/*
    陕化建施工管理系统历史模块清理脚本
    目标库：SGGLDB_SHJ

    删除范围：
      1. PHTGL（项目合同/投标管理）专属表
      2. ZHGL（综合管理）专属表

    明确保留：
      1. HTGL 人员 API 对应代码不属于本脚本处理范围
      2. WBS 表
      3. 焊接共用施工日志表：
         ZHGL_ConstructionLog
         ZHGL_ConstructionLogMachine
         ZHGL_ConstructionLogPerson
         ZHGL_ConstructionLogWorkEfficiency

    说明：
      - 数据库已由用户提前备份，本脚本不再执行备份。
      - 脚本会先删除所有涉及待删表的外键，再删除待删表。
      - 脚本可重复执行；已经不存在的目标表会跳过。
      - 数据库中未发现独立 JDGL_* 业务表；JDGL 进度数据使用 WBS 表，因此不删除 WBS。
      - PHTGL、JDGL、PZHGL 菜单及权限由已确认的 CQMS 清理脚本按菜单类型清理；本脚本只处理业务表。
      - 本脚本不删除历史日志表。
*/

USE [SGGLDB_SHJ];
GO

SET NOCOUNT ON;
SET XACT_ABORT ON;

IF DB_NAME() <> N'SGGLDB_SHJ'
BEGIN
    RAISERROR(N'当前数据库不是 SGGLDB_SHJ，已停止执行。', 16, 1);
    RETURN;
END;

DECLARE @DropTables TABLE
(
    TableName sysname NOT NULL PRIMARY KEY
);

INSERT INTO @DropTables (TableName)
VALUES
    (N'PHTGL_ActionPlanFormation'),
    (N'PHTGL_ActionPlanFormation_Sch1'),
    (N'PHTGL_ActionPlanReview'),
    (N'PHTGL_Approve'),
    (N'PHTGL_Approve_TEST'),
    (N'PHTGL_AttachUrl'),
    (N'PHTGL_AttachUrl1'),
    (N'PHTGL_AttachUrl10'),
    (N'PHTGL_AttachUrl10_HumanInput'),
    (N'PHTGL_AttachUrl10_MachineInput'),
    (N'PHTGL_AttachUrl11'),
    (N'PHTGL_AttachUrl12'),
    (N'PHTGL_AttachUrl13'),
    (N'PHTGL_AttachUrl14'),
    (N'PHTGL_AttachUrl15_Sch1'),
    (N'PHTGL_AttachUrl15_Sch2'),
    (N'PHTGL_AttachUrl15_Sch3'),
    (N'PHTGL_AttachUrl15_Sch4'),
    (N'PHTGL_AttachUrl18'),
    (N'PHTGL_AttachUrl19'),
    (N'PHTGL_AttachUrl2'),
    (N'PHTGL_AttachUrl20'),
    (N'PHTGL_AttachUrl2Detail'),
    (N'PHTGL_AttachUrl3'),
    (N'PHTGL_AttachUrl4'),
    (N'PHTGL_AttachUrl5'),
    (N'PHTGL_AttachUrl5_DevicePrice'),
    (N'PHTGL_AttachUrl5_MaterialsPrice'),
    (N'PHTGL_AttachUrl6'),
    (N'PHTGL_AttachUrl7'),
    (N'PHTGL_AttachUrl8'),
    (N'PHTGL_AttachUrl9_SubPerson'),
    (N'PHTGL_AttachUrl9_SubStaffing'),
    (N'PHTGL_BidApproveUserReview'),
    (N'PHTGL_BidApproveUserReview_Sch1'),
    (N'PHTGL_BidDocumentsReview'),
    (N'PHTGL_BidDocumentsStandingBook'),
    (N'PHTGL_BidProjectQuantity'),
    (N'PHTGL_Contract'),
    (N'PHTGL_ContractReview'),
    (N'PHTGL_ContractStandingBook'),
    (N'PHTGL_ContractTrack'),
    (N'PHTGL_ContractTrackMatchWBS'),
    (N'PHTGL_ContractTrackProgress'),
    (N'PHTGL_Invoice'),
    (N'PHTGL_InvoiceDetail'),
    (N'PHTGL_MainProjectQuantity'),
    (N'PHTGL_Quantity'),
    (N'PHTGL_SetSubReview'),
    (N'PHTGL_SetSubReview_Sch1'),
    (N'PHTGL_SetSubReview_Sch2'),
    (N'PHTGL_SpecialTermsConditions'),
    (N'PHTGL_SubcontractAgreement'),
    (N'ZHGL_ConstructionLogHJGL'),
    (N'ZHGL_ConstructionLogManagement'),
    (N'ZHGL_ConstructionLogProblem'),
    (N'ZHGL_ConstructionLogRecord'),
    (N'ZHGL_ConstructionLogWorkEfficiencyCompany'),
    (N'ZHGL_ConstructionLogWorkEfficiencyMonth'),
    (N'ZHGL_ConstructionLogWorkEfficiencyProject'),
    (N'ZHGL_ConstructionMonthReport'),
    (N'ZHGL_ConstructionMonthReportMainCost'),
    (N'ZHGL_ConstructionMonthReportSubCost'),
    (N'ZHGL_ConstructionPlan'),
    (N'ZHGL_ConstructionPlanApprove'),
    (N'ZHGL_ConstructionReport'),
    (N'ZHGL_ConstructionReportApprove'),
    (N'ZHGL_ProjectConstructionLog'),
    (N'ZHGL_WorkHandover'),
    (N'ZHGL_WorkHandoverApprove'),
    (N'ZHGL_WorkHandoverDetail');

