#!/bin/sh
# Proof of Work (proof-of-work) — StartOS 0.4 container entrypoint.
#
# Responsibilities (in order):
#   1. Ensure the persistent /data directory exists.
#   2. Seed /data on truly-fresh first boot:
#      a. If /app/seed/data/app.db is present (v1.0.0:1 cutover image),
#         copy it into /data. This is how an operator migrating from
#         the legacy `workout-log` package preserves their full history.
#      b. Otherwise fall back to the empty-schema fallback DB at
#         /app/prisma/data/app.db (already seeded with the curated
#         exercise library at build time).
#      Both branches are gated on /data/app.db being absent AND
#      /data/.seeded being absent — never overwrites live data.
#   3. Run idempotent compat ALTERs for columns added after older snapshots.
#      No-ops on hosts whose schema is already current.
#   4. Ensure the curated exercise library is present for every user. New
#      maintainer-shipped exercises appear on every boot (INSERT OR IGNORE
#      keyed on (userId, name); never overwrites a user's own exercises).
#   5. Exec the Next.js standalone server as PID 1 (under dumb-init).
#
# Every branch logs to stderr so it is visible in StartOS -> Logs.

set -eu

DATA_DIR="${WORKOUT_DATA_DIR:-/data}"
DB_PATH="${WORKOUT_DB_PATH:-$DATA_DIR/app.db}"
FALLBACK_SEED_DB_PATH="${WORKOUT_FALLBACK_SEED_DB_PATH:-/app/prisma/data/app.db}"
BAKED_SEED_DB_PATH="${WORKOUT_BAKED_SEED_DB_PATH:-/app/seed/data/app.db}"
LIBRARY_JSON_PATH="${WORKOUT_LIBRARY_JSON_PATH:-/app/prisma/exercises.seed.json}"

log() {
  # write to stderr so StartOS log viewer surfaces it immediately
  printf '[entrypoint] %s\n' "$*" 1>&2
}

mkdir -p "$DATA_DIR"

# -----------------------------------------------------------------------------
# Step 1 — first-boot seeding. NEVER overwrites an existing app.db.
# Both branches are skipped on every restart of an installed host because
# /data/app.db already exists.
# -----------------------------------------------------------------------------
if [ ! -f "$DB_PATH" ] && [ ! -f "$DATA_DIR/.seeded" ]; then
  if [ -f "$BAKED_SEED_DB_PATH" ]; then
    log "no $DB_PATH and no .seeded marker; copying baked cutover seed from $BAKED_SEED_DB_PATH"
    cp "$BAKED_SEED_DB_PATH" "$DB_PATH"
    date -u +"seeded from baked cutover snapshot at %Y-%m-%dT%H:%M:%SZ" > "$DATA_DIR/.seeded"
  elif [ -f "$FALLBACK_SEED_DB_PATH" ]; then
    log "no $DB_PATH and no baked seed; copying empty-schema fallback from $FALLBACK_SEED_DB_PATH"
    cp "$FALLBACK_SEED_DB_PATH" "$DB_PATH"
    date -u +"seeded from empty-schema fallback at %Y-%m-%dT%H:%M:%SZ" > "$DATA_DIR/.seeded"
  else
    log "no $DB_PATH, no baked seed, no fallback DB; creating empty $DB_PATH"
    touch "$DB_PATH"
  fi
else
  log "$DB_PATH already present; live data is the source of truth"
  if [ -f "$DATA_DIR/.seeded" ]; then
    log "found .seeded: $(cat "$DATA_DIR/.seeded")"
  fi
fi

# -----------------------------------------------------------------------------
# Step 2 — idempotent compat ALTERs (safety net for older snapshots).
# No-ops on hosts whose schema is already current.
# -----------------------------------------------------------------------------
if command -v sqlite3 >/dev/null 2>&1 && [ -f "$DB_PATH" ]; then
  if ! sqlite3 "$DB_PATH" "PRAGMA table_info('SetLog');" 2>/dev/null | grep -q "|customMetrics|"; then
    log "adding missing column SetLog.customMetrics"
    sqlite3 "$DB_PATH" "ALTER TABLE SetLog ADD COLUMN customMetrics TEXT;"
  fi

  if ! sqlite3 "$DB_PATH" "PRAGMA table_info('Workout');" 2>/dev/null | grep -q "|deletedAt|"; then
    log "adding missing column Workout.deletedAt"
    sqlite3 "$DB_PATH" "ALTER TABLE Workout ADD COLUMN deletedAt DATETIME;"
  fi

