from odoo import models, api, _
from odoo.tools import float_compare
import logging

_logger = logging.getLogger(__name__)

class MrpProduction(models.Model):
    _inherit = 'mrp.production'

    @api.depends('state', 'product_qty', 'qty_producing', 'move_raw_ids.quantity', 'move_raw_ids.product_uom_qty')
    def _compute_show_produce(self):
        """
        Override to hide produce buttons if proceeding would cause negative stock.
        """
        # First compute standard visibility
        super()._compute_show_produce()

        for production in self:
            _logger.info("DEBUG MO_LOCK: MO %s state=%s qty_producing=%s product_qty=%s", production.name, production.state, production.qty_producing, production.product_qty)
            _logger.info("DEBUG MO_LOCK: Start - show_produce=%s show_produce_all=%s", production.show_produce, production.show_produce_all)
            
            # If standard logic says hidden, no need to check further
            if not production.show_produce and not production.show_produce_all:
                continue

            # Determine which action we are validating
            # If show_produce_all is True, we are producing the full remaining amount
            # If show_produce (partial) is True, we are producing 'qty_producing'
            
            # This logic needs to mirror what happens when the button is clicked.
            # However, for visibility, we want to know if *current* configured production is possible.
            
            # If "Produce All" is available, it means we plan to produce everything remaining.
            # If "Produce" (partial) is available, we plan to produce `qty_producing`.

            # Check if any component would go negative
            potential_negative = False
            
            # We need to check stock availability in the source location
            location = production.location_src_id
            
            for move in production.move_raw_ids:
                if move.state in ('done', 'cancel'):
                    continue
                
                # User request:
                # "if the components qty consumed is 0 then still show produce and produce all button"
                # "only hide the visibility if components qty consumed will make the stock negative"
                
                # If nothing is currently set to be consumed (0), we assume it's safe to proceed 
                # (or the user intends to consume 0/different amount later).
                # We only block if the *Explicitly Consumed* amount exceeds available stock.
                if move.quantity == 0:
                    continue

                # Check availability based on the ACTUAL 'Consumed' quantity
                qty_to_consume = move.quantity
                _logger.info("DEBUG MO_LOCK:   Move %s product=%s state=%s consumed=%s forecast=%s", move.id, move.product_id.display_name, move.state, qty_to_consume, move.forecast_availability)

                # Skip check if product is not storable (Service, etc.)
                if not move.product_id.is_storable:
                    continue

                # If the move is already assigned (Ready), we consider it safe to produce.
                if move.state == 'assigned':
                    _logger.info("DEBUG MO_LOCK:   Move is 'assigned', skipping negative check.")
                    continue

                # Check availability
                # We use forecast_availability as it includes reservations
                # Use float_compare to avoid precision issues
                if float_compare(move.forecast_availability, qty_to_consume, precision_rounding=move.product_uom.rounding) < 0:
                    _logger.info("DEBUG MO_LOCK:   CRITICAL - potential negative stock detected for %s", move.product_id.display_name)
                    potential_negative = True
                    break
            
            if potential_negative:
                production.show_produce = False
                production.show_produce_all = False

            _logger.info("DEBUG MO_LOCK: End - show_produce=%s show_produce_all=%s", production.show_produce, production.show_produce_all)

            # Relaxed guard: Do not hide if qty_producing > 0 even if consumption is 0.
            # This allows users to trigger consumption by clicking the Produce button.
            # If they really want to block 0-consumption production, it should be a validation error on click, 
            # not a hidden button that prevents them from even trying.