using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using RobotNet10.MapEditor.Shared.DTOs.LayoutData;
using RobotNet10.MapEditor.Shared.DTOs.Requests;
using RobotNet10.MapEditor.Shared.DTOs.Responses;
using RobotNet10.MapManager.Services;

namespace RobotNet10.MapManager.Controllers;

/// <summary>
/// Controller for retrieving complete layout data and merge/split operations
/// </summary>
[ApiController]
[Route("api/layout-data")]
[Authorize]
public class LayoutDataController(
    ILayoutDataService layoutDataService,
    ILogger<LayoutDataController> logger) : ControllerBase
{
    private readonly ILayoutDataService _layoutDataService = layoutDataService;
    private readonly ILogger<LayoutDataController> _logger = logger;

    /// <summary>
    /// Get complete layout data for a layout level
    /// Returns all nodes, edges, and stations with full nested properties
    /// </summary>
    /// <param name="layoutLevelId">Layout level ID</param>
    /// <returns>Complete layout data</returns>
    [HttpGet("{layoutLevelId}")]
    [ProducesResponseType(typeof(LayoutDataDto), 200)]
    public async Task<ActionResult<LayoutDataDto>> GetLayoutData(Guid layoutLevelId)
    {
        try
        {
            var data = await _layoutDataService.GetLayoutDataAsync(layoutLevelId);

            return Ok(data);
        }
        catch (Exception ex)
        {
            if (_logger.IsEnabled(LogLevel.Error)) _logger.LogError(ex, "Error retrieving layout data for level {LevelId}", layoutLevelId);
            return StatusCode(500, CreateErrorResponse("Internal server error while retrieving layout data", "INTERNAL_ERROR"));
        }
    }

    /// <summary>
    /// Merge multiple nodes into one node at center position
    /// </summary>
    /// <param name="request">Merge nodes request</param>
    /// <returns>Merge result with merged node, updated edges, and deleted node IDs</returns>
    [HttpPost("merge-nodes")]
    [ProducesResponseType(typeof(MergeNodesResponse), 200)]
    [ProducesResponseType(400)]
    public async Task<ActionResult<MergeNodesResponse>> MergeNodes([FromBody] MergeNodesRequest request)
    {
        try
        {
            var result = await _layoutDataService.MergeNodesAsync(request);
            return Ok(result);
        }
        catch (InvalidOperationException ex)
        {
            _logger.LogWarning(ex, "Failed to merge nodes");
            return BadRequest(CreateErrorResponse(ex.Message, "VALIDATION_ERROR"));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error merging nodes");
            return StatusCode(500, CreateErrorResponse("Internal server error while merging nodes", "INTERNAL_ERROR"));
        }
    }

    /// <summary>
    /// Split a node into multiple nodes (one for each connected edge)
    /// </summary>
    /// <param name="request">Split node request</param>
    /// <returns>Split result with new nodes, updated edges, and deleted node ID</returns>
    [HttpPost("split-node")]
    [ProducesResponseType(typeof(SplitNodeResponse), 200)]
    [ProducesResponseType(400)]
    public async Task<ActionResult<SplitNodeResponse>> SplitNode([FromBody] SplitNodeRequest request)
    {
        try
        {
            var result = await _layoutDataService.SplitNodeAsync(request);
            return Ok(result);
        }
        catch (InvalidOperationException ex)
        {
            _logger.LogWarning(ex, "Failed to split node");
            return BadRequest(CreateErrorResponse(ex.Message, "VALIDATION_ERROR"));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error splitting node");
            return StatusCode(500, CreateErrorResponse("Internal server error while splitting node", "INTERNAL_ERROR"));
        }
    }

    /// <summary>
    /// Save all layout changes (nodes and edges) in a batch operation
    /// Uses transaction to ensure atomicity
    /// </summary>
    /// <param name="request">Save request with nodes and edges to update</param>
    /// <returns>Save result with counts and any skipped items</returns>
    [HttpPost("save")]
    [ProducesResponseType(typeof(SaveLayoutDataResponse), 200)]
    [ProducesResponseType(400)]
    public async Task<ActionResult<SaveLayoutDataResponse>> SaveLayoutData([FromBody] SaveLayoutDataRequest request)
    {
        try
        {
            var result = await _layoutDataService.SaveLayoutDataAsync(request);

            if (!result.Success)
            {
                return BadRequest(result);
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error saving layout data");
            return StatusCode(500, CreateErrorResponse("Internal server error while saving layout data", "INTERNAL_ERROR"));
        }
    }

    /// <summary>
    /// Copy selected nodes and edges with an offset
    /// Creates new nodes and edges at offset positions
    /// </summary>
    /// <param name="request">Copy request with node IDs, edge IDs, and offset</param>
    /// <returns>Copy result with newly created nodes and edges</returns>
    [HttpPost("copy-nodes")]
    [ProducesResponseType(typeof(CopyNodesResponse), 200)]
    [ProducesResponseType(400)]
    public async Task<ActionResult<CopyNodesResponse>> CopyNodes([FromBody] CopyNodesRequest request)
    {
        try
        {
            var result = await _layoutDataService.CopyNodesAsync(request);

            if (!result.Success)
            {
                return BadRequest(result);
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error copying nodes");
            return StatusCode(500, CreateErrorResponse("Internal server error while copying nodes", "INTERNAL_ERROR"));
        }
    }

    private static ErrorResponseDto CreateErrorResponse(
        string error,
        string? errorCode = null,
        Dictionary<string, object>? details = null)
    {
        return new ErrorResponseDto
        {
            Error = error,
            ErrorCode = errorCode,
            Details = details
        };
    }
}