#!/usr/bin/env bash
set -Eeuo pipefail

ts() { date +"%Y-%m-%d %H:%M:%S"; }
log() { echo "[$(ts)] [INFO] $*"; }
warn(){ echo "[$(ts)] [WARN] $*" >&2; }
err() { echo "[$(ts)] [ERROR] $*" >&2; }
die() { err "$*"; exit 1; }

trap 'err "Migration failed. Showing last 200 log lines:"; docker logs --tail=200 mssql2025 2>/dev/null || true' ERR

cd "$(dirname "$0")/.."

[[ -f .env ]] || die "Missing .env. Create it first: cp .env.example .env"

set -a
# shellcheck disable=SC1091
source .env
set +a

[[ -n "${MSSQL_SA_PASSWORD:-}" ]] || die "MSSQL_SA_PASSWORD is empty in .env"

if ! docker ps --format '{{.Names}}' | grep -qx 'mssql2025'; then
  die "Container mssql2025 is not running. Start it first: ./scripts/start.sh"
fi

health="$(docker inspect -f '{{.State.Health.Status}}' mssql2025 2>/dev/null || true)"
[[ "$health" == "healthy" ]] || die "Container is not healthy (health=$health). Run ./scripts/start.sh"

# Bootstrap: ensure DevDb + migration table exists
bootstrap_sql=$(
cat <<'SQL'
IF DB_ID('DevDb') IS NULL
BEGIN
  CREATE DATABASE DevDb;
END
GO
USE DevDb;
GO
IF OBJECT_ID('dbo.__SchemaMigrations','U') IS NULL
BEGIN
  CREATE TABLE dbo.__SchemaMigrations(
    Id int IDENTITY(1,1) NOT NULL PRIMARY KEY,
    Filename nvarchar(260) NOT NULL UNIQUE,
    AppliedAt datetime2 NOT NULL CONSTRAINT DF___SchemaMigrations_AppliedAt DEFAULT (sysutcdatetime())
  );
END
GO
SQL
)

log "Ensuring DevDb + dbo.__SchemaMigrations exist..."
docker exec -i mssql2025 /opt/mssql-tools18/bin/sqlcmd \
  -S localhost -U sa -P "$MSSQL_SA_PASSWORD" \
  -b -Q "$bootstrap_sql" < /dev/null

shopt -s nullglob
files=(db/migrations/*.sql)

if (( ${#files[@]} == 0 )); then
  warn "No db/migrations/*.sql files found. Nothing to do."
  exit 0
fi

log "Applying migrations (forward-only, each file once)."
for f in "${files[@]}"; do
  bn="$(basename "$f")"
  log "-> migration candidate: $bn"

  check_sql="SET NOCOUNT ON; USE DevDb; SELECT COUNT(1) FROM dbo.__SchemaMigrations WHERE Filename = N'$bn';"
  applied="$(docker exec -i mssql2025 /opt/mssql-tools18/bin/sqlcmd \
      -S localhost -U sa -P "$MSSQL_SA_PASSWORD" -h -1 -W -Q "$check_sql" < /dev/null \
      | tr -d '\r' | tail -n 1 | xargs || true)"

  if [[ "${applied:-0}" != "0" ]]; then
    log "   (skip) already applied"
    continue
  fi

  log "   (apply) running /migrations/$bn"
  docker exec -i mssql2025 /opt/mssql-tools18/bin/sqlcmd \
    -S localhost -U sa -P "$MSSQL_SA_PASSWORD" \
    -b -i "/migrations/$bn" < /dev/null

  record_sql="USE DevDb; INSERT INTO dbo.__SchemaMigrations(Filename) VALUES (N'$bn');"
  docker exec -i mssql2025 /opt/mssql-tools18/bin/sqlcmd \
    -S localhost -U sa -P "$MSSQL_SA_PASSWORD" \
    -b -Q "$record_sql" < /dev/null

  log "   applied ✅"
done

log "Migrations completed ✅"