-- Drop tables in reverse order of dependency
DROP TABLE IF EXISTS public.product_metrics CASCADE;
DROP TABLE IF EXISTS public.daily_product_snapshots CASCADE;

-- Table Definition: daily_product_snapshots
CREATE TABLE public.daily_product_snapshots (
    snapshot_date DATE NOT NULL,
    pid INT8 NOT NULL,
    sku VARCHAR, -- Copied for convenience

    -- Inventory Metrics (End of Day / Last Snapshot of Day)
    eod_stock_quantity INT NOT NULL DEFAULT 0,
    eod_stock_cost NUMERIC(14, 4) NOT NULL DEFAULT 0.00, -- Increased precision
    eod_stock_retail NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    eod_stock_gross NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    stockout_flag BOOLEAN NOT NULL DEFAULT FALSE,

    -- Sales Metrics (Aggregated for the snapshot_date)
    units_sold INT NOT NULL DEFAULT 0,
    units_returned INT NOT NULL DEFAULT 0,
    gross_revenue NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    discounts NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    returns_revenue NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    net_revenue NUMERIC(14, 4) NOT NULL DEFAULT 0.00, -- gross_revenue - discounts
    cogs NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    gross_regular_revenue NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    profit NUMERIC(14, 4) NOT NULL DEFAULT 0.00, -- net_revenue - cogs

    -- Receiving Metrics (Aggregated for the snapshot_date)
    units_received INT NOT NULL DEFAULT 0,
    cost_received NUMERIC(14, 4) NOT NULL DEFAULT 0.00,

    calculation_timestamp TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,

    PRIMARY KEY (snapshot_date, pid) -- Composite primary key
    -- CONSTRAINT fk_daily_snapshot_pid FOREIGN KEY (pid) REFERENCES public.products(pid) ON DELETE CASCADE ON UPDATE CASCADE -- FK Optional on snapshot table
);

-- Add Indexes for daily_product_snapshots
CREATE INDEX idx_daily_snapshot_pid_date ON public.daily_product_snapshots(pid, snapshot_date); -- Useful for product-specific time series


-- Table Definition: product_metrics
CREATE TABLE public.product_metrics (
    pid INT8 PRIMARY KEY,
    last_calculated TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,

    -- Product Info (Copied for convenience/performance)
    sku VARCHAR,
    title VARCHAR,
    brand VARCHAR,
    vendor VARCHAR,
    image_url VARCHAR, -- (e.g., products.image_175)
    is_visible BOOLEAN,
    is_replenishable BOOLEAN,

    -- Current Status (Refreshed Hourly)
    current_price NUMERIC(10, 2),
    current_regular_price NUMERIC(10, 2),
    current_cost_price NUMERIC(10, 4), -- Increased precision for cost
    current_landing_cost_price NUMERIC(10, 4), -- Increased precision for cost
    current_stock INT NOT NULL DEFAULT 0,
    current_stock_cost NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    current_stock_retail NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    current_stock_gross NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    on_order_qty INT NOT NULL DEFAULT 0,
    on_order_cost NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    on_order_retail NUMERIC(14, 4) NOT NULL DEFAULT 0.00,
    earliest_expected_date DATE,
    -- total_received_lifetime INT NOT NULL DEFAULT 0, -- Can calc if needed

    -- Historical Dates (Calculated Once/Periodically)
    date_created DATE,
    date_first_received DATE,
    date_last_received DATE,
    date_first_sold DATE,
    date_last_sold DATE,
    age_days INT, -- Calculated based on LEAST(date_created, date_first_sold)

    -- Rolling Period Metrics (Refreshed Hourly from daily_product_snapshots)
    sales_7d INT, revenue_7d NUMERIC(14, 4),
    sales_14d INT, revenue_14d NUMERIC(14, 4),
    sales_30d INT, revenue_30d NUMERIC(14, 4),
    cogs_30d NUMERIC(14, 4), profit_30d NUMERIC(14, 4),
    returns_units_30d INT, returns_revenue_30d NUMERIC(14, 4),
    discounts_30d NUMERIC(14, 4),
    gross_revenue_30d NUMERIC(14, 4), gross_regular_revenue_30d NUMERIC(14, 4),
    stockout_days_30d INT,
    sales_365d INT, revenue_365d NUMERIC(14, 4),
    avg_stock_units_30d NUMERIC(10, 2), avg_stock_cost_30d NUMERIC(14, 4),
    avg_stock_retail_30d NUMERIC(14, 4), avg_stock_gross_30d NUMERIC(14, 4),
    received_qty_30d INT, received_cost_30d NUMERIC(14, 4),

    -- Lifetime Metrics (Recalculated Hourly/Daily from daily_product_snapshots)
    lifetime_sales INT,
    lifetime_revenue NUMERIC(16, 4),

    -- First Period Metrics (Calculated Once/Periodically from daily_product_snapshots)
    first_7_days_sales INT, first_7_days_revenue NUMERIC(14, 4),
    first_30_days_sales INT, first_30_days_revenue NUMERIC(14, 4),
    first_60_days_sales INT, first_60_days_revenue NUMERIC(14, 4),
    first_90_days_sales INT, first_90_days_revenue NUMERIC(14, 4),

