# teacher_panel.py
from typing import List, Tuple

import gradio as gr  # ⬅️ needed for gr.SelectData type

import qa_store
from qa_store import normalize_question
from loader import (
    generate_new_manual_id,
    save_manual_qa_file,
    rebuild_combined_qa,
    manual_qa_table_data,
)


def _table() -> List[List[str]]:
    return manual_qa_table_data()


def teacher_save_add_overwrite(
    question: str, answer: str, current_id: str
) -> Tuple[str, str, str, List[List[str]], str]:
    """
    Add a new manual Q&A or overwrite existing one
    with the same normalized question.
    """
    question = (question or "").strip()
    answer = (answer or "").strip()
    current_id = current_id or ""

    if not question or not answer:
        msg = "❌ ກະລຸນາໃສ່ທັງຄໍາຖາມແລະຄໍາຕອບ."
        return question, answer, current_id, _table(), msg

    norm_q = normalize_question(question)
    entry = qa_store.MANUAL_QA_INDEX.get(norm_q)

    if entry:
        # overwrite existing manual Q&A
        entry["q"] = question
        entry["a"] = answer
        entry["norm_q"] = norm_q
        current_id = entry["id"]
        msg = "✅ ອັບເດດ Q&A ທີ່ມີຢູ່ແລ້ວ."
    else:
        # create new entry
        new_id = generate_new_manual_id()
        entry = {
            "id": new_id,
            "q": question,
            "a": answer,
            "norm_q": norm_q,
        }
        qa_store.MANUAL_QA_LIST.append(entry)
        qa_store.MANUAL_QA_INDEX[norm_q] = entry
        current_id = new_id
        msg = "✅ ບັນທຶກ Q&A ໃໝ່ສໍາເລັດ."

    save_manual_qa_file()
    rebuild_combined_qa()

    return question, answer, current_id, _table(), msg


def teacher_update_current(
    question: str, answer: str, current_id: str
) -> Tuple[str, str, str, List[List[str]], str]:
    """
    Update the currently selected manual Q&A by id.
    """
    question = (question or "").strip()
    answer = (answer or "").strip()
    current_id = current_id or ""

    if not current_id:
        msg = "❌ ກະລຸນາເລືອກ Q&A ຈາກຕາຕະລາງກ່ອນ."
        return question, answer, current_id, _table(), msg

    if not question or not answer:
        msg = "❌ ກະລຸນາໃສ່ທັງຄໍາຖາມແລະຄໍາຕອບ."
        return question, answer, current_id, _table(), msg

    entry = next((e for e in qa_store.MANUAL_QA_LIST if e["id"] == current_id), None)
    if not entry:
        msg = "⚠️ ບໍ່ພົບ Q&A ທີ່ເລືອກ."
        current_id = ""
        return question, answer, current_id, _table(), msg

    # remove old index
    qa_store.MANUAL_QA_INDEX.pop(entry["norm_q"], None)

    new_norm = normalize_question(question)
    entry["q"] = question
    entry["a"] = answer
    entry["norm_q"] = new_norm
    qa_store.MANUAL_QA_INDEX[new_norm] = entry

    save_manual_qa_file()
    rebuild_combined_qa()

    msg = "✅ ແກ້ໄຂ Q&A ສໍາເລັດ."
    return question, answer, current_id, _table(), msg


def teacher_delete_current(
    current_id: str,
) -> Tuple[str, str, str, List[List[str]], str]:
    """
    Delete the currently selected manual Q&A.
    """
    current_id = current_id or ""

    if not current_id:
        msg = "❌ ກະລຸນາເລືອກ Q&A ກ່ອນຈະລຶບ."
        return "", "", current_id, _table(), msg

    entry = next((e for e in qa_store.MANUAL_QA_LIST if e["id"] == current_id), None)
    if not entry:
        msg = "⚠️ ບໍ່ພົບ Q&A ທີ່ຈະລຶບ."
        return "", "", "", _table(), msg

    qa_store.MANUAL_QA_LIST = [e for e in qa_store.MANUAL_QA_LIST if e["id"] != current_id]
    qa_store.MANUAL_QA_INDEX.pop(entry["norm_q"], None)

    save_manual_qa_file()
    rebuild_combined_qa()

    msg = "🗑️ ລຶບ Q&A ສໍາເລັດ."
    return "", "", "", _table(), msg


def teacher_on_table_select(
    evt: gr.SelectData,
) -> Tuple[str, str, str, str]:
    """
    When teacher clicks a row in the Q&A table, load Q/A into textboxes.

    We only use the SelectData event:
      - evt.index      -> (row, col)
      - evt.row_value  -> the whole row [id, question, answer]
    """
    try:
        if evt is None or evt.index is None or evt.row_value is None:
            raise ValueError("Empty select event")

        # row_value is already the full row (list-like)
        row = list(evt.row_value)

        current_id = str(row[0]) if len(row) > 0 else ""
        question = str(row[1]) if len(row) > 1 else ""
        answer = str(row[2]) if len(row) > 2 else ""

        if not current_id:
            raise ValueError("Empty ID from selected row")

        msg = f"✏️ ເລືອກ Q&A ID {current_id} ສໍາລັບແກ້ໄຂ."
    except Exception as e:  # noqa: BLE001
        print(f"[WARN] teacher_on_table_select error: {e}")
        current_id = ""
        question = ""
        answer = ""
        msg = "⚠️ ບໍ່ສາມາດເລືອກແຖວໄດ້."

    return question, answer, current_id, msg