#!/usr/bin/env bash

# Author        : Allan Christensen
# First Created : 14-02-2026 (DD-MM-YYYY)
# Description   : Updates Gitea Single And Multi Instances On Ubuntu 24.04
# License       : MIT License

#
# Are we root
#
if [[ $(id -u) -ne 0 ]]; then echo "" && echo "Must be root or use sudo" && echo "" ; exit ; fi

#
# Variables
#
giteabin="/usr/local/bin/gitea"
logdir="/var/log/gitea"
logfile="$logdir/giteaupdate.log"
backupdir="/var/log/gitea"
log_date_format="+%Y-%m-%d-%H%M%S"

#
# Prepare logging
#
mkdir -p "$logdir"
touch "$logfile"
chmod 640 "$logfile"

#
# Detect interactive mode
#
if [[ -t 1 ]]; then
    interactive=true
else
    interactive=false
fi

#
# Redirect all output to logfile
#
exec >>"$logfile" 2>&1

echo ""
echo "============================================================"
echo "Gitea update run : $(date)"
echo "============================================================"

#
# Logging helper
#
log() {
    echo "$1"
    if [[ "$interactive" == true ]]; then
        echo "$1" > /dev/tty
    fi
}

#
# Check Gitea binary exists
#
if [[ ! -x "$giteabin" ]]; then
    log ""
    log "Gitea binary not found at $giteabin — aborting."
    log ""
    exit 1
fi

#
# Get installed version
#
installed_version=$("$giteabin" -v 2>/dev/null | awk '{print $3}')

if [[ -z "$installed_version" ]]; then
    log ""
    log "Could not determine installed Gitea version — aborting."
    log ""
    exit 1
fi

#
# Get latest version
#
latest_version=$(curl -fsSL https://dl.gitea.com/gitea/version.json | grep -oP '"version"\s*:\s*"\K[^"]+')

if [[ -z "$latest_version" ]]; then
    log ""
    log "Could not determine latest Gitea version — aborting."
    log ""
    exit 1
fi

#
# Compare versions
#
log ""
log "Installed version : $installed_version"
log "Latest version    : $latest_version"

if [[ "$installed_version" == "$latest_version" ]]; then
    log ""
    log "Already up to date. Nothing to do."
    log ""
    exit 0
fi

log ""
log "Updating Gitea to version $latest_version"

#
# Detect running Gitea services
#
mapfile -t running_services < <(
    systemctl list-units --type=service --state=running --no-legend |
    awk '{print $1}' | grep '^gitea'
)

#
# Download new binary
#
tmpbin="${giteabin}.new"

log ""
log "Downloading new Gitea binary..."

curl -fL "https://dl.gitea.com/gitea/${latest_version}/gitea-${latest_version}-linux-amd64" -o "$tmpbin" \
    || { log "Download failed — aborting." ; exit 1 ; }

chmod 755 "$tmpbin"

#
# Validate downloaded binary
#
log "Validating downloaded binary..."
if ! "$tmpbin" -v >/dev/null 2>&1; then
    log "Downloaded binary failed validation — aborting."
    rm -f "$tmpbin"
    exit 1
fi
log "Binary validation successful."

#
# Stop running services
#
if [[ ${#running_services[@]} -gt 0 ]]; then
    log ""
    log "Stopping running Gitea services..."
    for svc in "${running_services[@]}"; do
        log "Stopping $svc"
        systemctl stop "$svc"
    done
else
    log ""
    log "No running Gitea services detected."
fi

#
# Backup current binary
#
mkdir -p "$backupdir"
backupfile="$backupdir/giteaupdate-binary.log.$(date "$log_date_format")"
cp -p "$giteabin" "$backupfile"

log ""
log "Backup saved to: $backupfile"

#
# Replace binary
#
mv "$tmpbin" "$giteabin"
chmod 755 "$giteabin"

#
# Start services that were previously running
#
if [[ ${#running_services[@]} -gt 0 ]]; then
    log ""
    log "Starting Gitea services..."
    for svc in "${running_services[@]}"; do
        log "Starting $svc"
        systemctl start "$svc"
    done

    log ""
    log "Restarted services: ${running_services[*]}"
fi

log ""
log "Update complete."
log ""

#
# All done
#
printf "\nAll Done...\n"

#
# End of script
#