"""All Gradio callbacks for the Pigeon Pea Pangenome Atlas."""

import plotly.graph_objects as go
import plotly.express as px
import pandas as pd
import numpy as np

from src.state import AppState
from src.gene_card import build_gene_card, render_gene_card_html, export_gene_report
from src.field_report import generate_field_report, export_report_json, export_report_csv

# Color palettes
CORE_COLORS = {"core": "#2E7D32", "shell": "#FFC107", "cloud": "#F44336", "unknown": "#9E9E9E"}
COUNTRY_COLORS = px.colors.qualitative.Set3


# ============================================================
# Quest 0 Callbacks
# ============================================================

def on_line_selected(line_id: str, state: AppState, data: dict) -> tuple:
    """
    Triggered by dropdown change.
    Returns: (total_genes, unique_genes, nearest_neighbor, updated_state)
    """
    if not line_id or state is None:
        state = AppState()
    state.selected_line = line_id

    line_stats = data["line_stats"]
    similarity = data["similarity"]

    row = line_stats[line_stats["line_id"] == line_id]
    if len(row) == 0:
        return "--", "--", "--", state

    total_genes = str(int(row.iloc[0]["genes_present_count"]))
    unique_genes = str(int(row.iloc[0]["unique_genes_count"]))

    # Nearest neighbor
    sim_rows = similarity[similarity["line_id"] == line_id]
    if len(sim_rows) > 0:
        top = sim_rows.nlargest(1, "jaccard_score").iloc[0]
        nearest = f"{top['neighbor_line_id']} ({top['jaccard_score']:.3f})"
    else:
        nearest = "--"

    return total_genes, unique_genes, nearest, state


def on_start_journey(state: AppState) -> tuple:
    """Award Explorer achievement and switch to Quest 1."""
    if state is None:
        state = AppState()
    state.award("Explorer")
    return gr.Tabs(selected="quest1"), state


# ============================================================
# Quest 1 Callbacks
# ============================================================

def build_umap_plot(color_by: str, state: AppState, data: dict) -> go.Figure:
    """Build 3D UMAP scatter (delegates to quest1.build_umap_3d)."""
    from ui.quest1 import build_umap_3d

    selected_line = state.selected_line if state else None
    color_key = "country" if color_by == "Country" else "cluster"
    return build_umap_3d(
        data["embedding"], data["line_stats"],
        color_by=color_key, selected_line=selected_line,
    )


def on_umap_select(selected_data, state: AppState) -> tuple:
    """Handle UMAP point selection."""
    if state is None:
        state = AppState()
    if selected_data and "points" in selected_data:
        selected_lines = [p.get("hovertext", p.get("text", "")) for p in selected_data["points"]]
        selected_lines = [l for l in selected_lines if l]
        state.selected_party = selected_lines
        party_text = f"Selected {len(selected_lines)} lines: " + ", ".join(selected_lines[:10])
        if len(selected_lines) > 10:
            party_text += f" ... +{len(selected_lines) - 10} more"
    else:
        state.selected_party = []
        party_text = "None selected"
    return party_text, state


def on_compare_party(state: AppState, data: dict) -> tuple:
    """Compare selected line vs party."""
    if not state or not state.selected_line or not state.selected_party:
        fig = go.Figure()
        fig.add_annotation(text="Select your line and a party first", showarrow=False)
        return fig, True

    pav = data.get("pav")
    if pav is None:
        fig = go.Figure()
        fig.add_annotation(text="PAV data not loaded", showarrow=False)
        return fig, True

    my_genes = set(pav.index[pav[state.selected_line] == 1])
    party_cols = [c for c in state.selected_party if c in pav.columns and c != state.selected_line]
    if not party_cols:
        fig = go.Figure()
        fig.add_annotation(text="No valid party members", showarrow=False)
        return fig, True

    party_genes = set()
    for col in party_cols:
        party_genes |= set(pav.index[pav[col] == 1])

    shared = len(my_genes & party_genes)
    only_mine = len(my_genes - party_genes)
    only_party = len(party_genes - my_genes)

    fig = go.Figure(data=[
        go.Bar(name="Shared", x=["Gene Sets"], y=[shared], marker_color="#2E7D32"),
        go.Bar(name=f"Only {state.selected_line}", x=["Gene Sets"], y=[only_mine], marker_color="#1565C0"),
        go.Bar(name="Only Party", x=["Gene Sets"], y=[only_party], marker_color="#FFC107"),
    ])
    fig.update_layout(
        barmode="group",
        title=f"Gene Comparison: {state.selected_line} vs {len(party_cols)} party members",
        yaxis_title="Number of genes",
    )
    return fig, True


