"""Metadata scanning enriches known pairs and conservatively leaves conflicts."""

import json
from pathlib import Path

from tests.test_api_admin import AdminAPITestCase


def graph(positive="cat", negative="blur"):
    return {
        "1": {"class_type": "CLIPTextEncode", "inputs": {"text": positive}},
        "2": {"class_type": "CLIPTextEncode", "inputs": {"text": negative}},
        "3": {
            "class_type": "KSampler",
            "inputs": {"positive": ["1", 0], "negative": ["2", 0]},
        },
    }


class TestPairScan(AdminAPITestCase):
    def test_pair_scan_repeated_is_unchanged_and_empty_negative_is_supported(self):
        path = self.output_dir / "pair.png"
        meta = {"prompt": json.dumps(graph(negative=""))}
        self.assertEqual(self.api._ingest_scanned_file(path, meta), "added")
        self.assertEqual(self.api._ingest_scanned_file(path, meta), "unchanged")
        pairs = self.api.db.list_prompt_pairs()["pairs"]
        self.assertEqual(len(pairs), 1)
        self.assertEqual(pairs[0]["negative_text"], "")
        self.assertEqual(pairs[0]["run_count"], 0)

    def test_ambiguous_sampler_scan_does_not_save_a_guess(self):
        g = graph()
        g["4"] = {**g["3"]}
        meta = {"prompt": json.dumps(g)}
        self.assertEqual(
            self.api._ingest_scanned_file(self.output_dir / "multi.png", meta),
            "ambiguous",
        )
        self.assertEqual(self.api.db.list_prompt_pairs()["total"], 0)
        self.assertEqual(self.api.db.get_recent_prompts()["prompts"], [])

    def test_batch_exposes_pair_counts_and_actual_unchanged_status(self):
        meta = {"parameters": "cat\nNegative prompt: blur\nSteps: 20, Sampler: Euler"}
        batch = [(Path(self.output_dir / "a.png"), meta)]
        first = self.api._ingest_scan_batch_sync(batch)
        self.assertEqual(first["pairs_added"], 1)
        self.assertEqual(first["pair_links_added"], 1)
        second = self.api._ingest_scan_batch_sync(batch)
        self.assertEqual(second["unchanged"], 1)
        self.assertEqual(second["linked"], 0)
        self.assertEqual(second["pairs_added"], 0)

    def test_legacy_single_prompt_second_pass_not_reported_as_new_link(self):
        meta = {"prompt": json.dumps({"1": graph()["1"]})}
        path = self.output_dir / "old.png"
        self.assertEqual(self.api._ingest_scanned_file(path, meta), "added")
        self.assertEqual(self.api._ingest_scanned_file(path, meta), "unchanged")

    async def test_cancel_finishes_at_safe_boundary_and_restart_is_idempotent(self):
        from py.api.scan_job import ScanJob

        job = ScanJob()
        self.api._scan_job = job
        response = await self.client.post("/prompt_manager/scan/cancel")
        self.assertEqual(response.status, 200)
        self.assertTrue((await response.json())["cancellation_requested"])
        counts = self.api._ingest_scan_batch_sync(
            [(self.output_dir / "cancel.png", {"prompt": json.dumps(graph())})]
        )
        self.assertEqual(counts["processed"], 0)
        self.assertEqual(self.api.db.list_prompt_pairs()["total"], 0)
        job.finish()
        self.api._scan_job = ScanJob()
        first = self.api._ingest_scan_batch_sync(
            [(self.output_dir / "cancel.png", {"prompt": json.dumps(graph())})]
        )
        self.assertEqual(first["pairs_added"], 1)
        self.assertEqual(
            self.api._ingest_scan_batch_sync(
                [(self.output_dir / "cancel.png", {"prompt": json.dumps(graph())})]
            )["unchanged"],
            1,
        )