#!/usr/bin/env bash
#
# show-impact.sh — Display accumulated impact metrics from the log.
#
# Usage: ./show-impact.sh [session_id]
#   Without arguments: shows summary across all sessions.
#   With session_id: shows entries for that session only.

set -euo pipefail

PROJECT_DIR="${CLAUDE_PROJECT_DIR:-$(cd "$(dirname "$0")/../.." && pwd)}"
LOG_FILE="$PROJECT_DIR/.claude/impact/impact-log.jsonl"

if [ ! -f "$LOG_FILE" ]; then
  echo "No impact log found at $LOG_FILE"
  echo "The PreCompact hook will create it on first context compaction."
  exit 0
fi

FILTER="${1:-.}"

echo "=== Impact Log ==="
echo ""

while IFS= read -r line; do
  sid=$(echo "$line" | jq -r '.session_id')
  if ! echo "$sid" | grep -q "$FILTER"; then
    continue
  fi

  ts=$(echo "$line" | jq -r '.timestamp')
  trigger=$(echo "$line" | jq -r '.trigger')
  turns=$(echo "$line" | jq -r '.assistant_turns')
  tools=$(echo "$line" | jq -r '.tool_uses')
  source=$(echo "$line" | jq -r '.token_source // "heuristic"')
  cum_input=$(echo "$line" | jq -r '.cumulative_input_tokens')
  # Support both old field name and new field name
  output=$(echo "$line" | jq -r '.output_tokens // .estimated_output_tokens')
  cache_create=$(echo "$line" | jq -r '.cache_creation_tokens // 0')
  cache_read=$(echo "$line" | jq -r '.cache_read_tokens // 0')
  energy=$(echo "$line" | jq -r '.energy_wh')
  co2=$(echo "$line" | jq -r '.co2_g')
  cost=$(echo "$line" | jq -r '.cost_cents')

  printf "%s [%s] session=%s\n" "$ts" "$trigger" "${sid:0:12}..."
  printf "  Turns: %s  Tool uses: %s  Token source: %s\n" "$turns" "$tools" "$source"
  printf "  Input tokens (cache-weighted): %s  Output tokens: %s\n" "$cum_input" "$output"
  if [ "$cache_create" != "0" ] || [ "$cache_read" != "0" ]; then
    printf "  Cache: %s created, %s read\n" "$cache_create" "$cache_read"
  fi
  LC_NUMERIC=C printf "  Energy: ~%s Wh  CO2: ~%sg  Cost: ~\$%.2f\n" "$energy" "$co2" "$(echo "$cost / 100" | bc -l 2>/dev/null || echo "$cost cents")"

  # Social cost proxies (if present in log entry)
  model=$(echo "$line" | jq -r '.model_id // empty')
  auto_pm=$(echo "$line" | jq -r '.automation_ratio_pm // empty')
  user_tok=$(echo "$line" | jq -r '.user_tokens_est // empty')
  files_ed=$(echo "$line" | jq -r '.unique_files_edited // empty')
  total_ed=$(echo "$line" | jq -r '.total_file_edits // empty')
  t_pass=$(echo "$line" | jq -r '.test_passes // empty')
  t_fail=$(echo "$line" | jq -r '.test_failures // empty')
  pub_push=$(echo "$line" | jq -r '.has_public_push // empty')

  if [ -n "$model" ]; then
    printf "  Model: %s\n" "$model"
  fi
  if [ -n "$auto_pm" ] && [ "$auto_pm" != "0" ]; then
    auto_pct=$(( auto_pm / 10 ))
    auto_dec=$(( auto_pm % 10 ))
    printf "  Automation ratio: %d.%d%%  (user ~%s tokens, AI ~%s tokens)\n" \
      "$auto_pct" "$auto_dec" "$user_tok" "$output"
  fi
  if [ -n "$files_ed" ] && [ "$files_ed" != "0" ]; then
    printf "  File churn: %s edits across %s files\n" "$total_ed" "$files_ed"
  fi
  if [ -n "$t_pass" ] && [ -n "$t_fail" ] && { [ "$t_pass" != "0" ] || [ "$t_fail" != "0" ]; }; then
    printf "  Tests: %s passed, %s failed\n" "$t_pass" "$t_fail"
  fi
  if [ "$pub_push" = "1" ]; then
    printf "  Public push: yes (data pollution risk)\n"
  fi
  echo ""
done < "$LOG_FILE"

# Totals
TOTAL_ENERGY=$(jq -s '[.[].energy_wh] | add' "$LOG_FILE")
TOTAL_CO2=$(jq -s '[.[].co2_g] | add' "$LOG_FILE")
TOTAL_COST=$(jq -s '[.[].cost_cents] | add' "$LOG_FILE")
TOTAL_ENTRIES=$(wc -l < "$LOG_FILE")

echo "=== Totals ($TOTAL_ENTRIES snapshots) ==="
LC_NUMERIC=C printf "  Energy: ~%s Wh  CO2: ~%sg  Cost: ~\$%.2f\n" \
  "$TOTAL_ENERGY" "$TOTAL_CO2" \
  "$(echo "$TOTAL_COST / 100" | bc -l 2>/dev/null || echo "$TOTAL_COST cents")"

# Show annotations if they exist
ANNOT_FILE="$PROJECT_DIR/.claude/impact/annotations.jsonl"
if [ -f "$ANNOT_FILE" ] && [ -s "$ANNOT_FILE" ]; then
  echo ""
  echo "=== Value Annotations ==="
  echo ""
  while IFS= read -r line; do
    sid=$(echo "$line" | jq -r '.session_id')
    if ! echo "$sid" | grep -q "$FILTER"; then
      continue
    fi
    ts=$(echo "$line" | jq -r '.timestamp')
    summary=$(echo "$line" | jq -r '.value_summary')
    reach=$(echo "$line" | jq -r '.estimated_reach')
    cf=$(echo "$line" | jq -r '.counterfactual')
    net=$(echo "$line" | jq -r '.net_assessment')
    printf "%s session=%s\n" "$ts" "${sid:0:12}..."
    printf "  Value: %s\n" "$summary"
    printf "  Reach: %s  Counterfactual: %s  Net: %s\n" "$reach" "$cf" "$net"
    echo ""
  done < "$ANNOT_FILE"
fi