#!/bin/bash

export PLATFORM

has() {
    which "$1" >/dev/null 2>&1
    return $?
}

ink() {
    if [ "$#" -eq 0 -o "$#" -gt 2 ]; then
        return 1
    fi

    local open="\033["
    local close="${open}0m"
    local black="0;30m"
    local red="1;31m"
    local green="1;32m"
    local yellow="1;33m"
    local blue="1;34m"
    local purple="1;35m"
    local cyan="1;36m"
    local gray="0;37m"
    local white="$close"

    local text="$1"
    local color="$close"

    if [ "$#" -eq 2 ]; then
        text="$2"
        case "$1" in
            black | red | green | yellow | blue | purple | cyan | gray | white)
                eval color="\$$1"
                ;;
        esac
    fi

    printf "${open}${color}${text}${close}"
}

log() {
    if [ "$#" -eq 0 -o "$#" -gt 2 ]; then
        return 1
    fi

    local color=
    local text="$2"

    case "$1" in
        TITLE)
            color=yellow
            ;;
        ERROR | WARN)
            color=red
            ;;
        INFO)
            color=green
            ;;
        SUCCESS)
            color=green
            ;;
        *)
            text="$1"
    esac

    timestamp() {
        ink gray "["
        ink purple "$(date +%H:%M:%S)"
        ink gray "] "
    }

    timestamp; ink "$color" "$text"; echo
}

ok() {
    log SUCCESS "$1"
}

die() {
    log ERROR "$1" 1>&2
}

lower() {
    if [ $# -eq 0 ]; then
        cat <&0
    elif [ $# -eq 1 ]; then
        if [ -f "$1" -a -r "$1" ]; then
            cat "$1"
        else
            echo "$1"
        fi
    else
        return 1
    fi | tr "[:upper:]" "[:lower:]"
}

ostype() {
    uname | lower
}

# os_detect export the PLATFORM variable as you see fit
os_detect() {
    export PLATFORM
    case "$(ostype)" in
        *'linux'*)  PLATFORM='linux'   ;;
        *'darwin'*) PLATFORM='darwin'  ;;
        *'bsd'*)    PLATFORM='bsd'     ;;
        *)          PLATFORM='unknown' ;;
    esac
}

extract() {
    if [ -f "$1" ] ; then
        case "$1" in
            *.tar.bz2) tar xvjf   "$1" ;;
            *.tar.gz)  tar xvzf   "$1" ;;
            *.bz2)     bunzip2    "$1" ;;
            *.rar)     unrar x    "$1" ;;
            *.gz)      gunzip     "$1" ;;
            *.tar)     tar xvf    "$1" ;;
            *.tbz2)    tar xvjf   "$1" ;;
            *.tgz)     tar xvzf   "$1" ;;
            *.zip)     unzip      "$1" ;;
            *.Z)       uncompress "$1" ;;
            *.7z)      7z x       "$1" ;;
            *)         return 1        ;;
        esac
    else
        echo "missing file" 1>&2
        return 1
    fi
}

check_dependencies(