#!/bin/sh
# pb-init.sh — idempotent PocketBase collection bootstrap
#
# Creates all collections required by libnovel. Safe to re-run: POST returns
# 400/422 when a collection already exists; both are treated as success.
#
# Required env vars (with defaults):
#   POCKETBASE_URL           http://pocketbase:8090
#   POCKETBASE_ADMIN_EMAIL   admin@libnovel.local
#   POCKETBASE_ADMIN_PASSWORD changeme123

set -e

PB_URL="${POCKETBASE_URL:-http://pocketbase:8090}"
PB_EMAIL="${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
PB_PASSWORD="${POCKETBASE_ADMIN_PASSWORD:-changeme123}"

log() { echo "[pb-init] $*"; }

# ─── 0. Ensure curl is available ─────────────────────────────────────────────
if ! command -v curl > /dev/null 2>&1; then
  apk add --no-cache curl > /dev/null 2>&1
fi

# ─── 1. Wait for PocketBase to be ready ──────────────────────────────────────
log "waiting for PocketBase at $PB_URL ..."
until curl -sf "$PB_URL/api/health" > /dev/null 2>&1; do
  sleep 2
done
log "PocketBase is up"

# ─── 2. Ensure the superuser exists, then authenticate ───────────────────────
#
# The muchobien/pocketbase image does NOT auto-create a superuser from env vars.
# On a fresh install PocketBase exposes a one-time install JWT in its log output
# at /pb_data/logs/ — but we can't read that from here.
#
# Strategy:
#   a) Try to auth normally (works on subsequent runs once the account exists).
#   b) If that returns 400/401, PocketBase is fresh. Use the install token
#      obtained from the /_/ redirect Location header (PocketBase v0.23+).

log "ensuring superuser $PB_EMAIL exists ..."

# Try to get the install token from the /_/ redirect Location header.
LOCATION=$(curl -sf -o /dev/null -w "%{redirect_url}" "$PB_URL/_/" 2>/dev/null || true)
if echo "$LOCATION" | grep -q "pbinstal/"; then
  INSTALL_TOKEN=$(echo "$LOCATION" | sed 's|.*pbinstal/||' | tr -d ' \r\n')
  log "install token found — creating superuser via install endpoint"
  curl -sf -X POST "$PB_URL/api/collections/_superusers/records" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $INSTALL_TOKEN" \
    -d "{\"email\":\"$PB_EMAIL\",\"password\":\"$PB_PASSWORD\",\"passwordConfirm\":\"$PB_PASSWORD\"}" \
    > /dev/null 2>&1 || true
  log "superuser create attempted (may already exist)"
fi

# ─── 3. Authenticate and obtain a superuser token ────────────────────────────
log "authenticating as $PB_EMAIL ..."
AUTH_RESPONSE=$(curl -sf -X POST "$PB_URL/api/collections/_superusers/auth-with-password" \
  -H "Content-Type: application/json" \
  -d "{\"identity\":\"$PB_EMAIL\",\"password\":\"$PB_PASSWORD\"}")

TOKEN=$(echo "$AUTH_RESPONSE" | sed 's/.*"token":"\([^"]*\)".*/\1/')
if [ -z "$TOKEN" ] || [ "$TOKEN" = "$AUTH_RESPONSE" ]; then
  log "ERROR: failed to obtain auth token. Response: $AUTH_RESPONSE"
  exit 1
fi
log "auth token obtained"

# ─── 4. Helpers ───────────────────────────────────────────────────────────────

create_collection() {
  NAME="$1"
  BODY="$2"
  STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
    -X POST "$PB_URL/api/collections" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" \
    -d "$BODY")
  case "$STATUS" in
    200|201) log "created collection: $NAME" ;;
    400|422) log "collection already exists (skipped): $NAME" ;;
    *)       log "WARNING: unexpected status $STATUS for collection: $NAME" ;;
  esac
}

# ensure_field COLLECTION FIELD_NAME FIELD_TYPE
#
# Checks whether FIELD_NAME exists in COLLECTION's schema.  If it is missing,
# sends a PATCH with the full current fields list plus the new field appended.
ensure_field() {
  COLL="$1"
  FIELD_NAME="$2"
  FIELD_TYPE="$3"

