using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using LingAdmin.API.Data;
using LingAdmin.API.Models;
using LingAdmin.API.DTOs;
using Dapr.Client;

namespace LingAdmin.API.Controllers;

[ApiController]
[Route("api/[controller]")]
public class InventoryController : ControllerBase
{
    private readonly AppDbContext _context;
    private readonly DaprClient _daprClient;
    private readonly ILogger<InventoryController> _logger;

    public InventoryController(AppDbContext context, DaprClient daprClient, ILogger<InventoryController> logger)
    {
        _context = context;
        _daprClient = daprClient;
        _logger = logger;
    }

    [HttpGet]
    public async Task<ActionResult<ApiResponse<List<InventoryItem>>>> GetInventory()
    {
        try
        {
            var items = await _context.InventoryItems.ToListAsync();
            return Ok(ApiResponse<List<InventoryItem>>.Success(items));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving inventory items");
            return StatusCode(500, ApiResponse<List<InventoryItem>>.Error("Internal server error", 500));
        }
    }

    [HttpGet("{id}")]
    public async Task<ActionResult<ApiResponse<InventoryItem>>> GetInventoryItem(int id)
    {
        try
        {
            var item = await _context.InventoryItems.FindAsync(id);
            if (item == null)
            {
                return NotFound(ApiResponse<InventoryItem>.Error("Item not found", 404));
            }
            return Ok(ApiResponse<InventoryItem>.Success(item));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving inventory item {Id}", id);
            return StatusCode(500, ApiResponse<InventoryItem>.Error("Internal server error", 500));
        }
    }

    [HttpPost]
    public async Task<ActionResult<ApiResponse<InventoryItem>>> CreateInventoryItem(InventoryItem item)
    {
        try
        {
            _context.InventoryItems.Add(item);
            await _context.SaveChangesAsync();

            // Publish event via Dapr
            await _daprClient.PublishEventAsync("pubsub", "inventory-created", item);

            return CreatedAtAction(nameof(GetInventoryItem), new { id = item.Id }, ApiResponse<InventoryItem>.Success(item));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error creating inventory item");
            return StatusCode(500, ApiResponse<InventoryItem>.Error("Internal server error", 500));
        }
    }

    [HttpPut("{id}")]
    public async Task<ActionResult<ApiResponse<InventoryItem>>> UpdateInventoryItem(int id, InventoryItem item)
    {
        if (id != item.Id)
        {
            return BadRequest(ApiResponse<InventoryItem>.Error("ID mismatch", 400));
        }

        try
        {
            _context.Entry(item).State = EntityState.Modified;
            await _context.SaveChangesAsync();

            // Publish event via Dapr
            await _daprClient.PublishEventAsync("pubsub", "inventory-updated", item);

            return Ok(ApiResponse<InventoryItem>.Success(item));
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!await _context.InventoryItems.AnyAsync(e => e.Id == id))
            {
                return NotFound(ApiResponse<InventoryItem>.Error("Item not found", 404));
            }
            throw;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error updating inventory item {Id}", id);
            return StatusCode(500, ApiResponse<InventoryItem>.Error("Internal server error", 500));
        }
    }

    [HttpDelete("{id}")]
    public async Task<ActionResult<ApiResponse<object>>> DeleteInventoryItem(int id)
    {
        try
        {
            var item = await _context.InventoryItems.FindAsync(id);
            if (item == null)
            {
                return NotFound(ApiResponse<object>.Error("Item not found", 404));
            }

            _context.InventoryItems.Remove(item);
            await _context.SaveChangesAsync();

            // Publish event via Dapr
            await _daprClient.PublishEventAsync("pubsub", "inventory-deleted", new { id });

            return Ok(ApiResponse<object>.Success(new { message = "Item deleted successfully" }));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error deleting inventory item {Id}", id);
            return StatusCode(500, ApiResponse<object>.Error("Internal server error", 500));
        }
    }
}