import { createServer } from 'http'
import express from 'express'
import { WebSocketServer } from 'ws'
import { fileURLToPath } from 'url'
import { dirname, join } from 'path'

// Import shared game logic
// We need to read it as a dynamic import since it uses ES modules
const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

// Inline the game state logic for the server (avoid complex ESM import from src/)
function createInitialState() {
    return {
        order: true,
        visuForm: false,
        visuStriscia: true,
        modalitaPartita: "3/5",
        sp: {
            striscia: { home: [0], guest: [0] },
            servHome: true,
            punt: { home: 0, guest: 0 },
            set: { home: 0, guest: 0 },
            nomi: { home: "Antoniana", guest: "Guest" },
            form: {
                home: ["1", "2", "3", "4", "5", "6"],
                guest: ["1", "2", "3", "4", "5", "6"],
            },
            storicoServizio: [],
        },
    }
}

function checkVittoria(state) {
    const puntHome = state.sp.punt.home
    const puntGuest = state.sp.punt.guest
    const setHome = state.sp.set.home
    const setGuest = state.sp.set.guest
    const totSet = setHome + setGuest
    let isSetDecisivo = false
    if (state.modalitaPartita === "2/3") {
        isSetDecisivo = totSet >= 2
    } else {
        isSetDecisivo = totSet >= 4
    }
    const punteggioVittoria = isSetDecisivo ? 15 : 25
    if (puntHome >= punteggioVittoria && puntHome - puntGuest >= 2) return true
    if (puntGuest >= punteggioVittoria && puntGuest - puntHome >= 2) return true
    return false
}

function applyAction(state, action) {
    const s = JSON.parse(JSON.stringify(state))
    switch (action.type) {
        case "incPunt": {
            const team = action.team
            if (checkVittoria(s)) break
            s.sp.storicoServizio.push({
                servHome: s.sp.servHome,
                cambioPalla: (team === "home" && !s.sp.servHome) || (team === "guest" && s.sp.servHome),
            })
            s.sp.punt[team]++
            if (team === "home") {
                s.sp.striscia.home.push(s.sp.punt.home)
                s.sp.striscia.guest.push(" ")
            } else {
                s.sp.striscia.guest.push(s.sp.punt.guest)
                s.sp.striscia.home.push(" ")
            }
            const cambioPalla = (team === "home" && !s.sp.servHome) || (team === "guest" && s.sp.servHome)
            if (cambioPalla) {
                s.sp.form[team].push(s.sp.form[team].shift())
            }
            s.sp.servHome = team === "home"
            break
        }
        case "decPunt": {
            if (s.sp.striscia.home.length > 1 && s.sp.storicoServizio.length > 0) {
                const tmpHome = s.sp.striscia.home.pop()
                s.sp.striscia.guest.pop()
                const statoServizio = s.sp.storicoServizio.pop()
                if (tmpHome === " ") {
                    s.sp.punt.guest--
                    if (statoServizio.cambioPalla) {
                        s.sp.form.guest.unshift(s.sp.form.guest.pop())
                    }
                } else {
                    s.sp.punt.home--
                    if (statoServizio.cambioPalla) {
                        s.sp.form.home.unshift(s.sp.form.home.pop())
                    }
                }
                s.sp.servHome = statoServizio.servHome
            }
            break
        }
        case "incSet": {
            const team = action.team
            if (s.sp.set[team] === 2) { s.sp.set[team] = 0 } else { s.sp.set[team]++ }
            break
        }
        case "cambiaPalla": {
            if (s.sp.punt.home === 0 && s.sp.punt.guest === 0) {
                s.sp.servHome = !s.sp.servHome
            }
            break
        }
        case "resetta": {
            s.visuForm = false
            s.sp.punt.home = 0
            s.sp.punt.guest = 0
            s.sp.form = {
                home: ["1", "2", "3", "4", "5", "6"],
                guest: ["1", "2", "3", "4", "5", "6"],
            }
            s.sp.striscia = { home: [0], guest: [0] }
            s.sp.storicoServizio = []
            break
        }
        case "toggleFormazione": { s.visuForm = !s.visuForm; break }
        case "toggleStriscia": { s.visuStriscia = !s.visuStriscia; break }
        case "toggleOrder": { s.order = !s.order; break }
        case "setNomi": {
            if (action.home !== undefined) s.sp.nomi.home = action.home
            if (action.guest !== undefined) s.sp.nomi.guest = action.guest
            break
        }
        case "setModalita": { s.modalitaPartita = action.modalita; break }
        case "setFormazione": {
            if (action.team && action.form) {
                s.sp.form[action.team] = [...action.form]
            }
            break
        }
        case "confermaCambi": {
            const team = action.team
            const cambi = action.cambi || []
            const form = s.sp.form[team].map((val) => String(val).trim())
            const formAggiornata = [...form]
            let valid = true
            for (const cambio of cambi) {
                const cin = (cambio.in || "").trim()
                const cout = (cambio.out || "").trim()
                if (!cin || !cout) continue
                if (!/^\d+$/.test(cin) || !/^\d+$/.test(cout)) { valid = false; break }
                if (cin === cout) { valid = false; break }
                if (formAggiornata.includes(cin)) { valid = false; break }
                if (!formAggiornata.includes(cout)) { valid = false; break }
                const idx = formAggiornata.findIndex((val) => String(val).trim() === cout)
                if (idx !== -1) { formAggiornata.splice(idx, 1, cin) }
            }
            if (valid) { s.sp.form[team] = formAggiornata }
            break
        }
        default: break
    }
    return s
}

