#!/usr/bin/env python3
# Copyright 2025 Yingwei Zheng
#
# 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.

import os
import requests
import subprocess
from pathlib import Path
import time
import tqdm
import llvm_helper

github_token = os.environ["LAB_GITHUB_TOKEN"]
cache_dir = os.environ["LAB_ISSUE_CACHE"]
postfix_extract = os.path.join(os.path.dirname(__file__), "postfix_extract.py")
session = requests.Session()
session.headers.update(
    {
        "X-GitHub-Api-Version": "2022-11-28",
        "Authorization": f"Bearer {github_token}",
        "Accept": "application/vnd.github+json",
    }
)

issue_id_begin = 76663  # Since 2024-01-01
issue_id_end = 132850


def wait(progress):
    try:
        rate_limit = session.get("https://api.github.com/rate_limit", timeout=10).json()
        if rate_limit["rate"]["remaining"] == 0:
            next_window = rate_limit["rate"]["reset"]
            while time.time() < next_window:
                progress.set_description(f"wait {int(next_window - time.time())}s")
                time.sleep(10)
    except Exception:
        time.sleep(60)
        pass


def fetch(issue_id):
    data_json_path = os.path.join(llvm_helper.dataset_dir, f"{issue_id}.json")
    if os.path.exists(data_json_path):
        return False

    issue_url = f"https://api.github.com/repos/llvm/llvm-project/issues/{issue_id}"
    issue = session.get(issue_url).json()
    if "message" in issue and (
        issue["message"] == "Not Found" or issue["message"] == "This issue was deleted"
    ):
        return False
    if issue["state"] != "closed" or issue["state_reason"] != "completed":
        return False
    if "issue" not in issue["html_url"]:
        return False
    has_valid_label = False
    is_llvm_middleend = False
    for label in issue["labels"]:
        label_name = label["name"]
        if label_name == "miscompilation":
            has_valid_label = True
        if "crash" in label_name:
            has_valid_label = True
        if "hang" in label_name:
            has_valid_label = True
        if "llvm" in label_name or label_name == "vectorizers":
            is_llvm_middleend = True
        for key in [
            "backend",
            "clang:",
            "clangd",
            "clang-tidy",
            "mlir:",
            "tools:",
            "flang:",
        ]:
            if key in label_name:
                return False
        if label_name in [
            "invalid",
            "wontfix",
            "duplicate",
            "undefined behavior",
            "llvm:SelectionDAG",
            "llvm:globalisel",
            "llvm:regalloc",
            "llvm:codegen",
            "llvm-reduce",
            "llvm:bitcode",
            "llvm:openmpirbuilder",
            "BOLT",
        ]:
            return False
    if not has_valid_label:
        return False
    if not is_llvm_middleend:
        return False

    try:
        out = subprocess.check_output(
            ["python3", postfix_extract, str(issue_id)], stderr=subprocess.DEVNULL
        ).decode()
        if "This issue is marked as invalid" in out:
            return False
        return True
    except subprocess.CalledProcessError:
        return True


os.makedirs(cache_dir, exist_ok=True)
success = 0
progress = tqdm.tqdm(range(issue_id_begin, issue_id_end + 1))
for issue_id in progress:
    progress.set_description(f"Success {success}")
    cache_file = os.path.join(cache_dir, str(issue_id))
    if os.path.exists(cache_file):
        progress.refresh()
        continue
    while True:
        try:
            if fetch(issue_id):
                success += 1
            else:
                Path(cache_file).touch()
            break
        except KeyError as e:
            wait(progress)
        except requests.exceptions.RequestException:
            wait(progress)
        except ValueError:
            wait(progress)
        except Exception as e:
            print(type(e), e)
            exit(0)