DECLARE @KeepTables TABLE
(
    TableName sysname NOT NULL PRIMARY KEY
);

INSERT INTO @KeepTables (TableName)
VALUES
    (N'ZHGL_ConstructionLog'),
    (N'ZHGL_ConstructionLogMachine'),
    (N'ZHGL_ConstructionLogPerson'),
    (N'ZHGL_ConstructionLogWorkEfficiency'),
    (N'WBS_ControlItemInit'),
    (N'WBS_ControlItemProject'),
    (N'WBS_UnitWork'),
    (N'WBS_WorkPackageInit'),
    (N'WBS_WorkPackageProject');

IF EXISTS
(
    SELECT 1
    FROM @KeepTables k
    LEFT JOIN sys.tables t
      ON t.schema_id = SCHEMA_ID(N'dbo')
     AND t.name = k.TableName
    WHERE t.object_id IS NULL
)
BEGIN
    SELECT k.TableName AS MissingKeepTable
    FROM @KeepTables k
    LEFT JOIN sys.tables t
      ON t.schema_id = SCHEMA_ID(N'dbo')
     AND t.name = k.TableName
    WHERE t.object_id IS NULL;

    RAISERROR(N'存在需要保留但当前数据库中不存在的表，已停止执行。', 16, 1);
    RETURN;
END;

SELECT
    d.TableName,
    CASE WHEN t.object_id IS NULL THEN N'不存在/已清理' ELSE N'待删除' END AS CleanupStatus
FROM @DropTables d
LEFT JOIN sys.tables t
  ON t.schema_id = SCHEMA_ID(N'dbo')
 AND t.name = d.TableName
ORDER BY d.TableName;

BEGIN TRY
    BEGIN TRANSACTION;

    DECLARE @Sql nvarchar(max) = N'';

    /* 删除所有与目标表有关的外键，包括保留焊接表指向目标表的外键。 */
    SELECT @Sql = @Sql
        + N'ALTER TABLE ' + QUOTENAME(OBJECT_SCHEMA_NAME(fk.parent_object_id))
        + N'.' + QUOTENAME(OBJECT_NAME(fk.parent_object_id))
        + N' DROP CONSTRAINT ' + QUOTENAME(fk.name) + N';' + CHAR(13) + CHAR(10)
    FROM sys.foreign_keys fk
    WHERE EXISTS
    (
        SELECT 1
        FROM @DropTables d
        JOIN sys.tables t
          ON t.schema_id = SCHEMA_ID(N'dbo')
         AND t.name = d.TableName
        WHERE t.object_id = fk.parent_object_id
           OR t.object_id = fk.referenced_object_id
    );

    IF @Sql <> N''
        EXEC sys.sp_executesql @Sql;

    SET @Sql = N'';

    SELECT @Sql = @Sql
        + N'DROP TABLE ' + QUOTENAME(N'dbo') + N'.' + QUOTENAME(t.name) + N';'
        + CHAR(13) + CHAR(10)
    FROM @DropTables d
    JOIN sys.tables t
      ON t.schema_id = SCHEMA_ID(N'dbo')
     AND t.name = d.TableName;

    IF @Sql <> N''
        EXEC sys.sp_executesql @Sql;

    COMMIT TRANSACTION;
END TRY
BEGIN CATCH
    IF XACT_STATE() <> 0
        ROLLBACK TRANSACTION;
    THROW;
END CATCH;

/* 执行后核验：目标表为 0，保留表仍存在。 */
SELECT N'RemainingTargetTables' AS Metric, COUNT(*) AS Value
FROM sys.tables t
JOIN @DropTables d ON d.TableName = t.name
WHERE t.schema_id = SCHEMA_ID(N'dbo');

SELECT N'RetainedWeldingTables' AS Metric, COUNT(*) AS Value
FROM sys.tables t
JOIN @KeepTables k ON k.TableName = t.name
WHERE t.schema_id = SCHEMA_ID(N'dbo')
  AND k.TableName LIKE N'ZHGL[_]%';

SELECT N'WBS_ControlItemInit' AS Metric, COUNT_BIG(*) AS Value FROM dbo.WBS_ControlItemInit
UNION ALL SELECT N'WBS_ControlItemProject', COUNT_BIG(*) FROM dbo.WBS_ControlItemProject
UNION ALL SELECT N'WBS_UnitWork', COUNT_BIG(*) FROM dbo.WBS_UnitWork
UNION ALL SELECT N'WBS_WorkPackageInit', COUNT_BIG(*) FROM dbo.WBS_WorkPackageInit
UNION ALL SELECT N'WBS_WorkPackageProject', COUNT_BIG(*) FROM dbo.WBS_WorkPackageProject;

SELECT
    fk.name AS ForeignKeyName,
    OBJECT_SCHEMA_NAME(fk.parent_object_id) AS ParentSchema,
    OBJECT_NAME(fk.parent_object_id) AS ParentTable,
    OBJECT_SCHEMA_NAME(fk.referenced_object_id) AS ReferencedSchema,
    OBJECT_NAME(fk.referenced_object_id) AS ReferencedTable
FROM sys.foreign_keys fk
WHERE fk.parent_object_id IN
(
    SELECT t.object_id
    FROM sys.tables t
    JOIN @KeepTables k ON k.TableName = t.name
    WHERE t.schema_id = SCHEMA_ID(N'dbo')
      AND k.TableName LIKE N'ZHGL[_]%'
)
ORDER BY ParentTable, ForeignKeyName;