#!/usr/bin/env bash

#
# This script takes a maven-inputs.txt file and builds a Nix expression that can be used by maven-repo-builder.nix to produce a path to a local Maven repository
#

function getSHA() {
  nix-prefetch-url --type sha256 "$1" 2> /dev/null
}

_tmp=$(mktemp)
sort $1 | uniq > $_tmp
trap "rm $_tmp" EXIT INT

apacheUrl='https://repo.maven.apache.org/maven2'
clojarsUrl='https://repo.clojars.org'
fabricUrl='https://maven.fabric.io/public'
googleUrl='https://dl.google.com/dl/android/maven2'
gradleUrl='http://repo.gradle.org/gradle/libs-releases-local'
gradlePluginsUrl='https://plugins.gradle.org/m2'
javaUrl='https://maven.java.net/content/repositories/releases'
jcenterUrl='https://jcenter.bintray.com'
jitpackUrl='https://jitpack.io'
mavenUrl='https://repo1.maven.org/maven2'
sonatypeSnapshotsUrl='https://oss.sonatype.org/content/repositories/snapshots'
sonatypePublicGridUrl='https://repository.sonatype.org/content/groups/sonatype-public-grid'

# Writes Nix attribute set describing a package (represented by its URL)
function writeEntry() {
  local depurl=$1
  if [[ "$depurl" = "$apacheUrl"* ]]; then
    host='apache'
    prefix=$apacheUrl
  elif [[ "$depurl" = "$clojarsUrl"* ]]; then
    host='clojars'
    prefix=$clojarsUrl
  elif [[ "$depurl" = "$fabricUrl"* ]]; then
    host='fabric-io'
    prefix=$fabricUrl
  elif [[ "$depurl" = "$googleUrl"* ]]; then
    host='google'
    prefix=$googleUrl
  elif [[ "$depurl" = "$gradleUrl"* ]]; then
    host='gradle'
    prefix=$gradleUrl
  elif [[ "$depurl" = "$gradlePluginsUrl"* ]]; then
    host='gradlePlugins'
    prefix=$gradlePluginsUrl
  elif [[ "$depurl" = "$jcenterUrl"* ]]; then
    host='jcenter'
    prefix=$jcenterUrl
  elif [[ "$depurl" = "$jitpackUrl"* ]]; then
    host='jitpack'
    prefix=$jitpackUrl
  elif [[ "$depurl" = "$javaUrl"* ]]; then
    host='java'
    prefix=$javaUrl
  elif [[ "$depurl" = "$mavenUrl"* ]]; then
    host='maven'
    prefix=$mavenUrl
  elif [[ "$depurl" = "$sonatypeSnapshotsUrl"* ]]; then
    host='sonatypeSnapshots'
    prefix=$sonatypeSnapshotsUrl
  elif [[ "$depurl" = "$sonatypePublicGridUrl"* ]]; then
    host='sonatypePublicGrid'
    prefix=$sonatypePublicGridUrl
  else
    echo "Unknown host in $depurl, exiting."
    exit 1
  fi
  deppath="${depurl/$prefix\//}"
  pom_sha256=$(getSHA "$depurl.pom")
  [ -n "$pom_sha256" ] && pom_sha1=$(curl -s --location "$depurl.pom.sha1") || unset pom_sha1
  jar_sha256=$(getSHA "$depurl.jar")
  type='jar'
  if [ -z "$jar_sha256" ]; then
    jar_sha256=$(getSHA "$depurl.aar")
    [ -n "$jar_sha256" ] && type='aar'
  fi
  [ -n "$jar_sha256" ] && jar_sha1=$(curl -s --location "$depurl.${type}.sha1") || unset jar_sha1

  if [ -z "$pom_sha256" ] && [ -z "$jar_sha256" ] && [ -z "$aar_sha256" ]; then
    echo "Warning: failed to download $depurl" > /dev/stderr
    echo "Exiting." > /dev/stderr
    exit 1
  fi

  echo -n "  \"$depurl\" =
  {
    host = repositories.$host;
    path =
      \"$deppath\";
    type = \"$type\";"
    if [ -n "$pom_sha256" ]; then
      echo -n "
    pom = {
      sha1 = \"$pom_sha1\";
      sha256 = \"$pom_sha256\";
    };"
    fi
    if [ -n "$jar_sha256" ]; then
      echo -n "
    jar = {
      sha1 = \"$jar_sha1\";
      sha256 = \"$jar_sha256\";
    };"
    fi
    echo "
  };"
}

lineCount=$(wc -l $1 | cut -f 1 -d ' ')
currentLine=0
pstr="[=======================================================================]"

echo "# Auto-generated by $(realpath --relative-to="$(dirname $1)" ${BASH_SOURCE})
{ }:

let
  repositories = {
    apache = \"$mavenUrl\";
    clojars = \"$clojarsUrl\";
    fabric-io = \"$fabricUrl\";
    google = \"$googleUrl\";
    gradle = \"$gradleUrl\";
    gradlePlugins = \"$gradlePluginsUrl\";
    java = \"$javaUrl\";
    jcenter = \"$jcenterUrl\";
    jitpack = \"$jitpackUrl\";
    maven = \"$mavenUrl\";
    sonatypeSnapshots =
      \"$sonatypeSnapshotsUrl\";
    sonatypePublicGrid =
      \"$sonatypePublicGridUrl\";
  };

in {"
echo "Generating Nix file from $1..." > /dev/stderr
while read depurl
do
  currentLine=$(( $currentLine + 1 ))
  pd=$(( $currentLine * 73 / $lineCount ))
  printf "\r%3d.%1d%% %.${pd}s" $(( $currentLine * 100 / $lineCount )) $(( ($currentLine * 1000 / $lineCount) % 10 )) $pstr > /dev/stderr

  if [ -z "$depurl" ]; then
    continue
  fi
  writeEntry $depurl

  # com.android.tools.build:aapt2 package also includes a platform-specific package, so we should add that too
  if [[ "$depurl" = *'com/android/tools/build/aapt2/'* ]]; then
    writeEntry "$depurl-linux"
    writeEntry "$depurl-osx"
  fi
done < $_tmp

echo "}"