verify_implementation.sh

# Copyright 2026 Erst Users
# SPDX-License-Identifier: Apache-2.0

#!/bin/bash
# Copyright (c) Hintents Authors.
# SPDX-License-Identifier: Apache-2.0

# Verification script for Prometheus metrics implementation
# This script checks that all files are in place and have correct structure

echo "=== Prometheus Metrics Implementation Verification ==="
echo

# Check if Go is available
if ! command -v go &> /dev/null; then
    echo "⚠️  Go is not installed - skipping compilation checks"
    echo "   Install Go to run full verification"
    GO_AVAILABLE=false
else
    echo "✓ Go is installed: $(go version)"
    GO_AVAILABLE=true
fi
echo

# Check file structure
echo "=== Checking File Structure ==="
files=(
    "internal/metrics/prometheus.go"
    "internal/metrics/prometheus_test.go"
    "internal/metrics/integration_test.go"
    "internal/metrics/README.md"
    "docs/PROMETHEUS_METRICS.md"
    "docs/METRICS_VERIFICATION.md"
    "docs/METRICS_QUICK_REFERENCE.md"
    "docs/METRICS_TESTING.md"
)

for file in "${files[@]}"; do
    if [ -f "$file" ]; then
        echo "✓ $file exists"
    else
        echo "✗ $file missing"
    fi
done
echo

# Check modified files
echo "=== Checking Modified Files ==="
modified_files=(
    "go.mod"
    "internal/daemon/server.go"
    "internal/simulator/runner.go"
    "internal/rpc/client.go"
)

for file in "${modified_files[@]}"; do
    if [ -f "$file" ]; then
        echo "✓ $file exists"
    else
        echo "✗ $file missing"
    fi
done
echo

# Check for key content in files
echo "=== Checking Key Content ==="

# Check prometheus.go has metrics
if grep -q "remote_node_last_response_timestamp_seconds" internal/metrics/prometheus.go; then
    echo "✓ Timestamp metric defined"
else
    echo "✗ Timestamp metric missing"
fi

if grep -q "remote_node_response_total" internal/metrics/prometheus.go; then
    echo "✓ Response counter metric defined"
else
    echo "✗ Response counter metric missing"
fi

if grep -q "remote_node_response_duration_seconds" internal/metrics/prometheus.go; then
    echo "✓ Duration histogram metric defined"
else
    echo "✗ Duration histogram metric missing"
fi

if grep -q "simulation_execution_total" internal/metrics/prometheus.go; then
    echo "✓ Simulation counter metric defined"
else
    echo "✗ Simulation counter metric missing"
fi

# Check daemon server has metrics endpoint
if grep -q "promhttp.Handler()" internal/daemon/server.go; then
    echo "✓ Metrics endpoint added to daemon"
else
    echo "✗ Metrics endpoint missing from daemon"
fi

# Check RPC client records metrics
if grep -q "metrics.RecordRemoteNodeResponse" internal/rpc/client.go; then
    echo "✓ RPC client records metrics"
else
    echo "✗ RPC client doesn't record metrics"
fi

# Check simulator records metrics
if grep -q "metrics.RecordSimulationExecution" internal/simulator/runner.go; then
    echo "✓ Simulator records metrics"
else
    echo "✗ Simulator doesn't record metrics"
fi

# Check go.mod has prometheus dependency
if grep -q "prometheus/client_golang" go.mod; then
    echo "✓ Prometheus dependency added"
else
    echo "✗ Prometheus dependency missing"
fi
echo

# Run Go checks if available
if [ "$GO_AVAILABLE" = true ]; then
    echo "=== Running Go Checks ==="
    
    # Check syntax
    echo "Checking syntax..."
    if go fmt ./internal/metrics/... > /dev/null 2>&1; then
        echo "✓ Metrics package syntax is valid"
    else
        echo "✗ Metrics package has syntax errors"
    fi
    
    # Try to build (without running tests)
    echo "Checking if code compiles..."
    if go build -o /dev/null ./internal/metrics/... 2>&1 | grep -q "no Go files"; then
        echo "✓ Metrics package structure is valid"
    elif go list ./internal/metrics/... > /dev/null 2>&1; then
        echo "✓ Metrics package can be listed"
    else
        echo "⚠️  Could not verify compilation (may need dependencies)"
    fi
    
    echo
fi

# Check documentation
echo "=== Checking Documentation ==="

if grep -q "remote_node_last_response_timestamp_seconds" docs/PROMETHEUS_METRICS.md; then
    echo "✓ Documentation includes timestamp metric"
else
    echo "✗ Documentation missing timestamp metric"
fi

if grep -q "time() - remote_node_last_response_timestamp_seconds > 60" docs/PROMETHEUS_METRICS.md; then
    echo "✓ Documentation includes staleness alert example"
else
    echo "✗ Documentation missing staleness alert example"
fi

if grep -q "PromQL" docs/PROMETHEUS_METRICS.md; then
    echo "✓ Documentation includes PromQL queries"
else
    echo "✗ Documentation missing PromQL queries"
fi
echo

# Summary
echo "=== Verification Summary ==="
echo
echo "Implementation appears to be complete!"
echo
echo "Next steps:"
echo "1. Run 'go mod tidy' to download dependencies"
echo "2. Run 'go test ./internal/metrics' to run unit tests"
echo "3. Run 'go test -tags=integration ./internal/metrics' for integration tests"
echo "4. Start daemon with 'erst daemon --port 8080 --network testnet'"
echo "5. Check metrics at 'curl http://localhost:8080/metrics'"
echo
echo "For detailed verification, see docs/METRICS_VERIFICATION.md"