from .operation import *


def get_pattern_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'id'      : {'type': 'str'        , 'optional': False , 'readonly': True },
             'factors' : {'type': 'float_list' , 'optional': False , 'readonly': False } }


def get_pattern(name: str, id: str) -> dict[str, Any]:
    pas = read_all(name, f"select * from patterns where id = '{id}' order by _order")
    ps = []
    for r in pas:
        ps.append(float(r['factor']))
    return { 'id': id, 'factors': ps }


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

    old = get_pattern(name, id)

    new = { 'id': id }
    if 'factors' in cs.operations[0]:
        new['factors'] = cs.operations[0]['factors']
    else:
        new['factors'] = old['factors']

    # TODO: transaction ?
    redo_sql = f"delete from patterns where id = {f_id};"
    for f_factor in new['factors']:
        redo_sql += f"\ninsert into patterns (id, factor) values ({f_id}, {f_factor});"

    undo_sql = f"delete from patterns where id = {f_id};"
    for f_factor in old['factors']:
        undo_sql += f"\ninsert into patterns (id, factor) values ({f_id}, {f_factor});"

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

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def set_pattern(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, set_pattern_cache(name, cs))


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

    new = { 'id': id, 'factors': cs.operations[0]['factors'] }

    # TODO: transaction ?
    redo_sql = f"insert into _pattern (id) values ({f_id});"
    for f_factor in new['factors']:
        redo_sql += f"\ninsert into patterns (id, factor) values ({f_id}, {f_factor});"

    undo_sql = f"delete from patterns where id = {f_id};"
    undo_sql += f"\ndelete from _pattern where id = {f_id};"

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

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def add_pattern(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, add_pattern_cache(name, cs))


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

    old = get_pattern(name, id)

    redo_sql = f"delete from patterns where id = {f_id};"
    redo_sql += f"\ndelete from _pattern where id = {f_id};"

    # TODO: transaction ?
    undo_sql = f"insert into _pattern (id) values ({f_id});"
    for f_factor in old['factors']:
        undo_sql += f"\ninsert into patterns (id, factor) values ({f_id}, {f_factor});"

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

    return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)


def delete_pattern(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, delete_pattern_cache(name, cs))