#!/bin/sh
set -e

src_path="${SERIES_SRC_PATH:-/media/hdd1/media/series}"
link_path="${SERIES_LINK_PATH:-}"

find_series() {
    find "$src_path" -maxdepth 1 -printf "%f\\n" | sort | grep -v "$(basename "$src_path")"
}

next() {
    find . -maxdepth 1 -printf "%f\\n" | sort | grep -A1 "$(readlink "$current")" | tail -n 1
}

if [ "$#" -ne 1 ]; then
    echo "Usage: $0 SERIES | list"
    exit 1
fi

# get config_path for mpv's input.conf
if [ -L "$(command -v "$0")" ]; then
    conf_path="$(cd "$(dirname "$(command -v "$0")")" && cd "$(dirname "$(readlink "$0")")" && pwd)"
else
    conf_path="$(cd "$(dirname "$0")" && pwd)"
fi

# check for "list" argument
if [ "$1" = "list" ]; then
    find_series
    exit 0
fi

# if no "list" argument find series and play, if viewed to the end, set
# "${series}_current" symlink to next
find_series | while read -r series; do
    if [ "$1" = "$series" ]; then
        cd "$src_path/$series"
        # use absolute or relative linking
        if [ -z "$link_path" ]; then
            src_path=""
            current="${series}_current"
        else
            src_path="$src_path/$series/"
            current="${link_path}/${series}_current"
        fi

        # create first symlink if series was never watched before
        if [ ! -f "$current" ]; then
            ln -s "$src_path$(find . -maxdepth 1 -printf "%f\\n" | tail -n+2 | sort | head -n1)" "$current"
        fi

        echo "Playing: $(readlink "$current")"
        mpv --input-conf "${conf_path}/input.conf" "$current" && ln -sf "$src_path$(next)" "$current"
    fi
done