import com.sap.piper.SidecarUtils

import static com.sap.piper.Prerequisites.checkScript

import com.cloudbees.groovy.cps.NonCPS
import com.sap.piper.ConfigurationHelper
import com.sap.piper.GenerateDocumentation
import com.sap.piper.JenkinsUtils
import com.sap.piper.Utils
import com.sap.piper.k8s.ContainerMap
import groovy.transform.Field

@Field def STEP_NAME = getClass().getName()
@Field def PLUGIN_ID_DOCKER_WORKFLOW = 'docker-workflow'

@Field Set GENERAL_CONFIG_KEYS = []
@Field Set STEP_CONFIG_KEYS = GENERAL_CONFIG_KEYS.plus([
    /**
     * Kubernetes only:
     * Allows to specify start command for container created with dockerImage parameter to overwrite Piper default (`/usr/bin/tail -f /dev/null`).
     */
    'containerCommand',
    /**
     * Map which defines per docker image the port mappings, e.g. `containerPortMappings: ['selenium/standalone-chrome': [[name: 'selPort', containerPort: 4444, hostPort: 4444]]]`.
     */
    'containerPortMappings',
    /**
     * Kubernetes only:
     * Allows to specify the shell to be used for execution of commands.
     */
    'containerShell',
    /**
     * Environment variables to set in the container, e.g. [http_proxy: 'proxy:8080'].
     */
    'dockerEnvVars',
    /**
     * Name of the docker image that should be used.
     * Configure with empty value to execute the command directly on the Jenkins system (not using a container).
     * Omit to use the default image (cf. [default_pipeline_environment.yml](https://github.com/SAP/jenkins-library/blob/master/resources/default_pipeline_environment.yml))
     * Overwrite to use custom Docker image.
     */
    'dockerImage',
    /**
     * Kubernetes only:
     * Name of the container launching `dockerImage`.
     * SideCar only:
     * Name of the container in local network.
     */
    'dockerName',
    /**
     * Docker only:
     * Docker options to be set when starting the container (List or String).
     */
    'dockerOptions',
    /**
     * Docker only:
     * Volumes that should be mounted into the container.
     */
    'dockerVolumeBind',
    /**
     * Set this to 'false' to bypass a docker image pull. Usefull during development process. Allows testing of images which are available in the local registry only.
     */
    'dockerPullImage',
    /**
     * Kubernetes only:
     * Specifies a dedicated user home directory for the container which will be passed as value for environment variable `HOME`.
     */
    'dockerWorkspace',
    /**
     * as `dockerEnvVars` for the sidecar container
     */
    'sidecarEnvVars',
    /**
     * as `dockerImage` for the sidecar container
     */
    'sidecarImage',
    /**
     * as `dockerName` for the sidecar container
     */
    'sidecarName',
    /**
     * as `dockerOptions` for the sidecar container
     */
    'sidecarOptions',
    /**
     * as `dockerVolumeBind` for the sidecar container
     */
    'sidecarVolumeBind',
    /**
     * Set this to 'false' to bypass a docker image pull. Usefull during development process. Allows testing of images which are available in the local registry only.
     */
    'sidecarPullImage',
    /**
     * as `dockerWorkspace` for the sidecar container
     */
    'sidecarWorkspace',
    /**
     * Command executed inside the container which returns exit code 0 when the container is ready to be used.
     */
    'sidecarReadyCommand',
    /**
     * Specific stashes that should be considered for the step execution.
     */
    'stashContent'
])
@Field Set PARAMETER_KEYS = STEP_CONFIG_KEYS.plus([
    /**
     * In the Kubernetes case the workspace is only available to the respective Jenkins slave but not to the containers running inside the pod.<br />
     * This flag controls whether the stashing does *not* use the default exclude patterns in addition to the patterns provided in `stashExcludes`.
     * @possibleValues `true`, `false`
     */
    'stashNoDefaultExcludes',
])

/**
 * Executes a closure inside a docker container with the specified docker image.
 * The workspace is mounted into the docker image.
 * Proxy environment variables defined on the Jenkins machine are also available in the Docker container.
 */
@GenerateDocumentation
void call(Map parameters = [:], body) {
    handlePipelineStepErrors(stepName: STEP_NAME, stepParameters: parameters, failOnError: true) {

        final script = checkScript(this, parameters) ?: this

        def utils = parameters?.juStabUtils ?: new Utils()

