import { useEffect, useState } from "react"
import { createRoot } from "react-dom/client"
import { invoke } from "@tauri-apps/api/core"
import { Store } from "@tauri-apps/plugin-store"
import { ExternalLink, Eye, EyeOff, GalleryVerticalEnd, RefreshCw } from "lucide-react"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "./components/ui/tabs"
import { cn } from "./lib/utils"

type MachineOs = {
  name: string
  version?: string | null
  architecture?: string | null
}

type MachineMetrics = {
  collectedAt: string
  cpuLogicalCores: number
  cpuPhysicalCores?: number | null
  cpuUsagePercent: number
  memoryTotalBytes: number
  memoryUsedBytes: number
  memoryUsedPercent: number
  uptimeSeconds: number
}

type MachineInventory = {
  cpuBrand?: string | null
  hostIdentifier?: string | null
}

type MachineProfile = {
  hostname: string
  os: MachineOs
  macAddresses: string[]
  serialNumbers: string[]
  inventory: MachineInventory
  metrics: MachineMetrics
}

type MachineRegisterResponse = {
  machineId: string
  tenantId?: string | null
  companyId?: string | null
  companySlug?: string | null
  machineToken: string
  machineEmail?: string | null
  expiresAt?: number | null
}

type AgentConfig = {
  machineId: string
  tenantId?: string | null
  companySlug?: string | null
  machineEmail?: string | null
  apiBaseUrl: string
  appUrl: string
  createdAt: number
  lastSyncedAt?: number | null
  expiresAt?: number | null
  heartbeatIntervalSec?: number | null
}

declare global {
  interface ImportMetaEnv {
    readonly VITE_APP_URL?: string
    readonly VITE_API_BASE_URL?: string
  }
  interface ImportMeta { readonly env: ImportMetaEnv }
}

const STORE_FILENAME = "machine-agent.json"
const DEFAULT_APP_URL = import.meta.env.MODE === "production" ? "https://tickets.esdrasrenan.com.br" : "http://localhost:3000"

function normalizeUrl(value?: string | null, fallback = DEFAULT_APP_URL) {
  const trimmed = (value ?? fallback).trim()
  if (!trimmed.startsWith("http")) return fallback
  return trimmed.replace(/\/+$/, "")
}

const appUrl = normalizeUrl(import.meta.env.VITE_APP_URL, DEFAULT_APP_URL)
const apiBaseUrl = normalizeUrl(import.meta.env.VITE_API_BASE_URL, appUrl)

async function loadStore(): Promise<Store> {
  return await Store.load(STORE_FILENAME)
}

async function readToken(store: Store): Promise<string | null> {
  return (await store.get<string>("token")) ?? null
}

async function writeToken(store: Store, token: string): Promise<void> {
  await store.set("token", token)
  await store.save()
}

async function readConfig(store: Store): Promise<AgentConfig | null> {
  return (await store.get<AgentConfig>("config")) ?? null
}

async function writeConfig(store: Store, cfg: AgentConfig): Promise<void> {
  await store.set("config", cfg)
  await store.save()
}

function bytes(n?: number) {
  if (!n || !Number.isFinite(n)) return "—"
  const u = ["B","KB","MB","GB","TB"]
  let v = n; let i = 0
  while (v >= 1024 && i < u.length - 1) { v/=1024; i++ }
  return `${v.toFixed(v>=10||i===0?0:1)} ${u[i]}`
}

function pct(p?: number) { return !p && p !== 0 ? "—" : `${p.toFixed(0)}%` }

function App() {
  const [store, setStore] = useState<Store | null>(null)
  const [token, setToken] = useState<string | null>(null)
  const [config, setConfig] = useState<AgentConfig | null>(null)
  const [profile, setProfile] = useState<MachineProfile | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [busy, setBusy] = useState(false)
  const [status, setStatus] = useState<string | null>(null)
  const [showSecret, setShowSecret] = useState(false)

  const [provisioningSecret, setProvisioningSecret] = useState("")
  const [tenantId, setTenantId] = useState("")
  const [company, setCompany] = useState("")
  const [collabEmail, setCollabEmail] = useState("")
  const [collabName, setCollabName] = useState("")
  const [updating, setUpdating] = useState(false)

