from __future__ import annotations

import csv
import json
import shutil
import tempfile
import uuid
from pathlib import Path

import gradio as gr
import yaml

from bat_tracker.pipeline import run_pipeline


APP_VERSION = "v1.1.7"
APP_TITLE = f"Bat Tracker {APP_VERSION}"
APP_DESCRIPTION = (
    "Sube un video IR monocromo para ejecutar el pipeline, revisar la region valida "
    "detectada y consultar `events.csv` en forma de tabla."
)
DEFAULT_CONFIG_PATH = Path(__file__).resolve().parent / "config.out3_clean.yaml"

# Vídeos públicos del bucket HF: URL `resolve` sin rama `main` (con `main` devuelve 404).
EXAMPLE_VIDEO_RABELLA = (
    "https://huggingface.co/buckets/kerojohan/tests_videos/"
    "resolve/rabella_20211016_DSCF0005_ttdata/rabella_20211016_DSCF0005.mp4"
)
EXAMPLE_VIDEO_PROVAGRAN2 = (
    "https://huggingface.co/buckets/kerojohan/tests_videos/"
    "resolve/PROVAGRAN2/2023_0919_211201_006.MOV"
)


def _format_duration_hms(seconds: float) -> str:
    """Duración en texto a partir de segundos (metadatos del vídeo original)."""
    total = int(round(seconds))
    h, rest = divmod(total, 3600)
    m, s = divmod(rest, 60)
    if h > 0:
        return f"{h} h {m} min {s} s"
    if m > 0:
        return f"{m} min {s} s"
    return f"{s} s"


# Pesos según la ficha del bucket HF; duraciones comprobadas con ffprobe sobre la URL resolve.
EXAMPLE_VIDEO_ROWS: list[tuple[str, str, str, str]] = [
    (
        EXAMPLE_VIDEO_RABELLA,
        EXAMPLE_VIDEO_RABELLA,
        "39,3 MB",
        _format_duration_hms(60.095667),
    ),
    (
        EXAMPLE_VIDEO_PROVAGRAN2,
        EXAMPLE_VIDEO_PROVAGRAN2,
        "862 MB",
        _format_duration_hms(600.0),
    ),
]
def _prepare_config(config_file: str | None, work_dir: Path) -> Path:
    source_path = Path(config_file) if config_file else DEFAULT_CONFIG_PATH
    if not source_path.exists():
        raise FileNotFoundError(f"No se encuentra el archivo de configuración: {source_path}")

    with source_path.open("r", encoding="utf-8") as handle:
        cfg = yaml.safe_load(handle) or {}
    if not isinstance(cfg, dict):
        raise ValueError("La configuración debe ser un YAML con estructura de diccionario")

    cfg.setdefault("output", {})
    cfg["output"]["progress_enabled"] = True
    cfg["output"]["progress_step_percent"] = 2

    config_path = work_dir / "space_config.yaml"
    with config_path.open("w", encoding="utf-8") as handle:
        yaml.safe_dump(cfg, handle, sort_keys=False, allow_unicode=True)
    return config_path


def _read_csv_table(path: Path) -> tuple[list[str], list[list[str]]]:
    with path.open("r", encoding="utf-8", newline="") as handle:
        reader = csv.reader(handle)
        rows = list(reader)

    if not rows:
        return [], []
    return rows[0], rows[1:]


def _copy_input_file(src: str, dst_dir: Path) -> Path:
    src_path = Path(src)
    safe_name = src_path.name or "input_video.mp4"
    dst_path = dst_dir / safe_name
    shutil.copy2(src_path, dst_path)
    return dst_path


def process_video(video_file: str | None, config_file: str | None, progress=gr.Progress()):
    if not video_file:
        raise gr.Error("Debes subir un video de entrada.")

    session_root = Path(tempfile.gettempdir()) / "bat_tracker_spaces"
    session_root.mkdir(parents=True, exist_ok=True)

    work_dir = session_root / uuid.uuid4().hex
    output_dir = work_dir / "output"
    work_dir.mkdir(parents=True, exist_ok=True)

    try:
        progress(0, desc="Preparando ejecución")
        input_path = _copy_input_file(video_file, work_dir)
        config_path = _prepare_config(config_file, work_dir)

        def on_pipeline_progress(pct: int, detail: str | None) -> None:
            description = detail or "Procesando"
            progress(min(max(pct / 100.0, 0.0), 1.0), desc=description)

