package com.nanri.aiimage.config;

import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * 任务 115：高频查询 EXPLAIN 索引审计（文档产出验证）。
 * 审计文档必须覆盖 history/progress/dashboard 三类高频查询的执行计划结论、
 * 候选索引清单（表/列/类型/收益/风险）、全表扫描标记、可重复执行步骤，
 * 且本任务明确不做 DDL（只审计，不加索引）。
 */
class ExplainIndexAuditDocTest {

    private static final Path AUDIT = Paths.get("src", "main", "resources", "..", "..", "..",
            "docs", "explain-index-audit.md").normalize();
    private static final Path FLYWAY_SPEC = Paths.get("src", "main", "resources", "..", "..", "..",
            "docs", "specs", "12-flyway-and-inspection.md").normalize();

    private static String read(Path path) throws IOException {
        return new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
    }

    private static List<String> linesOf(Path path) throws IOException {
        return List.of(read(path).split("\r?\n"));
    }

    private static String lineContaining(String content, String needle) {
        for (String line : content.split("\r?\n")) {
            if (line.contains(needle)) {
                return line;
            }
        }
        return null;
    }

    @Test
    void test_explain_history_plan() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("history"), "审计文档覆盖 history 查询");
        assertTrue(doc.contains("EXPLAIN"), "审计文档包含 EXPLAIN 执行计划记录");
    }

    @Test
    void test_explain_progress_plan() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("progress"), "审计文档覆盖 progress 查询");
    }

    @Test
    void test_explain_dashboard_plan() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("dashboard"), "审计文档覆盖 dashboard 查询");
        assertTrue(doc.contains("GROUP BY"), "dashboard 聚合查询计划已记录");
    }

    @Test
    void test_full_scan_detected() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("type=ALL") || doc.contains("全表扫描") || doc.contains("ALL")
                        || doc.contains("possible_keys") || doc.contains("扫描"),
                "审计文档记录执行计划扫描类型（full scan 标记）");
        String line = lineContaining(doc, "idx_file_job_task");
        assertTrue(line != null && line.contains("task_id"),
                "审计文档指出 task_id 前缀索引对 (module_type, job_type, task_id IN) 的局限");
    }

    @Test
    void test_index_candidates_listed() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("idx_file_job_module_type_task")
                        || doc.contains("module_type") && doc.contains("job_type") && doc.contains("task_id"),
                "候选索引清单含 (module_type, job_type, task_id) 组合");
        assertTrue(doc.contains("收益") && doc.contains("风险"),
                "候选索引清单含收益与风险说明");
    }

    @Test
    void test_plan_documented() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("biz_task_file_job"), "审计文档引用目标表");
        assertTrue(doc.contains("biz_file_task") || doc.contains("biz_file_result"),
                "审计文档引用业务任务/结果表");
    }

    @Test
    void test_plan_repeatable() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("EXPLAIN SELECT") || doc.contains("EXPLAIN")
                        && doc.contains("手工执行") || doc.contains("执行"),
                "审计文档包含可重复执行的 EXPLAIN SQL 步骤");
    }

    @Test
    void test_no_ddl_this_task() throws Exception {
        String audit = read(AUDIT);
        String spec = read(FLYWAY_SPEC);
        assertTrue(audit.contains("不做 DDL") || audit.contains("本任务无 DDL")
                        || audit.contains("不新增索引") || audit.contains("只审计"),
                "审计文档明确本任务不做 DDL");
        assertFalse(audit.contains("ALTER TABLE"),
                "审计文档不包含 ALTER TABLE（DDL 属于后续任务 116）");
        assertTrue(spec.contains("只读") || spec.contains("巡检"),
                "12 spec 巡检报表模式与审计文档对应");
    }

    @Test
    void test_audit_reflects_batch_loading_queries() throws Exception {
        String doc = read(AUDIT);
        assertTrue(doc.contains("findAssembleJobsByTaskIds"), "审计覆盖轻量进度 Job 批量查询");
        assertTrue(doc.contains("findAssembleJobsByResultIds"), "审计覆盖结果列表 Job 批量查询");
        assertTrue(doc.contains("selectMaps") || doc.contains("GROUP BY"), "审计覆盖 dashboard 聚合查询");
    }
}