        Map config = ConfigurationHelper.newInstance(this)
            .loadStepDefaults()
            .mixinGeneralConfig(script.commonPipelineEnvironment, GENERAL_CONFIG_KEYS)
            .mixinStepConfig(script.commonPipelineEnvironment, STEP_CONFIG_KEYS)
            .mixinStageConfig(script.commonPipelineEnvironment, parameters.stageName ?: env.STAGE_NAME, STEP_CONFIG_KEYS)
            .mixin(parameters, PARAMETER_KEYS)
            .use()

        SidecarUtils sidecarUtils = new SidecarUtils(script)

        new Utils().pushToSWA([
            step: STEP_NAME,
            stepParamKey1: 'scriptMissing',
            stepParam1: parameters?.script == null,
            stepParamKey2: 'kubernetes',
            stepParam2: isKubernetes()
        ], config)

        if (isKubernetes() && config.dockerImage) {
            List dockerEnvVars = []
            config.dockerEnvVars?.each { key, value ->
                dockerEnvVars << "$key=$value"
            }
            if (env.POD_NAME && isContainerDefined(config)) {
                container(getContainerDefined(config)) {
                    withEnv(dockerEnvVars) {
                        echo "[INFO][${STEP_NAME}] Executing inside a Kubernetes Container."
                        body()
                        sh "chown -R 1000:1000 ."
                    }
                }
            } else {
                if (!config.dockerName) {
                    config.dockerName = UUID.randomUUID().toString()
                }
                if (!config.sidecarImage) {
                    dockerExecuteOnKubernetes(
                        script: script,
                        containerName: config.dockerName,
                        containerCommand: config.containerCommand,
                        containerShell: config.containerShell,
                        dockerImage: config.dockerImage,
                        dockerPullImage: config.dockerPullImage,
                        dockerEnvVars: config.dockerEnvVars,
                        dockerWorkspace: config.dockerWorkspace,
                        stashContent: config.stashContent,
                        stashNoDefaultExcludes: config.stashNoDefaultExcludes,
                    ){
                        echo "[INFO][${STEP_NAME}] Executing inside a Kubernetes Pod"
                        body()
                    }
                } else {
                    dockerExecuteOnKubernetes(
                        script: script,
                        containerName: config.dockerName,
                        containerCommand: config.containerCommand,
                        containerShell: config.containerShell,
                        dockerImage: config.dockerImage,
                        dockerPullImage: config.dockerPullImage,
                        dockerEnvVars: config.dockerEnvVars,
                        dockerWorkspace: config.dockerWorkspace,
                        stashContent: config.stashContent,
                        stashNoDefaultExcludes: config.stashNoDefaultExcludes,
                        containerPortMappings: config.containerPortMappings,
                        sidecarName: parameters.sidecarName,
                        sidecarImage: parameters.sidecarImage,
                        sidecarPullImage: parameters.sidecarPullImage,
                        sidecarReadyCommand: parameters.sidecarReadyCommand,
                        sidecarEnvVars: parameters.sidecarEnvVars
                    ) {
                        echo "[INFO][${STEP_NAME}] Executing inside a Kubernetes Pod"
                        body()
                    }
                }
            }
        } else {
            boolean executeInsideDocker = true
            if (!JenkinsUtils.isPluginActive(PLUGIN_ID_DOCKER_WORKFLOW)) {
                echo "[WARNING][${STEP_NAME}] Docker not supported. Plugin '${PLUGIN_ID_DOCKER_WORKFLOW}' is not installed or not active. Configured docker image '${config.dockerImage}' will not be used."
                executeInsideDocker = false
            }