# ============================================================
# Quest 2 Callbacks
# ============================================================

def build_donut_chart(core_thresh: float, cloud_thresh: float, data: dict) -> go.Figure:
    """Build core/shell/cloud donut chart."""
    gene_freq = data["gene_freq"]

    core = int((gene_freq["freq_pct"] >= core_thresh).sum())
    cloud = int((gene_freq["freq_pct"] < cloud_thresh).sum())
    shell = len(gene_freq) - core - cloud

    fig = go.Figure(data=[go.Pie(
        labels=["Core", "Shell", "Cloud"],
        values=[core, shell, cloud],
        hole=0.5,
        marker_colors=[CORE_COLORS["core"], CORE_COLORS["shell"], CORE_COLORS["cloud"]],
        textinfo="label+value+percent",
    )])
    fig.update_layout(
        title=f"Gene Classification (Core>={core_thresh}%, Cloud<{cloud_thresh}%)",
        showlegend=True,
    )
    return fig


def build_frequency_histogram(core_thresh: float, cloud_thresh: float, data: dict) -> go.Figure:
    """Build colored histogram of gene frequencies."""
    gene_freq = data["gene_freq"]

    fig = go.Figure()
    for cls, color in CORE_COLORS.items():
        if cls == "unknown":
            continue
        subset = gene_freq[gene_freq["core_class"] == cls]
        fig.add_trace(go.Histogram(
            x=subset["freq_pct"],
            name=cls.capitalize(),
            marker_color=color,
            opacity=0.75,
            nbinsx=50,
        ))

    fig.update_layout(
        barmode="overlay",
        title="Gene Frequency Distribution",
        xaxis_title="Frequency (%)",
        yaxis_title="Count",
    )
    # Add threshold lines
    fig.add_vline(x=core_thresh, line_dash="dash", line_color="green",
                  annotation_text=f"Core>={core_thresh}%")
    fig.add_vline(x=cloud_thresh, line_dash="dash", line_color="red",
                  annotation_text=f"Cloud<{cloud_thresh}%")
    return fig


def build_treasure_table(state: AppState, core_thresh: float, cloud_thresh: float,
                         filter_type: str, data: dict) -> pd.DataFrame:
    """Build gene treasure table with current filters."""
    gene_freq = data["gene_freq"].copy()

    # Reclassify based on current thresholds
    gene_freq["core_class"] = gene_freq["freq_pct"].apply(
        lambda x: "core" if x >= core_thresh else ("cloud" if x < cloud_thresh else "shell")
    )

    # Add in_my_line column
    pav = data.get("pav")
    if pav is not None and state and state.selected_line and state.selected_line in pav.columns:
        my_presence = pav[state.selected_line]
        gene_freq["in_my_line"] = gene_freq["gene_id"].map(
            lambda g: "Yes" if g in my_presence.index and my_presence.get(g, 0) == 1 else "No"
        )
    else:
        gene_freq["in_my_line"] = "N/A"

    # Filter
    if filter_type == "Unique to my line":
        if pav is not None and state and state.selected_line:
            unique_mask = (pav.sum(axis=1) == 1) & (pav[state.selected_line] == 1)
            unique_genes = set(pav.index[unique_mask])
            gene_freq = gene_freq[gene_freq["gene_id"].isin(unique_genes)]
    elif filter_type == "Rare (<5 lines)":
        gene_freq = gene_freq[gene_freq["freq_count"] <= 5]
    elif filter_type == "Cluster markers":
        markers = data.get("markers")
        if markers is not None:
            marker_genes = set(markers["gene_id"])
            gene_freq = gene_freq[gene_freq["gene_id"].isin(marker_genes)]

