from psycopg.rows import dict_row
from api.connection import g_conn_dict as conn
from api.operation import *

_NODE = "_node"
_LINK = "_link"
_CURVE = "_curve"
_PATTERN = "_pattern"

JUNCTION = "JUNCTION"
RESERVOIR = "RESERVOIR"
TANK = "TANK"
PIPE = "PIPE"
PUMP = "PUMP"
VALVE = "VALVE"


# add

def _add_id_type(name: str, id: str, type: str, table: str) -> None:
    with conn[name].cursor() as cur:
        sql = f"insert into {table} (id, type) values ('{id}', '{type}')"
        cur.execute(sql)
        redo = sql.replace("'", '"')
        undo = f'delete from {table} where id = "{id}"'
        add_operation(name, redo, undo)

def _add_id(name: str, id: str, table: str) -> None:
    with conn[name].cursor() as cur:
        sql = f"insert into {table} (id) values ('{id}')"
        cur.execute(sql)
        redo = sql.replace("'", '"')
        undo = f'delete from {table} where id = "{id}"'
        add_operation(name, redo, undo)

def add_node(name: str, id: str, type: str) -> None:
    return _add_id_type(name, id, type, _NODE)

def add_link(name: str, id: str, type: str) -> None:
    return _add_id_type(name, id, type, _LINK)

def add_curve(name: str, id: str) -> None:
    return _add_id(name, id, _CURVE)

def add_pattern(name: str, id: str) -> None:
    return _add_id(name, id, _PATTERN)


# have

def _have_impl(name: str, id: str, table: str) -> bool:
    with conn[name].cursor() as cur:
        cur.execute(f"select * from {table} where id = '{id}'")
        return cur.rowcount > 0

def have_node(name: str, id: str) -> bool:
    return _have_impl(name, id, _NODE)

def have_link(name: str, id: str) -> bool:
    return _have_impl(name, id, _LINK)

def have_curve(name: str, id: str) -> bool:
    return _have_impl(name, id, _CURVE)

def have_pattern(name: str, id: str) -> bool:
    return _have_impl(name, id, _PATTERN)


# get
def _get_impl(name: str, id: str, table: str) -> dict[str, str]:
    with conn[name].cursor(row_factory=dict_row) as cur:
        cur.execute(f"select * from {table} where id = '{id}'")
        if cur.rowcount > 0:
            return cur.fetchone()
        else:
            return {}

def get_node(name: str, id: str) -> dict[str, str]:
    return _get_impl(name, id, _NODE)

def get_link(name: str, id: str) -> dict[str, str]:
    return _get_impl(name, id, _LINK)

def get_curve(name: str, id: str) -> dict[str, str]:
    return _get_impl(name, id, _CURVE)

def get_pattern(name: str, id: str) -> dict[str, str]:
    return _get_impl(name, id, _PATTERN)


# delete

def _delete_id_type(name: str, id: str, type: str, table: str) -> None:
    with conn[name].cursor() as cur:
        sql = f"delete from {table} where id = '{id}'"
        cur.execute(sql)
        redo = sql.replace("'", '"')
        undo = f'insert into {table} (id, type) values ("{id}", "{type}")'
        add_operation(name, redo, undo)

def _delete_id(name:str, id: str, table: str) -> None:
    with conn[name].cursor() as cur:
        sql = f"delete from {table} where id = '{id}'"
        cur.execute(sql)
        redo = sql.replace("'", '"')
        undo = f'insert into {table} (id) values ("{id}")'
        add_operation(name, redo, undo)

def delete_node(name: str, id: str) -> None:
    row = get_node(name, id)
    if row == {}:
        return
    return _delete_id_type(name, id, row['type'], _NODE)

def delete_link(name: str, id: str) -> None:
    row = get_link(name, id)
    if row == {}:
        return
    return _delete_id_type(name, id, row['type'], _LINK)

def delete_curve(name: str, id: str) -> None:
    row = get_curve(name, id)
    if row == {}:
        return
    return _delete_id(name, id, _CURVE)

def delete_pattern(name: str, id: str) -> None:
    row = get_pattern(name, id)
    if row == {}:
        return
    return _delete_id(name, id, _PATTERN)