using System.Diagnostics;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OTSSignsOrchestrator.Core.Configuration;
using OTSSignsOrchestrator.Core.Models.DTOs;
using OTSSignsOrchestrator.Core.Models.Entities;
using OTSSignsOrchestrator.Core.Services;

namespace OTSSignsOrchestrator.Desktop.Services;

/// <summary>
/// Docker CLI service that executes docker commands on a remote host over SSH.
/// Requires an SshHost to be set before use via SetHost().
/// </summary>
public class SshDockerCliService : IDockerCliService
{
    private readonly SshConnectionService _ssh;
    private readonly DockerOptions _options;
    private readonly ILogger<SshDockerCliService> _logger;
    private SshHost? _currentHost;

    public SshDockerCliService(
        SshConnectionService ssh,
        IOptions<DockerOptions> options,
        ILogger<SshDockerCliService> logger)
    {
        _ssh = ssh;
        _options = options.Value;
        _logger = logger;
    }

    /// <summary>
    /// Set the SSH host to use for Docker commands.
    /// </summary>
    public void SetHost(SshHost host)
    {
        _currentHost = host;
    }

    public SshHost? CurrentHost => _currentHost;

    public async Task<DeploymentResultDto> DeployStackAsync(string stackName, string composeYaml, bool resolveImage = false)
    {
        EnsureHost();
        var sw = Stopwatch.StartNew();

        var args = "docker stack deploy --compose-file -";
        if (resolveImage)
            args += " --resolve-image changed";
        args += $" {stackName}";

        _logger.LogInformation("Deploying stack via SSH: {StackName} on {Host}", stackName, _currentHost!.Label);

        var (exitCode, stdout, stderr) = await _ssh.RunCommandWithStdinAsync(_currentHost, args, composeYaml);
        sw.Stop();

        var result = new DeploymentResultDto
        {
            StackName = stackName,
            Success = exitCode == 0,
            ExitCode = exitCode,
            Output = stdout,
            ErrorMessage = stderr,
            Message = exitCode == 0 ? "Success" : "Failed",
            DurationMs = sw.ElapsedMilliseconds
        };

        if (result.Success)
            _logger.LogInformation("Stack deployed via SSH: {StackName} | duration={DurationMs}ms", stackName, result.DurationMs);
        else
            _logger.LogError("Stack deploy failed via SSH: {StackName} | error={Error}", stackName, result.ErrorMessage);

        return result;
    }

    public async Task<DeploymentResultDto> RemoveStackAsync(string stackName)
    {
        EnsureHost();
        var sw = Stopwatch.StartNew();

        _logger.LogInformation("Removing stack via SSH: {StackName} on {Host}", stackName, _currentHost!.Label);

        var (exitCode, stdout, stderr) = await _ssh.RunCommandAsync(_currentHost, $"docker stack rm {stackName}");
        sw.Stop();

        var result = new DeploymentResultDto
        {
            StackName = stackName,
            Success = exitCode == 0,
            ExitCode = exitCode,
            Output = stdout,
            ErrorMessage = stderr,
            Message = exitCode == 0 ? "Success" : "Failed",
            DurationMs = sw.ElapsedMilliseconds
        };

        if (result.Success)
            _logger.LogInformation("Stack removed via SSH: {StackName}", stackName);
        else
            _logger.LogError("Stack remove failed via SSH: {StackName} | error={Error}", stackName, result.ErrorMessage);

        return result;
    }

    public async Task<List<StackInfo>> ListStacksAsync()
    {
        EnsureHost();

        var (exitCode, stdout, _) = await _ssh.RunCommandAsync(
            _currentHost!, "docker stack ls --format '{{.Name}}\\t{{.Services}}'");

        if (exitCode != 0 || string.IsNullOrWhiteSpace(stdout))
            return new List<StackInfo>();

