import ast
import colorsys
import hashlib
import json
from pathlib import Path

import numpy as np
import pandas as pd

try:
    import pydeck as pdk
    import streamlit as st
except ImportError as exc:
    raise SystemExit(
        "viewer_fusion.py requires streamlit and pydeck.\n"
        "Install them with: pip install streamlit pydeck\n"
        "Then run: streamlit run viewer_fusion.py"
    ) from exc

BASE_DIR = Path(__file__).resolve().parent
FUSION_DIR = BASE_DIR / "datasets" / "fusion"
ICON_PATH = BASE_DIR / "resources" / "erp.jpeg"
TABLE_PATH = FUSION_DIR / "data_table.csv"
META_NAMES_PATH = FUSION_DIR / "meta_column_names.json"
META_COMPLETE_PATH = FUSION_DIR / "meta_column_complete.json"
DEFAULT_PROPERTY = "texture:USDA_class"
DEFAULT_VIEWPORT = {"lat": 50.0, "lon": 10.0, "zoom": 3.2}
MAP_HEIGHT_PX = 560

CORE_UI_PROPERTIES = [
    {"label": "USDA texture class", "property": "texture:USDA_class"},
    {"label": "clay percentage", "property": "texture:clay_percentage (%)"},
    {"label": "silt percentage", "property": "texture:silt_percentage (%)"},
    {"label": "sand percentage", "property": "texture:sand_percentage (%)"},
    {"label": "coarse fragments", "property": "texture:coarse_percentage (%)"},
    {"label": "bulk density", "property": "mass_density:bulk_density (g/cm³)"},
    {"label": "bulk density 0-10cm", "property": "mass_density:bulk_density_0_10cm (g/cm³)"},
    {"label": "bulk density 10-20cm", "property": "mass_density:bulk_density_10_20cm (g/cm³)"},
    {"label": "pH in water", "property": "chemical:pH_in_H2O"},
    {"label": "pH in CaCl2", "property": "chemical:pH_in_CaCl2"},
    {"label": "organic carbon", "property": "carbon:organic_carbon_content (g/kg)"},
    {"label": "topsoil organic carbon", "property": "carbon:organic_carbon_content_topsoil (g/kg)"},
    {"label": "calcium carbonate", "property": "carbon:CaCO3_content (g/kg)"},
    {"label": "extractable nitrogen", "property": "fertility:N_extractable (g/kg)"},
    {"label": "extractable phosphorus", "property": "fertility:P_extractable (mg/kg)"},
    {"label": "extractable potassium", "property": "fertility:K_extractable (mg/kg)"},
    {"label": "cation exchange capacity", "property": "fertility:cation_exchange_capacity (cmol(+)/kg)"},
    {"label": "annual precipitation", "property": "climate:annual_precipitation (mm)"},
    {"label": "annual temperature", "property": "climate:annual_temperature (°C)"},
    {"label": "elevation", "property": "topography_geology:elevation (m)"},
    {"label": "slope", "property": "topography_geology:slope (deg)"},
]

CORE_VIEWPORTS = {
    "europe": {"lat": 50.0, "lon": 10.0, "zoom": 3.2},
    "iberia": {"lat": 40.0, "lon": -4.0, "zoom": 5.0},
    "portugal": {"lat": 39.6, "lon": -8.0, "zoom": 6.0},
    "spain": {"lat": 40.3, "lon": -3.7, "zoom": 5.6},
    "france": {"lat": 46.6, "lon": 2.2, "zoom": 5.4},
    "germany": {"lat": 51.2, "lon": 10.4, "zoom": 5.5},
    "italy": {"lat": 42.8, "lon": 12.5, "zoom": 5.4},
    "uk": {"lat": 54.2, "lon": -2.5, "zoom": 5.3},
    "ireland": {"lat": 53.4, "lon": -8.0, "zoom": 6.0},
    "netherlands": {"lat": 52.2, "lon": 5.3, "zoom": 7.0},
    "poland": {"lat": 52.1, "lon": 19.4, "zoom": 5.7},
    "greece": {"lat": 39.0, "lon": 22.0, "zoom": 5.6},
    "scandinavia": {"lat": 62.0, "lon": 15.0, "zoom": 4.2},
    "balkans": {"lat": 44.0, "lon": 20.0, "zoom": 5.0},
}

