"""Tests for gitea_client.py — the typed, sovereign API client.

gitea_client.py is 539 lines with zero tests in this repo (there are
tests in hermes-agent, but not here where it's actually used).

These tests cover:
  - All 6 dataclass from_dict() constructors (User, Label, Issue, etc.)
  - Defensive handling of missing/null fields from Gitea API
  - find_unassigned_issues() filtering logic
  - find_agent_issues() case-insensitive matching
  - GiteaError formatting
  - _repo_path() formatting
"""

from __future__ import annotations

import importlib.util
import sys
from pathlib import Path

import pytest

# Import gitea_client directly via importlib to avoid any sys.modules mocking
# from test_tasks_core which stubs gitea_client as a MagicMock.
REPO_ROOT = Path(__file__).parent.parent
_spec = importlib.util.spec_from_file_location(
    "gitea_client_real",
    REPO_ROOT / "gitea_client.py",
)
_gc = importlib.util.module_from_spec(_spec)
sys.modules["gitea_client_real"] = _gc
_spec.loader.exec_module(_gc)

User = _gc.User
Label = _gc.Label
Issue = _gc.Issue
Comment = _gc.Comment
PullRequest = _gc.PullRequest
PRFile = _gc.PRFile
GiteaError = _gc.GiteaError
GiteaClient = _gc.GiteaClient


# ═══════════════════════════════════════════════════════════════════════
# DATACLASS DESERIALIZATION
# ═══════════════════════════════════════════════════════════════════════

class TestUserFromDict:
    def test_full_user(self):
        u = User.from_dict({"id": 1, "login": "timmy", "full_name": "Timmy", "email": "t@t.com"})
        assert u.id == 1
        assert u.login == "timmy"
        assert u.full_name == "Timmy"
        assert u.email == "t@t.com"

    def test_minimal_user(self):
        """Missing fields default to empty."""
        u = User.from_dict({})
        assert u.id == 0
        assert u.login == ""

    def test_extra_fields_ignored(self):
        """Unknown fields from Gitea are silently ignored."""
        u = User.from_dict({"id": 1, "login": "x", "avatar_url": "http://..."})
        assert u.login == "x"


class TestLabelFromDict:
    def test_label(self):
        lb = Label.from_dict({"id": 5, "name": "bug", "color": "#ff0000"})
        assert lb.id == 5
        assert lb.name == "bug"
        assert lb.color == "#ff0000"


class TestIssueFromDict:
    def test_full_issue(self):
        issue = Issue.from_dict({
            "number": 42,
            "title": "Fix the bug",
            "body": "Please fix it",
            "state": "open",
            "user": {"id": 1, "login": "reporter"},
            "assignees": [{"id": 2, "login": "dev"}],
            "labels": [{"id": 3, "name": "bug"}],
            "comments": 5,
        })
        assert issue.number == 42
        assert issue.user.login == "reporter"
        assert len(issue.assignees) == 1
        assert issue.assignees[0].login == "dev"
        assert len(issue.labels) == 1
        assert issue.comments == 5

    def test_null_assignees_handled(self):
        """Gitea returns null for assignees sometimes — the exact bug
        that crashed find_unassigned_issues() before the defensive fix."""
        issue = Issue.from_dict({
            "number": 1,
            "title": "test",
            "body": None,
            "state": "open",
            "user": {"id": 1, "login": "x"},
            "assignees": None,
        })
        assert issue.assignees == []
        assert issue.body == ""

    def test_null_labels_handled(self):
        """Labels can also be null."""
        issue = Issue.from_dict({
            "number": 1,
            "title": "test",
            "state": "open",
            "user": {},
            "labels": None,
        })
        assert issue.labels == []

    def test_missing_user_defaults(self):
        """Issue with no user field doesn't crash."""
        issue = Issue.from_dict({"number": 1, "title": "t", "state": "open"})
        assert issue.user.login == ""


class TestCommentFromDict:
    def test_comment(self):
        c = Comment.from_dict({
            "id": 10,
            "body": "LGTM",
            "user": {"id": 1, "login": "reviewer"},
        })
        assert c.id == 10
        assert c.body == "LGTM"
        assert c.user.login == "reviewer"

    def test_null_body(self):
        c = Comment.from_dict({"id": 1, "body": None, "user": {}})
        assert c.body == ""


class TestPullRequestFromDict:
    def test_full_pr(self):
        pr = PullRequest.from_dict({
            "number": 99,
            "title": "Add feature",
            "body": "Description here",
            "state": "open",
            "user": {"id": 1, "login": "dev"},
            "head": {"ref": "feature-branch"},
            "base": {"ref": "main"},
            "mergeable": True,
            "merged": False,
            "changed_files": 3,
        })
        assert pr.number == 99
        assert pr.head_branch == "feature-branch"
        assert pr.base_branch == "main"
        assert pr.mergeable is True