        return stdout
            .Split('\n', StringSplitOptions.RemoveEmptyEntries)
            .Select(line =>
            {
                var parts = line.Split('\t', 2);
                return new StackInfo
                {
                    Name = parts[0].Trim(),
                    ServiceCount = parts.Length > 1 && int.TryParse(parts[1].Trim(), out var c) ? c : 0
                };
            })
            .ToList();
    }

    public async Task<List<ServiceInfo>> InspectStackServicesAsync(string stackName)
    {
        EnsureHost();

        var (exitCode, stdout, _) = await _ssh.RunCommandAsync(
            _currentHost!, $"docker stack services {stackName} --format '{{{{.Name}}}}\\t{{{{.Image}}}}\\t{{{{.Replicas}}}}'");

        if (exitCode != 0 || string.IsNullOrWhiteSpace(stdout))
            return new List<ServiceInfo>();

        return stdout
            .Split('\n', StringSplitOptions.RemoveEmptyEntries)
            .Select(line =>
            {
                var parts = line.Split('\t', 3);
                return new ServiceInfo
                {
                    Name = parts.Length > 0 ? parts[0].Trim() : "",
                    Image = parts.Length > 1 ? parts[1].Trim() : "",
                    Replicas = parts.Length > 2 ? parts[2].Trim() : ""
                };
            })
            .ToList();
    }

    public async Task<bool> EnsureDirectoryAsync(string path)
    {
        EnsureHost();
        var (exitCode, _, stderr) = await _ssh.RunCommandAsync(_currentHost!, $"mkdir -p {path}");
        if (exitCode != 0)
            _logger.LogWarning("Failed to create directory {Path} on {Host}: {Error}", path, _currentHost!.Label, stderr);
        else
            _logger.LogInformation("Ensured directory exists on {Host}: {Path}", _currentHost!.Label, path);
        return exitCode == 0;
    }

    public async Task<bool> EnsureSmbFoldersAsync(
        string cifsServer,
        string cifsShareName,
        string cifsUsername,
        string cifsPassword,
        IEnumerable<string> folderNames,
        string? cifsShareFolder = null)
    {
        EnsureHost();
        var allSucceeded = true;
        var subFolder = (cifsShareFolder ?? string.Empty).Trim('/');

        // If a subfolder is specified, ensure it exists first
        if (!string.IsNullOrEmpty(subFolder))
        {
            var mkdirCmd = $"smbclient //{cifsServer}/{cifsShareName} -U '{cifsUsername}%{cifsPassword}' -c 'mkdir {subFolder}' 2>&1";
            var (_, mkdirOut, _) = await _ssh.RunCommandAsync(_currentHost!, mkdirCmd);
            var mkdirOutput = mkdirOut ?? string.Empty;

            var alreadyExists = mkdirOutput.Contains("NT_STATUS_OBJECT_NAME_COLLISION", StringComparison.OrdinalIgnoreCase)
                             || mkdirOutput.Contains("already exists", StringComparison.OrdinalIgnoreCase);
            var success = alreadyExists || !mkdirOutput.Contains("NT_STATUS_", StringComparison.OrdinalIgnoreCase);

            if (success)
                _logger.LogInformation("SMB subfolder ensured: //{Server}/{Share}/{Folder}", cifsServer, cifsShareName, subFolder);
            else
            {
                _logger.LogWarning("Failed to create SMB subfolder //{Server}/{Share}/{Folder}: {Output}",
                    cifsServer, cifsShareName, subFolder, mkdirOutput.Trim());
                allSucceeded = false;
            }
        }

        // Build the target path prefix for volume folders
        var pathPrefix = string.IsNullOrEmpty(subFolder) ? string.Empty : $"{subFolder}/";

        foreach (var folder in folderNames)
        {
            var targetFolder = $"{pathPrefix}{folder}";
            // Run smbclient on the remote Docker host to create the folder on the share.
            // NT_STATUS_OBJECT_NAME_COLLISION means it already exists — treat as success.
            var cmd = $"smbclient //{cifsServer}/{cifsShareName} -U '{cifsUsername}%{cifsPassword}' -c 'mkdir {targetFolder}' 2>&1";
            var (_, stdout, _) = await _ssh.RunCommandAsync(_currentHost!, cmd);
            var output = stdout ?? string.Empty;

