local createLibTest = require('/apis/libtest');
local createInstallerDisk = require('/apis/libinstallerdisk');

local testlib = createLibTest({ ... });

local counter = 0;

local function freshDir()
  counter = counter + 1;
  local path = '/create-disk-test/case-' .. counter;
  fs.delete(path);
  fs.makeDir(path);
  return path;
end

local function readAll(path)
  local file = fs.open(path, 'r');
  local body = file.readAll();
  file.close();
  return body;
end

local function writeFile(path, body)
  local file = fs.open(path, 'w');
  file.write(body);
  file.close();
end

local function fakePeripheral(drives)
  local names = {};
  local byName = {};
  for i, drive in ipairs(drives) do
    drive.name = drive.name or ('drive_' .. i);
    drive.present = drive.present ~= false;
    drive.data = drive.data ~= false;
    names[#names + 1] = drive.name;
    byName[drive.name] = drive;
  end

  return {
    getNames = function()
      return names;
    end,
    getType = function(name)
      if byName[name] then return 'drive'; end
      return nil;
    end,
    wrap = function(name)
      local drive = byName[name];
      return {
        isDiskPresent = function()
          return drive.present;
        end,
        hasData = function()
          return drive.data;
        end,
        getMountPath = function()
          return drive.mountPath;
        end,
        setDiskLabel = function(label)
          drive.label = label;
        end,
        getDiskLabel = function()
          return drive.label;
        end,
      };
    end,
  };
end

local function fakeSettings()
  local api = { saveCount = 0 };
  function api.save()
    api.saveCount = api.saveCount + 1;
  end
  return api;
end

local function assertCompiles(body)
  local chunk, err = load(body, 'generated-startup');
  testlib.assertTrue(chunk, tostring(err));
end

testlib.test('install autorun copies settings before wget and no reboot', function()
  local installer = createInstallerDisk();
  local body = installer.buildAutorun('install');
  assertCompiles(body);
  local sentinel = string.find(body, "fs.exists('/trapos')", 1, true);
  local label = string.find(body, 'TrapOS Disk', 1, true);
  local url = string.find(body, 'https://os.trapcloud.fr/install', 1, true);
  local copy = string.find(body, "fs.copy(src, '/.settings')", 1, true);
  local wget = string.find(body, "shell.run('wget', 'run', INSTALL_URL)", 1, true);

  testlib.assertTrue(sentinel);
  testlib.assertTrue(label);
  testlib.assertTrue(url);
  testlib.assertTrue(copy);
  testlib.assertTrue(wget);
  testlib.assertTrue(copy < wget);
  testlib.assertTrue(not string.find(body, 'os.reboot', 1, true));
end);

testlib.test('uninstall autorun removes trapos and waits for eject', function()
  local installer = createInstallerDisk();
  local body = installer.buildAutorun('uninstall');
  assertCompiles(body);

  testlib.assertTrue(string.find(body, "shell.run('ccpm', 'uninstall', 'trapos', '--yes')", 1, true));
  testlib.assertTrue(string.find(body, "os.pullEvent('disk_eject')", 1, true));
  testlib.assertTrue(string.find(body, 'os.reboot', 1, true));
  testlib.assertTrue(not string.find(body, "shell.run('wget'", 1, true));
  testlib.assertTrue(not string.find(body, "fs.copy(src, '/.settings')", 1, true));
end);

testlib.test('reinstall autorun uses marker, uninstall and wget', function()
  local installer = createInstallerDisk();
  local body = installer.buildAutorun('reinstall');
  assertCompiles(body);

  testlib.assertTrue(string.find(body, '.trapos-reinstalled', 1, true));
  testlib.assertTrue(string.find(body, 'writeMarker(MARKER)', 1, true));
  testlib.assertTrue(string.find(body, "shell.run('ccpm', 'uninstall', 'trapos', '--yes')", 1, true));
  testlib.assertTrue(string.find(body, "shell.run('wget', 'run', INSTALL_URL)", 1, true));
  testlib.assertTrue(string.find(body, "os.pullEvent('disk_eject')", 1, true));
end);

testlib.test('findTargetDrive asks for blank disk with zero drives', function()
  local installer = createInstallerDisk({ peripheral = fakePeripheral({}) });
  local ok, err = installer.findTargetDrive();
  testlib.assertTrue(not ok);
  testlib.assertTrue(string.find(err, 'insert a blank', 1, true));
end);

