#!/usr/bin/env bash
# context-poller.sh — lightweight deltas replacing git pull.
# Polls GET /api/v1/clients/{slug}/context?since=<timestamp> every 5 min.
# Installed by bootstrap.sh via launchd (macOS) or systemd timer (Linux).
#
# Dependencies: curl, jq
set -euo pipefail

OIKOS_URL="${OIKOS_API_URL:-https://oikos.hubris.network/api/v1}"
HNAME=$(scutil --get LocalHostName 2>/dev/null || hostname -s)
CONTEXT_DIR="${HOMELAB_CONTEXT_DIR:-/opt/homelab}"
RAW_URL="${HOMELAB_RAW_URL:-https://git.hubris.network/dtoro/oikos/raw/main}"
STATE_FILE="$CONTEXT_DIR/.context_since"

SINCE=""
[ -f "$STATE_FILE" ] && SINCE=$(cat "$STATE_FILE")

API_RESP=$(curl -s --connect-timeout 10 \
    "$OIKOS_URL/clients/ws:${HNAME}/context?since=${SINCE}" 2>/dev/null || true)

if [ -z "$API_RESP" ] || ! echo "$API_RESP" | jq -e '.version' >/dev/null 2>&1; then
    exit 0
fi

NEW_SINCE=$(echo "$API_RESP" | jq -r '.since // empty')
VERSION=$(echo "$API_RESP" | jq -r '.version // 0')

CHANGED_FILES=$(echo "$API_RESP" | jq -r '.agent_files_changed // [] | .[]' 2>/dev/null || true)
SOPS_CHANGED=$(echo "$API_RESP" | jq -r '.sops_config_changed // false' 2>/dev/null || true)
TOOLS_CHANGED=$(echo "$API_RESP" | jq -r '.tools_changed // [] | .[]' 2>/dev/null || true)

APPLIED=0

# Fetch changed agent files
for f in $CHANGED_FILES; do
    url="$RAW_URL/$f"
    dest="$CONTEXT_DIR/$f"
    mkdir -p "$(dirname "$dest")"
    if curl -fsSL --connect-timeout 10 "$url" -o "$dest.tmp" 2>/dev/null; then
        mv "$dest.tmp" "$dest"
        APPLIED=$((APPLIED + 1))
    fi
done

# Fetch changed tools and re-run them
for t in $TOOLS_CHANGED; do
    url="$RAW_URL/$t"
    dest="$CONTEXT_DIR/$t"
    mkdir -p "$(dirname "$dest")"
    if curl -fsSL --connect-timeout 10 "$url" -o "$dest.tmp" 2>/dev/null; then
        mv "$dest.tmp" "$dest"
        chmod +x "$dest" 2>/dev/null || true
        if [ "$t" != "tools/post-pull.sh" ] && [ "$t" != "tools/context-poller.sh" ]; then
            bash "$dest" 2>/dev/null || true
        fi
        APPLIED=$((APPLIED + 1))
    fi
done

# Fetch .sops.yaml if changed
if [ "$SOPS_CHANGED" = "true" ]; then
    url="$RAW_URL/.sops.yaml"
    dest="$CONTEXT_DIR/.sops.yaml"
    if curl -fsSL --connect-timeout 10 "$url" -o "$dest.tmp" 2>/dev/null; then
        mv "$dest.tmp" "$dest"
        APPLIED=$((APPLIED + 1))
    fi
fi

if [ "$APPLIED" -gt 0 ] && [ -n "$NEW_SINCE" ]; then
    echo "$NEW_SINCE" > "$STATE_FILE"
    echo "[oikos] context updated: version=$VERSION, applied=$APPLIED files ($(date -u +%Y-%m-%dT%H:%M:%SZ))"
fi