-- MS SQL Server Table Creation for Weather Connect
-- Run this as weather_user or a user with CREATE TABLE privileges
-- This creates the same schema structure as the Oracle implementation

USE WeatherDB;
GO

-- 1. Create weather_data table (main table)
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'dbo.weather_data') AND type = 'U')
BEGIN
    CREATE TABLE dbo.weather_data (
        id BIGINT IDENTITY(1,1) PRIMARY KEY,
        timestamp DATETIME2(6) NOT NULL,
        topic NVARCHAR(255) NOT NULL,
        location NVARCHAR(100),
        temperature DECIMAL(5,2),
        humidity DECIMAL(5,2),
        pressure DECIMAL(7,2),
        wind_speed DECIMAL(5,2),
        wind_direction DECIMAL(5,2),
        rainfall DECIMAL(6,2),
        created_at DATETIME2(6) DEFAULT GETDATE()
    );
    PRINT 'Table weather_data created successfully.';
END
ELSE
BEGIN
    PRINT 'Table weather_data already exists.';
END
GO

-- 2. Create raw_data table (stores raw JSON data)
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'dbo.raw_data') AND type = 'U')
BEGIN
    CREATE TABLE dbo.raw_data (
        weather_data_id BIGINT PRIMARY KEY,
        raw_data NVARCHAR(MAX),
        CONSTRAINT fk_raw_data_weather_data 
            FOREIGN KEY (weather_data_id) 
            REFERENCES dbo.weather_data (id) 
            ON DELETE CASCADE,
        CONSTRAINT chk_raw_data_json 
            CHECK (ISJSON(raw_data) = 1)
    );
    PRINT 'Table raw_data created successfully.';
END
ELSE
BEGIN
    PRINT 'Table raw_data already exists.';
END
GO

-- 3. Create index on timestamp and topic for better query performance
IF NOT EXISTS (SELECT * FROM sys.indexes WHERE name = 'idx_weather_data_ts_topic')
BEGIN
    CREATE INDEX idx_weather_data_ts_topic 
    ON dbo.weather_data (timestamp, topic);
    PRINT 'Index idx_weather_data_ts_topic created successfully.';
END
ELSE
BEGIN
    PRINT 'Index idx_weather_data_ts_topic already exists.';
END
GO

-- 4. Verify table creation
SELECT 
    t.name AS TableName,
    c.name AS ColumnName,
    ty.name AS DataType,
    c.max_length AS MaxLength,
    c.precision AS Precision,
    c.scale AS Scale,
    c.is_nullable AS IsNullable,
    c.is_identity AS IsIdentity
FROM sys.tables t
INNER JOIN sys.columns c ON t.object_id = c.object_id
INNER JOIN sys.types ty ON c.user_type_id = ty.user_type_id
WHERE t.name IN ('weather_data', 'raw_data')
ORDER BY t.name, c.column_id;
GO

-- 5. Display constraints
SELECT 
    fk.name AS ConstraintName,
    OBJECT_NAME(fk.parent_object_id) AS TableName,
    COL_NAME(fc.parent_object_id, fc.parent_column_id) AS ColumnName,
    OBJECT_NAME(fk.referenced_object_id) AS ReferencedTable,
    COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS ReferencedColumn
FROM sys.foreign_keys AS fk
INNER JOIN sys.foreign_key_columns AS fc 
    ON fk.object_id = fc.constraint_object_id
WHERE fk.name = 'fk_raw_data_weather_data';
GO

-- 6. Display indexes
SELECT 
    i.name AS IndexName,
    t.name AS TableName,
    i.type_desc AS IndexType,
    COL_NAME(ic.object_id, ic.column_id) AS ColumnName
FROM sys.indexes i
INNER JOIN sys.index_columns ic ON i.object_id = ic.object_id AND i.index_id = ic.index_id
INNER JOIN sys.tables t ON i.object_id = t.object_id
WHERE t.name = 'weather_data' AND i.name = 'idx_weather_data_ts_topic'
ORDER BY ic.key_ordinal;
GO

PRINT 'Tables created successfully and ready for use.';
PRINT 'Schema matches Oracle implementation with two-table structure:';
PRINT '  - weather_data: Main weather metrics table';
PRINT '  - raw_data: Raw JSON data table with foreign key relationship';
GO