#!/usr/bin/env bash

. /app/utils.sh

regions="$1"
style="$2"

cwd="$(pwd)"

function build_gmap() {
    # TODO: Set name (currently is "OSM street map")
    #       Use --housenumbers?
    #       A way to pass extra options
    #       Change ID (currently is 63240000)

    region="$1"
    region_id="$2"
    style="$3"

    region_shortname="$(get_region_shortname "$region")"
    generated_map_dir="$out_dir/$region_shortname/"
    version_path="$generated_map_dir/version.txt"

    bounds_dir_md5="$(get_md5_dir "$bounds_dir")"
    map_md5="$(get_md5 "$maps_dir/$region_shortname.osm.pbf")"
    style_md5="$(get_md5 "$styles_dir/$style.TYP")"

    version_id=""
    version_md5="$(echo "$bounds_dir_md5|$map_md5|$style_md5" | md5sum | cut -d' ' -f1)"

    if [[ -f "$version_path" ]]; then
        version_id="$(cat "$version_path" | cut -d'|' -f1)"
        version_id="$((version_id+1))"
    fi

    version="$version_id|$version_md5"

    build="true"
    build_failed="false"

    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 \
            --description="$(echo "${region##*/}" | sed -e "s/-/ /g" | sed -e "s/\b\(.\)/\u\1/g" | sed -e "s/ /-/g")" \
            --add-pois-to-areas \
            --bounds="$bounds_dir" \
            --index \
            --route \
            --gmapsupp \
            $tiles_dir/$region_shortname/6324*.osm.pbf \
            "$styles_dir/$style.TYP"

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

        rm -f "$styles_dir/x$style.TYP"
    fi
}

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

function update_bounds() {
    function update_bound_item() {
        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"
    }

    update_bound_item "bounds"
    update_bound_item "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"

regions_array="$(echo $regions | tr ";" "\n")"
is_updates="false"

[[ $OSMGARMIN_FORCE_BUILD == "true" ]] && is_updates="true"

if [[ $OSMGARMIN_SKIP_UPDATE_MAPS != "true" ]]; then
    for region in $regions_array; do
        if [[ "$(check_osm_region_exists "$region")" == "true" ]]; then
            if [[ "$(check_osm_update "$region")" == "true" ]]; then
                echo "🌍 Updating OSM map: $region"
                update_osm_map "$region"

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

                [[ $is_updates == "false" ]] && is_updates="true"
            else
                echo "⚠️ No updates for \"$region\""
            fi
        else
            echo "⚠️ Region \"$region\" does not exist"
        fi
    done
else
    is_updates="true"
fi

if [[ $is_updates == "true" ]]; then
    if [[ $OSMGARMIN_SKIP_UPDATE_BOUNDS != "true" ]]; then
        echo "📒 Updating bounds..."
        update_bounds
    fi

    region_id=1

    for region in $regions_array; do
        if [[ "$(check_osm_region_exists "$region")" == "true" ]]; then
            echo "🔨 Building Garmin map: $region"
            build_gmap "$region" "$region_id" "$style"
            ((region_id++))
        fi
    done
else
    echo "⚠️ No new maps. Not building (set \$OSMGARMIN_FORCE_BUILD=true to override)"
fi

echo "🧹 Cleaning up..."
cleanup