using System.Net.Http.Json;
using Tasks.Module.Models;

namespace Tasks.Module.Services;

public interface ITodoService
{
    Task<List<TodoItemDto>> GetAllTodosAsync(TodoFilterDto? filter = null);
    Task<TodoItemDto?> GetTodoByIdAsync(string id);
    Task<TodoItemDto> CreateTodoAsync(CreateTodoItemDto createDto);
    Task<TodoItemDto?> UpdateTodoAsync(UpdateTodoItemDto updateDto);
    Task<bool> DeleteTodoAsync(string id);
    Task<TodoItemDto?> ToggleCompleteAsync(string id);
}

public class TodoService : ITodoService
{
    private readonly HttpClient _httpClient;

    public TodoService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<List<TodoItemDto>> GetAllTodosAsync(TodoFilterDto? filter = null)
    {
        var url = $"/api/v1/todos";
        
        var queryParams = new List<string>();
        if (filter?.IsCompleted != null)
            queryParams.Add($"isCompleted={filter.IsCompleted}");
        if (filter?.Priority != null)
            queryParams.Add($"priority={filter.Priority}");
        if (filter?.DueDate != null)
            queryParams.Add($"dueDate={filter.DueDate:yyyy-MM-ddTHH:mm:ssZ}");
        if (!string.IsNullOrEmpty(filter?.ParentId))
            queryParams.Add($"parentId={filter.ParentId}");

        if (queryParams.Any())
            url += "?" + string.Join("&", queryParams);

        return await _httpClient.GetFromJsonAsync<List<TodoItemDto>>(url) ?? new List<TodoItemDto>();
    }

    public async Task<TodoItemDto?> GetTodoByIdAsync(string id)
    {
        return await _httpClient.GetFromJsonAsync<TodoItemDto>($"/api/v1/todos/{id}");
    }

    public async Task<TodoItemDto> CreateTodoAsync(CreateTodoItemDto createDto)
    {
        var response = await _httpClient.PostAsJsonAsync("/api/v1/todos", createDto);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadFromJsonAsync<TodoItemDto>() ?? throw new Exception("Failed to create todo");
    }

    public async Task<TodoItemDto?> UpdateTodoAsync(UpdateTodoItemDto updateDto)
    {
        var response = await _httpClient.PutAsJsonAsync("/api/v1/todos", updateDto);
        if (!response.IsSuccessStatusCode)
            return null;
        return await response.Content.ReadFromJsonAsync<TodoItemDto>();
    }

    public async Task<bool> DeleteTodoAsync(string id)
    {
        var response = await _httpClient.DeleteAsync($"/api/v1/todos/{id}");
        return response.IsSuccessStatusCode;
    }

    public async Task<TodoItemDto?> ToggleCompleteAsync(string id)
    {
        var response = await _httpClient.PatchAsync($"/api/v1/todos/{id}/toggle", null);
        if (!response.IsSuccessStatusCode)
            return null;
        return await response.Content.ReadFromJsonAsync<TodoItemDto>();
    }
}