BASE_COLUMNS = [
    "id",
    "LAT_LONG",
    "GADM_IDS",
    "GADM_NAMES",
    "COUNTRY_CODE",
    "SAMPLE_DATE",
    "SAMPLE_DEPTH_RANGE_CM",
    "SAMPLE_SOURCE_DATASET",
]


def split_property_name(name):
    if ":" not in name:
        return "other", name
    theme, prop = name.split(":", 1)
    return theme, prop


def init_ui_state():
    st.session_state.setdefault("selected_property", DEFAULT_PROPERTY)
    st.session_state.setdefault("viewport", DEFAULT_VIEWPORT.copy())
    st.session_state.setdefault("ui_agent_messages", [])


def apply_compact_layout():
    st.markdown(
        """
        <style>
          .block-container {
            max-width: 100%;
            padding-top: 1.0rem;
            padding-right: 1.25rem;
            padding-left: 1.25rem;
            padding-bottom: 1.25rem;
          }
          [data-testid="stSidebar"] .block-container {
            padding-top: 1.0rem;
          }
          h1 {
            margin-top: 0;
            margin-bottom: 0.35rem;
          }
          div[data-testid="stCaptionContainer"] {
            margin-bottom: 0.4rem;
          }
        </style>
        """,
        unsafe_allow_html=True,
    )


@st.cache_data(show_spinner=False)
def list_openai_models(api_key):
    try:
        from openai import OpenAI
    except ImportError:
        return [], "OpenAI SDK is not installed. Install it with: pip install openai"

    try:
        client = OpenAI(api_key=api_key)
        models = client.models.list()
    except Exception as exc:
        return [], f"Could not load OpenAI models: {exc}"

    model_ids = sorted(model.id for model in models.data)
    chat_like = [
        model_id
        for model_id in model_ids
        if model_id.startswith(("gpt-", "o"))
        and not any(token in model_id for token in ("audio", "transcribe", "tts", "image", "realtime"))
    ]
    return chat_like or model_ids, None


@st.cache_data(show_spinner=False)
def load_metadata():
    with open(META_NAMES_PATH, encoding="utf-8") as f:
        names = json.load(f)["column_names"]

    with open(META_COMPLETE_PATH, encoding="utf-8") as f:
        meta = json.load(f)

    groups = {}
    for name in names:
        theme, prop = split_property_name(name)
        groups.setdefault(theme, []).append((prop, name))

    for theme in groups:
        groups[theme].sort(key=lambda item: item[0].lower())

    return names, meta, dict(sorted(groups.items()))


def parse_lat_long(value):
    if pd.isna(value):
        return np.nan, np.nan
    if isinstance(value, str):
        try:
            parsed = ast.literal_eval(value)
        except (SyntaxError, ValueError):
            return np.nan, np.nan
    else:
        parsed = value
    if not isinstance(parsed, (list, tuple)) or len(parsed) < 2:
        return np.nan, np.nan
    return float(parsed[0]), float(parsed[1])


def vector_mean(value):
    if pd.isna(value) or value == "":
        return np.nan
    if isinstance(value, str):
        try:
            value = ast.literal_eval(value)
        except (SyntaxError, ValueError):
            return np.nan
    if not isinstance(value, (list, tuple)):
        return np.nan
    nums = pd.to_numeric(pd.Series(value), errors="coerce").dropna()
    return float(nums.mean()) if len(nums) else np.nan


@st.cache_data(show_spinner=False)
def load_property_frame(property_name):
    columns = [
        "id",
        "LAT_LONG",
        "GADM_NAMES",
        "COUNTRY_CODE",
        "SAMPLE_DEPTH_RANGE_CM",
        "SAMPLE_SOURCE_DATASET",
        property_name,
    ]
    df = pd.read_csv(
        TABLE_PATH,
        usecols=columns,
        low_memory=False,
        keep_default_na=True,
    )

    lat_lon = df["LAT_LONG"].map(parse_lat_long)
    df["lat"] = [item[0] for item in lat_lon]
    df["lon"] = [item[1] for item in lat_lon]
    df = df.dropna(subset=["lat", "lon"])
    return df


def parse_sample_identity(sample_id):
    parts = str(sample_id).rsplit("_", 2)
    if len(parts) == 3:
        dataset_id, point_id, sample_id = parts
        return dataset_id, point_id, sample_id
    return "", str(sample_id), str(sample_id)


