# -*- coding: utf-8 -*-
"""Pre-migration for Express Orders (19.0.22.0.0).

Runs BEFORE Odoo's field-registration pass on `-u fusion_plating_configurator`,
so the model can register `terms_and_conditions` and `pricelist_id` against
columns that already hold data.

Actions:
  1. Rename `fp_direct_order_wizard.notes` → `terms_and_conditions`.
     Existing data preserves its semantic (always was customer-facing because
     the old `action_create_order` wrote it to sale.order.note).
  2. Add the new Express columns (idempotent — IF NOT EXISTS guards).
  3. Backfill `pricelist_id` from the legacy `currency_id` via any active
     pricelist matching the currency. After this, the model's stored-related
     currency_id (related='pricelist_id.currency_id') takes over.
  4. (No currency_id column drop here — Odoo's schema sync recognises the
     related field and keeps the column shape; data refreshes from the
     related lookup on subsequent writes.)

Dev-stage caveat: per the Express Orders design spec section 12, we are
ignoring past orders. If `currency_id` data on legacy rows doesn't line up
with the new pricelist_id-driven flow, that's acceptable.
"""


def migrate(cr, version):
    # 1. Rename notes → terms_and_conditions (same column, same data)
    cr.execute("""
        SELECT 1 FROM information_schema.columns
         WHERE table_name = 'fp_direct_order_wizard'
           AND column_name = 'notes'
    """)
    if cr.fetchone():
        cr.execute("""
            ALTER TABLE fp_direct_order_wizard
            RENAME COLUMN notes TO terms_and_conditions
        """)

    # 2. Add new Express columns (idempotent)
    cr.execute("""
        ALTER TABLE fp_direct_order_wizard
        ADD COLUMN IF NOT EXISTS internal_notes TEXT
    """)
    cr.execute("""
        ALTER TABLE fp_direct_order_wizard
        ADD COLUMN IF NOT EXISTS pricelist_id INTEGER
            REFERENCES product_pricelist(id) ON DELETE SET NULL
    """)
    cr.execute("""
        ALTER TABLE fp_direct_order_wizard
        ADD COLUMN IF NOT EXISTS material_process VARCHAR
    """)
    cr.execute("""
        ALTER TABLE fp_direct_order_wizard
        ADD COLUMN IF NOT EXISTS validity_date DATE
    """)
    cr.execute("""
        ALTER TABLE fp_direct_order_wizard
        ADD COLUMN IF NOT EXISTS view_source VARCHAR DEFAULT 'legacy'
    """)
    # Note: view_source defaults to 'legacy' for EXISTING rows — they were
    # created via the legacy view. New rows default to 'express' via the model.

    # 3. Backfill pricelist_id from any active pricelist matching the
    #    legacy currency_id (only if the currency_id column still exists).
    cr.execute("""
        SELECT 1 FROM information_schema.columns
         WHERE table_name = 'fp_direct_order_wizard'
           AND column_name = 'currency_id'
    """)
    if cr.fetchone():
        cr.execute("""
            UPDATE fp_direct_order_wizard w
            SET pricelist_id = (
                SELECT p.id
                FROM product_pricelist p
                WHERE p.currency_id = w.currency_id
                  AND p.active = TRUE
                ORDER BY p.id
                LIMIT 1
            )
            WHERE w.pricelist_id IS NULL
              AND w.currency_id IS NOT NULL
        """)