#!/bin/bash

#******************************************
# TalkLib.sh - A library for interacting with Nextcloud Spreed app
#
# This script provides functions interact with Nextcloud Spreed/Talk app.
# It uses the Nextcloud OCS API to retrieve data from server in JSON format.
# by Oliver Zienert - Date: 2025-06-17
#****************************************** 

#this constants is used to control the debug output
#Set libDebug to true to enable debug output, false to disable
libDebug=false

# logging functions
# These functions are used to log messages to the console
# Usage: info "sender" "Your message here" 
function info()
{
    echo -e "[\033[1;34mINFO::$1\033[0m] - $2" >&2
}
# Usage: error "sender" "Your message here" 
function error()
{
    echo -e "[\033[1;31mERROR::$1\033[0m] - $2" >&2
}
# Usage: debug "sender" "Your message here" (if libDebug is true)
function debug()
{
    if [ "$libDebug" == true ]; then
        echo -e "[\033[1;33mDEBUG::$1\033[0m] - $2" >&2
    fi
}

#******************************************
# Server functions for Nextcloud Spreed app
# These functions are used to interact with the Nextcloud Spreed app
# They make HTTPS (http is not working) requests to the Nextcloud server and return JSON responses.
# !! These functions do not validate parameters, so ensure that the parameters are correct before calling them.
#******************************************

# Function to get all rooms of a user from Nextcloud Spreed app
# Usage: getAllRoomsOfUser <NC_URL> <NC_USER> <NC_APP_PASSWORD>
# Returns: JSON response containing rooms details or an empty string on failure
#+
function getAllRoomsOfUser()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3

    debug "getAllRoomsOfUser" "Getting all rooms for user: $NC_USER"
    
    response=$(curl --proto 'https' --proto-redir "https" -s -u "$NC_USER:$NC_APP_PASSWORD" "$NC_URL/ocs/v2.php/apps/spreed/api/v4/room?format=json" \
        -H "OCS-APIRequest: true")

    echo $response
}

# Function to get details of a specific room from Nextcloud Spreed app
# Usage: getRoomDetails <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID>
# Returns: JSON response containing room details or an empty string on failure
#- funktioniert noch nicht
function getRoomDetails()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4

    debug "getRoomDetails" "Getting details for Room: $ROOM_ID"

    response=$(curl --proto 'https' --proto-redir "https" -s -u "$NC_USER:$NC_APP_PASSWORD" \
        "$NC_URL/ocs/v2.php/apps/spreed/api/v4/room/$ROOM_ID?format=json" \
        -H "OCS-APIRequest: true")
    
    debug "getRoomDetails" "Response: $response"

    echo $response
}



# Function to send a message to a specific room in Nextcloud Spreed app
# Usage: sendMessage2Room <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID> <MESSAGE>
#+
function sendMessage2Room()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4
    MESSAGE=$5

    response=$(curl --proto 'https' --proto-redir 'https' -s -u "$NC_USER:$NC_APP_PASSWORD" -X POST \
        -d "message=$MESSAGE" \
        "$NC_URL/ocs/v2.php/apps/spreed/api/v1/chat/$ROOM_ID?format=json" \
        -H "OCS-APIRequest: true" ) 
    echo $response 
}

# Function to get the context of a specific message in a room in Nextcloud Spreed app
# Usage: getMessage <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID> <MESSAGE_ID>
# Returns: JSON response containing message context or an empty string on failure
#funkioniert noch nicht
function getMessage()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4
    MESSAGE_ID=$5
    
    debug "getMessage" "Getting message context for Room: $ROOM_ID, Message ID: $MESSAGE_ID"
    
    response=$(curl --proto 'https' --proto-redir 'https' -s -u "$NC_USER:$NC_APP_PASSWORD" \
        "$NC_URL/chat/$ROOM_ID/$MESSAGE_ID/context/?format=json" \
        -H "OCS-APIRequest: true")

    echo $response
}
function getUsersInRoom()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4

    debug "getUsersInRoom" "Getting users in room: $ROOM_ID"

    response=$(curl --proto 'https' --proto-redir 'https' -s -u "$NC_USER:$NC_APP_PASSWORD" \
        "$NC_URL//ocs/v2.php/apps/spreed/api/v4/room/$ROOM_ID/participants?format=json" \
        -H "OCS-APIRequest: true")
    
    echo $response   
}
# Function to send a file to a specific room in Nextcloud Spreed app
# Usage: sendFile2Room <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID> <LOCAL_FILENAME> <NC_FILENAME> <MESSAGE_ID>
#+
function sendFile2Room()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4
    LOCAL_FILENAME=$5
    NC_FILENAME=$6
    MESSAGE_ID=$7

    debug "sendFile2Room" "Uploading file to Nextcloud: $LOCAL_FILENAME as $NC_FILENAME in room $ROOM_ID with message ID $MESSAGE_ID"

