"""Ryugaku - Backyard AI hackathon Gradio app.

Study assistant for international students in Japan.
Tabbed scenes: Translate, Lecture, Sheet, Review.
"""
from __future__ import annotations

import logging
import os
from typing import Any, Dict, List

import gradio as gr

from src.exam_predictor import predict_exam_topics
from src.keyword_extractor import extract_keywords
from src.ocr import ocr_image
from src.summarizer import summarize, easy_english
from src.stt import transcribe_and_translate
from src.translator import translate

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

CUSTOM_CSS = """
#ryu-app {
    height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
}

#ryu-app > .form {
    display: flex;
    flex-direction: column;
    height: 100vh;
    gap: 0;
}

.ryu-header {
    flex: 0 0 auto;
    padding: 8px 16px;
}

.ryu-course label,
.ryu-course .label-wrap {
    display: none !important;
}

.ryu-tabs {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.ryu-tabs .tab-content {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 12px;
}

.ryu-tabs .tab-content .tabitem > .form {
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ryu-pane-row {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    gap: 8px;
}

.ryu-pane-row > .column {
    flex: 1 1 50%;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.ryu-pane-row .block {
    height: 100%;
}

.ryu-toolbar {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 12px;
}

.ryu-hint {
    font-size: 13px;
    padding: 0 8px 8px;
}

.ryu-help {
    border-radius: 8px;
    padding: 12px 16px;
    margin: 0 8px;
}

.ryu-status {
    flex: 0 0 auto;
    padding: 0 16px;
    font-size: 12px;
}

.ryu-center {
    flex: 0 0 auto;
    display: flex;
    justify-content: center;
    padding: 16px;
}

@media (max-width: 768px) {
    .ryu-pane-row {
        flex-direction: column;
    }
}
"""


def _fmt_items(items: List[Dict[str, Any]], mode: str) -> str:
    if not items:
        return ""
    if mode == "keywords":
        return "\n".join(
            f"{it.get('word', '')} ({it.get('reading', '')}) — {it.get('meaning', '')}".strip(" —")
            for it in items[:20]
        )
    if mode == "exam":
        parts = []
        for i, it in enumerate(items[:10], 1):
            body = ""
            if it.get("topic"):
                body += f"Topic: {it['topic']}\n"
            if it.get("question"):
                body += f"Q: {it['question']}\n"
            if it.get("sample_answer"):
                body += f"A: {it['sample_answer']}\n"
            parts.append(f"[{i}]\n{body.strip()}")
        return "\n\n".join(parts)
    return ""


def on_translate(source: str) -> str:
    if not source.strip():
        return ""
    out, _ = translate(source)
    return out


def on_summarize(source: str) -> str:
    if not source.strip():
        return ""
    out, _ = summarize(source)
    return out


def on_easy(source: str) -> str:
    if not source.strip():
        return ""
    out, _ = easy_english(source)
    return out


def on_keywords(source: str) -> str:
    if not source.strip():
        return ""
    items, _ = extract_keywords(source)
    return _fmt_items(items, "keywords")


def on_exam(source: str) -> str:
    if not source.strip():
        return ""
    items, _ = predict_exam_topics(source)
    return _fmt_items(items, "exam")


def on_audio(audio_path: str):
    transcript, translation, status = transcribe_and_translate(audio_path)
    return transcript, translation, status or ""


def on_image(image):
    if image is None:
        return "", "", ""
    detected, translated = ocr_image(image)
    if detected.startswith("OCR error:") or detected == "(no text detected)":
        return "", "", detected
    return detected, translated, ""


def add_course(name: str, courses: List[Dict[str, Any]]):
    if not name or not name.strip():
        return courses, None, ""
    new_id = str(max([int(c["id"]) for c in courses], default=0) + 1)
    courses.append({"id": new_id, "name": name.strip()})
    return courses, new_id, f"コース「{name.strip()}」を追加しました。"


def update_dropdown(courses: List[Dict[str, Any]]):
    return gr.Dropdown(choices={c["name"]: c["id"] for c in courses}, value=courses[-1]["id"] if courses else None)