COLOR_STOPS = [
    (68, 1, 84),
    (59, 82, 139),
    (33, 145, 140),
    (94, 201, 98),
    (253, 231, 37),
]


def interpolate_color(value, vmin, vmax):
    if pd.isna(value):
        return [150, 150, 150, 55]
    if pd.isna(vmin) or pd.isna(vmax) or vmax <= vmin:
        t = 0.5
    else:
        t = float((value - vmin) / (vmax - vmin))
    t = max(0.0, min(1.0, t))

    pos = t * (len(COLOR_STOPS) - 1)
    left = int(np.floor(pos))
    right = min(left + 1, len(COLOR_STOPS) - 1)
    frac = pos - left
    rgb = [
        int(COLOR_STOPS[left][i] + frac * (COLOR_STOPS[right][i] - COLOR_STOPS[left][i]))
        for i in range(3)
    ]
    return rgb + [180]


def category_color(value):
    if pd.isna(value) or value == "":
        return [150, 150, 150, 55]
    digest = hashlib.md5(str(value).encode("utf-8")).hexdigest()
    hue = int(digest[:8], 16) / 0xFFFFFFFF
    red, green, blue = colorsys.hsv_to_rgb(hue, 0.62, 0.92)
    return [int(red * 255), int(green * 255), int(blue * 255), 185]


def get_visual_mode(property_meta):
    datatype = property_meta.get("datatype")
    is_array = property_meta.get("is_array_valued", False)
    if is_array:
        return "numeric vector mean"
    if datatype in {"int", "float"}:
        return "numeric scalar"
    return "categorical"


def calculate_color_values(df, property_name, property_meta):
    raw = df[property_name]
    mode = get_visual_mode(property_meta)

    if mode == "numeric vector mean":
        values = raw.map(vector_mean)
    elif mode == "numeric scalar":
        values = pd.to_numeric(raw, errors="coerce")
    else:
        values = raw.fillna("").astype(str)
    return raw, values, mode


def prepare_visual_values(df, property_name, property_meta, color_limits=None):
    raw, values, mode = calculate_color_values(df, property_name, property_meta)

    out = df.copy()
    out["display_value"] = raw.fillna("").astype(str)

    if mode.startswith("numeric"):
        non_null = values.dropna()
        if len(non_null):
            default_vmin = float(non_null.quantile(0.02))
            default_vmax = float(non_null.quantile(0.98))
        else:
            default_vmin = default_vmax = np.nan
        if color_limits:
            vmin, vmax = color_limits
        else:
            vmin, vmax = default_vmin, default_vmax
        out["color_value"] = values
        out["color"] = [interpolate_color(v, vmin, vmax) for v in values]
        legend = {
            "mode": mode,
            "valid": int(values.notna().sum()),
            "missing": int(values.isna().sum()),
            "min": float(non_null.min()) if len(non_null) else None,
            "max": float(non_null.max()) if len(non_null) else None,
            "p02": default_vmin if len(non_null) else None,
            "p98": default_vmax if len(non_null) else None,
            "vmin": vmin if len(non_null) else None,
            "vmax": vmax if len(non_null) else None,
        }
    else:
        categories = values.replace("", np.nan)
        unique_count = int(categories.nunique(dropna=True))
        out["color_value"] = values
        out["color"] = [category_color(v) for v in values]
        legend = {
            "mode": mode,
            "valid": int(categories.notna().sum()),
            "missing": int(categories.isna().sum()),
            "unique": unique_count,
            "top_values": categories.value_counts(dropna=True).head(12).to_dict(),
        }

    out["property"] = property_name
    return out, legend


def render_sidebar(groups, meta):
    st.sidebar.title("Fusion Viewer")

    api_key = st.sidebar.text_input(
        "OpenAI API token",
        type="password",
        help="Used only for this browser session. It is not saved to disk.",
    )
    model = None
    agent_enabled = False
    if api_key.strip():
        with st.sidebar.spinner("Loading models..."):
            models, model_error = list_openai_models(api_key.strip())
        if model_error:
            st.sidebar.warning(model_error)
        elif models:
            preferred = "gpt-5"
            default_index = models.index(preferred) if preferred in models else 0
            model = st.sidebar.selectbox("UI agent model", models, index=default_index)
            agent_enabled = True
        else:
            st.sidebar.warning("No OpenAI models available for this API token.")
    else:
        st.sidebar.selectbox(
            "UI agent model",
            ["Enter API token first"],
            index=0,
            disabled=True,
        )

