-- Migration 173: Supplier invoice flow metadata
-- Created: 2026-04-13

ALTER TABLE supplier_invoices
ADD COLUMN IF NOT EXISTS supplier_flow_type VARCHAR(20),
ADD COLUMN IF NOT EXISTS tags_json JSONB DEFAULT '[]'::jsonb,
ADD COLUMN IF NOT EXISTS source_email_id INTEGER REFERENCES email_messages(id) ON DELETE SET NULL,
ADD COLUMN IF NOT EXISTS linked_customer_id INTEGER REFERENCES customers(id) ON DELETE SET NULL,
ADD COLUMN IF NOT EXISTS linked_order_id BIGINT,
ADD COLUMN IF NOT EXISTS linked_order_source VARCHAR(50);

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1
        FROM pg_constraint
        WHERE conname = 'chk_supplier_invoices_supplier_flow_type'
    ) THEN
        ALTER TABLE supplier_invoices
        ADD CONSTRAINT chk_supplier_invoices_supplier_flow_type
        CHECK (
            supplier_flow_type IS NULL
            OR supplier_flow_type IN ('varekob', 'ydelse')
        );
    END IF;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1
        FROM pg_constraint
        WHERE conname = 'chk_supplier_invoices_linked_order_source'
    ) THEN
        ALTER TABLE supplier_invoices
        ADD CONSTRAINT chk_supplier_invoices_linked_order_source
        CHECK (
            linked_order_source IS NULL
            OR linked_order_source IN ('tmodule_orders', 'webshop_orders')
        );
    END IF;
END $$;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_supplier_flow_type
ON supplier_invoices(supplier_flow_type)
WHERE supplier_flow_type IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_source_email_id
ON supplier_invoices(source_email_id)
WHERE source_email_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_linked_customer_id
ON supplier_invoices(linked_customer_id)
WHERE linked_customer_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_linked_order_id
ON supplier_invoices(linked_order_id)
WHERE linked_order_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_tags_json
ON supplier_invoices USING GIN (tags_json);

COMMENT ON COLUMN supplier_invoices.supplier_flow_type IS 'Flow type: varekob or ydelse';
COMMENT ON COLUMN supplier_invoices.tags_json IS 'Tag list as JSON array';
COMMENT ON COLUMN supplier_invoices.source_email_id IS 'Source email message id';
COMMENT ON COLUMN supplier_invoices.linked_customer_id IS 'Linked customer context';
COMMENT ON COLUMN supplier_invoices.linked_order_id IS 'Linked order id';
COMMENT ON COLUMN supplier_invoices.linked_order_source IS 'Order table source: tmodule_orders or webshop_orders';