#!/bin/bash

set -eo pipefail

GITEA_PACKAGE_ORG=${GITEA_PACKAGE_ORG}
GITEA_PACKAGE_BASE_URL=${GITEA_BASE_URL:-https://forge.cadoles.com}
GITEA_PACKAGE_USERNAME=${GITEA_PACKAGE_USERNAME}
GITEA_PACKAGE_PASSWORD=${GITEA_PACKAGE_PASSWORD}
GITEA_PACKAGE_CURL_MAX_RETRY=${GITEA_PACKAGE_CURL_MAX_RETRY:-3}

GITEA_PACKAGE_NAME_FILTER=${GITEA_PACKAGE_NAME_FILTER}
GITEA_PACKAGE_TYPE_FILTER=${GITEA_PACKAGE_TYPE_FILTER}

function check_dependencies {
    assert_command_available 'curl'
    assert_command_available 'jq'
}

function assert_command_available {
    local command=$1
    local command_path=$(which $command)

    if [ -z "$command_path" ]; then
        echo "The '$command' command could not be found. Please install it before using this script." 1>&2
        exit 1
    fi
}

function check_environment {
    assert_environment GITEA_PACKAGE_ORG
    assert_environment GITEA_PACKAGE_BASE_URL
}

function source_env_file {
    if [ ! -f '.env' ]; then
        return 0
    fi
    set -o allexport
    source .env
    set +o allexport
}

function assert_environment {
    local name=$1
    local value=${!name}

    if [ -z "$value" ]; then
        echo "The $"$name" environment variable is empty." 1>&2
        exit 1
    fi
}

function ask_credentials {
    if [ -z "$GITEA_PACKAGE_USERNAME" ]; then
        echo -n "Username: "
        read GITEA_PACKAGE_USERNAME
        
    fi
    if [ -z "$GITEA_PACKAGE_PASSWORD" ]; then
        echo -n "Password: "
        stty -echo
        read GITEA_PACKAGE_PASSWORD
        stty echo 
        echo
    fi
}

function gitea_api {
    local path=$1
    local args=${@:2}

    curl -L \
        --fail \
        --ipv4 \
        --progress-bar \
        --retry "$GITEA_PACKAGE_CURL_MAX_RETRY" \
        -u "$GITEA_PACKAGE_USERNAME:$GITEA_PACKAGE_PASSWORD" \
        $GITEA_PACKAGE_CURL_ARGS \
        ${args} \
        "$GITEA_PACKAGE_BASE_URL$path"
}

function delete_packages {
    local page=1
    local limit=10
    local next=true
    while $next; do
        local result=$(gitea_api "/api/v1/packages/$GITEA_PACKAGE_ORG?page=$page&limit=$limit" -X GET -H 'accept:application/json')
        local total_items=$(echo $result | jq -r '. | length')

        for (( i = 0; i < $total_items; i++ )); do
            local item=$(echo $result | jq --argjson index $i '.[$index]')
            local package_name=$(echo $item | jq -r '.name')
            local package_version=$(echo $item | jq -r '.version')
            local package_type=$(echo $item | jq -r '.type')

            if [ ! -z "$GITEA_PACKAGE_TYPE_FILTER" ]; then
                [[ "$package_type" =~ $GITEA_PACKAGE_TYPE_FILTER ]] || continue
            fi

            if [ ! -z "$GITEA_PACKAGE_NAME_FILTER" ]; then
                [[ "$package_name" =~ $GITEA_PACKAGE_NAME_FILTER ]] || continue
            fi

            echo "Deleting package $package_name (version: $package_version, type: $package_type)..."
            gitea_api "/api/v1/packages/$GITEA_PACKAGE_ORG/$package_type/$package_name/$package_version" -X DELETE
        done

        if [[ $total_items == 0 ]]; then
            next=false
        fi

        page=$(( $page + 1 ))
    done
}

function main {
    check_dependencies
    source_env_file
    check_environment
    ask_credentials
    delete_packages
}

main