from __future__ import annotations

import unittest

from agent_harness.components import Candidate
from agent_harness.fusion import reciprocal_rank_fusion
from agent_harness.syntax_index import SyntaxRetriever, parse_go_file, parse_python_file


class SyntaxAndFusionTests(unittest.TestCase):
    def test_tree_sitter_extracts_and_retrieves_method(self) -> None:
        symbols = parse_go_file(
            "cache/client.go",
            "package cache\ntype Client struct{}\nfunc (c *Client) PresignHeadObject() error { return nil }\n",
        )
        names = {item.name for item in symbols}
        self.assertEqual(names, {"Client", "PresignHeadObject"})
        result = SyntaxRetriever(symbols).retrieve("HEAD presign cache object", 5)
        self.assertEqual(result[0].symbol, "cache/client.go::PresignHeadObject")

    def test_rrf_rewards_file_present_in_both_rankings(self) -> None:
        def candidate(path: str, source: str) -> Candidate:
            return Candidate(path, 1, 2, path, source, 1.0)

        first = [candidate("a.go", "lexical"), candidate("shared.go", "lexical")]
        second = [candidate("b.go", "dense"), candidate("shared.go", "dense")]
        fused = reciprocal_rank_fusion([first, second], 3)
        self.assertEqual(fused[0].path, "shared.go")

    def test_tree_sitter_extracts_and_retrieves_python_method(self) -> None:
        symbols = parse_python_file(
            "gitlab/client.py",
            "class Client:\n    def retry_request(self, url: str) -> bool:\n        return bool(url)\n",
        )
        names = {item.name for item in symbols}
        self.assertEqual(names, {"Client", "retry_request"})
        result = SyntaxRetriever(symbols).retrieve("retry client request", 5)
        self.assertEqual(result[0].symbol, "gitlab/client.py::retry_request")
        self.assertIn("retry_request", symbols[1].identifiers)

    def test_identifier_extraction_persists_after_first_declaration(self) -> None:
        symbols = parse_go_file(
            "demo.go",
            "package demo\nfunc First() { Second() }\nfunc Second() { First() }\n",
        )
        self.assertEqual([item.name for item in symbols], ["First", "Second"])
        self.assertIn("Second", symbols[0].identifiers)
        self.assertIn("First", symbols[1].identifiers)


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