# gallery.py
# -*- coding: utf-8 -*-
import os
from pathlib import Path
import streamlit as st

# ===== Config: suporta pasta 'Config' (maiúscula) e 'config' (minúscula) =====
try:
    from Config.settings import PAGE_SIZE_DEFAULT
except Exception:
    try:
        from config.settings import PAGE_SIZE_DEFAULT
    except Exception:
        PAGE_SIZE_DEFAULT = 12  # fallback seguro

# ===== Storage da galeria: tenta 'core.gallery_storage' e, se não houver 'core/', usa raiz =====
try:
    from core.gallery_storage import (
        save_report_image,
        gallery_list_images_sorted,
        delete_report_image,
    )
except Exception:
    from gallery_storage import (
        save_report_image,
        gallery_list_images_sorted,
        delete_report_image,
    )


def render_reports_gallery_uploader(key_prefix: str) -> None:
    """Uploader de imagens para a galeria (qualquer usuário)."""
    st.subheader("📤 Publicar foto do relatório")
    st.caption("Envie uma imagem (JPG/PNG/WEBP). Todos os usuários poderão visualizar na galeria.")

    uploader_name = ""
    uploader_email = ""
    if st.session_state.get("aluno_logged_in"):
        uploader_name = st.session_state.get("aluno_nome") or ""
        uploader_email = st.session_state.get("aluno_email") or ""
    elif st.session_state.get("is_admin"):
        uploader_name = st.session_state.get("admin_user") or ""

    col_name, _ = st.columns([2, 3])
    name_input = col_name.text_input(
        "Seu nome (opcional)",
        value=uploader_name,
        max_chars=40,
        placeholder="Ex.: Rodrigo",
        key=f"{key_prefix}gallery_name_input",
    )

    up = st.file_uploader(
        "Selecione a imagem do relatório",
        type=["png", "jpg", "jpeg", "webp"],
        accept_multiple_files=False,
        help="Dica: até ~5MB carrega mais rápido",
        key=f"{key_prefix}gallery_file_uploader",
    )

    if up:
        try:
            st.image(up, caption="Pré-visualização", use_container_width=True)
        except Exception:
            st.info("Pré-visualização indisponível para este arquivo.")

    publish_col, _ = st.columns([1, 3])
    if publish_col.button(
        "📌 Publicar",
        type="primary",
        use_container_width=True,
        disabled=(up is None),
        key=f"{key_prefix}gallery_publish_btn",
    ):
        if up is None:
            st.warning("Selecione uma imagem antes de publicar.")
            return
        try:
            saved = save_report_image(
                uploaded_file=up,
                uploader_name=(name_input or None),
                uploader_email=(uploader_email or None),
            )
            if saved:
                st.success("Imagem publicada com sucesso!")
                st.rerun()
        except Exception as e:
            st.error(f"Falha ao salvar imagem: {e}")


def render_reports_gallery_grid(page_size: int = PAGE_SIZE_DEFAULT, key_prefix: str = "") -> None:
    """Grade com miniaturas + download; exclusão apenas para Admin (server-side check)."""
    st.subheader("🖼️ Galeria de Relatórios")
    imgs = gallery_list_images_sorted()
    if not imgs:
        st.info("Ainda não há imagens publicadas.")
        return

    import math

    total = len(imgs)
    pages = max(1, math.ceil(total / page_size))

    key_page = f"{key_prefix}gallery_page"
    st.session_state.setdefault(key_page, 1)

    cur_page = st.session_state[key_page]
    if cur_page > pages:
        cur_page = pages
        st.session_state[key_page] = cur_page
    if cur_page < 1:
        cur_page = 1
        st.session_state[key_page] = cur_page

    col_left, col_center, col_right = st.columns([1, 3, 1])
    with col_left:
        if st.button("⬅️", disabled=(cur_page <= 1), key=f"{key_prefix}gallery_nav_prev"):
            st.session_state[key_page] = max(1, cur_page - 1)
            st.rerun()
    with col_center:
        sel = st.selectbox(
            "Página",
            options=list(range(1, pages + 1)),
            index=cur_page - 1,
            key=f"{key_prefix}gallery_page_select",
            label_visibility="collapsed",
        )
        if sel != cur_page:
            st.session_state[key_page] = sel
            st.rerun()
    with col_right:
        if st.button("➡️", disabled=(cur_page >= pages), key=f"{key_prefix}gallery_nav_next"):
            st.session_state[key_page] = min(pages, cur_page + 1)
            st.rerun()

    st.caption(
        f"Mostrando {page_size} por página — {total} imagens no total · "
        f"Página {st.session_state.get(key_page, 1)} de {pages}"
    )

    start = (st.session_state[key_page] - 1) * page_size
    end = min(start + page_size, total)
    page_items = imgs[start:end]

    cols = st.columns(3)
    is_admin = bool(st.session_state.get("is_admin"))

    for i, (name, mtime, orig_path, thumb_path) in enumerate(page_items):
        col = cols[i % 3]
        with col:
            try:
                if Path(thumb_path).exists():
                    col.image(str(thumb_path), use_container_width=True, caption=name)
                else:
                    col.image(str(orig_path), use_container_width=True, caption=name)
            except Exception:
                col.warning(f"Não foi possível carregar {name}.")
                continue

            # Download do original
            try:
                with open(orig_path, "rb") as f:
                    mime = "image/jpeg" if name.lower().endswith((".jpg", ".jpeg")) else "image/png"
                    st.download_button(
                        label="⬇️ Baixar original",
                        data=f,
                        file_name=name,
                        mime=mime,
                        use_container_width=True,
                        key=f"{key_prefix}dl_{name}",
                    )
            except Exception as e:
                col.warning(f"Download indisponível: {e}")

            # Exclusão — somente Admin (verificação também no servidor)
            if is_admin:
                if st.button("🗑️ Remover", key=f"{key_prefix}rm_{name}", type="secondary", use_container_width=True):
                    try:
                        delete_report_image(filename=name, is_admin=True)
                        st.success("Imagem removida.")
                        st.rerun()
                    except PermissionError as e:
                        st.error(str(e))
                    except Exception as e:
                        st.error(f"Erro ao remover: {e}")
            else:
                st.caption("Somente Admin pode excluir.")


def aba_galeria_relatorios(context_key: str) -> None:
    """Aba completa: upload + grid (keys isoladas por contexto)."""
    with st.container(border=True):
        render_reports_gallery_uploader(key_prefix=context_key)
    st.divider()
    render_reports_gallery_grid(page_size=PAGE_SIZE_DEFAULT, key_prefix=context_key)