#!/usr/bin/env bash
# gen-secrets.sh — generate all bootstrap secrets for the net-kingdom SSO/MFA platform
#
# Usage:
#   ./gen-secrets.sh [OUTPUT_DIR]
#
# Generates all pre-cluster secrets and writes them to OUTPUT_DIR (default: ./secrets).
# Output files are structured by component to mirror the KeePassXC entry layout.
#
# WARNING: The secrets/ directory must NEVER be committed to git.
#          After entering values into KeePassXC, shred the generated files:
#            find secrets/ -type f -exec shred -u {} \;
#
# PI_ENCFILE is NOT generated here — it must be produced inside the privacyIDEA
# container after deployment:
#   kubectl exec -n mfa <pi-pod> -- pi-manage create_enckey
# Extract the resulting file, store it in KeePassXC as a binary attachment on the
# privacyIDEA/PI_ENCFILE entry, then create the k8s secret from it.

set -euo pipefail

OUT_DIR="${1:-./secrets}"

if [[ -e "$OUT_DIR" ]]; then
    echo "ERROR: $OUT_DIR already exists. Delete it first or choose a different path." >&2
    exit 1
fi

# Helpers
rnd_hex()  { openssl rand -hex  "$1"; }
rnd_b64()  { openssl rand -base64 "$1" | tr -d '\n/+=' | head -c "$2"; }

mkdir -p \
    "$OUT_DIR/privacyidea" \
    "$OUT_DIR/postgres" \
    "$OUT_DIR/keycloak" \
    "$OUT_DIR/breakglass"

# ── privacyIDEA ────────────────────────────────────────────────────────────────
PI_SECRET_KEY="$(rnd_hex 32)"   # 64 hex chars — Flask/PI app secret
PI_PEPPER="$(rnd_hex 16)"       # 32 hex chars — password hashing pepper
PI_DB_PASS="$(rnd_b64 32 40)"   # 40 printable chars — DB password
PI_ADMIN_PASS="$(rnd_b64 32 40)"

cat > "$OUT_DIR/privacyidea/secrets.env" <<EOF
# privacyIDEA secrets — KeePassXC group: net-kingdom/privacyIDEA
# Entry: pi-admin          → username=pi-admin  password=PI_ADMIN_PASSWORD
# Entry: database          → username=privacyidea  password=PI_DB_PASSWORD
# Entry: SECRET_KEY        → password=PI_SECRET_KEY (no username)
# Entry: PI_PEPPER         → password=PI_PEPPER (no username)
# Entry: PI_ENCFILE        → binary attachment (generate AFTER container deploy)

PI_SECRET_KEY=$PI_SECRET_KEY
PI_PEPPER=$PI_PEPPER
PI_DB_PASSWORD=$PI_DB_PASS
PI_ADMIN_PASSWORD=$PI_ADMIN_PASS

# PI_ENCFILE: generate with:
#   kubectl exec -n mfa <pi-pod> -- pi-manage create_enckey
#   kubectl cp -n mfa <pi-pod>:/etc/privacyidea/enckey ./secrets/privacyidea/pi.enc
# Then store pi.enc as a binary attachment in KeePassXC → net-kingdom/privacyIDEA/PI_ENCFILE
EOF

# ── PostgreSQL ─────────────────────────────────────────────────────────────────
PG_ROOT_PASS="$(rnd_b64 32 40)"
PG_KC_PASS="$(rnd_b64 32 40)"
# privacyIDEA DB user reuses PI_DB_PASS (single source of truth)

cat > "$OUT_DIR/postgres/secrets.env" <<EOF
# PostgreSQL secrets — KeePassXC group: net-kingdom/PostgreSQL
# Entry: postgres root     → username=postgres  password=PG_ROOT_PASSWORD
# Entry: keycloak user     → username=keycloak  password=PG_KEYCLOAK_PASSWORD
# Entry: privacyidea user  → username=privacyidea  password=PI_DB_PASSWORD (copy from privacyIDEA entry)

PG_ROOT_PASSWORD=$PG_ROOT_PASS
PG_KEYCLOAK_PASSWORD=$PG_KC_PASS
# PI_DB_PASSWORD is in privacyidea/secrets.env — do NOT copy here; link in KeePassXC
EOF

# ── Keycloak ───────────────────────────────────────────────────────────────────
KC_ADMIN_PASS="$(rnd_b64 32 40)"
# Keycloak DB password == PG_KEYCLOAK_PASSWORD (single source of truth)

cat > "$OUT_DIR/keycloak/secrets.env" <<EOF
# Keycloak secrets — KeePassXC group: net-kingdom/Keycloak
# Entry: admin             → username=admin  password=KC_ADMIN_PASSWORD
# Entry: database          → username=keycloak  password=KC_DB_PASSWORD (copy from postgres/keycloak user)

KC_ADMIN_PASSWORD=$KC_ADMIN_PASS
KC_DB_PASSWORD=$PG_KC_PASS
EOF

# ── Break-glass ────────────────────────────────────────────────────────────────
BG_PASS="$(rnd_b64 32 40)"

cat > "$OUT_DIR/breakglass/secrets.env" <<EOF
# Break-glass secrets — KeePassXC group: net-kingdom/Break-glass
# Entry: break-glass       → username=break-glass  password=BREAKGLASS_PASSWORD
# Entry: recovery-otp      → TOTP seed (enroll manually after Keycloak is up)

BREAKGLASS_PASSWORD=$BG_PASS
EOF

# ── Summary ────────────────────────────────────────────────────────────────────
echo "=== net-kingdom SSO/MFA bootstrap secrets ==="
echo "Generated: $(date -Iseconds)"
echo "Output   : $OUT_DIR/"
echo ""
echo "  privacyIDEA:"
echo "    PI_SECRET_KEY    : $(wc -c < "$OUT_DIR/privacyidea/secrets.env" > /dev/null; echo "${PI_SECRET_KEY:0:16}…")"
echo "    PI_PEPPER        : ${PI_PEPPER:0:8}…"
echo "    PI_DB_PASSWORD   : ${PI_DB_PASS:0:8}…"
echo "    PI_ADMIN_PASSWORD: ${PI_ADMIN_PASS:0:8}…"
echo "    PI_ENCFILE       : *** generate after container deploy (see comments) ***"
echo ""
echo "  PostgreSQL:"
echo "    PG_ROOT_PASSWORD    : ${PG_ROOT_PASS:0:8}…"
echo "    PG_KEYCLOAK_PASSWORD: ${PG_KC_PASS:0:8}…"
echo "    PG_PI_PASSWORD      : (same as PI_DB_PASSWORD)"
echo ""
echo "  Keycloak:"
echo "    KC_ADMIN_PASSWORD: ${KC_ADMIN_PASS:0:8}…"
echo "    KC_DB_PASSWORD   : (same as PG_KEYCLOAK_PASSWORD)"
echo ""
echo "  Break-glass:"
echo "    BREAKGLASS_PASSWORD: ${BG_PASS:0:8}…"
echo ""
echo "Next steps:"
echo "  1. Enter each value into KeePassXC (see comments in each secrets.env file)."
echo "  2. Run pack-bundle.sh to create an age-encrypted offsite backup."
echo "  3. Shred the generated files:"
echo "       find $OUT_DIR -type f -exec shred -u {} \\;"
echo ""
echo "NEVER commit $OUT_DIR/ to git."