#!/bin/bash

# Stoat install hooks.
#
# Upstream configures an instance with an interactive generate_config.sh that
# asks for a domain and writes five files. This is the non-interactive
# equivalent, driven by the domain LibrePortal already knows and writing into
# the app's install directory.
#
# The one rule that matters here: secrets.env is generated ONCE and never
# rewritten. REVOLT__FILES__ENCRYPTION_KEY decrypts every file ever uploaded to
# the instance, so regenerating it on a reinstall would permanently orphan the
# entire media store — which is exactly the failure upstream's script warns
# about at length.

stoat_install_pre()
{
    local app_name="$1"
    if ! appInstallCheckRequirements "$app_name" "$CFG_STOAT_REQUIRES"; then
        stoat=n
        return 1
    fi
}

# The public host every generated file is derived from.
#
# Computed from the port arrays and $domain_full that variables_init_app puts in
# scope, NOT read back from the deployed compose: install_post_compose runs
# before dockerConfigSetupFileWithData, so the compose still holds raw
# placeholders at this point. port_subdomains[0] is CFG_STOAT_PORT_1 (the Caddy
# router); the empty/@/root cases mirror tagsProcessorPortSubdomains so this and
# the Traefik rule generated later cannot drift apart.
_stoatDomain()
{
    local sub="${port_subdomains[0]}"
    [[ -z "$domain_full" ]] && return 1
    if [[ "$sub" == "@" || "$sub" == "root" ]]; then
        echo "$domain_full"
    elif [[ -n "$sub" ]]; then
        echo "${sub}.${domain_full}"
    else
        echo "stoat.${domain_full}"
    fi
}

# Scheme + host the client bundle is built against, with no trailing slash.
#
# https://<host> when Traefik is installed and a domain is configured;
# otherwise http://<lan-ip>:<allocated-port>, which is a perfectly good Stoat
# instance for LAN or WireGuard use — it just cannot do camera or microphone,
# because browsers only grant those to a secure context.
#
# The port is only assigned during compose-up, so a call from
# install_post_compose returns a best guess and install_post_start corrects it.
_stoatBaseUrl()
{
    local app_name="$1"
    local compose="$containers_dir$app_name/docker-compose.yml"

    if [[ -d "${containers_dir}traefik" && -n "$domain_full" ]]; then
        local host
        host=$(_stoatDomain)
        [[ -n "$host" ]] && { echo "https://${host}"; return 0; }
    fi

    local ports external
    ports=$(tagsManagerGetTagContent "$compose" "PORTS_TAG_1")
    external="${ports%%:*}"
    if [[ -n "$external" && "$external" != PORTS_DATA* ]]; then
        echo "http://${public_ip_v4:-localhost}:${external}"
    else
        echo "http://${public_ip_v4:-localhost}"
    fi
}

# Write the three files that carry the public URL. Called once with a guess
# before the stack starts (they are bind-mounted, so they must exist or docker
# would create directories in their place) and again once the port is known.
_stoatWriteUrlFiles()
{
    local app_dir="$1" base="$2" video_enabled="$3"

    # ws:// for http, wss:// for https — a wss:// URL on a plain-HTTP origin
    # fails to connect and the client hangs on "connecting".
    local ws_scheme="wss"
    [[ "$base" == http://* ]] && ws_scheme="ws"
    local hostport="${base#*://}"

    runFileWrite "$app_dir/.env.web" <<EOF
HOSTNAME=:80
REVOLT_PUBLIC_URL=${base}/api
VITE_API_URL=${base}/api
VITE_WS_URL=${ws_scheme}://${hostport}/ws
VITE_MEDIA_URL=${base}/autumn
VITE_PROXY_URL=${base}/january
VITE_GIFBOX_URL=${base}/gifbox
VITE_CFG_ENABLE_VIDEO=${video_enabled}
EOF

    printf '{"api":"%s/api"}' "$base" | runFileWrite "$app_dir/stoat.json"

    runFileWrite "$app_dir/Revolt.toml" <<EOF
# Generated by LibrePortal at install time. Secrets live in secrets.env, not
# here. Reinstalling the app rewrites this file — put custom configuration in a
# copy and merge it back if you change anything.
[hosts]
app = "${base}"
api = "${base}/api"
events = "${ws_scheme}://${hostport}/ws"
autumn = "${base}/autumn"
january = "${base}/january"
gifbox = "${base}/gifbox"