def show_help():
    return (
        "【使い方】\n"
        "• 翻訳：日本語を入力すると自動で英語に翻訳します。\n"
        "• 音声：マイクボタンを押して話してください。録音停止後に日本語の文字起こしと英訳が表示されます。\n"
        "• 画像翻訳：画像をドラッグ＆ドロップまたはクリックしてアップロードすると、写っている日本語を読み取って英訳します。\n"
        "• 復習：授業のテキストを貼り付けて、下のボタンから要約・かんたん英語・単語帳・試験予測を生成します。\n"
        "• コース：ヘッダーの「新しいコース名」に入力して「追加」を押すと、翻訳履歴を分けて管理するコースを作れます。"
    )


def toggle_help(visible: bool):
    return not visible, gr.update(visible=not visible)


with gr.Blocks(
    title="Ryugaku",
    elem_id="ryu-app",
    css=CUSTOM_CSS,
    theme=gr.themes.Default(),
) as demo:
    courses_state = gr.State(value=[{"id": "1", "name": "デフォルト"}])

    with gr.Row(elem_classes=["ryu-header"]):
        gr.Markdown("## Ryugaku")
        with gr.Row(elem_classes=["ryu-course"]):
            gr.Markdown("コース：")
            course_dropdown = gr.Dropdown(
                label="",
                choices={"デフォルト": "1"},
                value="1",
                show_label=False,
                container=False,
                interactive=True,
                scale=1,
                allow_custom_value=True,
            )
            new_course_name = gr.Textbox(
                label="",
                placeholder="新しいコース名",
                show_label=False,
                container=False,
                scale=1,
            )
            add_course_btn = gr.Button("追加", scale=0)
            help_visible = gr.State(False)
            help_btn = gr.Button("？ 使い方", scale=0)

    help_text = gr.Textbox(
        label="",
        value=show_help(),
        interactive=False,
        show_label=False,
        container=False,
        lines=6,
        visible=False,
        elem_classes=["ryu-help"],
    )

    with gr.Tabs(elem_classes=["ryu-tabs"]):
        with gr.Tab("翻訳 / Translate"):
            gr.Markdown(
                '<div class="ryu-hint">日本語を入力すると、右側に英語訳が表示されます。</div>'
            )
            with gr.Row(elem_classes=["ryu-pane-row"]):
                translate_source = gr.Textbox(
                    label="日本語",
                    placeholder="ここに日本語を入力または貼り付け...",
                    lines=18,
                    show_label=True,
                    container=True,
                    scale=1,
                )
                translate_output = gr.Textbox(
                    label="English",
                    placeholder="English translation will appear here...",
                    interactive=False,
                    lines=18,
                    show_label=True,
                    container=True,
                    scale=1,
                )

            with gr.Row(elem_classes=["ryu-toolbar"]):
                translate_btn = gr.Button("翻訳", variant="primary")
                clear_translate_btn = gr.Button("クリア")

            with gr.Row(elem_classes=["ryu-status"]):
                translate_status = gr.Textbox(
                    label="",
                    interactive=False,
                    show_label=False,
                    container=False,
                    value="",
                )

        with gr.Tab("音声 / Lecture"):
            gr.Markdown(
                '<div class="ryu-hint">マイクボタンを押して話してください。録音停止後に文字起こしと英訳が表示されます。</div>'
            )
            with gr.Row(elem_classes=["ryu-center"]):
                lecture_audio = gr.Audio(
                    sources=["microphone"],
                    type="filepath",
                    label="マイクで録音",
                    show_label=True,
                )

            with gr.Row(elem_classes=["ryu-pane-row"]):
                lecture_ja = gr.Textbox(
                    label="文字起こし（日本語）",
                    placeholder="ここに日本語の文字起こしが表示されます...",
                    lines=12,
                    show_label=True,
                    container=True,
                    scale=1,
                )
                lecture_en = gr.Textbox(
                    label="翻訳（English）",
                    placeholder="English translation will appear here...",
                    interactive=False,
                    lines=12,
                    show_label=True,
                    container=True,
                    scale=1,
                )

