# Pure-bash prompt helpers — no external TUI, no dependencies.
#
# Every prompt shows its default, re-asks on invalid input, and lets Ctrl+C
# abort cleanly (the trap is installed in deploy.sh). Results are returned via
# the REPLY-style globals documented on each function.

# -- colours (disabled if not a TTY or NO_COLOR set) -----------------------
if [[ -t 1 && -z "${NO_COLOR:-}" ]]; then
    C_RESET=$'\033[0m'; C_BOLD=$'\033[1m'; C_DIM=$'\033[2m'
    C_CYAN=$'\033[36m'; C_GREEN=$'\033[32m'; C_YELLOW=$'\033[33m'; C_RED=$'\033[31m'
else
    C_RESET=''; C_BOLD=''; C_DIM=''; C_CYAN=''; C_GREEN=''; C_YELLOW=''; C_RED=''
fi

ui_title()  { printf '\n%s%s%s\n' "$C_BOLD$C_CYAN" "$1" "$C_RESET"; }
ui_info()   { printf '%s\n' "$1"; }
ui_dim()    { printf '%s%s%s\n' "$C_DIM" "$1" "$C_RESET"; }
ui_ok()     { printf '%s✓ %s%s\n' "$C_GREEN" "$1" "$C_RESET"; }
ui_warn()   { printf '%s! %s%s\n' "$C_YELLOW" "$1" "$C_RESET"; }
ui_err()    { printf '%s✗ %s%s\n' "$C_RED" "$1" "$C_RESET" >&2; }

# ui_input PROMPT DEFAULT [VALIDATOR_FN]
#   Sets UI_VALUE. VALIDATOR_FN (optional) receives the candidate value and
#   returns 0 to accept; on rejection it should print why (to stderr).
ui_input() {
    local prompt="$1" default="${2:-}" validator="${3:-}" ans
    while true; do
        if [[ -n "$default" ]]; then
            read -r -p "$prompt [${C_DIM}${default}${C_RESET}]: " ans || exit 130
            ans="${ans:-$default}"
        else
            read -r -p "$prompt: " ans || exit 130
        fi
        if [[ -n "$validator" ]]; then
            if ! "$validator" "$ans"; then continue; fi
        fi
        UI_VALUE="$ans"
        return 0
    done
}

# ui_secret PROMPT — no echo. Sets UI_VALUE.
ui_secret() {
    local prompt="$1" ans
    read -r -s -p "$prompt: " ans || exit 130
    echo
    UI_VALUE="$ans"
}

# ui_yesno PROMPT DEFAULT(yes|no) — sets UI_BOOL to "yes"/"no", returns 0/1.
ui_yesno() {
    local prompt="$1" default="${2:-yes}" ans hint
    [[ "$default" == "yes" ]] && hint="[Y/n]" || hint="[y/N]"
    while true; do
        read -r -p "$prompt $hint: " ans || exit 130
        ans="${ans:-$default}"
        case "${ans,,}" in
            y|yes|да|д) UI_BOOL="yes"; return 0 ;;
            n|no|нет|н) UI_BOOL="no";  return 1 ;;
            *) ui_warn "$(t invalid_input)" ;;
        esac
    done
}

# ui_select PROMPT  "label1" "label2" ...
#   Numbered single-choice menu. Sets UI_INDEX (1-based) and UI_VALUE (label).
ui_select() {
    local prompt="$1"; shift
    local -a opts=("$@")
    local i ans
    ui_info "$prompt"
    for i in "${!opts[@]}"; do
        printf '  %s%d%s) %s\n' "$C_CYAN" "$((i + 1))" "$C_RESET" "${opts[$i]}"
    done
    while true; do
        read -r -p "> [${C_DIM}1${C_RESET}]: " ans || exit 130
        ans="${ans:-1}"
        if [[ "$ans" =~ ^[0-9]+$ ]] && ((ans >= 1 && ans <= ${#opts[@]})); then
            UI_INDEX="$ans"
            UI_VALUE="${opts[$((ans - 1))]}"
            return 0
        fi
        ui_warn "$(t invalid_input)"
    done
}

# ui_multiselect PROMPT  "key1:label1:on" "key2:label2:off" "key3:label3:locked"
#   Toggle items by number; 'locked' items cannot be turned off. Empty line
#   confirms. Sets UI_SELECTED (space-separated keys that ended up on).
ui_multiselect() {
    local prompt="$1"; shift
    local -a keys=() labels=() states=() locks=()
    local spec key label state
    for spec in "$@"; do
        key="${spec%%:*}"; spec="${spec#*:}"
        label="${spec%%:*}"; state="${spec#*:}"
        keys+=("$key"); labels+=("$label")
        if [[ "$state" == "locked" ]]; then states+=("on"); locks+=("yes")
        else states+=("$state"); locks+=("no"); fi
    done
    local i ans
    while true; do
        ui_info "$prompt"
        for i in "${!keys[@]}"; do
            local mark="[ ]"; [[ "${states[$i]}" == "on" ]] && mark="[x]"
            local lock=""; [[ "${locks[$i]}" == "yes" ]] && lock=" ${C_DIM}(required)${C_RESET}"
            printf '  %s%d%s) %s %s%s\n' "$C_CYAN" "$((i + 1))" "$C_RESET" "$mark" "${labels[$i]}" "$lock"
        done
        ui_dim "$(t enter_to_keep) — number toggles, Enter confirms"
        read -r -p "> " ans || exit 130
        [[ -z "$ans" ]] && break
        if [[ "$ans" =~ ^[0-9]+$ ]] && ((ans >= 1 && ans <= ${#keys[@]})); then
            local idx=$((ans - 1))
            if [[ "${locks[$idx]}" == "yes" ]]; then
                ui_warn "$(t backend_required)"
            elif [[ "${states[$idx]}" == "on" ]]; then states[$idx]="off"
            else states[$idx]="on"; fi
        else
            ui_warn "$(t invalid_input)"
        fi
    done
    UI_SELECTED=""
    for i in "${!keys[@]}"; do
        [[ "${states[$i]}" == "on" ]] && UI_SELECTED+="${keys[$i]} "
    done
    UI_SELECTED="${UI_SELECTED% }"
}

# -- common validators (for ui_input) --------------------------------------
v_nonempty() { [[ -n "$1" ]] || { ui_warn "$(t invalid_input)"; return 1; }; }
v_port()     { [[ "$1" =~ ^[0-9]+$ ]] && (($1 >= 1 && $1 <= 65535)) || { ui_warn "$(t invalid_input)"; return 1; }; }
v_url()      { [[ "$1" =~ ^https?:// ]] || { ui_warn "$(t invalid_input)"; return 1; }; }
v_redis()    { [[ "$1" =~ ^rediss?:// ]] || { ui_warn "$(t invalid_input)"; return 1; }; }
v_domain()   { [[ "$1" =~ ^[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ ]] || { ui_warn "$(t invalid_input)"; return 1; }; }