package com.baiyue.common.openapi;

import com.fasterxml.jackson.databind.type.TypeFactory;
import io.swagger.v3.core.converter.ModelConverter;
import io.swagger.v3.oas.models.Components;
import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.oas.models.info.Info;
import io.swagger.v3.oas.models.parameters.HeaderParameter;
import io.swagger.v3.oas.models.parameters.Parameter;
import io.swagger.v3.oas.models.security.SecurityRequirement;
import io.swagger.v3.oas.models.security.SecurityScheme;
import org.springdoc.core.customizers.OperationCustomizer;
import org.springdoc.core.models.GroupedOpenApi;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;

/**
 * OpenAPI 公共自动配置，根据服务配置生成统一的接口文档元数据和 JWT 安全方案。
 */
@AutoConfiguration
@EnableConfigurationProperties(OpenApiProperties.class)
@ConditionalOnProperty(prefix = "baiyue.openapi", name = "enabled", havingValue = "true", matchIfMissing = true)
public class BaiyueOpenApiAutoConfiguration {
    public static final String BEARER = "bearerAuth";

    @Bean
    OpenAPI baiyueOpenApi(OpenApiProperties p) {
        return new OpenAPI()
            .info(new Info().title(p.getTitle()).description(p.getDescription()).version(p.getVersion()))
            .components(new Components().addSecuritySchemes(BEARER,
                new SecurityScheme().name(BEARER).type(SecurityScheme.Type.HTTP)
                    .scheme("bearer").bearerFormat("JWT")))
            .addSecurityItem(new SecurityRequirement().addList(BEARER));
    }

    @Bean
    OperationCustomizer correlationHeaderCustomizer() {
        return (operation, method) -> operation
            .addParametersItem(header("X-Request-Id", "Request correlation ID / 请求关联 ID", false))
            .addParametersItem(header("X-Trace-Id", "Distributed trace ID / 分布式追踪 ID", false));
    }

    /** 保证 OpenAPI 与运行时 JSON 一致：所有 Java 长整型均声明为字符串。 */
    @Bean
    ModelConverter longAsStringModelConverter() {
        return (type, context, chain) -> {
            if (type.getType() != null) {
                Class<?> rawType = TypeFactory.defaultInstance().constructType(type.getType()).getRawClass();
                if (rawType == Long.class || rawType == Long.TYPE) {
                    return new io.swagger.v3.oas.models.media.StringSchema()
                            .description("长整型以字符串传输，避免浏览器精度丢失")
                            .example("190000000000000001");
                }
            }
            return chain.hasNext() ? chain.next().resolve(type, context, chain) : null;
        };
    }

    @Bean
    GroupedOpenApi platformApi(OperationCustomizer correlationHeaderCustomizer) {
        return GroupedOpenApi.builder().group("platform")
            .displayName("Platform APIs / 平台端接口")
            .pathsToMatch("/api/platform/**", "/api/auth/**", "/api/iam/platform/**")
            .addOperationCustomizer(correlationHeaderCustomizer).build();
    }

    @Bean
    GroupedOpenApi merchantApi(OperationCustomizer correlationHeaderCustomizer) {
        return GroupedOpenApi.builder().group("merchant")
            .displayName("Merchant APIs / 商户端接口")
            .pathsToMatch("/api/merchant/**", "/api/orders/**", "/api/warehouse/**",
                "/api/firstleg/**", "/api/lastleg/**")
            .addOperationCustomizer(correlationHeaderCustomizer).build();
    }

    @Bean
    GroupedOpenApi pdaApi(OperationCustomizer correlationHeaderCustomizer) {
        return GroupedOpenApi.builder().group("pda")
            .displayName("PDA APIs / PDA 作业接口")
            .pathsToMatch("/api/pda/**")
            .addOperationCustomizer(correlationHeaderCustomizer).build();
    }

    private Parameter header(String name, String description, boolean required) {
        return new HeaderParameter().name(name).description(description).required(required)
            .schema(new io.swagger.v3.oas.models.media.StringSchema());
    }
}