testlib.test('findTargetDrive rejects a non-empty floppy', function()
  local disk = freshDir();
  writeFile(fs.combine(disk, 'existing'), 'x');
  local installer = createInstallerDisk({
    peripheral = fakePeripheral({ { mountPath = disk } }),
  });
  local ok, err = installer.findTargetDrive();
  testlib.assertTrue(not ok);
  testlib.assertTrue(string.find(err, 'not empty', 1, true));
end);

testlib.test('findTargetDrive picks one empty over one non-empty', function()
  local nonEmpty = freshDir();
  local empty = freshDir();
  writeFile(fs.combine(nonEmpty, 'existing'), 'x');
  local installer = createInstallerDisk({
    peripheral = fakePeripheral({
      { name = 'left', mountPath = nonEmpty },
      { name = 'right', mountPath = empty },
    }),
  });
  local ok, result = installer.findTargetDrive();
  testlib.assertTrue(ok, tostring(result));
  testlib.assertEquals(result.name, 'right');
  testlib.assertEquals(result.mountPath, empty);
end);

testlib.test('findTargetDrive rejects multiple empty disks', function()
  local installer = createInstallerDisk({
    peripheral = fakePeripheral({
      { mountPath = freshDir() },
      { mountPath = freshDir() },
    }),
  });
  local ok, err = installer.findTargetDrive();
  testlib.assertTrue(not ok);
  testlib.assertTrue(string.find(err, 'remove all but one', 1, true));
end);

testlib.test('create install disk labels, copies settings, writes startup', function()
  local disk = freshDir();
  local settingsPath = fs.combine(freshDir(), '.settings');
  local drive = { name = 'top', mountPath = disk };
  local settingsApi = fakeSettings();
  writeFile(settingsPath, 'cloud.url=https://example.test');

  local installer = createInstallerDisk({
    peripheral = fakePeripheral({ drive }),
    settings = settingsApi,
    settingsSourcePath = settingsPath,
  });
  local ok, result = installer.create({ mode = 'install' });

  testlib.assertTrue(ok, tostring(result));
  testlib.assertEquals(drive.label, 'TrapOS Disk');
  testlib.assertEquals(result.mode, 'install');
  testlib.assertEquals(settingsApi.saveCount, 1);
  testlib.assertEquals(readAll(fs.combine(disk, 'startup.lua')), installer.buildAutorun('install'));
  testlib.assertEquals(readAll(fs.combine(disk, '.settings')), 'cloud.url=https://example.test');
  testlib.assertTrue(result.settingsCopied);
  testlib.assertTrue(not result.settingsWarning);
end);

testlib.test('create install disk warns when settings source is missing', function()
  local disk = freshDir();
  local settingsApi = fakeSettings();
  local installer = createInstallerDisk({
    peripheral = fakePeripheral({ { mountPath = disk } }),
    settings = settingsApi,
    settingsSourcePath = fs.combine(freshDir(), '.settings'),
  });
  local ok, result = installer.create({ mode = 'install' });

  testlib.assertTrue(ok, tostring(result));
  testlib.assertEquals(settingsApi.saveCount, 0);
  testlib.assertTrue(not fs.exists(fs.combine(disk, '.settings')));
  testlib.assertTrue(not result.settingsCopied);
  testlib.assertTrue(result.settingsWarning);
  testlib.assertEquals(readAll(fs.combine(disk, 'startup.lua')), installer.buildAutorun('install'));
end);

testlib.test('create reinstall disk skips settings clone', function()
  local disk = freshDir();
  local settingsPath = fs.combine(freshDir(), '.settings');
  local drive = { name = 'top', mountPath = disk };
  local settingsApi = fakeSettings();
  writeFile(settingsPath, 'cloud.url=https://example.test');

  local installer = createInstallerDisk({
    peripheral = fakePeripheral({ drive }),
    settings = settingsApi,
    settingsSourcePath = settingsPath,
  });
  local ok, result = installer.create({ mode = 'reinstall' });

  testlib.assertTrue(ok, tostring(result));
  testlib.assertEquals(drive.label, 'TrapOS Disk');
  testlib.assertEquals(result.mode, 'reinstall');
  testlib.assertEquals(settingsApi.saveCount, 0);
  testlib.assertTrue(not fs.exists(fs.combine(disk, '.settings')));
  testlib.assertTrue(not result.settingsCopied);
  testlib.assertTrue(not result.settingsWarning);
  testlib.assertEquals(readAll(fs.combine(disk, 'startup.lua')), installer.buildAutorun('reinstall'));
end);

testlib.run();