#!/bin/bash
# Where do the three roots come from when nothing exported them?
#
#   scripts/dev/lp-paths-roots-test
#
# The roots reach running code three ways: the CLI wrapper exports them, the
# task-processor unit carries them as Environment=, and anything those start
# inherits them. An @reboot crontab entry is started by none of the three — it
# runs a script by absolute path — so paths.sh fell through to the
# /libreportal-* defaults.
#
# That job is crontab_boot_app_reconcile.sh, which brings every installed app up
# at boot. Pointed at the wrong root it does not fail: docker creates the
# bind-mount directories it does not find, so every app comes back EMPTY while
# the real data sits untouched on the other disk. Nothing reports an error, and
# the damage is only visible by opening an app (storage-locations §10.1).
#
# So the case that matters is the second one: no environment, relocated install.

REPO="$(cd "$(dirname "$0")/../.." && pwd)"
BASE="$(mktemp -d "${TMPDIR:-/tmp}/lp-paths-test-XXXXXX")"
trap 'rm -rf "$BASE"' EXIT

fail=0
chk(){ if [[ "$2" == "$3" ]]; then echo "  ok   $1"; else echo "  FAIL $1: got '$2' want '$3'"; fail=1; fi; }

# A stand-in for the baked task-processor unit.
cat > "$BASE/unit" <<EOF
[Service]
Environment=LP_SYSTEM_DIR=/mnt/d1/libreportal-system
Environment=LP_CONTAINERS_DIR=/mnt/d2/libreportal-containers
Environment=LP_BACKUPS_DIR=/mnt/d2/libreportal-backups
EOF

# Each case runs in its own bash so no root leaks between them.
ask() {  # ask <var> [env assignments...]
    local var="$1"; shift
    env -i PATH=/usr/bin:/bin "$@" bash -c \
        'source "$0" >/dev/null 2>&1; eval echo "\$$1"' "$REPO/scripts/source/paths.sh" "$var"
}

echo "--- no environment, unit present (the @reboot cron case) ---"
chk "system"     "$(ask LP_SYSTEM_DIR     LP_UNIT_FILE="$BASE/unit")" "/mnt/d1/libreportal-system"
chk "containers" "$(ask LP_CONTAINERS_DIR LP_UNIT_FILE="$BASE/unit")" "/mnt/d2/libreportal-containers"
chk "backups"    "$(ask LP_BACKUPS_DIR    LP_UNIT_FILE="$BASE/unit")" "/mnt/d2/libreportal-backups"
chk "derived containers_dir" \
    "$(ask containers_dir LP_UNIT_FILE="$BASE/unit")" "/mnt/d2/libreportal-containers/"
chk "derived configs_dir" \
    "$(ask configs_dir LP_UNIT_FILE="$BASE/unit")" "/mnt/d1/libreportal-system/configs/"

echo "--- an explicit environment still wins over the unit ---"
chk "containers" \
    "$(ask LP_CONTAINERS_DIR LP_UNIT_FILE="$BASE/unit" LP_CONTAINERS_DIR=/explicit)" "/explicit"

echo "--- no unit: unchanged default behaviour ---"
chk "system"     "$(ask LP_SYSTEM_DIR     LP_UNIT_FILE=/nonexistent)" "/libreportal-system"
chk "containers" "$(ask LP_CONTAINERS_DIR LP_UNIT_FILE=/nonexistent)" "/libreportal-containers"

echo "--- a unit that names only the system root ---"
printf '[Service]\nEnvironment=LP_SYSTEM_DIR=/mnt/d1/libreportal-system\n' > "$BASE/partial"
chk "system"                "$(ask LP_SYSTEM_DIR     LP_UNIT_FILE="$BASE/partial")" "/mnt/d1/libreportal-system"
chk "containers -> default" "$(ask LP_CONTAINERS_DIR LP_UNIT_FILE="$BASE/partial")" "/libreportal-containers"

echo ""
if (( fail )); then echo "FAILED"; exit 1; fi
echo "All root-resolution checks passed."