#!/usr/bin/env bash
# configure.sh - Interactive first-time configuration wizard
#
# SPDX-FileCopyrightText: Daniel Pätzold
# SPDX-License-Identifier: AGPL-3.0-or-later

SCRIPTDIR="$(cd "$(dirname "$0")" && pwd)"
CONF_DIST="${SCRIPTDIR}/../config/setup_system.conf.dist"
CONF_FILE="${SCRIPTDIR}/../config.d/configure.conf"

if [[ "$EUID" -eq 0 ]]; then
    echo "ERROR: This script must not be run as root." >&2
    exit 1
fi

# Prompt for a single value; returns the old value unchanged if the user presses Enter.
prompt_value() {
    local name="$1" current="$2" new_val
    printf '  %-28s [%s]: ' "$name" "$current" >&2
    read -r new_val
    printf '%s' "${new_val:-$current}"
}

# Replace the first matching simple export line in configure.conf.
set_conf_var() {
    local varname="$1" value="$2"
    sed -i "s|^[[:space:]]*export ${varname}=.*|export ${varname}=\"${value}\"|" "$CONF_FILE"
}

# Update an existing bare "export VAR=…" line at the top level, or append one.
override_conf_var() {
    local varname="$1" value="$2"
    if grep -q "^export ${varname}=" "$CONF_FILE"; then
        sed -i "s|^export ${varname}=.*|export ${varname}=\"${value}\"|" "$CONF_FILE"
    else
        printf 'export %s="%s"\n' "$varname" "$value" >> "$CONF_FILE"
    fi
}

do_configure() {
    mkdir -p "$(dirname "$CONF_FILE")"
    cp "$CONF_DIST" "$CONF_FILE"

    # Source the dist defaults (unset computed vars first so they are re-evaluated).
    unset TLDOMAIN DOMAIN SERVERFQDN_IPA SERVERFQDN_NC CLIENTADMINGROUP \
          DECRYPTEDDATADIR ENCRYPTEDDATADIR IPAVAULTUSE IPAVAULTNAME HOSTNM FQDN
    # shellcheck disable=SC1090
    source "$CONF_FILE"

    echo ""
    echo "=== System Configuration ==="
    echo "Press Enter to keep the current value, or type a new one."
    echo ""

    new_TLDOMAIN=$(prompt_value "TLDOMAIN" "$TLDOMAIN")
    TLDOMAIN="$new_TLDOMAIN"

    DOMAIN="ipa.$TLDOMAIN}"
    new_DOMAIN=$(prompt_value "DOMAIN" "$DOMAIN")
    DOMAIN="${new_DOMAIN}"

    SERVERFQDN_IPA="ipa.${TLDOMAIN}"
    new_SERVERFQDN_IPA=$(prompt_value "SERVERFQDN_IPA" "$SERVERFQDN_IPA")
    SERVERFQDN_IPA="$new_SERVERFQDN_IPA"

    SERVERFQDN_NC="nextcloud.${TLDOMAIN}"
    new_SERVERFQDN_NC=$(prompt_value "SERVERFQDN_NC" "$SERVERFQDN_NC")
    SERVERFQDN_NC="$new_SERVERFQDN_NC"

    new_CLIENTADMINGROUP=$(prompt_value "CLIENTADMINGROUP" "$CLIENTADMINGROUP")
    CLIENTADMINGROUP="$new_CLIENTADMINGROUP"

    set_conf_var "TLDOMAIN"         "$new_TLDOMAIN"
    set_conf_var "DOMAIN"           "$DOMAIN"
    set_conf_var "SERVERFQDN_IPA"   "$new_SERVERFQDN_IPA"
    set_conf_var "SERVERFQDN_NC"    "$new_SERVERFQDN_NC"
    set_conf_var "CLIENTADMINGROUP" "$new_CLIENTADMINGROUP"

    # Re-source with the updated TLDOMAIN so DOMAIN and FQDN are recomputed correctly.
    unset DOMAIN HOSTNM FQDN
    source "$CONF_FILE"

    echo ""
    echo "Configuration written to: ${CONF_FILE}"
}

while true; do
    do_configure

    # Load setup_system.inc.sh (which re-sources configure.conf and defines all functions).
    # shellcheck disable=SC1090
    source "${SCRIPTDIR}/setup_system.inc.sh"

    echo ""
    echo "=== Testing: obtaining Nextcloud WebDAV token ==="
    while true; do
        # This makes the Token only available for this session
        unset DAVTOKENFILENAME
        get_nc_token
        current_user="$(id -un)"
        if [[ "${DAVTOKEN_USER}" == "${current_user}" ]]; then
            echo "Token obtained successfully for user '${DAVTOKEN_USER}'."
            break
        fi
        echo ""
        if [[ -z "${DAVTOKEN_USER}" ]]; then
            echo "Token could not be obtained (DAVTOKEN_USER is empty)."
        else
            echo "Token user '${DAVTOKEN_USER}' does not match current user '${current_user}'."
        fi
        read -rp "Retry get_nc_token (r) or quit (q)? [r/q]: " ans
        if [[ "${ans,,}" == "q" ]]; then
            echo "Quitting."
            exit 1
        fi
    done

    echo ""
    echo "=== Configuration complete ==="
    echo "All values have been configured and verified successfully."
    echo "The system is now ready for the new installation."
    echo "Boot from the Fedora USB installer — Anaconda will detect the OEMDRV partition"
    echo "and run the Kickstart automatically."
    exit 0
done