from __future__ import annotations

import unittest

IMPORT_ERROR = None
try:
    import app
except ModuleNotFoundError as exc:  # pragma: no cover - environment dependent
    app = None
    IMPORT_ERROR = exc


@unittest.skipIf(app is None, f"app dependencies unavailable: {IMPORT_ERROR}")
class DataDecodingTests(unittest.TestCase):
    def test_compact_records_decode_and_invalid_indexes_are_safe(self):
        data = {"rp": ["Repo/A"], "fd": [["books"]], "rc": [[0, "novel", "pdf", 0, 12, 1], [4, "bad", "txt", 9, 0, 0], [0, "short"]]}
        self.assertEqual(app.decode_search_payload(data), [{
            "Repo": "Repo/A", "File": "novel", "Extension": "pdf",
            "Folder": ["books"], "Size": 12, "HasTxt": True,
        }, {
            "Repo": "", "File": "bad", "Extension": "txt",
            "Folder": [], "Size": 0, "HasTxt": False,
        }])

    def test_tree_decoding_derives_paths_and_toggle_semantics(self):
        result = app.decode_folder_tree_data({"Repo/A": [{"n": "root", "df": True, "ch": [{"n": "child", "df": True}]}]})["Repo/A"][0]
        self.assertTrue(result["isRoot"])
        self.assertEqual(result["path"], "")
        child = result["children"][0]
        self.assertEqual(child["path"], "child")
        self.assertFalse(child["showSelfToggle"])

    def test_legacy_long_tree_fields_are_not_decoded(self):
        result = app.decode_folder_tree_data({"Repo/A": [{"name": "legacy", "children": []}]})["Repo/A"][0]
        self.assertEqual(result["name"], "")

    def test_browser_decoding_preserves_folder_semantics_and_file_size(self):
        result = app.decode_folder_browser_data({"Repo/A": {"books": {"d": [{"n": "part", "c": 2}], "f": [{"n": "book", "e": "pdf", "s": 0}]}}})["Repo/A"]["books"]
        self.assertEqual(result["current_path"], "books")
        self.assertEqual(result["folders"][0]["path"], "books/part")
        self.assertEqual(result["files"][0]["size"], 0)

    def test_legacy_long_browser_fields_are_not_decoded(self):
        result = app.decode_folder_browser_data({"Repo/A": {"": {"folders": [{"name": "legacy"}], "files": []}}})["Repo/A"][""]
        self.assertEqual(result["folders"], [])

    def test_record_and_browser_names_do_not_duplicate_extensions(self):
        self.assertEqual(app.build_browser_file_name({"name": "book.PDF", "ext": "pdf"}), "book.PDF")
        self.assertEqual(app.build_browser_file_name({"name": "book", "ext": "pdf"}), "book.pdf")
        self.assertEqual(app.build_txt_relative_path({"File": "book", "Extension": "pdf", "Folder": ["a"]}), "a/book.txt")


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