var repodata = {"platforms": {"EL-8": [{"arch": "ppc64le", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "aarch64", "versions": ["18", "17", "16", "15", "14"]}], "EL-9": [{"arch": "ppc64le", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "aarch64", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}], "EL-7": [{"arch": "ppc64le", "versions": ["15", "14", "13", "12"]}, {"arch": "x86_64", "versions": ["15", "14", "13", "12"]}, {"arch": "aarch64", "versions": ["15", "14", "13", "12"]}], "F-43": [{"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}], "F-44": [{"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}], "EL-10": [{"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "ppc64le", "versions": ["18", "17", "16", "15", "14"]}, {"arch": "aarch64", "versions": ["18", "17", "16", "15", "14"]}], "EL-6": [{"arch": "x86_64", "versions": ["12", "11", "10", "96", "95", "94"]}, {"arch": "i386", "versions": ["12", "11", "10", "96", "95", "94"]}], "F-41": [{"arch": "x86_64", "versions": ["18", "17", "16", "15", "14", "13"]}], "F-42": [{"arch": "x86_64", "versions": ["18", "17", "16", "15", "14"]}]}};
var supported_versions = [18,17,16,15,14];

function sortNumeric(a,b) {
   return a-b;
}

function get_platform_name(plat, ver) {
    if (plat == 'EL') {
        if (parseFloat(ver) <= 7)
	    return "Red Hat Enterprise, CentOS, Scientific or Oracle";
        else
	    return "Red Hat Enterprise Linux, Rocky Linux, AlmaLinux or Oracle Linux";
    }
    else if (plat == 'F')
	return "Fedora";
    return "未知发行版";
}

function get_rpm_prefix(plat) {
   if (plat.startsWith('EL-'))
       return 'redhat';
    else if (plat.startsWith('F-'))
	return 'fedora';
    return 'unknown';
}

function get_installer(plat) {
    if (plat.startsWith('F-'))
	return 'dnf';
    else if (plat.startsWith('EL-')) {
	var a = plat.split('-');
	if (a[1] >= 8)
	    return 'dnf';
    }
    return 'yum';
}

function disable_module_on(plat) {
    if (plat.startsWith('EL-')) {
	var a = plat.split('-');
	if (a[1] == 8)
	    return true;
    }
    return false;
}

function uses_systemd(plat) {
    if (plat.startsWith('EL-')) {
	var a = plat.split('-');
	if (a[1] < 7)
	    return false;
    }
    return true;
}

function get_platform_text(p) {
    const a = p.split('-');
    return get_platform_name(a[0], a[1]) + ' 版本 ' + a[1];
}

function get_supported_platforms() {
  return Object.keys(repodata['platforms']).sort().filter((plat) => {
    return repodata['platforms'][plat].some((entry) => {
      return entry['versions'].some((version) => supported_versions.includes(parseInt(version)));
    });
  });
}

function get_supported_arches(plat) {
  return repodata['platforms'][plat]
    .filter((entry) => entry['versions'].some((version) => supported_versions.includes(parseInt(version))))
    .sort((a, b) => a['arch'].localeCompare(b['arch']));
}

function get_supported_versions_for_arch(plat, arch) {
  for (const a in repodata['platforms'][plat]) {
    if (repodata['platforms'][plat][a]['arch'] === arch) {
      return repodata['platforms'][plat][a]['versions'].filter((version) => supported_versions.includes(parseInt(version)));
    }
  }
  return [];
}

window.onload = function() {
  const platbox = document.getElementById('platform');
  const platkeys = get_supported_platforms();

  let opt = document.createElement('option');
  opt.text = '* 选择操作系统平台';
  opt.value = "-1";
  platbox.add(opt);

  for (const pp in platkeys) {
    opt = document.createElement('option');
    opt.text = get_platform_text(platkeys[pp]);
    opt.value = platkeys[pp];
    platbox.add(opt);
  }

  platChanged()
}

function platChanged() {
  const plat = document.getElementById('platform').value;
  const archbox = document.getElementById('arch');

