#!/usr/bin/env bash

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

# Handle subprocesses that may not close with the main program.
trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT


# 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}"
}


play_sound() {
    if [[ "${enable_sound}" == "false" ]]; then
        return
    fi
    local soundFile="${configPath}/soundpacks/${sound_pack:-default}/${1}.opus"
    if [[ -e "${soundFile}" ]]; then
    sox -qV0 "${soundFile}" -d &> /dev/null &
    fi
}


# Functions that deal with posting.

# Scrobble music with -S flag
scrobble_music() {
    local result
    result="$(curl -sS --oauth2-bearer "${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")"
    # Check for errors
    if [[ $? -ne 0 ]]; then
        echo "there was a problem contacting the server"
        play_sound error
        exit 1
    fi
    local error="$(echo "$result" | jq -r '.error')"
    if [[ "$error" != "null" ]]; then
        echo "Error: $error"
        play_sound error
        exit 1
    fi
    echo "Track scrobbled!"
    play_sound scrobble
}


# Post music with -M flag requires playerctl.
post_music() {
    local text="$(playerctl metadata -f 'Now playing "{{title}}" by "{{artist}}" from "{{album}}" via "{{playerName}}"')"
    text="${text//Now playing \"\"/Now Playing}"
    text="${text// by \"\"/}"
    text="${text// from \"\"/}"
    if [[ "${text}" =~ ^"Now playing via" ]]; then
        echo "Error, no music was detected. Maybe it is not properly tagged?"
        play_sound error
        exit 1
    fi
    local link="$(playerctl metadata -f '{{xesam:url}}')"
    if [[ "${link}" =~ ^file:// ]]; then
        link="https://www.youtube.com/results?search_query=$(playerctl metadata -f '{{artist}} {{title}}' | urlencode -b)"
    fi
    local json=$(jq -n --arg status "[${text}](${link})" --arg spoiler_text "Music" --arg content_type "text/markdown" '{status: $status, spoiler_text: $spoiler_text, content_type: $content_type}')
    local result
    result="$(curl -sS --oauth2-bearer "${oauth_token}" -H "Content-Type: application/json" \
        -d "$json" \
        "${instanceURL}/api/v1/statuses")"
    # Check for errors
    if [[ $? -ne 0 ]]; then
        echo "there was a problem contacting the server"
        play_sound error
        exit 1
    fi
    local error="$(echo "$result" | jq -r '.error')"
    if [[ "$error" != "null" ]]; then
        echo "Error: $error"
        play_sound error
        exit 1
    fi
    echo "Music posted!"
    play_sound post_music
}


# Post status with -p flag, command line.
post_status() {
    if [[ "${1}" == "" ]]; then
        return
    fi
    local statusText="$@"
    local statusVisibility="${statusVisibility:-public}"
    local statusContent_type="${statusContent_type:-text/markdown}"
    local statusSpoiler_text=""
    local statusJson="$(jq -n --arg status "$statusText" \
        --arg spoiler_text "$statusSpoiler_text" \
        --arg visibility "$statusVisibility" \
        --arg content_type "$statusContent_type" \
        '{ status: $status, spoiler_text: $spoiler_text, visibility: $visibility, content_type: $content_type }')"
    local statusResult
    statusResult="$(curl -sS --oauth2-bearer "${oauth_token}" -H "Content-Type: application/json" \
        -d "$(echo "$statusJson" | jq 'if .spoiler_text == "" then del(.spoiler_text) else . end | if .visibility == "" then del(.visibility) else . end')" \
        "${instanceURL}/api/v1/statuses")"
    if [[ $? -ne 0 ]]; then
        echo "there was a problem contacting the server"
        play_sound error
        exit 1
    fi
    local error="$(echo "$statusResult" | jq -r '.error')"
    if [[ "$error" != "null" ]]; then
        echo "Error: $error"
        play_sound error
        exit 1
    fi
    echo "Status posted!"
    play_sound post
}




# Display timelines
show_timeline() {
    result="$(curl -sS --oauth2-bearer "${oauth_token}" "${instanceURL}/api/v1/timelines/${timeline:-home}")"
                                                                                                                                                                
    # Error checking
    # Check if the result is a valid JSON
    if ! echo "$result" | jq '.' >/dev/null 2>&1; then
        echo "Error: The response from the server was invalid."
        play_sound error
        return
    fi
                                                                                                                                                                
    if [[ "${result}" == "${oldResult}" ]]; then
        return
    elif [[ ${#oldResult} -gt 5 ]]; then
        local temperaryVariable="${result}"
        result="${result//${oldResult%\]}/}"
        result="${result%,\]}]"
        oldResult="${temperaryVariable}"
        play_sound new_${timeline:-home}
    fi

    error=$(echo "$result" | jq -r '.error // "null"' 2> /dev/null)
    if [[ "${error:-null}" != "null" ]]; then
        echo "Error fetching ${timeline:-home} timeline: $error"
        play_sound error
        return
    fi
                                                                                                                                                                
    # handle new events
    events="$(jq -r '.[].content' <<< "$result")"
    spoiler_text="$(jq -r '.[].spoiler_text' <<< "$result")"
    created_at="$(jq -r '.[].created_at' <<< "$result")"
    stripped_events="$(echo "$events" | sed -E 's/<[^>]+>//g')"
    stripped_events="${stripped_events//&#39;/\'}"
    usernames="$(jq -r '.[].account.username' <<< "$result")"
    echo -e "$usernames" | while read -r username; do
        spoiler="$(echo "$spoiler_text" | head -n 1)"
        created="$(echo "$created_at" | head -n 1)"
        created="${created%.*}"
        created="${created/T/ at }"
        if [ -z "$spoiler" ]; then
            echo "$username: $(echo "$stripped_events" | head -n 1)"
            echo "Posted $created"
        else
            echo "$username [$spoiler]: $(echo "$stripped_events" | head -n 1)"
            echo "Posted $created"
        fi
        stripped_events="$(echo "$stripped_events" | tail -n +2)"
        spoiler_text="$(echo "$spoiler_text" | tail -n +2)"
        created_at="$(echo "$created_at" | tail -n +2)"
        echo
    done
    oldResult="${result}"
}


# 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

# Check for dependencies
dependencies=(
    "jq"
    "sox"
    "urlencode"
)

for i in "${dependencies[@]}" ; do
    if ! command -v "$i" &> /dev/null ; then
        echo "Missing dependency: $i"
        exit 2
    fi
done


# make sure the configuration and soundpack paths exist:
mkdir -p "${configPath}/soundpacks"

# Keep track of the backgrounded loop

# 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."
    [p]="Post from the command line, e.g. ${0##*/} -p \"hello world\""
    [S]="Scrobble 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
            exit 0;;
        p)
            post_status "${OPTARG:-$(cat)}"
            exit 0;;
        S)
            scrobble_music
            exit 0;;
    esac
done


# Main loops
# Display timelines and requested information.
while : ; do
    show_timeline
    sleep "${interval:-300}"
done &


# Handle commands
while : ; do
    # Command prompt:
    read -er command
    if [[ ! "${command}" =~ ^/ ]]; then
        post_status "${command}"
        continue
    fi
    case "${command}" in
        "/exit"|"/quit")
            exit 0
        ;;
        "/refresh")
            show_timeline
        ;;
        *)
            echo "Error: '${command}' is not a valid command."
            play_sound error
        ;;
    esac
done


exit 0