#!/usr/bin/env bash
# gemini-loop.sh — Parallel Gemini Code agent dispatch loop
# Runs N workers concurrently against the Gitea backlog.
# Dynamic scaling: starts at N, scales up to MAX, drops on rate limits.
#
# Usage: gemini-loop.sh [NUM_WORKERS]   (default: 3)

set -euo pipefail

export GEMINI_API_KEY="AIzaSyAmGgS516K4PwlODFEnghL535yzoLnofKM"

# === CONFIG ===
NUM_WORKERS="${1:-2}"
MAX_WORKERS=5
WORKTREE_BASE="$HOME/worktrees"
GITEA_URL="http://143.198.27.163:3000"
GITEA_TOKEN=$(cat "$HOME/.hermes/gemini_token")
GEMINI_TIMEOUT=600   # 10 min per issue
COOLDOWN=15           # seconds between issues — stagger clones
RATE_LIMIT_SLEEP=30
MAX_RATE_SLEEP=120
LOG_DIR="$HOME/.hermes/logs"
SKIP_FILE="$LOG_DIR/gemini-skip-list.json"
LOCK_DIR="$LOG_DIR/gemini-locks"
ACTIVE_FILE="$LOG_DIR/gemini-active.json"

mkdir -p "$LOG_DIR" "$WORKTREE_BASE" "$LOCK_DIR"
[ -f "$SKIP_FILE" ] || echo '{}' > "$SKIP_FILE"
echo '{}' > "$ACTIVE_FILE"

# === SHARED FUNCTIONS ===
log() {
  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >> "$LOG_DIR/gemini-loop.log"
}

lock_issue() {
  local issue_key="$1"
  local lockfile="$LOCK_DIR/$issue_key.lock"
  if mkdir "$lockfile" 2>/dev/null; then
    echo $$ > "$lockfile/pid"
    return 0
  fi
  return 1
}

unlock_issue() {
  rm -rf "$LOCK_DIR/$1.lock" 2>/dev/null
}

mark_skip() {
  local issue_num="$1" reason="$2" skip_hours="${3:-1}"
  python3 -c "
import json, time, fcntl
with open('$SKIP_FILE', 'r+') as f:
    fcntl.flock(f, fcntl.LOCK_EX)
    try: skips = json.load(f)
    except: skips = {}
    skips[str($issue_num)] = {
        'until': time.time() + ($skip_hours * 3600),
        'reason': '$reason',
        'failures': skips.get(str($issue_num), {}).get('failures', 0) + 1
    }
    if skips[str($issue_num)]['failures'] >= 3:
        skips[str($issue_num)]['until'] = time.time() + (6 * 3600)
    f.seek(0)
    f.truncate()
    json.dump(skips, f, indent=2)
" 2>/dev/null
  log "SKIP: #${issue_num} — ${reason}"
}

update_active() {
  local worker="$1" issue="$2" repo="$3" status="$4"
  python3 -c "
import json, fcntl
with open('$ACTIVE_FILE', 'r+') as f:
    fcntl.flock(f, fcntl.LOCK_EX)
    try: active = json.load(f)
    except: active = {}
    if '$status' == 'done':
        active.pop('$worker', None)
    else:
        active['$worker'] = {'issue': '$issue', 'repo': '$repo', 'status': '$status'}
    f.seek(0)
    f.truncate()
    json.dump(active, f, indent=2)
" 2>/dev/null
}

cleanup_workdir() {
  local wt="$1"
  rm -rf "$wt" 2>/dev/null || true
}

get_next_issue() {
  python3 -c "
import json, sys, time, urllib.request, os

token = '${GITEA_TOKEN}'
base = '${GITEA_URL}'
repos = [
    'Timmy_Foundation/the-nexus',
    'Timmy_Foundation/autolora',
]

try:
    with open('${SKIP_FILE}') as f: skips = json.load(f)
except: skips = {}

try:
    with open('${ACTIVE_FILE}') as f:
        active = json.load(f)
        active_issues = {v['issue'] for v in active.values()}
except:
    active_issues = set()

all_issues = []
for repo in repos:
    url = f'{base}/api/v1/repos/{repo}/issues?state=open&type=issues&limit=50&sort=created'
    req = urllib.request.Request(url, headers={'Authorization': f'token {token}'})
    try:
        resp = urllib.request.urlopen(req, timeout=10)
        issues = json.loads(resp.read())
        for i in issues:
            i['_repo'] = repo
        all_issues.extend(issues)
    except:
        continue