        progress(0.05, desc="Ejecutando pipeline")
        meta = run_pipeline(
            input_video=str(input_path),
            output_dir=str(output_dir),
            config_path=str(config_path),
            progress_callback=on_pipeline_progress,
        )
        progress(1.0, desc="Resultados listos")

        outputs = meta.get("outputs", {})
        events_csv = Path(outputs["events_csv"])
        headers, rows = _read_csv_table(events_csv)
        table_headers = headers or ["Sin resultados"]
        table_value = rows if headers else []

        valid_region_overlay = outputs.get("valid_region_overlay_png")
        tracks_overlay = outputs.get("tracks_overlay_png")

        summary = {
            "video_id": meta.get("video", {}).get("video_id"),
            "fps": meta.get("video", {}).get("fps"),
            "frames_processed": meta.get("metrics", {}).get("frames_processed"),
            "tracks_total": meta.get("metrics", {}).get("tracks_total"),
            "detections_kept": meta.get("metrics", {}).get("detections_kept"),
            "selected_device": meta.get("execution", {}).get("selected_device"),
            "valid_region": {
                "enabled": meta.get("valid_region", {}).get("enabled"),
                "x_start": meta.get("valid_region", {}).get("x_start"),
                "x_end": meta.get("valid_region", {}).get("x_end"),
                "width": meta.get("valid_region", {}).get("width"),
                "method": meta.get("valid_region", {}).get("method"),
            },
        }

        return (
            json.dumps(summary, indent=2, ensure_ascii=False),
            valid_region_overlay if valid_region_overlay and Path(valid_region_overlay).exists() else None,
            tracks_overlay if tracks_overlay and Path(tracks_overlay).exists() else None,
            gr.update(
                headers=table_headers,
                value=table_value,
                column_count=(len(table_headers), "fixed"),
            ),
            str(events_csv),
            outputs.get("tracks_csv"),
        )
    except Exception as exc:  # pragma: no cover - UI surface
        raise gr.Error(f"Error ejecutando el pipeline: {exc}") from exc


APP_THEME = gr.themes.Soft(
    primary_hue="yellow",
    secondary_hue="stone",
    neutral_hue="gray",
).set(
    # Fondo exterior oscuro: el texto del cuerpo debe ser claro para el contraste.
    body_background_fill="rgb(28, 24, 20)",
    body_text_color="#ede6db",
    body_text_color_subdued="#b0a394",
    background_fill_primary="#faf7ef",
    background_fill_secondary="#f2ebe0",
    block_background_fill="#faf7ef",
    block_border_color="#d7d0c3",
    block_label_text_color="#3d352b",
    block_title_text_color="#2a231c",
    input_background_fill="#ffffff",
    input_border_color="#c5bcab",
    input_border_color_focus="#6f5d3f",
    input_placeholder_color="#61584d",
    button_primary_background_fill="#c89216",
    button_primary_background_fill_hover="#ad7d12",
    button_primary_text_color="#14110d",
)

APP_CSS = """
    .gradio-container {
      background: rgb(28, 24, 20);
      font-family: "Source Serif 4", Georgia, serif;
      color: #ede6db;
    }

    .app-shell {
      max-width: 1180px;
      margin: 0 auto;
      padding: 24px 12px 40px;
    }

    .hero {
      background: #faf7ef;
      border: 1px solid #d7d0c3;
      border-radius: 24px;
      padding: 24px;
      box-shadow: 0 8px 24px rgba(38, 28, 12, 0.07);
    }

    .hero h1 {
      margin: 0;
      font-size: clamp(2.2rem, 4vw, 3.6rem);
      line-height: 0.95;
      letter-spacing: -0.04em;
      text-transform: uppercase;
      color: #1b1510 !important;
    }

    .hero p {
      margin: 12px 0 0;
      max-width: 760px;
      color: #3f382e !important;
      font-size: 1rem;
    }

    .panel {
      border-radius: 16px;
    }

    .section-kicker {
      margin: 4px 0 10px;
      color: #5c4a32;
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
    }

    .examples-footer {
      margin-top: 8px;
      width: 100%;
    }

    .examples-footer .gr-examples {
      background: #f7f2e8;
      border: 1px solid #d7d0c3;
      border-radius: 12px;
      padding: 12px;
    }

    /* Tabla de ejemplos (varias columnas): aspecto de tabla clara */
    .examples-footer .gr-examples table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.95rem;
      color: #2a231c;
    }

    .examples-footer .gr-examples thead th {
      text-align: left;
      padding: 10px 12px;
      background: #ebe3d4;
      border: 1px solid #c5bcab;
      font-weight: 700;
      color: #3d352b;
    }

