#!/bin/bash
# Copyright (C) The Arvados Authors. All rights reserved.
#
# SPDX-License-Identifier: AGPL-3.0

set -e

fix=false
while [[ "${@}" != "" ]]
do
    arg=${1}
    shift
    case ${arg} in
        --help)
            cat <<EOF
Usage: $0 [--fix] [-- git-ls-args...]

Options:

--fix   Insert missing copyright notices where possible.

Git arguments:

Arguments after "--" are passed to \`git ls-files\`; this can be used to
restrict the set of files to check.

EOF
            exit 2
            ;;
        --fix)
            fix=true
            ;;
        --)
            break
            ;;
        *)
            echo >&2 "Unrecognized argument '${arg}'. Try $0 --help"
            exit 2
            ;;
    esac
done

fixer() {
    want="${want}" perl -pi~ - "${1}" <<'EOF'
BEGIN { undef $/ }
s{^((\#\!.*?\n|\n*---\n.*?\n\.\.\.\n|<\?xml.*?>\n)\n?)?}{${2}$ENV{want}\n\n}ms
EOF
}

IFS=$'\n' read -a ignores -r -d $'\000' <.licenseignore || true
result=0
git ls-files -z ${@} | \
    while read -rd $'\000' fnm
    do
        grepAfter=2
        grepBefore=0
        cs=
        cc=
        ce=
        fixer=
        if [[ ! -f ${fnm} ]] || [[ -L ${fnm} ]] || [[ ! -s ${fnm} ]]
        then
            continue
        fi

        ignore=
        for pattern in "${ignores[@]}"
        do
            if [[ ${fnm} == ${pattern} ]]
            then
                ignore=1
            fi
        done
        if [[ ${ignore} = 1 ]]; then continue; fi

        case ${fnm} in
            Makefile | */Makefile \
                | *.dockerfile | */Dockerfile.* | */Dockerfile | *.dockerignore \
                | */MANIFEST.in | */fuse.conf | */gitolite.rc \
                | *.pl | *.pm | *.PL \
                | *.rb | *.rb.example | *.rake | *.ru \
                | *.gemspec | */Gemfile | */Rakefile \
                | services/login-sync/bin/* \
                | sdk/cli/bin/* \
                | *.py \
                | sdk/python/bin/arv-* \
                | sdk/cwl/bin/* \
                | services/nodemanager/bin/* \
                | services/fuse/bin/* \
                | tools/crunchstat-summary/bin/* \
                | crunch_scripts/* \
                | *.yaml | *.yml | *.yml.example | *.cwl \
                | *.sh | *.service \
                | */run | */run-service | */restart-dns-server \
                | */nodemanager/doc/*.cfg \
                | */nodemanager/tests/fake*.cfg.template \
                | */nginx.conf \
                | build/build.list)
                fixer=fixer
                cc="#"
                ;;
            *.md)
                fixer=fixer
                cc="[//]: #"
                ;;
            *.rst)
                fixer=fixer
                cc=".."
                ;;
            *.erb)
                fixer=fixer
                cs="<%# "
                cc=""
                ce=" %>"
                ;;
            *.liquid)
                fixer=fixer
                cs=$'{% comment %}\n'
                cc=""
                ce=$'\n{% endcomment %}'
                grepAfter=3
                grepBefore=1
                ;;
            *.textile)
                fixer=fixer
                cs="###. "
                cc="...."
                ce=
                ;;
            *.css)
                fixer=fixer
                cs="/* "
                cc=""
                ce=" */"
                ;;
            *.coffee)
                fixer=fixer
                cs="### "
                cc=""
                ce=" ###"
                ;;
            *.go | *.scss | *.java | *.js)
                fixer=fixer
                cc="//"
                ;;
            *.sql)
                fixer=fixer
                cc="--"
                ;;
            *.html | *.svg)
                fixer=fixer
                cs="<!-- "
                cc=""
                ce=" -->"
                ;;
            *)
                cc="#"
                hashbang=$(head -n1 ${fnm})
                if [[ ${hashbang} = "#!/bin/sh" ]] ||  [[ ${hashbang} = "#!/bin/bash" ]]
                then
                    fixer=fixer
                fi
                ;;
        esac
        wantGPL="${cs:-${cc}${cc:+ }}Copyright (C) The Arvados Authors. All rights reserved.
${cc}
${cc}${cc:+ }SPDX-License-Identifier: AGPL-3.0${ce}"
        wantApache="${cs:-${cc}${cc:+ }}Copyright (C) The Arvados Authors. All rights reserved.
${cc}
${cc}${cc:+ }SPDX-License-Identifier: Apache-2.0${ce}"
        wantBYSA="${cs:-${cc}${cc:+ }}Copyright (C) The Arvados Authors. All rights reserved.
${cc}
${cc}${cc:+ }SPDX-License-Identifier: CC-BY-SA-3.0${ce}"
        found=$(head -n20 "$fnm" | egrep -A${grepAfter} -B${grepBefore} 'Copyright.*Arvados' || true)
        case ${fnm} in
            Makefile | build/* | lib/* | tools/* | apps/* | services/*)
                want=${wantGPL}
                ;;
            crunch_scripts/* | backports/* | docker/* | sdk/*)
                want=${wantApache}
                ;;
            README.md | doc/*)
                want=${wantBYSA}
                ;;
            *)
                want=
                ;;
        esac
        case "$found" in
            "$wantGPL")
                ;;
            "$wantApache")
                ;;
            "$wantBYSA")
                ;;
            "")
                if [[ -z ${found} ]] && [[ -n ${want} ]] && [[ $fix = true ]] && [[ $fixer != "" ]]
                then
                    ${fixer} ${fnm}
                else
                    echo "missing copyright notice: $fnm"
                    result=1
                fi
                ;;
            *)
                echo "nonstandard copyright notice: $fnm '${found}'"
                result=1
                ;;
        esac
    done
exit $result