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


def add_reservoir(name: str, id: str, x: float, y: float, head: float) -> ChangeSet:
    sql = f"insert into reservoirs (id, head) values ('{id}', {head});"
    undo_sql = f'delete from reservoirs where id = "{id}";'
    return add_node(name, RESERVOIR, id, x, y, sql, undo_sql)


def _get_reservoir(name: str, id: str) -> Row | None:
    return query(name, f"select head, pattern from reservoirs where id = '{id}'")


def delete_reservoir(name: str, id: str) -> ChangeSet:
    if not is_reservoir(name, id):
        return ChangeSet()

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

    head = row['head']
    pattern = decorate(row['pattern'], 'str', True)

    sql = f"delete from reservoirs where id = '{id}';"
    undo_sql = f'insert into reservoirs (id, head, pattern) values ("{id}", {head}, {pattern});'

    return delete_node(name, RESERVOIR, id, sql, undo_sql)


def get_reservoir_head(name: str, id: str) -> float | None:
    row = _get_reservoir(name, id)
    return float(row['head']) if row != None else None


def get_reservoir_pattern(name: str, id: str) -> str | None:
    row = _get_reservoir(name, id)
    if row != None:
        return row['pattern'] if row['pattern'] != None else 'NULL'
    else:
        return None


def get_reservoir_coord(name: str, id: str) -> dict[str, float] | None:
    return get_node_coord(name, id)


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

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

    return update(name, RESERVOIR, 'reservoirs', 'id', id, key, key_type, row[key], value, optional)


def set_reservoir_head(name: str, id: str, head: float) -> ChangeSet:
    return _set_reservoir(name, id, 'head', 'float', str(head))


def set_reservoir_pattern(name: str, id: str, pattern: str) -> ChangeSet:
    if not is_pattern(name, id):
        return ChangeSet()

    return _set_reservoir(name, id, 'pattern', 'str', pattern, True)


def set_reservoir_coord(name: str, id: str, x: float, y: float) -> ChangeSet:
    if not is_reservoir(name, id):
        return ChangeSet()

    return set_node_coord(name, RESERVOIR, id, x, y)