def priority(i):
    t = i['title'].lower()
    if '[urgent]' in t or 'urgent:' in t: return 0
    if '[p0]' in t: return 1
    if '[p1]' in t: return 2
    if '[bug]' in t: return 3
    if 'lhf:' in t or 'lhf ' in t: return 4
    if '[p2]' in t: return 5
    return 6

all_issues.sort(key=priority)

for i in all_issues:
    assignees = [a['login'] for a in (i.get('assignees') or [])]
    # Take issues assigned to gemini OR unassigned (self-assign)
    if assignees and 'gemini' not in assignees:
        continue

    title = i['title'].lower()
    if '[philosophy]' in title: continue
    if '[epic]' in title or 'epic:' in title: continue
    if '[showcase]' in title: continue

    num_str = str(i['number'])
    if num_str in active_issues: continue

    entry = skips.get(num_str, {})
    if entry and entry.get('until', 0) > time.time(): continue

    lock = '${LOCK_DIR}/' + i['_repo'].replace('/', '-') + '-' + num_str + '.lock'
    if os.path.isdir(lock): continue

    repo = i['_repo']
    owner, name = repo.split('/')

    # Self-assign if unassigned
    if not assignees:
        try:
            data = json.dumps({'assignees': ['gemini']}).encode()
            req2 = urllib.request.Request(
                f'{base}/api/v1/repos/{repo}/issues/{i["number"]}',
                data=data, method='PATCH',
                headers={'Authorization': f'token {token}', 'Content-Type': 'application/json'})
            urllib.request.urlopen(req2, timeout=5)
        except: pass

    print(json.dumps({
        'number': i['number'],
        'title': i['title'],
        'repo_owner': owner,
        'repo_name': name,
        'repo': repo,
    }))
    sys.exit(0)

print('null')
" 2>/dev/null
}

build_prompt() {
  local issue_num="$1" issue_title="$2" worktree="$3" repo_owner="$4" repo_name="$5"
  cat <<PROMPT
You are Gemini, an autonomous code agent on the ${repo_name} project.

YOUR ISSUE: #${issue_num} — "${issue_title}"

GITEA API: ${GITEA_URL}/api/v1
GITEA TOKEN: ${GITEA_TOKEN}
REPO: ${repo_owner}/${repo_name}
WORKING DIRECTORY: ${worktree}

== YOUR POWERS ==
You can do ANYTHING a developer can do.

1. READ the issue and any comments for context:
   curl -s -H "Authorization: token ${GITEA_TOKEN}" "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/issues/${issue_num}"
   curl -s -H "Authorization: token ${GITEA_TOKEN}" "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/issues/${issue_num}/comments"

2. DO THE WORK. Code, test, fix, refactor — whatever the issue needs.
   - Check for tox.ini / Makefile / package.json for test/lint commands
   - Run tests if the project has them
   - Follow existing code conventions

3. COMMIT with conventional commits: fix: / feat: / refactor: / test: / chore:
   Include "Fixes #${issue_num}" or "Refs #${issue_num}" in the message.

4. PUSH to your branch (gemini/issue-${issue_num}) and CREATE A PR:
   git push origin gemini/issue-${issue_num}
   curl -s -X POST "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/pulls" \\
     -H "Authorization: token ${GITEA_TOKEN}" \\
     -H "Content-Type: application/json" \\
     -d '{"title": "[gemini] <description> (#${issue_num})", "body": "Fixes #${issue_num}\n\n<describe what you did>", "head": "gemini/issue-${issue_num}", "base": "main"}'

5. COMMENT on the issue when done:
   curl -s -X POST "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/issues/${issue_num}/comments" \\
     -H "Authorization: token ${GITEA_TOKEN}" \\
     -H "Content-Type: application/json" \\
     -d '{"body": "PR created. <summary of changes>"}'

== RULES ==
- Read CLAUDE.md or project README first for conventions
- If the project has tox, use tox. If npm, use npm. Follow the project.
- Never use --no-verify on git commands.
- If tests fail after 2 attempts, STOP and comment on the issue explaining why.
- Be thorough but focused. Fix the issue, don't refactor the world.

