#!/bin/bash
# ═══════════════════════════════════════════════════════════════
# claude_quota_check.sh — Check Claude Code / Claude.ai quota
#
# Usage:
#   ./claude_quota_check.sh          # Human-readable output
#   ./claude_quota_check.sh --json   # Raw JSON for piping
#   ./claude_quota_check.sh --watch  # Refresh every 60s
#
# Requires: macOS with Claude Code authenticated, python3
# Token is read from macOS Keychain (same as Claude Code uses)
# ═══════════════════════════════════════════════════════════════

set -euo pipefail

# ── Extract OAuth token from macOS Keychain ──
get_token() {
  local creds
  creds=$(security find-generic-password -s "Claude Code-credentials" -w 2>/dev/null) || {
    echo "ERROR: No Claude Code credentials found in Keychain." >&2
    echo "Run 'claude' and authenticate first." >&2
    exit 1
  }

  echo "$creds" | python3 -c "
import sys, json
data = json.load(sys.stdin)
oauth = data.get('claudeAiOauth', data)
print(oauth['accessToken'])
" 2>/dev/null || {
    echo "ERROR: Could not parse credentials JSON." >&2
    exit 1
  }
}

# ── Fetch usage from Anthropic API ──
fetch_usage() {
  local token="$1"
  curl -s "https://api.anthropic.com/api/oauth/usage" \
    -H "Accept: application/json" \
    -H "Content-Type: application/json" \
    -H "User-Agent: claude-code/2.0.32" \
    -H "Authorization: Bearer ${token}" \
    -H "anthropic-beta: oauth-2025-04-20"
}

# ── Format time remaining ──
time_remaining() {
  local reset_at="$1"
  if [ -z "$reset_at" ] || [ "$reset_at" = "null" ]; then
    echo "unknown"
    return
  fi

  python3 -c "
from datetime import datetime, timezone
reset = datetime.fromisoformat('${reset_at}'.replace('Z', '+00:00'))
now = datetime.now(timezone.utc)
diff = reset - now
if diff.total_seconds() <= 0:
    print('resetting now')
else:
    hours = int(diff.total_seconds() // 3600)
    mins = int((diff.total_seconds() % 3600) // 60)
    if hours > 0:
        print(f'{hours}h {mins}m')
    else:
        print(f'{mins}m')
" 2>/dev/null || echo "unknown"
}

# ── Bar visualization ──
usage_bar() {
  local pct=$1
  local width=30
  local filled
  filled=$(python3 -c "print(int(${pct} * ${width}))")
  local empty=$((width - filled))

  # Color: green < 50%, yellow 50-80%, red > 80%
  local color=""
  if (( $(echo "$pct < 0.50" | bc -l) )); then
    color="\033[32m"  # green
  elif (( $(echo "$pct < 0.80" | bc -l) )); then
    color="\033[33m"  # yellow
  else
    color="\033[31m"  # red
  fi

  printf "${color}"
  for ((i=0; i<filled; i++)); do printf "█"; done
  printf "\033[90m"
  for ((i=0; i<empty; i++)); do printf "░"; done
  printf "\033[0m"
}

# ── Display formatted output ──
display() {
  local usage_json="$1"
  local now
  now=$(date "+%Y-%m-%d %H:%M:%S %Z")

  local five_util five_reset seven_util seven_reset
  five_util=$(echo "$usage_json" | python3 -c "import sys,json; d=json.load(sys.stdin); h=d.get('five_hour') or {}; print(h.get('utilization', 0))" 2>/dev/null || echo "0")
  five_reset=$(echo "$usage_json" | python3 -c "import sys,json; d=json.load(sys.stdin); h=d.get('five_hour') or {}; print(h.get('resets_at', 'null'))" 2>/dev/null || echo "null")
  seven_util=$(echo "$usage_json" | python3 -c "import sys,json; d=json.load(sys.stdin); h=d.get('seven_day') or {}; print(h.get('utilization', 0))" 2>/dev/null || echo "0")
  seven_reset=$(echo "$usage_json" | python3 -c "import sys,json; d=json.load(sys.stdin); h=d.get('seven_day') or {}; print(h.get('resets_at', 'null'))" 2>/dev/null || echo "null")

  local five_pct seven_pct
  five_pct=$(python3 -c "print(int(float('${five_util}') * 100))")
  seven_pct=$(python3 -c "print(int(float('${seven_util}') * 100))")

  local five_remaining seven_remaining
  five_remaining=$(time_remaining "$five_reset")
  seven_remaining=$(time_remaining "$seven_reset")

  echo ""
  echo "  ┌─────────────────────────────────────────────┐"
  echo "  │        CLAUDE QUOTA STATUS                   │"
  printf "  │        %-38s│\n" "$now"
  echo "  ├─────────────────────────────────────────────┤"
  printf "  │  5-hour window:  "
  usage_bar "$five_util"
  printf "  %3d%%  │\n" "$five_pct"
  printf "  │  Resets in: %-33s│\n" "$five_remaining"
  echo "  │                                             │"
  printf "  │  7-day window:   "
  usage_bar "$seven_util"
  printf "  %3d%%  │\n" "$seven_pct"
  printf "  │  Resets in: %-33s│\n" "$seven_remaining"
  echo "  └─────────────────────────────────────────────┘"
  echo ""

  # Decision guidance for Timmy
  if (( five_pct >= 80 )); then
    echo "  ⚠  5-hour window critical. Switch to local Qwen3-14B."
    echo "     Reserve remaining quota for high-value tasks only."
  elif (( five_pct >= 50 )); then
    echo "  ~  5-hour window half spent. Batch remaining requests."
  else
    echo "  ✓  5-hour window healthy. Full speed ahead."
  fi

  if (( seven_pct >= 80 )); then
    echo "  ⚠  Weekly quota critical! Operate in local-only mode."
  elif (( seven_pct >= 60 )); then
    echo "  ~  Weekly quota past 60%. Plan usage carefully."
  fi

  echo ""
}

# ── Main ──
main() {
  local token
  token=$(get_token)

  local usage
  usage=$(fetch_usage "$token")

  if [ -z "$usage" ] || echo "$usage" | grep -q '"error"'; then
    echo "ERROR: Failed to fetch usage data." >&2
    echo "$usage" >&2
    exit 1
  fi

  case "${1:-}" in
    --json)
      echo "$usage" | python3 -m json.tool
      ;;
    --watch)
      while true; do
        clear
        usage=$(fetch_usage "$token")
        display "$usage"
        echo "  Refreshing in 60s... (Ctrl+C to stop)"
        sleep 60
      done
      ;;
    *)
      display "$usage"
      ;;
  esac
}

main "$@"