from __future__ import annotations

import json

import pytest


def test_build_movement_context_detects_new_skill(isolated_output, monkeypatch):
    import daily.config as config
    import daily.delta as delta

    monkeypatch.setattr(config, "OUTPUT_DIR", isolated_output)
    monkeypatch.setattr(delta, "OUTPUT_DIR", isolated_output)

    prev_path = isolated_output / "2026-07-02.data.json"
    prev_path.write_text(
        json.dumps(
            {
                "data": {
                    "date": "2026-07-02",
                    "movement_baseline": {
                        "skills_trending": [{"id": "a/old", "title": "old"}],
                        "skills_hot": [],
                        "github_trending": [],
                        "github_emerging": [],
                        "github_topic": [],
                    },
                }
            },
            ensure_ascii=False,
        ),
        encoding="utf-8",
    )

    trending = [
        {"id": "a/new", "title": "new-skill", "source": "a", "installs": 10, "link": "https://x", "description": ""},
        {"id": "a/old", "title": "old", "source": "a", "installs": 9, "link": "https://y", "description": ""},
    ]
    movement = delta.build_movement_context(
        date_str="2026-07-03",
        trending=trending,
        hot=[],
        github_trending=[],
        github_emerging=[],
        github_topic=[],
    )

    assert movement["baseline_date"] == "2026-07-02"
    assert len(movement["skills_trending_moves"]) == 1
    assert movement["skills_trending_moves"][0]["id"] == "a/new"


def test_find_previous_data_skips_missing_days(isolated_output, monkeypatch):
    import daily.config as config
    import daily.delta as delta

    monkeypatch.setattr(config, "OUTPUT_DIR", isolated_output)
    monkeypatch.setattr(delta, "OUTPUT_DIR", isolated_output)

    (isolated_output / "2026-07-01.data.json").write_text(
        json.dumps({"data": {"date": "2026-07-01", "skills_trending": []}}),
        encoding="utf-8",
    )

    found = delta.find_previous_data("2026-07-03")
    assert found is not None
    assert found[0] == "2026-07-01"