#!/bin/bash -e
################################################################################
##  File:  install.sh
##  Desc:  Helper functions for installing tools
################################################################################

download_with_retries() {
# Due to restrictions of bash functions, positional arguments are used here.
# In case if you using latest argument NAME, you should also set value to all previous parameters.
# Example: download_with_retries $ANDROID_SDK_URL "." "android_sdk.zip"
    local URL="$1"
    local DEST="${2:-.}"
    local NAME="${3:-${URL##*/}}"
    local COMPRESSED="$4"

    if [[ $COMPRESSED == "compressed" ]]; then
        local COMMAND="curl $URL -4 -sL --compressed -o '$DEST/$NAME' -w '%{http_code}'"
    else
        local COMMAND="curl $URL -4 -sL -o '$DEST/$NAME' -w '%{http_code}'"
    fi

    # Save current errexit state and disable it to prevent unexpected exit on error
    if echo $SHELLOPTS | grep '\(^\|:\)errexit\(:\|$\)' > /dev/null;
    then
        local ERR_EXIT_ENABLED=true
    else
        local ERR_EXIT_ENABLED=false
    fi
    set +e

    echo "Downloading '$URL' to '${DEST}/${NAME}'..."
    retries=20
    interval=30
    while [ $retries -gt 0 ]; do
        ((retries--))
        test "$ERR_EXIT_ENABLED" = true && set +e
        http_code=$(eval $COMMAND)
        exit_code=$?
        test "$ERR_EXIT_ENABLED" = true && set -e
        if [ $http_code -eq 200 ] && [ $exit_code -eq 0 ]; then
            echo "Download completed"
            return 0
        else
            echo "Error — Either HTTP response code for '$URL' is wrong - '$http_code' or exit code is not 0 - '$exit_code'. Waiting $interval seconds before the next attempt, $retries attempts left"
            sleep $interval
        fi
    done

    echo "Could not download $URL"
    return 1
}

## Use dpkg to figure out if a package has already been installed
## Example use:
## if ! IsPackageInstalled packageName; then
##     echo "packageName is not installed!"
## fi
IsPackageInstalled() {
    dpkg -S $1 &> /dev/null
}

verlte() {
    sortedVersion=$(printf "$1\n$2\n" | sort -V | head -n1)
    [  "$1" = "$sortedVersion" ]
}

get_toolset_path() {
    echo "/imagegeneration/installers/toolset.json"
}

get_toolset_value() {
    local toolset_path=$(get_toolset_path)
    local query=$1
    echo "$(jq -r "$query" $toolset_path)"
}

get_github_package_download_url() {
    local REPO_ORG=$1
    local FILTER=$2
    local VERSION=$3
    local SEARCH_IN_COUNT="100"

    json=$(curl -fsSL "https://api.github.com/repos/${REPO_ORG}/releases?per_page=${SEARCH_IN_COUNT}")

    if [ -n "$VERSION" ]; then
        tagName=$(echo $json | jq -r '.[] | select(.prerelease==false).tag_name' | sort --unique --version-sort | egrep -v ".*-[a-z]|beta" | egrep "\w*${VERSION}" | tail -1)
    else
        tagName=$(echo $json | jq -r '.[] | select((.prerelease==false) and (.assets | length > 0)).tag_name' | sort --unique --version-sort | egrep -v ".*-[a-z]|beta" | tail -1)
    fi

    downloadUrl=$(echo $json | jq -r ".[] | select(.tag_name==\"${tagName}\").assets[].browser_download_url | select(${FILTER})" | head -n 1)
    if [ -z "$downloadUrl" ]; then
        echo "Failed to parse a download url for the '${tagName}' tag using '${FILTER}' filter"
        exit 1
    fi
    echo $downloadUrl
}

get_github_package_hash() {
    local repo_owner=$1
    local repo_name=$2
    local file_name=$3
    local url=$4
    local version=${5:-"latest"}
    local prerelease=${6:-false}
    local delimiter=${7:-'|'}
    local word_number=${8:-2}