  # Multi-user support shipped in v1.0.0:1: User.isAdmin column +
  # InstanceSettings singleton. New install: seed.ts creates both. Upgrade
  # from a snapshot pulled off the legacy `workout-log` package: this block
  # adds them in place, then promotes the oldest user to admin so the
  # in-app admin Settings panel + change-credentials action keep working.
  if ! sqlite3 "$DB_PATH" "PRAGMA table_info('User');" 2>/dev/null | grep -q "|isAdmin|"; then
    log "adding missing column User.isAdmin (default 0)"
    sqlite3 "$DB_PATH" "ALTER TABLE User ADD COLUMN isAdmin INTEGER NOT NULL DEFAULT 0;"
    log "promoting oldest user to admin (one-shot, only if no admin exists)"
    sqlite3 "$DB_PATH" \
      "UPDATE User SET isAdmin = 1 \
       WHERE id = (SELECT id FROM User ORDER BY createdAt ASC LIMIT 1) \
         AND NOT EXISTS (SELECT 1 FROM User WHERE isAdmin = 1);"
  fi

  if ! sqlite3 "$DB_PATH" "PRAGMA table_info('User');" 2>/dev/null | grep -q "|lastLoginAt|"; then
    log "adding missing column User.lastLoginAt (nullable)"
    sqlite3 "$DB_PATH" "ALTER TABLE User ADD COLUMN lastLoginAt DATETIME;"
  fi

  if ! sqlite3 "$DB_PATH" \
    "SELECT name FROM sqlite_master WHERE type='table' AND name='InstanceSettings';" \
    2>/dev/null | grep -q InstanceSettings; then
    log "creating InstanceSettings table + singleton row (signupsOpen=0)"
    sqlite3 "$DB_PATH" \
      "CREATE TABLE InstanceSettings ( \
         id INTEGER PRIMARY KEY DEFAULT 1, \
         signupsOpen INTEGER NOT NULL DEFAULT 0, \
         updatedAt DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP \
       );"
    sqlite3 "$DB_PATH" \
      "INSERT OR IGNORE INTO InstanceSettings (id, signupsOpen) VALUES (1, 0);"
  fi

  # SQLite tuning. Enabling WAL means readers don't block on a concurrent
  # writer (and vice versa) — crucial for the "background StartOS Backup
  # while users are using the app" case, which under the default rollback
  # journal can produce a torn snapshot. journal_mode persists in the DB
  # header once set, so this is effectively a one-shot. synchronous=NORMAL
  # is the safe-with-WAL balance: no fsync after every commit but still
  # crash-consistent at every checkpoint, ~10x faster than FULL.
  current_mode=$(sqlite3 "$DB_PATH" "PRAGMA journal_mode;" 2>/dev/null || echo "")
  if [ "$current_mode" != "wal" ]; then
    log "switching SQLite journal_mode from '${current_mode:-unknown}' to WAL"
    sqlite3 "$DB_PATH" "PRAGMA journal_mode=WAL;" >/dev/null
  fi
  sqlite3 "$DB_PATH" "PRAGMA synchronous=NORMAL;" >/dev/null

  # Composite indexes for hot query paths. CREATE INDEX IF NOT EXISTS is
  # idempotent — no-op if Prisma already created them via db push on a
  # fresh install. These are also declared in schema.prisma so any future
  # `prisma db push` keeps them in sync.
  log "ensuring composite indexes are present"
  sqlite3 "$DB_PATH" "
    CREATE INDEX IF NOT EXISTS Session_userId_expiresAt_idx
      ON Session(userId, expiresAt);
    CREATE INDEX IF NOT EXISTS Workout_userId_deletedAt_date_idx
      ON Workout(userId, deletedAt, date);
    CREATE INDEX IF NOT EXISTS SetLog_workoutId_setNumber_idx
      ON SetLog(workoutId, setNumber);
  " >/dev/null
fi

# -----------------------------------------------------------------------------
# Step 3 — ensure curated exercise library for every user (multi-user-aware).
# New entries shipped in /app/prisma/exercises.seed.json appear on every boot.
# `INSERT OR IGNORE` keyed on (userId, name) so we never overwrite a user's
# own custom exercises. Designed to be additive only — exercises removed from
# the curated JSON are not deleted from existing installs (users may have
# logged sets against them).
# -----------------------------------------------------------------------------
if [ -f "$LIBRARY_JSON_PATH" ] && [ -f "$DB_PATH" ]; then
  log "ensuring curated exercise library is present for every user"
  node /app/prisma/ensureExerciseLibrary.cjs \
    --db "$DB_PATH" \
    --json "$LIBRARY_JSON_PATH" \
    || log "WARNING: ensureExerciseLibrary failed; continuing boot"
else
  log "skipping library ensure (json or db not found)"
fi

# -----------------------------------------------------------------------------
# Step 4 — launch the app.
# -----------------------------------------------------------------------------
export DATABASE_URL="file:$DB_PATH"
export NODE_ENV="${NODE_ENV:-production}"
export HOSTNAME="${HOSTNAME:-0.0.0.0}"
export PORT="${PORT:-3000}"

log "launching Next.js on :${PORT} with DATABASE_URL=file:${DB_PATH}"
exec node /app/server.js
