using Fitness_core_BE.Interfaces;
using Fitness_core_BE.Models;
using Microsoft.EntityFrameworkCore;

namespace Fitness_core_BE.Repos
{
    public class AgentRepo : IAgentRepo
    {
        // Central: an agent authenticates via X-Api-Key alone, before any tenant is known.
        // See CentralDbContext.Agents for the full rationale.
        private readonly CentralDbContext _dbContext;

        public AgentRepo(CentralDbContext dbContext)
        {
            _dbContext = dbContext;
        }

        public async Task<Agent> AddAsync(Agent agent)
        {
            await _dbContext.Agents.AddAsync(agent);
            return agent;
        }

        public async Task<Agent?> GetByApiKeyHashAsync(string apiKeyHash)
        {
            return await _dbContext.Agents
                .FirstOrDefaultAsync(a => a.ApiKeyHash == apiKeyHash && a.IsActive == true);
        }

        public async Task<Agent?> GetByIdAsync(Guid agentId)
        {
            return await _dbContext.Agents
                .FirstOrDefaultAsync(a => a.AgentId == agentId);
        }

        public async Task<List<Agent>> GetByClientIdAsync(Guid clientId)
        {
            return await _dbContext.Agents
                .AsNoTracking()
                .Where(a => a.FKClientId == clientId)
                .OrderByDescending(a => a.CreatedAt)
                .ToListAsync();
        }

        public async Task UpdateLastSeenAsync(Guid agentId, DateTime seenAt)
        {
            var agent = await _dbContext.Agents.FirstOrDefaultAsync(a => a.AgentId == agentId);
            if (agent == null)
                return;

            agent.LastSeenAt = seenAt;
        }
    }
}