#!/bin/bash
# Load Test Script for Build Streaming
# Simulates concurrent builds with SSE clients to verify event delivery
#
# Usage:
#   ./scripts/load-test-builds.sh [num_concurrent] [duration_seconds]
#
# Example:
#   ./scripts/load-test-builds.sh 10 60    # 10 concurrent streams for 60 seconds

set -euo pipefail

# Configuration
API_URL="${RDEV_API_URL:-https://rdev.masq-ops.orchard9.ai}"
API_KEY="${RDEV_API_KEY:?RDEV_API_KEY environment variable required}"

NUM_CONCURRENT="${1:-5}"
DURATION="${2:-30}"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'

log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[OK]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }

# Track metrics
EVENTS_RECEIVED=0
CONNECTIONS_OPENED=0
CONNECTIONS_FAILED=0
STREAM_PIDS=()

# Cleanup on exit
cleanup() {
    log_info "Cleaning up..."
    for pid in "${STREAM_PIDS[@]}"; do
        kill "$pid" 2>/dev/null || true
    done
}
trap cleanup EXIT

# Simulate an SSE client that counts events
run_sse_client() {
    local client_id="$1"
    local stream_id="load-test-stream-$client_id"
    local events_file="/tmp/load-test-events-$client_id.txt"

    echo "0" > "$events_file"

    # Connect and count events
    curl -s -N \
        -H "X-API-Key: ${API_KEY}" \
        -H "Accept: text/event-stream" \
        "${API_URL}/projects/load-test-project/events?stream_id=${stream_id}" 2>/dev/null | \
    while IFS= read -r line; do
        if [[ "$line" == "data:"* ]]; then
            # Increment event count
            count=$(<"$events_file")
            echo "$((count + 1))" > "$events_file"
        fi
    done &

    echo $!
}

# Publish events to simulate build activity
publish_events() {
    local num_events="$1"
    local stream_id="$2"

    for i in $(seq 1 "$num_events"); do
        # Use curl to trigger some activity (this is a simulation)
        # In real usage, events come from BuildExecutor
        sleep 0.1
    done
}

echo ""
echo "=========================================="
echo "  Build Streaming Load Test"
echo "=========================================="
echo ""
echo "  Concurrent clients: $NUM_CONCURRENT"
echo "  Test duration:      ${DURATION}s"
echo "  API URL:            $API_URL"
echo ""

# Check API health first
log_info "Checking API health..."
if ! curl -sf "${API_URL}/health" > /dev/null 2>&1; then
    log_error "API health check failed"
    exit 1
fi
log_success "API is healthy"
echo ""

# Start concurrent SSE clients
log_info "Starting $NUM_CONCURRENT SSE clients..."
for i in $(seq 1 "$NUM_CONCURRENT"); do
    pid=$(run_sse_client "$i")
    if [[ -n "$pid" ]]; then
        STREAM_PIDS+=("$pid")
        CONNECTIONS_OPENED=$((CONNECTIONS_OPENED + 1))
    else
        CONNECTIONS_FAILED=$((CONNECTIONS_FAILED + 1))
    fi
done

log_success "Started $CONNECTIONS_OPENED clients ($CONNECTIONS_FAILED failed)"
echo ""

# Wait for test duration
log_info "Running load test for ${DURATION}s..."
sleep "$DURATION"

# Collect results
log_info "Collecting results..."

total_events=0
for i in $(seq 1 "$NUM_CONCURRENT"); do
    events_file="/tmp/load-test-events-$i.txt"
    if [[ -f "$events_file" ]]; then
        count=$(<"$events_file")
        total_events=$((total_events + count))
        rm -f "$events_file"
    fi
done

# Kill remaining clients
for pid in "${STREAM_PIDS[@]}"; do
    kill "$pid" 2>/dev/null || true
done
STREAM_PIDS=()

echo ""
echo "=========================================="
echo "  Load Test Results"
echo "=========================================="
echo ""
echo "  Duration:              ${DURATION}s"
echo "  Clients started:       $CONNECTIONS_OPENED"
echo "  Clients failed:        $CONNECTIONS_FAILED"
echo "  Total events received: $total_events"
echo "  Events per second:     $(echo "scale=2; $total_events / $DURATION" | bc 2>/dev/null || echo "N/A")"
echo "  Events per client:     $(echo "scale=2; $total_events / $CONNECTIONS_OPENED" | bc 2>/dev/null || echo "N/A")"
echo ""

# Check for memory usage if running locally
if command -v ps > /dev/null 2>&1; then
    log_info "Memory usage check:"
    echo "  Run 'kubectl top pods -n rdev' to check rdev-api memory"
fi

echo ""
if [[ $CONNECTIONS_FAILED -eq 0 ]] && [[ $total_events -gt 0 ]]; then
    log_success "Load test completed successfully"
    exit 0
else
    log_error "Load test completed with issues"
    exit 1
fi