// CSV import parsing tests — parseCSV (RFC-ish tokenizer), findColumn
// (header heuristics), and parseEntriesFromCSV (multi-format mapping).
// These are pure functions with no state/DOM coupling.

const test = require('node:test');
const assert = require('node:assert/strict');
const { loadApp } = require('./harness.js');

const T = loadApp().__test;

// Values returned from the vm sandbox carry the sandbox realm's prototypes,
// so deepStrictEqual's prototype check trips. Normalize through JSON to
// compare by structure (fine for plain data).
const eqDeep = (actual, expected, msg) =>
    assert.deepEqual(JSON.parse(JSON.stringify(actual)), expected, msg);

test('parseCSV: simple rows', () => {
    eqDeep(T.parseCSV('a,b,c\n1,2,3'), [['a', 'b', 'c'], ['1', '2', '3']]);
});

test('parseCSV: quoted fields with commas and newlines', () => {
    const rows = T.parseCSV('name,note\n"Smith, John","line1\nline2"');
    eqDeep(rows, [['name', 'note'], ['Smith, John', 'line1\nline2']]);
});

test('parseCSV: escaped double-quotes ("")', () => {
    const rows = T.parseCSV('v\n"say ""hi"""');
    eqDeep(rows, [['v'], ['say "hi"']]);
});

test('parseCSV: CRLF line endings', () => {
    eqDeep(T.parseCSV('a,b\r\n1,2\r\n'), [['a', 'b'], ['1', '2']]);
});

test('parseCSV: trailing field with no final newline', () => {
    eqDeep(T.parseCSV('a,b\n1,2'), [['a', 'b'], ['1', '2']]);
});

test('parseCSV: blank lines are dropped', () => {
    eqDeep(T.parseCSV('a,b\n\n1,2\n'), [['a', 'b'], ['1', '2']]);
});

test('findColumn: case/underscore/dash-insensitive matching', () => {
    const headers = ['Login_URI', 'User Name', 'PASSWORD'];
    assert.equal(T.findColumn(headers, ['login_uri']), 0);
    assert.equal(T.findColumn(headers, ['username', 'user_name']), 1);
    assert.equal(T.findColumn(headers, ['password']), 2);
    assert.equal(T.findColumn(headers, ['nope']), null);
});

test('parseEntriesFromCSV: Bitwarden-style header maps site/user/pwd/totp', () => {
    const csv = [
        'folder,name,login_uri,login_username,login_password,login_totp,notes',
        'Work,GitHub,https://github.com,octocat,s3cret,JBSWY3DPEHPK3PXP,hello',
    ].join('\n');
    const { entries, skipped } = T.parseEntriesFromCSV(csv);
    assert.equal(skipped, 0);
    assert.equal(entries.length, 1);
    const e = entries[0];
    assert.equal(e.title, 'GitHub');
    assert.equal(e.site, 'https://github.com');
    assert.equal(e.username, 'octocat');
    assert.equal(e.password, 's3cret');
    assert.equal(e.totp_secret, 'JBSWY3DPEHPK3PXP');
    assert.equal(e.folder, 'Work');
});

test('parseEntriesFromCSV: KeePass-style header (Title/URL/Username/Password/Group)', () => {
    const csv = [
        'Title,URL,Username,Password,Group,Notes',
        'Bank,https://bank.example,alice,pw123,Finance,note',
    ].join('\n');
    const { entries } = T.parseEntriesFromCSV(csv);
    assert.equal(entries[0].title, 'Bank');
    assert.equal(entries[0].site, 'https://bank.example');
    assert.equal(entries[0].username, 'alice');
    assert.equal(entries[0].folder, 'Finance');
});

test('parseEntriesFromCSV: note heuristic — empty site+pwd but notes present → kind=note', () => {
    const csv = [
        'name,url,username,password,notes',
        'My Note,,,,"just some text"',
    ].join('\n');
    const { entries } = T.parseEntriesFromCSV(csv);
    assert.equal(entries.length, 1);
    assert.equal(entries[0].kind, 'note');
});

test('parseEntriesFromCSV: explicit kind=note wins even with site+password present', () => {
    // A row with site + password normally classifies as a login; an explicit
    // kind=note must override that (precedence: explicit column > heuristic).
    const csv = [
        'name,url,username,password,kind',
        'Recovery Codes,https://example.com,user,BACKUP-CODES,note',
    ].join('\n');
    const { entries } = T.parseEntriesFromCSV(csv);
    assert.equal(entries.length, 1);
    assert.equal(entries[0].kind, 'note');
    assert.equal(entries[0].site, '');          // notes never carry a site
    assert.equal(entries[0].password, 'BACKUP-CODES'); // body preserved
});

test('parseEntriesFromCSV: throws on missing password column', () => {
    assert.throws(() => T.parseEntriesFromCSV('name,url\nfoo,bar'), /password column/i);
});

test('parseEntriesFromCSV: throws when no header + data rows', () => {
    assert.throws(() => T.parseEntriesFromCSV('name,password'), /header row and at least one data row/i);
});

test('parseEntriesFromCSV: throws when no title/url/username column present', () => {
    assert.throws(() => T.parseEntriesFromCSV('password,foo\npw,x'), /title\/url or username/i);
});