[hosts.livekit]
worldwide = "${ws_scheme}://${hostport}/livekit"

[api.livekit.nodes.worldwide]
url = "http://livekit:7880"
lat = 0.0
lon = 0.0
EOF

    if [[ -n "$video_enabled" ]]; then
        runFileWrite -a "$app_dir/Revolt.toml" <<'EOF'

[features.limits.new_user]
video_resolution = [1920, 1080]
video_aspect_ratio = [0.3, 10]

[features.limits.default]
video_resolution = [1920, 1080]
video_aspect_ratio = [0.3, 10]
EOF
    fi
}

# Generate secrets.env if it does not already exist. Returns without touching an
# existing file — see the warning at the top.
_stoatWriteSecrets()
{
    local secrets_file="$1"

    if [[ -s "$secrets_file" ]]; then
        isNotice "Existing secrets.env found — keeping it (regenerating would orphan every uploaded file)."
        return 0
    fi

    # VAPID keypair for web push. The public key is the uncompressed EC point,
    # which is the last 65 bytes of the DER encoding, base64url-encoded without
    # padding — that is what the browser Push API expects.
    local vapid_pem vapid_private vapid_public
    vapid_pem=$(mktemp)
    openssl ecparam -name prime256v1 -genkey -noout -out "$vapid_pem" 2>/dev/null
    vapid_private=$(base64 < "$vapid_pem" | tr -d '\n' | tr -d '=')
    vapid_public=$(openssl ec -in "$vapid_pem" -outform DER 2>/dev/null | tail -c 65 | base64 | tr '/+' '_-' | tr -d '\n' | tr -d '=')
    rm -f "$vapid_pem"

    local files_key livekit_key livekit_secret
    files_key=$(openssl rand -base64 32)
    livekit_key=$(openssl rand -hex 6)
    livekit_secret=$(openssl rand -hex 24)

    runFileWrite "$secrets_file" <<EOF
# Generated by LibrePortal at install time. Treat this file as you would a
# private key: REVOLT__FILES__ENCRYPTION_KEY is the only thing that can decrypt
# the media store, and it is never regenerated once written.
REVOLT__PUSHD__VAPID__PRIVATE_KEY='${vapid_private}'
REVOLT__PUSHD__VAPID__PUBLIC_KEY='${vapid_public}'

REVOLT__FILES__ENCRYPTION_KEY='${files_key}'

REVOLT__API__LIVEKIT__NODES__WORLDWIDE__KEY='${livekit_key}'
REVOLT__API__LIVEKIT__NODES__WORLDWIDE__SECRET='${livekit_secret}'
EOF
    runFileOp chmod 600 "$secrets_file"
    isSuccessful "Generated secrets.env"
}

stoat_install_post_compose()
{
    local app_name="$1"
    local app_dir="$containers_dir$app_name"

    ((menu_number++))
    echo ""
    echo "---- $menu_number. Generating the Stoat instance configuration"
    echo ""

    local result
    result=$(createFolders "loud" "$docker_install_user" \
        "$app_dir/data/db" "$app_dir/data/rabbit" "$app_dir/data/minio" \
        "$app_dir/data/caddy-data" "$app_dir/data/caddy-config")
    checkSuccess "Creating $app_name data folders"

    _stoatWriteSecrets "$app_dir/secrets.env"

    # Read the LiveKit credentials back out — either the ones just generated or
    # the ones preserved from a previous install — because livekit.yml has to
    # carry the same pair the API is configured with.
    local livekit_key livekit_secret
    livekit_key=$(grep -oP "REVOLT__API__LIVEKIT__NODES__WORLDWIDE__KEY='\K[^']*" "$app_dir/secrets.env" 2>/dev/null)
    livekit_secret=$(grep -oP "REVOLT__API__LIVEKIT__NODES__WORLDWIDE__SECRET='\K[^']*" "$app_dir/secrets.env" 2>/dev/null)
    if [[ -z "$livekit_key" || -z "$livekit_secret" ]]; then
        isError "Could not read the LiveKit credentials from secrets.env — voice will not work."
        return 1
    fi

    local video_enabled=""
    [[ "$CFG_STOAT_ENABLE_VIDEO" != "false" ]] && video_enabled="true"