  SCHEMA=$(curl -sf \
    -H "Authorization: Bearer $TOKEN" \
    "$PB_URL/api/collections/$COLL" 2>/dev/null)

  # Use python3 to reliably parse the JSON schema.
  PARSED=$(echo "$SCHEMA" | python3 -c "
import sys, json
try:
    d = json.load(sys.stdin)
    fields = d.get('fields', [])
    exists = any(f.get('name') == '$FIELD_NAME' for f in fields)
    print('exists=' + str(exists))
    print('id=' + d.get('id', ''))
    if not exists:
        fields.append({'name': '$FIELD_NAME', 'type': '$FIELD_TYPE'})
        print('fields=' + json.dumps(fields))
except Exception as e:
    print('error=' + str(e))
" 2>/dev/null)

  if echo "$PARSED" | grep -q "^exists=True"; then
    log "field $COLL.$FIELD_NAME already exists — skipping"
    return
  fi

  COLLECTION_ID=$(echo "$PARSED" | grep "^id=" | sed 's/^id=//')
  if [ -z "$COLLECTION_ID" ]; then
    log "WARNING: could not get id for collection $COLL — skipping ensure_field"
    return
  fi

  NEW_FIELDS=$(echo "$PARSED" | grep "^fields=" | sed 's/^fields=//')
  PATCH_BODY="{\"fields\":${NEW_FIELDS}}"

  STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
    -X PATCH "$PB_URL/api/collections/$COLLECTION_ID" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" \
    -d "$PATCH_BODY")
  case "$STATUS" in
    200|201) log "patched $COLL — added field: $FIELD_NAME ($FIELD_TYPE)" ;;
    *)       log "WARNING: patch returned $STATUS when adding $FIELD_NAME to $COLL" ;;
  esac
}

# ─── 5. Create collections (idempotent — skips if already exist) ─────────────

create_collection "books" '{
  "name": "books",
  "type": "base",
  "fields": [
    {"name": "slug",           "type": "text",   "required": true},
    {"name": "title",          "type": "text",   "required": true},
    {"name": "author",         "type": "text"},
    {"name": "cover",          "type": "text"},
    {"name": "status",         "type": "text"},
    {"name": "genres",         "type": "json"},
    {"name": "summary",        "type": "text"},
    {"name": "total_chapters", "type": "number"},
    {"name": "source_url",     "type": "text"},
    {"name": "ranking",        "type": "number"},
    {"name": "meta_updated",   "type": "date"}
  ]
}'

create_collection "chapters_idx" '{
  "name": "chapters_idx",
  "type": "base",
  "fields": [
    {"name": "slug",       "type": "text",   "required": true},
    {"name": "number",     "type": "number", "required": true},
    {"name": "title",      "type": "text"},
    {"name": "date_label", "type": "text"}
  ]
}'

create_collection "ranking" '{
  "name": "ranking",
  "type": "base",
  "fields": [
    {"name": "rank",       "type": "number", "required": true},
    {"name": "slug",       "type": "text",   "required": true},
    {"name": "title",      "type": "text"},
    {"name": "author",     "type": "text"},
    {"name": "cover",      "type": "text"},
    {"name": "status",     "type": "text"},
    {"name": "genres",     "type": "json"},
    {"name": "source_url", "type": "text"},
    {"name": "updated",    "type": "date"}
  ]
}'

create_collection "progress" '{
  "name": "progress",
  "type": "base",
  "fields": [
    {"name": "session_id", "type": "text",   "required": true},
    {"name": "user_id",    "type": "text"},
    {"name": "slug",       "type": "text",   "required": true},
    {"name": "chapter",    "type": "number"},
    {"name": "updated",    "type": "date"}
  ]
}'

create_collection "audio_cache" '{
  "name": "audio_cache",
  "type": "base",
  "fields": [
    {"name": "cache_key", "type": "text", "required": true},
    {"name": "filename",  "type": "text"},
    {"name": "updated",   "type": "date"}
  ]
}'

create_collection "app_users" '{
  "name": "app_users",
  "type": "base",
  "fields": [
    {"name": "username",      "type": "text", "required": true},
    {"name": "password_hash", "type": "text", "required": true},
    {"name": "role",          "type": "text"},
    {"name": "created",       "type": "date"},
    {"name": "avatar_url",    "type": "text"}
  ]
}'

create_collection "user_settings" '{
  "name": "user_settings",
  "type": "base",
  "fields": [
    {"name": "session_id", "type": "text", "required": true},
    {"name": "user_id",    "type": "text"},
    {"name": "auto_next",  "type": "bool"},
    {"name": "voice",      "type": "text"},
    {"name": "speed",      "type": "number"},
    {"name": "updated",    "type": "date"}
  ]
}'

