feat: add where are more items problem

AGENTS.md

@@ -55,8 +55,8 @@ For a new grade, follow the same pattern:
 
 ## Naming Conventions
 
-- Endpoint paths use the existing style: `/math/1_grade/<problem_name>`.
-- Python package names should use valid identifiers like `grade_1`, not `1_grade`.
+- Endpoint paths use the existing style: `/math/grade_1/<problem_name>`.
+- Python package names should use valid identifiers like `grade_1`.
 - Problem files should use snake case, for example `join_pictures_with_quantity.py`.
 - Request schema names should end in `Request`.
 - Response schema names should describe the generated problem, for example `JoinPicturesWithQuantityProblem`.

ENDPOINTS-EXAMPLE.md

@@ -0,0 +1,51 @@
+# Endpoints examples
+
+Test quick examples for each endpoint:
+
+## Grade 1
+
+### Join pictures with quantity
+
+```bash
+curl -X POST "http://127.0.0.1:8000/math/grade_1/join_pictures_with_quantity" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "available_pictures": [
+      {"id": "picture-1", "name": "Apple", "image_path": "/images/apple.png"},
+      {"id": "picture-2", "name": "Banana", "image_path": "/images/banana.png"},
+      {"id": "picture-3", "name": "Car", "image_path": "/images/car.png"},
+      {"id": "picture-4", "name": "Dog", "image_path": "/images/dog.png"},
+      {"id": "picture-5", "name": "Elephant", "image_path": "/images/elephant.png"},
+      {"id": "picture-6", "name": "Fish", "image_path": "/images/fish.png"},
+      {"id": "picture-7", "name": "Grape", "image_path": "/images/grape.png"},
+      {"id": "picture-8", "name": "Hat", "image_path": "/images/hat.png"},
+      {"id": "picture-9", "name": "Ice Cream", "image_path": "/images/ice-cream.png"},
+      {"id": "picture-10", "name": "Juice", "image_path": "/images/juice.png"}
+    ],
+    "container_count_per_side": 5,
+    "min_quantity": 1,
+    "max_quantity": 10,
+    "seed": 1
+  }'
+```
+
+### Where are more items
+
+```bash
+curl -X POST "http://127.0.0.1:8000/math/grade_1/where_are_more_items" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "available_pictures": [
+      {"id": "picture-1", "name": "Panda", "image_path": "/images/panda.png"},
+      {"id": "picture-2", "name": "Koala", "image_path": "/images/koala.png"},
+      {"id": "picture-3", "name": "Orange", "image_path": "/images/orange.png"},
+      {"id": "picture-4", "name": "Apple", "image_path": "/images/apple.png"},
+      {"id": "picture-5", "name": "Donut", "image_path": "/images/donut.png"},
+      {"id": "picture-6", "name": "Candy", "image_path": "/images/candy.png"}
+    ],
+    "comparison_count": 3,
+    "min_quantity": 1,
+    "max_quantity": 10,
+    "seed": 1
+  }'
+```

app/problems/grade_1/where_are_more_items.py

@@ -0,0 +1,55 @@
+import random
+
+from app.schemas.grade_1.where_are_more_items import (
+    ItemGroup,
+    MoreItemsComparison,
+    PictureAsset,
+    WhereAreMoreItemsProblem,
+)
+
+
+def where_are_more_items(
+    available_pictures: list[dict],
+    comparison_count: int = 3,
+    min_quantity: int = 1,
+    max_quantity: int = 10,
+    seed: int | None = None,
+) -> dict:
+    """Generate comparison cards where students choose the group with more items."""
+    pictures = [PictureAsset.model_validate(picture) for picture in available_pictures]
+
+    if len(pictures) < 2:
+        raise ValueError("available_pictures must contain at least 2 pictures")
+
+    if min_quantity >= max_quantity:
+        raise ValueError("max_quantity must be greater than min_quantity")
+
+    rng = random.Random(seed)
+    quantity_values = list(range(min_quantity, max_quantity + 1))
+    comparisons: list[MoreItemsComparison] = []
+
+    for index in range(comparison_count):
+        left_picture, right_picture = rng.sample(pictures, 2)
+        left_quantity, right_quantity = rng.sample(quantity_values, 2)
+        answer_side = "left" if left_quantity > right_quantity else "right"
+
+        comparisons.append(
+            MoreItemsComparison(
+                position=index + 1,
+                left_group=ItemGroup(
+                    side="left",
+                    picture=left_picture,
+                    quantity=left_quantity,
+                ),
+                right_group=ItemGroup(
+                    side="right",
+                    picture=right_picture,
+                    quantity=right_quantity,
+                ),
+                answer_side=answer_side,
+            )
+        )
+
+    problem = WhereAreMoreItemsProblem(comparisons=comparisons)
+
+    return problem.model_dump()

app/routers/grade_1.py

@@ -3,10 +3,15 @@ from fastapi import APIRouter, HTTPException
 from app.problems.grade_1.join_pictures_with_quantity import (
     join_pictures_with_quantity,
 )
+from app.problems.grade_1.where_are_more_items import where_are_more_items
 from app.schemas.grade_1.join_pictures_with_quantity import (
     JoinPicturesWithQuantityProblem,
     JoinPicturesWithQuantityRequest,
 )
+from app.schemas.grade_1.where_are_more_items import (
+    WhereAreMoreItemsProblem,
+    WhereAreMoreItemsRequest,
+)
 
 router = APIRouter(prefix="/grade_1", tags=["Grade 1"])
 
