<script lang="ts">
  import { Input } from '$lib/components/ui/input'
  import { Label } from '$lib/components/ui/label'
  import { Button } from '$lib/components/ui/button'
  import { Separator } from '$lib/components/ui/separator'
  import { Lock, LogIn, Server } from '@lucide/svelte'
  import { fetchWithAuth, setConfig, initConfig, getConfig, clearConfig } from '$lib/config'
  import { startLogin, logout as oidcLogout, getUser, isOIDCConfigured } from '$lib/oidc'
  import ConfigBackground from '$lib/components/ConfigBackground.svelte'
  import type { WailsGlobal } from '$lib/types'

  let { onConnected, onCancel }: { onConnected: () => void; onCancel?: () => void } = $props()

  const existing = getConfig()
  let apiUrl = $state(existing.apiUrl ?? '')
  let token = $state(existing.token ?? '')
  let connecting = $state(false)
  let error = $state('')
  let oidcLoggingIn = $state(false)
  let oidcUser = $state(getUser())
  let oidcConfigured = $state(isOIDCConfigured())

  function disconnect() {
    clearConfig()
    oidcLogout()
    apiUrl = ''
    token = ''
    error = ''
    oidcUser = null
    oidcConfigured = false
  }

  async function connect() {
    error = ''
    if (!token.trim()) {
      error = 'Token is required'
      return
    }
    connecting = true
    setConfig({ apiUrl: apiUrl.trim(), token: token.trim() })
    initConfig({ apiUrl: apiUrl.trim(), token: token.trim() })
    try {
      const res = await fetchWithAuth('/api/v1/dashboard/summary')
      if (!res.ok) {
        error = res.status === 401 ? 'Invalid token' : `Server responded ${res.status}`
        return
      }
      saveToDesktop()
      onConnected()
    } catch {
      error = 'Could not reach server — check the URL'
    } finally {
      connecting = false
    }
  }

  function saveToDesktop() {
    const wails = (window as unknown as { wails?: WailsGlobal }).wails
    if (!wails?.Call?.ByName) return
    try {
      wails.Call.ByName('SaveConfig', apiUrl.trim(), token.trim())
    } catch {
      // optional desktop-only path
    }
  }

  async function loginWithAuthentik() {
    error = ''
    oidcLoggingIn = true
    setConfig({ apiUrl: apiUrl.trim(), token: '' })
    initConfig({ apiUrl: apiUrl.trim(), token: '' })

    try {
      await startLogin()
    } catch (e: unknown) {
      error = e instanceof Error ? e.message : 'OIDC login failed'
      oidcLoggingIn = false
    }
  }

  function logoutOIDC() {
    oidcLogout()
    oidcUser = null
    oidcConfigured = false
  }

  // OIDC callback state: user just returned from Authentik
  let showOidcContinue = $derived(oidcConfigured && oidcUser)
</script>

<div class="relative h-svh overflow-hidden bg-background">
  <ConfigBackground />

  <div class="relative z-10 flex h-full items-center justify-center p-6">
    <div class="w-full max-w-[26rem] space-y-8 rounded-2xl border border-white/8 bg-card/60 p-8 shadow-2xl shadow-black/40 backdrop-blur-xl">

      <!-- Logo + heading -->
      <div class="flex flex-col items-center gap-4">
        <svg viewBox="0 0 91 100" class="h-16 w-16 fill-white/90" aria-hidden="true">
          <path d="m45.601 1q20.993 0 33.71 15.946 10.799 13.625 10.799 31.287 0 12.414-5.9548 25.131-5.9548 12.717-16.451 19.176-10.395 6.4592-23.213 6.4592-20.892 0-33.205-16.653-10.395-14.029-10.395-31.489 0-12.717 6.2577-25.232 6.3584-12.616 16.653-18.57 10.295-6.0556 21.801-6.0556zm-3.128 6.5605q-5.3492 0-10.799 3.2296-5.3492 3.1287-8.68 11.102-3.3305 7.9735-3.3305 20.488 0 20.185 7.973 34.82 8.0743 14.634 21.195 14.634 9.7896 0 16.149-8.0743 6.3584-8.0743 6.3584-27.755 0-24.627-10.597-38.756-7.1657-9.6888-18.268-9.6888z" />
        </svg>
        <div class="text-center">
          <h1 class="text-2xl font-semibold tracking-tight text-foreground">Connect to Oikos</h1>
          <p class="mt-1.5 text-sm text-muted-foreground">Configure your control room connection</p>
        </div>
      </div>

