using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RobotNet10.RobotApp.Data;
using RobotNet10.RobotApp.Shared.DockStation;
using RobotNet10.Shared.Enum;
using RobotNet10.Shared.Numbers;
using System.Text.Json;

namespace RobotNet10.RobotApp.Controllers;

[Route("api/dock-station-config")]
[ApiController]
[Authorize]
public class DockStationConfigController(ApplicationDbContext dbContext) : ControllerBase
{
    [HttpGet]
    public async Task<ActionResult<List<DockStationConfigSummaryDto>>> GetAll()
    {
        var configs = await dbContext.DockStationConfigs
            .Include(d => d.MarkerEntries)
            .OrderByDescending(d => d.UpdatedAt)
            .ToListAsync();

        return Ok(configs.Select(MapToSummaryDto).ToList());
    }

    [HttpGet("{id:guid}")]
    public async Task<ActionResult<DockStationConfigDto>> GetById(Guid id)
    {
        var config = await dbContext.DockStationConfigs
            .Include(d => d.MarkerEntries)
            .FirstOrDefaultAsync(d => d.Id == id);

        if (config is null) return NotFound();
        return Ok(MapToDto(config));
    }

    [HttpGet("station/{stationId}")]
    public async Task<ActionResult<DockStationConfigDto>> GetByStationId(string stationId)
    {
        var config = await dbContext.DockStationConfigs
            .Include(d => d.MarkerEntries)
            .FirstOrDefaultAsync(d => d.StationId == stationId);

        if (config is null) return NotFound();
        return Ok(MapToDto(config));
    }

    [HttpPost]
    public async Task<ActionResult<DockStationConfigDto>> Create(
        [FromBody] CreateDockStationConfigRequest request)
    {
        if (await dbContext.DockStationConfigs.AnyAsync(d => d.StationId == request.StationId))
            return BadRequest($"StationId '{request.StationId}' already exists.");

        var entity = new DockStationConfig
        {
            StationId = request.StationId,
            ConfigName = request.ConfigName ?? string.Empty,
            Description = request.Description ?? string.Empty,
            X = request.X,
            Y = request.Y,
            Yaw = request.Yaw,
            Width = request.Width,
            Length = request.Length,
            IsActive = request.IsActive,
            CreatedAt = DateTime.UtcNow,
            UpdatedAt = DateTime.UtcNow,
            MarkerEntries = request.MarkerEntries.Select(MapFromEntryDto).ToList()
        };

        dbContext.DockStationConfigs.Add(entity);
        await dbContext.SaveChangesAsync();

        return CreatedAtAction(nameof(GetById), new { id = entity.Id }, MapToDto(entity));
    }

    [HttpPut("{id:guid}")]
    public async Task<ActionResult<DockStationConfigDto>> Update(
        Guid id, [FromBody] UpdateDockStationConfigRequest request)
    {
        var entity = await dbContext.DockStationConfigs
            .Include(d => d.MarkerEntries)
            .FirstOrDefaultAsync(d => d.Id == id);

        if (entity is null) return NotFound();

        if (request.StationId is not null)
        {
            if (request.StationId != entity.StationId &&
                await dbContext.DockStationConfigs.AnyAsync(d => d.StationId == request.StationId))
                return BadRequest($"StationId '{request.StationId}' already exists.");
            entity.StationId = request.StationId;
        }
        if (request.ConfigName is not null) entity.ConfigName = request.ConfigName;
        if (request.Description is not null) entity.Description = request.Description;
        if (request.X.HasValue) entity.X = request.X.Value;
        if (request.Y.HasValue) entity.Y = request.Y.Value;
        if (request.Yaw.HasValue) entity.Yaw = request.Yaw.Value;
        if (request.Width.HasValue) entity.Width = request.Width.Value;
        if (request.Length.HasValue) entity.Length = request.Length.Value;
        if (request.IsActive.HasValue) entity.IsActive = request.IsActive.Value;
        entity.UpdatedAt = DateTime.UtcNow;

        if (request.MarkerEntries is not null)
        {
            dbContext.DockStationMarkerEntries.RemoveRange(entity.MarkerEntries);
            entity.MarkerEntries = request.MarkerEntries.Select(MapFromEntryDto).ToList();
        }

        await dbContext.SaveChangesAsync();
        return Ok(MapToDto(entity));
    }

    [HttpDelete("{id:guid}")]
    public async Task<IActionResult> Delete(Guid id)
    {
        var entity = await dbContext.DockStationConfigs.FindAsync(id);
        if (entity is null) return NotFound();

        dbContext.DockStationConfigs.Remove(entity);
        await dbContext.SaveChangesAsync();
        return NoContent();
    }

    #region Mapping Helpers

    private static DockStationConfigDto MapToDto(DockStationConfig entity) => new()
    {
        Id = entity.Id,
        StationId = entity.StationId,
        ConfigName = entity.ConfigName,
        Description = entity.Description,
        X = entity.X,
        Y = entity.Y,
        Yaw = entity.Yaw,
        Width = entity.Width,
        Length = entity.Length,
        CreatedAt = entity.CreatedAt,
        UpdatedAt = entity.UpdatedAt,
        IsActive = entity.IsActive,
        MarkerEntries = entity.MarkerEntries?.Select(MapToEntryDto).ToList() ?? []
    };

    private static DockStationConfigSummaryDto MapToSummaryDto(DockStationConfig entity) => new()
    {
        Id = entity.Id,
        StationId = entity.StationId,
        ConfigName = entity.ConfigName,
        Description = entity.Description,
        IsActive = entity.IsActive,
        MarkerEntryCount = entity.MarkerEntries?.Count ?? 0,
        CreatedAt = entity.CreatedAt,
        UpdatedAt = entity.UpdatedAt
    };

    private static DockStationMarkerEntryDto MapToEntryDto(DockStationMarkerEntry entity) => new()
    {
        Id = entity.Id,
        MarkerId = entity.MarkerId,
        Type = (MarkerType)entity.Type,
        Priority = entity.Priority,
        DeviceId = entity.DeviceId,
        Code = entity.Code,
        ReferencePoints = DeserializeReferencePoints(entity.ReferencePointsJson)
    };

    private static DockStationMarkerEntry MapFromEntryDto(DockStationMarkerEntryDto dto) => new()
    {
        MarkerId = dto.MarkerId,
        Type = (int)dto.Type,
        Priority = dto.Priority,
        DeviceId = dto.DeviceId ?? string.Empty,
        Code = dto.Code ?? string.Empty,
        ReferencePointsJson = JsonSerializer.Serialize(dto.ReferencePoints ?? [])
    };

    private static List<Vector2> DeserializeReferencePoints(string? json)
    {
        if (string.IsNullOrWhiteSpace(json)) return [];
        try { return JsonSerializer.Deserialize<List<Vector2>>(json) ?? []; }
        catch { return []; }
    }

    #endregion
}