namespace HrynCo.NotificationService.Migrator;

using HrynCo.NotificationService.DAL.Abstract.Providers;
using HrynCo.NotificationService.DAL.Abstract.Repositories;
using HrynCo.NotificationService.DAL.Abstract.Templates;
using Microsoft.Extensions.Logging;

internal sealed class DevelopmentDataSeeder
{
    internal const string DefaultServiceName = "TestService";
    internal const string DefaultLanguageCode = "en";

    private readonly IEmailChannelRepository _channels;
    private readonly IEmailTemplateRepository _templates;
    private readonly ILogger<DevelopmentDataSeeder> _logger;

    public DevelopmentDataSeeder(
        IEmailChannelRepository channels,
        IEmailTemplateRepository templates,
        ILogger<DevelopmentDataSeeder> logger)
    {
        _channels = channels;
        _templates = templates;
        _logger = logger;
    }

    public async Task SeedAsync(string serviceName, CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(serviceName))
            throw new InvalidOperationException("Development seed service name is not configured.");

        await SeedMailpitChannelAsync(serviceName, cancellationToken);

        foreach (EmailTemplate template in CreateTemplates(serviceName))
        {
            EmailTemplate? existing = await _templates.GetAsync(
                template.ServiceName, template.Key, template.LanguageCode, cancellationToken);

            if (existing is not null)
            {
                _logger.LogInformation(
                    "Development email template already exists; leaving it unchanged [ServiceName={ServiceName}, Key={TemplateKey}, LanguageCode={LanguageCode}]",
                    template.ServiceName, template.Key, template.LanguageCode);
                continue;
            }

            await _templates.AddAsync(template, cancellationToken);
            _logger.LogInformation(
                "Created development email template [ServiceName={ServiceName}, Key={TemplateKey}, LanguageCode={LanguageCode}]",
                template.ServiceName, template.Key, template.LanguageCode);
        }
    }

    private async Task SeedMailpitChannelAsync(string serviceName, CancellationToken cancellationToken)
    {
        IReadOnlyList<EmailChannel> existingChannels = await _channels.GetByServiceAsync(
            serviceName, cancellationToken);

        if (existingChannels.Count > 0)
        {
            _logger.LogInformation(
                "Development email channel already exists; leaving all channels unchanged [ServiceName={ServiceName}]",
                serviceName);
            return;
        }

        var channel = new EmailChannel
        {
            ServiceName = serviceName,
            Priority = 1,
            EmailChannelType = EmailChannelType.Smtp,
            Settings = new SmtpChannelSettings
            {
                Host = "mailpit",
                Port = 1025,
                Username = string.Empty,
                Password = string.Empty,
                UseSsl = false,
                FromEmail = "no-reply@local.hrynco.test",
                FromName = "HrynCo Development"
            },
            WarnThresholdPercent = 90,
            IsActive = true,
            Created = DateTimeOffset.UtcNow
        };

        await _channels.AddAsync(channel, cancellationToken);
        _logger.LogInformation(
            "Created Mailpit development email channel [ServiceName={ServiceName}]",
            serviceName);
    }

    private static IReadOnlyList<EmailTemplate> CreateTemplates(string serviceName)
    {
        DateTimeOffset created = DateTimeOffset.UtcNow;

        return
        [
            new EmailTemplate
            {
                ServiceName = serviceName,
                Key = "TestEmail",
                LanguageCode = DefaultLanguageCode,
                Subject = "Test notification",
                HtmlBody = "<p>Hello {{RecipientName}},</p><p>{{Message}}</p>",
                TextBody = "Hello {{RecipientName}}, {{Message}}",
                Variables =
                [
                    new EmailTemplateVariable { Name = "RecipientName", Required = true },
                    new EmailTemplateVariable { Name = "Message", Required = true }
                ],
                Created = created
            }
        ];
    }
}