import os
import sys
import unittest
import re
from unittest.mock import patch, MagicMock

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

from mcp_server import (
    gitea_list_prs,
    gitea_view_pr,
    gitea_review_pr,
    gitea_check_pr_eligibility,
)
import gitea_config

FAKE_AUTH = "Basic dGVzdDp0ZXN0"


def _final_page_fetch(items):
    return (items, {
        "page": 1,
        "per_page": 50,
        "returned_count": len(items),
        "has_more": False,
        "next_page": None,
        "is_final_page": True,
    })


class TestPRQueueInventory(unittest.TestCase):

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_author_profile_can_list_open_prs(self, mock_get_profile, _auth, mock_fetch):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read", "gitea.pr.comment"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([
            {"number": 1, "title": "PR 1", "state": "open", "head": {"ref": "branch1", "sha": "abc1"}, "base": {"ref": "master"}, "mergeable": True}
        ])
        result = gitea_list_prs(state="open", remote="prgs")
        self.assertEqual(len(result["prs"]), 1)
        self.assertEqual(result["prs"][0]["number"], 1)

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    @patch("gitea_config.is_runtime_switching_enabled", return_value=True)
    def test_author_profile_can_produce_pending_reviewer_queue_report(self, mock_switch, mock_get_profile, _auth, mock_api, mock_fetch):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([
            {
                "number": 1,
                "title": "PR 1",
                "state": "open",
                "head": {"ref": "branch1", "sha": "abc1"},
                "base": {"ref": "master"},
                "mergeable": True,
                "user": {"login": "jcwalker3"},
                "labels": [{"name": "bug"}],
                "body": "Fixes #10",
                "updated_at": "2026-07-05T10:00:00Z"
            },
            {
                "number": 2,
                "title": "PR 2",
                "state": "open",
                "head": {"ref": "branch2", "sha": "abc2"},
                "base": {"ref": "master"},
                "mergeable": True,
                "user": {"login": "other_user"},
                "labels": [],
                "body": "",
                "updated_at": "2026-07-05T11:00:00Z"
            }
        ])
        mock_api.return_value = {"login": "jcwalker3"} # whoami

        result = gitea_review_pr(pr_number=1, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        self.assertIn("=== PR Queue Inventory ===", result["message"])
        self.assertIn("Repository:", result["message"])
        self.assertIn("Open PRs found: 2", result["message"])
        self.assertIn("Review/merge blocked (Self-author). Requires a genuine non-author reviewer", result["message"])
        self.assertIn("Review/merge blocked (Current profile is Author)", result["message"])
        self.assertIn("gitea_activate_profile", result["message"])
        # updated_at surfaced for reconciliation (#166)
        self.assertIn("Updated: 2026-07-05T10:00:00Z", result["message"])

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_author_profile_never_calls_mutation_tools_during_inventory(self, mock_get_profile, _auth, mock_api, mock_fetch):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([])
        mock_api.return_value = {"login": "jcwalker3"}

        gitea_review_pr(pr_number=1, event="APPROVE", remote="prgs")
        for call in mock_api.call_args_list:
            method = call.args[0]
            self.assertEqual(method, "GET")

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_reviewer_profile_can_proceed_from_inventory_to_review_gates(self, mock_get_profile, _auth, mock_api, mock_fetch):
        mock_get_profile.return_value = {
            "profile_name": "gitea-reviewer",
            "allowed_operations": ["read", "approve", "review"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([
            {"number": 1, "title": "PR 1", "state": "open", "head": {"ref": "branch1", "sha": "abc1"}, "base": {"ref": "master"}, "mergeable": True, "user": {"login": "other_user"}}
        ])
        # mock_api: inventory whoami, eligibility whoami, eligibility PR,
        # POST review (#244: state + visible-verdict GET reviews).
        mock_api.side_effect = [
            {"login": "reviewer1"},
            {"login": "reviewer1"},
            {
                "user": {"login": "other_user"},
                "state": "open",
                "head": {"sha": "abc1"},
                "mergeable": True,
            },
            {"id": 100, "state": "APPROVED"},
            [
                {
                    "id": 100,
                    "user": {"login": "reviewer1"},
                    "state": "APPROVED",
                    "commit_id": "abc1",
                    "submitted_at": "2026-07-06T10:00:00Z",
                    "dismissed": False,
                }
            ],
        ]

        from mcp_server import init_review_decision_lock, gitea_mark_final_review_decision
        init_review_decision_lock("prgs", "review_pr")
        gitea_mark_final_review_decision(1, "approve", remote="prgs")
        result = gitea_review_pr(pr_number=1, event="APPROVE", remote="prgs", final_review_decision_ready=True)
        self.assertTrue(result["success"])
        self.assertIn("=== PR Queue Inventory ===", result["message"])
        self.assertIn("Repository:", result["message"])
        self.assertIn("Successfully submitted review", result["message"])

