From 82736673c35fed1f91bd359697209db4b50c840e Mon Sep 17 00:00:00 2001
From: Xevion <xevion@xevion.dev>
Date: Sun, 8 Oct 2023 17:25:14 -0500
Subject: [PATCH] Fetch questions from GraphQL API, pydantic parsing models

---
 .generate/questions.graphql |  23 +++++
 .generate/questions.py      | 163 ++++++++++++++++++++++++++++++++++++
 2 files changed, 186 insertions(+)
 create mode 100644 .generate/questions.graphql
 create mode 100644 .generate/questions.py

diff --git a/.generate/questions.graphql b/.generate/questions.graphql
new file mode 100644
index 0000000..12ed545
--- /dev/null
+++ b/.generate/questions.graphql
@@ -0,0 +1,23 @@
+query problemsetQuestionList($categorySlug: String, $limit: Int, $skip: Int, $filters: QuestionListFilterInput) {
+  problemsetQuestionList: questionList(
+    categorySlug: $categorySlug
+    limit: $limit
+    skip: $skip
+    filters: $filters
+  ) {
+    total: totalNum
+    questions: data {
+      difficulty
+      freqBar
+      title
+      titleSlug
+      topicTags {
+        name
+        id
+        slug
+      }
+      hasSolution
+      hasVideoSolution
+    }
+  }
+}
\ No newline at end of file
diff --git a/.generate/questions.py b/.generate/questions.py
new file mode 100644
index 0000000..772c9a6
--- /dev/null
+++ b/.generate/questions.py
@@ -0,0 +1,163 @@
+"""
+questions.py
+
+Module for pulling down, caching, and looking up question data easily.
+"""
+from dataclasses import dataclass
+import json
+from pathlib import Path
+import time
+from typing import List
+from logging import getLogger
+from pydantic import BaseModel
+from requests import Session
+
+logger = getLogger(__name__)
+
+query = """
+
+"""
+
+
+class Tag(BaseModel):
+    """
+    A class representing a tag.
+    """
+
+    slug: str
+    name: str
+
+
+class Question(BaseModel):
+    """
+    A class representing a question.
+    """
+
+    id: int
+    slug: str
+    title: str
+    body: str
+    tags: List[Tag]
+
+
+class QuestionDatabase(object):
+    """
+    A class for managing the question database.
+    """
+
+    def __init__(self, cache_path: Path, cache_time: int) -> None:
+        """
+        Initializes the question database.
+
+        :param cache_time: The amount of time to cache all questions for, in seconds.
+        """
+        self.client = Session()
+        self.client.headers["Content-Type"] = "application/json"
+        self.client.headers["Referer"] = "https://leetcode.com/problemset/all/"
+        self.client.headers["User-Agent"] = "lc-track/0.0.1"
+        self.client.headers["Accept"] = "application/json"
+
+        # Cache path exists
+        if cache_path.exists():
+            if not cache_path.is_file():
+                raise ValueError(f"Cache path {cache_path} is not a file.")
+
+            with cache_path.open("r") as cache_file:
+                raw_cache = json.load(cache_file)
+
+            cache_elapsed = time.time() - raw_cache["fetch_time"]
+            if cache_elapsed < cache_time:
+                self.questions = [
+                    Question(**question) for question in raw_cache["questions"]
+                ]
+                logger.info(f"Loaded {len(self.questions)} questions from cache.")
+                return
+
+        # Make sure the directory holding it does exist (this shouldn't ever be raised, so this is just a sanity check)
+        if not cache_path.parent.exists():
+            raise RuntimeError(
+                f"Directory where cache would exist ({cache_path.parent}) does not exist."
+            )
+
+        # Fetch cache questions
+        logger.info("Fetching questions from LeetCode...")
+
+        logger.debug("Fetching total number of questions...")
+        totalQuestionsQuery = """
+        query getTotalQuestions($categorySlug: String, $filters: QuestionListFilterInput) {
+            questions: questionList(
+                categorySlug: $categorySlug
+                limit: 1,
+                filters: $filters
+                skip: 0
+            ) {
+                total: totalNum
+            }
+        }"""
+        total_questions_response = self.client.get(
+            "https://leetcode.com/graphql",
+            json={
+                "query": totalQuestionsQuery,
+                "variables": {"categorySlug": "", "filters": {}},
+            },
+        )
+
+        if not total_questions_response.ok:
+            raise RuntimeError(
+                f"Failed to fetch total number of questions: {total_questions_response.status_code} {total_questions_response.reason}"
+            )
+
+        total: int = total_questions_response.json()["data"]["questions"]["total"]
+        logger.debug(f"Total number of questions: {total:,}")
+
+        logger.debug("Fetching questions...")
+        questionsQuery = """
+        query questionsList($categorySlug: String, $limit: Int, $skip: Int, $filters: QuestionListFilterInput) {
+            problemsetQuestionList: questionList(
+                categorySlug: $categorySlug
+                limit: $limit
+                skip: $skip
+                filters: $filters
+            ) {
+                total: totalNum
+                questions: data {
+                    difficulty
+                    title
+                    titleSlug
+                    id: questionFrontendId
+                    topicTags {
+                        name
+                        slug
+                    }
+                }
+            }
+        }
+        """
+        questions_response = self.client.get(
+            "https://leetcode.com/graphql",
+            json={
+                "query": questionsQuery,
+                "variables": {
+                    "categorySlug": "",
+                    "filters": {},
+                    "limit": 1,
+                    "skip": 0,
+                },
+            },
+        )
+
+        print(questions_response.json())
+
+    def get_by_id(self, question_id: int) -> Question:
+        """
+        Gets a question by its ID.
+        """
+
+        raise NotImplementedError
+
+    def get_by_slug(self, slug: str) -> Question:
+        """
+        Gets a question by its slug.
+        """
+
+        raise NotImplementedError