package com.codechecker.cache.key;

import com.codechecker.cache.schema.SourceIndex;
import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.MethodCallExpr;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

/** Redis key 表达式静态模式推断单测（常量、format、拼接等）。 */
class RedisKeyResolverTest {

    @Test
    void resolvesStringFormatWithConstant() {
        String source = ""
                + "package demo;\n"
                + "public class AttendanceService {\n"
                + "  private static final String ATTENDANCE_BASE_SETTING_CACHE_KEY = "
                + "\"fbt:attendance:base_setting:cache:%s\";\n"
                + "  public void save(String tenantId) {\n"
                + "    String key = String.format(ATTENDANCE_BASE_SETTING_CACHE_KEY, tenantId);\n"
                + "  }\n"
                + "}\n";

        SourceIndex index = new SourceIndex();
        index.addSource(source);
        CompilationUnit cu = StaticJavaParser.parse(source);
        ClassOrInterfaceDeclaration clazz = cu.getType(0).asClassOrInterfaceDeclaration();
        MethodCallExpr formatCall = cu.findAll(MethodCallExpr.class).stream()
                .filter(m -> "format".equals(m.getNameAsString()))
                .findFirst()
                .orElseThrow(IllegalStateException::new);

        String pattern = new RedisKeyResolver(index).resolve(
                formatCall, clazz, index.get("demo.AttendanceService"));
        assertEquals("fbt:attendance:base_setting:cache:*", pattern);
    }

    @Test
    void resolvesConstantConcatAndBuildMethod() {
        String source = ""
                + "package jnpf.util;\n"
                + "public class TenantDbContentCacheHelper {\n"
                + "  private static final String CACHE_KEY_PREFIX = \"tenant:db:content:\";\n"
                + "  public String buildCacheKey(String encode) {\n"
                + "    return CACHE_KEY_PREFIX + encode;\n"
                + "  }\n"
                + "  public void cache(String encode) {\n"
                + "    String key = buildCacheKey(encode);\n"
                + "  }\n"
                + "}\n";

        SourceIndex index = new SourceIndex();
        index.addSource(source);
        CompilationUnit cu = StaticJavaParser.parse(source);
        ClassOrInterfaceDeclaration clazz = cu.getType(0).asClassOrInterfaceDeclaration();
        MethodCallExpr buildCall = cu.findAll(MethodCallExpr.class).stream()
                .filter(m -> "buildCacheKey".equals(m.getNameAsString()))
                .findFirst()
                .orElseThrow(IllegalStateException::new);

        String pattern = new RedisKeyResolver(index).resolve(
                buildCall, clazz, index.get("jnpf.util.TenantDbContentCacheHelper"));
        assertEquals("tenant:db:content:*", pattern);
    }

    @Test
    void resolvesLocalVariableAssignedFromStringFormat() {
        String source = ""
                + "package demo;\n"
                + "public class CombinationRepo {\n"
                + "  private static final String COMBINATION_QUERY_KEY = "
                + "\"data_analysis:combination_query_key:%s:%s\";\n"
                + "  public void write(String tenantId, String hashKey) {\n"
                + "    String key = String.format(COMBINATION_QUERY_KEY, tenantId, hashKey);\n"
                + "    redisSet(key);\n"
                + "  }\n"
                + "  void redisSet(String k) {}\n"
                + "}\n";

        SourceIndex index = new SourceIndex();
        index.addSource(source);
        CompilationUnit cu = StaticJavaParser.parse(source);
        ClassOrInterfaceDeclaration clazz = cu.getType(0).asClassOrInterfaceDeclaration();
        // redisSet(key) 的实参 key —— 局部变量使用点
        MethodCallExpr redisSet = cu.findAll(MethodCallExpr.class).stream()
                .filter(m -> "redisSet".equals(m.getNameAsString()))
                .findFirst()
                .orElseThrow(IllegalStateException::new);
        Expression keyArg = redisSet.getArgument(0);

        String pattern = new RedisKeyResolver(index).resolve(
                keyArg, clazz, index.get("demo.CombinationRepo"));
        assertEquals("data_analysis:combination_query_key:*:*", pattern);
    }

    @Test
    void localReassignmentUsesNearestBindingBeforeUse() {
        String source = ""
                + "package demo;\n"
                + "public class ReassignRepo {\n"
                + "  private static final String A = \"prefix:a:%s\";\n"
                + "  private static final String B = \"prefix:b:%s\";\n"
                + "  public void write(String id) {\n"
                + "    String key = String.format(A, id);\n"
                + "    key = String.format(B, id);\n"
                + "    redisSet(key);\n"
                + "  }\n"
                + "  void redisSet(String k) {}\n"
                + "}\n";

        SourceIndex index = new SourceIndex();
        index.addSource(source);
        CompilationUnit cu = StaticJavaParser.parse(source);
        ClassOrInterfaceDeclaration clazz = cu.getType(0).asClassOrInterfaceDeclaration();
        MethodCallExpr redisSet = cu.findAll(MethodCallExpr.class).stream()
                .filter(m -> "redisSet".equals(m.getNameAsString()))
                .findFirst()
                .orElseThrow(IllegalStateException::new);

        String pattern = new RedisKeyResolver(index).resolve(
                redisSet.getArgument(0), clazz, index.get("demo.ReassignRepo"));
        assertEquals("prefix:b:*", pattern);
    }

    @Test
    void staticConstantStillPreferredOverLocalNameCollision() {
        // 局部变量名与静态常量同名时：仍优先静态常量（保持旧语义）
        String source = ""
                + "package demo;\n"
                + "public class Collision {\n"
                + "  private static final String KEY = \"const:prefix:%s\";\n"
                + "  public void write(String id) {\n"
                + "    String KEY = \"local:\" + id;\n"
                + "    redisSet(KEY);\n"
                + "  }\n"
                + "  void redisSet(String k) {}\n"
                + "}\n";

        SourceIndex index = new SourceIndex();
        index.addSource(source);
        CompilationUnit cu = StaticJavaParser.parse(source);
        ClassOrInterfaceDeclaration clazz = cu.getType(0).asClassOrInterfaceDeclaration();
        MethodCallExpr redisSet = cu.findAll(MethodCallExpr.class).stream()
                .filter(m -> "redisSet".equals(m.getNameAsString()))
                .findFirst()
                .orElseThrow(IllegalStateException::new);

        String pattern = new RedisKeyResolver(index).resolve(
                redisSet.getArgument(0), clazz, index.get("demo.Collision"));
        assertEquals("const:prefix:%s", pattern);
    }
}