"""最终海报文件校验与画布分流回归测试。"""
import io
import sys
from pathlib import Path

import pytest
from PIL import Image

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT / "api"))


def _png(width: int, height: int) -> bytes:
    buffer = io.BytesIO()
    Image.new("RGB", (width, height), "white").save(buffer, format="PNG")
    return buffer.getvalue()


def test_single_rendered_png_requires_exact_output_dimensions():
    from insurance.poster.render_validation import validate_rendered_png

    result = validate_rendered_png(_png(1024, 1536), "single_2_3")
    assert result == {"width": 1024, "height": 1536, "format": "PNG"}


def test_wrong_dimensions_and_corrupt_png_are_rejected():
    from insurance.poster.render_validation import PosterRenderValidationError, validate_rendered_png

    with pytest.raises(PosterRenderValidationError, match="尺寸不匹配"):
        validate_rendered_png(_png(1024, 1400), "single_2_3")
    with pytest.raises(PosterRenderValidationError, match="无法解码"):
        validate_rendered_png(b"\x89PNG\r\n\x1a\nnot-a-real-png", "single_2_3")


def test_long_rendered_png_requires_exact_width_and_safe_height():
    from insurance.poster.render_validation import PosterRenderValidationError, validate_rendered_png

    assert validate_rendered_png(_png(1242, 3600), "long_1242_auto")["height"] == 3600
    with pytest.raises(PosterRenderValidationError, match="宽度不匹配"):
        validate_rendered_png(_png(1080, 3600), "long_1242_auto")


def test_custom_long_height_requires_exact_output_height():
    from insurance.poster.render_validation import PosterRenderValidationError, validate_rendered_png

    result = validate_rendered_png(_png(1242, 4500), "long_1242_auto", expected_height=4500)
    assert result["height"] == 4500
    with pytest.raises(PosterRenderValidationError, match="自定义高度"):
        validate_rendered_png(_png(1242, 4600), "long_1242_auto", expected_height=4500)


def test_single_and_long_use_separate_canvas_components():
    stage = (ROOT / "frontend/src/components/poster/workspace/PosterStage.vue").read_text(encoding="utf-8")
    single_canvas = ROOT / "frontend/src/components/poster/single/PosterSingleCanvas.vue"

    assert single_canvas.exists()
    assert "<PosterSingleCanvas" in stage
    assert "v-if=\"draft.outputMode === 'single'\"" in stage
    assert "<PosterHtmlCanvas" in stage


def test_long_editor_exposes_custom_height_without_silent_crop():
    creative = (ROOT / "frontend/src/components/poster/workspace/PosterCreativePanel.vue").read_text(encoding="utf-8")
    stage = (ROOT / "frontend/src/components/poster/workspace/PosterStage.vue").read_text(encoding="utf-8")
    exporter = (ROOT / "frontend/src/utils/poster-exporter.ts").read_text(encoding="utf-8")

    assert "自定义高度" in creative
    assert ':custom-output-height="draft.longHeightMode === \'custom\' ? draft.customLongHeight : null"' in stage
    assert "当前内容超出自定义高度" in exporter


def test_background_generation_does_not_claim_final_poster_is_done():
    celery_source = (ROOT / "api/insurance/generation/celery_tasks.py").read_text(encoding="utf-8")
    service_source = (ROOT / "api/insurance/poster/service.py").read_text(encoding="utf-8")

    assert 'record.task_status = "background_ready"' in celery_source
    assert 'record.task_status = "done"' in service_source


def test_failed_client_composition_reuses_existing_background_and_exposes_stage_error():
    page = (ROOT / "frontend/src/pages/PosterPage.vue").read_text(encoding="utf-8")
    exporter = (ROOT / "frontend/src/utils/poster-exporter.ts").read_text(encoding="utf-8")

    assert "retryExistingComposite" in page
    assert "系统不会重新生成 AI 底图" in page
    assert "BACKGROUND_DECODE_FAILED" in page
    assert "ASSET_WAIT_FAILED" in page
    assert "RENDER_UPLOAD_FAILED" in page
    assert "CHART_RENDER_TIMEOUT" in exporter
    assert "OUTPUT_HEIGHT_UNSAFE" in exporter
    assert "cacheBust: false" in exporter


def test_final_client_export_submits_dom_manifest_before_download():
    page = (ROOT / "frontend/src/pages/PosterPage.vue").read_text(encoding="utf-8")
    exporter = (ROOT / "frontend/src/utils/poster-exporter.ts").read_text(encoding="utf-8")
    routes = (ROOT / "api/insurance/poster/routes.py").read_text(encoding="utf-8")

    assert "collectPosterExportManifest" in page
    assert "poster-export-manifest-v1" in exporter
    assert "data-poster-section" in exporter
    assert 'request.form.get("exportManifest")' in routes