            returnCode = sh script: 'docker ps -q > /dev/null', returnStatus: true
            if (returnCode != 0) {
                echo "[WARNING][$STEP_NAME] Cannot connect to docker daemon (command 'docker ps' did not return with '0'). Configured docker image '${config.dockerImage}' will not be used."
                executeInsideDocker = false
            }
            if (executeInsideDocker && config.dockerImage) {
                utils.unstashAll(config.stashContent)
                def image = docker.image(config.dockerImage)
                if (config.dockerPullImage) image.pull()
                else echo "[INFO][$STEP_NAME] Skipped pull of image '${config.dockerImage}'."
                if (!config.sidecarImage) {
                    image.inside(getDockerOptions(config.dockerEnvVars, config.dockerVolumeBind, config.dockerOptions)) {
                        body()
                    }
                } else {
                    def networkName = "sidecar-${UUID.randomUUID()}"
                    sh "docker network create ${networkName}"
                    try {
                        def sidecarImage = docker.image(config.sidecarImage)
                        if (config.sidecarPullImage) sidecarImage.pull()
                        else echo "[INFO][$STEP_NAME] Skipped pull of image '${config.sidecarImage}'."
                        config.sidecarOptions = config.sidecarOptions ?: []
                        if (config.sidecarName)
                            config.sidecarOptions.add("--network-alias ${config.sidecarName}")
                        config.sidecarOptions.add("--network ${networkName}")
                        sidecarImage.withRun(getDockerOptions(config.sidecarEnvVars, config.sidecarVolumeBind, config.sidecarOptions)) { container ->
                            config.dockerOptions = config.dockerOptions ?: []
                            if (config.dockerName)
                                config.dockerOptions.add("--network-alias ${config.dockerName}")
                            config.dockerOptions.add("--network ${networkName}")
                            if (config.sidecarReadyCommand) {
                                sidecarUtils.waitForSidecarReadyOnDocker(container.id, config.sidecarReadyCommand)
                            }
                            image.inside(getDockerOptions(config.dockerEnvVars, config.dockerVolumeBind, config.dockerOptions)) {
                                echo "[INFO][${STEP_NAME}] Running with sidecar container."
                                body()
                            }
                        }
                    } finally {
                        sh "docker network remove ${networkName}"
                    }
                }
            } else {
                echo "[INFO][${STEP_NAME}] Running on local environment."
                body()
            }
        }
    }
}

/*
 * Returns a string with docker options containing
 * environment variables (if set).
 * Possible to extend with further options.
 * @param dockerEnvVars Map with environment variables
 */

@NonCPS
private getDockerOptions(Map dockerEnvVars, Map dockerVolumeBind, def dockerOptions) {
    def specialEnvironments = [
        'http_proxy',
        'https_proxy',
        'no_proxy',
        'HTTP_PROXY',
        'HTTPS_PROXY',
        'NO_PROXY'
    ]
    def options = []
    if (dockerEnvVars) {
        dockerEnvVars.each { String k, v ->
            options.add("--env ${k}=${v.toString()}")
        }
    }

    specialEnvironments.each { String envVar ->
        if (dockerEnvVars == null || !dockerEnvVars.containsKey(envVar)) {
            options.add("--env ${envVar}")
        }
    }

    if (dockerVolumeBind) {
        dockerVolumeBind.each { String k, v ->
            options.add("--volume ${k}:${v.toString()}")
        }
    }

    if (dockerOptions) {
        if (dockerOptions instanceof CharSequence) {
            dockerOptions = [dockerOptions]
        }
        if (dockerOptions instanceof List) {
            dockerOptions.each { String option ->
                options << escapeBlanks(option)
            }
        } else {
            throw new IllegalArgumentException("Unexpected type for dockerOptions. Expected was either a list or a string. Actual type was: '${dockerOptions.getClass()}'")
        }
    }
    return options.join(' ')
}


boolean isContainerDefined(config) {
    Map containerMap = ContainerMap.instance.getMap()

    if (!containerMap.containsKey(env.POD_NAME)) {
        return false
    }

    return containerMap.get(env.POD_NAME).containsKey(config.dockerImage)
}


def getContainerDefined(config) {
    return ContainerMap.instance.getMap().get(env.POD_NAME).get(config.dockerImage).toLowerCase()
}


boolean isKubernetes() {
    return Boolean.valueOf(env.ON_K8S)
}

/*
 * Escapes blanks for values in key/value pairs
 * E.g. <code>description=Lorem ipsum</code> is
 * changed to <code>description=Lorem\ ipsum</code>.
 */

@NonCPS
def escapeBlanks(def s) {

    def EQ = '='
    def parts = s.split(EQ)

    if (parts.length == 2) {
        parts[1] = parts[1].replaceAll(' ', '\\\\ ')
        s = parts.join(EQ)
    }

    return s
}