using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using RobotNet10.MapEditor.Shared.DTOs.Edge;
using RobotNet10.MapEditor.Shared.DTOs.Node;
using RobotNet10.MapEditor.Shared.DTOs.Requests;
using RobotNet10.MapEditor.Shared.DTOs.Responses;
using RobotNet10.MapManager.Services;
using System.Text.Json;

namespace RobotNet10.MapManager.Controllers;

/// <summary>
/// Controller for managing edges with complex node detection and cascade delete logic
/// </summary>
[ApiController]
[Route("api/edges")]
[Authorize]
public class EdgesController(
    IEdgeService edgeService,
    ILogger<EdgesController> logger) : ControllerBase
{
    private readonly IEdgeService _edgeService = edgeService;
    private readonly ILogger<EdgesController> _logger = logger;

    /// <summary>
    /// Get all edges for a layout level
    /// </summary>
    /// <param name="layoutLevelId">Layout level ID</param>
    /// <returns>List of edges with nodes and vehicle properties</returns>
    [HttpGet("level/{layoutLevelId}")]
    [ProducesResponseType(typeof(List<EdgeDto>), 200)]
    public async Task<ActionResult<List<EdgeDto>>> GetEdgesByLevel(Guid layoutLevelId)
    {
        var edges = await _edgeService.GetEdgesByLevelAsync(layoutLevelId, includeNodes: true, includeVehicleProperties: true);
        var dtos = edges.Select(MapToDto).ToList();
        
        return Ok(dtos);
    }

    /// <summary>
    /// Get edge by ID
    /// </summary>
    /// <param name="edgeId">Edge database ID</param>
    /// <returns>Edge details with nodes and vehicle properties</returns>
    [HttpGet("{edgeId}")]
    [ProducesResponseType(typeof(EdgeDto), 200)]
    [ProducesResponseType(404)]
    public async Task<ActionResult<EdgeDto>> GetEdge(Guid edgeId)
    {
        var edge = await _edgeService.GetByIdAsync(edgeId, includeNodes: true, includeVehicleProperties: true);
        
        if (edge == null)
        {
            return NotFound(CreateErrorResponse($"Edge with ID '{edgeId}' not found", "EDGE_NOT_FOUND"));
        }

        return Ok(MapToDto(edge));
    }

    /// <summary>
    /// Create edge with automatic node detection/creation
    /// If start/end point is within NodeProximityRadius (default 0.35m) of existing node, connect to that node
    /// Otherwise, create new node at exact coordinates
    /// </summary>
    /// <param name="request">Edge creation request with coordinates in METERS</param>
    /// <returns>Created edge with connected nodes</returns>
    [HttpPost]
    [ProducesResponseType(typeof(EdgeDto), 201)]
    [ProducesResponseType(400)]
    public async Task<ActionResult<EdgeDto>> CreateEdge([FromBody] CreateEdgeRequest request)
    {
        try
        {
            var edge = await _edgeService.CreateAsync(request);
            var dto = MapToDto(edge);
            
            return CreatedAtAction(
                nameof(GetEdge),
                new { edgeId = edge.Id },
                dto);
        }
        catch (InvalidOperationException ex)
        {
            _logger.LogWarning(ex, "Failed to create edge");
            return BadRequest(CreateErrorResponse(ex.Message, "VALIDATION_ERROR"));
        }
    }

    /// <summary>
    /// Update edge properties
    /// </summary>
    /// <param name="edgeId">Edge database ID</param>
    /// <param name="request">Update request</param>
    /// <returns>Updated edge</returns>
    [HttpPut("{edgeId}")]
    [ProducesResponseType(typeof(EdgeDto), 200)]
    [ProducesResponseType(400)]
    [ProducesResponseType(404)]
    public async Task<ActionResult<EdgeDto>> UpdateEdge(
        Guid edgeId,
        [FromBody] UpdateEdgeRequest request)
    {
        try
        {
            var edge = await _edgeService.UpdateAsync(edgeId, request);
            
            return Ok(MapToDto(edge));
        }
        catch (InvalidOperationException ex)
        {
            if(_logger.IsEnabled(LogLevel.Warning))_logger.LogWarning(ex, "Failed to update edge: {edgeId}", edgeId);
            
            if (ex.Message.Contains("not found"))
                return NotFound(CreateErrorResponse(ex.Message, "EDGE_NOT_FOUND"));

            return BadRequest(CreateErrorResponse(ex.Message, "VALIDATION_ERROR"));
        }
    }

