#!/usr/bin/env bash
# sleep-report-tg.sh — Phase B → Telegram delivery hook.
#
# Runs as the FINAL step of phase-b-rem.sh after the report is committed +
# pushed to the memory-repo. Spawns a cloud Claude agent to read the report
# + tracking digests + cross-session analyze, distil 3-5 actionable
# findings, then sends to the whitelisted chat_id via @KeiSeiBot.
#
# Defensive: never blocks Phase B exit code. Failures land in
# ~/.claude/memory/sleep-report-tg-errors.log and exit 0.
#
# Required env (RULE 0.8 — secrets in ~/.claude/secrets/.env):
#   TELEGRAM_BOT_TOKEN          — @KeiSeiBot
#   TELEGRAM_ALLOWED_CHAT_ID    — 86059912 (Parfionovich, single-user whitelist)
#   ANTHROPIC_API_KEY           — for the reasoning step
#
# Bypass: SLEEP_REPORT_TG_BYPASS=1 ...
#
# Usage (called from phase-b-rem.sh after `git push`):
#   ~/.claude/hooks/sleep-report-tg.sh "$REPORT" "$TODAY"
#     $1 = path to reports/sleep-YYYY-MM-DD.md (required)
#     $2 = TODAY date string (required, YYYY-MM-DD)

set -u

ERR_LOG="${HOME}/.claude/memory/sleep-report-tg-errors.log"

log_err() {
    mkdir -p "$(dirname "$ERR_LOG")" 2>/dev/null || return 0
    printf '[%s] %s\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$*" >> "$ERR_LOG" 2>/dev/null || true
}

[ "${SLEEP_REPORT_TG_BYPASS:-0}" = "1" ] && exit 0

REPORT="${1:-}"
TODAY="${2:-$(date +%Y-%m-%d)}"
[ -f "$REPORT" ] || { log_err "report not found: $REPORT"; exit 0; }

# Source secrets if env vars not already set.
SECRETS_FILE="${HOME}/.claude/secrets/.env"
if [ -f "$SECRETS_FILE" ] && [ -z "${TELEGRAM_BOT_TOKEN:-}" ]; then
    set -a
    # shellcheck disable=SC1090
    . "$SECRETS_FILE" 2>/dev/null || true
    set +a
fi

[ -n "${TELEGRAM_BOT_TOKEN:-}" ] || { log_err "TELEGRAM_BOT_TOKEN unset"; exit 0; }
CHAT_ID="${TELEGRAM_ALLOWED_CHAT_ID:-86059912}"

command -v curl >/dev/null 2>&1 || { log_err "curl missing"; exit 0; }
command -v jq >/dev/null 2>&1 || { log_err "jq missing"; exit 0; }

# ---- Cloud-agent reasoning step -------------------------------------------
# Send the report to Claude API for distillation. Keep it cheap with Sonnet
# 4.6 — the task is summary, not generation. Caps + max_tokens prevent
# runaway cost on a malformed report.
TG_AGENT_LOG="${HOME}/.claude/memory/sleep-report-tg-agent.log"

if [ -z "${ANTHROPIC_API_KEY:-}" ]; then
    log_err "ANTHROPIC_API_KEY unset — sending raw report excerpt"
    SUMMARY=$(head -c 3500 "$REPORT")
else
    REPORT_BODY=$(cat "$REPORT")
    PROMPT_BODY=$(jq -n --arg r "$REPORT_BODY" '
{
  "model": "claude-sonnet-4-6",
  "max_tokens": 600,
  "system": "Distil the input report into a Telegram brief. Be ruthlessly compressed. Token budget is hard.\n\nFormat (≤900 chars TOTAL — fail closed at the budget, do not exceed):\n  Line 1: 💤 <ONE sentence — the single fact that matters>\n  Then 3 bullets max, each ≤120 chars: <data point + action>\n  Optional final line `escalate: <pattern>` ONLY if a cross-session pattern appeared ≥5×.\n\nRules:\n- No headers, no section labels, no separators (---), no preamble, no greetings, no closing line.\n- Every claim must reference data from the report. No invented findings.\n- If two findings overlap, merge — never repeat the same metric in two bullets.\n- Numbers go bare with units. Do NOT explain what the metric means.\n- No Markdown beyond *bold* and `code`. No emoji beyond the 💤 prefix.",
  "messages": [{"role":"user","content":[{"type":"text","text":$r}]}]
}')

    RESP=$(curl -sS -X POST "https://api.anthropic.com/v1/messages" \
        -H "Content-Type: application/json" \
        -H "x-api-key: $ANTHROPIC_API_KEY" \
        -H "anthropic-version: 2023-06-01" \
        --max-time 120 \
        -d "$PROMPT_BODY" 2>/dev/null)

    printf '[%s]\n%s\n---\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$RESP" >> "$TG_AGENT_LOG"

    SUMMARY=$(printf '%s' "$RESP" | jq -r '.content[0].text // empty' 2>/dev/null)
    if [ -z "$SUMMARY" ]; then
        ERR=$(printf '%s' "$RESP" | jq -r '.error.message // "unknown"' 2>/dev/null)
        log_err "claude api returned no text (error: $ERR) — falling back to raw excerpt"
        SUMMARY=$(head -c 3500 "$REPORT")
    fi
fi

# ---- Telegram send --------------------------------------------------------
# Telegram message limit is 4096 chars. We cap at 3900 to leave room for
# the prefix + headers. If the cloud agent went over budget, hard-truncate
# rather than splitting (one cohesive message > two fragmented).
# No external header — the agent emits its own 💤 line. Cap at 950 chars
# to enforce the budget; if the agent went over, hard-truncate.
BODY=$(printf '%s' "$SUMMARY" | head -c 950)

# Use --data-urlencode for safe transport of newlines / specials.
HTTP_RESP=$(curl -sS -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
    --max-time 30 \
    --data-urlencode "chat_id=${CHAT_ID}" \
    --data-urlencode "parse_mode=Markdown" \
    --data-urlencode "text=${BODY}" 2>/dev/null)

OK=$(printf '%s' "$HTTP_RESP" | jq -r '.ok' 2>/dev/null)
if [ "$OK" = "true" ]; then
    MSG_ID=$(printf '%s' "$HTTP_RESP" | jq -r '.result.message_id' 2>/dev/null)
    log_err "INFO sent to chat=${CHAT_ID} msg_id=${MSG_ID} report=${TODAY}"
else
    DESC=$(printf '%s' "$HTTP_RESP" | jq -r '.description' 2>/dev/null)
    log_err "send failed: $DESC"

    # Markdown parse errors are a known failure mode (orphan * / [) — retry
    # without parse_mode so the user at least sees the report verbatim.
    if printf '%s' "$DESC" | grep -qi "parse"; then
        curl -sS -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
            --max-time 30 \
            --data-urlencode "chat_id=${CHAT_ID}" \
            --data-urlencode "text=${BODY}" >/dev/null 2>&1 || true
    fi
fi

exit 0