  while (archbox.options.length > 0) {
    archbox.options.remove(0);
  }

  if (!plat || plat === "-1") {
    archChanged();
    return;
  }

 let opt = document.createElement('option');
 opt.text = '* 选择系统架构';
 opt.value = "-1";
 archbox.add(opt);

  const arches = get_supported_arches(plat);
  for (const a in arches) {
     opt = document.createElement('option');
     opt.text = opt.value = arches[a]['arch'];
     archbox.add(opt);
  }

  archChanged();
}

function archChanged() {
  const plat = document.getElementById('platform').value;
  const arch = document.getElementById('arch').value;
  const verbox = document.getElementById('version');

  while (verbox.options.length > 0) {
    verbox.options.remove(0);
  }

  if (!arch || arch === "-1") {
    verChanged();
    return;
  }

 let opt = document.createElement('option');
 opt.text = '* 选择需要的 PostgreSQL 大版本';
 opt.value = "-1";
 verbox.add(opt);

 let versions = get_supported_versions_for_arch(plat, arch);

  for (const a in versions.sort()) {
    opt = document.createElement('option');
    opt.text = opt.value = versions[a];
    verbox.add(opt);
  }

  verChanged();
}

function verChanged() {
  var ver = document.getElementById('version').value;
  var plat = document.getElementById('platform').value;
  var arch = document.getElementById('arch').value;
  var scriptBox = document.getElementById('script-box')

  if (!ver || ver === "-1") {
     document.getElementById('copy-btn').style.display = 'none';
     document.getElementById('copy-btn-root').style.display = 'none';
     scriptBox.innerHTML = '请先在上方选择平台、架构和版本';
     return;
  }

  var shortver = ver.replace('.', '');

  var url = 'https://download.postgresql.org/pub/repos/yum/reporpms/' + plat + '-' + arch + '/pgdg-' + get_rpm_prefix(plat) +'-repo-latest.noarch.rpm';

  var installer = get_installer(plat);
  scriptBox.innerHTML = '# 安装仓库本身的 RPM:\n';
  scriptBox.innerHTML += 'sudo ' + installer + ' install -y ' + url + '\n\n';

  if (disable_module_on(plat)) {
    scriptBox.innerHTML += '# 禁用内置的 PostgreSQL 模块：\n';
    scriptBox.innerHTML += 'sudo dnf -qy module disable postgresql\n\n';
  }

  scriptBox.innerHTML += '# 安装 PostgreSQL：\n';
  scriptBox.innerHTML += 'sudo ' + installer + ' install -y postgresql' + shortver + '-server\n\n';

  scriptBox.innerHTML += '# 【可选】初始化数据库并打开自动启动：\n';
  if (uses_systemd(plat)) {
    var setupcmd = 'postgresql-' + shortver + '-setup';
    if (ver < 10) {
      setupcmd = 'postgresql' + shortver + '-setup';
    }
    scriptBox.innerHTML += 'sudo /usr/pgsql-' + ver + '/bin/' + setupcmd + ' initdb\nsudo systemctl enable postgresql-' + ver + '\nsudo systemctl start postgresql-' + ver;
  }
  else {
    scriptBox.innerHTML += 'sudo service postgresql-' + ver + ' initdb\nsudo chkconfig postgresql-' + ver + ' on\nsudo service postgresql-' + ver + ' start';
  }

  document.getElementById('copy-btn').style.display = 'block';
  document.getElementById('copy-btn-root').style.display = 'block';
}

/* Event handlers */
function setupHandlers() {
    document.getElementById('copy-btn').addEventListener('click', function () {
        copyScript(this, 'script-box');
    });
    document.getElementById('copy-btn-root').addEventListener('click', function () {
        copyScript(this, 'script-box', true);
    });
    document.getElementById('version').addEventListener('change', verChanged);
    document.getElementById('platform').addEventListener('change', platChanged);
    document.getElementById('arch').addEventListener('change', archChanged);
}

document.addEventListener("DOMContentLoaded", setupHandlers);