    search = st.sidebar.text_input(
        "Search property",
        "",
        placeholder="type part of theme:name (unit)",
    )
    if search.strip():
        needle = search.strip().lower()
        matches = [
            name
            for theme_items in groups.values()
            for _, name in theme_items
            if needle in name.lower()
        ]
        if not matches:
            st.sidebar.warning("No matching properties.")
            return None
        st.sidebar.caption(f"{len(matches)} matching properties")
        property_name = st.sidebar.radio(
            "Matching properties",
            matches[:80],
            index=matches[:80].index(st.session_state.selected_property)
            if st.session_state.selected_property in matches[:80]
            else 0,
            format_func=lambda x: x,
            label_visibility="collapsed",
        )
        st.session_state.selected_property = property_name
        if len(matches) > 80:
            st.sidebar.caption("Showing first 80 matches. Type more to narrow.")
    else:
        themes = list(groups.keys())
        current_theme, _ = split_property_name(st.session_state.selected_property)
        theme_index = themes.index(current_theme) if current_theme in themes else 0
        theme = st.sidebar.selectbox("Theme", themes, index=theme_index)
        options = [name for _, name in groups[theme]]
        property_index = (
            options.index(st.session_state.selected_property)
            if st.session_state.selected_property in options
            else 0
        )
        property_name = st.sidebar.selectbox(
            "Property",
            options,
            index=property_index,
            format_func=lambda x: split_property_name(x)[1],
        )
        st.session_state.selected_property = property_name

    with st.sidebar.expander("Property metadata", expanded=False):
        item = meta.get(property_name, {})
        st.write("datatype:", item.get("datatype"))
        st.write("array:", item.get("is_array_valued"))
        st.write("null_fraction:", item.get("null_fraction"))
        st.write("source_datasets:", item.get("source_datasets"))
        description = item.get("description")
        if description:
            st.caption(description)

    return property_name, api_key, model, agent_enabled


def render_color_controls(property_name, property_meta, df):
    raw, values, mode = calculate_color_values(df, property_name, property_meta)
    if not mode.startswith("numeric"):
        return None

    non_null = values.dropna()
    if not len(non_null):
        st.sidebar.warning("No numeric values available for this property.")
        return None

    data_min = float(non_null.min())
    data_max = float(non_null.max())
    default_vmin = float(non_null.quantile(0.02))
    default_vmax = float(non_null.quantile(0.98))

    st.sidebar.subheader("Color scale")
    st.sidebar.caption("Scale is computed from all samples for the selected property, not from the current map view.")
    property_key = hashlib.md5(property_name.encode("utf-8")).hexdigest()[:12]
    use_full_range = st.sidebar.checkbox(
        "Use full data range",
        value=False,
        key=f"use_full_range_{property_key}",
    )
    if use_full_range:
        return data_min, data_max

    vmin = st.sidebar.number_input(
        "vmin",
        value=default_vmin,
        min_value=data_min,
        max_value=data_max,
        format="%.6g",
        key=f"vmin_{property_key}",
    )
    vmax = st.sidebar.number_input(
        "vmax",
        value=default_vmax,
        min_value=data_min,
        max_value=data_max,
        format="%.6g",
        key=f"vmax_{property_key}",
    )
    if vmax <= vmin:
        st.sidebar.warning("vmax must be larger than vmin; using percentile defaults.")
        return default_vmin, default_vmax
    return float(vmin), float(vmax)


def render_legend(legend):
    cols = st.columns(4)
    cols[0].metric("Mode", legend["mode"])
    cols[1].metric("Valid", f"{legend['valid']:,}")
    cols[2].metric("Missing", f"{legend['missing']:,}")

    if legend["mode"].startswith("numeric"):
        cols[3].metric("Range", "2%-98%")
        st.caption(
            f"Actual min/max: {legend['min']} / {legend['max']} | "
            f"color clamp: {legend['p02']} / {legend['p98']}"
        )
    else:
        cols[3].metric("Unique", f"{legend['unique']:,}")
        if legend["top_values"]:
            st.caption("Top categories: " + "; ".join(
                f"{k}: {v}" for k, v in legend["top_values"].items()
            ))


