"use client"

import { useEffect, useRef, useState } from "react"
import { Icon } from "@iconify/react"
import { LandingReveal } from "@/components/landing/landing-reveal"
import { ProductSectionHeading } from "@/components/landing/product/product-section-heading"
import type { ProductCrossPlatformSection as ProductCrossPlatformSectionData } from "@/components/landing/product/product-data"
import {
  demoMailPreviewSrc,
  type DemoMailPreviewLayout,
} from "@/lib/demo/demo-mail-preview"
import {
  demoDriveLayoutPreviewSrc,
  type DemoDriveLayoutPreview,
} from "@/lib/demo/demo-drive-layout-preview"
import { ScaledPreviewIframe } from "@/components/landing/product/scaled-preview-iframe"
import { cn } from "@/lib/utils"

export type ProductCrossPlatformDemoApp = "mail" | "drive" | "meet"

type DeviceLayout = DemoMailPreviewLayout | DemoDriveLayoutPreview

const STAGE_DURATION_MS = 4200
/** Hauteur fixe du socle — évite le saut de layout entre mobile / tablette / bureau. */
const SHOWCASE_HEIGHT_PX = 620
/** Padding bezel DeviceShell (`p-2`). */
const DEVICE_BEZEL_PX = 8
const MONITOR_STAND_PX = 20

type DeviceStage = {
  id: DeviceLayout
  label: string
  platform: string
  icon: string
  /** Viewport logique rendu dans l'iframe (media queries Ultimail). */
  viewportWidth: number
  viewportHeight: number
  /** Largeur du cadre affiché sur la page (px). La hauteur est dérivée du ratio. */
  frameWidth: number
  radius: number
  notch?: boolean
  monitor?: boolean
}

const DEVICE_STAGES: DeviceStage[] = [
  {
    id: "phone",
    label: "Mobile",
    platform: "iOS & Android",
    icon: "mdi:cellphone",
    viewportWidth: 390,
    viewportHeight: 844,
    frameWidth: 264,
    radius: 40,
    notch: true,
  },
  {
    id: "tablet",
    label: "Tablette",
    platform: "iPad paysage",
    icon: "mdi:tablet",
    viewportWidth: 1024,
    viewportHeight: 768,
    frameWidth: 520,
    radius: 24,
  },
  {
    id: "desktop",
    label: "Bureau",
    platform: "Écran 4:3",
    icon: "mdi:monitor",
    viewportWidth: 1280,
    viewportHeight: 960,
    frameWidth: 640,
    radius: 12,
    monitor: true,
  },
]

function stageScale(stage: DeviceStage) {
  return stage.frameWidth / stage.viewportWidth
}

function statusBarHeight(stage: DeviceStage) {
  if (!stage.notch) return 0
  const scale = stageScale(stage)
  return Math.max(24, Math.round(32 * scale))
}

/** Hauteur de la zone iframe — ratio identique au viewport (aucune coupe). */
function contentAreaHeight(stage: DeviceStage) {
  return Math.round((stage.frameWidth * stage.viewportHeight) / stage.viewportWidth)
}

/** Hauteur totale du cadre = zone iframe + barre de statut éventuelle. */
function frameHeight(stage: DeviceStage) {
  return contentAreaHeight(stage) + statusBarHeight(stage)
}

function IosBatteryIcon({ size }: { size: number }) {
  const width = Math.round(size * 2.1)
  return (
    <svg
      width={width}
      height={size}
      viewBox="0 0 25 12"
      fill="none"
      aria-hidden
      className="shrink-0"
    >
      <rect
        x="0.5"
        y="0.5"
        width="21"
        height="11"
        rx="2.5"
        stroke="currentColor"
        strokeWidth="1"
      />
      <rect x="22.5" y="3.5" width="2" height="5" rx="0.75" fill="currentColor" opacity="0.35" />
      <rect x="2" y="2.5" width="15.5" height="7" rx="1.25" fill="currentColor" />
    </svg>
  )
}

function DeviceStatusBar({ stage }: { stage: DeviceStage }) {
  if (!stage.notch) return null

  const scale = stageScale(stage)
  const height = statusBarHeight(stage)
  const fontSize = Math.max(9, Math.round(11 * scale))
  const iconSize = Math.max(9, Math.round(11 * scale))
  const cornerRadius = Math.max(stage.radius - 10, 10)
  /** Inset coins arrondis — plus à droite (courbure visible). */
  const padLeft = Math.max(22, Math.round(28 * scale))
  const padRight = Math.max(36, Math.round(cornerRadius * 1.12))

