# Copyright 2023 https://github.com/ShishirPatil/gorilla
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This file is modified from https://github.com/ShishirPatil/gorilla/blob/main/eval/eval-scripts/ast_eval_tf.py

import tree_sitter_python as tspython
from tree_sitter import Language, Parser


# Get all the subtrees given a root_node
def get_all_sub_trees(root_node):
    node_stack = []
    sub_tree_sexp_list = []
    depth = 1
    # text = root_node.text
    node_stack.append([root_node, depth])
    while len(node_stack) != 0:
        cur_node, cur_depth = node_stack.pop()
        if cur_node.child_count > 0:
            sub_tree_sexp_list.append(
                [cur_node.sexp(), cur_depth, cur_node, cur_node.children[0].text]
            )
        else:
            sub_tree_sexp_list.append([cur_node.sexp(), cur_depth, cur_node, None])
        for child_node in cur_node.children:
            if len(child_node.children) != 0:
                depth = cur_depth + 1
                node_stack.append([child_node, depth])
    return sub_tree_sexp_list


# Parse the program into AST trees
def ast_parse(candidate):
    LANGUAGE = Language(tspython.language())
    parser = Parser(LANGUAGE)

    candidate_tree = parser.parse(bytes(candidate, 'utf8')).root_node
    return candidate_tree


# Get all the arguments in the ast tree
def get_args(node):
    if node.child_count == 0:
        return []
    args_list = []
    for child in node.children[0].children[0].children[1].children:
        if 'model=' in child.text.decode() or 'model =' in child.text.decode():
            args_list.append(child.children[2].text)
        elif (
            child.text.decode() != '('
            and child.text.decode() != ')'
            and child.text.decode() != ','
        ):
            args_list.append(child.text)
    return args_list


# Check if there is an api match
def ast_check(candidate_subtree_list, base_tree_list):
    for idx, base_tree in enumerate(base_tree_list):
        if base_tree.children[0].children[0].child_count == 0:
            continue
        api_name = base_tree.children[0].children[0].children[0].text
        for candidate_tree in candidate_subtree_list:
            if candidate_tree[3] == api_name:
                break
        # Now we have a sub-tree
        candidate_tree = candidate_tree[2]
        args_list = get_args(base_tree)
        if len(args_list) == 0:
            continue
        ast_match = True
        for arg in args_list:
            if arg.decode().lstrip("'").rstrip("'") not in candidate_tree.text.decode():
                ast_match = False
                break
        if ast_match:
            return idx
    return -1


def ast_eval_tf(api_database, qa_pairs, ast_database, question_id, response):
    # Check correctness
    correct = False
    hallucination = False
    output = response
    # Index the "api_call" domain
    output = output.split('api_call')
    if len(output) == 1:
        api_call = output[0]
    else:
        # Parse the output
        output = output[1].split('api_provider')[0]
        if ':' not in output:
            start = 0
        else:
            start = output.index(':')
        if ')' not in output:
            end = -2
        else:
            end = output.rindex(')')
        api_call = output[start + 2 : end + 1]
    # Parse the api_call into AST tree
    ast_tree = ast_parse(api_call)
    # Search for a subtree
    ast_subtree_list = get_all_sub_trees(ast_tree)
    # Check which ast tree is matching
    database_index = ast_check(ast_subtree_list, ast_database)
    # We cannot index this ast in our database
    if database_index == -1:
        hallucination = True
    # We index our reference api_call
    ref_api_call = api_database[database_index]
    # Check for functionality
    if ref_api_call['domain'] == qa_pairs[question_id - 1]['domain']:
        correct = True
    return correct, hallucination