def render_colorbar(legend):
    if legend["mode"].startswith("numeric"):
        gradient = ", ".join(f"rgb({r}, {g}, {b})" for r, g, b in COLOR_STOPS)
        st.markdown(
            f"""
            <div style="margin-top: 0.75rem;">
              <div style="height: 14px; border-radius: 7px;
                          background: linear-gradient(90deg, {gradient});"></div>
              <div style="display: flex; justify-content: space-between;
                          font-size: 0.82rem; color: #666; margin-top: 0.2rem;">
                <span>vmin: {legend["vmin"]}</span>
                <span>vmax: {legend["vmax"]}</span>
              </div>
            </div>
            """,
            unsafe_allow_html=True,
        )
    else:
        top_values = legend.get("top_values", {})
        if not top_values:
            return
        swatches = []
        for value in top_values:
            r, g, b, _ = category_color(value)
            swatches.append(
                "<span style='display:inline-flex; align-items:center; gap:0.25rem; "
                "margin:0 0.65rem 0.35rem 0;'>"
                f"<span style='width:0.75rem; height:0.75rem; border-radius:50%; "
                f"background:rgb({r},{g},{b}); display:inline-block;'></span>"
                f"<span>{value}</span></span>"
            )
        st.markdown("".join(swatches), unsafe_allow_html=True)


def is_valid_display_value(value):
    text = str(value).strip()
    return text != "" and text.lower() not in {"nan", "none", "null"}


def format_overlap_line(row):
    sample = row.get("sample_id", row.get("id", ""))
    value = row.get("display_value", "")
    depth = row.get("SAMPLE_DEPTH_RANGE_CM", "")
    source = row.get("SAMPLE_SOURCE_DATASET", "")
    parts = [str(sample)]
    if is_valid_display_value(depth):
        parts.append(f"depth={depth}")
    if is_valid_display_value(source):
        parts.append(str(source))
    prefix = " | ".join(parts)
    return f"{prefix}: {value}"


def build_map_records(df):
    df = df.copy()
    identities = df["id"].map(parse_sample_identity)
    df["dataset_id"] = [item[0] for item in identities]
    df["point_id"] = [item[1] for item in identities]
    df["sample_id"] = [item[2] for item in identities]
    df["tooltip_location"] = df["GADM_NAMES"].fillna("").astype(str).str.replace(
        r"^[\[\]'\" ]+|[\[\]'\" ]+$",
        "",
        regex=True,
    )

    single_records = []
    overlap_records = []

    for point_id, group in df.groupby("point_id", sort=False):
        if len(group) == 1:
            row = group.iloc[0]
            single_records.append({
                "id": row["id"],
                "lon": float(row["lon"]),
                "lat": float(row["lat"]),
                "color": row["color"],
                "tooltip_text": (
                    f"{row['id']}\n"
                    f"{row['COUNTRY_CODE']} · {row['tooltip_location']}\n"
                    f"{row['property']}\n"
                    f"{row['display_value']}"
                ),
            })
            continue

        valid = group[group["display_value"].map(is_valid_display_value)]
        selected = valid.iloc[0] if len(valid) else group.iloc[0]
        lines = [format_overlap_line(row) for _, row in group.head(16).iterrows()]
        if len(group) > 16:
            lines.append(f"... {len(group) - 16} more samples")

        overlap_records.append({
            "id": f"{point_id} ({len(group)} samples)",
            "lon": float(selected["lon"]),
            "lat": float(selected["lat"]),
            "color": selected["color"],
            "tooltip_text": (
                    f"Point {point_id}: {len(group)} samples\n"
                    f"{selected['COUNTRY_CODE']} · {selected['tooltip_location']}\n"
                    f"{selected['property']}\n"
                    + "\n".join(lines)
            ),
        })

    return single_records, overlap_records


def render_map(df):
    viewport = st.session_state.get("viewport", DEFAULT_VIEWPORT)
    single_records, overlap_records = build_map_records(df)

    layers = []
    if single_records:
        layers.append(pdk.Layer(
            "ScatterplotLayer",
            data=single_records,
            get_position="[lon, lat]",
            get_fill_color="color",
            get_radius=1800,
            radius_min_pixels=2,
            radius_max_pixels=12,
            pickable=True,
            auto_highlight=True,
        ))

    if overlap_records:
        layers.append(pdk.Layer(
            "ScatterplotLayer",
            data=overlap_records,
            get_position="[lon, lat]",
            stroked=True,
            filled=True,
            get_fill_color="[0, 0, 0, 1]",
            get_line_color="color",
            get_radius=1800,
            radius_min_pixels=2,
            radius_max_pixels=12,
            line_width_min_pixels=3,
            pickable=True,
            auto_highlight=True,
        ))

