#!/usr/bin/env bash

# global variables

# functions

function bashrc_count_lines {
    wc -l "$HOME/.bashrc" | cut -d' ' -f1
}

function bashrc_watch_start {
    if [[ -z "${BASHRC_LINES+set}" ]]; then
        BASHRC_LINES=$(bashrc_count_lines)
    else
        BASHRC_EVOLVED=true
    fi
}

function bashrc_watch_end {
    bashrc_lines=$(bashrc_count_lines)
    if [[ "$BASHRC_LINES" -lt "$bashrc_lines" || -n "${BASHRC_EVOLVED+set}" ]]; then
        echo
        echo '*****************************'
        echo '* BASHRC has evolved!       *'
        echo '* please synchronize:       *'
        echo '*                           *'
        echo "*   source ~/.bashrc        *"
        echo '*                           *'
        echo '*****************************'
        echo
    fi
}

function _bashrc_env_with_prefix {
    arg1="$1"
    arg2="$2"
    prefix="$3"
    if printenv | grep -q "$arg1"; then
        real_value=$(eval "echo \$$arg1")
        echo "success for $arg1 = $real_value"
    else
        case "$prefix" in
        export)
            session_line="export ${arg1}=${arg2}"
            regex="$session_line"
            ;;
        eval)
            session_line="eval \"\$($arg2)\""
            regex="eval \"\\\$\\($arg2\\)\""
            ;;
        *) echo "unknown prefix $prefix" && exit 10 ;;
        esac
        append_or_replace "$regex" "$session_line" "$HOME/.bashrc" &>/dev/null
        eval "$session_line"
        set +e
        eval "BASHRC_LINES=$BASHRC_LINES $0"
        exit $?
    fi

}

function bashrc_env_export {
    _bashrc_env_with_prefix "$1" "$2" 'export'
}

function bashrc_env_eval {
    _bashrc_env_with_prefix "$1" "$2" 'eval'
}

# main

set -Eeu
bashrc_watch_start

echo 'init'
bashrc_env_export 'SESSION_RESTART' true
bashrc_env_export 'TOTO' fluo
bashrc_env_eval 'MISE_SHELL' "$HOME/.local/bin/mise activate bash"
echo 'end'

bashrc_watch_end