"""
Tests for Tool Governance System:
1. default_tools merge: agent without explicit tools gets read tools
2. RBAC matrix enforcement: deny without entitlement
3. Middleware:
   - max_chars_in enforced
   - redaction applied
   - allowlist blocks unknown host
4. release_check:
   - fixture diff with secret → gate fail
   - fixture openapi breaking → gate fail
   - pass case → gate pass
"""

import asyncio
import os
import sys
import pytest

# Add services/router to path for imports
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "services", "router"))
sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))


# ─── 1. default_tools merge ───────────────────────────────────────────────────

class TestDefaultToolsMerge:
    """Agent without explicit tools should get read tools automatically."""

    def test_unknown_agent_gets_read_tools(self):
        from agent_tools_config import get_agent_tools, reload_rollout_config
        reload_rollout_config()
        tools = get_agent_tools("brand_new_agent_xyz")
        # Must include baseline read tools
        for expected in ["repo_tool", "kb_tool", "oncall_tool", "observability_tool"]:
            assert expected in tools, f"Missing {expected} in tools for unknown agent"

    def test_sofiia_gets_cto_tools(self):
        from agent_tools_config import get_agent_tools, reload_rollout_config
        reload_rollout_config()
        tools = get_agent_tools("sofiia")
        for expected in [
            "pr_reviewer_tool", "contract_tool", "config_linter_tool",
            "threatmodel_tool", "job_orchestrator_tool",
        ]:
            assert expected in tools, f"Sofiia missing CTO tool: {expected}"

    def test_sofiia_gets_media_tools(self):
        from agent_tools_config import get_agent_tools, reload_rollout_config
        reload_rollout_config()
        tools = get_agent_tools("sofiia")
        assert "comfy_generate_image" in tools
        assert "comfy_generate_video" in tools

    def test_helion_gets_read_tools(self):
        from agent_tools_config import get_agent_tools, reload_rollout_config
        reload_rollout_config()
        tools = get_agent_tools("helion")
        for expected in ["repo_tool", "kb_tool", "oncall_tool", "job_orchestrator_tool"]:
            assert expected in tools

    def test_no_duplicates(self):
        from agent_tools_config import get_agent_tools, reload_rollout_config
        reload_rollout_config()
        tools = get_agent_tools("sofiia")
        assert len(tools) == len(set(tools)), "Duplicate tools in list"

    def test_stable_order(self):
        """get_agent_tools should return same order on repeated calls."""
        from agent_tools_config import get_agent_tools
        t1 = get_agent_tools("sofiia")
        t2 = get_agent_tools("sofiia")
        assert t1 == t2

    def test_get_agent_role(self):
        from agent_tools_config import get_agent_role
        assert get_agent_role("sofiia") == "agent_cto"
        assert get_agent_role("helion") == "agent_oncall"
        assert get_agent_role("unknown_xyz") == "agent_default"


# ─── 2. RBAC Matrix Enforcement ───────────────────────────────────────────────

class TestRBACMatrix:
    """Tool dispatch should deny calls without required entitlements."""

    def test_agent_cto_has_pr_review(self):
        from tool_governance import check_rbac
        ok, reason = check_rbac("sofiia", "pr_reviewer_tool", "review")
        assert ok, f"sofiia should have pr_review.use: {reason}"

    def test_agent_default_denied_pr_review_gate(self):
        """agent_default role does NOT have tools.pr_review.gate entitlement."""
        from tool_governance import check_rbac
        # Use a new/unknown agent that gets agent_default role
        ok, reason = check_rbac("brand_new_agent_xyz", "pr_reviewer_tool", "gate")
        assert not ok, "Default agent should NOT have gate entitlement"
        assert "Missing entitlements" in reason

    def test_agent_default_allowed_repo_read(self):
        from tool_governance import check_rbac
        ok, reason = check_rbac("brand_new_agent_xyz", "repo_tool", "read")
        assert ok, f"Default agent should have repo.read: {reason}"

    def test_agent_default_denied_incident_write(self):
        from tool_governance import check_rbac
        ok, reason = check_rbac("brand_new_agent_xyz", "oncall_tool", "incident_create")
        assert not ok, "Default agent should NOT have incident_write"

    def test_cto_allowed_incident_write(self):
        from tool_governance import check_rbac
        ok, reason = check_rbac("sofiia", "oncall_tool", "incident_create")
        assert ok, f"sofiia CTO should have incident_write: {reason}"

    def test_unknown_tool_allowed(self):
        """Tools not in matrix should not be blocked (no required entitlements)."""
        from tool_governance import check_rbac
        ok, _ = check_rbac("sofiia", "some_unknown_tool", "action")
        assert ok, "Tool not in matrix should pass (no requirements)"


