import java.util.regex.Matcher

/*
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing,
 software distributed under the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 */

allConditionsMet = true

baseDirectory = project.model.pomFile.parent

/*
 Checks if a given version number is at least as high as a given reference version.
*/

def checkVersionAtLeast(String current, String minimum) {
    def currentSegments = current.tokenize('.')
    def minimumSegments = minimum.tokenize('.')
    def numSegments = Math.min(currentSegments.size(), minimumSegments.size())
    for (int i = 0; i < numSegments; ++i) {
        def currentSegment = currentSegments[i].toInteger()
        def minimumSegment = minimumSegments[i].toInteger()
        if (currentSegment < minimumSegment) {
            println current.padRight(14) + " FAILED (required min " + minimum + " but got " + current + ")"
            return false
        } else if (currentSegment > minimumSegment) {
            println current.padRight(14) + " OK"
            return true
        }
    }
    def curNotShorter = currentSegments.size() >= minimumSegments.size()
    if (curNotShorter) {
        println current.padRight(14) + " OK"
    } else {
        println current.padRight(14) + " (required min " + minimum + " but got " + current + ")"
    }
    curNotShorter
}

def checkVersionAtMost(String current, String maximum) {
    def currentSegments = current.tokenize('.')
    def maximumSegments = maximum.tokenize('.')
    def numSegments = Math.min(currentSegments.size(), maximumSegments.size())
    for (int i = 0; i < numSegments; ++i) {
        def currentSegment = currentSegments[i].toInteger()
        def maximumSegment = maximumSegments[i].toInteger()
        if (currentSegment > maximumSegment) {
            println current.padRight(14) + " FAILED (required max " + maximum + " but got " + current + ")"
            return false
        } else if (currentSegment < maximumSegment) {
            println current.padRight(14) + " OK"
            return true
        }
    }
    def curNotShorter = currentSegments.size() >= maximumSegments.size()
    if (curNotShorter) {
        println current.padRight(14) + " OK"
    } else {
        println current.padRight(14) + " (required max " + maximum + " but got " + current + ")"
    }
    curNotShorter
}

def checkBison() {
    print "Detecting Bison version:   "
    def output
    try {
        output = "bison --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "2.4.0")
        if (!result) {
            allConditionsMet = false
        }

        // TODO: Ensure the path of the `bison` binary doesn't contain any spaces.
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkDotnet() {
    print "Detecting Dotnet version:  "
    def output
    try {
        output = "dotnet --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "2.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}


def checkJavaVersion(String minVersion, String maxVersion) {
    print "Detecting Java version:    "
    def curVersion = System.properties['java.version']
    def result
    if (minVersion != null) {
        result = checkVersionAtLeast(curVersion, minVersion)
        if (!result) {
            allConditionsMet = false
            return
        }
    }
    if (maxVersion != null) {
        result = checkVersionAtMost(curVersion, maxVersion)
        if (!result) {
            allConditionsMet = false
            return
        }
    }
}

def checkMavenVersion(String minVersion, String maxVersion) {
    print "Detecting Maven version:   "
    def curVersion = project.projectBuilderConfiguration.systemProperties['maven.version']
    def result
    if (minVersion != null) {
        result = checkVersionAtLeast(curVersion, minVersion)
        if (!result) {
            allConditionsMet = false
            return
        }
    }
    if (maxVersion != null) {
        result = checkVersionAtMost(curVersion, maxVersion)
        if (!result) {
            allConditionsMet = false
            return
        }
    }
}

def checkFlex() {
    print "Detecting Flex version:    "
    def output
    try {
        output = "flex --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "2.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkGcc() {
    print "Detecting Gcc version:     "
    def output
    try {
        output = "gcc --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "1.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkGit() {
    print "Detecting Git version:     "
    def output
    try {
        output = "git --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "1.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkGpp() {
    print "Detecting G++ version:     "
    def output
    try {
        output = "g++ --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "1.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkClang() {
    print "Detecting clang version:   "
    def output
    try {
        output = "clang --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "1.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

def checkCmake() {
    print "Detecting cmake version:   "
    def output
    try {
        output = "cmake --version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "3.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}


def checkPython() {
    print "Detecting Python version:  "
    try {
        def process = ("python --version").execute()
        def stdOut = new StringBuilder()
        def stdErr = new StringBuilder()
        process.consumeProcessOutput(stdOut, stdErr)
        process.waitForOrKill(500)
        Matcher matcher = extractVersion(stdOut + stdErr)
        if (matcher.size() > 0) {
            def curVersion = matcher[0][1]
            def result = checkVersionAtLeast(curVersion, "2.7.0")
            if (!result) {
                allConditionsMet = false
            }
        } else {
            println "missing"
            allConditionsMet = false
        }
    } catch (Exception e) {
        println "missing"
        allConditionsMet = false
    }
}

/*
 * This check does an extremely simple check, if the boost library exists in the maven local repo.
 * We're not checking if it could be resolved.
 */

def checkBoost() {
    print "Detecting Boost library:   "
    def localRepoBaseDir = session.getLocalRepository().getBasedir()
    def expectedFile = new File(localRepoBaseDir, "org/apache/plc4x/plc4x-tools-boost/" + project.version +
        "/plc4x-tools-boost-" + project.version + "-lib-" + project.properties["os.classifier"] + ".zip")
    if (!expectedFile.exists()) {
        println "              missing"
        println ""
        println "Missing the Boost library. This has to be built by activating the Maven profile 'with-boost'. This only has to be built once."
        println ""
        allConditionsMet = false
    } else {
        println "              OK"
    }
}

def checkOpenSSL() {
    print "Detecting OpenSSL version: "
    def output
    try {
        output = "openssl version".execute().text
    } catch (IOException e) {
        output = ""
    }
    Matcher matcher = extractVersion(output)
    if (matcher.size() > 0) {
        def curVersion = matcher[0][1]
        def result = checkVersionAtLeast(curVersion, "1.0.0")
        if (!result) {
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
}

