-- Migration: Make CURRENT baseline global (not session-specific)
-- Run this ONCE to update existing database

BEGIN TRANSACTION;

-- Step 1: Create new global CURRENT table
CREATE TABLE IF NOT EXISTS BaselineInventory_Current_New (
    current_id INTEGER PRIMARY KEY AUTOINCREMENT,
    lot_number TEXT NOT NULL,
    item TEXT NOT NULL,
    description TEXT,
    system_location TEXT,
    system_bin TEXT NOT NULL,
    system_quantity REAL NOT NULL,
    upload_timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(lot_number, system_bin)
);

-- Step 2: Copy latest CURRENT data (if any exists)
-- Get the most recent baseline_version
INSERT OR IGNORE INTO BaselineInventory_Current_New 
    (lot_number, item, description, system_location, system_bin, system_quantity, upload_timestamp)
SELECT 
    lot_number, 
    item, 
    description, 
    system_location, 
    system_bin, 
    system_quantity,
    upload_timestamp
FROM BaselineInventory_Current
WHERE is_deleted = 0
    AND baseline_version = (SELECT MAX(baseline_version) FROM BaselineInventory_Current WHERE is_deleted = 0)
ORDER BY upload_timestamp DESC;

-- Step 3: Drop old CURRENT table
DROP TABLE IF EXISTS BaselineInventory_Current;

-- Step 4: Rename new table
ALTER TABLE BaselineInventory_Current_New RENAME TO BaselineInventory_Current;

-- Step 5: Remove CURRENT columns from ScanEntries
-- SQLite doesn't support DROP COLUMN directly, so we recreate the table
CREATE TABLE ScanEntries_New (
    entry_id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id INTEGER NOT NULL,
    location_count_id INTEGER NOT NULL,
    lot_number TEXT NOT NULL,
    item TEXT,
    description TEXT,
    scanned_location TEXT NOT NULL,
    actual_weight REAL NOT NULL,
    scanned_by INTEGER NOT NULL,
    scan_timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
    
    -- MASTER baseline reference (stored for performance)
    master_status TEXT,
    master_expected_location TEXT,
    master_expected_weight REAL,
    master_variance_lbs REAL,
    master_variance_pct REAL,
    
    -- Duplicate tracking
    duplicate_status TEXT DEFAULT '00',
    duplicate_info TEXT,
    
    -- Metadata
    comment TEXT,
    is_deleted INTEGER DEFAULT 0,
    deleted_by INTEGER,
    deleted_timestamp DATETIME,
    modified_timestamp DATETIME,
    
    FOREIGN KEY (session_id) REFERENCES CountSessions(session_id),
    FOREIGN KEY (location_count_id) REFERENCES LocationCounts(location_count_id),
    FOREIGN KEY (scanned_by) REFERENCES Users(user_id),
    FOREIGN KEY (deleted_by) REFERENCES Users(user_id)
);

-- Copy all scan data
INSERT INTO ScanEntries_New 
SELECT 
    entry_id,
    session_id,
    location_count_id,
    lot_number,
    item,
    description,
    scanned_location,
    actual_weight,
    scanned_by,
    scan_timestamp,
    master_status,
    master_expected_location,
    master_expected_weight,
    master_variance_lbs,
    master_variance_pct,
    duplicate_status,
    duplicate_info,
    comment,
    is_deleted,
    deleted_by,
    deleted_timestamp,
    modified_timestamp
FROM ScanEntries;

-- Drop old table and rename
DROP TABLE ScanEntries;
ALTER TABLE ScanEntries_New RENAME TO ScanEntries;

-- Recreate indexes
CREATE INDEX idx_scanentries_session ON ScanEntries(session_id);
CREATE INDEX idx_scanentries_location ON ScanEntries(location_count_id);
CREATE INDEX idx_scanentries_lot ON ScanEntries(lot_number);
CREATE INDEX idx_scanentries_deleted ON ScanEntries(is_deleted);

-- Step 6: Remove current_baseline_version from CountSessions
-- Recreate CountSessions table
CREATE TABLE CountSessions_New (
    session_id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_name TEXT NOT NULL,
    description TEXT,
    status TEXT DEFAULT 'active',
    branch TEXT DEFAULT 'Main',
    created_by INTEGER NOT NULL,
    created_timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
    master_baseline_timestamp DATETIME,
    current_baseline_timestamp DATETIME,
    completed_timestamp DATETIME,
    FOREIGN KEY (created_by) REFERENCES Users(user_id)
);

-- Copy session data
INSERT INTO CountSessions_New
SELECT 
    session_id,
    session_name,
    description,
    status,
    branch,
    created_by,
    created_timestamp,
    master_baseline_timestamp,
    current_baseline_timestamp,
    completed_timestamp
FROM CountSessions;

-- Drop old and rename
DROP TABLE CountSessions;
ALTER TABLE CountSessions_New RENAME TO CountSessions;

COMMIT;

-- Migration complete!
-- CURRENT baseline is now global and always shows latest data