"""Tests for snapshot saving, baseline management and approval workflow."""
import json
import pytest
from pathlib import Path
from scanner.baseline import BaselineManager, url_key


def _sample_page(url: str, text: str = "Inhalt") -> dict:
    return {
        "url": url,
        "final_url": url,
        "status": 200,
        "content_type": "text/html",
        "response_headers": {},
        "text": text,
        "links": {"a": [], "canonical": None, "meta_refresh": []},
        "metadata": {"title": "T", "h1": [], "h2": []},
        "hidden_content": [],
        "inline_scripts": [],
        "jsonld": [],
        "comment_links": [],
    }


@pytest.fixture
def bm(tmp_path: Path) -> BaselineManager:
    return BaselineManager(tmp_path / "data")


class TestUrlKey:
    def test_deterministic(self):
        assert url_key("https://example.com/") == url_key("https://example.com/")

    def test_different_urls_different_keys(self):
        assert url_key("https://a.com/") != url_key("https://b.com/")

    def test_16_hex_chars(self):
        k = url_key("https://example.com/")
        assert len(k) == 16
        assert all(c in "0123456789abcdef" for c in k)


class TestSaveSnapshot:
    def test_creates_manifest(self, bm, tmp_path):
        pages = [_sample_page("https://b.info/")]
        snap_dir = bm.save_snapshot(pages)
        assert (snap_dir / "manifest.json").exists()

    def test_manifest_content(self, bm):
        pages = [_sample_page("https://b.info/"), _sample_page("https://b.info/p/")]
        snap_dir = bm.save_snapshot(pages)
        manifest = json.loads((snap_dir / "manifest.json").read_text())
        assert manifest["page_count"] == 2
        assert "https://b.info/" in manifest["urls"]

    def test_creates_page_files(self, bm):
        pages = [_sample_page("https://b.info/")]
        snap_dir = bm.save_snapshot(pages)
        page_files = list((snap_dir / "pages").glob("*.json"))
        assert len(page_files) == 1

    def test_latest_snapshot_dir(self, bm):
        assert bm.latest_snapshot_dir() is None
        bm.save_snapshot([_sample_page("https://b.info/")])
        assert bm.latest_snapshot_dir() is not None


class TestLoadSnapshot:
    def test_loads_saved_snapshot(self, bm):
        pages = [_sample_page("https://b.info/"), _sample_page("https://b.info/p/")]
        bm.save_snapshot(pages)
        snap = bm.load_snapshot()
        assert "https://b.info/" in snap["pages"]
        assert "https://b.info/p/" in snap["pages"]

    def test_returns_empty_when_no_snapshot(self, bm):
        result = bm.load_snapshot()
        assert result == {}


class TestBaselineExists:
    def test_false_before_approve(self, bm):
        assert not bm.baseline_exists()

    def test_true_after_approve(self, bm):
        bm.save_snapshot([_sample_page("https://b.info/")])
        bm.approve_all(note="test")
        assert bm.baseline_exists()


class TestApproveAll:
    def test_approve_all_creates_baseline(self, bm):
        pages = [_sample_page("https://b.info/"), _sample_page("https://b.info/p/")]
        bm.save_snapshot(pages)
        approved = bm.approve_all(note="Initial baseline")
        assert "https://b.info/" in approved
        assert "https://b.info/p/" in approved
        assert bm.baseline_exists()

    def test_manifest_contains_approval_metadata(self, bm):
        bm.save_snapshot([_sample_page("https://b.info/")])
        bm.approve_all(note="test note", approved_by="testuser")
        manifest = json.loads((bm.baseline_dir / "manifest.json").read_text())
        assert manifest["note"] == "test note"
        assert manifest["approved_by"] == "testuser"
        assert "approved_at" in manifest

    def test_approve_all_raises_without_snapshot(self, bm):
        with pytest.raises(RuntimeError):
            bm.approve_all()


class TestApproveUrl:
    def test_approve_single_url(self, bm):
        pages = [_sample_page("https://b.info/"), _sample_page("https://b.info/p/")]
        bm.save_snapshot(pages)
        result = bm.approve_url("https://b.info/")
        assert result is True
        assert bm.baseline_exists()
        baseline = bm.load_baseline()
        assert "https://b.info/" in baseline["pages"]
        assert "https://b.info/p/" not in baseline["pages"]

    def test_approve_missing_url_returns_false(self, bm):
        bm.save_snapshot([_sample_page("https://b.info/")])
        result = bm.approve_url("https://b.info/does-not-exist/")
        assert result is False


class TestLoadBaseline:
    def test_loads_approved_pages(self, bm):
        pages = [_sample_page("https://b.info/", "Text A")]
        bm.save_snapshot(pages)
        bm.approve_all()
        baseline = bm.load_baseline()
        assert "https://b.info/" in baseline["pages"]
        assert baseline["pages"]["https://b.info/"]["text"] == "Text A"

    def test_never_auto_updates(self, bm):
        """Baseline must not change unless approve is explicitly called."""
        bm.save_snapshot([_sample_page("https://b.info/", "Original")])
        bm.approve_all()

        # Second snapshot with different content
        bm.save_snapshot([_sample_page("https://b.info/", "Manipuliert")])

        # Baseline must still contain original content
        baseline = bm.load_baseline()
        assert baseline["pages"]["https://b.info/"]["text"] == "Original"


class TestRebuildBaseline:
    def test_rebuild_replaces_baseline(self, bm):
        bm.save_snapshot([_sample_page("https://b.info/", "Alt")])
        bm.approve_all()

        bm.save_snapshot([_sample_page("https://b.info/", "Neu")])
        bm.rebuild_baseline(note="Major update")

        baseline = bm.load_baseline()
        assert baseline["pages"]["https://b.info/"]["text"] == "Neu"