import { describe, it } from 'node:test';
import assert from 'node:assert/strict';

import {
    diffStorePhones,
    formatExportFilename,
    formatExportMessage,
    parseStorePhoneCsv,
    rowsToCsv,
} from '../src/services/storePhoneExport.js';

describe('rowsToCsv / parseStorePhoneCsv', () => {
    it('round-trips rows with no header', () => {
        const rows = [
            { phoneNumber: '+14044708802', name: 'Store 7311' },
            { phoneNumber: '+17245537090', name: 'Store 0006 - TestLab' },
        ];
        const csv = rowsToCsv(rows);
        assert.equal(csv, '+14044708802,Store 7311\n+17245537090,Store 0006 - TestLab\n');
        const map = parseStorePhoneCsv(csv);
        assert.equal(map.size, 2);
        assert.equal(map.get('Store 7311'), '+14044708802');
        assert.equal(map.get('Store 0006 - TestLab'), '+17245537090');
    });

    it('returns empty string for no rows', () => {
        assert.equal(rowsToCsv([]), '');
        assert.equal(parseStorePhoneCsv('').size, 0);
    });

    it('ignores blank and malformed lines when parsing', () => {
        const text = '+15551234567,Store 0499\n\nbadline\n,+1\n';
        const map = parseStorePhoneCsv(text);
        assert.equal(map.size, 1);
        assert.equal(map.get('Store 0499'), '+15551234567');
    });
});

describe('formatExportFilename', () => {
    it('matches StorePhone-YYYY-MM-DDT…csv with underscores in time and offset', () => {
        // Jul 15 2026 09:10:03.455 EDT = UTC-4
        const date = new Date('2026-07-15T13:10:03.455Z');
        const name = formatExportFilename(date, 'America/New_York');
        assert.match(
            name,
            /^StorePhone-\d{4}-\d{2}-\d{2}T\d{2}_\d{2}_\d{2}\.\d{3}[+-]\d{2}_\d{2}\.csv$/,
        );
        assert.ok(name.includes('2026-07-15'), name);
        assert.ok(name.includes('09_10_03'), name);
    });
});

describe('diffStorePhones', () => {
    const prev = new Map([
        ['Store 0499', '+15551111111'],
        ['Store 0500', '+15552222222'],
        ['Store 0999', '+15559999999'],
    ]);

    it('detects added, removed, and changed rows', () => {
        const curr = new Map([
            ['Store 0499', '+15559876543'],
            ['Store 0500', '+15552222222'],
            ['Store 7311', '+14044708802'],
        ]);
        const diff = diffStorePhones(prev, curr);
        assert.equal(diff.added.length, 1);
        assert.equal(diff.added[0].name, 'Store 7311');
        assert.equal(diff.removed.length, 1);
        assert.equal(diff.removed[0].name, 'Store 0999');
        assert.equal(diff.changed.length, 1);
        assert.equal(diff.changed[0].name, 'Store 0499');
        assert.equal(diff.unchangedCount, 1);
    });

    it('reports no changes when maps are identical', () => {
        const diff = diffStorePhones(prev, new Map(prev));
        assert.equal(diff.added.length, 0);
        assert.equal(diff.removed.length, 0);
        assert.equal(diff.changed.length, 0);
        assert.equal(diff.unchangedCount, 3);
    });
});

describe('formatExportMessage', () => {
    const date = new Date('2026-07-15T14:00:00.000Z');

    it('notes first run when there is no baseline', () => {
        const msg = formatExportMessage({
            date,
            timeZone: 'America/New_York',
            rowCount: 1081,
            diff: { added: [], removed: [], changed: [], unchangedCount: 0 },
            isFirstRun: true,
        });
        assert.match(msg, /First export/);
        assert.match(msg, /1,081/);
    });

    it('lists changes when present', () => {
        const msg = formatExportMessage({
            date,
            timeZone: 'America/New_York',
            rowCount: 3,
            isFirstRun: false,
            diff: {
                added: [{ name: 'Store 7311', phoneNumber: '+14044708802' }],
                removed: [],
                changed: [
                    {
                        name: 'Store 0499',
                        oldPhone: '+15551111111',
                        newPhone: '+15559876543',
                    },
                ],
                unchangedCount: 1,
            },
        });
        assert.match(msg, /Added \(1\)/);
        assert.match(msg, /Store 7311/);
        assert.match(msg, /Changed \(1\)/);
        assert.match(msg, /0499/);
    });

    it('says no changes when diff is empty', () => {
        const msg = formatExportMessage({
            date,
            timeZone: 'America/New_York',
            rowCount: 10,
            isFirstRun: false,
            diff: { added: [], removed: [], changed: [], unchangedCount: 10 },
        });
        assert.match(msg, /No changes since last run/);
    });
});