    view_state = pdk.ViewState(
        longitude=viewport.get("lon", DEFAULT_VIEWPORT["lon"]),
        latitude=viewport.get("lat", DEFAULT_VIEWPORT["lat"]),
        zoom=viewport.get("zoom", DEFAULT_VIEWPORT["zoom"]),
        min_zoom=2,
        max_zoom=12,
    )

    tooltip = {"text": "{tooltip_text}"}

    deck = pdk.Deck(
        layers=layers,
        initial_view_state=view_state,
        map_style="light",
        tooltip=tooltip,
    )
    st.pydeck_chart(deck, use_container_width=True, height=MAP_HEIGHT_PX)
    if overlap_records:
        st.caption(
            f"{len(overlap_records):,} overlapping point markers are shown as rings. "
            "Their color uses the first sample in the group with a valid selected-property value."
        )


def core_property_prompt():
    lines = [
        f"- {item['label']}: {item['property']}"
        for item in CORE_UI_PROPERTIES
    ]
    return "\n".join(lines)


def strip_unit_suffix(property_name):
    text = str(property_name).strip()
    if text.endswith(")") and " (" in text:
        return text.rsplit(" (", 1)[0]
    return text


def normalize_property_text(text):
    return " ".join(str(text).strip().lower().split())


def resolve_property_name(candidate, valid_properties):
    if not candidate:
        return None, None

    candidate = str(candidate).strip()
    if candidate in valid_properties:
        return candidate, None

    normalized_candidate = normalize_property_text(candidate)
    valid_by_normalized = {
        normalize_property_text(prop): prop
        for prop in valid_properties
    }
    if normalized_candidate in valid_by_normalized:
        return valid_by_normalized[normalized_candidate], None

    valid_by_no_unit = {}
    for prop in valid_properties:
        key = normalize_property_text(strip_unit_suffix(prop))
        valid_by_no_unit.setdefault(key, []).append(prop)
    no_unit_matches = valid_by_no_unit.get(normalized_candidate, [])
    if len(no_unit_matches) == 1:
        return no_unit_matches[0], None
    if len(no_unit_matches) > 1:
        return None, f"ambiguous property without unit {candidate!r}: {no_unit_matches[:8]}"

    core_aliases = {}
    for item in CORE_UI_PROPERTIES:
        prop = item["property"]
        aliases = {
            item["label"],
            prop,
            strip_unit_suffix(prop),
            prop.split(":", 1)[-1],
            strip_unit_suffix(prop.split(":", 1)[-1]),
        }
        for alias in aliases:
            core_aliases.setdefault(normalize_property_text(alias), prop)

    if normalized_candidate in core_aliases:
        return core_aliases[normalized_candidate], None

    return None, f"unknown property {candidate!r}"


def viewport_prompt():
    lines = [
        f"- {name}: lat={view['lat']}, lon={view['lon']}, zoom={view['zoom']}"
        for name, view in CORE_VIEWPORTS.items()
    ]
    return "\n".join(lines)


def build_ui_agent_prompt(user_query, current_property, current_viewport):
    return f"""
You are a UI-control agent for the LUCAS-MEGA Fusion Viewer.

Your only job is to decide whether the user's query should update the UI.
Do not answer general knowledge questions. Do not explain soil science.
Return exactly one JSON object and nothing else.

If the query is unrelated to changing the map/property UI, return:
{{"need_update_ui": false, "property": null, "viewport_center": null, "viewport_bbox": null}}

If the query should update the UI, return:
{{
  "need_update_ui": true,
  "property": one of the allowed property strings or null,
  "viewport_center": {{"lat": number, "lon": number, "zoom": number}} or null,
  "viewport_bbox": null
}}

Allowed properties:
{core_property_prompt()}

Allowed named viewports:
{viewport_prompt()}

Rules:
- Pick the closest allowed property. Do not invent property names.
- The "property" value must be copied exactly from the allowed property strings, including units in parentheses.
- Never omit units from property names when units are present.
- For location requests, use the closest allowed named viewport when possible.
- If the user asks for a property but no location, update only "property".
- If the user asks for a location but no property, update only "viewport_center".
- If the user asks for both, update both.
- Use viewport_bbox only if you are certain; otherwise use viewport_center.