  useEffect(() => {
    (async () => {
      try {
        const s = await loadStore()
        setStore(s)
        const t = await readToken(s)
        setToken(t)
        const cfg = await readConfig(s)
        setConfig(cfg)
        if (!t) {
          const p = await invoke<MachineProfile>("collect_machine_profile")
          setProfile(p)
        }
        setStatus(t ? "online" : null)
      } catch (err) {
        setError("Falha ao carregar estado do agente.")
      }
    })()
  }, [])

  async function register() {
    if (!profile) return
    if (!provisioningSecret.trim()) { setError("Informe o código de provisionamento."); return }
    setBusy(true); setError(null)
    try {
      const payload = {
        provisioningSecret: provisioningSecret.trim(),
        tenantId: tenantId.trim() || undefined,
        companySlug: company.trim() || undefined,
        hostname: profile.hostname,
        os: profile.os,
        macAddresses: profile.macAddresses,
        serialNumbers: profile.serialNumbers,
        metadata: { inventory: profile.inventory, metrics: profile.metrics, collaborator: collabEmail ? { email: collabEmail.trim(), name: collabName.trim() || undefined } : undefined },
        registeredBy: "desktop-agent",
      }
      const res = await fetch(`${apiBaseUrl}/api/machines/register`, { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify(payload) })
      if (!res.ok) {
        const text = await res.text()
        throw new Error(`Falha no registro (${res.status}): ${text.slice(0,300)}`)
      }
      const data = (await res.json()) as MachineRegisterResponse
      if (!store) throw new Error("Store ausente")
      await writeToken(store, data.machineToken)
      const cfg: AgentConfig = {
        machineId: data.machineId,
        tenantId: data.tenantId ?? null,
        companySlug: data.companySlug ?? null,
        machineEmail: data.machineEmail ?? null,
        apiBaseUrl,
        appUrl,
        createdAt: Date.now(),
        lastSyncedAt: Date.now(),
        expiresAt: data.expiresAt ?? null,
      }
      await writeConfig(store, cfg)
      setConfig(cfg); setToken(data.machineToken)
      await invoke("start_machine_agent", { baseUrl: apiBaseUrl, token: data.machineToken, status: "online", intervalSeconds: 300 })
      setStatus("online")
    } catch (err) {
      setError(err instanceof Error ? err.message : String(err))
    } finally {
      setBusy(false)
    }
  }

  async function openSystem() {
    if (!token || !config) return
    const url = `${config.appUrl}/machines/handshake?token=${encodeURIComponent(token)}`
    try {
      // open in default browser; fallback to in-webview
      const { openUrl } = await import("@tauri-apps/plugin-opener")
      await openUrl(url)
    } catch {
      window.location.replace(url)
    }
  }

  async function reprovision() {
    if (!store) return
    await store.delete("token"); await store.delete("config"); await store.save()
    setToken(null); setConfig(null); setStatus(null)
    const p = await invoke<MachineProfile>("collect_machine_profile")
    setProfile(p)
  }

  async function sendInventoryNow() {
    if (!token || !profile) return
    setBusy(true); setError(null)
    try {
      const payload = {
        machineToken: token,
        hostname: profile.hostname,
        os: profile.os,
        metrics: profile.metrics,
        inventory: profile.inventory,
      }
      const res = await fetch(`${apiBaseUrl}/api/machines/inventory`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload),
      })
      if (!res.ok) {
        const text = await res.text()
        throw new Error(`Falha ao enviar inventário (${res.status}): ${text.slice(0, 200)}`)
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : String(err))
    } finally {
      setBusy(false)
    }
  }

  async function checkForUpdates() {
    try {
      setUpdating(true)
      const { check } = await import("@tauri-apps/plugin-updater")
      const update = await check()
      if (update && (update as any).available) {
        // download and install then relaunch
        await (update as any).downloadAndInstall()
        const { relaunch } = await import("@tauri-apps/plugin-process")
        await relaunch()
      } else {
        alert("Nenhuma atualização disponível.")
      }
    } catch (error) {
      console.error("Falha ao verificar atualizações", error)
      alert("Falha ao verificar atualizações.")
    } finally {
      setUpdating(false)
    }
  }

