#!/usr/bin/env bash

osm_source_prefix="https://download.geofabrik.de/"
osm_source_suffix="-latest.osm.pbf"
osm_source_name="geofabrik"

bounds_dir="/data/build/bounds"
build_dir="/data/build/tmp"
maps_dir="/data/build/osm/$osm_source_name"
out_dir="/data/maps"
styles_dir="/data/styles"
tiles_dir="/data/build/tiles"

function die() {
    echo "Error: $1"
    exit 255
}

function check_osm_region_exists() {
    region="$1"
    exists="true"

    curl -ILs --fail "$(get_pbf_url "$region")" &> /dev/null
    [[ $? != 0 ]] && exists="false"

    echo $exists   
}

function check_osm_update() {
    region="$1"
    region_path="$maps_dir/$(get_region_shortname "$region").osm.pbf"
    update="true"

    md5="$(curl -Ls --fail "$(get_pbf_url "$region").md5" | cut -d' ' -f1)"
    
    if [[ $? == 0 ]]; then
        if [[ -f "$region_path" ]]; then
            if [[ "$(get_md5 "$region_path")" == "$md5" ]]; then
                update="false"
            fi
        fi
    fi

    echo $update
}

function exec_mkgmap() {
    java -jar /opt/mkgmap/mkgmap.jar $@
}

function exec_splitter() {
    java -jar /opt/splitter/splitter.jar $@
}

function get_md5() {
    file="$1"
    echo "$(md5sum "$file" | cut -d' ' -f1)"
}

function get_md5_dir() {
    dir="$1"
    echo "$(find "$dir" -type f -name "*.*" -exec md5sum {} + | awk '{print $1}' | sort | md5sum)"
}

function get_pbf_url() {
    region="$1"
    echo "${osm_source_prefix}${region}${osm_source_suffix}"
}

function get_region_shortname() {
    region="$1"
    echo "${region##*/}"
}