#!/usr/bin/env bash
# RULE 0.18 — Numeric claim enforcement — block Edit/Write of numeric claims
# without evidence marker. Bypass: RULE_017_BYPASS=1 prefix (kept for compat).
#
# Reads tool-call JSON on stdin (Claude Code hook protocol).

set -euo pipefail

# Bypass check
if [[ "${RULE_017_BYPASS:-0}" = "1" ]]; then
  exit 0
fi

# Read the tool input from stdin
INPUT="$(cat)"

# Extract the new content (Edit: new_string, Write: content)
NEW_CONTENT="$(printf '%s' "$INPUT" | jq -r '.tool_input.new_string // .tool_input.content // empty' 2>/dev/null)"

if [[ -z "$NEW_CONTENT" ]]; then
  exit 0
fi

# Patterns that indicate a numeric claim
# - "~N min/hour/day/week"
# - "N MB/GB/LOC/tests/crates/atomars"
# - "~$N", "$N/mo"
# - "Nm Ns", "займёт N", "should take N"
NUMERIC_PATTERN='(~\s*[0-9]+(\.[0-9]+)?\s*(min|minute|hour|hr|day|week|month|sec|second|MB|GB|KB|LOC|line|test|crate|atomar|%|µs|ms|ns|TPS|req/s)|[0-9]+m\s*[0-9]+s|\$[0-9]+(\.[0-9]+)?(/(mo|hr|day|run))?|~\s*\$[0-9]+|should take|will take|takes about|займёт|за ~|estimated at|ETA[: ]|approximately\s+[0-9])'

# Markers that satisfy the rule
EVIDENCE_PATTERN='\[(REAL|FROM-JOURNAL|ESTIMATE-HTC)[: ]'

# Check if numeric pattern present
if ! echo "$NEW_CONTENT" | grep -iqE "$NUMERIC_PATTERN"; then
  exit 0
fi

# Numeric pattern present — check for evidence marker
if echo "$NEW_CONTENT" | grep -qE "$EVIDENCE_PATTERN"; then
  exit 0
fi

# Violation
MATCHED="$(echo "$NEW_CONTENT" | grep -iEo "$NUMERIC_PATTERN" | head -3 | tr '\n' '; ')"

cat >&2 <<EOF
═══════════════════════════════════════════════════════════════════
  RULE 0.18 — Numeric claim without evidence marker.
═══════════════════════════════════════════════════════════════════

Found in Edit/Write content:
  $MATCHED

Required: append ONE of these markers in the same paragraph:
  [REAL: <file:line | commit | timestamp>]
  [FROM-JOURNAL: ~/.claude/memory/time-metrics/<file>.jsonl#<id>]
  [ESTIMATE-HTC: <one-sentence reason this can't be measured yet>]

Or write the actual measurement to a JSONL journal first:
  echo '{"kind":"task","name":"...","duration_s":...}' \\
    >> ~/.claude/memory/time-metrics/tasks.jsonl

Then cite that line.

Bypass (visible, per-call):
  RULE_017_BYPASS=1 <command>

See: ~/.claude/rules/numeric-claims-evidence.md
═══════════════════════════════════════════════════════════════════
EOF

exit 2
