#!/usr/bin/env bash
# Unit tests for the pure functions in fan-control.sh (the thin actuator).
# The control math lives in Home Assistant now; the daemon only validates and
# applies the HA-computed command, so these cover the I/O-adjacent pure helpers.
# Run: bash infra/scripts/test-fan-control.sh

set -uo pipefail
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=/dev/null
source "$DIR/fan-control.sh"

pass=0 fail=0
eq() {  # <description> <expected> <actual>
  if [[ "$2" == "$3" ]]; then pass=$((pass + 1)); else
    fail=$((fail + 1)); printf 'FAIL: %s — expected [%s] got [%s]\n' "$1" "$2" "$3"
  fi
}
ok() {  # <description> <cmd...>  (passes if cmd exits 0)
  if "${@:2}"; then pass=$((pass + 1)); else fail=$((fail + 1)); printf 'FAIL: %s — expected exit 0\n' "$1"; fi
}
no() {  # <description> <cmd...>  (passes if cmd exits non-zero)
  if "${@:2}"; then fail=$((fail + 1)); printf 'FAIL: %s — expected non-zero exit\n' "$1"; else pass=$((pass + 1)); fi
}

# --- fc_num: sanitise the HA command read (truncate floats, fallback, clamp) ---
eq "num valid"        55 "$(fc_num 55 0 0 100)"
eq "num float trunc"  55 "$(fc_num 55.7 0 0 100)"
eq "num empty->fb"     0 "$(fc_num '' 0 0 100)"
eq "num garbage->fb"   0 "$(fc_num abc 0 0 100)"
eq "num clamp low"     0 "$(fc_num -5 0 0 100)"
eq "num clamp high"  100 "$(fc_num 150 0 0 100)"

# --- fc_fresh: staleness gate on the command's last_updated age ---
ok "fresh well within"   fc_fresh 30 120
ok "fresh at boundary"   fc_fresh 120 120
no "stale just past"     fc_fresh 121 120
no "stale way past"      fc_fresh 600 120

# --- fc_clamp ---
eq "clamp over 100"   100 "$(fc_clamp 150)"
eq "clamp under 0"      0 "$(fc_clamp -5)"
eq "clamp passthrough" 45 "$(fc_clamp 45)"

# --- fc_fan_watts: estimated fan power from RPM (cube-law, calibrated to the sweep) ---
eq "fan_watts 0"     0  "$(fc_fan_watts 0)"
eq "fan_watts 4800"  2  "$(fc_fan_watts 4800)"
eq "fan_watts 9360"  16 "$(fc_fan_watts 9360)"
eq "fan_watts 12720" 42 "$(fc_fan_watts 12720)"
eq "fan_watts 16920" 99 "$(fc_fan_watts 16920)"

# --- temp parsing ---
eq "parse temp line" 74 "$(fc_parse_temp 'Temp             | 0Eh | ok  |  3.1 | 74 degrees C')"
eq "parse temp 7C"   72 "$(fc_parse_temp 'Temp             | 0Eh | ok  |  3.1 | 72 degrees C')"

# --- json field (jq-free): state + last_updated parsing for the command read ---
J='{"entity_id":"sensor.r730_fan_command_pct","state":"57","attributes":{"unit_of_measurement":"%"},"last_changed":"2026-06-08T16:55:20.517745+00:00","last_updated":"2026-06-08T16:55:25.000000+00:00"}'
eq "json state"        "57"                                "$(fc_json_str_field "$J" state)"
eq "json last_updated" "2026-06-08T16:55:25.000000+00:00"  "$(fc_json_str_field "$J" last_updated)"

# --- hex conversion ---
eq "hex 20"  0x14 "$(fc_pct_to_hex 20)"
eq "hex 45"  0x2d "$(fc_pct_to_hex 45)"
eq "hex 100" 0x64 "$(fc_pct_to_hex 100)"
eq "hex 5"   0x05 "$(fc_pct_to_hex 5)"

printf '\n%d passed, %d failed\n' "$pass" "$fail"
(( fail == 0 ))