"""tools/review_image_links.py: a dry run by default, changes only named images."""

import io
import json
import os
import shutil
import tempfile
import unittest
import unittest.mock

from PIL import Image
from PIL.PngImagePlugin import PngInfo

try:
    from tests.open_handles import assert_closed
except ImportError:  # discovered with tests/ as the top-level directory
    from open_handles import assert_closed

from database.operations import PromptDatabase
from tests.background_stops import close_handler
from tests.test_api_images import ImageAPITestCase
from tests.test_prompt_attribution import issue_graph, pair_evidence
from tools import review_image_links as tool
from utils.hashing import generate_prompt_hash


def png(path, prompt=None, evidence=None):
    info = PngInfo()
    if prompt is not None:
        info.add_text("prompt", json.dumps(prompt))
    if evidence is not None:
        info.add_text("comfyassets_prompt_pairs", json.dumps(evidence))
    Image.new("RGB", (4, 4)).save(path, pnginfo=info)


class ToolFixture(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.tmp, True)
        self.addCleanup(assert_closed, self, self.tmp)
        self.output = os.path.join(self.tmp, "output")
        os.makedirs(self.output)
        self.db_path = os.path.join(self.tmp, "prompts.db")
        db = PromptDatabase(self.db_path)
        try:
            save = lambda text: db.save_prompt(  # noqa: E731
                text=text, prompt_hash=generate_prompt_hash(text)
            )
            self.coffee = save("a woman holding a coffee cup")
            self.typed = save("snowy peaks")
            # The six #342 images: only prepend text, linked by the old fallback
            self.guessed = []
            for n in range(9, 12):
                path = os.path.join(self.output, f"moss_{n:05}_.png")
                png(path, issue_graph(), pair_evidence())
                self.guessed.append(
                    db.link_image_to_prompt(self.coffee, path, metadata={})
                )
            # A typed image linked to the wrong prompt, and a correct one
            wrong = os.path.join(self.output, "typed_wrong.png")
            png(wrong, issue_graph(text="snowy peaks"))
            self.wrong = db.link_image_to_prompt(self.coffee, wrong, metadata={})
            right = os.path.join(self.output, "typed_right.png")
            png(right, issue_graph(text="snowy peaks"))
            self.right = db.link_image_to_prompt(self.typed, right, metadata={})
            gone = os.path.join(self.output, "gone.png")
            self.gone = db.link_image_to_prompt(self.coffee, gone, metadata={})
        finally:
            db.close_all()

    def run_tool(self, *args):
        out = io.StringIO()
        code = tool.main([self.db_path, "--output-dir", self.output, *args], out=out)
        return code, out.getvalue()

    def links(self):
        db = PromptDatabase(self.db_path)
        try:
            rows = db.model.get_connection().execute(
                "SELECT id, prompt_id FROM generated_images"
            )
            return {row[0]: row[1] for row in rows}
        finally:
            db.close_all()


class ReviewToolTests(ToolFixture):
    def test_dry_run_judges_and_changes_nothing(self):
        before = self.links()
        ids = f"{self.guessed[0]}-{self.gone}"
        code, out = self.run_tool("--ids", ids, "--json")
        self.assertEqual(code, 0)
        verdicts = {v["image_id"]: v for v in json.loads(out.split("--apply, for")[0])}
        for image_id in self.guessed:
            self.assertEqual(verdicts[image_id]["verdict"], "unlink")
            self.assertEqual(verdicts[image_id]["sources"], {})
        self.assertEqual(verdicts[self.wrong]["verdict"], "relink")
        self.assertEqual(verdicts[self.wrong]["target"], self.typed)
        self.assertEqual(verdicts[self.right]["verdict"], "keep")
        self.assertEqual(verdicts[self.gone]["verdict"], "missing")
        self.assertIn("Dry run: nothing was changed.", out)
        self.assertEqual(self.links(), before)
        self.assertEqual(
            sorted(os.listdir(self.tmp)), ["output", "prompts.db"], "no side files"
        )

    def test_prompt_selection_and_text_report(self):
        code, out = self.run_tool("--prompt", str(self.coffee))
        self.assertEqual(code, 0)
        self.assertIn("unlink: 3", out)
        self.assertIn("relink: 1", out)
        self.assertIn("missing: 1", out)
        self.assertIn(f"-> {self.typed}", out)

    def test_apply_backs_up_then_changes_only_named_images(self):
        named = f"{self.guessed[0]}-{self.guessed[1]},{self.wrong}"
        code, out = self.run_tool(
            "--ids", named, "--prompt", str(self.coffee), "--apply"
        )
        self.assertEqual(code, 0)
        self.assertIn("Applied: 1 relinked, 2 unlinked, 0 skipped", out)
        links = self.links()
        self.assertNotIn(self.guessed[0], links)
        self.assertNotIn(self.guessed[1], links)
        self.assertEqual(links[self.guessed[2]], self.coffee, "not named: kept")
        self.assertEqual(links[self.wrong], self.typed)
        self.assertEqual(links[self.gone], self.coffee, "missing files are kept")
        backups = [n for n in os.listdir(self.tmp) if ".pre-relink_" in n]
        self.assertEqual(len(backups), 1)
        restored = PromptDatabase(os.path.join(self.tmp, backups[0]))
        try:
            count = (
                restored.model.get_connection()
                .execute("SELECT COUNT(*) FROM generated_images")
                .fetchone()[0]
            )
        finally:
            restored.close_all()
        self.assertEqual(count, 6)

