package com.superbiz.agent.service;

import com.superbiz.agent.domain.entity.ToolInvocation;
import com.superbiz.agent.repository.ToolInvocationRepository;
import org.junit.jupiter.api.Test;

import java.util.List;
import java.util.Map;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

class ExecutorGatekeeperServiceTest {

    @Test
    void ruleCatalogLoadsDefaultMetadata() {
        GatekeeperRuleCatalog catalog = GatekeeperRuleCatalog.loadDefault(new com.fasterxml.jackson.databind.ObjectMapper());

        assertEquals("gatekeeper-rules-v1", catalog.version());
        assertFalse(catalog.auditRules().isEmpty());
        assertTrue(catalog.auditRules().stream()
                .anyMatch(rule -> "evidence.raw_path".equals(rule.get("id"))));
        assertEquals(0.5, catalog.doubleParameter("evidence.excerpt_mismatch",
                "min_token_overlap", 0.0), 0.001);
    }

    @Test
    void validatePassesForExecutorEvidenceV2WithMatchingInvocation() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]",
                        "HighCPUUsage firing, service=payment-service, current=92%, duration=25m")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_metrics", "$.alerts[0]",
                        "HighCPUUsage firing, service=payment-service, current=92%"),
                Map.of("status", "valid"));

        assertEquals("pass", result.get("status"));
        assertEquals("none", result.get("severity"));
        assertRuleAudit(result);
        assertTrue(((List<?>) result.get("failed_rules")).isEmpty());
    }

    @Test
    void validatePassesForNoEvidenceReference() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; evidence_status=no_evidence; query=inventory-service HikariCP; topic=application-logs; total=0; message=未找到匹配的日志")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; query=inventory-service HikariCP; total=0; evidence_status=no_evidence"),
                Map.of("status", "valid"));

        assertEquals("pass", result.get("status"));
        assertEquals("none", result.get("severity"));
        assertRuleAudit(result);
        assertTrue(((List<?>) result.get("failed_rules")).isEmpty());
    }

    @Test
    void validateBackfillsNoEvidenceInvocationByRawPathWhenToolHasMultipleCalls() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; evidence_status=no_evidence; query=inventory-service HikariCP; total=0; message=未找到匹配的日志"),
                invocation(102L, "query_logs", "$.logs[0]",
                        "order-service HikariCP active=50/50 waiting=32")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(null, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; query=inventory-service HikariCP; total=0; evidence_status=no_evidence",
                        "negative_observation"),
                Map.of("status", "valid"));

        assertEquals("pass", result.get("status"));
        assertEquals("none", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).isEmpty());
        assertEquals("evidence.invocation_auto_backfill_by_raw_path",
                ((Map<?, ?>) ((List<?>) result.get("warnings")).get(0)).get("rule"));
    }

    @Test
    void validateBackfillsNoEvidenceInvocationByExcerptWhenRawPathIsRepeated() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; evidence_status=no_evidence; query=service:inventory-service AND HikariCP; total=0; message=未找到匹配的日志"),
                invocation(102L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; evidence_status=no_evidence; query=inventory-service; total=0; message=未找到匹配的日志")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(null, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; query=service:inventory-service AND HikariCP; total=0; evidence_status=no_evidence",
                        "negative_observation"),
                Map.of("status", "valid"));

        assertEquals("pass", result.get("status"));
        assertEquals("none", result.get("severity"));
        assertEquals(101L,
                ((Map<?, ?>) ((List<?>) result.get("checked_bindings")).get(0)).get("source_invocation_id"));
    }

    @Test
    void validateRejectsNoEvidenceReferenceWhenExcerptClaimsPositiveEvidence() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.no_evidence",
                        "query_logs returned no evidence; evidence_status=no_evidence; query=inventory-service HikariCP; total=0; message=未找到匹配的日志")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_logs", "$.no_evidence",
                        "HikariCP active=50/50 waiting=32"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertRuleAudit(result);
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.excerpt_mismatch"));
    }

    @Test
    void validateRejectsPositiveBindingOnNegativeObservation() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.logs[0]",
                        "order-service HikariCP active=50/50 waiting=32")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_logs", "$.logs[0]",
                        "order-service HikariCP active=50/50 waiting=32",
                        "negative_observation"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.raw_path"));
    }

    @Test
    void validateFailsWhenRemovedFieldsArePresent() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of());
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);
        Map<String, Object> output = validOutput(101L, "query_metrics", "$.alerts[0]", "cpu=92");
        output.put("user_facing_answer", "旧版最终答案");

        Map<String, Object> result = service.validate("session-1", output, Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("schema.executor_v2"));
    }

    @Test
    void validateFailsForFabricatedInvocationId() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]", "cpu=92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(999L, "query_metrics", "$.alerts[0]", "cpu=92"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertRuleAudit(result);
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.invocation_ref"));
    }