  return (
    <div className="min-h-screen grid place-items-center p-6">
      <div className="w-full max-w-[720px] rounded-2xl border border-slate-200 bg-white p-6 shadow-sm">
        <div className="mb-2 flex items-center justify-between gap-3">
          <div className="flex items-center gap-2 text-xl font-semibold text-neutral-900">
            <span className="flex size-6 items-center justify-center rounded-md bg-black text-white"><GalleryVerticalEnd className="size-4" /></span>
            Sistema de chamados
          </div>
          <StatusBadge status={status} />
        </div>
        <h1 className="text-base font-semibold text-slate-800">Agente Desktop</h1>
        {error ? <p className="mt-3 rounded-md bg-rose-50 p-2 text-sm text-rose-700">{error}</p> : null}
        {!token ? (
          <div className="mt-4 space-y-3">
            <p className="text-sm text-slate-600">Informe os dados para registrar esta máquina.</p>
            <div className="grid gap-2">
              <label className="text-sm font-medium">Código de provisionamento</label>
              <div className="relative">
                <input className="w-full rounded-lg border border-slate-300 px-3 py-2 pr-9 text-sm" type={showSecret?"text":"password"} value={provisioningSecret} onChange={(e)=>setProvisioningSecret(e.target.value)} />
                <button className="absolute right-2 top-1/2 -translate-y-1/2 p-1 text-slate-600" onClick={()=>setShowSecret((v)=>!v)} aria-label="Mostrar/ocultar">
                  {showSecret ? <EyeOff className="size-4"/> : <Eye className="size-4"/>}
                </button>
              </div>
            </div>
            <div className="grid gap-2">
              <label className="text-sm font-medium">Empresa (slug opcional)</label>
              <input className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm" placeholder="ex.: atlas-engenharia" value={company} onChange={(e)=>setCompany(e.target.value)} />
            </div>
            <div className="grid gap-2">
              <label className="text-sm font-medium">Colaborador (e-mail)</label>
              <input className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm" placeholder="colaborador@empresa.com" value={collabEmail} onChange={(e)=>setCollabEmail(e.target.value)} />
            </div>
            <div className="grid gap-2">
              <label className="text-sm font-medium">Nome do colaborador (opcional)</label>
              <input className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm" placeholder="Nome completo" value={collabName} onChange={(e)=>setCollabName(e.target.value)} />
            </div>
            <div className="grid gap-2">
              <label className="text-sm font-medium">Tenant (opcional)</label>
              <input className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm" placeholder="tenant-atlas" value={tenantId} onChange={(e)=>setTenantId(e.target.value)} />
            </div>
            {profile ? (
              <div className="mt-2 grid grid-cols-2 gap-2 rounded-lg border border-slate-200 bg-slate-50 p-3 text-xs">
                <div>
                  <div className="text-slate-500">Hostname</div>
                  <div className="font-medium text-slate-900">{profile.hostname}</div>
                </div>
                <div>
                  <div className="text-slate-500">Sistema</div>
                  <div className="font-medium text-slate-900">{profile.os.name}</div>
                </div>
                <div>
                  <div className="text-slate-500">CPU</div>
                  <div className="font-medium text-slate-900">{pct(profile.metrics.cpuUsagePercent)}</div>
                </div>
                <div>
                  <div className="text-slate-500">Memória</div>
                  <div className="font-medium text-slate-900">{bytes(profile.metrics.memoryUsedBytes)} / {bytes(profile.metrics.memoryTotalBytes)}</div>
                </div>
              </div>
            ) : null}
            <div className="mt-2 flex gap-2">
              <button disabled={busy} onClick={register} className="rounded-lg border border-black bg-black px-3 py-2 text-sm font-semibold text-white hover:bg-black/90 disabled:opacity-60">Registrar máquina</button>
            </div>
          </div>
        ) : (
          <div className="mt-4">
            <Tabs defaultValue="resumo" className="w-full">
              <TabsList className="h-10">
                <TabsTrigger value="resumo" className="rounded-lg px-3">Resumo</TabsTrigger>
                <TabsTrigger value="inventario" className="rounded-lg px-3">Inventário</TabsTrigger>
                <TabsTrigger value="diagnostico" className="rounded-lg px-3">Diagnóstico</TabsTrigger>
                <TabsTrigger value="config" className="rounded-lg px-3">Configurações</TabsTrigger>
              </TabsList>
              <TabsContent value="resumo" className="mt-4">
                <div className="grid gap-3 sm:grid-cols-2">
                  <div className="stat-card">
                    <div className="text-xs text-slate-500">CPU</div>
                    <div className="text-sm font-semibold text-slate-900">{profile ? pct(profile.metrics.cpuUsagePercent) : "—"}</div>
                  </div>
                  <div className="stat-card">
                    <div className="text-xs text-slate-500">Memória</div>
                    <div className="text-sm font-semibold text-slate-900">{profile ? `${bytes(profile.metrics.memoryUsedBytes)} / ${bytes(profile.metrics.memoryTotalBytes)}` : "—"}</div>
                  </div>
                </div>
                <div className="mt-4 flex gap-2">
                  <button onClick={openSystem} className="btn btn-primary inline-flex items-center gap-2">
                    <ExternalLink className="size-4"/> Abrir sistema
                  </button>
                  <button onClick={reprovision} className="btn btn-outline">Reprovisionar</button>
                </div>
              </TabsContent>
              <TabsContent value="inventario" className="mt-4 space-y-3">
                <p className="text-sm text-slate-600">Inventário básico coletado localmente. Envie para sincronizar com o servidor.</p>
                <div className="grid gap-2 sm:grid-cols-2">
                  <div className="card">
                    <div className="text-xs text-slate-500">Hostname</div>
                    <div className="text-sm font-semibold text-slate-900">{profile?.hostname ?? "—"}</div>
                  </div>
                  <div className="card">
                    <div className="text-xs text-slate-500">Sistema</div>
                    <div className="text-sm font-semibold text-slate-900">{profile?.os?.name ?? "—"} {profile?.os?.version ?? ""}</div>
                  </div>
                </div>
                <div className="flex gap-2">
                  <button disabled={busy} onClick={sendInventoryNow} className={cn("btn btn-primary", busy && "opacity-60")}>Enviar inventário agora</button>
                  <button onClick={openSystem} className="btn btn-outline">Ver no sistema</button>
                </div>
              </TabsContent>
              <TabsContent value="diagnostico" className="mt-4 space-y-2">
                <div className="card">
                  <p className="text-sm text-slate-700">Token armazenado: <span className="font-mono break-all text-xs">{token?.slice(0, 6)}…{token?.slice(-6)}</span></p>
                  <p className="text-sm text-slate-700">Base URL: <span className="font-mono text-xs">{apiBaseUrl}</span></p>
                </div>
              </TabsContent>
              <TabsContent value="config" className="mt-4 space-y-3">
                <div className="grid gap-2">
                  <label className="label">E-mail do colaborador (opcional)</label>
                  <input className="input" placeholder="colaborador@empresa.com" value={collabEmail} onChange={(e)=>setCollabEmail(e.target.value)} />
                </div>
                <div className="grid gap-2">
                  <label className="label">Nome do colaborador (opcional)</label>
                  <input className="input" placeholder="Nome completo" value={collabName} onChange={(e)=>setCollabName(e.target.value)} />
                </div>
                <div className="grid gap-2">
                  <label className="label">Atualizações</label>
                  <button onClick={checkForUpdates} disabled={updating} className={cn("btn btn-outline inline-flex items-center gap-2", updating && "opacity-60")}> 
                    <RefreshCw className="size-4" /> Verificar atualizações
                  </button>
                </div>
              </TabsContent>
            </Tabs>
          </div>
        )}
      </div>
        <div className="mt-6 flex justify-center">
          <img src={`${appUrl}/rever-8.png`} alt="Logotipo Rever Tecnologia" width={110} height={110} className="h-[3.45rem] w-auto" />
        </div>
      </div>
    </div>
  )
}