    # The port is not allocated yet, so this is a guess whenever there is no
    # domain. The files still have to exist now: they are bind-mounted, and
    # docker would silently create directories in their place otherwise.
    # stoat_install_post_start rewrites them once the real port is known.
    local base
    base=$(_stoatBaseUrl "$app_name")
    _stoatWriteUrlFiles "$app_dir" "$base" "$video_enabled"
    checkSuccess "Writing .env.web, stoat.json and Revolt.toml for $base"

    # use_external_ip lets LiveKit discover the address to advertise for WebRTC.
    # The port range matches the literal UDP mapping in the compose file; change
    # one and you must change the other.
    runFileWrite "$app_dir/livekit.yml" <<EOF
rtc:
  use_external_ip: true
  port_range_start: 50000
  port_range_end: 50100
  tcp_port: 7881

redis:
  address: redis:6379

turn:
  enabled: false

keys:
  ${livekit_key}: ${livekit_secret}

webhook:
  api_key: ${livekit_key}
  urls:
  - "http://voice-ingress:8500/worldwide"
EOF
    checkSuccess "Writing livekit.yml"

    result=$(copyResource "$app_name" "Caddyfile" "" | runInstallWrite -a "$logs_dir/$docker_log_file" 2>&1)
    checkSuccess "Copying Caddyfile to $app_dir"

    runFileOp chown -R "$docker_install_user":"$docker_install_user" "$app_dir"
    checkSuccess "Setting ownership on the $app_name install directory"
}

stoat_install_post_start()
{
    local app_name="$1"
    local app_dir="$containers_dir$app_name"

    # Ports are assigned during compose-up, so on a domain-less install the URL
    # baked in a moment ago was a guess. Correct it now and restart, but only if
    # it actually changed — restarting sixteen containers for nothing is not
    # free, and a domain-backed install guessed right the first time.
    local base current
    base=$(_stoatBaseUrl "$app_name")
    current=$(runFileOp grep -oP '^VITE_API_URL=\K.*' "$app_dir/.env.web" 2>/dev/null)
    current="${current%/api}"
    [[ "$base" == "$current" ]] && return 0

    ((menu_number++))
    echo ""
    echo "---- $menu_number. Settling the Stoat public URL"
    echo ""

    local video_enabled=""
    [[ "$CFG_STOAT_ENABLE_VIDEO" != "false" ]] && video_enabled="true"
    _stoatWriteUrlFiles "$app_dir" "$base" "$video_enabled"
    runFileOp chown -R "$docker_install_user":"$docker_install_user" "$app_dir"
    isSuccessful "Public URL settled as $base (was ${current:-unset})"

    # The web client compiles VITE_* at container start, so it has to come back
    # up before the corrected URL reaches a browser.
    dockerComposeRestart "$app_name"
}

stoat_install_post()
{
    local app_name="$1"
    local base
    base=$(_stoatBaseUrl "$app_name")

    echo ""
    isNotice "Stoat first run:"
    echo ""
    echo "      Open ${base} and create an account — the first account"
    echo "      registered on a fresh instance becomes the instance owner."
    echo ""
    if [[ "$base" == http://* ]]; then
        echo "      This install serves plain HTTP. Text chat, channels, roles and"
        echo "      uploads all work, but browsers refuse camera and microphone"
        echo "      access outside a secure context — so voice and video will not"
        echo "      work until it is served over HTTPS. A WireGuard tunnel does not"
        echo "      change that: the check is on the URL scheme, not the transport."
        echo ""
    fi
    echo "      Give it a few minutes on first boot: sixteen containers start in"
    echo "      dependency order, and the API restarts until MongoDB and RabbitMQ"
    echo "      both report healthy. 'docker compose ps' in the app directory"
    echo "      shows where it has got to."
    echo ""
    echo "      Voice falls back to TCP 7881, which is already open. For proper"
    echo "      low-latency WebRTC from outside your LAN, also allow the UDP"
    echo "      media range — LibrePortal's firewall layer only emits TCP rules,"
    echo "      so this one is manual:"
    echo ""
    echo "        sudo ufw allow 50000:50100/udp"
    echo ""
}