      <!-- Server URL -->
      <div class="flex flex-col gap-1.5">
        <Label for="server-url" class="text-xs font-medium">Server URL</Label>
        <div class="relative">
          <Server class="pointer-events-none absolute left-3 top-1/2 size-4 -translate-y-1/2 text-muted-foreground/50" />
          <Input
            id="server-url"
            type="url"
            placeholder="https://oikos.hubris.network"
            class="pl-9"
            bind:value={apiUrl}
          />
        </div>
      </div>

      {#if showOidcContinue}
        <!-- OIDC authenticated state -->
        <div class="flex flex-col items-center gap-3 rounded-xl border border-white/5 bg-background/40 p-5">
          <p class="text-sm text-muted-foreground">
            Logged in as <span class="font-semibold text-foreground">{oidcUser}</span>
          </p>
          <div class="flex w-full gap-2">
            <Button type="button" variant="default" class="flex-1" onclick={() => onConnected()}>
              Continue to Dashboard
            </Button>
            {#if onCancel}
              <Button type="button" variant="outline" onclick={onCancel}>Cancel</Button>
            {/if}
          </div>
          <Button type="button" variant="ghost" size="sm" onclick={logoutOIDC}>
            Sign out
          </Button>
        </div>
      {:else}
        <!-- Auth options: Authentik + token -->
        <div class="flex w-full flex-col gap-3">
          <!-- Authentik row -->
          <Button
            type="button"
            variant="secondary"
            disabled={oidcLoggingIn}
            onclick={loginWithAuthentik}
            class="w-full gap-2"
          >
            <LogIn class="size-4" />
            {oidcLoggingIn ? 'Redirecting…' : 'Login with Authentik'}
          </Button>

          <div class="flex items-center gap-3">
            <Separator decorative class="flex-1" />
            <span class="text-[10px] font-medium uppercase tracking-widest text-muted-foreground/40">or use</span>
            <Separator decorative class="flex-1" />
          </div>

          <!-- Token row -->
          <form
            class="flex flex-col gap-2.5"
            onsubmit={(e) => { e.preventDefault(); connect() }}
          >
            <div class="relative">
              <Lock class="pointer-events-none absolute left-3 top-1/2 size-4 -translate-y-1/2 text-muted-foreground/50" />
              <Input
                type="password"
                placeholder="Bearer token"
                class="pl-9"
                bind:value={token}
              />
            </div>
            <Button type="submit" disabled={connecting} class="w-full">
              {connecting ? 'Connecting…' : 'Connect'}
            </Button>
          </form>
        </div>
      {/if}

      <!-- Error -->
      {#if error}
        <p class="rounded-lg bg-destructive/10 px-3 py-2 text-center text-sm text-destructive">{error}</p>
      {/if}

      <!-- Footer: cancel + forget -->
      {#if !showOidcContinue && (onCancel || existing.token)}
        <div class="flex items-center justify-center gap-2">
          {#if onCancel}
            <Button type="button" variant="ghost" size="sm" onclick={onCancel}>Cancel</Button>
          {/if}
          {#if existing.token}
            <Button type="button" variant="ghost" size="sm" onclick={disconnect}>
              Forget saved connection
            </Button>
          {/if}
        </div>
      {/if}
    </div>
  </div>
</div>