  return (
    <div
      className="relative z-20 flex shrink-0 items-center justify-between overflow-hidden bg-[#f7f8fc] text-[#1c1c1e] dark:bg-[#1c1c1e] dark:text-[#f2f2f7]"
      style={{
        height,
        paddingLeft: padLeft,
        paddingRight: padRight,
        fontSize,
        borderTopLeftRadius: cornerRadius,
        borderTopRightRadius: cornerRadius,
      }}
      aria-hidden
    >
      <span className="shrink-0 font-semibold leading-none tabular-nums tracking-tight">9:41</span>
      <div
        className="flex shrink-0 items-center"
        style={{ gap: Math.max(1, Math.round(3 * scale)) }}
      >
        <Icon icon="mdi:signal-cellular-3" style={{ width: iconSize, height: iconSize }} />
        <Icon icon="mdi:wifi" style={{ width: iconSize, height: iconSize }} />
        <IosBatteryIcon size={iconSize} />
      </div>
    </div>
  )
}

function deviceOuterSize(stage: DeviceStage) {
  return {
    width: stage.frameWidth + DEVICE_BEZEL_PX * 2,
    height:
      frameHeight(stage) +
      DEVICE_BEZEL_PX * 2 +
      (stage.monitor ? MONITOR_STAND_PX : 0),
  }
}

function ScaledProductDemoIframe({
  stage,
  ready,
  active,
  demoApp,
}: {
  stage: DeviceStage
  ready: boolean
  active: boolean
  demoApp: ProductCrossPlatformDemoApp
}) {
  const demoSrc =
    demoApp === "drive"
      ? demoDriveLayoutPreviewSrc(stage.id)
      : demoMailPreviewSrc(stage.id)

  const title =
    demoApp === "drive"
      ? `UltiDrive — vue ${stage.label}`
      : `Ultimail — vue ${stage.label}`

  const iframe = (
    <ScaledPreviewIframe
      src={demoSrc}
      title={title}
      viewportWidth={stage.viewportWidth}
      viewportHeight={stage.viewportHeight}
      fit="cover"
      coverEpsilonPx={0}
      ready={ready}
      active={active}
      placeholderClassName="bg-[var(--landing-bg)]"
    />
  )

  // Sans encoche (tablette / bureau) : l'iframe remplit directement la boîte
  // écran en absolute inset-0 — même structure que la démo docs (qui est nette),
  // sans chaîne flex qui introduirait des sous-pixels (bandes au bord).
  if (!stage.notch) {
    return (
      <div
        className="relative h-full w-full overflow-hidden bg-[var(--landing-bg)]"
        aria-hidden={!active}
      >
        {iframe}
      </div>
    )
  }

  // Avec encoche (mobile) : barre de statut en haut, iframe en dessous.
  return (
    <div
      className="relative h-full w-full overflow-hidden bg-black"
      aria-hidden={!active}
    >
      <div className="absolute inset-x-0 top-0 z-20">
        <DeviceStatusBar stage={stage} />
      </div>
      <div
        className="absolute inset-x-0 bottom-0 overflow-hidden bg-[var(--landing-bg)]"
        style={{ top: statusBarHeight(stage) }}
      >
        {iframe}
      </div>
    </div>
  )
}

const MEET_PEOPLE = [
  { name: "Léa", color: "#34A853" },
  { name: "Vincent", color: "#4285F4" },
  { name: "Thomas", color: "#EA4335" },
  { name: "Camille", color: "#FBBC04" },
  { name: "Sofia", color: "#A142F4" },
  { name: "Karim", color: "#00ACC1" },
] as const

const MEET_CONTROLS = ["mdi:microphone", "mdi:video", "mdi:monitor-share", "mdi:message-outline"] as const

/** Visio placeholder statique (pas d'iframe) rendu dans le device frame pour UltiMeet. */
function MeetDevicePlaceholder({
  stage,
  accent,
}: {
  stage: DeviceStage
  accent: string
}) {
  const cols = stage.id === "phone" ? 2 : 3
  const people = stage.id === "phone" ? MEET_PEOPLE.slice(0, 4) : MEET_PEOPLE
  const avatarSize =
    stage.id === "desktop" ? "size-14" : stage.id === "tablet" ? "size-12" : "size-9"
  const buttonSize = stage.id === "phone" ? "size-7" : "size-9"
  const iconSize = stage.id === "phone" ? "size-4" : "size-5"

  return (
    <div className="absolute inset-0 flex flex-col bg-[#0d0f12] text-white">
      <div className="flex items-center gap-1.5 px-3 py-2 text-[11px] font-medium text-white/70">
        <Icon icon="mdi:lock-check" className="size-3.5 shrink-0" style={{ color: accent }} aria-hidden />
        <span className="truncate">Atelier Nord — point hebdo</span>
        <span className="ml-auto shrink-0 tabular-nums">12:47</span>
      </div>

