from .operation import *

CURVE_TYPE_PUMP = 'PUMP'
CURVE_TYPE_EFFICIENCY = 'EFFICIENCY'
CURVE_TYPE_VOLUME = 'VOLUME'
CURVE_TYPE_HEADLOSS = 'HEADLOSS'

def get_curve_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'id'     : {'type': 'str'  , 'optional': False , 'readonly': True },
             'c_type' : {'type': 'str'  , 'optional': False , 'readonly': False},
             'coords' : {'type': 'list' , 'optional': False , 'readonly': False, 
                           'element': { 'x'  : {'type': 'float' , 'optional': False , 'readonly': False }, 
                                        'y'  : {'type': 'float' , 'optional': False , 'readonly': False } }}}


def get_curve(name: str, id: str) -> dict[str, Any]:
    c_one = read(name, f"select * from _curve where id = '{id}'")
    cus = read_all(name, f"select * from curves where id = '{id}' order by _order")
    cs = []
    for r in cus:
        cs.append({ 'x': float(r['x']), 'y': float(r['y']) })
    d = {}
    d['id'] = id
    d['c_type'] = c_one['type']
    d['coords'] = cs
    return d


def set_curve_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
    id = cs.operations[0]['id']
    f_id = f"'{id}'"

    old = get_curve(name, id)
    old_f_type = f"'{old['c_type']}'"

    new = { 'id': id }
    if 'coords' in cs.operations[0]:
        new['coords'] = cs.operations[0]['coords']
    else:
        new['coords'] = old['coords']
    if 'c_type' in cs.operations[0]:
        new['c_type'] = cs.operations[0]['c_type']
    else:
        new['c_type'] = old['c_type']
    new_f_type = f"'{new['c_type']}'"

    # TODO: transaction ?
    redo_sql = f"delete from curves where id = {f_id};"
    redo_sql += f"\nupdate _curve set type = {new_f_type} where id = {f_id};"
    for xy in new['coords']:
        f_x, f_y = xy['x'], xy['y']
        redo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"

    undo_sql = f"delete from curves where id = {f_id};"
    undo_sql += f"\nupdate _curve set type = {old_f_type} where id = {f_id};"
    for xy in old['coords']:
        f_x, f_y = xy['x'], xy['y']
        undo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"

    redo_cs = g_update_prefix | { 'type': 'curve' } | new
    undo_cs = g_update_prefix | { 'type': 'curve' } | old

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def set_curve(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, set_curve_cache(name, cs))


def add_curve_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
    id = cs.operations[0]['id']
    f_id = f"'{id}'"

    new = { 'id': id, 'c_type': cs.operations[0]['c_type'], 'coords': [] }
    new_f_type = f"'{new['c_type']}'"

    # TODO: transaction ?
    redo_sql = f"insert into _curve (id, type) values ({f_id}, {new_f_type});"
    for xy in cs.operations[0]['coords']:
        x, y = float(xy['x']), float(xy['y'])
        f_x, f_y = x, y
        redo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"
        new['coords'].append({ 'x': x, 'y': y })

    undo_sql = f"delete from curves where id = {f_id};"
    undo_sql += f"\ndelete from _curve where id = {f_id};"

    redo_cs = g_add_prefix | { 'type': 'curve' } | new
    undo_cs = g_delete_prefix | { 'type': 'curve' } | { 'id' : id }

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def add_curve(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, add_curve_cache(name, cs))


def delete_curve_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
    id = cs.operations[0]['id']
    f_id = f"'{id}'"

    old = get_curve(name, id)
    old_f_type = f"'{old['c_type']}'"

    redo_sql = f"delete from curves where id = {f_id};"
    redo_sql += f"\ndelete from _curve where id = {f_id};"

    # TODO: transaction ?
    undo_sql = f"insert into _curve (id, type) values ({f_id}, {old_f_type});"
    for xy in old['coords']:
        f_x, f_y = xy['x'], xy['y']
        undo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"

    redo_cs = g_delete_prefix | { 'type': 'curve' } | { 'id' : id }
    undo_cs = g_add_prefix | { 'type': 'curve' } | old

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def delete_curve(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, delete_curve_cache(name, cs))