#!/usr/bin/env bash
#
# chk_tree - verify that the source tree and git and Makefiles are in sync
#
# This tools is used by "make prep".
#
# Copyright (C) 2023 Landon Curt Noll
#
# Calc is open software; you can redistribute it and/or modify it under
# the terms of version 2.1 of the GNU Lesser General Public License
# as published by the Free Software Foundation.
#
# Calc is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
# Public License for more details.
#
# A copy of version 2.1 of the GNU Lesser General Public License is
# distributed with calc under the filename COPYING-LGPL.  You should have
# received a copy with calc; if not, write to Free Software Foundation, Inc.
# 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
#
# Under source code control:	2023/10/04 21:04:44
# File existed as early as:	2023
#
# chongo <was here> /\oo/\	http://www.isthe.com/chongo/
# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/

# setup
#
EXIT_CODE=0

# firewall - verify that the "make distdir" directories exist
#
make distdir >/dev/null 2>&1
status="$?"
if [[ $status -ne 0 ]]; then
    echo "$0: ERROR: make distdir exit code: $status" 1>&2
    EXIT_CODE=10
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# collect make distdir directory list
#
# We ignore make action lines.
#
declare -a DISTDIR
mapfile -t DISTDIR < <(make -s distdir | grep -v '^make\[[0-9]*\]: ' | sort -u)
if [[ ${#DISTDIR[@]} -le 0 ]]; then
    echo "$0: ERROR: distdir is empty" 1>&2
    EXIT_CODE=11
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# collect directories
#
# We ignore NOTES because it contains notes that are not part of calc source.
# We ignore .git and GitHub because they are not part of the calc source tarball.
#
declare -a FINDDIR
mapfile -t FINDDIR < <(find . -type d \
	! -path './NOTES/*' ! -name NOTES \
	! -path './.git/*' ! -name .git \
	! -path './.github/*' ! -name .github | \
	sed -e 's/^\.\///' | sort -u)
if [[ ${#FINDDIR[@]} -le 0 ]]; then
    echo "$0: ERROR: find dir is empty" 1>&2
    EXIT_CODE=12
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# compare DISTDIR and FINDDIR
#
declare -a DIFF_DISTDIR_FINDDIR
mapfile -t DIFF_DISTDIR_FINDDIR < <(printf '%s\n' "${DISTDIR[@]}" "${FINDDIR[@]}" |
				    tr ' ' '\n' | sort | uniq -u)
if [[ ${#DIFF_DISTDIR_FINDDIR[@]} -ne 0 ]]; then

    # report that DISTDIR and FINDDIR differ
    #
    echo "$0: ERROR: distdir and find dir differ for critical directories" 1>&2
    declare -a ONLY_FINDDIR
    mapfile -t ONLY_FINDDIR < <(printf '%s\n' "${DISTDIR[@]}" "${DISTDIR[@]}" "${FINDDIR[@]}" |
				tr ' ' '\n' | sort | uniq -u)
    if [[ ${#ONLY_FINDDIR[@]} -ne 0 ]]; then
	echo "$0: ERROR: found only in find dir: ${ONLY_FINDDIR[*]}" 1>&2
    fi
    declare -a ONLY_DISTDIR
    mapfile -t ONLY_DISTDIR < <(printf '%s\n' "${FINDDIR[@]}" "${FINDDIR[@]}" "${DISTDIR[@]}" |
				tr ' ' '\n' | sort | uniq -u)
    if [[ ${#ONLY_DISTDIR[@]} -ne 0 ]]; then
	echo "$0: ERROR: found only in distdir: ${ONLY_DISTDIR[*]}" 1>&2
    fi
    EXIT_CODE=13
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# firewall - verify that the "make distlist" files exist
#
make distlist >/dev/null 2>&1
status="$?"
if [[ $status -ne 0 ]]; then
    echo "$0: ERROR: make distlist exit code: $status" 1>&2
    EXIT_CODE=14
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# collect make distlist file list
#
declare -a DISTLIST
mapfile -t DISTLIST < <(make -s distlist | grep -v '^make\[[0-9]*\]: ' | sort -u)
if [[ ${#DISTLIST[@]} -le 0 ]]; then
    echo "$0: ERROR: distlist is empty" 1>&2
    EXIT_CODE=15
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi
declare -A DISTLIST_A
for i in "${DISTLIST[@]}"; do
    DISTLIST_A["$i"]="$i"
done

