#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  args: "Foo Fighters"
#
#  Author: Hari Sekhon
#  Date: 2020-07-05 14:33:55 +0100 (Sun, 05 Jul 2020)
#
#  https://github.com/HariSekhon/DevOps-Bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/HariSekhon
#

# https://developer.spotify.com/documentation/web-api/reference/search/search/

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# shellcheck disable=SC1090,SC1091
. "$srcdir/lib/spotify.sh"

# shellcheck disable=SC2034,SC2154
usage_description="
Searches the Spotify API and returns the first N tracks / artists / albums that match the given search expression

See this page for documentation on how to write query expressions:

https://developer.spotify.com/documentation/web-api/reference/search/search/

Example:

    ./${0##*/} artist:foo fighters track:arlandria

    ./${0##*/} artist:\"Foo Fighters\" track:arlandria

API JSON is returned, used by adjacent spotify_search*.sh scripts


Environment variable options:

\$SPOTIFY_SEARCH_TYPE  = track # default
                        artist
                        album

\$SPOTIFY_SEARCH_LIMIT = 1 # default

\$SPOTIFY_SEARCH_OFFSET = 0 # default


Caveat: the Spotify API returns unicode characters eg.

    Blue Öyster Cult - (Don't Fear) The Reaper

but these same unicode characters when fed back in to the Spotify Search API find no entries and only work if you were feed in simple characters ie. convert the Öyster to Oyster or url encode them before passing them to this script.


$usage_auth_help
"

# used by usage() in lib/utils.sh
# shellcheck disable=SC2034
usage_args="'<search_expression>"

help_usage "$@"

min_args 1 "$@"

# let user use full query and put artist: / album: / track: prefixes themselves
#if [ $# -gt 1 ]; then
#    artist="$1"
#    # encode spaces between search terms with %20 or +
#    artist="${artist// /+}"
#    shift || :
#fi
#track="$*"
#track="${track// /+}"

# this substitution doesn't work on $* so have to do it in 2 steps
search_terms="$*"
shopt -s extglob
# replace multiple spaces with a single plus, requires extglob
search_terms="${search_terms//+([[:space:]])/%20}"

# quotes break search unless urlencoded - but url encoding the entire search string using urlencode.sh breaks everything so just replace the quotes
# XXX: also quoting only seems to work for simple queries, not highly specific ones like artist:blah track:blah which don't seem to work whether you try artist:"blah" track:"blah" or "artist:blah track:blah" - so best to leave them off
# XXX: this escaping is necessary for when tracks have quotes inside their names - ie. part of the data, not part of the search tricks
search_terms="${search_terms//\"/%22}"

# looks like rather than URL encoding single quotes the Spotify API strips them out - replacing with urlencoded fails to match, but if you strip them out or just leave them in for the Spotify API itself to strip out then it returns the correct results
#search_terms="${search_terms//\'/%27}"
#search_terms="${search_terms//\'/}"

# brackets also work in searches - don't get complicated here
#search_terms="${search_terms//[^[:alnum:][:space:]:%-]/}"

spotify_token

search_type="${SPOTIFY_SEARCH_TYPE:-track}"
if [ -n "${SPOTIFY_SEARCH_LIMIT:-}" ]; then
    limit="$SPOTIFY_SEARCH_LIMIT"
    if ! [[ "$limit" =~ ^[[:digit:]]+$ ]]; then
        echo "Invalid \$SPOTIFY_SEARCH_LIMIT = $limit found in environment" >&2
        exit 1
    fi
elif [ -n "${DEBUG:-}" ]; then
    limit=20
else
    limit=1
fi

offset="${SPOTIFY_SEARCH_OFFSET-0}"

# causes errors if trying to query more than the max limit of 50
if [ "$limit" -gt 50 ]; then
    limit=50
fi

url_path="/v1/search?type=$search_type&offset=$offset&limit=$limit"

# "Access token has no market information" - can't see how to set this in docs
#if [ -z "${NO_MARKET:-}" ]; then
#    # restrict to tracks available to the local market - this is more useful for being able to immediately use the returned URI to put in a playlist
#    url_path+="&market=from_token"
#fi

# quoting will preserve order of terms but will probably not work when putting artist and track name in the args
#url_path+="&q=\"$search_terms\""
url_path+="&q=$search_terms"
#url_path+="&q=artist:$artist+track:$track"

"$srcdir/spotify_api.sh" "$url_path"