"""Additive resource configuration APIs; existing agreement/card APIs stay unchanged."""
from decimal import Decimal
from typing import Optional
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from psycopg2.extras import Json
from app.core.auth_dependencies import require_permission
from .service import transaction, json_safe, emit_event

router=APIRouter(prefix='/workflows/resources')
access=require_permission('workflows.manage')

class Coverage(BaseModel):
    tag_ids:list[int]=Field(default_factory=list)
    excluded_tag_ids:list[int]=Field(default_factory=list)
    include_descendants:bool=False

class ResourceUpdate(BaseModel):
    workflow_coverage:Coverage
    monthly_price:Optional[Decimal]=Field(default=None,ge=0,max_digits=12,decimal_places=2)

@router.get('')
def list_resources(customer_id:Optional[int]=None,user=Depends(access)):
    with transaction() as cursor:
        where=' WHERE customer_id=%s' if customer_id is not None else ''
        params=(customer_id,) if customer_id is not None else None
        cursor.execute('SELECT id,agreement_number,customer_id,status,workflow_coverage,monthly_price FROM customer_fixed_price_agreements'+where+' ORDER BY customer_id,id',params)
        agreements=cursor.fetchall()
        cursor.execute('SELECT id,card_number,customer_id,status,remaining_hours,workflow_coverage FROM tticket_prepaid_cards'+where+' ORDER BY customer_id,id',params)
        cards=cursor.fetchall()
        cursor.execute('SELECT customer_id,workflow_coverage FROM bmc_workflow_customer_card_coverage')
        profiles={int(p['customer_id']):p['workflow_coverage'] for p in cursor.fetchall()}
        for card in cards:
            if int(card['customer_id']) in profiles:
                card['workflow_coverage']=profiles[int(card['customer_id'])]
                card['coverage_scope']='customer'
        return json_safe({'agreements':agreements,'cards':cards})

def update_resource(kind,resource_id,payload,user):
    table='customer_fixed_price_agreements' if kind=='agreement' else 'tticket_prepaid_cards'
    if kind=='card' and 'monthly_price' in payload.model_fields_set:
        raise HTTPException(422,'Månedspris gælder kun fastprisaftaler')
    coverage=payload.workflow_coverage.model_dump()
    # Explicitly saving empty coverage means all tags; untouched legacy {} stays inert.
    coverage['auto_billing']=True
    tag_ids=sorted(set(coverage['tag_ids']+coverage['excluded_tag_ids']))
    if any(tag_id<=0 for tag_id in tag_ids): raise HTTPException(422,'Tag-ID skal være positivt')
    with transaction() as cursor:
        cursor.execute(f'SELECT * FROM {table} WHERE id=%s',(resource_id,))
        resource=cursor.fetchone()
        if not resource: raise HTTPException(404,'Aftale eller kort findes ikke')
        if tag_ids:
            cursor.execute('SELECT id FROM tags WHERE id=ANY(%s) AND is_active=TRUE',(tag_ids,))
            if {r['id'] for r in cursor.fetchall()}!=set(tag_ids): raise HTTPException(422,'Et tag findes ikke eller er inaktivt')
        # Lock pending time rows before the resource, matching settlement lock order.
        cursor.execute("SELECT t.id FROM tmodule_times t LEFT JOIN sag_sager s ON s.id=t.sag_id LEFT JOIN tmodule_customers c ON c.id=t.customer_id WHERE COALESCE(s.customer_id,c.hub_customer_id)=%s AND t.status NOT IN ('approved','billed') AND t.economy_order_draft_id IS NULL ORDER BY t.id FOR UPDATE OF t",(resource['customer_id'],))
        time_ids=[r['id'] for r in cursor.fetchall()]
        cursor.execute(f'SELECT * FROM {table} WHERE id=%s FOR UPDATE',(resource_id,))
        resource=cursor.fetchone()
        price_sql=',monthly_price=%s' if kind=='agreement' and 'monthly_price' in payload.model_fields_set else ''
        values=[Json(coverage)]
        if price_sql: values.append(payload.monthly_price)
        values.append(resource_id)
        cursor.execute(f'UPDATE {table} SET workflow_coverage=%s{price_sql},updated_at=now() WHERE id=%s RETURNING *',tuple(values))
        updated=cursor.fetchone()
        cursor.execute('INSERT INTO bmc_workflow_resource_history(resource_type,resource_id,created_by,before_value,after_value) VALUES(%s,%s,%s,%s,%s)',(kind,resource_id,str(user['id']),Json(json_safe(dict(resource))),Json(json_safe(dict(updated)))))
        if time_ids:
            cursor.execute('UPDATE tmodule_times SET workflow_revision=workflow_revision+1 WHERE id=ANY(%s) RETURNING id,workflow_revision',(time_ids,))
            for time in cursor.fetchall(): emit_event(cursor,'time.updated','time_entry',time['id'],time['workflow_revision'])
        return json_safe(dict(updated))