// ——— Server Setup ———

const app = express()
const PORT = process.env.PORT || 3000

// Serve the Vite build output
app.use(express.static(join(__dirname, 'dist')))

// SPA fallback: serve index.html for all non-file routes
app.get('/{*splat}', (req, res) => {
    res.sendFile(join(__dirname, 'dist', 'index.html'))
})

const server = createServer(app)

// WebSocket server
const wss = new WebSocketServer({ server })

// Global game state
let gameState = createInitialState()

// Track client roles
const clients = new Map() // ws -> { role: 'display' | 'controller' }

wss.on('connection', (ws) => {
    console.log('New WebSocket connection')

    ws.on('message', (data) => {
        try {
            const msg = JSON.parse(data.toString())

            if (msg.type === 'register') {
                clients.set(ws, { role: msg.role || 'display' })
                console.log(`Client registered as: ${msg.role || 'display'}`)
                // Send current state immediately
                ws.send(JSON.stringify({ type: 'state', state: gameState }))
                return
            }

            if (msg.type === 'action') {
                // Only controllers can send actions
                const client = clients.get(ws)
                if (!client || client.role !== 'controller') {
                    console.log('Action rejected: not a controller')
                    return
                }

                // Apply the action to game state
                gameState = applyAction(gameState, msg.action)

                // Broadcast new state to ALL connected clients
                const stateMsg = JSON.stringify({ type: 'state', state: gameState })
                wss.clients.forEach((c) => {
                    if (c.readyState === 1) { // WebSocket.OPEN
                        c.send(stateMsg)
                    }
                })
            }
        } catch (err) {
            console.error('Error processing message:', err)
        }
    })

    ws.on('close', () => {
        clients.delete(ws)
        console.log('Client disconnected')
    })
})

server.listen(PORT, '0.0.0.0', () => {
    console.log(`\n🏐 Segnapunti Server running on:`)
    console.log(`   Display:    http://localhost:${PORT}/`)
    console.log(`   Controller: http://localhost:${PORT}/controller`)
    console.log(`\n   Per accedere da altri dispositivi sulla rete locale,`)
    console.log(`   usa l'IP di questo computer, es: http://192.168.1.x:${PORT}/controller\n`)
})