#!/usr/bin/env bash

# Hopefully one day this will be a full featured Pleroma client.
# Let's see how far we can get. :)

# Display usage information.
help() {
    echo "${0##*/}"
    echo "Released under the terms of the WTFPL License"
    echo -e "Usage:\n"
    echo "With no arguments, open the interactive client."
    for i in "${!command[@]}" ; do
        echo "-${i/:/ <parameter>}: ${command[${i}]}"
    done | sort
    echo
    echo "Configuration files can be found in ${configPath}"
    echo
    exit 0
}


# Get an oauth token
get_oauth_token() {
    echo "Welcome to ${softwareName}!"
    echo
    echo "Let's get you connected to your instance."
    while [[ -z "${instanceURL}" ]]; do
        echo
        read -er -p "Enter the URL of a Pleroma instance: " instanceURL
        if [[ ! "${instanceURL}" =~ ^https:// ]]; then
            instanceURL="https://${instanceURL}"
        fi
    done
    redirectURI="urn:ietf:wg:oauth:2.0:oob"
    website="https://git.stormux.org/storm/ratatoskr"
    # get client id and secret
    curl -s -X POST -d client_name="${softwareName}" -d "redirect_uris=${redirectURI}" -d "scopes=read write follow push" -d "website=${website}" "${instanceURL}/api/v1/apps" |
        jq --raw-output '"client_id=\"\(.client_id)\"\nclient_secret=\"\(.client_secret)\""' > "${configPath}/${configFile}"
        # Load the new variables from the configuration file
        source "${configPath}/${configFile}"
    # Create the url to get the oauth token
    local url="${instanceURL}/oauth/authorize?client_id=${client_id}&redirect_uri=${redirectURI}&response_type=code&scope=read%20write%20follow%20push"
    echo "Please open the following url in your browser."
    echo "Copy the generated token, and paste it here, then press enter to continue."
    echo
    if command -v xclip &> /dev/null ; then
        echo "${url}" | tee >(xclip -selection clipboard -d "${DISPLAY:-:0}" 2> /dev/null &&
            echo "For convenience the url has been copied to your clipboard.")
    else
        echo "${url}"
    fi
    echo
    read -er oauth_token
    # This is actually a authorization token, so get  the actual token.
    oauth_token="$(curl -sS -d "client_id=${client_id}" -d "client_secret=${client_secret}" -d "code=${oauth_token}" -d "grant_type=authorization_code" "${instanceURL}/oauth/token" | jq --raw-output '(.access_token)')"
    echo "oauth_token=\"${oauth_token}\"" >> "${configPath}/${configFile}"
    echo "instanceURL=\"${instanceURL}\"" >> "${configPath}/${configFile}"
}


# Functions that deal with posting.

# Post music with -M flag
post_music() {
    curl -vS --oauth2-bearer "${oauth_token}" \
        -d "$(playerctl metadata -f 'album={{album}}')" \
        -d "$(playerctl metadata -f 'artist={{artist}}')" \
        -d "$(playerctl metadata -f 'title={{title}}')" \
        "${instanceURL}/api/v1/pleroma/scrobble"
    exit 0
}


# Variable initialization
configPath="${XDG_CONFIG_HOME:-$HOME/.config}/ratatoskr" # Path for settings, usually ~/.config/ratatoskr
configFile="default.conf" # The default config file, eventually will support multiple accounts.
softwareName="Ratatoskr" # The name of the client.


# Main code starts here

# make sure the configuration path exists:
mkdir -p "${configPath}"

# Associative array of command line parameters and short description of what they do.
declare -A command=(
    [C]="Recreate default configuration file. Acquire new oauth token."
    [h]="Help, show usage information for ${0##*/}."
    [M]="Post the currently playing music track, requires playerctl."
)

# if the default file doesn't exist, create it
if [[ ! -e "${configPath}/${configFile}" ]]; then
    get_oauth_token
else
    # Read configuration file
    source "${configPath}/${configFile}"
fi

# Handle command line parameters
# Convert the keys of the associative array to a format usable by getopts
args="${!command[*]}"
args="${args//[[:space:]]/}"
while getopts "${args}" i ; do
    case "$i" in
        C) get_oauth_token;;
        h) help;;
        M) post_music;;
    esac
done


exit 0