using HanaToolbox.Config;
using HanaToolbox.Logging;
using HanaToolbox.Services;
using HanaToolbox.Services.Interfaces;
using Spectre.Console;

namespace HanaToolbox.Tui;

/// <summary>
/// Interactive TUI for managing hdbuserstore keys.
/// Mirrors keymanager.sh flow: Create / Delete / Test.
/// </summary>
public sealed class KeyManagerTui(
    KeyManagerService keyService,
    IHdbClientLocator locator,
    AppLogger _logger)
{
    public async Task RunAsync(HanaConfig hana, string sid, CancellationToken ct = default)
    {
        var hdbsql = locator.LocateHdbsql(hana.HdbsqlPath, sid, hana.InstanceNumber);

        while (true)
        {
            AnsiConsole.Clear();
            AnsiConsole.Write(new Rule("[blue]SAP HANA Secure User Store Key Manager[/]").RuleStyle("blue"));
            AnsiConsole.WriteLine();

            var choice = AnsiConsole.Prompt(
                new SelectionPrompt<string>()
                    .Title("Select an action:")
                    .AddChoices("Create a New Key", "Delete an Existing Key",
                                "Test an Existing Key", "Exit")
                    .HighlightStyle("cyan"));

            switch (choice)
            {
                case "Create a New Key":
                    await CreateKeyAsync(hdbsql, hana, sid, ct);
                    break;
                case "Delete an Existing Key":
                    await DeleteKeyAsync(sid, ct);
                    break;
                case "Test an Existing Key":
                    await TestKeyAsync(hdbsql, sid, ct);
                    break;
                case "Exit":
                    return;
            }

            AnsiConsole.MarkupLine("\n[grey]Press any key to continue...[/]");
            Console.ReadKey(intercept: true);
        }
    }

    private async Task CreateKeyAsync(
        string hdbsql, HanaConfig hana, string sid, CancellationToken ct)
    {
        AnsiConsole.Write(new Rule("[blue]Create New Key[/]").RuleStyle("blue"));

        var keyName    = AnsiConsole.Prompt(new TextPrompt<string>("Key name:").DefaultValue("CRONKEY"));
        var host       = AnsiConsole.Prompt(new TextPrompt<string>("HANA host:").DefaultValue(System.Net.Dns.GetHostName()));
        var instance   = AnsiConsole.Prompt(new TextPrompt<string>("Instance number:").DefaultValue(hana.InstanceNumber));
        var isSystemDb = AnsiConsole.Confirm("Connecting to SYSTEMDB?", defaultValue: false);

        string connStr;
        if (isSystemDb)
        {
            connStr = $"{host}:3{instance}13";
        }
        else
        {
            var tenant = AnsiConsole.Prompt(new TextPrompt<string>("Tenant DB name:").DefaultValue(sid.ToUpperInvariant()));
            connStr = $"{host}:3{instance}15@{tenant}";
        }

        var user = AnsiConsole.Prompt(new TextPrompt<string>("Database user:").DefaultValue("SYSTEM"));
        var pass = AnsiConsole.Prompt(new TextPrompt<string>("Password:").Secret());

        AnsiConsole.MarkupLine($"\n[yellow]Command preview:[/] hdbuserstore SET \"{keyName}\" \"{connStr}\" \"{user}\" <password>");
        if (!AnsiConsole.Confirm("Execute?", defaultValue: true)) return;

        var created = await keyService.CreateKeyAsync(keyName, connStr, user, pass, sid, ct);
        if (!created) return;

        // Auto-test and rollback on failure
        var ok = await keyService.TestKeyAsync(hdbsql, keyName, sid, ct);
        if (!ok)
        {
            AnsiConsole.MarkupLine("[yellow]Rolling back: deleting key due to connection failure...[/]");
            await keyService.DeleteKeyAsync(keyName, sid, ct);
        }
    }

    private async Task DeleteKeyAsync(string sid, CancellationToken ct)
    {
        AnsiConsole.Write(new Rule("[red]Delete Key[/]").RuleStyle("red"));

        var keys = await keyService.ListKeysAsync(sid, ct);
        if (keys.Count == 0)
        {
            AnsiConsole.MarkupLine("[yellow]No keys found.[/]");
            return;
        }

        var key = AnsiConsole.Prompt(
            new SelectionPrompt<string>()
                .Title("Select key to delete:")
                .AddChoices(keys)
                .HighlightStyle("red"));

        if (!AnsiConsole.Confirm($"Permanently delete '{key}'?", defaultValue: false)) return;
        await keyService.DeleteKeyAsync(key, sid, ct);
    }

    private async Task TestKeyAsync(string hdbsql, string sid, CancellationToken ct)
    {
        AnsiConsole.Write(new Rule("[blue]Test Key[/]").RuleStyle("blue"));

        var keys = await keyService.ListKeysAsync(sid, ct);
        if (keys.Count == 0)
        {
            AnsiConsole.MarkupLine("[yellow]No keys found.[/]");
            return;
        }

        var key = AnsiConsole.Prompt(
            new SelectionPrompt<string>()
                .Title("Select key to test:")
                .AddChoices(keys)
                .HighlightStyle("cyan"));

        await keyService.TestKeyAsync(hdbsql, key, sid, ct);
    }
}