import pandas as pd
from dash import html, dcc
from dash_iconify import DashIconify
import dash_mantine_components as dmc
import base64
import countryflag

button_style = {
    "display": "inline-block",
    "marginBottom": "10px",
    "marginRight": "15px",
    "marginTop": "30px",
    "padding": "6px 16px",
    "backgroundColor": "#082030",
    "color": "white",
    "borderRadius": "6px",
    "textDecoration": "none",
    "fontWeight": "bold",
    "fontSize": "14px",
}

company_icon_map = {
    "google": "../assets/icons/google.png",
    "distilbert": "../assets/icons/hugging-face.png",
    "sentence-transformers": "../assets/icons/hugging-face.png",
    "facebook": "../assets/icons/meta.png",
    "openai": "../assets/icons/openai.png",
}

country_emoji_fallback = {
    "User": "👤",
    "Organization": "🏢",
    "Model": "📦",
}

meta_cols_map = {
    "org_country_single": ["org_country_single"],
    "author": ["org_country_single", "author", "merged_country_groups_single"],
    "derived_author": ["org_country_single", "derived_author", "merged_country_groups_single"],
    "model": [
        "org_country_single",
        "author",
        "derived_author",
        "merged_country_groups_single",
        "merged_modality",
        "total_downloads",
    ],
}


# Chip renderer
def chip(text, bg_color="#F0F0F0"):
    return html.Span(
        text,
        style={
            "backgroundColor": bg_color,
            "padding": "4px 10px",
            "borderRadius": "12px",
            "margin": "2px",
            "display": "inline-flex",
            "alignItems": "center",
            "fontSize": "14px",
        },
    )


# Progress bar for % of total
def progress_bar(percent, bar_color="#AC482A"):
    return html.Div(
        style={
            "position": "relative",
            "backgroundColor": "#E0E0E0",
            "borderRadius": "8px",
            "height": "20px",
            "width": "100%",
            "overflow": "hidden",
        },
        children=[
            html.Div(
                style={
                    "backgroundColor": bar_color,
                    "width": f"{percent}%",
                    "height": "100%",
                    "borderRadius": "8px",
                    "transition": "width 0.5s",
                }
            ),
            html.Div(
                f"{percent:.1f}%",
                style={
                    "position": "absolute",
                    "top": 0,
                    "left": "50%",
                    "transform": "translateX(-50%)",
                    "color": "black",
                    "fontWeight": "bold",
                    "fontSize": "12px",
                    "lineHeight": "20px",
                    "textAlign": "center",
                },
            ),
        ],
    )


# Helper to convert DataFrame to CSV and encode for download
def df_to_download_link(df, filename):
    csv_string = df.to_csv(index=False)
    b64 = base64.b64encode(csv_string.encode()).decode()
    return html.Div(
        html.A(
            children=dmc.ActionIcon(
                DashIconify(icon="mdi:download", width=24),
                size="lg",
                color="#082030",
            ),
            id=f"download-{filename}",
            download=f"{filename}.csv",
            href=f"data:text/csv;base64,{b64}",
            target="_blank",
            title="Download CSV",
            style={
                "padding": "6px 12px",
                "display": "inline-flex",
                "alignItems": "center",
                "justifyContent": "center",
            },
        ),
        style={"textAlign": "right"},
    )


# Helper to get popover content for each metadata type
def get_metadata_popover_content(icon, name, meta_type):
    popover_texts = {
        "country": f"Country: {name}",
        "author": f"Author/Organization: {name}",
        "downloads": f"Total downloads: {name}",
        "modality": f"Modality: {name}",
        "parameters": f"Estimated parameters: {name}",
    }
    return popover_texts.get(meta_type, name)


# Chip renderer with hovercard
def chip_with_hovercard(text, bg_color="#F0F0F0", meta_type=None, icon=None):
    hovercard_content = get_metadata_popover_content(icon, text, meta_type)
    return dmc.HoverCard(
        width=220,
        shadow="md",
        position="top",
        children=[
            dmc.HoverCardTarget(
                html.Span(
                    text,
                    style={
                        "backgroundColor": bg_color,
                        "padding": "4px 10px",
                        "borderRadius": "12px",
                        "margin": "2px",
                        "display": "inline-flex",
                        "alignItems": "center",
                        "fontSize": "14px",
                        "cursor": "pointer",
                    },
                )
            ),
            dmc.HoverCardDropdown(
                dmc.Text(hovercard_content, size="sm")
            ),
        ],
    )