Current property: {current_property}
Current viewport: {json.dumps(current_viewport)}
User query: {user_query}
""".strip()


def call_ui_agent(api_key, model, user_query):
    try:
        from openai import OpenAI
    except ImportError:
        return None, "OpenAI SDK is not installed. Install it with: pip install openai"

    client = OpenAI(api_key=api_key)
    response = client.chat.completions.create(
        model=model,
        messages=[
            {
                "role": "user",
                "content": build_ui_agent_prompt(
                    user_query=user_query,
                    current_property=st.session_state.selected_property,
                    current_viewport=st.session_state.viewport,
                ),
            }
        ],
        response_format={"type": "json_object"},
    )
    text = response.choices[0].message.content or "{}"
    try:
        return json.loads(text), None
    except json.JSONDecodeError as exc:
        return None, f"Could not parse UI-agent JSON: {exc}"


def validate_viewport(viewport):
    if not isinstance(viewport, dict):
        return None
    try:
        lat = float(viewport["lat"])
        lon = float(viewport["lon"])
        zoom = float(viewport["zoom"])
    except (KeyError, TypeError, ValueError):
        return None
    if not (-90 <= lat <= 90 and -180 <= lon <= 180 and 2 <= zoom <= 12):
        return None
    return {"lat": lat, "lon": lon, "zoom": zoom}


def apply_ui_agent_result(result, valid_properties):
    if not isinstance(result, dict):
        return False, "No need to update UI. General reasoning is under development."
    if not result.get("need_update_ui"):
        return False, "No need to update UI. General reasoning is under development."

    updates = []
    property_name = result.get("property")
    if property_name:
        resolved_property, property_error = resolve_property_name(property_name, valid_properties)
        if resolved_property:
            st.session_state.selected_property = resolved_property
            updates.append(f"property -> {resolved_property}")
        else:
            return False, f"UI update rejected: {property_error}"

    viewport = validate_viewport(result.get("viewport_center"))
    if viewport:
        st.session_state.viewport = viewport
        updates.append(
            f"viewport -> lat={viewport['lat']:.3f}, lon={viewport['lon']:.3f}, zoom={viewport['zoom']:.2f}"
        )

    if not updates:
        return False, "No need to update UI. General reasoning is under development."
    return True, "Updated UI: " + "; ".join(updates)


@st.fragment
def render_chat(api_key, model, valid_properties, agent_enabled):
    st.divider()
    st.subheader("UI Agent")

    for message in st.session_state.ui_agent_messages:
        with st.chat_message(message["role"]):
            st.write(message["content"])

    if not agent_enabled:
        st.text_input(
            "Ask the UI agent to change property or region",
            value="Enter an OpenAI API token in the sidebar to enable the UI agent.",
            disabled=True,
            label_visibility="collapsed",
        )
        return

    prompt = st.chat_input("Ask the UI agent to change property or region")
    if not prompt:
        return

    st.session_state.ui_agent_messages.append({"role": "user", "content": prompt})

    result, error = call_ui_agent(api_key.strip(), model.strip(), prompt)
    if error:
        answer = error
        should_rerun = False
    else:
        should_rerun, answer = apply_ui_agent_result(result, valid_properties)

    st.session_state.ui_agent_messages.append({"role": "assistant", "content": answer})
    if should_rerun:
        st.rerun()
    st.rerun(scope="fragment")


def main():
    st.set_page_config(
        page_title="Fusion Viewer",
        page_icon=str(ICON_PATH),
        layout="wide",
        initial_sidebar_state="expanded",
    )
    apply_compact_layout()

    init_ui_state()
    names, meta, groups = load_metadata()
    valid_properties = set(names)
    if st.session_state.selected_property not in valid_properties:
        st.session_state.selected_property = DEFAULT_PROPERTY

    sidebar_result = render_sidebar(groups, meta)
    if sidebar_result is None:
        return
    property_name, api_key, model, agent_enabled = sidebar_result

    st.title("Fusion Viewer")
    st.caption(f"{len(names):,} properties from datasets/fusion")

    with st.spinner("Loading selected property..."):
        df = load_property_frame(property_name)
        color_limits = render_color_controls(property_name, meta[property_name], df)
        vis_df, legend = prepare_visual_values(
            df,
            property_name,
            meta[property_name],
            color_limits=color_limits,
        )

    render_map(vis_df)
    render_colorbar(legend)
    render_legend(legend)
    render_chat(api_key, model, valid_properties, agent_enabled)


if __name__ == "__main__":
    main()