"""UI logic for the "Estadístiques" page."""

from __future__ import annotations

import re
from pathlib import Path
from typing import Dict, List, Tuple

import altair as alt
import pandas as pd
import streamlit as st
import yaml

from databases import (
    get_audiodescription_history,
    get_feedback_rows_for_video_version,
    get_feedback_video_stats,
    get_videos_from_audiodescriptions,
)


def render_statistics_page() -> None:
    st.header("Estadístiques")

    col1, col2 = st.columns(2)

    with col1:
        mode_label = st.selectbox(
            "Mode d'agregació",
            ["mitjana", "mediana", "inicial", "actual"],
            help=(
                "mitjana: mitjana de totes les valoracions; "
                "mediana: valor central; "
                "inicial: primer registre en el temps; "
                "actual: darrer registre en el temps."
            ),
        )

    # Etiquetes humanes per als sis ítems (a partir de config.yaml -> labels)
    cfg_path = Path(__file__).resolve().parent.parent / "config.yaml"
    try:
        with cfg_path.open("r", encoding="utf-8") as f:
            cfg = yaml.safe_load(f) or {}
    except FileNotFoundError:
        cfg = {}

    labels_cfg = cfg.get("labels", {}) or {}
    raw_labels = [
        labels_cfg.get("score_1", "score_1"),
        labels_cfg.get("score_2", "score_2"),
        labels_cfg.get("score_3", "score_3"),
        labels_cfg.get("score_4", "score_4"),
        labels_cfg.get("score_5", "score_5"),
        labels_cfg.get("score_6", "score_6"),
    ]
    label_map = {f"score_{i+1}": raw_labels[i] for i in range(6)}

    order_options = {"nom": "video_name"}
    for i in range(6):
        key = f"score_{i+1}"
        human = raw_labels[i]
        order_options[human] = key

    with col2:
        order_label = st.selectbox(
            "Ordenar per",
            list(order_options.keys()),
            help=(
                "Indica el camp pel qual s'ordenen els vídeos a la taula: "
                "nom del vídeo o alguna de les sis característiques d'avaluació."
            ),
        )

    stats = get_feedback_video_stats(agg=mode_label)
    if not stats:
        st.caption("Encara no hi ha valoracions a demo/temp/feedback.db.")
        st.stop()

    df = pd.DataFrame(stats)

    # Ordenació segons el selector
    order_key = order_options[order_label]
    ascending = order_key == "video_name"
    df = df.sort_values(order_key, ascending=ascending, na_position="last")

    # Preparar taula per mostrar: seleccionar columnes i arrodonir valors numèrics
    display_cols = [
        "video_name",
        "n",
        "score_1",
        "score_2",
        "score_3",
        "score_4",
        "score_5",
        "score_6",
    ]
    df_display = df[display_cols].copy()

    # Arrodonir scores a la unitat (0 decimals)
    score_cols = [c for c in display_cols if c.startswith("score_")]
    df_display[score_cols] = df_display[score_cols].round(0)

    st.subheader("Taula agregada per vídeo")
    st.dataframe(
        df_display.rename(columns=label_map),
        use_container_width=True,
        hide_index=True,
    )

    st.markdown("---")
    st.subheader("Distribució temporal de l'audiodescripció i personatges")

    session_id = st.session_state.get("session_id", "")
    role = None
    if st.session_state.get("user") and isinstance(st.session_state.get("user"), dict):
        role = st.session_state["user"].get("role")

    accessible_rows = get_videos_from_audiodescriptions(session_id=session_id or None, role=role)
    if not accessible_rows:
        st.info("No hi ha cap vídeo amb audiodescripció disponible a audiodescriptions.db.")
        return

    video_row = st.selectbox(
        "Selecciona un vídeo per analitzar l'audiodescripció:",
        accessible_rows,
        format_func=lambda r: r["video_name"],
    )

    sha1 = video_row["sha1sum"]
    selected_video_name = video_row["video_name"]

    version_options = ["Salamandra", "MoE"]
    version = st.selectbox("Versió d'audiodescripció:", version_options)

    hist_options = ["Original", "HITL OK", "HITL Test"]
    hist_key_suffix = f"{sha1}_{version or 'none'}"
    hist_choice = st.radio(
        "Edició d'audiodescripció a analitzar",
        hist_options,
        index=1,
        key=f"stats_ad_hist_choice_{hist_key_suffix}",
        horizontal=True,
    )

    rows = get_audiodescription_history(sha1, version)
    if not rows:
        st.info("No s'ha trobat cap registre d'audiodescripció per a aquest vídeo i versió.")
        return

    row = rows[-1]

    if hist_choice == "Original":
        src_une = "une_ad"
    elif hist_choice == "HITL OK":
        src_une = "ok_une_ad"
    else:
        src_une = "test_une_ad"