    /// <summary>
    /// Delete edge
    /// Cascade deletes orphan nodes (nodes not connected to any other edge)
    /// Also deletes StationInteractionNodes referencing orphan nodes
    /// </summary>
    /// <param name="edgeId">Edge database ID</param>
    /// <returns>No content on success</returns>
    [HttpDelete("{edgeId}")]
    [ProducesResponseType(204)]
    [ProducesResponseType(404)]
    public async Task<IActionResult> DeleteEdge(Guid edgeId)
    {
        var deleted = await _edgeService.DeleteAsync(edgeId);
        
        if (!deleted)
        {
            return NotFound(CreateErrorResponse($"Edge with ID '{edgeId}' not found", "EDGE_NOT_FOUND"));
        }

        return NoContent();
    }

    /// <summary>
    /// Delete multiple edges in a transaction
    /// All edges are deleted or none (transaction)
    /// Cascade deletes orphan nodes and StationInteractionNodes
    /// </summary>
    /// <param name="request">Batch delete request with edge IDs</param>
    /// <returns>No content on success</returns>
    [HttpDelete("batch")]
    [ProducesResponseType(204)]
    [ProducesResponseType(400)]
    public async Task<IActionResult> DeleteEdgesBatch([FromBody] DeleteEdgesRequest request)
    {
        if (request.EdgeIds == null || request.EdgeIds.Count == 0)
        {
            return BadRequest(CreateErrorResponse("No edge IDs provided", "VALIDATION_ERROR"));
        }

        try
        {
            await _edgeService.DeleteBatchAsync(request.EdgeIds);
            
            return NoContent();
        }
        catch (InvalidOperationException ex)
        {
            _logger.LogWarning(ex, "Failed to batch delete edges");
            return BadRequest(CreateErrorResponse(ex.Message, "VALIDATION_ERROR"));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to batch delete edges");
            return StatusCode(500, CreateErrorResponse("Internal server error while deleting edges", "INTERNAL_ERROR"));
        }
    }

    // Helper method to map entity to DTO
    private static EdgeDto MapToDto(Data.Edge edge)
    {
        return new EdgeDto
        {
            Id = edge.Id,
            LevelId = edge.LevelId,
            EdgeId = edge.EdgeId,
            EdgeName = edge.EdgeName,
            EdgeDescription = edge.EdgeDescription,
            StartNodeId = edge.StartNodeId,
            EndNodeId = edge.EndNodeId,
            StartNode = edge.StartNode != null ? new NodeDto
            {
                Id = edge.StartNode.Id,
                NodeId = edge.StartNode.NodeId,
                NodeName = edge.StartNode.NodeName,
                X = edge.StartNode.X,
                Y = edge.StartNode.Y
            } : null,
            EndNode = edge.EndNode != null ? new NodeDto
            {
                Id = edge.EndNode.Id,
                NodeId = edge.EndNode.NodeId,
                NodeName = edge.EndNode.NodeName,
                X = edge.EndNode.X,
                Y = edge.EndNode.Y
            } : null,
            VehicleProperties = edge.VehicleProperties?.Select(vp => new EdgeVehiclePropertyDto
            {
                Id = vp.Id,
                EdgeId = vp.EdgeId,
                VehicleTypeId = vp.VehicleTypeId,
                VehicleTypeIdString = vp.VehicleType?.VehicleTypeId,
                VehicleOrientation = vp.VehicleOrientation,
                OrientationType = vp.OrientationType,
                RotationAllowed = vp.RotationAllowed,
                RotationAtStartNodeAllowed = vp.RotationAtStartNodeAllowed,
                RotationAtEndNodeAllowed = vp.RotationAtEndNodeAllowed,
                MaxSpeed = vp.MaxSpeed,
                MaxRotationSpeed = vp.MaxRotationSpeed,
                MinHeight = vp.MinHeight,
                MaxHeight = vp.MaxHeight,
                LoadRestriction = (vp.LoadRestriction_Unloaded.HasValue || vp.LoadRestriction_Loaded.HasValue || !string.IsNullOrWhiteSpace(vp.LoadRestriction_LoadSetNames))
                    ? new LoadRestrictionDto
                    {
                        Unloaded = vp.LoadRestriction_Unloaded,
                        Loaded = vp.LoadRestriction_Loaded,
                        LoadSetNames = SafeDeserializeLoadSetNames(vp.LoadRestriction_LoadSetNames)
                    }
                    : null,
                TrajectoryDegree = vp.TrajectoryDegree,
                TrajectoryControlPoint1X = vp.TrajectoryControlPoint1X,
                TrajectoryControlPoint1Y = vp.TrajectoryControlPoint1Y,
                TrajectoryControlPoint2X = vp.TrajectoryControlPoint2X,
                TrajectoryControlPoint2Y = vp.TrajectoryControlPoint2Y,
                CorridorLeftWidth = vp.CorridorLeftWidth,
                CorridorRightWidth = vp.CorridorRightWidth,
                CorridorRefPoint = vp.CorridorRefPoint
            }).ToList()
        };
    }

    private static List<string>? SafeDeserializeLoadSetNames(string? json)
    {
        if (string.IsNullOrWhiteSpace(json)) return null;
        try { return System.Text.Json.JsonSerializer.Deserialize<List<string>>(json); }
        catch (System.Text.Json.JsonException) { return null; }
    }

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