using LocationsApi.Models;
using LocationsApi.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using MongoDB.Driver;
using System.Net.Http.Headers;
using System.Security.Claims;
using System.Text;
using System.Text.Json;

namespace LocationsApi.Controllers;

[ApiController]
[Route("api/[controller]")]
public class LocationsController : ControllerBase
{
    private readonly LocationStore _locations;
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly IConfiguration _configuration;
    private readonly ILogger<LocationsController> _logger;

    public LocationsController(LocationStore locations, IHttpClientFactory httpClientFactory, IConfiguration configuration, ILogger<LocationsController> logger)
    {
        _locations = locations;
        _httpClientFactory = httpClientFactory;
        _configuration = configuration;
        _logger = logger;
    }

    [HttpPost]
    [Authorize(Roles = "SUPER")]
    public async Task<IActionResult> Create([FromBody] CreateLocationRequest req)
    {
        if (string.IsNullOrWhiteSpace(req.Name))
            return BadRequest("Name required");

        if (req.Coord is null)
            return BadRequest("Coord required");

        var location = new Location
        {
            Name = req.Name.Trim(),
            Coord = req.Coord,
            CreatedUtc = DateTime.UtcNow
        };

        try
        {
            await _locations.CreateAsync(location);
        }
        catch (MongoWriteException ex) when (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
        {
            return Conflict("Coord must be unique");
        }
        catch (MongoWriteException ex) when (ex.WriteError.Code == 121)
        {
            return BadRequest("Location document failed validation");
        }

        return Ok(location);
    }

    [HttpGet]
    [Authorize(Roles = "SUPER")]
    public async Task<IActionResult> ListMine()
    {
        var locations = await _locations.GetAllAsync();
        return Ok(locations);
    }

    [HttpDelete("{id}")]
    [Authorize(Roles = "SUPER")]
    public async Task<IActionResult> Delete(string id)
    {
        var deleted = await _locations.DeleteAsync(id);
        if (!deleted)
            return NotFound();

        return Ok("Deleted");
    }

    [HttpPut("{id}")]
    [Authorize(Roles = "SUPER")]
    public async Task<IActionResult> Update(string id, [FromBody] UpdateLocationRequest req)
    {
        if (string.IsNullOrWhiteSpace(req.Name))
            return BadRequest("Name required");

        if (req.Coord is not null)
            return BadRequest("Coord cannot be updated");

        var updated = await _locations.UpdateNameAsync(id, req.Name.Trim());
        if (!updated)
            return NotFound();

        return Ok("Updated");
    }

    [HttpPost("{id}/interact")]
    [Authorize(Roles = "USER,SUPER")]
    public async Task<IActionResult> Interact(string id, [FromBody] InteractLocationObjectRequest req)
    {
        if (string.IsNullOrWhiteSpace(req.CharacterId))
            return BadRequest("characterId required");
        if (string.IsNullOrWhiteSpace(req.ObjectId))
            return BadRequest("objectId required");

        var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
        if (string.IsNullOrWhiteSpace(userId))
            return Unauthorized();

        var allowAnyOwner = User.IsInRole("SUPER");
        var interact = await _locations.InteractWithObjectAsync(id, req.CharacterId, req.ObjectId, userId, allowAnyOwner);
        if (interact.Status == InteractStatus.LocationNotFound)
            return NotFound("Location not found");
        if (interact.Status == InteractStatus.CharacterNotFound)
            return NotFound("Character not found");
        if (interact.Status == InteractStatus.Forbidden)
            return Forbid();
        if (interact.Status == InteractStatus.Invalid)
            return BadRequest("Character is not at the target location");
        if (interact.Status == InteractStatus.ObjectNotFound)
            return NotFound("Location object not found");
        if (interact.Status == InteractStatus.UnsupportedObjectType)
            return BadRequest("Location object type is not supported");
        if (interact.Status == InteractStatus.ObjectConsumed)
            return Conflict("Location object is consumed");

        var inventoryBaseUrl = (_configuration["Services:InventoryApiBaseUrl"] ?? "http://localhost:5003").TrimEnd('/');
        var token = Request.Headers.Authorization.ToString();
        var grantBody = JsonSerializer.Serialize(new
        {
            itemKey = interact.ItemKey,
            quantity = interact.QuantityGranted
        });

        var client = _httpClientFactory.CreateClient();
        using var request = new HttpRequestMessage(
            HttpMethod.Post,
            $"{inventoryBaseUrl}/api/inventory/by-owner/character/{req.CharacterId}/grant");
        request.Content = new StringContent(grantBody, Encoding.UTF8, "application/json");
        if (!string.IsNullOrWhiteSpace(token))
            request.Headers.Authorization = AuthenticationHeaderValue.Parse(token);

        HttpResponseMessage response;
        try
        {
            response = await client.SendAsync(request);
        }
        catch (HttpRequestException ex)
        {
            if (interact.PreviousObject is not null)
                await _locations.RestoreObjectInteractionAsync(id, interact.PreviousObject);

            _logger.LogError(
                ex,
                "Failed to reach InventoryApi while processing location interaction for location {LocationId}, character {CharacterId}, object {ObjectId}",
                id,
                req.CharacterId,
                req.ObjectId
            );

            return StatusCode(StatusCodes.Status502BadGateway, new
            {
                type = "https://httpstatuses.com/502",
                title = "Bad Gateway",
                status = 502,
                detail = $"Failed to reach InventoryApi at {inventoryBaseUrl}.",
                traceId = HttpContext.TraceIdentifier
            });
        }

        using (response)
        {
            var responseBody = await response.Content.ReadAsStringAsync();
            if (!response.IsSuccessStatusCode)
            {
                if (interact.PreviousObject is not null)
                    await _locations.RestoreObjectInteractionAsync(id, interact.PreviousObject);
                return StatusCode((int)response.StatusCode, responseBody);
            }

            return Ok(new InteractLocationObjectResponse
            {
                LocationId = id,
                CharacterId = req.CharacterId,
                ObjectId = interact.ObjectId,
                ObjectType = interact.ObjectType,
                ItemKey = interact.ItemKey,
                QuantityGranted = interact.QuantityGranted,
                RemainingQuantity = interact.RemainingQuantity,
                Consumed = interact.Consumed,
                InventoryResponseJson = responseBody
            });
        }
    }
}