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    @patch("gitea_config.is_runtime_switching_enabled", return_value=False)
    def test_static_runtime_rejects_or_hides_profile_activation(self, mock_switch, mock_get_profile, _auth, mock_api, mock_fetch):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([])
        mock_api.return_value = {"login": "jcwalker3"}

        result = gitea_review_pr(pr_number=1, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        self.assertIn("Repository:", result["message"])
        self.assertNotIn("gitea_activate_profile", result["message"])
        self.assertIn("Switch to the reviewer MCP session", result["message"])

    @patch("mcp_server.get_profile")
    def test_stopped_before_listing_is_not_reported_as_no_prs(self, mock_get_profile):
        mock_get_profile.return_value = {
            "profile_name": "gitea-restricted",
            "allowed_operations": [],
            "forbidden_operations": [],
            "base_url": None,
        }
        result = gitea_review_pr(pr_number=1, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        self.assertIn("PR inventory not attempted", result["message"])
        self.assertNotIn("Open PRs found: 0", result["message"])

    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_reviewer_eligibility_check_not_run_for_author_profile(self, mock_get_profile, _auth, mock_api):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        result = gitea_check_pr_eligibility(pr_number=1, action="approve", remote="prgs")
        self.assertFalse(result["eligible"])
        self.assertEqual(mock_api.call_count, 0)

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_inventory_failure_output_is_redacted_no_raw_exception_leak(self, mock_get_profile, _auth, mock_api, mock_fetch):
        """Inventory failure path must use redaction and not leak raw exception text."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        # Exception contains something that should be redacted or not leaked raw
        mock_fetch.side_effect = Exception("connection error token supersecrettoken123 at https://internal.example/repo")
        mock_api.return_value = {"login": "jcwalker3"}

        result = gitea_review_pr(pr_number=42, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        msg = result.get("message", "")
        self.assertIn("=== PR Queue Inventory ===", msg)
        self.assertIn("Repository:", msg)
        self.assertIn("PR inventory failed:", msg)
        # raw secret and potentially sensitive details must not appear
        self.assertNotIn("supersecrettoken123", msg)
        self.assertNotIn("token=supersecrettoken123", msg)
        # uses project's redaction pattern (token prefix -> [REDACTED])
        # even if url leaks, the exception is redacted per pattern

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_inventory_failure_output_redacts_real_service_urls(self, mock_get_profile, _auth, mock_api, mock_fetch):
        """Failure paths must fully redact real service hostnames and URLs from inventory output."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.side_effect = Exception("failed to connect to https://gitea.prgs.cc/api/v1/repos/x")
        mock_api.return_value = {"login": "jcwalker3"}

        result = gitea_review_pr(pr_number=42, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        msg = result.get("message", "")
        self.assertIn("=== PR Queue Inventory ===", msg)
        self.assertIn("[REDACTED_URL]", msg)
        self.assertNotIn("gitea.prgs.cc", msg)

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_author_profiles_can_perform_read_only_pr_inventory(self, mock_get_profile, _auth, mock_api, mock_fetch):
        """Author profiles with read can perform read-only PR inventory (report produced, no mutations)."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([
            {"number": 7, "title": "Some PR", "state": "open", "head": {"ref": "f", "sha": "def"}, "base": {"ref": "master"}, "mergeable": True, "user": {"login": "someone"}, "labels": [], "body": ""}
        ])
        mock_api.return_value = {"login": "jcwalker3"}

        result = gitea_review_pr(pr_number=7, event="APPROVE", remote="prgs")
        self.assertFalse(result["success"])
        msg = result["message"]
        self.assertIn("=== PR Queue Inventory ===", msg)
        self.assertIn("Repository:", msg)
        self.assertIn("Open PRs found: 1", msg)
        # no mutation calls (covered by other test but reconfirm here)
        for call in mock_api.call_args_list:
            self.assertEqual(call.args[0], "GET")

