(function () {
  var STORAGE_KEY = "zektyc-lang"
  var DEFAULT_LANG = "fr"
  var translations = {}

  function urlLang() {
    var path = window.location.pathname
    if (path === "/en" || path.indexOf("/en/") === 0) return "en"
    if (path === "/fr" || path.indexOf("/fr/") === 0) return "fr"
    return null
  }

  // Langue courante : préfixe d'URL, sinon cookie serveur (choix explicite via
  // /lang), sinon localStorage, sinon détection navigateur. FR par défaut.
  function pickLang() {
    var forced = urlLang()
    if (forced) return forced

    var m = document.cookie.match(/(?:^|;\s*)zektyc-lang=([a-z]+)/)
    if (m && (m[1] === "fr" || m[1] === "en")) return m[1]

    try {
      var stored = localStorage.getItem(STORAGE_KEY)
      if (stored === "fr" || stored === "en") return stored
    } catch (e) {}

    var candidates = []
    if (navigator.languages && navigator.languages.length) {
      candidates = candidates.concat(navigator.languages)
    }
    if (navigator.language) candidates.push(navigator.language)
    if (navigator.userLanguage) candidates.push(navigator.userLanguage)

    for (var i = 0; i < candidates.length; i++) {
      var raw = String(candidates[i] || "").trim().toLowerCase()
      if (!raw) continue
      if (raw.indexOf("en") === 0) return "en"
      if (raw.indexOf("fr") === 0) return "fr"
    }
    return DEFAULT_LANG
  }

  function saveLang(lang) {
    try {
      localStorage.setItem(STORAGE_KEY, lang)
    } catch (e) {}
    document.cookie = "zektyc-lang=" + lang + "; Path=/; Max-Age=31536000"
  }

  function apply(lang) {
    var dict = translations[lang]
    if (!dict) return

    document.documentElement.lang = lang

    if (dict["meta.title"]) document.title = dict["meta.title"]
    var desc = document.querySelector('meta[name="description"]')
    if (desc && dict["meta.description"]) {
      desc.setAttribute("content", dict["meta.description"])
    }
    var ogTitle = document.querySelector('meta[property="og:title"]')
    if (ogTitle && dict["meta.title"]) {
      ogTitle.setAttribute("content", dict["meta.title"])
    }
    var ogDesc = document.querySelector('meta[property="og:description"]')
    if (ogDesc && dict["meta.description"]) {
      ogDesc.setAttribute("content", dict["meta.description"])
    }

    var nodes = document.querySelectorAll("[data-i18n]")
    for (var i = 0; i < nodes.length; i++) {
      var key = nodes[i].getAttribute("data-i18n")
      if (dict[key] !== undefined) nodes[i].textContent = dict[key]
    }

    var btns = document.querySelectorAll("[data-lang]")
    for (var j = 0; j < btns.length; j++) {
      btns[j].classList.toggle(
        "active",
        btns[j].getAttribute("data-lang") === lang
      )
    }

    var langLinks = document.querySelectorAll("[data-lang-path]")
    for (var k = 0; k < langLinks.length; k++) {
      langLinks[k].setAttribute(
        "href",
        "/" + lang + langLinks[k].getAttribute("data-lang-path")
      )
    }
  }

  var lang = pickLang()
  fetch("/data/i18n/" + lang + ".json", { cache: "no-cache" })
    .then(function (res) {
      if (!res.ok) throw new Error("status " + res.status)
      return res.json()
    })
    .then(function (data) {
      if (data && typeof data === "object") translations[lang] = data
    })
    .catch(function (e) {
      if (window.console && console.warn) {
        console.warn("[i18n] impossible de charger les traductions:", e)
      }
    })
    .then(function () {
      var detected = pickLang()
      if (window.console && console.info) {
        console.info(
          "[i18n] langue détectée:",
          detected,
          "| navigator.language:",
          navigator.language,
          "| navigator.languages:",
          navigator.languages
        )
      }
      apply(detected)

      document.addEventListener("click", function (e) {
        var btn = e.target.closest ? e.target.closest("[data-lang]") : null
        if (!btn) return
        var langBtn = btn.getAttribute("data-lang")
        if (langBtn !== "fr" && langBtn !== "en") return
        saveLang(langBtn)

        var currentPath = window.location.pathname
        var target = currentPath
        if (/^\/fr(\/|$)/.test(currentPath) || /^\/en(\/|$)/.test(currentPath)) {
          target = "".concat("/", langBtn, currentPath.slice(3))
        }
        if (window.location.pathname !== target) {
          window.location.href = target
        }
      })

      var navToggle = document.getElementById("nav-toggle")
      if (navToggle) {
        document.addEventListener("click", function (e) {
          if (e.target.closest && e.target.closest(".site-nav")) {
            navToggle.checked = false
          }
        })
      }
    })
})()