      <div
        className="grid flex-1 gap-1.5 px-2"
        style={{
          gridTemplateColumns: `repeat(${cols}, minmax(0, 1fr))`,
          gridAutoRows: "minmax(0, 1fr)",
        }}
      >
        {people.map((person, index) => (
          <div
            key={person.name}
            className={cn(
              "relative flex items-center justify-center overflow-hidden rounded-lg bg-white/5",
              index === 0 && "ring-2"
            )}
            style={index === 0 ? { boxShadow: `inset 0 0 0 2px ${accent}` } : undefined}
          >
            <div
              className="absolute inset-0"
              style={{
                background: `radial-gradient(circle at 50% 38%, ${person.color}44, transparent 70%)`,
              }}
              aria-hidden
            />
            <span
              className={cn(
                "relative flex items-center justify-center rounded-full font-semibold text-white",
                avatarSize
              )}
              style={{ backgroundColor: person.color }}
              aria-hidden
            >
              {person.name.charAt(0)}
            </span>
            <span className="absolute bottom-1 left-1 flex max-w-[75%] items-center gap-0.5 truncate rounded bg-black/55 px-1 py-0.5 text-[9px] font-medium">
              <Icon
                icon={index % 2 === 0 ? "mdi:microphone" : "mdi:microphone-off"}
                className="size-2.5 shrink-0"
                aria-hidden
              />
              {person.name}
            </span>
          </div>
        ))}
      </div>

      <div className="flex items-center justify-center gap-2 px-3 py-3">
        {MEET_CONTROLS.map((icon) => (
          <span
            key={icon}
            className={cn("flex items-center justify-center rounded-full bg-white/10", buttonSize)}
            aria-hidden
          >
            <Icon icon={icon} className={iconSize} />
          </span>
        ))}
        <span
          className={cn("flex items-center justify-center rounded-full bg-[#EA4335]", buttonSize)}
          aria-hidden
        >
          <Icon icon="mdi:phone-hangup" className={iconSize} />
        </span>
      </div>
    </div>
  )
}

function DeviceShell({
  stage,
  children,
}: {
  stage: DeviceStage
  children: React.ReactNode
}) {
  if (stage.monitor) {
    return (
      <div className="flex flex-col items-center gap-3">
        <div
          className="overflow-hidden border border-[var(--landing-line)] bg-[#101114] p-2 shadow-[0_24px_60px_-24px_rgba(0,0,0,0.45)]"
          style={{ borderRadius: stage.radius + 4 }}
        >
          <div
            className="relative overflow-hidden bg-[var(--landing-bg)]"
            style={{
              width: stage.frameWidth,
              height: frameHeight(stage),
              borderRadius: stage.radius,
            }}
          >
            {children}
          </div>
        </div>
        <div
          className="h-2.5 rounded-full bg-[var(--landing-line)]"
          style={{ width: stage.frameWidth * 0.28 }}
          aria-hidden
        />
      </div>
    )
  }

  return (
    <div
      className="relative border border-[var(--landing-line)] bg-[#101114] p-2 shadow-[0_24px_60px_-24px_rgba(0,0,0,0.45)]"
      style={{ borderRadius: stage.radius }}
    >
      {stage.notch ? (
        <div
          className="pointer-events-none absolute left-1/2 top-[0.75rem] z-30 h-[1.125rem] w-[4.75rem] -translate-x-1/2 rounded-full bg-black"
          aria-hidden
        />
      ) : null}
      <div
        className="relative overflow-hidden bg-[var(--landing-bg)]"
        style={{
          width: stage.frameWidth,
          height: frameHeight(stage),
          borderRadius: Math.max(stage.radius - 10, 10),
        }}
      >
        {children}
      </div>
    </div>
  )
}

function MorphingDeviceShowcase({
  accent,
  demoApp,
}: {
  accent: string
  demoApp: ProductCrossPlatformDemoApp
}) {
  const sectionRef = useRef<HTMLDivElement>(null)
  const [visible, setVisible] = useState(false)
  const [stageIndex, setStageIndex] = useState(0)
  const [autoPlay, setAutoPlay] = useState(true)
  const [reduceMotion, setReduceMotion] = useState(false)

  const stage = DEVICE_STAGES[stageIndex]!