    -- Calculated KPIs (Refreshed Hourly based on rolling metrics)
    asp_30d NUMERIC(10, 2), -- revenue_30d / sales_30d
    acp_30d NUMERIC(10, 4), -- cogs_30d / sales_30d
    avg_ros_30d NUMERIC(10, 4), -- profit_30d / sales_30d
    avg_sales_per_day_30d NUMERIC(10, 2), -- sales_30d / 30.0
    avg_sales_per_month_30d NUMERIC(10, 2), -- sales_30d (assuming 30d = 1 month for this metric)
    margin_30d NUMERIC(8, 2), -- (profit_30d / revenue_30d) * 100
    markup_30d NUMERIC(8, 2), -- (profit_30d / cogs_30d) * 100
    gmroi_30d NUMERIC(10, 2), -- profit_30d / avg_stock_cost_30d
    stockturn_30d NUMERIC(10, 2), -- sales_30d / avg_stock_units_30d
    return_rate_30d NUMERIC(8, 2), -- returns_units_30d / (sales_30d + returns_units_30d) * 100
    discount_rate_30d NUMERIC(8, 2), -- discounts_30d / gross_revenue_30d * 100
    stockout_rate_30d NUMERIC(8, 2), -- stockout_days_30d / 30.0 * 100
    markdown_30d NUMERIC(14, 4), -- gross_regular_revenue_30d - gross_revenue_30d
    markdown_rate_30d NUMERIC(8, 2), -- markdown_30d / gross_regular_revenue_30d * 100
    sell_through_30d NUMERIC(8, 2), -- sales_30d / (current_stock + sales_30d) * 100
    avg_lead_time_days INT, -- Calculated Periodically from purchase_orders

    -- Forecasting & Replenishment (Refreshed Hourly)
    abc_class CHAR(1), -- Updated Periodically (e.g., Weekly)
    sales_velocity_daily NUMERIC(10, 4), -- sales_30d / (30.0 - stockout_days_30d)
    config_lead_time INT, -- From settings tables
    config_days_of_stock INT, -- From settings tables
    config_safety_stock INT, -- From settings_product
    planning_period_days INT, -- config_lead_time + config_days_of_stock
    lead_time_forecast_units NUMERIC(10, 2), -- sales_velocity_daily * config_lead_time
    days_of_stock_forecast_units NUMERIC(10, 2), -- sales_velocity_daily * config_days_of_stock
    planning_period_forecast_units NUMERIC(10, 2), -- lead_time_forecast_units + days_of_stock_forecast_units
    lead_time_closing_stock NUMERIC(10, 2), -- current_stock + on_order_qty - lead_time_forecast_units
    days_of_stock_closing_stock NUMERIC(10, 2), -- lead_time_closing_stock - days_of_stock_forecast_units
    replenishment_needed_raw NUMERIC(10, 2), -- planning_period_forecast_units + config_safety_stock - current_stock - on_order_qty
    replenishment_units INT, -- CEILING(GREATEST(0, replenishment_needed_raw))
    replenishment_cost NUMERIC(14, 4), -- replenishment_units * COALESCE(current_landing_cost_price, current_cost_price)
    replenishment_retail NUMERIC(14, 4), -- replenishment_units * current_price
    replenishment_profit NUMERIC(14, 4), -- replenishment_units * (current_price - COALESCE(current_landing_cost_price, current_cost_price))
    to_order_units INT, -- Apply MOQ/UOM logic to replenishment_units
    forecast_lost_sales_units NUMERIC(10, 2), -- GREATEST(0, -lead_time_closing_stock)
    forecast_lost_revenue NUMERIC(14, 4), -- forecast_lost_sales_units * current_price
    stock_cover_in_days NUMERIC(10, 1), -- current_stock / sales_velocity_daily
    po_cover_in_days NUMERIC(10, 1), -- on_order_qty / sales_velocity_daily
    sells_out_in_days NUMERIC(10, 1), -- (current_stock + on_order_qty) / sales_velocity_daily
    replenish_date DATE, -- Calc based on when stock hits safety stock minus lead time
    overstocked_units INT, -- GREATEST(0, current_stock - config_safety_stock - planning_period_forecast_units)
    overstocked_cost NUMERIC(14, 4), -- overstocked_units * COALESCE(current_landing_cost_price, current_cost_price)
    overstocked_retail NUMERIC(14, 4), -- overstocked_units * current_price
    is_old_stock BOOLEAN, -- Based on age, last sold, last received, on_order status

    -- Yesterday's Metrics (Refreshed Hourly from daily_product_snapshots)
    yesterday_sales INT,

    CONSTRAINT fk_product_metrics_pid FOREIGN KEY (pid) REFERENCES public.products(pid) ON DELETE CASCADE ON UPDATE CASCADE
);

-- Add Indexes for product_metrics (adjust based on common filtering/sorting in frontend)
CREATE INDEX idx_product_metrics_brand ON public.product_metrics(brand);
CREATE INDEX idx_product_metrics_vendor ON public.product_metrics(vendor);
CREATE INDEX idx_product_metrics_sku ON public.product_metrics(sku);
CREATE INDEX idx_product_metrics_abc_class ON public.product_metrics(abc_class);
CREATE INDEX idx_product_metrics_revenue_30d ON public.product_metrics(revenue_30d DESC NULLS LAST); -- Example sorting index
CREATE INDEX idx_product_metrics_sales_30d ON public.product_metrics(sales_30d DESC NULLS LAST); -- Example sorting index
CREATE INDEX idx_product_metrics_current_stock ON public.product_metrics(current_stock);
CREATE INDEX idx_product_metrics_sells_out_in_days ON public.product_metrics(sells_out_in_days ASC NULLS LAST); -- Example sorting index