    srt_text = row[src_une] if src_une in row.keys() and row[src_une] else ""
    if not srt_text:
        st.info("No hi ha contingut UNE-153010 per a l'opció seleccionada.")
        return

    ad_plus_time, ad_minus_time, character_times = _compute_time_distribution_from_srt(srt_text)

    labels: List[str] = []
    values: List[float] = []

    if ad_plus_time > 0:
        labels.append("AD+")
        values.append(ad_plus_time)
    if ad_minus_time > 0:
        labels.append("AD-")
        values.append(ad_minus_time)

    for name, t in character_times.items():
        if t > 0:
            labels.append(name)
            values.append(t)

    if not labels:
        st.info("No s'ha pogut calcular cap distribució temporal a partir del SRT proporcionat.")
        return

    total_time = sum(values)
    legend_labels: List[str] = []
    label_seconds: List[float] = []
    label_pct: List[float] = []
    for label, val in zip(labels, values):
        pct = (val / total_time * 100.0) if total_time > 0 else 0.0
        legend_labels.append(f"{label} ({val:.1f} s, {pct:.1f}%)")
        label_seconds.append(val)
        label_pct.append(pct)

    pie_df = pd.DataFrame(
        {
            "label": labels,
            "seconds": label_seconds,
            "percent": label_pct,
            "legend": legend_labels,
        }
    )

    pie_chart = (
        alt.Chart(pie_df)
        .mark_arc()
        .encode(
            theta=alt.Theta("seconds", stack=True),
            color=alt.Color("label", legend=alt.Legend(title="Categoria")),
            tooltip=[
                alt.Tooltip("label", title="Categoria"),
                alt.Tooltip("seconds", title="Temps (s)", format=".1f"),
                alt.Tooltip("percent", title="Percentatge", format=".1f"),
            ],
        )
    )

    st.altair_chart(pie_chart, use_container_width=True)

    total_duration, segments = _compute_timeline_segments_from_srt(srt_text)
    if total_duration <= 0 or not segments:
        return

    y_order: List[str] = []
    for base in ["AD-", "AD+"]:
        if base in labels and base not in y_order:
            y_order.append(base)

    for label in labels:
        if label in {"AD-", "AD+"}:
            continue
        if label not in y_order:
            y_order.append(label)

    seg_df = pd.DataFrame(
        [
            {
                "category": cat,
                "start_pct": (start_s / total_duration) * 100.0,
                "end_pct": (end_s / total_duration) * 100.0,
            }
            for start_s, end_s, cat in segments
            if cat in y_order and end_s > start_s
        ]
    )
    if seg_df.empty:
        return

    # Ordenació explícita de categories per l'eix Y
    category_scale = alt.Scale(domain=y_order)

    timeline_chart = (
        alt.Chart(seg_df)
        .mark_bar(size=8)
        .encode(
            x=alt.X("start_pct", title="Percentatge de durada del vídeo (%)", scale=alt.Scale(domain=[0, 100])),
            x2="end_pct",
            y=alt.Y("category", title="", scale=category_scale),
            color=alt.Color("category", legend=None),
        )
    )

    st.altair_chart(timeline_chart, use_container_width=True)

    rows_fb = get_feedback_rows_for_video_version(selected_video_name, version)
    if not rows_fb:
        return

    df_fb = pd.DataFrame([dict(r) for r in rows_fb])
    if df_fb.empty:
        return

    st.markdown("---")
    st.subheader("Distribució de les valoracions per a aquest vídeo i versió")

    score_cols = ["score_1", "score_2", "score_3", "score_4", "score_5", "score_6"]

    # Convertir a format llarg per poder fer un facet amb Altair
    long_df_rows: List[Dict[str, float | str]] = []
    for col in score_cols:
        if col not in df_fb.columns:
            continue
        for val in df_fb[col].dropna().tolist():
            long_df_rows.append(
                {
                    "score_name": col,
                    "score_label": label_map.get(col, col),
                    "value": float(val),
                }
            )

    if not long_df_rows:
        return

    long_df = pd.DataFrame(long_df_rows)

    box_chart = (
        alt.Chart(long_df)
        .mark_boxplot()
        .encode(
            y=alt.Y("value", title="Score (0-100)", scale=alt.Scale(domain=[0, 100])),
            # Eix X només s'utilitza per separar facetes; amaguem etiquetes i ticks
            x=alt.X("score_label:N", axis=alt.Axis(title=None, labels=False, ticks=False)),
        )
        .properties(width=130, height=150)
        .facet(
            column=alt.Column("score_label:N", title=None, header=alt.Header(labelAngle=0)),
        )
        .resolve_scale(y="shared")
    )

