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), \
    'elevation' : define_property(float_type), \
    'demand'    : define_property(float_type, True), \
    'pattern'   : define_property(str_type, True), \
    'coord'     : define_property(client_point_type), \
    'links'     : define_property(str_list_type, False, True)}


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


def _query_junction(name: str, id: str) -> Row | None:
    return read(name, f"select id, elevation, demand, pattern from junctions where id = '{id}'")


def add_junction(name: str, id: str, x: float, y: float, elevation: float) -> ChangeSet:
    if is_junction(name, id):
        return ChangeSet()

    sql = f"insert into _node (id, type) values ('{id}', '{JUNCTION}');"
    sql += f"\ninsert into junctions (id, elevation) values ('{id}', {elevation});"
    sql += f"\ninsert into coordinates (node, coord) values ('{id}', '({x}, {y})');"

    undo = f"delete from coordinates where node = ''{id}'';"
    undo += f"\ndelete from junctions where id = ''{id}'';"
    undo += f"\ndelete from _node where id = ''{id}'';"

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


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

    ps: dict[str, str] = {}
    ps['elevation'] = float(row['elevation'])
    ps['demand'] = float(row['demand']) if row['demand'] != None else None
    ps['pattern'] = row['pattern']
    ps['coord'] = get_node_coord(name, id)
    ps['links'] = get_node_links(name, id)
    return ps


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

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

    sql = f"delete from coordinates where node = '{id}';"
    sql += f"\ndelete from junctions where id = '{id}';"
    sql += f"\ndelete from _node where id = '{id}';"

    undo = f"insert into _node (id, type) values (''{id}'', ''{JUNCTION}'');"
    undo += f"\ninsert into junctions (id, elevation, demand, pattern) values (''{id}'', {old['elevation']}, {old['demand']}, {old['pattern']});"
    undo += f"\ninsert into coordinates (node, coord) values (''{id}'', {old['coord']});"

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


def set_junction(name: str, id: str, properties: dict[str, Any]) -> ChangeSet:
    if not is_junction(name, id):
        return ChangeSet()

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

    new = get_junction(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 junctions set elevation = {new['elevation']}, demand = {new['demand']}, pattern = {new['pattern']} where id = '{id}';"
    undo = ""
    if 'coord' in ps:
        sql += f"\nupdate coordinates set coord = {new['coord']} where node = '{id}';"
        undo = f"update coordinates set coord = {old['coord']} where node = ''{id}'';"
    undo += f"\nupdate junctions set elevation = {old['elevation']}, demand = {old['demand']}, pattern = {old['pattern']} where id = ''{id}'';"

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