from typing import Any
from psycopg.rows import Row
from .s0_base import *
from .change_set import ChangeSet
from .s24_coordinates import *
from .utility import *
from .schema import *


schema: dict[str, dict[str, Any]] = { \
    'id'        : define_property(str_type, False, True), \
    'node1'     : define_property(str_type), \
    'node2'     : define_property(str_type)}


def get_pump_schema(name: str) -> dict[str, dict[str, Any]]:
    return schema


def _query_pump(name: str, id: str) -> Row | None:
    return read(name, f"select * from pumps where id = '{id}'")


def _get_pump_node1(name: str, id: str) -> str | None:
    row = _query_pump(name, id)
    return row['node1'] if row != None else None


def _get_pump_node2(name: str, id: str) -> str | None:
    row = _query_pump(name, id)
    return row['node2'] if row != None else None


def add_pump(name: str, id: str, node1: str, node2: str) -> ChangeSet:
    if is_pump(name, id):
        return ChangeSet()
    if not is_node(name, node1):
        return ChangeSet()
    if not is_node(name, node2):
        return ChangeSet()
    if node1 == node2:
        return ChangeSet()

    sql = f"insert into _link (id, type) values ('{id}', '{PUMP}');"
    sql += f"\ninsert into pumps (id, node1, node2) values ('{id}', '{node1}', '{node2}');"

    undo = f"delete from pumps where id = ''{id}'';"
    undo += f"\ndelete from _link where id = ''{id}'';"

    write(name, sql)
    add_operation(name, sql.replace("'", "''"), undo, 'add_pump', API_ADD, PUMP, id)
    return get_current_change_set(name)


def get_pump(name: str, id: str) -> dict[str, Any] | None:
    row = _query_pump(name, id)
    if row == None:
        return None

    ps: dict[str, str] = {}
    ps['id'] = id
    ps['node1'] = row['node1']
    ps['node2'] = row['node2']
    return ps


def set_pump(name: str, id: str, properties: dict[str, Any]) -> ChangeSet:
    if not is_pump(name, id):
        return ChangeSet()
    if 'node1' in properties:
        if not is_node(name, properties['node1']) or _get_pump_node2(name, id) == properties['node1']:
            return ChangeSet()
    if 'node2' in properties:
        if not is_node(name, properties['node2']) or _get_pump_node1(name, id) == properties['node2']:
            return ChangeSet()
    if 'node1' in properties and 'node2' in properties:
        if properties['node1'] == properties['node2']:
            return ChangeSet()

    old = Serialize(get_pump(name, id), schema).to_storage()

    new = get_pump(name, id)
    ps: list[str] = []
    for key in properties:
        if key in schema and schema[key]['readonly'] == False:
            new[key] = properties[key]
            ps.append(key)
    new = Serialize(new, schema).to_execution()

    sql = f"update pumps set node1 = {new['node1']}, node2 = {new['node2']} where id = '{id}';"
    undo = f"update pumps set node1 = {old['node1']}, node2 = {old['node2']} where id = ''{id}'';"

    write(name, sql)
    add_operation(name, sql.replace("'", "''"), undo, 'set_pump', API_UPDATE, PUMP, id, ps)
    return get_current_change_set(name)


def delete_pump(name: str, id: str) -> ChangeSet:
    row = get_pump(name, id)
    if row == None:
        return ChangeSet()

    old = Serialize(get_pump(name, id), schema).to_storage()

    sql = f"delete from pumps where id = '{id}';"
    sql += f"\ndelete from _link where id = '{id}';"

    undo = f"insert into _link (id, type) values (''{id}'', ''{PUMP}'');"
    undo += f"\ninsert into pumps (id, node1, node2) values (''{id}'', {old['node1']}, {old['node2']});"

    write(name, sql)
    add_operation(name, sql.replace("'", "''"), undo, 'delete_pump', API_DELETE, PUMP, id)
    return get_current_change_set(name)