from psycopg.rows import Row
from .s0_base import *
from .change_set import ChangeSet
from .utility import *


VALVES_TYPE_PRV = 'prv'
VALVES_TYPE_PSV = 'psv'
VALVES_TYPE_PBV = 'pbv'
VALVES_TYPE_FCV = 'fcv'
VALVES_TYPE_TCV = 'tcv'
VALVES_TYPE_GPV = 'gpv'


def add_valve(name: str, id: str, node1: str, node2: str, diameter: float = 0, type: str = VALVES_TYPE_PRV, setting: float = 0, minor_loss: float = 0) -> ChangeSet:
    if not is_node(name, node1):
        return ChangeSet()
    if not is_node(name, node2):
        return ChangeSet()
    if node1 == node2:
        return ChangeSet()
    if type != VALVES_TYPE_PRV and type != VALVES_TYPE_PSV and type != VALVES_TYPE_PBV and type != VALVES_TYPE_FCV and type != VALVES_TYPE_TCV and type != VALVES_TYPE_GPV:
        return ChangeSet()

    sql = f"insert into valves (id, node1, node2, diameter, type, setting, minor_loss) values ('{id}', '{node1}', '{node2}', {diameter}, '{type}', {setting}, {minor_loss});"
    undo_sql = f'delete from valves where id = "{id}";'
    return add_link(name, VALVE, id, sql, undo_sql)


def _get_valve(name: str, id: str) -> Row | None:
    return query(name, f"select node1, node2, diameter, type, setting, minor_loss from valves where id = '{id}'")


def delete_valve(name: str, id: str) -> ChangeSet:
    if not is_valve(name, id):
        return ChangeSet()

    row = _get_valve(name, id)
    if row == None:
        return ChangeSet()

    node1, node2, diameter, type, setting, minor_loss = row['node1'], row['node2'], row['diameter'], row['type'], row['setting'], row['minor_loss']

    sql = f"delete from valves where id = '{id}';"
    undo_sql = f'insert into valves (id, node1, node2, diameter, type, setting, minor_loss) values ("{id}", "{node1}", "{node2}", {diameter}, "{type}", {setting}, {minor_loss});'

    return delete_link(name, VALVE, id, sql, undo_sql)


def get_valve_node1(name: str, id: str) -> str | None:
    row = _get_valve(name, id)
    return row['node1'] if row != None else None


def get_valve_node2(name: str, id: str) -> str | None:
    row = _get_valve(name, id)
    return row['node2'] if row != None else None


def get_valve_diameter(name: str, id: str) -> float | None:
    row = _get_valve(name, id)
    return float(row['diameter']) if row != None else None


def get_valve_type(name: str, id: str) -> str | None:
    row = _get_valve(name, id)
    return row['type'] if row != None else None


def get_valve_setting(name: str, id: str) -> float | None:
    row = _get_valve(name, id)
    return float(row['setting']) if row != None else None


def get_valve_minor_loss(name: str, id: str) -> float | None:
    row = _get_valve(name, id)
    return float(row['minor_loss']) if row != None else None


def _set_valve(name: str, id: str, key: str, key_type: str, value: str, optional: bool = False) -> ChangeSet:
    if not is_valve(name, id):
        return ChangeSet()

    row = _get_valve(name, id)
    if row == None:
        return ChangeSet()

    return update(name, VALVE, 'valves', 'id', id, key, key_type, row[key], value, optional)


def set_valve_node1(name: str, id: str, node1: str) -> ChangeSet:
    if not is_node(name, node1):
        return ChangeSet()
    if get_valve_node2(name, id) == node1:
        return ChangeSet()

    return _set_valve(name, id, 'node1', 'str', str(node1))


def set_valve_node2(name: str, id: str, node2: str) -> ChangeSet:
    if not is_node(name, node2):
        return ChangeSet()
    if get_valve_node1(name, id) == node2:
        return ChangeSet()

    return _set_valve(name, id, 'node2', 'str', str(node2))


def set_valve_diameter(name: str, id: str, diameter: float) -> ChangeSet:
    return _set_valve(name, id, 'diameter', 'float', str(diameter))


def set_valve_type(name: str, id: str, type: str) -> ChangeSet:
    if type != VALVES_TYPE_PRV and type != VALVES_TYPE_PSV and type != VALVES_TYPE_PBV and type != VALVES_TYPE_FCV and type != VALVES_TYPE_TCV and type != VALVES_TYPE_GPV:
        return ChangeSet()

    return _set_valve(name, id, 'type', 'str', type)


def set_valve_setting(name: str, id: str, setting: float) -> ChangeSet:
    return _set_valve(name, id, 'setting', 'float', str(setting))


def set_valve_minor_loss(name: str, id: str, minor_loss: float) -> ChangeSet:
    return _set_valve(name, id, 'minor_loss', 'float', str(minor_loss))