/**
 * Results - Results aggregation and output for benchmarks
 * 
 * Collects benchmark results and provides formatted output
 * for comparing performance across different operations.
 * 
 * @version 0.1
 * @since 0.1
 */

namespace Implexus.Tools.Perf {

/**
 * Collects and displays benchmark results.
 * 
 * Results are organized by benchmark name (e.g., "Container", "Document")
 * and can be output as a formatted summary table.
 */
public class Results : Object {
    
    /**
     * Internal storage for benchmark results.
     * Maps benchmark name to list of operation results.
     */
    private Invercargill.DataStructures.Dictionary<string, Invercargill.DataStructures.Vector<BenchmarkResults>> _results;
    
    /**
     * Creates a new Results instance.
     */
    public Results() {
        _results = new Invercargill.DataStructures.Dictionary<string, Invercargill.DataStructures.Vector<BenchmarkResults>>();
    }
    
    /**
     * Adds a benchmark result.
     * 
     * @param benchmark The benchmark name (e.g., "Container")
     * @param result The benchmark result to add
     */
    public void add(string benchmark, BenchmarkResults result) {
        if (!_results.has(benchmark)) {
            _results.set(benchmark, new Invercargill.DataStructures.Vector<BenchmarkResults>());
        }
        _results.get(benchmark).add(result);
    }
    
    /**
     * Gets all results for a specific benchmark.
     * 
     * @param benchmark The benchmark name
     * @return An enumerable of results, or empty if not found
     */
    public Invercargill.Enumerable<BenchmarkResults> get_results(string benchmark) {
        if (!_results.has(benchmark)) {
            return new Invercargill.DataStructures.Vector<BenchmarkResults>().as_enumerable();
        }
        return _results.get(benchmark).as_enumerable();
    }
    
    /**
     * Gets all benchmark names.
     * 
     * @return An enumerable of benchmark names
     */
    public Invercargill.Enumerable<string> get_benchmark_names() {
        var names = new Invercargill.DataStructures.Vector<string>();
        foreach (var key in _results.keys) {
            names.add(key);
        }
        return names.as_enumerable();
    }
    
    /**
     * Prints a formatted summary of all benchmark results.
     */
    public void print_summary() {
        print("\n");
        print("================================================================================\n");
        print("                         IMPLEXUS PERFORMANCE RESULTS                          \n");
        print("================================================================================\n");
        print("\n");
        
        // Track overall statistics
        int total_operations = 0;
        double total_time = 0;
        
        foreach (var benchmark_name in _results.keys) {
            var results_vec = _results.get(benchmark_name);
            
            print("=== %s ===\n", benchmark_name);
            
            // Check if any results are batch operations
            bool has_batch = false;
            foreach (var result in results_vec) {
                if (result.batch_size > 0) {
                    has_batch = true;
                    break;
                }
            }
            
            if (has_batch) {
                // Extended format for batch operations
                print("%-30s %8s %10s %12s %12s %12s\n",
                    "Operation", "Iters", "Batch", "Total(ms)", "Avg(ms)", "Items/sec");
                print("--------------------------------------------------------------------------------------------------------\n");
                
                foreach (var result in results_vec) {
                    if (result.batch_size > 0) {
                        // Batch operation - show batch details
                        print("%-30s %8d %10d %12.2f %12.4f %12.2f\n",
                            result.operation,
                            result.iterations,
                            result.batch_size,
                            result.total_time_ms,
                            result.avg_item_time_ms,
                            result.items_per_second);
                    } else {
                        // Non-batch operation
                        print("%-30s %8d %10s %12.2f %12.4f %12.2f\n",
                            result.operation,
                            result.iterations,
                            "-",
                            result.total_time_ms,
                            result.avg_time_ms,
                            result.ops_per_second);
                    }
                    
                    total_operations += result.total_items;
                    total_time += result.total_time_ms;
                }
            } else {
                // Standard format
                print("%-30s %10s %12s %15s\n", "Operation", "Iterations", "Avg (ms)", "Ops/sec");
                print("--------------------------------------------------------------------------------\n");
                
                foreach (var result in results_vec) {
                    print("%-30s %10d %12.4f %15.2f\n",
                        result.operation,
                        result.iterations,
                        result.avg_time_ms,
                        result.ops_per_second);
                    
                    total_operations += result.iterations;
                    total_time += result.total_time_ms;
                }
            }
            print("\n");
        }
        
        // Print overall summary
        print("================================================================================\n");
        print("                              SUMMARY                                          \n");
        print("================================================================================\n");
        print("Total operations:    %d\n", total_operations);
        print("Total time:          %.2f ms\n", total_time);
        print("Overall throughput:  %.2f ops/sec\n", total_time > 0 ? (total_operations / total_time) * 1000 : 0);
        print("================================================================================\n");
    }
    
