#!/usr/bin/env bash

. /app/utils.sh

region="$1"
style="$2"

cwd="$(pwd)"

function build_gmap() {
    region="$1"
    style="$2"

    region_shortname="$(get_region_shortname "$region")"

    bounds_dir_md5="$(get_md5_dir "$bounds_dir")"
    map_md5="$(get_md5 "$maps_dir/$region_shortname.osm.pbf")"
    version="$(echo "$bounds_dir_md5|$map_md5" | md5sum | cut -d' ' -f1)"

    generated_map_dir="$out_dir/$region_shortname/"
    version_path="$generated_map_dir/version.txt"

    build="true"
    build_failed="false"

    if [[ -n "$style" ]]; then
        style="$styles_dir/$style.TYP"
    fi

    mkdir -p "$generated_map_dir"

    if [[ -f "$version_path" ]]; then
        if [[ $(cat "$version_path") == "$version" ]]; then
            build="false"
        fi
    fi

    if [[ $build == "true" ]]; then
        cd "$build_dir"

        exec_mkgmap \
            --add-pois-to-areas \
            --bounds="$bounds_dir" \
            --gmapsupp \
            --index \
            --route \
            $tiles_dir/$region_shortname/6324*.osm.pbf $style

        [[ $? != 0 ]] && build_failed="true"
        cd "$cwd"

        if [[ $build_failed == "false" ]]; then
            rm -f $generated_map_dir/*
            
            mv "$build_dir/gmapsupp.img" "$generated_map_dir/"
            mv "$build_dir/osmmap.img" "$generated_map_dir/"
            mv "$build_dir/osmmap.tdb" "$generated_map_dir/"
            echo "$version" > "$version_path"

            rm -f $build_dir/*
        else
            rm -f $build_dir/*
        fi
    fi
}

function cleanup() {
    rm -f "$build_dir/*"
}

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

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

function update_bounds() {
    function download_bounds() {
        type="$1"
        bounds_url_prefix="https://www.thkukuk.de/osm/data"
        
        curl -L --fail "$bounds_url_prefix/$type-latest.zip" -o "$bounds_dir/$type.zip"
        unzip -o "$bounds_dir/$type.zip" -d "$bounds_dir"
        rm -f "$bounds_dir/$type.zip"
    }

    download_bounds "bounds"
    download_bounds "sea"
}

function update_osm_map() {
    region="$1"
    region_filename="$(get_region_shortname "$region").osm.pbf"
    region_path="$maps_dir/$region_filename"

    curl -L "$(get_pbf_url "$region")" -o "$region_path"
}

function update_tiles() {
    region="$1"
    region_tiles_dir="$tiles_dir/$(get_region_shortname "$region")"

    mkdir -p "$region_tiles_dir"
    rm -rf "$region_tiles_dir/*"
    cd "$region_tiles_dir" # HACK: --output-dir doesn't work

    exec_splitter "$maps_dir/$(get_region_shortname "$region").osm.pbf"

    cd "$cwd"
}

mkdir -p "$bounds_dir"
mkdir -p "$build_dir"
mkdir -p "$maps_dir"
mkdir -p "$out_dir"
mkdir -p "$tiles_dir"

if [[ -z $region ]]; then
    die "No region specified"
fi

if [[ "$(check_osm_region_exists "$region")" == "true" ]]; then
    echo "👀 Checking for OSM updates..."
    if [[ "$(check_osm_update "$region")" == "true" ]]; then
        [[ $? != 0 ]] && die "Region \"$region\" does not exist"

        echo "🌍 Updating OSM map: $region"
        update_osm_map "$region"

        echo "📒 Updating bounds and sea..."
        update_bounds

        echo "✂️ Building tiles: $region"
        update_tiles "$region"
    fi

    echo "🔨 Building Garmin map: $region"
    build_gmap "$region" "$style"
else
    [[ $? != 0 ]] && die "Region \"$region\" does not exist"
fi

echo "🧹 Cleaning up..."
cleanup