src/streamlit_app.py

# streamlit_app.py
import json, random, streamlit as st
from pathlib import Path

DATA_FILE = Path(__file__).parent / "master_fundamentos_evaluado.json"

@st.cache_data
def load_data(path):
    with open(path, encoding="utf-8") as f:
        return json.load(f)

data = load_data(DATA_FILE)

# ───────── Helpers ─────────
def random_question():
    return random.choice(data["preguntas"])

def random_case():
    return random.choice(data["casos_clinicos"])

def build_exam():
    preguntas = random.sample(data["preguntas"], 25)
    casos = random.sample(data["casos_clinicos"], 2)
    items = [{"grupo": "normal", "data": q} for q in preguntas]
    for c in casos:
        for q in c["preguntas"]:
            items.append({
                "grupo": c["id"],
                "data": {**q, "caso": c["titulo"], "context": c["contexto"]}
            })
    return items

# ───────── Estado inicial ─────────
if "mode" not in st.session_state:
    st.session_state.mode = "preguntas"
    st.session_state.question = random_question()
    st.session_state.case_list = []
    st.session_state.case_idx = 0
    st.session_state.exam_items = []
    st.session_state.exam_idx = 0
    st.session_state.hits_norm = 0
    st.session_state.hits_case = {}
    st.session_state.total_case = {}
    st.session_state.recorrido_idx = 0  # nuevo

# ───────── Barra lateral ─────────
st.sidebar.title("Fundamentos")

if st.sidebar.button("Preguntas sueltas"):
    st.session_state.mode = "preguntas"
    st.session_state.question = random_question()
    st.rerun()

if st.sidebar.button("Casos clínicos"):
    st.session_state.mode = "caso"
    caso = random_case()
    st.session_state.case_list = [
        {**q, "caso": caso["titulo"], "context": caso["contexto"]}
        for q in caso["preguntas"]
    ]
    st.session_state.case_idx = 0
    st.session_state.question = st.session_state.case_list[0]
    st.rerun()

if st.sidebar.button("Examen (25 + 2 casos)"):
    st.session_state.mode = "examen"
    st.session_state.exam_items = build_exam()
    st.session_state.exam_idx = 0
    st.session_state.hits_norm = 0
    st.session_state.hits_case.clear()
    st.session_state.total_case = {}
    for it in st.session_state.exam_items:
        if it["grupo"] != "normal":
            st.session_state.total_case[it["grupo"]] = \
                st.session_state.total_case.get(it["grupo"], 0) + 1
    st.session_state.question = st.session_state.exam_items[0]["data"]
    st.rerun()

if st.sidebar.button("Recorrido completo"):
    st.session_state.mode = "recorrido"
    st.session_state.recorrido_idx = 0
    st.session_state.question = data["preguntas"][0]
    st.rerun()

st.sidebar.markdown("---")
st.sidebar.markdown("Creado con ❤️ por Requetito")

# ───────── Encabezado: modo + progreso ─────────
mode_label = {
    "preguntas": "Práctica – Preguntas sueltas",
    "caso": "Práctica – Casos clínicos",
    "examen": "Examen final",
    "recorrido": "Recorrido completo – Todas las preguntas"
}

st.subheader(mode_label[st.session_state.mode])

progreso = ""
if st.session_state.mode == "examen":
    progreso = f"{st.session_state.exam_idx + 1} / {len(st.session_state.exam_items)}"
elif st.session_state.mode == "caso":
    progreso = f"{st.session_state.case_idx + 1} / {len(st.session_state.case_list)}"
elif st.session_state.mode == "recorrido":
    total = len(data["preguntas"])
    idx = st.session_state.recorrido_idx
    progreso = f"{idx + 1} / {total}"
    st.caption(progreso)
    nuevo_idx = st.number_input("Ir a la pregunta n.º:", min_value=1, max_value=total, value=idx + 1, step=1)
    if nuevo_idx - 1 != idx:
        st.session_state.recorrido_idx = nuevo_idx - 1
        st.session_state.question = data["preguntas"][nuevo_idx - 1]
        st.rerun()

if progreso and st.session_state.mode != "recorrido":
    st.caption(progreso)

# ───────── Pregunta ─────────
q = st.session_state.question

if "context" in q:
    st.info(f"**CONTEXTO ({q['caso']})**\n\n{q['context']}")
st.markdown(f"### {q['pregunta']}")

selected = st.radio(
    "Elige una respuesta:",
    options=list(q["opciones"].keys()),
    format_func=lambda k: f"{k}. {q['opciones'][k]}",
    index=None,
    key=f"radio_{q['id']}_{st.session_state.mode}"
)

col1, col2 = st.columns(2)
comprobar = col1.button("✅ Comprobar")
siguiente = col2.button("➡️ Siguiente")

# contenedores feedback
feedback_box = st.empty()
justif_box = st.empty()

# ───────── Comprobar ─────────
if comprobar and selected:
    correcta = q["respuesta_correcta"]
    ok = selected == correcta
    if ok:
        feedback_box.success("✅ ¡Correcto!")
    else:
        feedback_box.error(f"❌ Incorrecto. La respuesta correcta era **{correcta}**.")
    justif_box.markdown(f"**Justificación:**\n{q['justificacion']}")

    if st.session_state.mode == "examen":
        grp = st.session_state.exam_items[st.session_state.exam_idx]["grupo"]
        if grp == "normal" and ok:
            st.session_state.hits_norm += 1
        elif grp != "normal" and ok:
            st.session_state.hits_case[grp] = \
                st.session_state.hits_case.get(grp, 0) + 1

# ───────── Siguiente ─────────
if siguiente:
    feedback_box.empty(); justif_box.empty()

    if st.session_state.mode == "preguntas":
        st.session_state.question = random_question()

    elif st.session_state.mode == "caso":
        st.session_state.case_idx += 1
        if st.session_state.case_idx == len(st.session_state.case_list):
            caso = random_case()
            st.session_state.case_list = [
                {**q, "caso": caso["titulo"], "context": caso["contexto"]}
                for q in caso["preguntas"]
            ]
            st.session_state.case_idx = 0
        st.session_state.question = st.session_state.case_list[st.session_state.case_idx]

    elif st.session_state.mode == "examen":
        st.session_state.exam_idx += 1
        if st.session_state.exam_idx == len(st.session_state.exam_items):
            pts_preg = st.session_state.hits_norm * (4 / 25)
            pts_casos = 0
            detalles = []

            for cid, tot in st.session_state.total_case.items():
                peso_por_preg = 6 / tot
                aciertos = st.session_state.hits_case.get(cid, 0)
                pts = aciertos * peso_por_preg
                pts_casos += pts
                detalles.append(f"{cid}: {pts:.2f} / 6")

            total = pts_preg + pts_casos
            aprobado = total >= 7.5
            st.balloons()
            st.markdown(
                f"## 🏁 Examen finalizado\n\n"
                f"**Preguntas (máx 4):** {pts_preg:.2f}\n\n"
                + "\n".join(detalles) +
                f"\n\n**TOTAL:** {total:.2f} / 16  →  "
                + ("✅ Aprobado" if aprobado else "❌ No aprobado")
            )
            st.stop()

        st.session_state.question = \
            st.session_state.exam_items[st.session_state.exam_idx]["data"]

    elif st.session_state.mode == "recorrido":
        st.session_state.recorrido_idx += 1
        if st.session_state.recorrido_idx >= len(data["preguntas"]):
            st.session_state.recorrido_idx = 0
        st.session_state.question = data["preguntas"][st.session_state.recorrido_idx]

    st.rerun()