    /**
     * Exports results as JSON for comparison or storage.
     *
     * @return A JSON string representation of the results
     */
    public string to_json() {
        var sb = new StringBuilder();
        sb.append("{\n");
        
        bool first_benchmark = true;
        foreach (var benchmark_name in _results.keys) {
            var results_vec = _results.get(benchmark_name);
            
            if (!first_benchmark) {
                sb.append(",\n");
            }
            first_benchmark = false;
            
            sb.append("  \"%s\": [\n".printf(escape_json_string(benchmark_name)));
            
            bool first_result = true;
            foreach (var result in results_vec) {
                if (!first_result) {
                    sb.append(",\n");
                }
                first_result = false;
                
                sb.append("    {\n");
                sb.append("      \"operation\": \"%s\",\n".printf(escape_json_string(result.operation)));
                sb.append("      \"iterations\": %d,\n".printf(result.iterations));
                if (result.batch_size > 0) {
                    sb.append("      \"batch_size\": %d,\n".printf(result.batch_size));
                    sb.append("      \"total_items\": %d,\n".printf(result.total_items));
                }
                sb.append("      \"total_time_ms\": %.4f,\n".printf(result.total_time_ms));
                sb.append("      \"avg_time_ms\": %.4f,\n".printf(result.avg_time_ms));
                if (result.batch_size > 0) {
                    sb.append("      \"avg_item_time_ms\": %.4f,\n".printf(result.avg_item_time_ms));
                    sb.append("      \"items_per_second\": %.2f\n".printf(result.items_per_second));
                } else {
                    sb.append("      \"ops_per_second\": %.2f\n".printf(result.ops_per_second));
                }
                sb.append("    }");
            }
            
            sb.append("\n  ]");
        }
        
        sb.append("\n}\n");
        return sb.str;
    }
    
    /**
     * Exports results to a file.
     * 
     * @param path The file path to write to
     * @param format The output format ("text" or "json")
     * @throws Error if writing fails
     */
    public void export(string path, string format = "text") throws Error {
        string content;
        if (format == "json") {
            content = to_json();
        } else {
            content = format_as_text();
        }
        
        FileUtils.set_contents(path, content);
    }
    
    /**
     * Formats results as plain text suitable for file output.
     * 
     * @return A formatted text string
     */
    private string format_as_text() {
        var sb = new StringBuilder();
        
        sb.append("Implexus Performance Benchmark Results\n");
        sb.append("======================================\n");
        sb.append("Generated: %s\n\n".printf(new DateTime.now_utc().format("%Y-%m-%d %H:%M:%S UTC")));
        
        foreach (var benchmark_name in _results.keys) {
            var results_vec = _results.get(benchmark_name);
            
            sb.append("[%s]\n".printf(benchmark_name));
            
            foreach (var result in results_vec) {
                sb.append("  %s: %d iterations, %.4f ms avg, %.2f ops/sec\n".printf(
                    result.operation,
                    result.iterations,
                    result.avg_time_ms,
                    result.ops_per_second
                ));
            }
            sb.append("\n");
        }
        
        return sb.str;
    }
    
    /**
     * Escapes a string for JSON output.
     * 
     * @param s The string to escape
     * @return The escaped string
     */
    private string escape_json_string(string s) {
        return s.replace("\\", "\\\\")
                .replace("\"", "\\\"")
                .replace("\n", "\\n")
                .replace("\r", "\\r")
                .replace("\t", "\\t");
    }
    
    /**
     * Calculates summary statistics for a benchmark.
     * 
     * @param benchmark The benchmark name
     * @return A SummaryStats object with total_ops, total_time_ms, and avg_ops_per_sec
     */
    public SummaryStats? get_summary_stats(string benchmark) {
        if (!_results.has(benchmark)) {
            return null;
        }
        
        int total_ops = 0;
        double total_time = 0;
        
        foreach (var result in _results.get(benchmark)) {
            total_ops += result.iterations;
            total_time += result.total_time_ms;
        }
        
        double avg_ops = total_time > 0 ? (total_ops / total_time) * 1000 : 0;
        
        return new SummaryStats(total_ops, total_time, avg_ops);
    }
}

/**
 * Holds summary statistics for a benchmark.
 */
public class SummaryStats : Object {
    /**
     * Total number of operations performed.
     */
    public int total_ops { get; private set; }
    
    /**
     * Total time in milliseconds.
     */
    public double total_time_ms { get; private set; }
    
    /**
     * Average operations per second.
     */
    public double avg_ops_per_sec { get; private set; }
    
    /**
     * Creates a new SummaryStats instance.
     */
    public SummaryStats(int total_ops, double total_time_ms, double avg_ops_per_sec) {
        this.total_ops = total_ops;
        this.total_time_ms = total_time_ms;
        this.avg_ops_per_sec = avg_ops_per_sec;
    }
}

}