using System.Text;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using SatelliteProvider.Common.Configs;
using SatelliteProvider.DataAccess.Models;

namespace SatelliteProvider.Services.RouteManagement;

// AZ-364 / C11: extracted from RouteProcessingService.GenerateRouteSummaryAsync.
// Owns the route_<id>_summary.txt path and the StringBuilder block that
// describes the route, tile statistics, and produced files. Output content
// preserved verbatim to satisfy AC-2 (byte-identical for existing scenarios).
public class RouteSummaryWriter
{
    private readonly StorageConfig _storageConfig;
    private readonly ILogger<RouteSummaryWriter> _logger;

    public RouteSummaryWriter(IOptions<StorageConfig> storageConfig, ILogger<RouteSummaryWriter> logger)
    {
        ArgumentNullException.ThrowIfNull(storageConfig);
        _storageConfig = storageConfig.Value;
        _logger = logger;
    }

    public async Task<string> WriteAsync(
        RouteEntity route,
        int uniqueTiles,
        int totalTilesFromRegions,
        int duplicateTiles,
        string? tilesZipPath,
        CancellationToken cancellationToken = default)
    {
        ArgumentNullException.ThrowIfNull(route);

        Directory.CreateDirectory(_storageConfig.ReadyDirectory);
        var filePath = Path.Combine(_storageConfig.ReadyDirectory, $"route_{route.Id}_summary.txt");

        var summary = new StringBuilder();
        summary.AppendLine("Route Maps Summary");
        summary.AppendLine("==================");
        summary.AppendLine($"Route ID: {route.Id}");
        summary.AppendLine($"Route Name: {route.Name}");
        if (!string.IsNullOrEmpty(route.Description))
        {
            summary.AppendLine($"Description: {route.Description}");
        }
        summary.AppendLine($"Total Points: {route.TotalPoints}");
        summary.AppendLine($"Total Distance: {route.TotalDistanceMeters:F2} meters");
        summary.AppendLine($"Region Size: {route.RegionSizeMeters:F0} meters");
        summary.AppendLine($"Zoom Level: {route.ZoomLevel}");
        summary.AppendLine();
        summary.AppendLine("Tile Statistics:");
        summary.AppendLine($"- Unique Tiles: {uniqueTiles}");
        summary.AppendLine($"- Total Tiles from Regions: {totalTilesFromRegions}");
        summary.AppendLine($"- Duplicate Tiles (overlap): {duplicateTiles}");
        summary.AppendLine();
        summary.AppendLine("Files Created:");
        summary.AppendLine($"- CSV: route_{route.Id}_ready.csv");
        summary.AppendLine($"- Summary: route_{route.Id}_summary.txt");
        if (route.RequestMaps)
        {
            summary.AppendLine($"- Stitched Map: route_{route.Id}_stitched.jpg");
        }
        if (tilesZipPath != null)
        {
            summary.AppendLine($"- Tiles ZIP: route_{route.Id}_tiles.zip");
        }
        summary.AppendLine();
        summary.AppendLine($"Completed: {DateTime.UtcNow:yyyy-MM-dd HH:mm:ss} UTC");

        await File.WriteAllTextAsync(filePath, summary.ToString(), cancellationToken);

        _logger.LogInformation("Route summary generated: {FilePath}", filePath);
        return filePath;
    }
}