#!/usr/bin/env bash
# generate-env.sh — Interactively generate a .env file from a .env.example template.
# Run with -h for usage information.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# shellcheck source=lib/colors.sh
source "${SCRIPT_DIR}/lib/colors.sh"
# shellcheck source=lib/parse.sh
source "${SCRIPT_DIR}/lib/parse.sh"
# shellcheck source=lib/validate.sh
source "${SCRIPT_DIR}/lib/validate.sh"
# shellcheck source=lib/prompt.sh
source "${SCRIPT_DIR}/lib/prompt.sh"
# shellcheck source=lib/output.sh
source "${SCRIPT_DIR}/lib/output.sh"

# ---------------------------------------------------------------------------
# Defaults
# ---------------------------------------------------------------------------
INPUT_FILE=".env.example"
OUTPUT_FILE=".env"

# ---------------------------------------------------------------------------
# Argument parsing
# ---------------------------------------------------------------------------
usage() {
    cat "${SCRIPT_DIR}/HELP" >&2
    exit 0
}

while getopts ":o:h" opt; do
    case "$opt" in
        o) OUTPUT_FILE="$OPTARG" ;;
        h) usage ;;
        :) printf "${RED}Error: option -%s requires an argument.${NC}\n" "$OPTARG" >&2; exit 1 ;;
        \?) printf "${RED}Error: unknown option -%s${NC}\n" "$OPTARG" >&2; exit 1 ;;
    esac
done
shift $((OPTIND - 1))

if [[ $# -gt 0 ]]; then
    INPUT_FILE="$1"
fi

# ---------------------------------------------------------------------------
# Guard: don't silently overwrite an existing .env without confirmation
# ---------------------------------------------------------------------------
if [[ -f "$OUTPUT_FILE" ]]; then
    printf "${YELLOW}Warning: %s already exists.${NC}\n" "$OUTPUT_FILE" >&2
    read -r -p "Overwrite? [y/N]: " confirm >&2
    case "${confirm,,}" in
        y|yes) ;;
        *) printf "Aborted.\n" >&2; exit 0 ;;
    esac
fi

# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------
printf "${BOLD}generate-env${NC}  %s → %s\n" "$INPUT_FILE" "$OUTPUT_FILE" >&2
printf "${DIM}Fill in each variable. Press Enter to accept the default value.${NC}\n" >&2

parse_env_example "$INPUT_FILE"

if [[ ${#ENV_VARS[@]} -eq 0 ]]; then
    printf "${YELLOW}No variables found in %s.${NC}\n" "$INPUT_FILE" >&2
    exit 0
fi

printf "${DIM}Found %d variable(s).${NC}\n" "${#ENV_VARS[@]}" >&2

prompt_all_variables

write_env_file "$OUTPUT_FILE"