#!/usr/bin/env bash
# USAGE: ./setup.sh             install cbuild to /usr/local
#        ./setup.sh --local     install cbuild to $HOME/.local

# exit on errors
set -xeo pipefail
CBUILD_VERSION=2.1.1

function version_parse {
    local value="$1"
    var_name="$2"
    IFS_backup="$IFS"
    IFS='.'
    local v_array=($value)
    IFS="$IFS_backup"
    eval ${var_name}_version_major=${v_array[0]}
    eval ${var_name}_version_minor=${v_array[1]}
    eval ${var_name}_version_patch=${v_array[2]}
}

function exec_script_line {
    local script="$1"
    local line_num="$2"
    local line_str="$(sed $line_num'!d' $script)"
    if [ -z "$line_str" ]; then
        echo "script line is empty"
        exit 1
    fi
    eval "$line_str"
}

version_parse $CBUILD_VERSION local
if [ -z "$CBUILD_INSTALL_DIR" ]; then
    if [ "$1" = "--local" ]; then
        if [ ! -d "$HOME" ]; then
            echo "ERROR: home directory '$HOME' doesn't exist"
            exit 1
        fi
        CBUILD_INSTALL_DIR="$HOME/.local/share/cbuild/${local_version_major}.${local_version_minor}"
        CBUILD_BIN_DIR="$HOME/.local/bin"
        mkdir -p "$HOME/.local"
        mkdir -p "$HOME/.local/share"
        mkdir -p "$HOME/.local/share/cbuild"
        mkdir -p "$HOME/.local/bin"
    else
        CBUILD_INSTALL_DIR="/usr/local/share/cbuild/${local_version_major}.${local_version_minor}"
        CBUILD_BIN_DIR="/usr/local/bin"
        mkdir -p "/usr/local/share"
        mkdir -p "/usr/local/share/cbuild"
        mkdir -p "/usr/local/bin"
    fi
fi

rm -rf "$CBUILD_INSTALL_DIR"
cp -r ./ "$CBUILD_INSTALL_DIR"
rm -rf "$CBUILD_INSTALL_DIR/.git"
ln -sf "$(realpath $CBUILD_INSTALL_DIR/cbuild.sh)" -T "$CBUILD_BIN_DIR/cbuild${local_version_major}.${local_version_minor}"

bootstrap_install_path="$CBUILD_INSTALL_DIR/../bootstrap.sh"
if [ -f "$bootstrap_install_path" ]; then
    exec_script_line "$bootstrap_install_path" 2
    installed_bootstrap_version=$CBUILD_BOOTSTRAP_VERSION
    installed_bootstrap_version_int=$(echo $installed_bootstrap_version | sed 's/\.//g')
    exec_script_line "./bootstrap.sh" 2
    local_bootstrap_version=$CBUILD_BOOTSTRAP_VERSION
    local_bootstrap_version_int=$(echo $local_bootstrap_version | sed 's/\.//g')
    
    if [[ $local_bootstrap_version_int > $installed_bootstrap_version_int ]]; then
        ln -sf "$(realpath $CBUILD_INSTALL_DIR/bootstrap.sh)" -T "$bootstrap_install_path"
    fi
else
    ln -sf "$(realpath $CBUILD_INSTALL_DIR/bootstrap.sh)" -T "$bootstrap_install_path"
fi
ln -sf "$(realpath $bootstrap_install_path)" -T "$CBUILD_BIN_DIR/cbuild"