DiunaBI/DiunaBI.UI.Shared/Services/LayerService.cs

using System.Net.Http.Json;
using System.Text.Json;
using DiunaBI.Application.DTOModels;
using DiunaBI.Application.DTOModels.Common;

namespace DiunaBI.UI.Shared.Services;

public class LayerService
{
    private readonly HttpClient _httpClient;

    public LayerService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }
    
    private readonly JsonSerializerOptions _jsonOptions = new()
    {
        PropertyNameCaseInsensitive = true
    };

    public async Task<PagedResult<LayerDto>> GetLayersAsync(LayerFilterRequest filterRequest)
    {
        // Calculate start index from page number (page 1 = start 0, page 2 = start 50, etc.)
        var start = (filterRequest.Page - 1) * filterRequest.PageSize;
        var query = $"Layers?start={start}&limit={filterRequest.PageSize}";

        if (!string.IsNullOrEmpty(filterRequest.Search))
            query += $"&name={Uri.EscapeDataString(filterRequest.Search)}";

        if (filterRequest.Type.HasValue)
            query += $"&type={(int)filterRequest.Type.Value}";

        var response = await _httpClient.GetAsync(query);
        response.EnsureSuccessStatusCode();

        var json = await response.Content.ReadAsStringAsync();
        var result = JsonSerializer.Deserialize<PagedResult<LayerDto>>(json, _jsonOptions);

        return result ?? new PagedResult<LayerDto>();
    }

    public async Task<LayerDto?> GetLayerByIdAsync(Guid id)
    {
        var response = await _httpClient.GetAsync($"Layers/{id}");
        
        if (!response.IsSuccessStatusCode)
            return null;
        
        return await response.Content.ReadFromJsonAsync<LayerDto>();
    }

    public async Task<bool> UpdateRecordsAsync(Guid layerId, List<RecordDto> records)
    {
        // TODO: Implement if needed - backend doesn't have PUT endpoint yet
        // For now we don't need it for read-only view
        return await Task.FromResult(false);
    }

    public async Task<RecordDto?> CreateRecordAsync(Guid layerId, RecordDto record)
    {
        var response = await _httpClient.PostAsJsonAsync($"Layers/{layerId}/records", record);

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync();
            Console.Error.WriteLine($"CreateRecordAsync failed: {response.StatusCode} - {error}");
            return null;
        }

        return await response.Content.ReadFromJsonAsync<RecordDto>();
    }

    public async Task<RecordDto?> UpdateRecordAsync(Guid layerId, Guid recordId, RecordDto record)
    {
        var response = await _httpClient.PutAsJsonAsync($"Layers/{layerId}/records/{recordId}", record);

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync();
            Console.Error.WriteLine($"UpdateRecordAsync failed: {response.StatusCode} - {error}");
            return null;
        }

        return await response.Content.ReadFromJsonAsync<RecordDto>();
    }

    public async Task<bool> DeleteRecordAsync(Guid layerId, Guid recordId)
    {
        var response = await _httpClient.DeleteAsync($"Layers/{layerId}/records/{recordId}");
        return response.IsSuccessStatusCode;
    }

    public async Task<List<RecordHistoryDto>> GetRecordHistoryAsync(Guid layerId, Guid recordId)
    {
        var response = await _httpClient.GetAsync($"Layers/{layerId}/records/{recordId}/history");

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync();
            Console.Error.WriteLine($"GetRecordHistoryAsync failed: {response.StatusCode} - {error}");
            return new List<RecordHistoryDto>();
        }

        return await response.Content.ReadFromJsonAsync<List<RecordHistoryDto>>() ?? new List<RecordHistoryDto>();
    }

    public async Task<List<DeletedRecordDto>> GetDeletedRecordsAsync(Guid layerId)
    {
        var response = await _httpClient.GetAsync($"Layers/{layerId}/records/deleted");

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync();
            Console.Error.WriteLine($"GetDeletedRecordsAsync failed: {response.StatusCode} - {error}");
            return new List<DeletedRecordDto>();
        }

        return await response.Content.ReadFromJsonAsync<List<DeletedRecordDto>>() ?? new List<DeletedRecordDto>();
    }
}