function StatusBadge({ status }: { status: string | null }) {
  const s = (status ?? "").toLowerCase()
  const label = s === "online" ? "Online" : s === "offline" ? "Offline" : s === "maintenance" ? "Manutenção" : "Sem status"
  const dot = s === "online" ? "bg-emerald-500" : s === "offline" ? "bg-rose-500" : s === "maintenance" ? "bg-amber-500" : "bg-slate-400"
  const ring = s === "online" ? "bg-emerald-400/30" : s === "offline" ? "bg-rose-400/30" : s === "maintenance" ? "bg-amber-400/30" : "bg-slate-300/30"
  const isOnline = s === "online"
  return (
    <span className="inline-flex h-8 items-center gap-4 rounded-full border border-slate-200 px-3 text-sm font-semibold">
      <span className="relative inline-flex items-center">
        <span className={cn("size-2 rounded-full", dot)} />
        {isOnline ? <span className={cn("absolute left-1/2 top-1/2 size-4 -translate-x-1/2 -translate-y-1/2 rounded-full animate-ping [animation-duration:2s]", ring)} /> : null}
      </span>
      {label}
    </span>
  )
}

const root = document.getElementById("root") || (() => { const el = document.createElement("div"); el.id = "root"; document.body.appendChild(el); return el })()
createRoot(root).render(<App />)