import unittest

from app.features.memoir.memoir_images.parser import (
    build_initial_image_assets,
    parse_image_placeholders,
    parse_narrative_json,
    parse_narrative_to_sections,
)


class MemoirImageParserTest(unittest.TestCase):
    def test_parse_image_placeholders_preserves_order_and_offsets(self):
        content = (
            "那条路我一直记得。\n\n"
            "{{{{IMAGE:南方小镇的青石板路}}}}\n\n"
            "奶奶总坐在门口。\n\n"
            "{{{{IMAGE:奶奶坐在院子里的藤椅上}}}}"
        )

        items = parse_image_placeholders(content, max_images=3)

        self.assertEqual([item["index"] for item in items], [0, 1])
        self.assertEqual(items[0]["description"], "南方小镇的青石板路")
        self.assertEqual(
            items[1]["placeholder"], "{{{{IMAGE:奶奶坐在院子里的藤椅上}}}}"
        )
        self.assertLess(items[0]["start_offset"], items[1]["start_offset"])

    def test_build_initial_image_assets_marks_every_item_pending(self):
        placeholders = [
            {
                "index": 0,
                "description": "南方小镇的青石板路",
                "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}",
                "start_offset": 10,
            }
        ]

        assets = build_initial_image_assets(
            placeholders=placeholders,
            provider="liblib",
            style="watercolor",
            size="1024x1024",
            now_iso="2026-03-10T10:00:00Z",
        )

        self.assertEqual(assets[0]["status"], "pending")
        self.assertEqual(assets[0]["provider"], "liblib")
        self.assertEqual(assets[0]["url"], None)

    def test_parse_image_placeholders_accepts_double_brace_variant(self):
        content = "开头。\n\n{{IMAGE:1938年初的上海弄堂口，冬日萧瑟}}\n\n结尾。"

        items = parse_image_placeholders(content, max_images=2)

        self.assertEqual(len(items), 1)
        self.assertEqual(
            items[0]["placeholder"], "{{IMAGE:1938年初的上海弄堂口，冬日萧瑟}}"
        )
        self.assertEqual(items[0]["description"], "1938年初的上海弄堂口，冬日萧瑟")

    def test_parse_narrative_json_returns_sections_with_content_and_placeholder_info(
        self,
    ):
        raw = '{"paragraphs": [{"content": "那年春天。", "image_description": "南方小镇的青石板路"}, {"content": "奶奶坐在藤椅上。", "image_description": "奶奶的藤椅"}]}'
        segments = parse_narrative_json(raw)
        self.assertEqual(len(segments), 2)
        self.assertEqual(segments[0]["content"], "那年春天。")
        self.assertEqual(
            segments[0]["placeholder_info"]["description"], "南方小镇的青石板路"
        )
        self.assertEqual(segments[1]["content"], "奶奶坐在藤椅上。")
        self.assertEqual(segments[1]["placeholder_info"]["description"], "奶奶的藤椅")

    def test_parse_narrative_to_sections_prefers_json_then_fallback_to_placeholder(
        self,
    ):
        json_raw = (
            '{"paragraphs": [{"content": "段落一", "image_description": "图一"}]}'
        )
        segments = parse_narrative_to_sections(json_raw)
        self.assertEqual(len(segments), 1)
        self.assertEqual(segments[0]["content"], "段落一")
        self.assertEqual(segments[0]["placeholder_info"]["description"], "图一")

        placeholder_raw = "正文。\n\n{{{{IMAGE:描述}}}}\n\n结尾。"
        segments2 = parse_narrative_to_sections(placeholder_raw)
        self.assertEqual(len(segments2), 2)
        self.assertIn("正文", segments2[0]["content"])
        self.assertEqual(segments2[0]["placeholder_info"]["description"], "描述")