const test = require('node:test');
const assert = require('node:assert/strict');
const {
    MODE_WEIGHTS,
    hardBlock,
    scoreCandidate
} = require('../server/services/liveGroupingScoring');
const {
    collectIdentityHints,
    collectOptionalIdentityHints,
    normalizeChannelName,
    projectCatalog
} = require('../server/services/liveProjectionService');

const channel = (id, name, extra = {}) => ({
    id,
    source_id: 1,
    item_id: id,
    name,
    category_id: 'sports',
    fingerprint: normalizeChannelName(name),
    ...extra
});

test('weights match the validated architecture and remain bounded', () => {
    assert.deepEqual(MODE_WEIGHTS.algo, { algorithm: 80, structure: 15, metadata: 5, laya: 0 });
    assert.deepEqual(MODE_WEIGHTS.hybrid, { algorithm: 70, structure: 15, metadata: 5, laya: 10 });
    assert.deepEqual(MODE_WEIGHTS.laya, { algorithm: 55, structure: 15, metadata: 5, laya: 25 });
});

test('exact algorithm match merges without Laya', () => {
    const left = channel('a', 'beIN Sports 1 HD');
    const right = channel('b', 'beIN Sports 1 4K');
    assert.equal(scoreCandidate(left, right, { mode: 'algo' }).matched, true);
});

test('exact algorithm match survives a contradictory Laya opinion', () => {
    const left = channel('a', 'beIN Sports 1 HD');
    const right = channel('b', 'beIN Sports 1 4K');
    const score = scoreCandidate(left, right, {
        mode: 'hybrid',
        layaHint: { sameIdentityProbability: 0, confidence: 1, number: '2' }
    });
    assert.equal(score.matched, true);
    assert.equal(score.signals.laya, 0);
});

test('exact generic fingerprints merge in Laya-only mode without family metadata', () => {
    const left = channel('a', '1000 x Hora TV', { category_id: 'one' });
    const right = channel('b', '|UY| 1000 x Hora TV', { category_id: 'two' });
    const score = scoreCandidate(left, right, { mode: 'laya' });
    assert.equal(score.total, 55);
    assert.equal(score.matched, true);
    const groups = projectCatalog([left, right], { mode: 'laya' });
    assert.equal(groups.length, 1);
});

test('different channel numbers block even when Laya proposes a merge', () => {
    const left = channel('a', 'beIN Sports 1');
    const right = channel('b', 'beIN Sports 2');
    const score = scoreCandidate(left, right, {
        mode: 'laya', layaHint: { sameIdentityProbability: 1, confidence: 1 }
    });
    assert.equal(score.matched, false);
    assert.equal(score.blocker, 'number_mismatch');
});

test('protected max token blocks beIN Sports Max 10 from beIN Sports 1', () => {
    assert.equal(hardBlock(channel('a', 'beIN Sports Max 10'), channel('b', 'beIN Sports 1')), 'protected_token_mismatch');
    assert.equal(projectCatalog([
        channel('a', 'beIN Sports Max 10'), channel('b', 'beIN Sports 1')
    ], { mode: 'laya' }).length, 2);
});

test('different strong families are blocked before weighted scoring', () => {
    assert.equal(hardBlock(channel('a', 'beIN Sports 1'), channel('b', 'Sky Sports 1')), 'strong_family_mismatch');
});

test('low-confidence Laya hint contributes zero', () => {
    const score = scoreCandidate(
        channel('a', 'beIN Sports 1 Event'),
        channel('b', 'beIN Sports 1'),
        { mode: 'hybrid', layaHint: { sameIdentityProbability: 1, confidence: 0.64 } }
    );
    assert.equal(score.signals.laya, 0);
    assert.equal(score.matched, false);
});

test('No Laya mode never calls the identity client', async () => {
    let calls = 0;
    const hints = await collectIdentityHints([
        channel('a', 'beIN Sports 1 Event'), channel('b', 'beIN Sports 1')
    ], 'algo', { identityHintBatch: async () => { calls++; return []; } });
    assert.equal(calls, 0);
    assert.equal(hints.size, 0);
});

test('Laya only calls Laya but still respects blockers', async () => {
    let calls = 0;
    const items = [channel('a', 'beIN Sports 1 Event'), channel('b', 'beIN Sports 1')];
    const hints = await collectIdentityHints(items, 'laya', {
        identityHintBatch: async pairs => {
            calls++;
            return pairs.map(pair => ({ id: pair.id, sameIdentityProbability: 1, confidence: 1 }));
        }
    });
    assert.equal(calls, 1);
    assert.equal(projectCatalog(items, { mode: 'laya', identityHints: hints }).length, 1);
    assert.equal(projectCatalog([
        channel('1', 'beIN Sports 1'), channel('2', 'beIN Sports 2')
    ], { mode: 'laya', identityHints: hints }).length, 2);
});

test('hybrid mode caps the positive Laya contribution at weight 10', () => {
    const score = scoreCandidate(
        channel('a', 'beIN Sports 1 Event'),
        channel('b', 'beIN Sports 1'),
        { mode: 'hybrid', layaHint: { sameIdentityProbability: 1, confidence: 5 } }
    );
    assert.equal(score.signals.laya, 1);
    assert.equal(score.total, 72);
    assert.equal(score.matched, true);
});

test('Laya bridge followed by an exact alias stays in one unique fingerprint group', () => {
    const items = [
        channel('a', 'beIN Sports 1 Event'),
        channel('b', 'beIN Sports 1'),
        channel('c', 'beIN Sports 1')
    ];
    const hints = new Map([[
        ['a', 'b'].sort().join('\0'),
        { sameIdentityProbability: 1, confidence: 1 }
    ]]);
    const groups = projectCatalog(items, { mode: 'hybrid', identityHints: hints });
    assert.equal(groups.length, 1);
    assert.equal(groups[0].fingerprint, 'bein sports 1');
    assert.equal(groups[0].variants.length, 3);
});

test('optional Laya failure degrades to an empty signal set', async () => {
    const hints = await collectOptionalIdentityHints([
        channel('a', 'beIN Sports 1 Event'), channel('b', 'beIN Sports 1')
    ], 'hybrid', {
        identityHintBatch: async () => { throw new Error('runtime unavailable at https://private.invalid'); }
    });
    assert.equal(hints.size, 0);
});