// When building the StreamPipes modules we need Docker.
// Not only should the docker executable be available, but also should the docker daemon be running.
def checkDocker() {
    print "Detecting Docker version:  "
    def output
    try {
        output = "docker info".execute().text
    } catch (IOException e) {
        output = ""
    }
    // Check if Docker is installed at all
    def matcher1 = output =~ /Server:/
    if (matcher1.size() > 0) {
        // If it is check if the daemon is running and if the version is ok
        def matcher2 = output =~ /Server Version: (\d+\.\d+(\.\d+)?).*/
        if (matcher2.size() > 0) {
            def curVersion = matcher2[0][1]
            def result = checkVersionAtLeast(curVersion, "1.0.0")
            if (!result) {
                allConditionsMet = false
            }
        } else {
            println "Docker daemon probably not running"
            allConditionsMet = false
        }
    } else {
        println "missing"
        allConditionsMet = false
    }
    // TODO: Implement the actual check ...
}

/**
 * Version extraction function/macro. It looks for occurrence of x.y or x.y.z
 * in passed input text (likely output from `program --version` command if found).
 *
 * @param input
 * @return
 */
private Matcher extractVersion(input) {
    def matcher = input =~ /(\d+\.\d+(\.\d+)?).*/
    matcher
}

/////////////////////////////////////////////////////
// Find out which OS and arch are bring used.
/////////////////////////////////////////////////////

def osString = project.properties['os.classifier']
def osMatcher = osString =~ /(.*)-(.*)/
if (osMatcher.size() == 0) {
    throw new RuntimeException("Currently unsupported OS")
}
def os = osMatcher[0][1]
def arch = osMatcher[0][2]
println "Detected OS:   " + os
println "Detected Arch: " + arch

/////////////////////////////////////////////////////
// Find out which profiles are enabled.
/////////////////////////////////////////////////////

println "Enabled profiles:"
def boostEnabled = false
def cEnabled = false
def cppEnabled = false
def dockerEnabled = false
def dotnetEnabled = false
def javaEnabled = true
def logstashEnabled = false
def pythonEnabled = false
def sandboxEnabled = false
def apacheReleaseEnabled = false
def activeProfiles = session.request.activeProfiles
for (def activeProfile : activeProfiles) {
    if (activeProfile == "with-boost") {
        boostEnabled = true
        println "boost"
    } else if (activeProfile == "with-c") {
        cEnabled = true
        println "c"
    } else if (activeProfile == "with-cpp") {
        cppEnabled = true
        println "cpp"
    } else if (activeProfile == "with-docker") {
        dockerEnabled = true
        println "docker"
    } else if (activeProfile == "with-dotnet") {
        dotnetEnabled = true
        println "dotnet"
    } else if (activeProfile == "with-logstash") {
        logstashEnabled = true
        println "logstash"
    } else if (activeProfile == "with-python") {
        pythonEnabled = true
        println "python"
    } else if (activeProfile == "with-sandbox") {
        sandboxEnabled = true
        println "sandbox"
    } else if (activeProfile == "apache-release") {
        apacheReleaseEnabled = true
        println "apache-release"
    }
}
println ""

// - Windows:
//     - Check the length of the path of the base dir as we're having issues with the length of paths being too long.
if (os == "win") {
    File pomFile = project.model.pomFile
    if (pomFile.absolutePath.length() > 100) {
        println "On Windows we encounter problems with maximum path lengths. " +
            "Please move the project to a place it has a shorter base path " +
            "and run the build again."
        allConditionsMet = false;
    }
}

/////////////////////////////////////////////////////
// Do the actual checks depending on the enabled
// profiles.
/////////////////////////////////////////////////////

if (dotnetEnabled) {
    checkDotnet()
}

if (logstashEnabled) {
    // Logstash doesn't compile with java versions above 11 (currently)
    checkJavaVersion(null, "11")
}

if (cppEnabled) {
    checkClang()
    // The cmake-maven-plugin requires at least java 11
    checkJavaVersion("11", null)
    checkGcc()
}

if (javaEnabled) {
    checkGit()
}

if (cEnabled) {
    // The cmake-maven-plugin requires at least java 11
    checkJavaVersion("11", null)
    checkGcc()
}

if (cppEnabled) {
    checkGpp()
}

if (pythonEnabled) {
    checkPython()
}

// Boost needs the visual-studio `cl` compiler to compile the boostrap.
if (boostEnabled && (os == "win")) {
    // TODO: checkVisualStudio()
}

// We only need this check, if boost is not enabled but we're enabling cpp.
if (!boostEnabled && cppEnabled) {
    checkBoost()
}

if (sandboxEnabled && dockerEnabled) {
    checkDocker()
}

if (cppEnabled || cEnabled) {
    // CMake requires at least maven 3.6.0
    checkMavenVersion("3.6.0", null)
}

if (apacheReleaseEnabled) {
    // TODO: Check libpcap is installed
}

if (cppEnabled && (os == "win")) {
    print "Unfortunately currently we don't support building the 'with-cpp' profile on windows. This will definitely change in the future."
    allConditionsMet = false
}

if (!allConditionsMet) {
    throw new RuntimeException("Not all conditions met, see log for details.")
}
println ""
println "All known conditions met successfully."
println ""

// Things we could possibly check:
// - DNS Providers that return a default ip on unknown host-names
// - Availability and version of LibPCAP/WinPCAP