<?php

declare(strict_types=1);

use App\Services\EarlyGrowth\AdaptiveTimeWindow;
use App\Services\EarlyGrowth\EarlyGrowth;
use App\Services\EarlyGrowth\FeedBlender;
use App\Services\EarlyGrowth\GridFiller;
use App\Services\EarlyGrowth\SpotlightEngineInterface;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\Cache;
use Tests\TestCase;

uses(TestCase::class);

// ─── EarlyGrowth feature-flag guard ──────────────────────────────────────────

it('EarlyGrowth::enabled returns false when config disabled', function () {
    config()->set('early_growth.enabled', false);
    config()->set('early_growth.mode', 'light');

    expect(EarlyGrowth::enabled())->toBeFalse();
});

it('EarlyGrowth::enabled returns false when mode is off', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'off');

    expect(EarlyGrowth::enabled())->toBeFalse();
});

it('EarlyGrowth::enabled returns true when enabled and mode is light', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);

    expect(EarlyGrowth::enabled())->toBeTrue();
});

it('EarlyGrowth::enabled returns true when mode is aggressive', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'aggressive');
    config()->set('early_growth.auto_disable.enabled', false);

    expect(EarlyGrowth::enabled())->toBeTrue();
});

it('EarlyGrowth::mode rejects unknown values and returns off', function () {
    config()->set('early_growth.mode', 'extreme_turbo');

    expect(EarlyGrowth::mode())->toBe('off');
});

it('EarlyGrowth::status returns all keys', function () {
    config()->set('early_growth.enabled', false);
    config()->set('early_growth.mode', 'off');

    $status = EarlyGrowth::status();

    expect($status)->toHaveKeys(['enabled', 'mode', 'adaptive_window', 'grid_filler', 'spotlight', 'activity_layer']);
});

it('module toggles are false when EGS is disabled', function () {
    config()->set('early_growth.enabled', false);

    expect(EarlyGrowth::adaptiveWindowEnabled())->toBeFalse();
    expect(EarlyGrowth::gridFillerEnabled())->toBeFalse();
    expect(EarlyGrowth::spotlightEnabled())->toBeFalse();
    expect(EarlyGrowth::activityLayerEnabled())->toBeFalse();
});

it('module toggles respect individual flags when EGS is on', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.adaptive_time_window', false);
    config()->set('early_growth.grid_filler', true);
    config()->set('early_growth.spotlight', false);
    config()->set('early_growth.activity_layer', true);

    expect(EarlyGrowth::adaptiveWindowEnabled())->toBeFalse();
    expect(EarlyGrowth::gridFillerEnabled())->toBeTrue();
    expect(EarlyGrowth::spotlightEnabled())->toBeFalse();
    expect(EarlyGrowth::activityLayerEnabled())->toBeTrue();
});

it('EarlyGrowth returns correct blend ratios per mode', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.blend_ratios.light', ['fresh' => 0.60, 'curated' => 0.25, 'spotlight' => 0.15]);

    $ratios = EarlyGrowth::blendRatios();

    expect($ratios['fresh'])->toBe(0.60);
    expect($ratios['curated'])->toBe(0.25);
    expect($ratios['spotlight'])->toBe(0.15);
});

// ─── AdaptiveTimeWindow ───────────────────────────────────────────────────────

it('AdaptiveTimeWindow returns default when EGS disabled', function () {
    config()->set('early_growth.enabled', false);

    $tw = new AdaptiveTimeWindow();

    expect($tw->getTrendingWindowDays(30))->toBe(30);
    expect($tw->getTrendingWindowDays(7))->toBe(7);
});

it('AdaptiveTimeWindow expands to medium window when uploads below narrow threshold', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.adaptive_time_window', true);
    config()->set('early_growth.thresholds.uploads_per_day_narrow', 10);
    config()->set('early_growth.thresholds.uploads_per_day_wide', 3);
    config()->set('early_growth.thresholds.window_narrow_days', 7);
    config()->set('early_growth.thresholds.window_medium_days', 30);
    config()->set('early_growth.thresholds.window_wide_days', 90);

    // Mock: 5 uploads/day (between narrow=10 and wide=3) → 30 days
    Cache::put('egs.uploads_per_day', 5.0, 60);

    $tw = new AdaptiveTimeWindow();
    expect($tw->getTrendingWindowDays(7))->toBe(30);
});

it('AdaptiveTimeWindow expands to wide window when uploads below wide threshold', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.adaptive_time_window', true);
    config()->set('early_growth.thresholds.uploads_per_day_narrow', 10);
    config()->set('early_growth.thresholds.uploads_per_day_wide', 3);
    config()->set('early_growth.thresholds.window_narrow_days', 7);
    config()->set('early_growth.thresholds.window_medium_days', 30);
    config()->set('early_growth.thresholds.window_wide_days', 90);

    // Mock: 1 upload/day (below wide=3) → 90 days
    Cache::put('egs.uploads_per_day', 1.0, 60);