            var exists = output.Contains("NT_STATUS_OBJECT_NAME_COLLISION", StringComparison.OrdinalIgnoreCase)
                      || output.Contains("already exists", StringComparison.OrdinalIgnoreCase);
            var ok = exists || !output.Contains("NT_STATUS_", StringComparison.OrdinalIgnoreCase);

            if (ok)
                _logger.LogInformation("SMB folder ensured: //{Server}/{Share}/{Folder}", cifsServer, cifsShareName, targetFolder);
            else
            {
                _logger.LogWarning("Failed to create SMB folder //{Server}/{Share}/{Folder}: {Output}",
                    cifsServer, cifsShareName, targetFolder, output.Trim());
                allSucceeded = false;
            }
        }

        return allSucceeded;
    }

    private void EnsureHost()
    {
        if (_currentHost == null)
            throw new InvalidOperationException("No SSH host configured. Call SetHost() before using Docker commands.");
    }

    public async Task<bool> RemoveStackVolumesAsync(string stackName)
    {
        EnsureHost();

        // ── 1. Remove the stack first so containers release the volumes ─────
        _logger.LogInformation("Removing stack {StackName} before volume cleanup", stackName);
        var (rmExit, _, rmErr) = await _ssh.RunCommandAsync(_currentHost!,
            $"docker stack rm {stackName} 2>&1 || true");
        if (rmExit != 0)
            _logger.LogWarning("Stack rm returned non-zero for {StackName}: {Err}", stackName, rmErr);

        // Give Swarm a moment to tear down containers on all nodes
        await Task.Delay(5000);

        // ── 2. Clean volumes on the local (manager) node ────────────────────
        var localCmd = $"docker volume ls --filter \"name={stackName}_\" -q | xargs -r docker volume rm 2>&1 || true";
        var (_, localOut, _) = await _ssh.RunCommandAsync(_currentHost!, localCmd);
        if (!string.IsNullOrEmpty(localOut?.Trim()))
            _logger.LogInformation("Volume cleanup (manager): {Output}", localOut!.Trim());

        // ── 3. Clean volumes on ALL swarm nodes via a temporary global service ──
        // This deploys a short-lived container on every node that mounts the Docker
        // socket and removes matching volumes. This handles worker nodes that the
        // orchestrator has no direct SSH access to.
        var cleanupSvcName = $"vol-cleanup-{stackName}".Replace("_", "-");

        // Remove leftover cleanup service from a previous run (if any)
        await _ssh.RunCommandAsync(_currentHost!,
            $"docker service rm {cleanupSvcName} 2>/dev/null || true");

        var createCmd = string.Join(" ",
            "docker service create",
            "--detach",
            "--mode global",
            "--restart-condition none",
            $"--name {cleanupSvcName}",
            "--mount type=bind,source=/var/run/docker.sock,target=/var/run/docker.sock",
            "docker:cli",
            "sh", "-c",
            $"'docker volume ls -q --filter name={stackName}_ | xargs -r docker volume rm 2>&1; echo done'");

        _logger.LogInformation("Deploying global volume-cleanup service on all swarm nodes for {StackName}", stackName);
        var (svcExit, svcOut, svcErr) = await _ssh.RunCommandAsync(_currentHost!, createCmd);

        if (svcExit != 0)
        {
            _logger.LogWarning("Global volume cleanup service creation failed: {Err}", svcErr);
        }
        else
        {
            // Wait for the cleanup tasks to finish on all nodes
            _logger.LogInformation("Waiting for volume cleanup tasks to complete on all nodes...");
            await Task.Delay(10000);
        }

        // Remove the cleanup service
        await _ssh.RunCommandAsync(_currentHost!,
            $"docker service rm {cleanupSvcName} 2>/dev/null || true");

        _logger.LogInformation("Volume cleanup complete for stack {StackName}", stackName);
        return true;
    }
}