    def test_null_head_base(self):
        """Handles null head/base objects."""
        pr = PullRequest.from_dict({
            "number": 1, "title": "t", "state": "open",
            "user": {}, "head": None, "base": None,
        })
        assert pr.head_branch == ""
        assert pr.base_branch == ""

    def test_null_merged(self):
        """merged can be null from Gitea."""
        pr = PullRequest.from_dict({
            "number": 1, "title": "t", "state": "open",
            "user": {}, "merged": None,
        })
        assert pr.merged is False


class TestPRFileFromDict:
    def test_pr_file(self):
        f = PRFile.from_dict({
            "filename": "src/main.py",
            "status": "modified",
            "additions": 10,
            "deletions": 3,
        })
        assert f.filename == "src/main.py"
        assert f.status == "modified"
        assert f.additions == 10
        assert f.deletions == 3


# ═══════════════════════════════════════════════════════════════════════
# ERROR HANDLING
# ═══════════════════════════════════════════════════════════════════════

class TestGiteaError:
    def test_error_formatting(self):
        err = GiteaError(404, "not found", "http://example.com/api/v1/repos/x")
        assert "404" in str(err)
        assert "not found" in str(err)

    def test_error_attributes(self):
        err = GiteaError(500, "internal")
        assert err.status == 500


# ═══════════════════════════════════════════════════════════════════════
# CLIENT HELPER METHODS
# ═══════════════════════════════════════════════════════════════════════

class TestClientHelpers:
    def test_repo_path(self):
        """_repo_path converts owner/name to API path."""
        client = GiteaClient.__new__(GiteaClient)
        assert client._repo_path("Timmy_Foundation/the-nexus") == "/repos/Timmy_Foundation/the-nexus"


# ═══════════════════════════════════════════════════════════════════════
# FILTERING LOGIC — find_unassigned_issues, find_agent_issues
# ═══════════════════════════════════════════════════════════════════════

class TestFindUnassigned:
    """Tests for find_unassigned_issues() filtering logic.

    These tests use pre-constructed Issue objects to test the filtering
    without making any API calls.
    """

    def _make_issue(self, number, assignees=None, labels=None, title="test"):
        return Issue(
            number=number, title=title, body="", state="open",
            user=User(id=0, login=""),
            assignees=[User(id=0, login=a) for a in (assignees or [])],
            labels=[Label(id=0, name=lb) for lb in (labels or [])],
        )

    def test_filters_assigned_issues(self):
        """Issues with assignees are excluded."""
        from unittest.mock import patch

        issues = [
            self._make_issue(1, assignees=["dev"]),
            self._make_issue(2),  # unassigned
        ]

        client = GiteaClient.__new__(GiteaClient)
        with patch.object(client, "list_issues", return_value=issues):
            result = client.find_unassigned_issues("repo")

        assert len(result) == 1
        assert result[0].number == 2

    def test_excludes_by_label(self):
        """Issues with excluded labels are filtered."""
        from unittest.mock import patch

        issues = [
            self._make_issue(1, labels=["wontfix"]),
            self._make_issue(2, labels=["bug"]),
        ]

        client = GiteaClient.__new__(GiteaClient)
        with patch.object(client, "list_issues", return_value=issues):
            result = client.find_unassigned_issues("repo", exclude_labels=["wontfix"])

        assert len(result) == 1
        assert result[0].number == 2

    def test_excludes_by_title_pattern(self):
        """Issues matching title patterns are filtered."""
        from unittest.mock import patch

        issues = [
            self._make_issue(1, title="[PHASE] Research AI"),
            self._make_issue(2, title="Fix login bug"),
        ]

        client = GiteaClient.__new__(GiteaClient)
        with patch.object(client, "list_issues", return_value=issues):
            result = client.find_unassigned_issues(
                "repo", exclude_title_patterns=["[PHASE]"]
            )

        assert len(result) == 1
        assert result[0].number == 2


class TestFindAgentIssues:
    """Tests for find_agent_issues() case-insensitive matching."""

    def test_case_insensitive_match(self):
        from unittest.mock import patch

        issues = [
            Issue(number=1, title="t", body="", state="open",
                  user=User(0, ""), assignees=[User(0, "Timmy")], labels=[]),
        ]

        client = GiteaClient.__new__(GiteaClient)
        with patch.object(client, "list_issues", return_value=issues):
            result = client.find_agent_issues("repo", "timmy")

        assert len(result) == 1

    def test_no_match_for_different_agent(self):
        from unittest.mock import patch

        issues = [
            Issue(number=1, title="t", body="", state="open",
                  user=User(0, ""), assignees=[User(0, "Timmy")], labels=[]),
        ]

        client = GiteaClient.__new__(GiteaClient)
        with patch.object(client, "list_issues", return_value=issues):
            result = client.find_agent_issues("repo", "claude")

        assert len(result) == 0