    $tw = new AdaptiveTimeWindow();
    expect($tw->getTrendingWindowDays(7))->toBe(90);
});

it('AdaptiveTimeWindow keeps narrow window when uploads above narrow threshold', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.adaptive_time_window', true);
    config()->set('early_growth.thresholds.uploads_per_day_narrow', 10);
    config()->set('early_growth.thresholds.uploads_per_day_wide', 3);
    config()->set('early_growth.thresholds.window_narrow_days', 7);
    config()->set('early_growth.thresholds.window_medium_days', 30);
    config()->set('early_growth.thresholds.window_wide_days', 90);

    // Mock: 15 uploads/day (above narrow=10) → normal 7-day window
    Cache::put('egs.uploads_per_day', 15.0, 60);

    $tw = new AdaptiveTimeWindow();
    expect($tw->getTrendingWindowDays(7))->toBe(7);
});

// ─── GridFiller ───────────────────────────────────────────────────────────────

it('GridFiller does nothing when EGS disabled', function () {
    config()->set('early_growth.enabled', false);

    $original = make_paginator(3);
    $gf       = new GridFiller();

    $result = $gf->fill($original, 12, 1);

    expect($result->getCollection()->count())->toBe(3);
});

it('GridFiller does not fill pages beyond page 1', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.grid_filler', true);

    $original = make_paginator(3, perPage: 12, page: 2);
    $gf       = new GridFiller();

    $result = $gf->fill($original, 12, 2);

    // Page > 1 → leave untouched
    expect($result->getCollection()->count())->toBe(3);
});

it('GridFiller fillCollection does nothing when EGS disabled', function () {
    config()->set('early_growth.enabled', false);

    $items = collect(range(1, 3))->map(fn ($i) => (object) ['id' => $i]);
    $gf    = new GridFiller();

    expect($gf->fillCollection($items, 12)->count())->toBe(3);
});

// ─── FeedBlender ─────────────────────────────────────────────────────────────

it('FeedBlender returns original paginator when EGS disabled', function () {
    config()->set('early_growth.enabled', false);

    $spotlight = Mockery::mock(SpotlightEngineInterface::class);
    $blender   = new FeedBlender($spotlight);

    $original = make_paginator(8);
    $result   = $blender->blend($original, 24, 1);

    expect($result->getCollection()->count())->toBe(8);
});

it('FeedBlender returns original paginator on page > 1', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);

    $spotlight = Mockery::mock(SpotlightEngineInterface::class);
    $blender   = new FeedBlender($spotlight);

    $original = make_paginator(8, page: 2);
    $result   = $blender->blend($original, 24, 2);

    expect($result->getCollection()->count())->toBe(8);
});

it('FeedBlender preserves original total in blended paginator', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'light');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.blend_ratios.light', ['fresh' => 0.60, 'curated' => 0.25, 'spotlight' => 0.15]);

    $spotlight = Mockery::mock(SpotlightEngineInterface::class);
    $spotlight->allows('getCurated')->andReturn(collect());
    $spotlight->allows('getSpotlight')->andReturn(collect());

    $blender  = new FeedBlender($spotlight);
    $original = make_paginator(6, total: 100);

    $result = $blender->blend($original, 24, 1);

    // Original total must be preserved so pagination links are stable
    expect($result->total())->toBe(100);
});

it('FeedBlender removes duplicate IDs across sources', function () {
    config()->set('early_growth.enabled', true);
    config()->set('early_growth.mode', 'aggressive');
    config()->set('early_growth.auto_disable.enabled', false);
    config()->set('early_growth.blend_ratios.aggressive', ['fresh' => 0.30, 'curated' => 0.50, 'spotlight' => 0.20]);

    // Curated returns some IDs that overlap with fresh
    $freshItems    = collect(range(1, 10))->map(fn ($i) => make_artwork_stub($i));
    $curatedItems  = collect(range(5, 15))->map(fn ($i) => make_artwork_stub($i));  // IDs 5-10 overlap
    $spotlightItems = collect(range(20, 25))->map(fn ($i) => make_artwork_stub($i));

    $spotlight = Mockery::mock(SpotlightEngineInterface::class);
    $spotlight->allows('getCurated')->andReturn($curatedItems);
    $spotlight->allows('getSpotlight')->andReturn($spotlightItems);

    $blender  = new FeedBlender($spotlight);
    $original = make_paginator(10, total: 100, items: $freshItems);

    $result         = $blender->blend($original, 24, 1);
    $ids            = $result->getCollection()->pluck('id')->toArray();
    $uniqueIds      = array_unique($ids);

    expect(count($ids))->toBe(count($uniqueIds));
});

// ─── Helpers ──────────────────────────────────────────────────────────────────

function make_paginator(
    int $count     = 12,
    int $total     = 0,
    int $perPage   = 24,
    int $page      = 1,
    ?\Illuminate\Support\Collection $items = null,
): LengthAwarePaginator {
    $collection = $items ?? collect(range(1, $count))->map(fn ($i) => make_artwork_stub($i));
    $total      = $total > 0 ? $total : $count;

    return new LengthAwarePaginator($collection->all(), $total, $perPage, $page, [
        'path' => '/discover/fresh',
    ]);
}

function make_artwork_stub(int $id): object
{
    return (object) [
        'id'           => $id,
        'title'        => "Artwork {$id}",
        'published_at' => now()->subDays($id),
    ];
}