    @patch("mcp_server._local_git_remote_url")
    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_empty_inventory_runs_trust_gate_and_blocks_without_trusted_empty(
        self, mock_get_profile, _auth, mock_api, mock_fetch, mock_local_url
    ):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([])
        mock_api.return_value = {"login": "jcwalker3"}
        mock_local_url.return_value = None

        result = gitea_review_pr(
            pr_number=1,
            event="APPROVE",
            remote="prgs",
            org="Scaled-Tech-Consulting",
            repo="Gitea-Tools",
        )
        self.assertFalse(result["success"])
        msg = result["message"]
        self.assertIn("pr_inventory_trust_gate.status: untrusted_empty", msg)
        self.assertIn("Empty-queue claim blocked", msg)
        self.assertNotIn("Open PRs found: 0 (trusted_empty)", msg)

    @patch("mcp_server._local_git_remote_url")
    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_empty_inventory_trusted_empty_when_gate_passes(
        self, mock_get_profile, _auth, mock_api, mock_fetch, mock_local_url
    ):
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([])
        mock_api.return_value = {"login": "jcwalker3"}
        mock_local_url.return_value = (
            "https://gitea.prgs.cc/Scaled-Tech-Consulting/Gitea-Tools.git"
        )

        result = gitea_review_pr(
            pr_number=1,
            event="APPROVE",
            remote="prgs",
            org="Scaled-Tech-Consulting",
            repo="Gitea-Tools",
        )
        self.assertFalse(result["success"])
        msg = result["message"]
        self.assertIn("pr_inventory_trust_gate.status: trusted_empty", msg)
        self.assertIn("Open PRs found: 0 (trusted_empty)", msg)

    @patch("mcp_server._local_git_remote_url")
    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_author_profiles_cannot_approve_request_changes_merge_or_bypass_gates(self, mock_get_profile, _auth, mock_api, mock_fetch, mock_local_url):
        """Author profiles still cannot approve, request_changes, merge, or bypass gates even with inventory."""
        mock_local_url.return_value = (
            "https://gitea.prgs.cc/Scaled-Tech-Consulting/Gitea-Tools.git"
        )
        for event in ["APPROVE", "REQUEST_CHANGES"]:
            mock_get_profile.return_value = {
                "profile_name": "gitea-author",
                "allowed_operations": ["read"],
                "forbidden_operations": [],
                "base_url": None,
            }
            mock_fetch.return_value = _final_page_fetch([])
            mock_api.return_value = {"login": "jcwalker3"}

            result = gitea_review_pr(pr_number=1, event=event, remote="prgs")
            self.assertFalse(result["success"])
            self.assertIn("Review/Merge Blocked", result["message"])
            self.assertIn("does not have review or merge permissions", result["message"])
            # ensure no mutation attempted
            mutation_calls = [c for c in mock_api.call_args_list if c.args[0] != "GET"]
            self.assertEqual(len(mutation_calls), 0)

        # quick check merge path is still hard-gated (via eligibility in submit, but author profile blocks early)
        # we already block before calling submit for non-reviewer

    # --- Requirement-5 conflict/staleness scenario tests (Issue #166 / #170) ---
    # These prove coverage for the five cases; they exercise live list/view
    # (with staleness fields added in #166) under mocked conflicting states.
    # Tests use direct list/view calls + inventory path to ensure fields and
    # live data are available for detection without trusting prior handoffs.

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_r5_s1_stale_prior_handoff_merged_but_live_pr_open(self, mock_get_profile, _auth, mock_fetch):
        """Scenario 1: stale prior handoff says merged but live PR list says open."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_fetch.return_value = _final_page_fetch([{
            "number": 99, "title": "Stale merge claim", "state": "open",
            "head": {"ref": "f99", "sha": "sha99"}, "base": {"ref": "master"},
            "mergeable": True, "user": {"login": "other"},
            "labels": [], "body": "Fixes #200",
            "updated_at": "2026-07-05T22:00:00Z"
        }])
        prs = gitea_list_prs(state="open", remote="prgs")
        self.assertEqual(len(prs["prs"]), 1)
        self.assertEqual(prs["prs"][0]["state"], "open")
        self.assertIn("updated_at", prs["prs"][0])  # enables staleness check vs prior "merged"

    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_r5_s2_prior_handoff_open_but_live_pr_closed(self, mock_get_profile, _auth, mock_api):
        """Scenario 2: prior handoff says open but live view says closed."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_api.return_value = {
            "number": 88, "title": "Closed but prior said open", "state": "closed",
            "head": {"ref": "f88"}, "base": {"ref": "master"},
            "mergeable": None, "body": "", "user": {"login": "u"},
            "updated_at": "2026-07-05T21:00:00Z",
            "merged_at": "2026-07-05T21:05:00Z",
            "merge_commit_sha": "m123", "closed_at": "2026-07-05T21:05:00Z"
        }
        pr = gitea_view_pr(pr_number=88, remote="prgs")
        self.assertEqual(pr["state"], "closed")
        self.assertIsNotNone(pr.get("closed_at"))
        # live closed would contradict prior "open" handoff