            with gr.Row(elem_classes=["ryu-status"]):
                lecture_status = gr.Textbox(
                    label="",
                    interactive=False,
                    show_label=False,
                    container=False,
                    value="",
                )

        with gr.Tab("画像翻訳 / Sheet"):
            gr.Markdown(
                '<div class="ryu-hint">画像をドラッグ＆ドロップするか、枠内をクリックしてアップロードしてください。写っている日本語を読み取って英訳します。</div>'
            )
            with gr.Row(elem_classes=["ryu-center"]):
                sheet_image = gr.Image(
                    type="pil",
                    label="画像をアップロード",
                    show_label=True,
                    sources=["upload"],
                )

            with gr.Row(elem_classes=["ryu-pane-row"]):
                sheet_ja = gr.Textbox(
                    label="読み取った日本語",
                    placeholder="ここにOCRで読み取った日本語が表示されます...",
                    lines=12,
                    show_label=True,
                    container=True,
                    scale=1,
                )
                sheet_en = gr.Textbox(
                    label="翻訳（English）",
                    placeholder="English translation will appear here...",
                    interactive=False,
                    lines=12,
                    show_label=True,
                    container=True,
                    scale=1,
                )

            with gr.Row(elem_classes=["ryu-status"]):
                sheet_status = gr.Textbox(
                    label="",
                    interactive=False,
                    show_label=False,
                    container=False,
                    value="",
                )

        with gr.Tab("復習 / Review"):
            gr.Markdown(
                '<div class="ryu-hint">授業のテキストを貼り付けて、下のボタンから復習コンテンツを生成してください。</div>'
            )
            with gr.Row(elem_classes=["ryu-review-input"]):
                review_text = gr.Textbox(
                    label="授業のテキスト",
                    placeholder="ここに授業の原稿やノートを貼り付け...",
                    lines=8,
                    show_label=True,
                    container=True,
                    scale=1,
                )

            with gr.Row(elem_classes=["ryu-toolbar"]):
                summary_btn = gr.Button("要約")
                easy_btn = gr.Button("かんたん英語")
                keywords_btn = gr.Button("単語帳")
                exam_btn = gr.Button("試験予測")
                clear_review_btn = gr.Button("クリア")

            with gr.Row(elem_classes=["ryu-result"]):
                review_output = gr.Textbox(
                    label="結果",
                    lines=10,
                    interactive=False,
                    show_label=True,
                    container=True,
                    placeholder="ここに要約・かんたん英語・単語帳・試験予測が表示されます...",
                )

    # Events
    translate_source.change(fn=on_translate, inputs=translate_source, outputs=translate_output)
    translate_btn.click(fn=on_translate, inputs=translate_source, outputs=translate_output)
    clear_translate_btn.click(
        fn=lambda: ("", ""),
        outputs=[translate_source, translate_output],
    )

    lecture_audio.change(
        fn=on_audio,
        inputs=lecture_audio,
        outputs=[lecture_ja, lecture_en, lecture_status],
    )

    sheet_image.change(
        fn=on_image,
        inputs=sheet_image,
        outputs=[sheet_ja, sheet_en, sheet_status],
    )

    summary_btn.click(fn=on_summarize, inputs=review_text, outputs=review_output)
    easy_btn.click(fn=on_easy, inputs=review_text, outputs=review_output)
    keywords_btn.click(fn=on_keywords, inputs=review_text, outputs=review_output)
    exam_btn.click(fn=on_exam, inputs=review_text, outputs=review_output)
    clear_review_btn.click(
        fn=lambda: ("", ""),
        outputs=[review_text, review_output],
    )

    add_course_btn.click(
        fn=add_course,
        inputs=[new_course_name, courses_state],
        outputs=[courses_state, course_dropdown, translate_status],
    ).then(
        fn=update_dropdown,
        inputs=courses_state,
        outputs=course_dropdown,
    )

    help_btn.click(
        fn=toggle_help,
        inputs=help_visible,
        outputs=[help_visible, help_text],
    )

if __name__ == "__main__":
    port = int(os.environ.get("PORT", "7860"))
    demo.launch(server_name="0.0.0.0", server_port=port)