#!/bin/bash

baseurl="https://search.maven.org"
response=""
status=""
downloaded=""

get_url(){
    response=$(curl -s --write-out "%{http_code}\n" "$1")
    status=${response: -3}
    response=${response:0:-3}
}

count_char_occurrences(){
    string=$1
    stripped=${string//[^$2]}
    return ${#stripped}
}

handle_dep(){
    package=$1

    count_char_occurrences "$package" :
    numcolon=$?

    if [[ $numcolon -eq 1 ]]; then
        group=${package%%:*}
        artifact=${package##*:}
        version=""
    elif [[ $numcolon -eq 2 ]]; then
        group=${package%%:*}
        version=${package##*:}
        tmp=${package#*:}
        artifact=${tmp%%:*}
    else
        echo "$package: Invalid format. It should be 'groupID:artifactID' or 'groupID:artifactID:version'"
        return
    fi

    if [[ $version =~ '$' ]]; then
        echo "$package: This script does not have support for pom variables yet. Using latest version instead"
        version=""
    fi


    if [[ -z $version ]]; then
        echo "$package: Finding latest version"
        url="$baseurl/solrsearch/select?q=g:$group+AND+a:$artifact&rows=1&wt=json"
        get_url "$url"
        if [[ $status -ne 200 ]]; then
            echo "$package: Error $status from the Maven API. Please check that the package name is correct."
            return
        fi

        version=$(echo "$response" | sed "s/^.*\"latestVersion\":\"\([^\"]*\)\".*$/\1/")
    fi

    if [[ $downloaded =~ "$group:$artifact:$version" ]]; then
        echo "$package: Already downloaded"
        return
    fi

    echo "$package: Downloading pom for version $version"
    grouppath=${group//.//}
    urlpath="$grouppath/$artifact/$version/$artifact-$version.pom"
    url="$baseurl/remotecontent?filepath=$urlpath"
    get_url "$url"
    if [[ "$status" -ne 200 ]]; then
        echo "$package: Error $status from the Maven API. There's probably a bug in the code."
        return
    fi

    if [[ $response =~ "<packaging>pom</packaging>" ]]; then
        echo "$package: Handling as a BOM"
        pom=${response//<dependencyManagement>/}
        pom=${pom//<\/dependencyManagement>/}
    else
        stripped=$(echo $response | grep -Po "<dependencyManagement>\s*<dependencies>\K.*(?= </dependencies>\s</dependencyManagement>)")
        stripped=$(echo $stripped | sed "s/<!--.*-->//g")
        deps=$(echo $stripped | sed "s/<dependency>\s*<groupId>\([^<]*\)<\/groupId>\s*<artifactId>\([^<]*\)<\/artifactId>\s*<version>\([^<]*\)<\/version>.*<\/dependency>/\1:\2:\3/g")

        pom=$(cat << DOC
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <groupId>tmp.$group</groupId>
    <artifactId>placeholder-$artifact</artifactId>
    <version>$version</version>
    <packaging>pom</packaging>
    <name>Package $artifact</name>
    <dependencies>
        <dependency>
            <groupId>$group</groupId>
            <artifactId>$artifact</artifactId>
            <version>$version</version>
        </dependency>
    </dependencies>
</project>
DOC
)
    fi

    destdir="$(pwd)/poms/$group:$artifact:$version"
    mkdir -p "$destdir"
    echo "$pom" > "$destdir/pom.xml"

    downloaded="$downloaded $group:$artifact:$version"

    for dep in $deps; do
        echo "$package: Downloading transitive dependency $dep"
        handle_dep $dep
    done
}

while read line; do
    handle_dep $line
done < "package-list.txt"

sh generate_master_pom.sh