#!/usr/bin/env bash
# scripts/e2e-local.sh — launch a local ErsatzTV instance for live E2E verification.
#
# See docs/e2e-local.md for the full recipe and the "why" behind each step. This script assumes
# `dotnet build ErsatzTV.sln` and (if the SPA changed) `cd web && npm run build` have ALREADY been
# run — it only does the wwwroot copy + launch + ready-wait, since rebuilding on every invocation
# is slow and this is meant to be re-run often during a debugging session.
#
# Usage:
#   scripts/e2e-local.sh [CONFIG_DIR]
#
# CONFIG_DIR defaults to a fresh `mktemp -d` if omitted. NEVER reuse a config dir across runs.
#
# On success, prints:
#   PID=<pid>
#   PORT=<port>
#   CONFIG_DIR=<dir>
#   LOG=<log file path>
# and exits 0, leaving the server RUNNING in the background. The caller is responsible for
# stopping it (`kill <PID>`) and for freeing the port before starting another run.

set -euo pipefail

REPO_ROOT="$(git rev-parse --show-toplevel)"
BUILD_DIR="$REPO_ROOT/ErsatzTV/bin/Debug/net10.0"
PORT="${ETV_UI_PORT:-8409}"
READY_LINE="Done migrating search index"
TIMEOUT_SECS=120

CONFIG_DIR="${1:-$(mktemp -d)}"
mkdir -p "$CONFIG_DIR"

if [ ! -d "$BUILD_DIR" ]; then
  echo "error: $BUILD_DIR does not exist — run 'dotnet build ErsatzTV.sln' first" >&2
  exit 1
fi

if [ ! -d "$REPO_ROOT/ErsatzTV/wwwroot/app" ]; then
  echo "warning: $REPO_ROOT/ErsatzTV/wwwroot/app does not exist — the SPA hasn't been built" \
       "('cd web && npm run build'). The /app UI will 404 until it exists AND the server is" \
       "(re)started after copying it in." >&2
fi

echo "Copying wwwroot into build output (static middleware resolves its file root at startup;" \
     "a running process will never see files added later)..."
cp -R "$REPO_ROOT/ErsatzTV/wwwroot" "$BUILD_DIR/wwwroot"

LOG_FILE="$(mktemp)"
echo "Launching dotnet ErsatzTV.dll (log: $LOG_FILE, config: $CONFIG_DIR, port: $PORT)..."

(
  cd "$BUILD_DIR"
  ETV_CONFIG_FOLDER="$CONFIG_DIR" ETV_UI_PORT="$PORT" dotnet ErsatzTV.dll
) >"$LOG_FILE" 2>&1 &
PID=$!

echo "Waiting up to ${TIMEOUT_SECS}s for '$READY_LINE'..."
elapsed=0
until grep -q "$READY_LINE" "$LOG_FILE" 2>/dev/null; do
  if ! kill -0 "$PID" 2>/dev/null; then
    echo "error: process $PID exited before becoming ready. Log tail:" >&2
    tail -n 40 "$LOG_FILE" >&2
    exit 1
  fi

  if [ "$elapsed" -ge "$TIMEOUT_SECS" ]; then
    echo "error: timed out after ${TIMEOUT_SECS}s waiting for readiness. Log tail:" >&2
    tail -n 40 "$LOG_FILE" >&2
    kill "$PID" 2>/dev/null || true
    exit 1
  fi

  sleep 1
  elapsed=$((elapsed + 1))
done

echo "Server ready."
echo "PID=$PID"
echo "PORT=$PORT"
echo "CONFIG_DIR=$CONFIG_DIR"
echo "LOG=$LOG_FILE"