== CRITICAL: ALWAYS COMMIT AND PUSH ==
- NEVER exit without committing your work. Even partial progress MUST be committed.
- Before you finish, ALWAYS: git add -A && git commit && git push origin gemini/issue-${issue_num}
- ALWAYS create a PR before exiting. No exceptions.
- If a branch already exists with prior work, check it out and CONTINUE from where it left off.
- Check: git ls-remote origin gemini/issue-${issue_num} — if it exists, pull it first.
- Your work is WASTED if it's not pushed. Push early, push often.
PROMPT
}

# === WORKER FUNCTION ===
run_worker() {
  local worker_id="$1"
  local consecutive_failures=0

  log "WORKER-${worker_id}: Started"

  while true; do
    if [ "$consecutive_failures" -ge 5 ]; then
      local backoff=$((RATE_LIMIT_SLEEP * (consecutive_failures / 5)))
      [ "$backoff" -gt "$MAX_RATE_SLEEP" ] && backoff=$MAX_RATE_SLEEP
      log "WORKER-${worker_id}: BACKOFF ${backoff}s (${consecutive_failures} failures)"
      sleep "$backoff"
      consecutive_failures=0
    fi

    issue_json=$(get_next_issue)

    if [ "$issue_json" = "null" ] || [ -z "$issue_json" ]; then
      update_active "$worker_id" "" "" "idle"
      sleep 10
      continue
    fi

    issue_num=$(echo "$issue_json" | python3 -c "import sys,json; print(json.load(sys.stdin)['number'])")
    issue_title=$(echo "$issue_json" | python3 -c "import sys,json; print(json.load(sys.stdin)['title'])")
    repo_owner=$(echo "$issue_json" | python3 -c "import sys,json; print(json.load(sys.stdin)['repo_owner'])")
    repo_name=$(echo "$issue_json" | python3 -c "import sys,json; print(json.load(sys.stdin)['repo_name'])")
    issue_key="${repo_owner}-${repo_name}-${issue_num}"
    branch="gemini/issue-${issue_num}"
    worktree="${WORKTREE_BASE}/gemini-w${worker_id}-${issue_num}"

    if ! lock_issue "$issue_key"; then
      sleep 5
      continue
    fi

    log "WORKER-${worker_id}: === ISSUE #${issue_num}: ${issue_title} (${repo_owner}/${repo_name}) ==="
    update_active "$worker_id" "$issue_num" "${repo_owner}/${repo_name}" "working"

    # Clone and pick up prior work if it exists
    rm -rf "$worktree" 2>/dev/null
    CLONE_URL="http://gemini:${GITEA_TOKEN}@143.198.27.163:3000/${repo_owner}/${repo_name}.git"
    
    if git ls-remote --heads "$CLONE_URL" "$branch" 2>/dev/null | grep -q "$branch"; then
      log "WORKER-${worker_id}: Found existing branch $branch — continuing prior work"
      if ! git clone --depth=50 -b "$branch" "$CLONE_URL" "$worktree" >/dev/null 2>&1; then
        log "WORKER-${worker_id}: ERROR cloning branch $branch for #${issue_num}"
        unlock_issue "$issue_key"
        consecutive_failures=$((consecutive_failures + 1))
        sleep "$COOLDOWN"
        continue
      fi
    else
      if ! git clone --depth=1 -b main "$CLONE_URL" "$worktree" >/dev/null 2>&1; then
        log "WORKER-${worker_id}: ERROR cloning for #${issue_num}"
        unlock_issue "$issue_key"
        consecutive_failures=$((consecutive_failures + 1))
        sleep "$COOLDOWN"
        continue
      fi
      cd "$worktree"
      git checkout -b "$branch" >/dev/null 2>&1
    fi
    cd "$worktree"

    prompt=$(build_prompt "$issue_num" "$issue_title" "$worktree" "$repo_owner" "$repo_name")

    log "WORKER-${worker_id}: Launching Gemini Code for #${issue_num}..."
    CYCLE_START=$(date +%s)

    set +e
    cd "$worktree"
    gtimeout "$GEMINI_TIMEOUT" gemini \
      -p "$prompt" \
      --yolo \
      </dev/null >> "$LOG_DIR/gemini-${issue_num}.log" 2>&1
    exit_code=$?
    set -e

    CYCLE_END=$(date +%s)
    CYCLE_DURATION=$(( CYCLE_END - CYCLE_START ))

    # ── SALVAGE: Never waste work. Commit+push whatever exists. ──
    cd "$worktree" 2>/dev/null || true
    DIRTY=$(git status --porcelain 2>/dev/null | wc -l | tr -d ' ')

    if [ "${DIRTY:-0}" -gt 0 ]; then
      log "WORKER-${worker_id}: SALVAGING $DIRTY dirty files for #${issue_num}"
      git add -A 2>/dev/null
      git commit -m "WIP: Gemini Code progress on #${issue_num}

