import { describe, it, expect } from 'vitest'
import { createNetSimulation } from '../src/scene/net-scene.ts'
import { createWorld, addPlayer } from '../src/game/combat.ts'
import { LockstepSession } from '../src/net/lockstep.ts'

describe('net-scene lockstep integration', () => {
  it('detects inventory desyncs when one peer picks up an item', () => {
    // Setup identical honest and tampered simulations
    const worldA = createWorld(0, 0)
    addPlayer(worldA, 10, 0)
    
    // Create worldB identical to worldA
    const worldB = createWorld(0, 0)
    addPlayer(worldB, 10, 0)

    const options = {
      playerSpeed: 100, playerReach: 20, playerCooldownTicks: 10,
      playerDamage: 10, playerManaPerAttack: 0, respawnTicks: 10,
    }
    const terrain = { overlap: () => 0 }

    const simA = createNetSimulation(worldA, options, terrain, [0, 100], 2)
    const simB = createNetSimulation(worldB, options, terrain, [0, 100], 2)

    // BOTH have an item at the same coordinate.
    // However, A has Gold, B has a Potion.
    simA.ground.push({ x: 0, y: 0, item: { name: 'Gold', stack: 100, value: 100, base: {} as unknown as import('../src/game/items.ts').ItemBase, prefix: null, suffix: null, level: 1, invWidth: 1, invHeight: 1, stats: {} } })
    simB.ground.push({ x: 0, y: 0, item: { name: 'Potion', stack: 1, value: 5, base: {} as unknown as import('../src/game/items.ts').ItemBase, prefix: null, suffix: null, level: 1, invWidth: 1, invHeight: 1, stats: {} } })

    const sessionA = new LockstepSession({ peers: 2, inputDelayTicks: 0 }, simA.simulation)
    const sessionB = new LockstepSession({ peers: 2, inputDelayTicks: 0 }, simB.simulation)

    // Tick 0: BOTH pick up!
    // At the end of the tick, both grounds are empty. But inventories differ.
    sessionA.submit(0, { tick: 0, movement: {x:0, y:0}, attack: false, pickup: true, talk: false, skill: 0 })
    sessionA.submit(1, { tick: 0, movement: {x:0, y:0}, attack: false, pickup: false, talk: false, skill: 0 })
    
    sessionB.submit(0, { tick: 0, movement: {x:0, y:0}, attack: false, pickup: true, talk: false, skill: 0 })
    sessionB.submit(1, { tick: 0, movement: {x:0, y:0}, attack: false, pickup: false, talk: false, skill: 0 })

    const outA = sessionA.step()
    const outB = sessionB.step()
    
    expect(outA.kind).toBe('stepped')
    expect(outB.kind).toBe('stepped')
    if (outA.kind === 'stepped' && outB.kind === 'stepped') { expect(outA.hash).not.toBe(outB.hash) }
  })
})