    #upload the file to Nextcloud
    curl -u $NC_USER:$NC_APP_PASSWORD -T $LOCAL_FILENAME "$NC_URL/remote.php/dav/files/$NC_USER/$NC_FILENAME" \
        -H "OCS-APIRequest: true" \
        -H "Content-Type: application/octet-stream" \
        -H "X-Requested-With: XMLHttpRequest"
    
    if [ $? -ne 0 ]; then
        error "Failed to upload file $LOCAL_FILENAME to Nextcloud"
        return
    fi
    debug "sendFile2Room" "File $LOCAL_FILENAME uploaded successfully to Nextcloud as $NC_FILENAME"

    #publish the file to the room
    response=$(curl -s -u "$NC_USER:$NC_APP_PASSWORD" \
        "$NC_URL/ocs/v2.php/apps/files_sharing/api/v1/shares?format=json" \
        -X POST \
        -H "OCS-APIRequest: true" \
        -H "Content-Type: application/json" \
        -d "{ \"shareType\": 10, \"shareWith\": \"$ROOM_ID\", \"path\": \"$NC_FILENAME\" }")

    if [ $? -ne 0 ]; then
        error "Failed to share file $NC_FILENAME with room $ROOM_ID"
    fi
    debug "sendFile2Room" "$response"
    echo $response
}   

# Function to send a message with a file attachment to a specific room in Nextcloud Spreed app
# Usage: sendMessageWithFile <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID> <LOCAL_FILENAME> <NC_FILENAME> <MESSAGE>
# Returns: JSON response containing the message ID or an error message on failure
# This function first sends a message to the room, then uploads the file and attaches it to the message.
# It returns the response from the file upload, which includes the message ID.
# Note: The file must be accessible on the local filesystem where this script is run.
#       The file will be uploaded to Nextcloud and attached to the message.
function sendMessageWithFile()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4
    LOCAL_FILENAME=$5
    NC_FILENAME=$6
    MESSAGE=$7

    debug "sendMessageWithFile" "Sending message with file to room: $ROOM_ID"
    debug "sendMessageWithFile" "Local filename: $LOCAL_FILENAME"
    debug "sendMessageWithFile" "Serverfilename: $NC_FILENAME"
    debug "sendMessageWithFile" "Message: $MESSAGE"
    
    #erzeuge Message an den die Datei angehängt werden soll und speichere die ID der Nachricht in mesgId
    mesgId=$(sendMessage2Room "$NC_URL" "$NC_USER" "$NC_APP_PASSWORD" "$ROOM_TOKEN" "$MESSAGE" | jq -r '.ocs.data.id' )
    debug "sendMessageWithFile" "Message sent with ID: $mesgId"
    #sende die Datei an die Nachricht
    #[todo check mesgId]
    debug "sendMessageWithFile" "uploading file $LOCAL_FILENAME to $NC_FILENAME"
    response=$(sendFile2Room "$NC_URL" "$NC_USER" "$NC_APP_PASSWORD" "$ROOM_TOKEN" "$LOCAL_FILENAME" "$NC_FILENAME" "$mesgId")
    echo $response
}


# Function to mark a message as read in a specific room in Nextcloud Spreed app
# Usage: markMessageAsRead <NC_URL> <NC_USER> <NC_APP_PASSWORD> <ROOM_ID> <MESSAGE_ID>
#+
function markMessageAsRead()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    ROOM_ID=$4
    MESSAGE_ID=$5

    response=$(curl --proto 'https' --proto-redir 'https' -s -u "$NC_USER:$NC_APP_PASSWORD" -X POST \
        "$NC_URL/ocs/v2.php/apps/spreed/api/v1/chat/$ROOM_ID/read?format=json" \
        -H "OCS-APIRequest: true" \
        -d "lastReadMessage=$MESSAGE_ID")

    echo $response
}
#erstellt einen neuen Raum mit dem angegebenen Benutzer
function createOne2OneRoom()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    TARGET_USER=$4

    response=$(curl --proto 'https' --proto-redir 'https' -s -u "$NC_USER:$NC_APP_PASSWORD" -X POST \
        "$NC_URL/ocs/v2.php/apps/spreed/api/v4/room?format=json" \
        -H "OCS-APIRequest: true" \
        -d "invite=$TARGET_USER" \
        -d "type=1" )
        
    echo $response
} 
# Function to get details of a specific User from Nextcloud 
# Usage: getDetailsOfUser <NC_URL> <NC_USER> <NC_APP_PASSWORD> <NC_USER2Check>
# Returns: JSON response containing Useraccount details or an empty string on failure
function getDetailsOfUser()
{
    NC_URL=$1
    NC_USER=$2
    NC_APP_PASSWORD=$3
    NC_USER2Check=$4

    debug "getDetailsOfUser" "Getting Account Details for user: $NC_USER2Check"
    
    response=$(curl --proto 'https' --proto-redir "https" -s -u "$NC_USER:$NC_APP_PASSWORD" \
        "$NC_URL/ocs/v1.php/cloud/users/{$NC_USER2Check}?format=json" \
        -H "OCS-APIRequest: true")

    echo $response 
}

#abhängigkeits-Check
for cmd in curl jq; do
    if ! command -v "$cmd" >/dev/null 2>&1; then
        error "TalkLib" "Benötigtes Programm '$cmd' ist nicht installiert. Bitte installieren und erneut versuchen."
        exit 1
    fi
done