export function buildURL(query, limit = 20, offset = 0, filters = {}) {
  let url =
    "https://data.enseignementsup-recherche.gouv.fr/api/explore/v2.1/catalog/datasets/fr-esr-parcoursup/records?"

  url += "limit=" + limit
  url += "&offset=" + offset

  var conditions = []

  if (query && query.trim() !== "") {
    conditions.push("search(lib_for_voe_ins, '" + query + "')")
  }

  if (filters.filiere && filters.filiere !== "") {
    conditions.push("fili='" + filters.filiere + "'")
  }

  if (filters.selectivite && filters.selectivite !== "") {
    conditions.push("select_form='" + filters.selectivite + "'")
  }

  if (filters.region && filters.region !== "") {
    conditions.push("region_etab_aff='" + filters.region + "'")
  }

  if (filters.tauxMin && filters.tauxMin > 0) {
    conditions.push("taux_acces_ens>=" + filters.tauxMin)
  }

  if (filters.tauxMax && filters.tauxMax < 100) {
    conditions.push("taux_acces_ens<=" + filters.tauxMax)
  }

  if (conditions.length > 0) {
    url += "&where=" + conditions.join(" AND ")
  }

  return url
}

export async function fetchFormations(query, limit = 20, offset = 0, filters = {}) {
  const url = buildURL(query, limit, offset, filters)
  const response = await fetch(url)

  if (!response.ok) {
    throw new Error("Erreur HTTP")
  }

  return await response.json()
}

export async function fetchFormationHistory(codUai, nomFormation) {
  var datasets = {
    2020: "fr-esr-parcoursup_2020",
    2021: "fr-esr-parcoursup_2021",
    2022: "fr-esr-parcoursup_2022",
    2023: "fr-esr-parcoursup_2023",
    2024: "fr-esr-parcoursup_2024",
    2025: "fr-esr-parcoursup"
  }

  var history = []
  var searchName = nomFormation.substring(0, 40).replace(/'/g, "\\'")
  var years = [2020, 2021, 2022, 2023, 2024, 2025]

  for (var i = 0; i < years.length; i++) {
    var year = years[i]
    var dataset = datasets[year]

    try {
      var url = "https://data.enseignementsup-recherche.gouv.fr/api/explore/v2.1/catalog/datasets/"
        + dataset + "/records?"
        + "limit=5"
        + "&where=cod_uai%3D'" + codUai + "' AND search(lib_for_voe_ins, '" + searchName + "')"
        + "&select=cod_uai,lib_for_voe_ins,voe_tot,acc_tot,pct_sansmention,pct_ab,pct_b,pct_tb,pct_tbf,pct_bg,pct_bt,pct_bp"

      var response = await fetch(url)

      if (response.ok) {
        var data = await response.json()

        if (data.results && data.results.length > 0) {
          var r = data.results[0]
          var taux = 0

          if (r.voe_tot && r.voe_tot > 0) {
            taux = Math.round((r.acc_tot / r.voe_tot) * 100)
          }

          history.push({
            annee: year,
            tauxAcces: taux,
            candidats: r.voe_tot || 0,
            admis: r.acc_tot || 0,
            pctSansMention: r.pct_sansmention || 0,
            pctAB: r.pct_ab || 0,
            pctB: r.pct_b || 0,
            pctTB: r.pct_tb || 0,
            pctTBF: r.pct_tbf || 0,
            pctGeneral: r.pct_bg || 0,
            pctTechno: r.pct_bt || 0,
            pctPro: r.pct_bp || 0
          })
        }
      }
    } catch (e) {
      console.warn("Erreur pour " + year + ":", e)
    }
  }

  return history
}