#!/usr/bin/env bash
# Copyright (C) 2022-2026 CachyOS team
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
set -e

declare -r MIRRORS_DEFAULT_DIR="/etc/pacman.d"

# Use https only protocol for rating
export RATE_MIRRORS_PROTOCOL=https
export RATE_MIRRORS_FETCH_MIRRORS_TIMEOUT="${RATE_MIRRORS_FETCH_MIRRORS_TIMEOUT:-30000}"
export RATE_MIRRORS_ALLOW_ROOT=true
export RATE_MIRRORS_MAX_DELAY="${RATE_MIRRORS_MAX_DELAY:-10000}"

disable_colors() {
    unset ALL_OFF BOLD BLUE GREEN RED YELLOW
}

enable_colors() {
    # prefer terminal safe colored and bold text when tput is supported
    if tput setaf 0 &>/dev/null; then
        ALL_OFF="$(tput sgr0)"
        BOLD="$(tput bold)"
        RED="${BOLD}$(tput setaf 1)"
        GREEN="${BOLD}$(tput setaf 2)"
        YELLOW="${BOLD}$(tput setaf 3)"
        BLUE="${BOLD}$(tput setaf 4)"
    else
        ALL_OFF="\e[0m"
        BOLD="\e[1m"
        RED="${BOLD}\e[31m"
        GREEN="${BOLD}\e[32m"
        YELLOW="${BOLD}\e[33m"
        BLUE="${BOLD}\e[34m"
    fi
    readonly ALL_OFF BOLD BLUE GREEN RED YELLOW
}

if [[ -t 2 ]]; then
    enable_colors
else
    disable_colors
fi

msg() {
    local mesg="$1"; shift
    printf "${GREEN}==>${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

info() {
    local mesg="$1"; shift
    printf "${YELLOW} -->${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

error() {
    local mesg="$1"; shift
    printf "${RED}==> ERROR:${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

cleanup() {
    exit "${1:-0}"
}

die() {
    (($#)) && error "$@"
    cleanup 255
}

if [ "$EUID" -ne 0 ]; then
    die "Please, run script as root"
fi

declare -r TMPFILE="$(mktemp)"
trap 'rm -f -- "$TMPFILE"' EXIT

rate_repository_mirrors() {
    local repo="$1"
    local path="$2"

    info "Ranking mirrors for ${repo} repository in ${path}..."

    if rate-mirrors --save "$TMPFILE" "$repo"; then
        if [ ! -f "${path}" ]; then
            die "${path} doesn't exist! You must install package $(pacman -Fq "$path" 2>/dev/null || echo "that contains $path")"
        fi
        install -m 0644 --backup=simple --suffix="-backup" "${TMPFILE}" "${path}"
        msg "Done [${repo}] ${path}"
    else
        die "rate-mirrors failed [errcode=$?]."
    fi
}

force_ru_mirrors() {
    local mirror domain index
    local -a ru_mirrors=(
        'https://archlinux.gay/cachy/repo/$arch/$repo'
        'https://mirror.jura12.ru/repo/$arch/$repo'
        'https://mirror.cachy-arch.ru/cachyos/repo/$arch/$repo'
        'https://wan.metrosg.ru/cachyos/repo/$arch/$repo'
    )

    local -i line=1
    for ((index=0; index < ${#ru_mirrors[@]}; index++)); do
        mirror="${ru_mirrors[$index]}"
        domain="${mirror##*://}"
        domain="${domain%%/*}"
        if curl -sL --connect-timeout 5 "https://${domain}" &>/dev/null; then
            sed -i "$((line))iServer = ${mirror}" "${MIRRORS_DEFAULT_DIR}/cachyos-mirrorlist"
            ((line++))
        else
            error "Failed to connect with ${domain} mirror"
        fi
    done
}

# Prefer mirrors that are geographically close, especially in countries that
# have regional blockages
country="RU"

if [ -n "$country" ]; then
    export RATE_MIRRORS_ENTRY_COUNTRY="$country"
fi

# China only tests its own mirrors, so disable neighbors
# and increase the number of tested mirrors to get more results
if [ "$country" = "CN" ]; then
    export RATE_MIRRORS_COUNTRY_NEIGHBORS_PER_COUNTRY=0
    export RATE_MIRRORS_COUNTRY_TEST_MIRRORS_PER_COUNTRY=50
fi

# Rate Arch Linux mirrors anyway
rate_repository_mirrors arch "${MIRRORS_DEFAULT_DIR}/mirrorlist"

# Always insert CDN77 mirror to the start, unless RU and CN region is detected
if [ "$country" != "RU" ] && [ "$country" != "CN" ]; then
    sed -i '1iServer = https://archlinux.cachyos.org/repo/$repo/os/$arch' "${MIRRORS_DEFAULT_DIR}/mirrorlist"
fi

rate_repository_mirrors cachyos "${MIRRORS_DEFAULT_DIR}/cachyos-mirrorlist"

# Always insert local mirrors as first due to blockings in RU region
#if [ "$country" = "RU" ]; then
#    force_ru_mirrors
#fi

install -m 0644 --backup=simple --suffix="-backup" "${MIRRORS_DEFAULT_DIR}/cachyos-mirrorlist" \
    "${MIRRORS_DEFAULT_DIR}/cachyos-v3-mirrorlist"
install -m 0644 --backup=simple --suffix="-backup" "${MIRRORS_DEFAULT_DIR}/cachyos-mirrorlist" \
    "${MIRRORS_DEFAULT_DIR}/cachyos-v4-mirrorlist"

sed -i 's|/$arch/|/$arch_v3/|g' "${MIRRORS_DEFAULT_DIR}/cachyos-v3-mirrorlist"
sed -i 's|/$arch/|/$arch_v4/|g' "${MIRRORS_DEFAULT_DIR}/cachyos-v4-mirrorlist"