using System.Net.Http.Json;
using System.Text;
using System.Text.Json;

namespace SilverLabs.Website.Services;

public class ProvisioningService
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<ProvisioningService> _logger;

    public ProvisioningService(IHttpClientFactory httpClientFactory, ILogger<ProvisioningService> logger)
    {
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }

    public async Task<(bool Success, string Message)> ApproveApplicationAsync(
        string ticketId, string username, string email, string fullName)
    {
        var results = new List<string>();
        var allSuccess = true;

        // SilverDESK user already exists (created at application time)
        // Only provision external services

        // 1. Create Mattermost user
        var (mmOk, mmMsg) = await CreateMattermostUserAsync(username, email, fullName);
        results.Add($"Mattermost: {mmMsg}");
        if (!mmOk) allSuccess = false;

        // 2. Create Mailcow mailbox
        var (mailOk, mailMsg) = await CreateMailcowMailboxAsync(username, fullName);
        results.Add($"Mailcow: {mailMsg}");
        if (!mailOk) allSuccess = false;

        // 3. Update the DeveloperApplication record in SilverDESK
        var (updateOk, updateMsg) = await UpdateApplicationStatusAsync(ticketId, mmOk, mailOk);
        results.Add($"Application record: {updateMsg}");
        if (!updateOk) allSuccess = false;

        var summary = string.Join("; ", results);
        _logger.LogInformation("Provisioning for {Username} (ticket {TicketId}): {Summary}", username, ticketId, summary);

        return (allSuccess, summary);
    }

    private async Task<(bool Success, string Message)> UpdateApplicationStatusAsync(
        string ticketId, bool mattermostProvisioned, bool mailcowProvisioned)
    {
        try
        {
            var client = _httpClientFactory.CreateClient("SilverDesk");

            // Look up the application by ticketId
            var lookupResponse = await client.GetAsync($"/api/developer-program/applications?ticketId={ticketId}");
            if (!lookupResponse.IsSuccessStatusCode)
            {
                var body = await lookupResponse.Content.ReadAsStringAsync();
                _logger.LogWarning("Failed to look up application by ticket {TicketId}: {Status} {Body}",
                    ticketId, lookupResponse.StatusCode, body);
                return (false, $"Lookup failed ({lookupResponse.StatusCode})");
            }

            var apps = await lookupResponse.Content.ReadFromJsonAsync<JsonElement>();
            if (apps.GetArrayLength() == 0)
            {
                _logger.LogWarning("No application found for ticket {TicketId}", ticketId);
                return (false, "No application found for ticket");
            }

            var appId = apps[0].GetProperty("id").GetString();

            // Update the application status to Approved with provisioning flags
            var updatePayload = new
            {
                status = 1, // ApplicationStatus.Approved
                mattermostProvisioned,
                mailcowProvisioned
            };

            var updateResponse = await client.PutAsJsonAsync($"/api/developer-program/applications/{appId}", updatePayload);
            if (updateResponse.IsSuccessStatusCode)
            {
                _logger.LogInformation("Application {AppId} updated to Approved for ticket {TicketId}", appId, ticketId);
                return (true, "Updated to Approved");
            }

            var updateBody = await updateResponse.Content.ReadAsStringAsync();
            _logger.LogWarning("Failed to update application {AppId}: {Status} {Body}",
                appId, updateResponse.StatusCode, updateBody);
            return (false, $"Update failed ({updateResponse.StatusCode})");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error updating application status for ticket {TicketId}", ticketId);
            return (false, $"Error: {ex.Message}");
        }
    }

    public async Task<(bool Success, string Message)> CreateSilverDeskUserAsync(string username, string email, string fullName)
    {
        try
        {
            var client = _httpClientFactory.CreateClient("SilverDesk");
            var payload = new
            {
                username,
                email,
                fullName,
                password = Guid.NewGuid().ToString("N")[..16] + "!A1"
            };
            var json = JsonSerializer.Serialize(payload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var response = await client.PostAsync("/api/users", content);
            if (response.IsSuccessStatusCode)
                return (true, "User created");

            var body = await response.Content.ReadAsStringAsync();
            _logger.LogError("SilverDESK user creation failed: {Status} {Body}", response.StatusCode, body);
            return (false, $"Failed ({response.StatusCode})");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "SilverDESK user creation error for {Username}", username);
            return (false, $"Error: {ex.Message}");
        }
    }

    public async Task<(bool Success, string Message)> CreateMattermostUserAsync(string username, string email, string fullName)
    {
        try
        {
            var client = _httpClientFactory.CreateClient("Mattermost");
            var nameParts = fullName.Split(' ', 2);
            var payload = new
            {
                email,
                username,
                first_name = nameParts[0],
                last_name = nameParts.Length > 1 ? nameParts[1] : "",
                password = Guid.NewGuid().ToString("N")[..16] + "!A1" // Temporary password
            };
            var json = JsonSerializer.Serialize(payload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var response = await client.PostAsync("/api/v4/users", content);
            if (response.IsSuccessStatusCode)
                return (true, "User created");

            var body = await response.Content.ReadAsStringAsync();
            _logger.LogError("Mattermost user creation failed: {Status} {Body}", response.StatusCode, body);
            return (false, $"Failed ({response.StatusCode})");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Mattermost user creation error for {Username}", username);
            return (false, $"Error: {ex.Message}");
        }
    }

    public async Task<(bool Success, string Message)> CreateMailcowMailboxAsync(string username, string fullName)
    {
        try
        {
            var client = _httpClientFactory.CreateClient("Mailcow");
            var tempPassword = Guid.NewGuid().ToString("N")[..16] + "!A1";
            var payload = new
            {
                local_part = username,
                domain = "silverlabs.uk",
                name = fullName,
                password = tempPassword,
                password2 = tempPassword,
                quota = 1024, // 1GB
                active = 1,
                force_pw_update = 1
            };
            var json = JsonSerializer.Serialize(payload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var response = await client.PostAsync("/api/v1/add/mailbox", content);
            if (response.IsSuccessStatusCode)
                return (true, "Mailbox created");

            var body = await response.Content.ReadAsStringAsync();
            _logger.LogError("Mailcow mailbox creation failed: {Status} {Body}", response.StatusCode, body);
            return (false, $"Failed ({response.StatusCode})");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Mailcow mailbox creation error for {Username}", username);
            return (false, $"Error: {ex.Message}");
        }
    }
}