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_r5_s3_list_prs_and_view_pr_disagree(self, mock_get_profile, _auth, mock_api, mock_fetch):
        """Scenario 3: gitea_list_prs and gitea_view_pr disagree on state/details."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        # list says open
        mock_fetch.return_value = _final_page_fetch([{
            "number": 77, "title": "Disagree", "state": "open",
            "head": {"ref": "f77", "sha": "s77"}, "base": {"ref": "master"},
            "mergeable": True, "user": {"login": "x"},
            "labels": [], "body": "", "updated_at": "2026-07-05T23:00:00Z"
        }])
        # view says closed (simulating inconsistency)
        mock_api.return_value = {
            "number": 77, "title": "Disagree", "state": "closed",
            "head": {"ref": "f77"}, "base": {"ref": "master"},
            "mergeable": None, "body": "", "user": {"login": "x"},
            "updated_at": "2026-07-05T23:01:00Z",
            "merged_at": None, "merge_commit_sha": None, "closed_at": None
        }
        listed = gitea_list_prs(state="open", remote="prgs")
        viewed = gitea_view_pr(pr_number=77, remote="prgs")
        self.assertEqual(listed["prs"][0]["state"], "open")
        self.assertEqual(viewed["state"], "closed")
        # caller must reconcile; mismatch is hard blocker per rules

    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_r5_s4_merge_commit_missing_after_claimed_merge(self, mock_get_profile, _auth, mock_api):
        """Scenario 4: merge commit missing after claimed merge."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        mock_api.return_value = {
            "number": 55, "title": "Claimed merge no commit", "state": "closed",
            "head": {"ref": "f55"}, "base": {"ref": "master"},
            "mergeable": False, "body": "Fixes #55",
            "user": {"login": "u"},
            "updated_at": "2026-07-05T20:10:00Z",
            "merged_at": "2026-07-05T20:09:00Z",
            "merge_commit_sha": None,  # missing!
            "closed_at": "2026-07-05T20:09:00Z"
        }
        pr = gitea_view_pr(pr_number=55, remote="prgs")
        self.assertEqual(pr["state"], "closed")
        self.assertIsNone(pr.get("merge_commit_sha"))
        # post-merge view must surface missing commit for detection

    @patch("mcp_server.api_fetch_page")
    @patch("mcp_server.api_request")
    @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
    @patch("mcp_server.get_profile")
    def test_r5_s5_linked_issue_remains_open_after_claimed_merge(self, mock_get_profile, _auth, mock_api, mock_fetch):
        """Scenario 5: linked issue remains open after claimed merge."""
        mock_get_profile.return_value = {
            "profile_name": "gitea-author",
            "allowed_operations": ["read"],
            "forbidden_operations": [],
            "base_url": None,
        }
        # PR claims merge, links #300
        mock_fetch.return_value = _final_page_fetch([{
            "number": 300, "title": "PR for #300", "state": "closed",
            "head": {"ref": "f300", "sha": "s3"}, "base": {"ref": "master"},
            "mergeable": True, "user": {"login": "u"},
            "labels": [], "body": "Fixes #300", "updated_at": "2026-07-05T20:20:00Z"
        }])
        # But linked issue (via list_issues or view) still open - here we use view_pr body to confirm link
        # For this test we assert the PR data shows link, caller must check issue state live
        mock_api.return_value = {
            "number": 300, "title": "PR for #300", "state": "closed",
            "head": {"ref": "f300"}, "base": {"ref": "master"},
            "mergeable": False, "body": "Fixes #300",
            "user": {"login": "u"},
            "updated_at": "2026-07-05T20:20:00Z",
            "merged_at": "2026-07-05T20:21:00Z", "merge_commit_sha": "mc300", "closed_at": "2026-07-05T20:21:00Z"
        }
        prs = gitea_list_prs(state="closed", remote="prgs")
        pr = gitea_view_pr(pr_number=300, remote="prgs")
        self.assertIn("#300", pr.get("body", ""))
        self.assertIsNotNone(pr.get("merge_commit_sha"))
        # real impl must cross-check live issue #300 state != closed or label still in-progress