    # Sort and limit
    gene_freq = gene_freq.sort_values("freq_count", ascending=True).head(500)
    return gene_freq[["gene_id", "freq_count", "freq_pct", "core_class", "in_my_line"]]


def on_pin_gene(gene_id: str, state: AppState) -> tuple:
    """Add gene to backpack."""
    if state is None:
        state = AppState()
    if not gene_id or gene_id == "Click a row to select":
        return "Select a gene first", state

    added = state.add_to_backpack(gene_id)
    backpack_text = ", ".join(state.backpack_genes) if state.backpack_genes else "Empty"
    if not added:
        backpack_text = f"(already in backpack) {backpack_text}"
    return backpack_text, state


def on_gene_click_table(evt, state: AppState) -> tuple:
    """Handle table row selection."""
    if state is None:
        state = AppState()
    if evt is not None and hasattr(evt, 'value'):
        gene_id = str(evt.value)
        state.selected_gene = gene_id
        return gene_id, state
    return "Click a row to select", state


# ============================================================
# Quest 3 Callbacks
# ============================================================

def build_hotspot_heatmap(data: dict, top_n_contigs: int = 20) -> go.Figure:
    """Build contig x bin heatmap from hotspot_bins."""
    hotspots = data["hotspots"]

    # Top N contigs by total genes
    contig_counts = hotspots.groupby("contig_id")["total_genes"].sum()
    top_contigs = contig_counts.nlargest(top_n_contigs).index.tolist()
    subset = hotspots[hotspots["contig_id"].isin(top_contigs)]

    if len(subset) == 0:
        fig = go.Figure()
        fig.add_annotation(text="No hotspot data available", showarrow=False)
        return fig

    pivot = subset.pivot_table(
        index="contig_id", columns="bin_start",
        values="variability_score", aggfunc="max"
    ).fillna(0)

    # Shorten contig names for display
    short_names = [c.split("|")[-1] if "|" in c else c[:30] for c in pivot.index]

    fig = go.Figure(data=go.Heatmap(
        z=pivot.values,
        x=[f"{int(c/1000)}kb" for c in pivot.columns],
        y=short_names,
        colorscale=[[0, "#E8F5E9"], [0.5, "#FFC107"], [1.0, "#F44336"]],
        colorbar_title="Variability",
        hovertemplate="Contig: %{y}<br>Bin: %{x}<br>Score: %{z:.1f}<extra></extra>",
    ))
    fig.update_layout(
        title=f"Genomic Variability Heatmap (Top {top_n_contigs} contigs)",
        xaxis_title="Genomic position",
        yaxis_title="Contig",
        height=600,
        xaxis=dict(
            tickangle=-45,
            nticks=20,
            tickfont=dict(size=10),
        ),
        margin=dict(b=80),
    )
    return fig


def on_contig_selected(contig_id: str, data: dict, state: AppState) -> tuple:
    """Build track plot for selected contig."""
    if not contig_id:
        return go.Figure(), pd.DataFrame()

    gff = data["gff_index"]
    gene_freq = data["gene_freq"]

    contig_genes = gff[gff["contig_id"] == contig_id].merge(
        gene_freq[["gene_id", "core_class", "freq_pct"]], on="gene_id", how="left"
    )
    contig_genes["core_class"] = contig_genes["core_class"].fillna("unknown")

    if len(contig_genes) == 0:
        fig = go.Figure()
        fig.add_annotation(text="No genes on this contig", showarrow=False)
        return fig, pd.DataFrame()

    fig = go.Figure()
    for cls, color in CORE_COLORS.items():
        subset = contig_genes[contig_genes["core_class"] == cls]
        if len(subset) == 0:
            continue
        fig.add_trace(go.Scatter(
            x=(subset["start"] + subset["end"]) / 2,
            y=[cls] * len(subset),
            mode="markers",
            marker=dict(
                symbol="line-ew", size=12, color=color,
                line=dict(width=2, color=color),
            ),
            name=cls.capitalize(),
            text=subset["gene_id"],
            hovertemplate="Gene: %{text}<br>Position: %{x:,.0f}<extra></extra>",
        ))

    short_name = contig_id.split("|")[-1] if "|" in contig_id else contig_id[:30]
    fig.update_layout(
        title=f"Gene Track: {short_name}",
        xaxis_title="Genomic position (bp)",
        yaxis_title="Gene class",
        showlegend=True,
    )

    table_df = contig_genes[["gene_id", "start", "end", "strand", "core_class", "freq_pct"]].sort_values("start")
    return fig, table_df