@@ -30,3 +35,24 @@ def create_join_pictures_with_quantity_problem(
         )
     except ValueError as exc:
         raise HTTPException(status_code=400, detail=str(exc)) from exc
+
+
+@router.post(
+    "/where_are_more_items",
+    response_model=WhereAreMoreItemsProblem,
+)
+def create_where_are_more_items_problem(
+    request: WhereAreMoreItemsRequest,
+) -> dict:
+    try:
+        return where_are_more_items(
+            available_pictures=[
+                picture.model_dump() for picture in request.available_pictures
+            ],
+            comparison_count=request.comparison_count,
+            min_quantity=request.min_quantity,
+            max_quantity=request.max_quantity,
+            seed=request.seed,
+        )
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc)) from exc

app/schemas/grade_1/where_are_more_items.py

@@ -0,0 +1,36 @@
+from typing import Literal
+
+from pydantic import BaseModel, Field, PositiveInt
+
+
+class PictureAsset(BaseModel):
+    id: str = Field(min_length=1)
+    name: str = Field(min_length=1)
+    image_path: str = Field(min_length=1)
+
+
+class ItemGroup(BaseModel):
+    side: Literal["left", "right"]
+    picture: PictureAsset
+    quantity: PositiveInt
+
+
+class MoreItemsComparison(BaseModel):
+    position: PositiveInt
+    left_group: ItemGroup
+    right_group: ItemGroup
+    answer_side: Literal["left", "right"]
+    has_answer_box: bool = True
+
+
+class WhereAreMoreItemsProblem(BaseModel):
+    instructions: str = "Marca dónde hay más."
+    comparisons: list[MoreItemsComparison]
+
+
+class WhereAreMoreItemsRequest(BaseModel):
+    available_pictures: list[PictureAsset] = Field(min_length=1)
+    comparison_count: PositiveInt = 3
+    min_quantity: PositiveInt = 1
+    max_quantity: PositiveInt = 10
+    seed: int | None = None

tests/test_join_pictures_with_quantity_endpoint.py

@@ -11,7 +11,7 @@ class JoinPicturesWithQuantityEndpointTest(unittest.TestCase):
 
     def test_creates_problem(self) -> None:
         response = self.client.post(
-            "/math/1_grade/join_pictures_with_quantity",
+            "/math/grade_1/join_pictures_with_quantity",
             json={
                 "available_pictures": [
                     {
@@ -37,7 +37,7 @@ class JoinPicturesWithQuantityEndpointTest(unittest.TestCase):
 
     def test_returns_bad_request_for_too_few_pictures(self) -> None:
         response = self.client.post(
-            "/math/1_grade/join_pictures_with_quantity",
+            "/math/grade_1/join_pictures_with_quantity",
             json={
                 "available_pictures": [
                     {

tests/test_where_are_more_items_endpoint.py

@@ -0,0 +1,72 @@
+import unittest
+
+from fastapi.testclient import TestClient
+
+from app.main import create_app
+
+
+class WhereAreMoreItemsEndpointTest(unittest.TestCase):
+    def setUp(self) -> None:
+        self.client = TestClient(create_app())
+
+    def test_creates_problem(self) -> None:
+        response = self.client.post(
+            "/math/grade_1/where_are_more_items",
+            json={
+                "available_pictures": [
+                    {
+                        "id": f"picture-{index}",
+                        "name": f"Picture {index}",
+                        "image_path": f"/images/{index}.png",
+                    }
+                    for index in range(6)
+                ],
+                "seed": 1,
+            },
+        )
+
+        self.assertEqual(response.status_code, 200)
+        problem = response.json()
+        self.assertEqual(problem["instructions"], "Marca dónde hay más.")
+        self.assertEqual(len(problem["comparisons"]), 3)
+
+        for comparison in problem["comparisons"]:
+            left_group = comparison["left_group"]
+            right_group = comparison["right_group"]
+
+            self.assertEqual(left_group["side"], "left")
+            self.assertEqual(right_group["side"], "right")
+            self.assertNotEqual(left_group["quantity"], right_group["quantity"])
+            self.assertIn("picture", left_group)
+            self.assertIn("picture", right_group)
+
+            expected_answer_side = (
+                "left"
+                if left_group["quantity"] > right_group["quantity"]
+                else "right"
+            )
+            self.assertEqual(comparison["answer_side"], expected_answer_side)
+
+    def test_returns_bad_request_for_too_few_figures(self) -> None:
+        response = self.client.post(
+            "/math/grade_1/where_are_more_items",
+            json={
+                "available_pictures": [
+                    {
+                        "id": "picture-1",
+                        "name": "Picture 1",
+                        "image_path": "/images/1.png",
+                    }
+                ]
+            },
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(
+            response.json(),
+            {"detail": "available_pictures must contain at least 2 pictures"},
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()