# Render multiple chips in one row, each with popover
def render_chips(metadata_list, chip_color):
    chips = []
    for icon, name, meta_type in metadata_list:
        if isinstance(icon, str) and icon.endswith((".png", ".jpg", ".jpeg", ".svg")):
            chips.append(
                dmc.HoverCard(
                    width=220,
                    shadow="md",
                    position="top",
                    children=[
                        dmc.HoverCardTarget(
                            html.Span(
                                [
                                    html.Img(
                                        src=icon, style={"height": "18px", "marginRight": "6px"}
                                    ),
                                    name,
                                ],
                                style={
                                    "backgroundColor": chip_color,
                                    "padding": "4px 10px",
                                    "borderRadius": "12px",
                                    "margin": "2px",
                                    "display": "inline-flex",
                                    "alignItems": "left",
                                    "fontSize": "14px",
                                    "cursor": "pointer",
                                },
                            )
                        ),
                        dmc.HoverCardDropdown(
                            dmc.Text(get_metadata_popover_content(icon, name, meta_type), size="sm")
                        ),
                    ],
                )
            )
        else:
            chips.append(chip_with_hovercard(f"{icon} {name}", chip_color, meta_type, icon))
    return html.Div(
        chips, style={"display": "flex", "flexWrap": "wrap", "justifyContent": "left"}
    )


def render_table_content(
    df, download_df, chip_color, bar_color="#AC482A", filename="data"
):
    return html.Div(
        [
            # Add download button above the table
            df_to_download_link(download_df, filename),
            html.Table(
                [
                    html.Thead(
                        html.Tr(
                            [
                                html.Th(
                                    "Rank",
                                    style={
                                        "backgroundColor": "#F0F0F0",
                                        "textAlign": "left",
                                    },
                                ),
                                html.Th(
                                    "Name",
                                    style={
                                        "backgroundColor": "#F0F0F0",
                                        "textAlign": "left",
                                    },
                                ),
                                html.Th(
                                    "Metadata",
                                    style={
                                        "backgroundColor": "#F0F0F0",
                                        "textAlign": "left",
                                        "marginRight": "10px",
                                    },
                                ),
                                html.Th(
                                    "% of Total",
                                    style={
                                        "backgroundColor": "#F0F0F0",
                                        "textAlign": "left",
                                    },
                                ),
                            ]
                        )
                    ),
                    html.Tbody(
                        [
                            html.Tr(
                                [
                                    html.Td(idx + 1, style={"textAlign": "center"}),
                                    html.Td(row["Name"], style={"textAlign": "left"}),
                                    html.Td(render_chips(row["Metadata"], chip_color)),
                                    html.Td(
                                        progress_bar(row["% of total"], bar_color),
                                        style={"textAlign": "center"},
                                    ),
                                ]
                            )
                            for idx, row in df.iterrows()
                        ]
                    ),
                ],
                style={"borderCollapse": "collapse", "width": "100%"},
            ),
        ]
    )

# Function to get top N leaderboard (now accepts pandas DataFrame from DuckDB query)
def get_top_n_leaderboard(filtered_df, group_col, top_n=10, derived_author_toggle=True):
    """
    Get top N entries for a leaderboard
    
    Args:
        filtered_df: Pandas DataFrame (already filtered by time from DuckDB query)
        group_col: Column to group by
        top_n: Number of top entries to return
        derived_author_toggle: Whether to use derived_author or author column
        
    Returns:
        tuple: (display_df, download_df)
    """

    # Group by and get top N
    top = (
        filtered_df.groupby(group_col)[["total_downloads", "percent_of_total"]]
        .sum()
        .nlargest(top_n, columns="total_downloads")
        .reset_index()
        .rename(columns={group_col: "Name", "total_downloads": "Total Value", "percent_of_total": "% of total"})
    )

    # Create a downloadable version of the leaderboard
    download_top = top.copy()
    download_top["Total Value"] = download_top["Total Value"].astype(int)
    download_top["% of total"] = download_top["% of total"].round(2)

