURE_HASH is missing or empty\n'
            available = false
        }

        if (!microsoftConfig.get("AUDIENCE_TYPE")) {
            message += 'MICROSOFT:AUDIENCE_TYPE is missing or empty\n'
            available = false
        }

        if (!microsoftConfig.get("TENANT_ID")) {
            message += 'MICROSOFT:TENANT_ID is missing or empty\n'
            available = false
        }

        if (!available) {
            throw new GradleException(message)
        }
        return available
    }

    /**
     * Utility method to check that the mandatory file existence, that shows unused by the
     * android studio.
     * */
    static def checkRequiredFileExistence(project) {
        def mandatoryFiles = getListOfMandatoryFiles()
        for (item in mandatoryFiles) {
            if (!new File(project.projectDir.toString() + item.filePath).exists()) {
                throw new GradleException(item.errorMessage)
            }
        }
    }

    static def getListOfMandatoryFiles() {
        def list = new ArrayList()
        def file = new MandatoryFile("/src/main/java/org/edx/mobile/googlecast/CastOptionsProvider.java",
                "App must implement the OptionsProvider interface to supply options needed to initialize the CastContext singleton.",
                "https://developers.google.com/cast/docs/android_sender/integrate#initialize_the_cast_context")
        list.add(file)
        return list
    }
}


/**
 * Class having file information that are mandatory for the codebase but android studio shows
 * them unused.
 */
class MandatoryFile {
    String filePath
    String errorMessage

    MandatoryFile(filePath, errorMessage, refLink) {
        this.filePath = filePath
        this.errorMessage = errorMessage + "\nReference: " + refLink
    }
}

ext.AndroidHelper = AndroidHelper