from psycopg.rows import dict_row, Row
from .connection import g_conn_dict as conn
from .operation import *
from .change_set import ChangeSet

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

JUNCTION = "junction"
RESERVOIR = "reservoir"
TANK = "tank"
PIPE = "pipe"
PUMP = "pump"
VALVE = "valve"

def _get_from(name: str, id: str, base_type: str) -> Row | None:
    with conn[name].cursor(row_factory=dict_row) as cur:
        cur.execute(f"select * from {base_type} where id = '{id}'")
        return cur.fetchone()

def is_node(name: str, id: str) -> bool:
    return _get_from(name, id, _NODE) != None

def is_junction(name: str, id: str) -> bool:
    row = _get_from(name, id, _NODE)
    return row != None and row['type'] == JUNCTION

def is_reservoir(name: str, id: str) -> bool:
    row = _get_from(name, id, _NODE)
    return row != None and row['type'] == RESERVOIR

def is_tank(name: str, id: str) -> bool:
    row = _get_from(name, id, _NODE)
    return row != None and row['type'] == TANK

def is_link(name: str, id: str) -> bool:
    return _get_from(name, id, _LINK) != {}

def is_pipe(name: str, id: str) -> bool:
    row = _get_from(name, id, _LINK)
    return row != None and row['type'] == PIPE

def is_pump(name: str, id: str) -> bool:
    row = _get_from(name, id, _LINK)
    return row != None and row['type'] == PUMP

def is_valve(name: str, id: str) -> bool:
    row = _get_from(name, id, _LINK)
    return row != None and row['type'] == VALVE

def is_curve(name: str, id: str) -> bool:
    return _get_from(name, id, _CURVE) != None

def is_pattern(name: str, id: str) -> bool:
    return _get_from(name, id, _PATTERN) != None

def _get_all(name: str, base_type: str) -> list[str]:
    ids : list[str] = []
    with conn[name].cursor(row_factory=dict_row) as cur:
        cur.execute(f"select id from {base_type} order by id")
        for record in cur:
            ids.append(record['id'])
    return ids

def get_nodes(name: str) -> list[str]:
    return _get_all(name, _NODE)

def get_links(name: str) -> list[str]:
    return _get_all(name, _LINK)

def get_curves(name: str) -> list[str]:
    return _get_all(name, _CURVE)

def get_patterns(name: str) -> list[str]:
    return _get_all(name, _PATTERN)

def add_node(name: str, node_type: str, id: str, x: float, y: float, table_sql: str, table_undo_sql: str) -> ChangeSet:
    if is_node(name, id):
        return

    with conn[name].cursor() as cur:
        sql = f"insert into _node (id, type) values ('{id}', '{node_type}'); "
        sql += table_sql
        sql += f" insert into coordinates (node, coord) values ('{id}', '({x}, {y})');"
        cur.execute(sql)

        redo = sql.replace("'", '"')
        undo = f'delete from coordinates where node = "{id}"; '
        undo += table_undo_sql
        undo += f' delete from _node where id = "{id}";'
        add_operation(name, redo, undo)

    change = ChangeSet()
    change.add(node_type, id)
    return change

def delete_node(name: str, node_type: str, id: str, table_sql: str, table_undo_sql: str) -> ChangeSet:
    if not is_node(name, id):
        return

    with conn[name].cursor(row_factory=dict_row) as cur:
        cur.execute(f"select * from coordinates where node = '{id}'")
        row = cur.fetchone()
        if row == None:
            return

        coord = row['coord']

        sql = f"delete from coordinates where node = '{id}'; "
        sql += table_sql
        sql += f" delete from _node where id = '{id}';"
        cur.execute(sql)

        redo = sql.replace("'", '"')
        undo = f'insert into _node (id, type) values ("{id}", "{node_type}"); '
        undo += table_undo_sql
        undo += f' insert into coordinates (node, coord) values ("{id}", "{coord}");'
        add_operation(name, redo, undo)

    change = ChangeSet()
    change.delete(node_type, id)
    return change