#!/usr/bin/env bash

source .env

# 1 = json of the game
download_and_install_game() {
    download_url=$(curl -X GET --silent "$API_URL/packages/${1}/" | jq ".url" | tr -d '"')
    cd games || exit
    wget -O game.zip "${download_url}"
    unzip -oq game.zip
    rm game.zip
    cd ../ # data
}

mkdir -p data/games
cd data || exit
# All mods with their dependencies
calculated_dependencies=()

#Checking for input
if [[ $SERVER_MODS == "" || $SERVER_GAME == "" || $WORLD_NAME == "" ]]; then
    echo "Please, fill .env file before launching this script!"
    exit 1
fi

#Parsing mode names
oIFS="$IFS"
IFS=";"
SERVER_MODS=("$SERVER_MODS")
IFS="$oIFS"

#Downloading game
oIFS="$IFS"
IFS=$'/'
read -r -a servergame <<< "$SERVER_GAME"
IFS="$oIFS"

gameid="${SERVER_GAME}"
game_name="${servergame[1]}"
mods_path="games/${game_name}/mods"

download_and_install_game "${gameid}"

# 1 = mod id
is_game () {
    type=$(curl --silent -X GET "$API_URL/packages/{$1}/" | jq ".type" | tr -d '"')
    if [[ $type = "mod" ]]; then
        echo "false"
    else
        echo "true"
    fi
}

# 1 = mod id
download_and_install_mod () {
    #Parse mod name
    oIFS="$IFS"
    IFS=$'/'
    read -r -a modid <<< "$1"
    IFS="$oIFS"
    modauthor="${modid[0]}"
    modname="${modid[1]}"

    mod_url=$(curl --silent -X GET "$API_URL/packages/${1}/" | jq ".url" | tr -d '"')
    mod_file="${mods_path}/${modname}.zip"
    echo "Writing to ${mod_file} content from url ${mod_url}"
    wget -O "${mod_file}" "${mod_url}"
    unzip -l "${mod_file}" | grep -q mod.conf
    if [[ "$?" == "0" ]]; then # mod.conf found, this is a normal mod
        unzip -oq "${mod_file}" -d "${mods_path}"
    else                       # mod.conf not found, mod is deprecated
        echo "Warning! mod ${modname} is deprecated!"
        deprecated_mod_path="${mods_path}/${modname}"
        echo "Installing it to ${deprecated_mod_path}"
        mkdir -p "${deprecated_mod_path}"
        unzip -oq "${mod_file}" -d "${deprecated_mod_path}"
    fi
    rm "${mod_file}"
}

# 1 = mod id
get_dependencies () {
    calculated_dependencies+=("$1")
    echo Checking deps for "$1"
    deps=$(curl --silent -X GET "$API_URL/packages/${1}/dependencies/")
    deps=$(echo "$deps" | jq ".\"${1}\"")
    mapfile -t deps_array < <(echo "$deps" | jq ".[] | length")
    amount_of_deps="${#deps_array[@]}"

    if [ "$amount_of_deps" -eq 0 ]; then
        echo "No deps for mod"
        return
    fi

    for (( i = 0 ; i < amount_of_deps-1 ; i++ )); do
        #Parse info about dependency
        dependency=$(echo "$deps" | jq ".[${i}]")
        dependency_name=$(echo "$dependency" | jq ".name")
        is_optional=$(echo "$dependency" | jq ".is_optional")
        possible_candidates=$(echo "${dependency}" | jq ".packages")
        possible_candidates_amount=$(echo "${possible_candidates}" | jq "length")
        
        #Checking if the dependency was already satisfied
        calculated_dependencies_amount=${#calculated_dependencies[@]}
    
        dependency_satisfied_with_game=false
        for (( j = 0 ; j < possible_candidates_amount-1 ; j++ )); do
            current_candidate=$(echo "$possible_candidates" | jq ".[${j}]" | tr -d '"')
            if [[ $possible_candidates_amount -eq 1 ]]; then
                break
            fi

            #Check if candidate is the game that is installed
            if [[ "$current_candidate" == "$gameid" ]]; then
                # echo Dependencies satisfied with game
                dependency_satisfied_with_game=true
                break
            fi

            #Check if candidate is game that is not installed
            if [ "$(is_game "$current_candidate")" = "true" ] && [ "$current_candidate" != "$gameid" ]; then

                if [ "${current_candidate}" = "" ] || [ "${current_candidate}" = "null" ]; then
                    continue;
                fi

                possible_candidates=$(echo "$possible_candidates" | jq "del(.[] | select( . == \"${current_candidate}\"))")
                j=$((j-1))
            fi
        done

        possible_candidates_amount=$(echo "${possible_candidates}" | jq "length")
        if [[ $possible_candidates_amount = "" ]]; then
            possible_candidates_amount=0
        fi

        if [[ "$dependency_satisfied_with_game" = true ]]; then
            continue
        fi

        # Check whether one of possible candidates as a dependency was already calculated
        if (( "$calculated_dependencies_amount" > 0 )); then
            for k in $(seq 0 $((calculated_dependencies_amount-1))); do
                for h in $(seq 0 $((possible_candidates_amount-1))); do
                    if [[ "${calculated_dependencies[$k]}" == "${possible_candidates[$h]}" ]]; then
                        continue
                    fi
                done
            done

        # If there's only one candidate for that dependency, then install it without user's confirmation
        fi

        if (( possible_candidates_amount == 0 )); then
            continue
        fi

        if (( possible_candidates_amount == 1)); then
            candidate=$(echo "${possible_candidates[0]}" | jq ".[0]" | tr -d '"')
            calculated_dependencies+=("${candidate}")
            continue
        fi

        got_appropriate_answer=false

        while [ $got_appropriate_answer != true ]; do
            # If dep. is optional you can refuse it
            if [[ "$is_optional" = false ]]; then
                echo "Mod ${1} requires dependency ${dependency_name}."
            else
                echo "Mod ${1} asks for an optional dependency ${dependency_name}."
                echo "(-1) TO CANCEL THIS DEPENDENCY"
            fi

            for j in $(seq 0 $((possible_candidates_amount-1))); do
                echo \("${j}"\) ["$(echo "$possible_candidates" | jq ".[${j}]")"]
            done
            printf "> "
            read -r chose

            if [ "$is_optional" = false ]; then
                if [ "$chose" != $((chose)) ] || [ "$chose" -lt 0 ] || [ "$chose" -gt "$possible_candidates_amount" ]; then
                    echo "Incorrect answer. Please, try again"
                    continue
                else
                    got_appropriate_answer=true
                fi
            else
                if [ "$chose" != $((chose)) ]; then
                    echo "Incorrect answer. Please, try again"
                else
                    got_appropriate_answer=true
                fi
            fi
        done 
        

        if [ "$chose" = "-1" ] && [ "$is_optional" = true ]; then
            continue
        fi
        chosen=$(echo "$possible_candidates" | jq ".[${chose}]" | tr -d '"')
        if [[ ${calculated_dependencies[*]} =~ $chosen ]]; then
            continue
        else
            calculated_dependencies+=("$chosen")
        fi
    done
}


#Downloading mods
#Array to store mods that was required by user
mods_to_install=("")

oIFS="$IFS"
IFS=";"
read -r -a mods_to_install <<< "$SERVER_MODS" 
IFS="$oIFS"

for i in "${mods_to_install[@]}"; do
    get_dependencies "${i}"
done

echo "Following mods will be installed: ${calculated_dependencies[*]}"

for i in "${calculated_dependencies[@]}"; do
    echo "Installing ${i}"
    download_and_install_mod $i
done