# ─── 3. Middleware ────────────────────────────────────────────────────────────

class TestMiddleware:

    def test_max_chars_in_enforced(self):
        from tool_governance import check_input_limits
        oversized = "x" * 600_000  # 600KB > pr_reviewer_tool 400KB limit
        ok, reason, limits = check_input_limits("pr_reviewer_tool", oversized)
        assert not ok
        assert "too large" in reason.lower()

    def test_within_limit_passes(self):
        from tool_governance import check_input_limits
        small = "x" * 100
        ok, reason, limits = check_input_limits("pr_reviewer_tool", small)
        assert ok, f"Small input should pass: {reason}"

    def test_redaction_api_key(self):
        from tool_governance import redact
        text = 'api_key = "sk-abc123def456xyz789"'
        result = redact(text)
        assert "sk-abc123def456xyz789" not in result
        assert "REDACTED" in result

    def test_redaction_password(self):
        from tool_governance import redact
        text = "password = 'super_secret_123'"
        result = redact(text)
        assert "super_secret_123" not in result

    def test_redaction_empty_string(self):
        from tool_governance import redact
        assert redact("") == ""
        assert redact(None) is None

    def test_allowlist_blocks_unknown_host(self):
        from tool_governance import check_url_allowed
        ok, reason = check_url_allowed("oncall_tool", "http://evil.example.com/steal")
        assert not ok
        assert "not in allowlist" in reason.lower() or "no allowlist" in reason.lower()

    def test_allowlist_allows_localhost(self):
        from tool_governance import check_url_allowed
        ok, reason = check_url_allowed("oncall_tool", "http://localhost:9102/health")
        assert ok, f"localhost should be allowed: {reason}"

    def test_allowlist_blocks_private_ip_for_web_extract(self):
        from tool_governance import check_url_allowed
        ok, reason = check_url_allowed("web_extract", "https://192.168.1.1/admin")
        assert not ok, "Private IP should be blocked for web_extract"

    def test_allowlist_allows_public_url_for_web_extract(self):
        from tool_governance import check_url_allowed
        # web_extract has allow_any_public = true
        ok, reason = check_url_allowed("web_extract", "https://example.com/page")
        assert ok, f"Public URL should be allowed for web_extract: {reason}"


class TestPreCallGovernance:
    """Test the pre_call method of ToolGovernance."""

    def test_rbac_denial_in_pre_call(self):
        from tool_governance import ToolGovernance
        gov = ToolGovernance()
        pre = gov.pre_call(
            tool="pr_reviewer_tool",
            action="gate",
            agent_id="brand_new_agent_xyz",
        )
        assert not pre.allowed
        assert "RBAC" in pre.reason

    def test_allowed_call_returns_context(self):
        from tool_governance import ToolGovernance
        gov = ToolGovernance()
        pre = gov.pre_call(
            tool="repo_tool",
            action="read",
            agent_id="sofiia",
        )
        assert pre.allowed
        assert pre.call_ctx is not None
        assert pre.call_ctx.req_id

    def test_limits_denial_in_pre_call(self):
        from tool_governance import ToolGovernance
        gov = ToolGovernance()
        big_input = "x" * 600_000
        pre = gov.pre_call(
            tool="pr_reviewer_tool",
            action="review",
            agent_id="sofiia",
            input_text=big_input,
        )
        assert not pre.allowed
        assert "Limits exceeded" in pre.reason


# ─── 4. release_check ─────────────────────────────────────────────────────────

class FakeToolResult:
    def __init__(self, success, result=None, error=None):
        self.success = success
        self.result = result
        self.error = error


class MockToolManager:
    """Minimal mock for release_check_runner tests."""

    def __init__(self, responses: dict):
        self._responses = responses  # tool_name → result

    async def execute_tool(self, tool_name, arguments, agent_id=None, **kwargs):
        if tool_name in self._responses:
            return self._responses[tool_name]
        return FakeToolResult(success=True, result={})


class TestReleaseCheck:

    def _run(self, coro):
        return asyncio.run(coro)

    def test_fixture_diff_with_secret_fails_pr_review(self):
        """Diff containing a secret → pr_review gate fail → overall fail."""
        from release_check_runner import run_release_check

        # Simulate pr_reviewer_tool returning blocking issues
        tm = MockToolManager({
            "pr_reviewer_tool": FakeToolResult(
                success=True,
                result={"blocking_count": 1, "summary": "Secret detected", "score": 0},
            ),
            "config_linter_tool": FakeToolResult(
                success=True,
                result={"blocking_count": 0, "total_findings": 0},
            ),
            "threatmodel_tool": FakeToolResult(
                success=True,
                result={"unmitigated_high_count": 0},
            ),
        })

        inputs = {
            "service_name": "router",
            "diff_text": 'api_key = "sk-abc123def456xyz789"\n+password="secret"',
            "risk_profile": "default",
        }
        report = self._run(run_release_check(tm, inputs, "sofiia"))