# case: under git control
#
if [[ -d .git ]]; then

    # obtain the list of files under git
    #
    # We ignore .git and GitHub related files because they are not part of the calc source tarball.
    #
    declare -a GITLS
    mapfile -t GITLS < <(git ls |
	grep -v -E '^\.github/|^\.gitignore$|^CODE_OF_CONDUCT\.md$|^CONTRIBUTING\.md$|^SECURITY\.md$' |
	sort -u)
    if [[ ${#GITLS[@]} -le 0 ]]; then
	echo "$0: ERROR: git ls is empty" 1>&2
	EXIT_CODE=16
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi

    # compare DISTLIST and GITLS
    #
    declare -a DIFF_DISTLIST_GITLS
    mapfile -t DIFF_DISTLIST_GITLS < <(printf '%s\n' "${DISTLIST[@]}" "${GITLS[@]}" |
				       tr ' ' '\n' | sort | uniq -u)
    if [[ ${#DIFF_DISTLIST_GITLS[@]} -ne 0 ]]; then

	# report that DISTLIST and GITLS differ
	#
	echo "$0: ERROR: distlist and git ls differ for critical files" 1>&2
	declare -a ONLY_GITLS
	mapfile -t ONLY_GITLS < <(printf '%s\n' "${DISTLIST[@]}" "${DISTLIST[@]}" "${GITLS[@]}" |
				  tr ' ' '\n' | sort | uniq -u)
	if [[ ${#ONLY_GITLS[@]} -ne 0 ]]; then
	    echo "$0: ERROR: found only in git ls: ${ONLY_GITLS[*]}" 1>&2
	fi
	declare -a ONLY_DISTLIST
	mapfile -t ONLY_DISTLIST < <(printf '%s\n' "${GITLS[@]}" "${GITLS[@]}" "${DISTLIST[@]}" |
				     tr ' ' '\n' | sort | uniq -u)
	if [[ ${#ONLY_DISTLIST[@]} -ne 0 ]]; then
	    echo "$0: ERROR: found only in distlist: ${ONLY_DISTLIST[*]}" 1>&2
	fi
	EXIT_CODE=17
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi

    # verify that there are no staged uncommitted changes under git
    #
    GIT_STATUS=$(git status --untracked-files=no --porcelain 2>&1)
    if [[ -n $GIT_STATUS ]] || ! git diff --cached --quiet --exit-code; then
	echo "$0: ERROR: there are staged uncommitted changes" 1>&2
	git status --short
	EXIT_CODE=18
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi

    # verify that there are no uncommitted changes under git
    #
    if ! git diff --quiet --exit-code; then
	echo "$0: ERROR: there are unstaged changes" 1>&2
	git status --untracked-files=no --porcelain --short
	EXIT_CODE=19
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi

    # verify that master branch is not ahead of 'origin/master'
    #
    GIT_MASTER=$(git rev-list --count master)
    GIT_ORIGIN_MASTER=$(git rev-list --count origin/master)
    if [[ $GIT_MASTER -gt $GIT_ORIGIN_MASTER ]]; then
	echo "$0: ERROR: master branch is behind of origin/master" 1>&2
	git status master
	EXIT_CODE=20
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    elif [[ $GIT_MASTER -lt $GIT_ORIGIN_MASTER ]]; then
	echo "$0: ERROR: master branch is ahead of origin/master" 1>&2
	git status master
	EXIT_CODE=21
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi

    # verify that branch is not ahead of 'origin/HEAD'
    #
    GIT_HEAD=$(git rev-list --count HEAD)
    GIT_ORIGIN_HEAD=$(git rev-list --count origin/HEAD)
    if [[ $GIT_HEAD -gt $GIT_ORIGIN_HEAD ]]; then
	echo "$0: ERROR: HEAD is behind of origin/HEAD" 1>&2
	git status HEAD
	EXIT_CODE=22
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    elif [[ $GIT_HEAD -lt $GIT_ORIGIN_HEAD ]]; then
	echo "$0: ERROR: HEAD is ahead of origin/HEAD" 1>&2
	git status HEAD
	EXIT_CODE=23
	echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
    fi
fi