  useEffect(() => {
    setReduceMotion(
      typeof window !== "undefined" &&
        window.matchMedia("(prefers-reduced-motion: reduce)").matches
    )
  }, [])

  useEffect(() => {
    const node = sectionRef.current
    if (!node) return
    const observer = new IntersectionObserver(
      (entries) => {
        if (entries.some((entry) => entry.isIntersecting)) {
          setVisible(true)
          observer.disconnect()
        }
      },
      { rootMargin: "120px 0px" }
    )
    observer.observe(node)
    return () => observer.disconnect()
  }, [])

  useEffect(() => {
    if (!visible || reduceMotion || !autoPlay) return
    const timer = window.setInterval(() => {
      setStageIndex((current) => (current + 1) % DEVICE_STAGES.length)
    }, STAGE_DURATION_MS)
    return () => window.clearInterval(timer)
  }, [visible, reduceMotion, autoPlay])

  return (
    <div ref={sectionRef} className="flex w-full flex-col items-center gap-8">
      <div
        className="relative mx-auto w-full max-w-full"
        style={{ height: SHOWCASE_HEIGHT_PX }}
      >
        {DEVICE_STAGES.map((item, index) => {
          const active = index === stageIndex
          const outer = deviceOuterSize(item)
          return (
            <div
              key={item.id}
              className={cn(
                "absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 transition-all duration-700 ease-[cubic-bezier(0.22,1,0.36,1)]",
                active
                  ? "z-10 opacity-100 scale-100"
                  : "pointer-events-none z-0 scale-[0.97] opacity-0"
              )}
              style={{
                width: outer.width,
                height: outer.height,
              }}
            >
              <DeviceShell stage={item}>
                {demoApp === "meet" ? (
                  <MeetDevicePlaceholder stage={item} accent={accent} />
                ) : (
                  <ScaledProductDemoIframe
                    stage={item}
                    ready={visible}
                    active={active}
                    demoApp={demoApp}
                  />
                )}
              </DeviceShell>
            </div>
          )
        })}
      </div>

      <div className="flex flex-wrap items-center justify-center gap-2">
        {DEVICE_STAGES.map((item, index) => {
          const active = index === stageIndex
          return (
            <button
              key={item.id}
              type="button"
              onClick={() => {
                setAutoPlay(false)
                setStageIndex(index)
              }}
              className={cn(
                "landing-cta h-9 px-4 text-sm",
                active ? "landing-cta--primary" : "landing-cta--ghost"
              )}
              style={
                active
                  ? ({
                      "--landing-glow-a": accent,
                      "--landing-glow-b": accent,
                      "--landing-glow-c": accent,
                    } as React.CSSProperties)
                  : undefined
              }
              aria-pressed={active}
            >
              <Icon icon={item.icon} className="size-4" aria-hidden />
              {item.label}
            </button>
          )
        })}
      </div>

      <p className="text-center text-sm text-[var(--landing-muted)]">
        <span className="font-medium text-[var(--landing-fg)]">{stage.platform}</span>
        {" — "}
        même interface, adaptée à la taille de l&apos;écran
      </p>
    </div>
  )
}

export function ProductCrossPlatformSection({
  section,
  accent,
  demoApp = "mail",
}: {
  section: ProductCrossPlatformSectionData
  accent: string
  demoApp?: ProductCrossPlatformDemoApp
}) {
  return (
    <section id="cross-platform" className="scroll-mt-20 px-4 py-16 sm:px-6 sm:py-20">
      <div className="mx-auto flex w-full max-w-6xl flex-col gap-12">
        <ProductSectionHeading
          eyebrow={section.eyebrow}
          title={section.title}
          description={section.description}
          accent={accent}
        />

        <div className="grid grid-cols-1 items-center gap-10 lg:grid-cols-2 lg:gap-12">
          <LandingReveal delay={0.05}>
            <ul className="flex flex-col gap-3">
              {section.features.map((feature) => (
                <li
                  key={feature.title}
                  className="landing-glass flex gap-3 rounded-xl p-4"
                >
                  <span
                    className="flex size-10 shrink-0 items-center justify-center rounded-lg"
                    style={{
                      backgroundColor: `${accent}14`,
                      color: accent,
                    }}
                  >
                    <Icon icon={feature.icon} className="size-5" aria-hidden />
                  </span>
                  <div className="min-w-0">
                    <h3 className="font-semibold tracking-tight">{feature.title}</h3>
                    <p className="mt-0.5 text-sm text-[var(--landing-muted)]">
                      {feature.description}
                    </p>
                  </div>
                </li>
              ))}
            </ul>
          </LandingReveal>

          <LandingReveal delay={0.12}>
            <MorphingDeviceShowcase accent={accent} demoApp={demoApp} />
          </LandingReveal>
        </div>
      </div>
    </section>
  )
}