Automated salvage commit — agent session ended (exit $exit_code).
Work in progress, may need continuation." 2>/dev/null || true
    fi

    UNPUSHED=$(git log --oneline "origin/main..HEAD" 2>/dev/null | wc -l | tr -d ' ')
    if [ "${UNPUSHED:-0}" -gt 0 ]; then
      git push -u origin "$branch" 2>/dev/null && \
        log "WORKER-${worker_id}: Pushed $UNPUSHED commit(s) on $branch" || \
        log "WORKER-${worker_id}: Push failed for $branch"
    fi

    # ── Create PR if needed ──
    pr_num=$(curl -sf "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/pulls?state=open&head=${repo_owner}:${branch}&limit=1" \
      -H "Authorization: token ${GITEA_TOKEN}" | python3 -c "
import sys,json
prs = json.load(sys.stdin)
if prs: print(prs[0]['number'])
else: print('')
" 2>/dev/null)

    if [ -z "$pr_num" ] && [ "${UNPUSHED:-0}" -gt 0 ]; then
      pr_num=$(curl -sf -X POST "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/pulls" \
        -H "Authorization: token ${GITEA_TOKEN}" \
        -H "Content-Type: application/json" \
        -d "$(python3 -c "
import json
print(json.dumps({
    'title': 'Gemini: Issue #${issue_num}',
    'head': '${branch}',
    'base': 'main',
    'body': 'Automated PR for issue #${issue_num}.\nExit code: ${exit_code}'
}))
")" | python3 -c "import sys,json; print(json.load(sys.stdin).get('number',''))" 2>/dev/null)
      [ -n "$pr_num" ] && log "WORKER-${worker_id}: Created PR #${pr_num} for issue #${issue_num}"
    fi

    # ── Merge + close on success ──
    if [ "$exit_code" -eq 0 ]; then
      log "WORKER-${worker_id}: SUCCESS #${issue_num}"
      if [ -n "$pr_num" ]; then
        curl -sf -X POST "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/pulls/${pr_num}/merge" \
          -H "Authorization: token ${GITEA_TOKEN}" \
          -H "Content-Type: application/json" \
          -d '{"Do": "squash"}' >/dev/null 2>&1 || true
        curl -sf -X PATCH "${GITEA_URL}/api/v1/repos/${repo_owner}/${repo_name}/issues/${issue_num}" \
          -H "Authorization: token ${GITEA_TOKEN}" \
          -H "Content-Type: application/json" \
          -d '{"state": "closed"}' >/dev/null 2>&1 || true
        log "WORKER-${worker_id}: PR #${pr_num} merged, issue #${issue_num} closed"
      fi
      consecutive_failures=0
    elif [ "$exit_code" -eq 124 ]; then
      log "WORKER-${worker_id}: TIMEOUT #${issue_num} (work saved in PR)"
      consecutive_failures=$((consecutive_failures + 1))
    else
      if grep -q "rate_limit\|rate limit\|429\|overloaded\|quota" "$LOG_DIR/gemini-${issue_num}.log" 2>/dev/null; then
        log "WORKER-${worker_id}: RATE LIMITED on #${issue_num} (work saved)"
        consecutive_failures=$((consecutive_failures + 3))
      else
        log "WORKER-${worker_id}: FAILED #${issue_num} exit ${exit_code} (work saved in PR)"
        consecutive_failures=$((consecutive_failures + 1))
      fi
    fi

    # ── METRICS ──
    LINES_ADDED=$(cd "$worktree" 2>/dev/null && git diff --stat origin/main..HEAD 2>/dev/null | tail -1 | grep -oE '[0-9]+ insertion' | grep -oE '[0-9]+' || echo 0)
    LINES_REMOVED=$(cd "$worktree" 2>/dev/null && git diff --stat origin/main..HEAD 2>/dev/null | tail -1 | grep -oE '[0-9]+ deletion' | grep -oE '[0-9]+' || echo 0)
    FILES_CHANGED=$(cd "$worktree" 2>/dev/null && git diff --name-only origin/main..HEAD 2>/dev/null | wc -l | tr -d ' ' || echo 0)
    
