#!/usr/bin/env bash

# Script variables
PYTHON_MAJOR=3
PYTHON_MINOR=7
ACCEPTABLE_PYTHON_COMMANDS="python3 python3.10 python3.9 python3.8 python3.7 python"

SCRIPT_SOURCE_DIR=$(dirname -- "${BASH_SOURCE[0]}")

while read -r requirement
do
    REQUIRED_PIP_MODULES="$REQUIRED_PIP_MODULES $(sed -r "s/:.*//g" <<< $requirement)"
    REQUIRED_PYTHON_MODULES="$REQUIRED_PYTHON_MODULES $(sed -r "s/.*://g" <<< $requirement)"
done < $SCRIPT_SOURCE_DIR/requirements.txt

# Plumbing
set -o pipefail

RESTORE=$(echo -en '\033[0m')
STANDOUT=$(echo -en '\033[7m')
RED=$(echo -en '\033[00;31m')
GREEN=$(echo -en '\033[00;32m')
YELLOW=$(echo -en '\033[00;33m')
PURPLE=$(echo -en '\033[00;35m')
LIGHTGRAY=$(echo -en '\033[00;37m')
LRED=$(echo -en '\033[01;31m')
LGREEN=$(echo -en '\033[01;32m')
LYELLOW=$(echo -en '\033[01;33m')
LBLUE=$(echo -en '\033[01;34m')
LCYAN=$(echo -en '\033[01;36m')



function usage {
    echo "Usage: $0 <prod|test>"
    exit 0
}

if [ "$EUID" -ne 0 ]; then
    echo "error: must run as root"
    usage
fi

# Handle argument input
case $1 in
    h|help|?|-h|-help|-?|--h|--help|--?)
        usage
        ;;
    prod)
        ;;
    test)
        ;;
    *)
        usage
        ;;
esac

MODE=$1
PYTHON_COMMAND=

# Determine Python interpreter to use
echo "${LIGHTGRAY}Determining Python interpreter${RESTORE}"
if [ -z $PYTHON_COMMAND ]; then
    for COMMAND in $ACCEPTABLE_PYTHON_COMMANDS
    do
        if command -v $COMMAND &> /dev/null; then
            PYTHON_COMMAND=$COMMAND
            break
        fi
    done
fi

# Expand interpreter command, verify with `import sys` test instruction
PYTHON_COMMAND=$(command -v $PYTHON_COMMAND)
if [ -z $PYTHON_COMMAND ]; then
    echo "  ${RED}Python interpreter not found${RESTORE}"
    exit 1
fi
if [ -h "$PYTHON_COMMAND" ]; then
    PYTHON_COMMAND=$(readlink -f $PYTHON_COMMAND)
fi
echo "  Trying interpreter [ ${LYELLOW}$PYTHON_COMMAND${RESTORE} ]"
if ! $PYTHON_COMMAND -c "import sys"; then
    echo "  ${RED}Executable is not Python${RESTORE}"
    exit 1
fi

# Verifying Python version
echo "${LIGHTGRAY}Checking Python version${RESTORE} [ needs ${LIGHTGRAY}>=$PYTHON_MAJOR.$PYTHON_MINOR${RESTORE} ]"
PYTHON_VERSION_STRING=$($PYTHON_COMMAND -c "print('.'.join([str(a) for a in __import__('sys').version_info[:3]]))")
if ! $PYTHON_COMMAND -c "import sys;exit(not(sys.version_info.major==$PYTHON_MAJOR and sys.version_info.minor>=$PYTHON_MINOR))"; then
    echo "  ${RED}Python version must be ${RESTORE}[ ${LCYAN}>=$PYTHON_MAJOR.$PYTHON_MINOR${RESTORE} ]${RED}."\
                 "Installed is ${RESTORE}[ ${LCYAN}$PYTHON_VERSION_STRING${RESTORE} ]"
    exit 1
fi
echo "  Version [ ${LCYAN}$PYTHON_VERSION_STRING${RESTORE} ] acceptable"

# Verifying required modules are installed
echo "${LIGHTGRAY}Checking Python modules installed${RESTORE}"
for MODULE in $(seq 1 $(wc -w <<< $REQUIRED_PIP_MODULES))
do
    PIP_MODULE=$(awk -v N=$MODULE '{print $N}' <<< "$REQUIRED_PIP_MODULES")
    PYTHON_MODULE=$(awk -v N=$MODULE '{print $N}' <<< "$REQUIRED_PYTHON_MODULES")
    if ! $PYTHON_COMMAND -c "import $PYTHON_MODULE" &> /dev/null; then
        echo "  ${RED}Required Python module ${RESTORE}[ ${LBLUE}$PYTHON_MODULE${RESTORE} ] ${RED}not found${RESTORE}"
        echo "  Install with ${PURPLE}$PYTHON_COMMAND -m pip install $PIP_MODULE${RESTORE}"
        exit 1
    fi
    echo "  Module [ ${LBLUE}$PYTHON_MODULE${RESTORE} ] found"
done
echo "  ${GREEN}All required modules found${RESTORE}"

function runcmd {
    "$@" 2>&1 | sed 's/^/  /';
}


echo "${LIGHTGRAY}Running HTML templating script${RESTORE}"
runcmd $SCRIPT_SOURCE_DIR/root/compile.py $HTML_OUT
if [ $? != 0 ]; then
    echo "  ${RED}Error running templating script${RESTORE}"
else
    echo "  ${GREEN}Templating successful${RESTORE}"
fi

echo "${LIGHTGRAY}Installing nginx configuration${RESTORE}"

if [ ! -f $SCRIPT_SOURCE_DIR/nginx/nginx.conf ]; then
    echo "  ${RED}Core configuration file ${RESTORE}[ ${LBLUE}$SCRIPT_SOURCE_DIR/nginx/nginx.conf${RESTORE} ] ${RED}not found${RESTORE}"
    exit 1
fi
runcmd cp -v $SCRIPT_SOURCE_DIR/nginx/nginx.conf /etc/nginx/nginx.conf

runcmd rm -rv /etc/nginx/sites/joshstock.in
runcmd mkdir -p /etc/nginx/sites/joshstock.in
if [ ! -d $SCRIPT_SOURCE_DIR/nginx/$MODE ]; then
    echo "  ${RED}Directory ${RESTORE}[ ${LBLUE}$SCRIPT_SOURCE_DIR/nginx/$MODE${RESTORE} ] ${RED}not found${RESTORE}"
    exit 1
fi
runcmd cp -rv $SCRIPT_SOURCE_DIR/nginx/$MODE/* /etc/nginx/sites/joshstock.in
echo "  ${GREEN}nginx configuration successfully installed${RESTORE}"

echo "${LIGHTGRAY}Installing resty-gitweb configuration${RESTORE}"
runcmd cp -v $SCRIPT_SOURCE_DIR/resty-gitweb.yaml /etc/resty-gitweb.yaml
echo "  ${GREEN}resty-gitweb configuration successfully installed${RESTORE}"

if [[ ! $(lsof -i TCP:80) =~ "nginx" ]]; then
    echo "${LIGHTGRAY}(Re)starting nginx${RESTORE}"
    systemctl restart nginx
else
    echo "${LIGHTGRAY}Reloading nginx${RESTORE}"
    systemctl reload nginx
fi
if [ $? != 0 ]; then
    echo "  ${RED}nginx configuration not accepted${RESTORE}"
    runcmd systemctl status nginx
    exit 1
else
    echo "  ${GREEN}nginx loaded new configuration successfully${RESTORE}"
    echo "${BOLD}${LGREEN}Successful deployment!${RESTORE}"
    exit 0
fi