import unittest

from textbook.build_database import build, decl_name, resolve_proof, split_prelude, statement_identifiers

ENTRIES = [
    {"id": "goodman-1-6-1", "source_label": "Proposition 1.6.1", "kind": "proposition",
     "statement": "∀ (a : ℤ), a + 0 = a", "prelude": "import Mathlib",
     "natural_language": "Zero is an additive identity. [fix note: irrelevant]",
     "requires": ["Int.add_zero"], "elaborates": True},
    {"id": "goodman-1-6-24", "source_label": "Proposition 1.6.24", "kind": "proposition",
     "statement": "∀ (as : List ℤ), IsGCDOfList 1 as",
     "prelude": "import Mathlib\ndef IsGCDOfList (d : ℕ) (as : List ℤ) : Prop := True",
     "natural_language": "", "requires": [], "elaborates": True},
    {"id": "goodman-1-6-99", "source_label": "Proposition 1.6.99", "kind": "proposition",
     "statement": "∀ (as : List ℤ), IsGCDOfList 2 as",
     "prelude": "import Mathlib\ndef IsGCDOfList (d : ℕ) (as : List ℤ) : Prop := True",
     "natural_language": "", "requires": [], "elaborates": True},
]


class HelperTests(unittest.TestCase):
    def test_decl_name_is_a_legal_lean_identifier(self):
        self.assertEqual(decl_name('goodman-1-6-2-a'), 'goodman_1_6_2_a')

    def test_split_prelude_separates_imports_from_defs(self):
        imports, other = split_prelude('import Mathlib\ndef Foo := True')
        self.assertEqual(imports, ['import Mathlib'])
        self.assertEqual(other, 'def Foo := True')

    def test_statement_identifiers_skips_stopwords(self):
        self.assertNotIn('let', statement_identifiers('let x := 1'))
        self.assertIn('Nat.Prime', statement_identifiers('Nat.Prime p'))


class ResolveProofTests(unittest.TestCase):
    """A proof only counts once Lean has verified it -- this is the gate that keeps
    the library from claiming more than was actually checked."""

    def test_no_proof_is_asserted(self):
        self.assertEqual(resolve_proof({"id": "x"}), (None, 'asserted'))

    def test_unverified_proof_is_pending_not_proved(self):
        proof, status = resolve_proof({"id": "x", "proof": "ring", "proof_checked": False})
        self.assertEqual(status, 'proof_pending')
        self.assertIsNone(proof)

    def test_verified_proof_is_proved(self):
        proof, status = resolve_proof({"id": "x", "proof": "ring", "proof_checked": True})
        self.assertEqual((proof, status), ('ring', 'proved'))

    def test_successful_bench_run_proves_an_entry_with_no_recorded_proof(self):
        result = {"success": True, "attempts": [{"proof": "simp"}]}
        self.assertEqual(resolve_proof({"id": "x"}, result), ('simp', 'proved'))

    def test_failed_bench_run_does_not_prove(self):
        result = {"success": False, "attempts": []}
        self.assertEqual(resolve_proof({"id": "x"}, result), (None, 'asserted'))


class BuildDatabaseTests(unittest.TestCase):
    def test_unproven_entries_become_axioms(self):
        text, emitted, skipped = build(ENTRIES)
        self.assertIn('axiom goodman_1_6_1 :', text)
        self.assertNotIn('theorem goodman_1_6_1 :', text)
        self.assertEqual(len(emitted), 3)
        self.assertEqual(skipped, [])

    def test_proven_entries_become_real_theorems_with_their_proof(self):
        results = {"goodman-1-6-1": {"id": "goodman-1-6-1", "success": True,
                                      "attempts": [{"proof": "simp"}]}}
        text, _emitted, _skipped = build(ENTRIES, results)
        self.assertIn('theorem goodman_1_6_1 :', text)
        self.assertNotIn('axiom goodman_1_6_1 :', text)
        self.assertIn('  simp', text)
        self.assertIn('Proof verified by Lean.', text)

    def test_recorded_proof_is_only_emitted_once_checked(self):
        pending = [dict(ENTRIES[0], proof='ring', proof_checked=False)]
        text, _e, _s = build(pending)
        self.assertIn('axiom goodman_1_6_1 :', text)
        self.assertIn('not yet verified', text)

        checked = [dict(ENTRIES[0], proof='ring', proof_checked=True)]
        text, _e, _s = build(checked)
        self.assertIn('theorem goodman_1_6_1 :', text)
        self.assertIn('  ring', text)

    def test_shared_def_in_prelude_is_emitted_once_not_per_entry(self):
        # Two entries share the same `def`; declaring it twice in one Lean file is an
        # "already declared" error, so it must be hoisted and deduplicated.
        text, _emitted, _skipped = build(ENTRIES)
        self.assertEqual(text.count('def IsGCDOfList'), 1)
        self.assertEqual(text.count('import Mathlib'), 1)

    def test_require_checked_skips_unverified_entries(self):
        entries = [dict(ENTRIES[0]), dict(ENTRIES[1], elaborates=False)]
        text, emitted, skipped = build(entries, require_checked=True)
        self.assertEqual(emitted, ['goodman-1-6-1'])
        self.assertEqual(skipped, ['goodman-1-6-24'])
        self.assertNotIn('goodman_1_6_24', text)

    def test_docstring_records_provenance_and_axiom_warning(self):
        text, _emitted, _skipped = build(ENTRIES)
        self.assertIn('Proposition 1.6.1', text)
        self.assertIn('ASSERTED from the textbook', text)
        self.assertNotIn('fix note', text)


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