using Microsoft.EntityFrameworkCore;
using OtaFleet.Api.Data;
using OtaFleet.Api.Data.Entities;

namespace OtaFleet.Api.Endpoints;

public static class AdminEndpoints
{
    public static void MapAdminEndpoints(this IEndpointRouteBuilder app)
    {
        var group = app.MapGroup("/api/admin");

        // Vehicles
        group.MapGet("/vehicles", async (OtaDbContext db) =>
        {
            return await db.Vehicles.Include(v => v.Group).ToListAsync();
        });

        // Groups
        group.MapGet("/groups", async (OtaDbContext db) =>
        {
            return await db.VehicleGroups.Include(g => g.Vehicles).ToListAsync();
        });

        group.MapPost("/groups", async (OtaDbContext db, CreateGroupRequest request) =>
        {
            var group = new VehicleGroup
            {
                Name = request.Name,
                Description = request.Description
            };
            db.VehicleGroups.Add(group);
            await db.SaveChangesAsync();
            return Results.Created($"/api/admin/groups/{group.Id}", group);
        });

        group.MapPut("/groups/{id}", async (OtaDbContext db, int id, UpdateGroupRequest request) =>
        {
            var group = await db.VehicleGroups.FindAsync(id);
            if (group == null) return Results.NotFound();

            group.Name = request.Name;
            group.Description = request.Description;
            
            await db.SaveChangesAsync();
            return Results.Ok(group);
        });

        group.MapPost("/groups/{groupId}/vehicles", async (OtaDbContext db, int groupId, AssignVehicleRequest request) =>
        {
            var vehicle = await db.Vehicles.FindAsync(request.Vin);
            if (vehicle == null) return Results.NotFound("Vehicle not found");
            
            var group = await db.VehicleGroups.FindAsync(groupId);
            if (group == null) return Results.NotFound("Group not found");

            vehicle.GroupId = groupId;
            await db.SaveChangesAsync();
            return Results.Ok();
        });

        // Updates
        group.MapPost("/updates", async (OtaDbContext db, HttpRequest request) =>
        {
            if (!request.HasFormContentType)
                return Results.BadRequest("Expected multipart/form-data");

            var form = await request.ReadFormAsync();
            var file = form.Files["file"];
            var version = form["version"];
            var description = form["description"];

            if (file == null || file.Length == 0)
                return Results.BadRequest("No file uploaded");
            
            if (string.IsNullOrEmpty(version))
                return Results.BadRequest("Version is required");

            // Save file
            var uploadsDir = Path.Combine(Directory.GetCurrentDirectory(), "uploads");
            Directory.CreateDirectory(uploadsDir);
            var filePath = Path.Combine(uploadsDir, $"{version}_{file.FileName}");
            
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }

            var update = new FirmwareUpdate
            {
                Version = version!,
                Description = description,
                FilePath = filePath,
                UploadedAt = DateTime.UtcNow
            };
            
            db.FirmwareUpdates.Add(update);
            await db.SaveChangesAsync();
            
            return Results.Ok(update);
        });
        
        group.MapGet("/updates", async (OtaDbContext db) =>
        {
            return await db.FirmwareUpdates.OrderByDescending(u => u.UploadedAt).ToListAsync();
        });

        // Deployments
        group.MapPost("/deployments", async (OtaDbContext db, CreateDeploymentRequest request) =>
        {
            var update = await db.FirmwareUpdates.FindAsync(request.UpdateId);
            if (update == null) return Results.NotFound("Update not found");

            var deployment = new Deployment
            {
                UpdateId = request.UpdateId,
                TargetVin = request.TargetVin,
                TargetGroupId = request.TargetGroupId,
                Status = "Pending",
                CreatedAt = DateTime.UtcNow
            };
            
            db.Deployments.Add(deployment);
            await db.SaveChangesAsync();
            return Results.Created($"/api/admin/deployments/{deployment.Id}", deployment);
        });
        
        group.MapGet("/deployments", async (OtaDbContext db) =>
        {
            return await db.Deployments
                .Include(d => d.Update)
                .OrderByDescending(d => d.CreatedAt)
                .ToListAsync();
        });
    }
}

public record CreateGroupRequest(string Name, string? Description);
public record UpdateGroupRequest(string Name, string? Description);
public record AssignVehicleRequest(string Vin);
public record CreateDeploymentRequest(int UpdateId, string? TargetVin, int? TargetGroupId);