    if [[ -z "$file_name" ]]; then
        echo "File name is not specified."
        exit 1
    fi

    if [[ -n "$url" ]]; then
        release_url="$url"
    else
        if [ "$version" == "latest" ]; then
            release_url="https://api.github.com/repos/${repo_owner}/${repo_name}/releases/latest"
        else
            json=$(curl -fsSL "https://api.github.com/repos/${repo_owner}/${repo_name}/releases?per_page=100")
            tags=$(echo "$json" | jq -r --arg prerelease "$prerelease" '.[] | select(.prerelease == ($prerelease | test("true"; "i"))) | .tag_name')
            tag=$(echo "$tags" | grep -o "$version")
            if [[ "$(echo "$tag" | wc -l)" -gt 1 ]]; then
                echo "Multiple tags found matching the version $version. Please specify a more specific version."
                exit 1
            fi
            if [[ -z "$tag" ]]; then
                echo "Failed to get a tag name for version $version."
                exit 1
            fi
            release_url="https://api.github.com/repos/${repo_owner}/${repo_name}/releases/tags/$tag"
        fi
    fi

    body=$(curl -fsSL "$release_url" | jq -r '.body' | tr -d '`')
    matching_line=$(echo "$body" | grep "$file_name")
    if [[ "$(echo "$matching_line" | wc -l)" -gt 1 ]]; then
        echo "Multiple lines found included the file $file_name. Please specify a more specific file name."
        exit 1
    fi
    if [[ -z "$matching_line" ]]; then
        echo "File name '$file_name' not found in release body."
        exit 1
    fi

    result=$(echo "$matching_line" | cut -d "$delimiter" -f "$word_number" | tr -d -c '[:alnum:]')
    if [[ -z "$result" ]]; then
        echo "Empty result. Check parameters delimiter and/or word_number for the matching line."
        exit 1
    fi

    echo "$result"
}

get_hash_from_remote_file() {
    local url=$1
    local keywords=("$2" "$3")
    local delimiter=${4:-' '}
    local word_number=${5:-1}

    if [[ -z "${keywords[0]}" || -z "$url" ]]; then
        echo "File name and/or URL is not specified."
        exit 1
    fi

    matching_line=$(curl -fsSL "$url" | sed 's/  */ /g' | tr -d '`')
    for keyword in "${keywords[@]}"; do
        matching_line=$(echo "$matching_line" | grep "$keyword")
    done

    if [[ "$(echo "$matching_line" | wc -l)" -gt 1 ]]; then
        echo "Multiple lines found including the words: ${keywords[*]}. Please use a more specific filter."
        exit 1
    fi

    if [[ -z "$matching_line" ]]; then
        echo "Keywords (${keywords[*]}) not found in the file with hashes."
        exit 1
    fi

    result=$(echo "$matching_line" | cut -d "$delimiter" -f "$word_number" | tr -d -c '[:alnum:]')
    if [[ ${#result} -ne 64 && ${#result} -ne 128 ]]; then
        echo "Invalid result length. Expected 64 or 128 characters. Please check delimiter and/or word_number parameters."
        echo "Result: $result"
        exit 1
    fi

    echo "$result"
}

use_checksum_comparison() {
    local file_path=$1
    local checksum=$2
    local sha_type=${3:-"256"}

    echo "Performing checksum verification"

    if [[ ! -f "$file_path" ]]; then
        echo "File not found: $file_path"
        exit 1
    fi

    local_file_hash=$(shasum --algorithm "$sha_type" "$file_path" | awk '{print $1}')

    if [[ "$local_file_hash" != "$checksum" ]]; then
        echo "Checksum verification failed. Expected hash: $checksum; Actual hash: $local_file_hash."
        exit 1
    else
        echo "Checksum verification passed"
    fi
}