    # Configurar 2 files x 3 columnes aprox. mitjançant amplada i wrapping
    box_chart = box_chart.configure_facet(columns=3)

    st.altair_chart(box_chart, use_container_width=True)


_SRT_TS = re.compile(
    r"(?P<h1>\d{2}):(?P<m1>\d{2}):(?P<s1>\d{2}),(?P<ms1>\d{3})\s*-->\s*"
    r"(?P<h2>\d{2}):(?P<m2>\d{2}):(?P<s2>\d{2}),(?P<ms2>\d{3})"
)


def _ts_to_seconds(h: str, m: str, s: str, ms: str) -> float:
    return int(h) * 3600 + int(m) * 60 + int(s) + int(ms) / 1000.0


def _split_srt_blocks(srt_text: str) -> List[str]:
    text = srt_text.replace("\r\n", "\n").replace("\r", "\n")
    return [b.strip() for b in re.split(r"\n\s*\n", text) if b.strip()]


def _parse_block_time_and_lines(block: str) -> Tuple[Tuple[float, float] | None, List[str]]:
    lines = block.split("\n")
    if len(lines) < 2:
        return None, []
    ts_line = lines[1].strip()
    m = _SRT_TS.match(ts_line)
    if not m:
        return None, []
    start_s = _ts_to_seconds(m["h1"], m["m1"], m["s1"], m["ms1"])
    end_s = _ts_to_seconds(m["h2"], m["m2"], m["s2"], m["ms2"])
    return (start_s, end_s), [l.strip() for l in lines[2:] if l.strip()]


def _compute_time_distribution_from_srt(srt_text: str) -> Tuple[float, float, Dict[str, float]]:
    ad_plus = 0.0
    ad_minus = 0.0
    character_times: Dict[str, float] = {}

    blocks = _split_srt_blocks(srt_text)
    for block in blocks:
        time_info, text_lines = _parse_block_time_and_lines(block)
        if not time_info or not text_lines:
            continue

        start_s, end_s = time_info
        duration = max(0.0, end_s - start_s)
        if duration <= 0:
            continue

        first_line = text_lines[0]

        if first_line.startswith("(AD)"):
            ad_text_parts: List[str] = []
            for line in text_lines:
                if line.startswith("(AD)"):
                    ad_text_parts.append(line[len("(AD)") :].lstrip())
            ad_text = " ".join(ad_text_parts).strip()
            if ad_text:
                num_words = len(re.findall(r"\w+", ad_text, flags=re.UNICODE))
            else:
                num_words = 0

            spoken_time = num_words / 2.5 if num_words > 0 else 0.0
            if spoken_time >= duration:
                ad_plus += duration
            else:
                ad_plus += spoken_time
                ad_minus += duration - spoken_time
            continue

        m_char = re.match(r"^([A-ZÁÉÍÓÚÀÈÌÒÙÇÜÑ][^:]{0,40}):", first_line)
        if m_char:
            name = m_char.group(1).strip()
            character_times[name] = character_times.get(name, 0.0) + duration

    return ad_plus, ad_minus, character_times


def _compute_timeline_segments_from_srt(srt_text: str) -> Tuple[float, List[Tuple[float, float, str]]]:
    total_duration = 0.0
    segments: List[Tuple[float, float, str]] = []

    blocks = _split_srt_blocks(srt_text)
    for block in blocks:
        time_info, text_lines = _parse_block_time_and_lines(block)
        if not time_info or not text_lines:
            continue

        start_s, end_s = time_info
        duration = max(0.0, end_s - start_s)
        if duration <= 0:
            continue

        if end_s > total_duration:
            total_duration = end_s

        first_line = text_lines[0]

        if first_line.startswith("(AD)"):
            ad_text_parts: List[str] = []
            for line in text_lines:
                if line.startswith("(AD)"):
                    ad_text_parts.append(line[len("(AD)") :].lstrip())
            ad_text = " ".join(ad_text_parts).strip()
            if ad_text:
                num_words = len(re.findall(r"\w+", ad_text, flags=re.UNICODE))
            else:
                num_words = 0

            spoken_time = num_words / 2.5 if num_words > 0 else 0.0
            spoken_time = min(spoken_time, duration)

            if spoken_time > 0:
                segments.append((start_s, start_s + spoken_time, "AD+"))
            rest = duration - spoken_time
            if rest > 0:
                segments.append((start_s + spoken_time, end_s, "AD-"))
            continue

        m_char = re.match(r"^([A-ZÁÉÍÓÚÀÈÌÒÙÇÜÑ][^:]{0,40}):", first_line)
        if m_char:
            name = m_char.group(1).strip()
            segments.append((start_s, end_s, name))

    return total_duration, segments