# ============================================================
# Quest 4 Callbacks
# ============================================================

def get_protein_stats_html(gene_id: str, data: dict) -> str:
    """Get protein stats as HTML."""
    if not gene_id:
        return "<p>Select a gene</p>"

    protein = data["protein"]
    row = protein[protein["gene_id"] == gene_id]
    if len(row) == 0:
        return "<p><i>No protein data available for this gene.</i></p>"

    r = row.iloc[0]
    return (
        f"<div class='stat-card'>"
        f"<p><b>Protein Length:</b> {int(r['protein_length'])} aa</p>"
        f"<p><b>Top Amino Acids:</b> {r['composition_summary']}</p>"
        f"</div>"
    )


def build_backpack_comparison(state: AppState, data: dict) -> go.Figure:
    """Bar chart of protein lengths for backpack genes."""
    if not state or len(state.backpack_genes) < 2:
        fig = go.Figure()
        fig.add_annotation(text="Pin at least 2 genes to compare", showarrow=False)
        return fig

    protein = data["protein"]
    bp_prot = protein[protein["gene_id"].isin(state.backpack_genes)]

    fig = go.Figure(data=[go.Bar(
        x=bp_prot["gene_id"],
        y=bp_prot["protein_length"],
        marker_color="#2E7D32",
        text=bp_prot["protein_length"],
        textposition="auto",
    )])
    fig.update_layout(
        title="Backpack Genes: Protein Length Comparison",
        xaxis_title="Gene",
        yaxis_title="Protein Length (aa)",
    )
    return fig


def build_composition_heatmap(state: AppState, data: dict) -> go.Figure:
    """Heatmap of amino acid composition for backpack genes."""
    if not state or len(state.backpack_genes) < 2:
        fig = go.Figure()
        fig.add_annotation(text="Pin at least 2 genes to compare", showarrow=False)
        return fig

    # Parse composition from summary strings
    protein = data["protein"]
    bp_prot = protein[protein["gene_id"].isin(state.backpack_genes)]

    aa_data = {}
    for _, row in bp_prot.iterrows():
        gene_id = row["gene_id"]
        comp = row["composition_summary"]
        aa_dict = {}
        for item in comp.split(", "):
            parts = item.split(":")
            if len(parts) == 2:
                aa = parts[0].strip()
                pct = float(parts[1].replace("%", ""))
                aa_dict[aa] = pct
        aa_data[gene_id] = aa_dict

    if not aa_data:
        fig = go.Figure()
        fig.add_annotation(text="No composition data", showarrow=False)
        return fig

    df = pd.DataFrame(aa_data).fillna(0).T
    fig = go.Figure(data=go.Heatmap(
        z=df.values,
        x=df.columns.tolist(),
        y=df.index.tolist(),
        colorscale="YlGn",
        colorbar_title="%",
    ))
    fig.update_layout(
        title="Amino Acid Composition Heatmap",
        xaxis_title="Amino Acid",
        yaxis_title="Gene",
    )
    return fig


# ============================================================
# Gene Card Callbacks
# ============================================================

def on_open_gene_card(gene_id: str, state: AppState, data: dict) -> tuple:
    """Open Gene Card side panel."""
    if not gene_id:
        return "", False, state

    state.selected_gene = gene_id
    card = build_gene_card(gene_id, data)
    html = render_gene_card_html(card)
    state.award("Gene Hunter")
    return html, True, state


def on_download_gene_report(state: AppState, data: dict) -> str:
    """Download gene report."""
    if state and state.selected_gene:
        return export_gene_report(state.selected_gene, data)
    return None


# ============================================================
# Final Report Callbacks
# ============================================================

def on_generate_report(state: AppState, data: dict) -> tuple:
    """Generate field report."""
    if state is None:
        state = AppState()
    state.award("Cartographer")
    report_md = generate_field_report(state, data)
    json_path = export_report_json(state, data)
    csv_path = export_report_csv(state, data)

    # Achievement HTML
    badges = " ".join(
        f'<span class="achievement-badge">{a}</span>'
        for a in sorted(state.achievements)
    )
    return (
        report_md,
        gr.File(value=json_path, visible=True),
        gr.File(value=csv_path, visible=True),
        badges,
        state,
    )


# ============================================================
# Data Health
# ============================================================

def build_data_health_html(validation_report: dict) -> str:
    """Build data health HTML from validation report."""
    rows = ""
    for k, v in validation_report.items():
        if isinstance(v, float):
            v = f"{v:.1f}%"
        rows += f"<tr><td><b>{k}</b></td><td>{v}</td></tr>"
    return f"<table style='width:100%'>{rows}</table>"


# Need gr import for Tabs update
import gradio as gr