@router.put('/agreements/{resource_id}/coverage')
def update_agreement(resource_id:int,payload:ResourceUpdate,user=Depends(access)):
    return update_resource('agreement',resource_id,payload,user)

@router.put('/cards/{resource_id}/coverage')
def update_card(resource_id:int,payload:ResourceUpdate,user=Depends(access)):
    return update_resource('card',resource_id,payload,user)

@router.put('/customers/{customer_id}/card-coverage')
def update_customer_card_coverage(customer_id:int,payload:Coverage,user=Depends(access)):
    coverage=payload.model_dump()
    coverage['auto_billing']=True
    tag_ids=sorted(set(coverage['tag_ids']+coverage['excluded_tag_ids']))
    if any(tag_id<=0 for tag_id in tag_ids):
        raise HTTPException(422,'Tag-ID skal være positivt')
    with transaction() as cursor:
        cursor.execute('SELECT id FROM customers WHERE id=%s',(customer_id,))
        if not cursor.fetchone():
            raise HTTPException(404,'Kunden findes ikke')
        if tag_ids:
            cursor.execute('SELECT id FROM tags WHERE id=ANY(%s) AND is_active=TRUE',(tag_ids,))
            if {r['id'] for r in cursor.fetchall()}!=set(tag_ids):
                raise HTTPException(422,'Et tag findes ikke eller er inaktivt')
        # Match settlement lock order. Approved decisions are immutable and revalidated at settlement.
        cursor.execute("SELECT t.id FROM tmodule_times t LEFT JOIN sag_sager s ON s.id=t.sag_id LEFT JOIN tmodule_customers c ON c.id=t.customer_id WHERE COALESCE(s.customer_id,c.hub_customer_id)=%s AND t.status NOT IN ('approved','billed') AND t.economy_order_draft_id IS NULL ORDER BY t.id FOR UPDATE OF t",(customer_id,))
        time_ids=[r['id'] for r in cursor.fetchall()]
        cursor.execute('SELECT id FROM customers WHERE id=%s FOR UPDATE',(customer_id,))
        cursor.execute('SELECT workflow_coverage FROM bmc_workflow_customer_card_coverage WHERE customer_id=%s',(customer_id,))
        previous=cursor.fetchone()
        cursor.execute('INSERT INTO bmc_workflow_customer_card_coverage(customer_id,workflow_coverage) VALUES(%s,%s) ON CONFLICT(customer_id) DO UPDATE SET workflow_coverage=EXCLUDED.workflow_coverage,updated_at=now()', (customer_id,Json(coverage)))
        cursor.execute('INSERT INTO bmc_workflow_resource_history(resource_type,resource_id,created_by,before_value,after_value) VALUES(%s,%s,%s,%s,%s)',('customer_card',customer_id,str(user['id']),Json(json_safe(dict(previous))) if previous else Json({}),Json({'workflow_coverage':coverage})))
        if time_ids:
            cursor.execute('UPDATE tmodule_times SET workflow_revision=workflow_revision+1 WHERE id=ANY(%s) RETURNING id,workflow_revision',(time_ids,))
            for time in cursor.fetchall(): emit_event(cursor,'time.updated','time_entry',time['id'],time['workflow_revision'])
        return {'customer_id':customer_id,'workflow_coverage':coverage}