import unittest
from unittest.mock import Mock

from api.services.memoir_images.prompting import MemoirImagePromptService
from api.services.memoir_images.settings import MemoirImageSettings


class MemoirImagePromptingTest(unittest.TestCase):
    def test_prompt_service_uses_category_style_and_plain_fallback_without_llm(self):
        settings = MemoirImageSettings(
            enabled=True,
            max_per_chapter=2,
            provider="liblib",
            default_style="watercolor",
            default_size="1024x1024",
            poll_interval_seconds=3,
            max_attempts=20,
        )
        service = MemoirImagePromptService(llm=None, settings=settings)

        result = service.build_prompt(
            chapter_title="童年的夏天",
            chapter_category="childhood",
            description="奶奶坐在院子里的藤椅上",
            context_excerpt="梧桐树下很安静，夏天总有蝉鸣。",
        )

        self.assertEqual(result["style"], "watercolor")
        self.assertEqual(result["size"], "1024x1024")
        self.assertIn("奶奶坐在院子里的藤椅上", result["prompt"])
        self.assertIn("childhood", result["prompt_context"])

    def test_prompt_service_parses_structured_llm_response(self):
        settings = MemoirImageSettings(
            enabled=True,
            max_per_chapter=2,
            provider="liblib",
            default_style="watercolor",
            default_size="1024x1024",
            poll_interval_seconds=3,
            max_attempts=20,
        )
        llm = Mock()
        llm.invoke.return_value.content = (
            '{"prompt":"A grandmother in a quiet courtyard, summer cicadas, soft watercolor",'
            '"style":"watercolor","size":"1024x1024"}'
        )
        service = MemoirImagePromptService(llm=llm, settings=settings)

        result = service.build_prompt(
            chapter_title="童年的夏天",
            chapter_category="childhood",
            description="奶奶坐在院子里的藤椅上",
            context_excerpt="梧桐树下很安静，夏天总有蝉鸣。",
        )

        self.assertEqual(result["prompt"], "A grandmother in a quiet courtyard, summer cicadas, soft watercolor")
        self.assertEqual(result["style"], "watercolor")
        self.assertEqual(result["size"], "1024x1024")