    @Test
    void failResultIncludesRuleAuditMetadata() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.fail("gatekeeper.internal_error", "gatekeeper", "boom");

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertRuleAudit(result);
    }

    @Test
    void validateFailsForToolNameMismatch() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_logs", "$.logs[0]", "cpu=92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_metrics", "$.alerts[0]", "cpu=92"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.invocation_ref"));
    }

    @Test
    void validateDowngradesMissingRawPathToLowConfidence() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]", "cpu=92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);
        Map<String, Object> output = validOutput(101L, "query_metrics", null, "cpu=92");

        Map<String, Object> result = service.validate("session-1", output, Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("low_confid", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.raw_path"));
    }

    @Test
    void validateRejectsUnknownRawPath() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]", "cpu=92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_metrics", "$.alerts[99]", "cpu=92"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.raw_path"));
    }

    @Test
    void validateDowngradesOldInvocationWithoutEvidenceRefsToLowConfidence() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                ToolInvocation.builder().id(101L).sessionId("session-1").toolName("query_metrics")
                        .retrievalDetails("{\"evidence_status\":\"supported\"}")
                        .build()
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_metrics", "$.alerts[0]", "cpu=92"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("low_confid", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.missing"));
    }


    @Test
    void validateRejectsMismatchedExcerpt() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]", "HighCPUUsage firing service payment-service current 92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);

        Map<String, Object> result = service.validate("session-1",
                validOutput(101L, "query_metrics", "$.alerts[0]", "HikariCP active=50/50 waiting=32"),
                Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.excerpt_mismatch"));
    }

    @Test
    void validateFailsForRecommendedActionFabricatedInvocationId() {
        ToolInvocationRepository repository = mock(ToolInvocationRepository.class);
        when(repository.findBySessionIdOrderByIdAsc("session-1")).thenReturn(List.of(
                invocation(101L, "query_metrics", "$.alerts[0]", "cpu=92")
        ));
        ExecutorGatekeeperService service = new ExecutorGatekeeperService(repository);
        Map<String, Object> output = validOutput(101L, "query_metrics", "$.alerts[0]", "cpu=92");
        output.put("recommended_actions", List.of(Map.of(
                "action_text", "restart service",
                "reason", "alert is firing",
                "evidence_bindings", List.of(Map.of(
                        "source_type", "tool_trace",
                        "source_id", "trace-1",
                        "tool_name", "query_metrics",
                        "source_invocation_id", 999L,
                        "raw_path", "$.alerts[0]",
                        "evidence_excerpt", "cpu=92"
                ))
        )));

        Map<String, Object> result = service.validate("session-1", output, Map.of("status", "valid"));

        assertEquals("fail", result.get("status"));
        assertEquals("reject", result.get("severity"));
        assertTrue(((List<?>) result.get("failed_rules")).contains("evidence.invocation_ref"));
    }

    private ToolInvocation invocation(Long id, String toolName, String rawPath, String text) {
        return ToolInvocation.builder()
                .id(id)
                .sessionId("session-1")
                .toolName(toolName)
                .retrievalDetails("{\"evidence_refs\":[{\"raw_path\":\"" + rawPath
                        + "\",\"text\":\"" + text + "\"}]}")
                .build();
    }

    private Map<String, Object> validOutput(Long invocationId, String toolName, String rawPath, String excerpt) {
        return validOutput(invocationId, toolName, rawPath, excerpt, "symptom");
    }

    private Map<String, Object> validOutput(Long invocationId,
                                            String toolName,
                                            String rawPath,
                                            String excerpt,
                                            String claimType) {
        Map<String, Object> binding = new java.util.LinkedHashMap<>();
        binding.put("source_type", "tool_trace");
        binding.put("source_id", "trace-1");
        binding.put("tool_name", toolName);
        if (invocationId != null) {
            binding.put("source_invocation_id", invocationId);
        }
        if (rawPath != null) {
            binding.put("raw_path", rawPath);
        }
        binding.put("evidence_excerpt", excerpt);
        return new java.util.LinkedHashMap<>(Map.of(
                "answer_version", "executor_evidence_v2",
                "claims", List.of(Map.of(
                        "claim_id", "claim-1",
                        "claim_type", claimType,
                        "claim_text", "连接池 active 达到上限",
                        "support_level", "direct",
                        "evidence_bindings", List.of(binding)
                )),
                "hypotheses", List.of(),
                "recommended_actions", List.of(),
                "missing_info", List.of()
        ));
    }

    private void assertRuleAudit(Map<String, Object> result) {
        assertEquals("gatekeeper-rules-v1", result.get("rule_set_version"));
        assertTrue(result.get("rules") instanceof List<?>);
        List<?> rules = (List<?>) result.get("rules");
        assertFalse(rules.isEmpty());
        assertTrue(rules.stream().anyMatch(rule ->
                rule instanceof Map<?, ?> map && "evidence.raw_path".equals(map.get("id"))));
    }
}