# ─── 6. Schema migrations (idempotent field additions) ───────────────────────
# Ensures fields added after initial deploy are present in existing instances.

ensure_field "progress" "user_id" "text"
ensure_field "progress" "audio_time" "number"
ensure_field "user_settings" "user_id" "text"
ensure_field "app_users" "avatar_url" "text"

create_collection "book_comments" '{
  "name": "book_comments",
  "type": "base",
  "fields": [
    {"name": "slug",       "type": "text",   "required": true},
    {"name": "user_id",    "type": "text"},
    {"name": "username",   "type": "text"},
    {"name": "body",       "type": "text",   "required": true},
    {"name": "upvotes",    "type": "number"},
    {"name": "downvotes",  "type": "number"},
    {"name": "created",    "type": "date"},
    {"name": "parent_id",  "type": "text"}
  ]
}'

create_collection "comment_votes" '{
  "name": "comment_votes",
  "type": "base",
  "fields": [
    {"name": "comment_id", "type": "text", "required": true},
    {"name": "user_id",    "type": "text"},
    {"name": "session_id", "type": "text", "required": true},
    {"name": "vote",       "type": "text", "required": true}
  ]
}'

create_collection "scraping_tasks" '{
  "name": "scraping_tasks",
  "type": "base",
  "fields": [
    {"name": "kind",             "type": "text"},
    {"name": "target_url",       "type": "text"},
    {"name": "from_chapter",     "type": "number"},
    {"name": "to_chapter",       "type": "number"},
    {"name": "worker_id",        "type": "text"},
    {"name": "status",           "type": "text",   "required": true},
    {"name": "books_found",      "type": "number"},
    {"name": "chapters_scraped", "type": "number"},
    {"name": "chapters_skipped", "type": "number"},
    {"name": "errors",           "type": "number"},
    {"name": "error_message",    "type": "text"},
    {"name": "started",          "type": "date"},
    {"name": "finished",         "type": "date"}
  ]
}'

create_collection "audio_jobs" '{
  "name": "audio_jobs",
  "type": "base",
  "fields": [
    {"name": "cache_key",     "type": "text",   "required": true},
    {"name": "slug",          "type": "text",   "required": true},
    {"name": "chapter",       "type": "number", "required": true},
    {"name": "voice",         "type": "text"},
    {"name": "worker_id",     "type": "text"},
    {"name": "status",        "type": "text",   "required": true},
    {"name": "error_message", "type": "text"},
    {"name": "started",       "type": "date"},
    {"name": "finished",      "type": "date"}
  ]
}'

create_collection "user_library" '{
  "name": "user_library",
  "type": "base",
  "fields": [
    {"name": "session_id", "type": "text", "required": true},
    {"name": "user_id",    "type": "text"},
    {"name": "slug",       "type": "text", "required": true},
    {"name": "saved_at",   "type": "date"}
  ]
}'

create_collection "user_sessions" '{
  "name": "user_sessions",
  "type": "base",
  "fields": [
    {"name": "user_id",    "type": "text", "required": true},
    {"name": "session_id", "type": "text", "required": true},
    {"name": "user_agent", "type": "text"},
    {"name": "ip",         "type": "text"},
    {"name": "created_at", "type": "date"},
    {"name": "last_seen",  "type": "date"}
  ]
}'

create_collection "user_subscriptions" '{
  "name": "user_subscriptions",
  "type": "base",
  "fields": [
    {"name": "follower_id", "type": "text", "required": true},
    {"name": "followee_id", "type": "text", "required": true},
    {"name": "created",     "type": "date"}
  ]
}'

# ─── 7. Post-initial-deploy field additions ───────────────────────────────────
# heartbeat_at is used by the backend runner to detect stale tasks.
ensure_field "scraping_tasks" "heartbeat_at" "date"
ensure_field "audio_jobs"     "heartbeat_at" "date"

log "all collections ready"