# collect make buildlist file list
#
declare -a BUILDLIST
mapfile -t BUILDLIST < <(make -s buildlist | grep -v '^make\[[0-9]*\]: ' | sort -u)
if [[ ${#BUILDLIST[@]} -le 0 ]]; then
    echo "$0: ERROR: buildlist is empty" 1>&2
    EXIT_CODE=24
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi
declare -A BUILDLIST_A
for i in "${BUILDLIST[@]}"; do
    BUILDLIST_A["$i"]="$i"
done

# look for something in DISTLIST that is also in BUILDLIST
#
# The BUILDLIST are a set of files that are result of building calc
# and thus should NOT be part of the DISTLIST (list of files used
# to form the calc source distribtion).
#
declare -a DISTLIST_ALSO_IN_BUILDLIST
mapfile -t DISTLIST_ALSO_IN_BUILDLIST < <(
    for i in "${DISTLIST_A[@]}"; do
	if [[ -n "${BUILDLIST_A[$i]}" ]]; then
	    echo "$i";
	fi
    done
)
if [[ ${#DISTLIST_ALSO_IN_BUILDLIST[@]} -ne 0 ]]; then

    # report that something in DISTLIST was found in BUILDLIST
    #
    echo "$0: ERROR: distlist files found in buildlist" 1>&2
    echo "$0: ERROR: distlist files found in buildlist: ${DISTLIST_ALSO_IN_BUILDLIST[*]}" 1>&2
    EXIT_CODE=25
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# collect list of files
#
# We ignore NOTES because it contains notes that are not part of calc source.
# We ignore .git and GitHub because they are not part of the calc source tarball.
# We ignore .*.swp files as they are a result of vim sessions.
# We ignore *.out files as they are used to collect information.
# We ignore single letter files as they are used for temporary files.
#
declare -a FINDFILE
mapfile -t FINDFILE < <(find . -type f \
	! -path './NOTES/*' ! -name NOTES \
	! -path './.git/*' ! -name .git \
	! -path './.github/*' ! -name .github \
	! -name 'CODE_OF_CONDUCT.md' ! -name 'CONTRIBUTING.md' ! -name '.gitignore' ! -name 'SECURITY.md'  \
	! -name '*.swp' ! -name '*.out' ! -name '?' |
	sed -e 's/^\.\///' | sort -u)
if [[ ${#FINDFILE[@]} -le 0 ]]; then
    echo "$0: ERROR: find file is empty" 1>&2
    EXIT_CODE=26
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# look for something in FINDFILE that in neither DISTLIST nor BUILDLIST
#
# We look for a file that is neither a file that neither a result of building calc,
# nor part of the calc distribution list in a file list.
#
# NOTE that the file list has already excluded certain files (see previous section).
#
# We flag any file in the list that is neither a result of building calc,
# nor part of the calc distribution list in a file list.
#
declare -a UNKNOWN_FILE
mapfile -t UNKNOWN_FILE < <(
    for i in "${FINDFILE[@]}"; do

	# skip if this is a file that is result of building calc
	#
	if [[ -n ${BUILDLIST_A["$i"]} ]]; then
	    continue
	fi

	# skip if this is a file that is calc distribution list
	#
	if [[ -n ${DISTLIST_A["$i"]} ]]; then
	    continue
	fi

	# print the file of unknown status
	#
	echo "$i"
    done
)
if [[ ${#UNKNOWN_FILE[@]} -ne 0 ]]; then

    # report that something in DISTLIST was found in BUILDLIST
    #
    echo "$0: ERROR: files that are neither built nor distlist are found" 1>&2
    echo "$0: ERROR: distlist files found in buildlist: ${UNKNOWN_FILE[*]}" 1>&2
    EXIT_CODE=27
    echo "$0: Warning: set EXIT_CODE: $EXIT_CODE" 1>&2
fi

# All Done!!! -- Jessica Noll, Age 2
#
if [[ $EXIT_CODE -ne 0 ]]; then
    echo "$0: Warning: about to exit $EXIT_CODE" 1>&2
fi
exit "$EXIT_CODE"