from pathlib import Path

from PIL import Image
from pptx import Presentation

from app.service.promotion_pdf_adapter import PromotionPdfAdapter
from app.service.promotion_renderer import PromotionPptxRenderer


def _draft(style_code: str = "balanced_allocation") -> dict[str, object]:
    return {
        "style_code": style_code,
        "subtitle": "测试产品 产品推介材料",
        "chapters": [
            {"title": "测试产品", "body": "仅供合规审核和专业投顾使用"},
            {"title": "产品基本信息", "body": "基金类型：混合型\n运作方式：开放式"},
            {"title": "收益与风险指标", "body": "最大回撤反映历史区间内的最大跌幅。"},
            {
                "title": "风险揭示",
                "body": (
                    "基金的过往业绩并不预示其未来表现，"
                    "基金管理人管理的其他基金的业绩并不构成基金业绩表现的保证。"
                ),
            },
        ],
    }


def test_renderer_creates_readable_pptx_with_fixed_slide_order(tmp_path: Path) -> None:
    output = tmp_path / "material.pptx"

    result = PromotionPptxRenderer().render(_draft(), output)

    assert result == str(output)
    assert output.is_file()
    presentation = Presentation(output)
    assert len(presentation.slides) == 4
    titles = [
        slide.shapes[1].text
        for slide in presentation.slides
        if len(slide.shapes) > 1 and hasattr(slide.shapes[1], "text")
    ]
    assert titles[:3] == ["测试产品", "产品基本信息", "收益与风险指标"]


def test_renderer_keeps_style_code_outside_content_layout(tmp_path: Path) -> None:
    first = tmp_path / "first.pptx"
    second = tmp_path / "second.pptx"

    PromotionPptxRenderer().render(_draft("steady_professional"), first)
    changed = _draft("steady_professional")
    changed["chapters"] = [
        {"title": "另一个标题", "body": "内容发生变化"},
        {"title": "第二页", "body": "第二组内容"},
    ]
    PromotionPptxRenderer().render(changed, second)

    first_presentation = Presentation(first)
    second_presentation = Presentation(second)
    assert first_presentation.slide_width == second_presentation.slide_width
    assert first_presentation.slide_height == second_presentation.slide_height


def test_pdf_adapter_does_not_claim_conversion_without_converter() -> None:
    adapter = PromotionPdfAdapter(enabled=False)

    assert adapter.convert("missing.pptx", "output.pdf") is None


def test_renderer_preserves_photo_aspect_ratio(tmp_path: Path) -> None:
    photo = tmp_path / "manager.png"
    Image.new("RGB", (800, 600), color="white").save(photo)
    output = tmp_path / "material-with-photo.pptx"

    PromotionPptxRenderer().render(_draft(), output, photo_path=str(photo))

    presentation = Presentation(output)
    picture = next(shape for shape in presentation.slides[0].shapes if shape.shape_type == 13)
    assert round(picture.width / picture.height, 2) == round(800 / 600, 2)


def test_renderer_applies_reference_palette_to_cover_and_content_slides(
    tmp_path: Path,
) -> None:
    output = tmp_path / "styled-material.pptx"

    PromotionPptxRenderer().render(_draft("steady_professional"), output)

    presentation = Presentation(output)
    cover = presentation.slides[0]
    content = presentation.slides[1]
    assert cover.shapes[0].fill.fore_color.rgb == (201, 76, 47)
    assert content.shapes[0].fill.fore_color.rgb == (255, 249, 242)