    def test_arguments_are_validated(self):
        for args in (
            [],
            ["--ids", "5-2"],
            ["--ids", "x"],
            ["--prompt", "1", "--apply"],
        ):
            with self.subTest(args=args), self.assertRaises(SystemExit):
                with unittest.mock.patch("sys.stderr", io.StringIO()):
                    self.run_tool(*args)
        with (
            self.assertRaises(SystemExit),
            unittest.mock.patch("sys.stderr", io.StringIO()),
        ):
            tool.main(
                [os.path.join(self.tmp, "none.db"), "--output-dir", "x", "--ids", "1"]
            )
        self.assertEqual(tool.parse_ids(" 3, 1-2 ,"), [1, 2, 3])

    def test_conflicting_sources_are_left_to_the_maintainer(self):
        db = PromptDatabase(self.db_path)
        handler = tool.ImageGenerationHandler(db, None)
        try:
            row = {
                "id": 1,
                "prompt_id": self.coffee,
                "image_path": os.path.join(self.output, "typed_right.png"),
            }
            with unittest.mock.patch.object(
                tool, "certain_prompts", return_value={"scan": 1, "history": 2}
            ):
                verdict = tool.judge(db, handler, row, self.output)
        finally:
            close_handler(self, handler)
            db.close_all()
        self.assertEqual(verdict["verdict"], "conflict")


class ApplyGuardTests(ToolFixture):
    """M6: unlink clears only the link, and only the link it was judged on."""

    def test_unlink_skips_a_row_linked_elsewhere_since_the_review(self):
        db = PromptDatabase(self.db_path)
        try:
            verdicts = tool.review(db, [self.guessed[0]], None, self.output)
            self.assertEqual(verdicts[0]["verdict"], "unlink")
            db.model.get_connection().execute(
                "UPDATE generated_images SET prompt_id=? WHERE id=?",
                (self.typed, self.guessed[0]),
            )
            db.model.get_connection().commit()
            result = tool.apply(db, verdicts, [self.guessed[0]])
        finally:
            db.close_all()
        self.assertEqual(result["unlinked"], 0)
        self.assertEqual(self.links()[self.guessed[0]], self.typed)

    def test_unlink_keeps_the_file_and_its_favorite(self):
        path = os.path.join(self.output, "moss_00009_.png")
        db = PromptDatabase(self.db_path)
        try:
            db.set_image_favorite("a" * 64, "moss_00009_.png")
        finally:
            db.close_all()
        self.run_tool("--ids", str(self.guessed[0]), "--apply")
        self.assertTrue(os.path.isfile(path))
        db = PromptDatabase(self.db_path)
        try:
            self.assertEqual(db.get_root_favorites("a" * 64), {"moss_00009_.png"})
            summary = db.get_image_link_summaries([path]).get(path) or {}
        finally:
            db.close_all()
        self.assertNotEqual(summary.get("status"), "linked")

    def test_dry_run_states_what_apply_does(self):
        _code, out = self.run_tool("--ids", str(self.guessed[0]))
        self.assertIn("removes only the image's link record", out)
        self.assertIn("file stays on disk and in the gallery as unlinked", out)


class GalleryAfterUnlinkTests(ImageAPITestCase):
    """M6: after --apply the file is still listed, as an unlinked image."""

    async def test_unlinked_file_stays_in_the_workspace_gallery(self):
        db = self.api.db
        prompt = db.save_prompt(
            text="a woman holding a coffee cup",
            prompt_hash=generate_prompt_hash("a woman holding a coffee cup"),
        )
        path = self.output_dir / "moss_00009_.png"
        png(str(path), issue_graph(), pair_evidence())
        image_id = db.link_image_to_prompt(prompt, str(path), metadata={})
        out = io.StringIO()
        tool.main(
            [
                db.model.db_path,
                "--output-dir",
                str(self.output_dir),
                "--ids",
                str(image_id),
                "--apply",
            ],
            out=out,
        )
        self.assertIn("Applied: 0 relinked, 1 unlinked", out.getvalue())
        response = await self.client.get(
            "/prompt_manager/images/output", params={"mode": "workspace"}
        )
        self.assertEqual(response.status, 200)
        images = {i["filename"]: i for i in (await response.json())["images"]}
        self.assertIn("moss_00009_.png", images)
        link = images["moss_00009_.png"].get("linked") or {}
        self.assertNotEqual(link.get("status"), "linked")


if __name__ == "__main__":
    unittest.main()