package com.baiyue.lastleg.schema;

import org.junit.jupiter.api.Test;

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.Locale;

import static org.assertj.core.api.Assertions.assertThat;

class Phase5OverseasUpgradeSqlContractTest {
    private static final List<String> PHASE5_TABLES = List.of(
        "ll_dispatch_pda_task", "ll_dispatch_pda_pick", "ll_dispatch_pda_operation",
        "ll_dispatch_pda_pick_order", "ll_outbound_order", "ll_outbound_pallet_item",
        "ll_outbound_pda_task", "ll_outbound_pda_pick", "ll_delivery_order",
        "ll_delivery_operation", "ll_dropship_order_profile", "ll_dropship_carton",
        "ll_dropship_sku_inventory", "ll_dropship_carton_ledger", "ll_exception_order",
        "ll_exception_return_item", "ll_exception_order_command", "ll_customer_visit");

    @Test
    void overseasFixedEntryCreatesEveryPhase5TableExactlyOnce() throws Exception {
        String overseas = repositoryFile("deploy/sql/海外区域统一增量-MySQL8.sql");

        for (String table : PHASE5_TABLES) {
            String create = "CREATE TABLE " + table + " (";
            assertThat(overseas.indexOf(create)).as(table).isGreaterThanOrEqualTo(0);
            assertThat(count(overseas, create)).as(table).isEqualTo(1);
            assertThat(overseas.indexOf(table)).as(table + " first reference")
                .isEqualTo(overseas.indexOf(create) + "CREATE TABLE ".length());
        }
        assertThat(overseas).doesNotContain("assert_phase5_lastleg_identifiers_migratable", "ALTER TABLE ll_");
    }

    @Test
    void overseasFixedEntryContainsFinalPhase5ShapesWithoutMigrationBackfill() throws Exception {
        String overseas = repositoryFile("deploy/sql/海外区域统一增量-MySQL8.sql");
        String normalized = normalize(overseas);

        assertThat(createStatement(overseas, "ll_outbound_order")).contains(
            "customer_id", "outbound_type", "lx_codes", "request_hash");
        assertThat(createStatement(overseas, "ll_outbound_pallet_item")).contains("picked_package_count");
        assertThat(createStatement(overseas, "ll_delivery_order")).contains(
            "customer_id", "overseas_warehouse_name", "waybill_no", "signed_packages");
        assertThat(normalized).contains("check(signed_packagesisnullor(signed_packages>=0andsigned_packages<=package_count))");
        assertThat(createStatement(overseas, "ll_dropship_order_profile")).contains(
            "source_pallet_no", "manifest_version", "manifest_package_count",
            "manifest_fragment_count", "manifest_hash");
        assertThat(normalized).contains(
            "keyidx_ll_dropship_profile_manifest(source_pallet_no,manifest_hash)",
            "uniquekeyuk_ll_dropship_sku_inventory(profile_id,sku_code)");
        assertThat(createStatement(overseas, "ll_relabel_item")).contains(
            "destination_fba_warehouse_code", "source_inventory_balance_id",
            "source_inventory_position_id", "source_inbound_order_id");
        assertThat(overseas).doesNotContain("\nUPDATE ", "\nDELETE ", "ALTER TABLE ll_");
    }

    @Test
    void transferFinalMeasurementColumnsAreCreatedBeforeAnyBusinessWrite() throws Exception {
        for (String path : List.of("lastleg-service/src/main/resources/db/lastleg.sql",
            "deploy/sql/海外区域统一增量-MySQL8.sql")) {
            String sql = repositoryFile(path);
            String carton = createStatement(sql, "ll_warehouse_transfer_carton");
            for (String column : List.of("customer_carton_mark", "length_cm", "width_cm", "height_cm",
                "gross_weight_kg", "counted_quantity", "count_idempotency_key", "count_request_hash",
                "counted_by", "counted_at", "discrepancy_reason", "transfer_pallet_id", "sku_items_json")) {
                assertThat(carton).as(path + ":" + column).contains(column);
            }
            assertThat(createStatement(sql, "ll_warehouse_transfer_item")).contains("declared_quantity");
            assertThat(createStatement(sql, "ll_cargo_discard_item")).contains("idx_ll_cargo_discard_return_carton");
        }
    }

    @Test
    void overseasFixedEntryAndModuleBaselineBothDefineCompletePhase5Tables() throws Exception {
        String baseline = repositoryFile("lastleg-service/src/main/resources/db/lastleg.sql");
        String overseas = repositoryFile("deploy/sql/海外区域统一增量-MySQL8.sql");

        for (String table : PHASE5_TABLES) {
            assertThat(createStatement(overseas, table)).as(table)
                .contains("PRIMARY KEY", "COMMENT='");
            assertThat(createStatement(baseline, table)).as(table)
                .contains("PRIMARY KEY", "COMMENT='");
        }
    }

    @Test
    void unifiedSessionDoesNotInitializeASecondAuthorizationProjection() throws Exception {
        String overseas = repositoryFile("deploy/sql/海外区域统一增量-MySQL8.sql");
        assertThat(overseas).doesNotContain("CREATE TABLE ll_security_projection", "CREATE TABLE ll_security_event_inbox",
            "baseline-platform-admin-authorization-v0", "@platform_admin_overseas_authorities");
        String primary = repositoryFile("deploy/sql/头程数据库统一增量-MySQL8.sql");
        assertThat(primary).contains("CREATE TABLE iam_security_subject_version", "CREATE TABLE iam_security_tenant_version");
    }

    @Test
    void overseasReturnOrdersUseTheFinalCleanSchemaWithoutLegacyBackfill() throws Exception {
        String overseas = repositoryFile("deploy/sql/海外区域统一增量-MySQL8.sql");

        assertThat(overseas).contains("CREATE TABLE ll_return_order (", "CREATE TABLE ll_return_order_item (")
            .doesNotContain("o.source_order_id COLLATE", "o.source_order_no COLLATE");
    }

    @Test
    void domesticFixedEntryKeepsIamPermissionsButOwnsNoLastlegBusinessSchema() throws Exception {
        String domestic = repositoryFile("deploy/sql/头程数据库统一增量-MySQL8.sql");

        assertThat(domestic).contains(
            "platform:overseas-warehouse:dispatch:list",
            "platform:overseas-warehouse:exception-order:list",
            "platform:overseas-warehouse:customer-visit:list");
        assertThat(domestic).doesNotContain(
            "USE baiyue_lastleg",
            "CREATE DATABASE IF NOT EXISTS baiyue_lastleg",
            "CREATE TABLE IF NOT EXISTS ll_",
            "ALTER TABLE ll_");
    }

    private static String createStatement(String sql, String table) {
        String token = "CREATE TABLE IF NOT EXISTS " + table + " (";
        int start = sql.indexOf(token);
        if (start < 0) {
            token = "CREATE TABLE " + table + " (";
            start = sql.indexOf(token);
        }
        int end = sql.indexOf(';', start);
        assertThat(start).as(table).isGreaterThanOrEqualTo(0);
        assertThat(end).as(table).isGreaterThan(start);
        return sql.substring(start, end + 1);
    }

    private static String normalize(String sql) {
        return sql.toLowerCase(Locale.ROOT).replaceAll("\\s+", "");
    }

    private static int count(String source, String token) {
        return source.split(java.util.regex.Pattern.quote(token), -1).length - 1;
    }

    private static String repositoryFile(String relative) throws Exception {
        Path path = Path.of(relative);
        if (!Files.exists(path)) path = Path.of("..").resolve(relative);
        return Files.readString(path, StandardCharsets.UTF_8);
    }
}