    .examples-footer .gr-examples tbody td {
      vertical-align: middle;
      padding: 10px 12px;
      border: 1px solid #d7d0c3;
      background: #fffdf8;
    }

    .examples-footer .gr-examples tbody tr:hover td {
      background: #f3ece0;
    }

    .examples-footer .gr-examples tbody td:first-child {
      width: 136px;
      min-width: 136px;
      max-width: 136px;
    }

    .examples-footer .gr-examples tbody td:first-child video {
      width: 112px;
      height: 64px;
      object-fit: cover;
      display: block;
      border-radius: 10px;
      background: #1b1510;
      border: 1px solid #c5bcab;
    }

    .config-note,
    .config-note * {
      color: #4a4238 !important;
      opacity: 1 !important;
    }

    .config-note code {
      background: rgba(92, 74, 50, 0.12) !important;
      color: #2a231c !important;
      border: none !important;
      padding: 0.1em 0.35em !important;
      border-radius: 4px;
    }
    """


with gr.Blocks(title=APP_TITLE) as demo:
    with gr.Column(elem_classes=["app-shell"]):
        gr.HTML(
            f"""
            <section class="hero">
              <h1>Bat Tracker Space {APP_VERSION}</h1>
              <p>
                Interfaz minima para ejecutar el tracker sobre un video, inspeccionar la
                region valida detectada y revisar los eventos agregados en forma de tabla.
              </p>
            </section>
            """
        )

        with gr.Row(equal_height=False):
            with gr.Column(scale=1, elem_classes=["panel"]):
                gr.HTML('<div class="section-kicker">Entrada</div>')
                video_input = gr.File(
                    label="Video de entrada",
                    file_types=["video", ".mov", ".MOV", ".mp4", ".MP4", ".avi", ".AVI", ".mkv", ".MKV"],
                    type="filepath",
                )
                config_input = gr.File(
                    label="Configuración YAML opcional",
                    file_types=[".yaml", ".yml"],
                    type="filepath",
                )
                run_button = gr.Button("Procesar", variant="primary")
                gr.Markdown(
                    "Si no subes configuración, se usará `config.out3_clean.yaml`.",
                    elem_classes=["config-note"],
                )
                example_thumbnail = gr.Video(
                    label="Miniatura",
                    interactive=False,
                    visible=False,
                )
                example_file_size = gr.Textbox(
                    label="Peso (original)",
                    interactive=False,
                    visible=False,
                )
                example_duration = gr.Textbox(
                    label="Duración",
                    interactive=False,
                    visible=False,
                )
            with gr.Column(scale=1, elem_classes=["panel"]):
                gr.HTML('<div class="section-kicker">Resumen</div>')
                summary_output = gr.Textbox(
                    label="Resumen de ejecución",
                    lines=14,
                    max_lines=18,
                    interactive=False,
                )

        with gr.Row():
            valid_region_image = gr.Image(
                label="Región válida",
                type="filepath",
                interactive=False,
            )
            tracks_overlay_image = gr.Image(
                label="Tracks sobre fondo",
                type="filepath",
                interactive=False,
            )

        events_table = gr.Dataframe(
            label="events.csv",
            headers=["Sin resultados"],
            value=[],
            datatype="str",
            interactive=False,
            wrap=True,
            row_count=(0, "dynamic"),
            column_count=(1, "fixed"),
        )

        with gr.Row():
            events_csv_download = gr.File(label="Descargar events.csv")
            tracks_csv_download = gr.File(label="Descargar tracks.csv")

        with gr.Column(elem_classes=["examples-footer"]):
            gr.Markdown(
                "### Ejemplos de vídeo\n"
                "Pulsa una fila de la tabla para cargar ese vídeo en **Video de entrada** (arriba). "
                "**Peso** y **duración** corresponden al archivo original en el bucket. "
                "El segundo ejemplo es muy grande y puede tardar en descargarse."
            )
            gr.Examples(
                examples=[list(row) for row in EXAMPLE_VIDEO_ROWS],
                inputs=[example_thumbnail, video_input, example_file_size, example_duration],
                label="Vídeos de ejemplo",
                cache_examples=False,
                examples_per_page=6,
            )

        run_button.click(
            fn=process_video,
            inputs=[video_input, config_input],
            outputs=[
                summary_output,
                valid_region_image,
                tracks_overlay_image,
                events_table,
                events_csv_download,
                tracks_csv_download,
            ],
        )


if __name__ == "__main__":
    demo.launch(theme=APP_THEME, css=APP_CSS, ssr_mode=False)