#!/usr/bin/env sh

# shellcheck source=/dev/null
. "$(realpath "$(dirname "$0")")/shell_line_editor.sh"

replacement_file="$(mktemp)"

trap cleanup INT
trap "cleanup; remove_self" EXIT
cleanup() {
    rm "$replacement_file"
}
remove_self() {
    rm "$(realpath "$0")"
    rm "$(realpath "$(dirname "$0")")/shell_line_editor.sh"
}

# Prompt the user for a specific variable.
# ## Args:
# [1]: Name of the variable to populate the answer to
# [2]: An optional description
# [3]: An optionally suggested answer
# [4]: If this is set, the user is not even asked.
prompt() {
    pr_variable_upper="$(echo "$1" | sed 's/\([a-z]\)/\U\1/')"
    pr_description="$2"
    pr_suggested_answer="$3"
    pr_ask="$4"

    if [ -n "$pr_ask" ]; then
        REPLY="$pr_suggested_answer"
    else
        printf "\033[94;1mEnter %s\033[0m" "$pr_variable_upper"
        if [ -n "$pr_description" ]; then
            printf " (\033[93;1m%s\033[0m):\n" "$pr_description"
        else
            printf ":\n"
        fi

        # LE "> " 0 " " "$pr_suggested_answer" "yes_please_produce_debug_output"
        LE "> " 0 " " "$pr_suggested_answer" ""
    fi

    pr_new_variable="$(printf '%s="%s"' "$pr_variable_upper" "$REPLY")"

    eval "$pr_new_variable"
    printf "%s\n" "$pr_new_variable" >>"$replacement_file"
}

git init

# necessary meta data
prompt APPLICATION_NAME "The name of the application" "$(basename "$PWD")"
prompt APPLICATION_NAME_STYLIZED "The stylized name of the application (for documentation)" "$(echo "$APPLICATION_NAME" | sed 's/\([a-z]*\)/\u\1/')"
prompt APPLICATION_NAME_CAPITALIZED_MAN_PART "The capitalized name of the application (for documentation also with a man section part)" "$(echo "$APPLICATION_NAME" | sed 's/\([a-z]*\)/\U\1(1)/')" "dont_ask"
prompt APPLICATION_VERSION "The version of this program, without the prefix" "0.1.0"

prompt AUTHOR_NAME "The name of the author (or authors)" "$(git config --get user.name)"
prompt AUTHOR_EMAIL "The email of the author (or authors)" "$(git config --get user.email)"

# cog change-log variables
prompt REMOTE "The remote, this project will be pushed to" "git.vhack.eu"
prompt REPOSITORY "The name of the repository in the remote" "$APPLICATION_NAME"
prompt OWNER "The name of owner of the repository" "$AUTHOR_NAME"

# nice meta data
prompt DESCRIPTION "The description of this project" "[can be empty]"
prompt CURRENT_DATE "The stylized version of the current date" "$(date +'%b %Y')"
prompt YEAR "The year the work on this has begun (for copyright reasons)" "$(date +'%Y')"
prompt APPLICATION_SOURCE_CODE_REPOSITORY "The package's source code repository URL" "https://$REMOTE/$OWNER/$REPOSITORY"

# LICENSE.spdx data (source: https://github.com/david-a-wheeler/spdx-tutorial)
if [ -e ./lpm.toml ]; then
    # Use a different default license in latex projects.
    init_default_license="CC-BY-SA-4.0"
else
    init_default_license="GPL-3.0-or-later"
fi
prompt SPDX_LICENSE_IDENTIFIER "THE SPDX identifer of your choosen license" "$init_default_license"
prompt APPLICATION_ORIGINATOR "The person or organization from whom the package originally came" "$AUTHOR_NAME"
prompt APPLICATION_HOME_PAGE "The package's home page URL" "https://$REMOTE/$OWNER/$REPOSITORY"

echo "Downloading license .."
case "$SPDX_LICENSE_IDENTIFIER" in
"AGPL-3.0-or-later")
    default_license_url="https://www.gnu.org/licenses/agpl-3.0.txt"
    curl "$default_license_url" >COPYING
    ;;
"GPL-3.0-or-later")
    default_license_url="https://www.gnu.org/licenses/gpl-3.0.txt"
    curl "$default_license_url" >COPYING
    ;;
"LGPL-3.0-or-later")
    default_license_url="https://www.gnu.org/licenses/lgpl+gpl-3.0.txt"
    curl "https://www.gnu.org/licenses/gpl-3.0.txt" >COPYING
    curl "https://www.gnu.org/licenses/lgpl-3.0-standalone.html" >COPYING.LESSER
    ;;

"Apache-2.0")
    default_license_url="https://www.apache.org/licenses/LICENSE-2.0.txt"
    curl "$default_license_url" >LICENSE
    ;;

"CC-BY-SA-4.0")
    default_license_url="https://creativecommons.org/licenses/by-sa/4.0/legalcode.txt"
    curl "$default_license_url" >LICENSE
    ;;

*)
    default_license_url="file:///dev/null"
    echo "    -> No license found for your identifier: '$SPDX_LICENSE_IDENTIFIER'"
    ;;
esac

prompt LICENSE_URL "The url of the license" "$default_license_url" "dont_ask"

echo "$DESCRIPTION" >.git/description

while read -r var; do
    var_name="${var%=*}"
    var_value="${var#*=\"}"
    var_value="${var_value%\"}"

    fd . --hidden --type file --exec sed --in-place "s|%\bINIT_$var_name\b|$var_value|g"

    # Replace the variable in file paths
    fd "%INIT_$var_name" . --hidden | while read -r file_path; do
        new_file_path="$(echo "$file_path" | sed "s|%INIT_$var_name|$var_value|g")"
        mv "$file_path" "$new_file_path"
    done
done <"$replacement_file"

# HACK: Re-add the executable permissions to files, which the nix template has somehow
# removed <2024-04-02>
chmod +x scripts/*
chmod +x update.sh
[ -f ./build.sh ] && chmod +x build.sh

# vim: ft=sh