"""Unit tests for own-branch lock adoption decision (#442)."""
import sys
import unittest
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from issue_lock_adoption import (  # noqa: E402
    ADOPT,
    BLOCK_COMPETING,
    NO_MATCH,
    assess_own_branch_adoption,
    build_adoption_proof,
)

REQ = "feat/issue-420-server-code-parity"


class TestAssessOwnBranchAdoption(unittest.TestCase):
    def test_exact_own_branch_is_adopted(self):
        result = assess_own_branch_adoption(
            issue_number=420,
            requested_branch=REQ,
            existing_branches=[{"name": REQ, "commit_sha": "934688a"}],
        )
        self.assertEqual(result["outcome"], ADOPT)
        self.assertTrue(result["adopt"])
        self.assertFalse(result["block"])
        self.assertEqual(result["matched_branch"], REQ)
        self.assertEqual(result["matched_head_sha"], "934688a")

    def test_exact_own_branch_adopted_when_sha_missing(self):
        result = assess_own_branch_adoption(
            issue_number=420, requested_branch=REQ, existing_branches=[REQ]
        )
        self.assertEqual(result["outcome"], ADOPT)
        self.assertIsNone(result["matched_head_sha"])

    def test_different_branch_same_issue_blocks(self):
        result = assess_own_branch_adoption(
            issue_number=420,
            requested_branch=REQ,
            existing_branches=[{"name": "feat/issue-420-other-work"}],
        )
        self.assertEqual(result["outcome"], BLOCK_COMPETING)
        self.assertTrue(result["block"])
        self.assertFalse(result["adopt"])
        self.assertIn("feat/issue-420-other-work", result["competing_branches"])
        self.assertIn("fail closed", result["reason"])

    def test_own_branch_plus_competing_branch_blocks(self):
        # Ambiguous ownership: fail closed even though the exact branch exists.
        result = assess_own_branch_adoption(
            issue_number=420,
            requested_branch=REQ,
            existing_branches=[{"name": REQ}, {"name": "feat/issue-420-rogue"}],
        )
        self.assertEqual(result["outcome"], BLOCK_COMPETING)
        self.assertTrue(result["block"])
        self.assertEqual(result["competing_branches"], ["feat/issue-420-rogue"])

    def test_no_matching_branch_is_normal_path(self):
        result = assess_own_branch_adoption(
            issue_number=420,
            requested_branch=REQ,
            existing_branches=[{"name": "feat/issue-999-unrelated"}],
        )
        self.assertEqual(result["outcome"], NO_MATCH)
        self.assertFalse(result["block"])
        self.assertFalse(result["adopt"])

    def test_empty_branch_list_is_normal_path(self):
        result = assess_own_branch_adoption(
            issue_number=420, requested_branch=REQ, existing_branches=[]
        )
        self.assertEqual(result["outcome"], NO_MATCH)

    def test_substring_issue_number_not_falsely_matched_as_exact(self):
        # A different issue's branch must not be adopted as ours.
        result = assess_own_branch_adoption(
            issue_number=42,
            requested_branch="feat/issue-42-thing",
            existing_branches=[{"name": "feat/issue-420-server-code-parity"}],
        )
        # 'issue-42' is a substring of 'issue-420', so marker matches but the
        # name differs -> competing block, never adoption of the wrong branch.
        self.assertEqual(result["outcome"], BLOCK_COMPETING)
        self.assertNotEqual(result["matched_branch"], "feat/issue-420-server-code-parity")


class TestBuildAdoptionProof(unittest.TestCase):
    def test_proof_has_all_required_fields(self):
        assessment = assess_own_branch_adoption(
            issue_number=420,
            requested_branch=REQ,
            existing_branches=[{"name": REQ, "commit_sha": "934688a"}],
        )
        proof = build_adoption_proof(
            issue_number=420,
            branch_name=REQ,
            assessment=assessment,
            open_pr_checked=True,
            competing_lock_checked=True,
            lock_file_path="/tmp/gitea_issue_lock.json",
            lock_file_status="written",
        )
        for key in (
            "issue_number",
            "branch_name",
            "branch_head_commit",
            "adoption_reason",
            "no_existing_pr_proof",
            "no_competing_live_lock_proof",
            "lock_file_path",
            "lock_file_status",
        ):
            self.assertIn(key, proof)
        self.assertEqual(proof["branch_head_commit"], "934688a")
        self.assertTrue(proof["no_existing_pr_proof"])
        self.assertTrue(proof["no_competing_live_lock_proof"])


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