    if [ "$exit_code" -eq 0 ]; then OUTCOME="success"
    elif [ "$exit_code" -eq 124 ]; then OUTCOME="timeout"
    elif grep -q "rate_limit\|429" "$LOG_DIR/gemini-${issue_num}.log" 2>/dev/null; then OUTCOME="rate_limited"
    else OUTCOME="failed"; fi
    
    python3 -c "
import json, datetime
print(json.dumps({
    'ts': datetime.datetime.utcnow().isoformat() + 'Z',
    'agent': 'gemini',
    'worker': $worker_id,
    'issue': $issue_num,
    'repo': '${repo_owner}/${repo_name}',
    'outcome': '$OUTCOME',
    'exit_code': $exit_code,
    'duration_s': $CYCLE_DURATION,
    'files_changed': ${FILES_CHANGED:-0},
    'lines_added': ${LINES_ADDED:-0},
    'lines_removed': ${LINES_REMOVED:-0},
    'salvaged': ${DIRTY:-0},
    'pr': '${pr_num:-}',
    'merged': $( [ '$OUTCOME' = 'success' ] && [ -n '${pr_num:-}' ] && echo 'true' || echo 'false' )
}))
" >> "$LOG_DIR/claude-metrics.jsonl" 2>/dev/null

    cleanup_workdir "$worktree"
    unlock_issue "$issue_key"
    update_active "$worker_id" "" "" "done"

    sleep "$COOLDOWN"
  done
}

# === MAIN ===
log "=== Gemini Loop Started — ${NUM_WORKERS} workers (max ${MAX_WORKERS}) ==="
log "Worktrees: ${WORKTREE_BASE}"

rm -rf "$LOCK_DIR"/*.lock 2>/dev/null

# PID tracking via files (bash 3.2 compatible)
PID_DIR="$LOG_DIR/gemini-pids"
mkdir -p "$PID_DIR"
rm -f "$PID_DIR"/*.pid 2>/dev/null

launch_worker() {
  local wid="$1"
  run_worker "$wid" &
  echo $! > "$PID_DIR/${wid}.pid"
  log "Launched worker $wid (PID $!)"
}

for i in $(seq 1 "$NUM_WORKERS"); do
  launch_worker "$i"
  sleep 3
done

# Dynamic scaler — every 3 minutes
CURRENT_WORKERS="$NUM_WORKERS"
while true; do
  sleep 90

  # Reap dead workers
  for pidfile in "$PID_DIR"/*.pid; do
    [ -f "$pidfile" ] || continue
    wid=$(basename "$pidfile" .pid)
    wpid=$(cat "$pidfile")
    if ! kill -0 "$wpid" 2>/dev/null; then
      log "SCALER: Worker $wid died — relaunching"
      launch_worker "$wid"
      sleep 2
    fi
  done

  recent_rate_limits=$(tail -100 "$LOG_DIR/gemini-loop.log" 2>/dev/null | grep -c "RATE LIMITED" || true)
  recent_successes=$(tail -100 "$LOG_DIR/gemini-loop.log" 2>/dev/null | grep -c "SUCCESS" || true)

  if [ "$recent_rate_limits" -gt 0 ]; then
    if [ "$CURRENT_WORKERS" -gt 2 ]; then
      drop_to=$(( CURRENT_WORKERS / 2 ))
      [ "$drop_to" -lt 2 ] && drop_to=2
      log "SCALER: Rate limited — scaling ${CURRENT_WORKERS} → ${drop_to}"
      for wid in $(seq $((drop_to + 1)) "$CURRENT_WORKERS"); do
        if [ -f "$PID_DIR/${wid}.pid" ]; then
          kill "$(cat "$PID_DIR/${wid}.pid")" 2>/dev/null || true
          rm -f "$PID_DIR/${wid}.pid"
          update_active "$wid" "" "" "done"
        fi
      done
      CURRENT_WORKERS=$drop_to
    fi
  elif [ "$recent_successes" -ge 2 ] && [ "$CURRENT_WORKERS" -lt "$MAX_WORKERS" ]; then
    new_count=$(( CURRENT_WORKERS + 2 ))
    [ "$new_count" -gt "$MAX_WORKERS" ] && new_count=$MAX_WORKERS
    log "SCALER: Healthy — scaling ${CURRENT_WORKERS} → ${new_count}"
    for wid in $(seq $((CURRENT_WORKERS + 1)) "$new_count"); do
      launch_worker "$wid"
      sleep 2
    done
    CURRENT_WORKERS=$new_count
  fi
done