        assert report["pass"] is False
        pr_gate = next(g for g in report["gates"] if g["name"] == "pr_review")
        assert pr_gate["status"] == "fail"

    def test_fixture_openapi_breaking_fails_contract(self):
        """Breaking OpenAPI change → contract_diff gate fail → overall fail."""
        from release_check_runner import run_release_check

        tm = MockToolManager({
            "pr_reviewer_tool": FakeToolResult(
                success=True, result={"blocking_count": 0},
            ),
            "config_linter_tool": FakeToolResult(
                success=True, result={"blocking_count": 0, "total_findings": 0},
            ),
            "contract_tool": FakeToolResult(
                success=True,
                result={"breaking_count": 2, "summary": "endpoint removed"},
            ),
            "threatmodel_tool": FakeToolResult(
                success=True, result={"unmitigated_high_count": 0},
            ),
        })

        inputs = {
            "service_name": "router",
            "diff_text": "minor change",
            "openapi_base": "openapi: 3.0.0\npaths:\n  /v1/health:\n    get: {}\n  /v1/agents:\n    get: {}",
            "openapi_head": "openapi: 3.0.0\npaths:\n  /v1/health:\n    get: {}",
            "risk_profile": "default",
        }
        report = self._run(run_release_check(tm, inputs, "sofiia"))

        assert report["pass"] is False
        contract_gate = next(g for g in report["gates"] if g["name"] == "contract_diff")
        assert contract_gate["status"] == "fail"
        assert contract_gate["breaking_count"] == 2

    def test_pass_case(self):
        """All gates pass → overall pass."""
        from release_check_runner import run_release_check

        tm = MockToolManager({
            "pr_reviewer_tool": FakeToolResult(
                success=True, result={"blocking_count": 0, "summary": "Clean"},
            ),
            "config_linter_tool": FakeToolResult(
                success=True, result={"blocking_count": 0, "total_findings": 0},
            ),
            "contract_tool": FakeToolResult(
                success=True, result={"breaking_count": 0},
            ),
            "threatmodel_tool": FakeToolResult(
                success=True, result={"unmitigated_high_count": 0},
            ),
        })

        inputs = {
            "service_name": "router",
            "diff_text": "+# simple comment\n",
            "openapi_base": "openapi: 3.0.0",
            "openapi_head": "openapi: 3.0.0",
            "risk_profile": "default",
        }
        report = self._run(run_release_check(tm, inputs, "sofiia"))

        assert report["pass"] is True
        for gate in report["gates"]:
            assert gate["status"] in ("pass", "skipped")

    def test_no_diff_skips_pr_review(self):
        """Empty diff_text causes pr_review gate to be skipped."""
        from release_check_runner import run_release_check

        tm = MockToolManager({
            "config_linter_tool": FakeToolResult(
                success=True, result={"blocking_count": 0, "total_findings": 0},
            ),
            "threatmodel_tool": FakeToolResult(
                success=True, result={"unmitigated_high_count": 0},
            ),
        })

        inputs = {"service_name": "router", "risk_profile": "default"}
        report = self._run(run_release_check(tm, inputs, "sofiia"))

        pr_gate = next((g for g in report["gates"] if g["name"] == "pr_review"), None)
        assert pr_gate is not None
        assert pr_gate["status"] == "skipped"

    def test_fail_fast_stops_at_first_failure(self):
        """fail_fast=true: stops after first failing gate."""
        from release_check_runner import run_release_check

        call_count = {"n": 0}

        class CountingMockTM:
            async def execute_tool(self, tool_name, arguments, agent_id=None, **kwargs):
                call_count["n"] += 1
                if tool_name == "pr_reviewer_tool":
                    return FakeToolResult(success=True, result={"blocking_count": 1})
                return FakeToolResult(success=True, result={"blocking_count": 0})

        inputs = {
            "service_name": "router",
            "diff_text": "something",
            "fail_fast": True,
        }
        report = asyncio.run(
            run_release_check(CountingMockTM(), inputs, "sofiia")
        )

        assert report["pass"] is False
        # With fail_fast, should have stopped early (only 1 tool call)
        assert call_count["n"] == 1

    def test_report_structure(self):
        """Report must contain pass, gates, recommendations, summary."""
        from release_check_runner import run_release_check

        tm = MockToolManager({
            "pr_reviewer_tool": FakeToolResult(success=True, result={"blocking_count": 0}),
            "config_linter_tool": FakeToolResult(success=True, result={"blocking_count": 0}),
            "threatmodel_tool": FakeToolResult(success=True, result={"unmitigated_high_count": 0}),
        })
        report = self._run(run_release_check(tm, {"service_name": "svc"}, "sofiia"))

        assert "pass" in report
        assert "gates" in report
        assert isinstance(report["gates"], list)
        assert "recommendations" in report
        assert "summary" in report
        assert "elapsed_ms" in report