    # Replace "User" in names
    top["Name"] = top["Name"].replace("User", "user")

    # All relevant metadata columns
    meta_cols = meta_cols_map.get(group_col, [])
    
    # Collect all metadata per top n for each category (country, author, model)
    meta_map = {}
    download_map = {}
    
    for name in top["Name"]:
        name_data = filtered_df[filtered_df[group_col] == name]
        meta_map[name] = {}
        download_map[name] = {}
        for col in meta_cols:
            if col in name_data.columns:
                unique_vals = name_data[col].unique()
                meta_map[name][col] = list(unique_vals)
                download_map[name][col] = list(unique_vals)

    # Function to build metadata chips
    def build_metadata(nm):
        meta = meta_map.get(nm, {})
        chips = []
        
        # Countries
        for c in meta.get("org_country_single", []):
            if c == "United States of America":
                c = "USA"
            if c == "user":
                c = "User"
            # Try countryflag.getflag(), fallback to dictionary if fails
            try:
                flag_emoji = countryflag.getflag(c)
                # If countryflag returns empty or None, fallback
                if not flag_emoji or flag_emoji == c:
                    flag_emoji = country_emoji_fallback.get(c, "🌍")
            except Exception:
                flag_emoji = country_emoji_fallback.get(c, "🌍")
            chips.append((flag_emoji, c, "country"))
        
        # Author - use derived_author_toggle to determine which column
        author_key = "derived_author" if derived_author_toggle else "author"
        for a in meta.get(author_key, []):
            icon = company_icon_map.get(a, "")
            if icon == "":
                if meta.get("merged_country_groups_single", ["User"])[0] != "User":
                    icon = "🏢"
                else:
                    icon = "👤"
            chips.append((icon, a, "author"))
        
        # Downloads
        total_downloads = sum(
            d for d in meta.get("total_downloads", []) if pd.notna(d)
        )
        if total_downloads:
            chips.append(("⬇️", f"{int(total_downloads):,}", "downloads"))

        # Modality
        for m in meta.get("merged_modality", []):
            if pd.notna(m):
                chips.append(("", m, "modality"))
        
        return chips

    # Function to create downloadable dataframe metadata
    def build_download_metadata(nm):
        meta = download_map.get(nm, {})
        download_info = {}
        
        for col in meta_cols:
            if col not in meta or not meta[col]:
                continue
            
            vals = meta.get(col, [])
            if vals:
                download_info[col] = ", ".join(str(v) for v in vals if pd.notna(v))
            else:
                download_info[col] = ""
        
        return download_info

    # Apply metadata builder to top dataframe
    top["Metadata"] = top["Name"].astype(object).apply(build_metadata)
    
    # Build download dataframe with metadata
    download_info_list = [build_download_metadata(nm) for nm in download_top["Name"]]
    download_info_df = pd.DataFrame(download_info_list)
    download_top = pd.concat([download_top, download_info_df], axis=1)

    return top[["Name", "Metadata", "% of total"]], download_top


def get_top_n_from_duckdb(con, group_col, top_n=10, time_filter=None, view="all_downloads"):
    """
    Query DuckDB directly to get top N entries with minimal data transfer
    
    Args:
        con: DuckDB connection object
        group_col: Column to group by
        top_n: Number of top entries
        time_filter: Optional tuple of (start_timestamp, end_timestamp)
        
    Returns:
        Pandas DataFrame with only the rows needed for top N
    """
    # Build time filter clause
    time_clause = ""
    if time_filter:
        start = pd.to_datetime(time_filter[0], unit="s")
        end = pd.to_datetime(time_filter[1], unit="s")
        time_clause = f"WHERE time >= '{start}' AND time <= '{end}'"
    
    # Optimized query: first find top N, then get only those rows
    query = f"""
    WITH base_data AS (
        SELECT 
            {group_col},
            CASE 
                WHEN org_country_single IN ('HF', 'United States of America') THEN 'United States of America'
                WHEN org_country_single IN ('International', 'Online') THEN 'International/Online'
                ELSE org_country_single
            END AS org_country_single,
            author,
            derived_author,
            merged_country_groups_single,
            merged_modality,
            downloads,
            model
        FROM {view}
        {time_clause}
    ),

    -- Compute the total downloads for all rows in the time range
    total_downloads_cte AS (
        SELECT SUM(downloads) AS total_downloads_all
        FROM base_data
    ),

    -- Compute per-group totals and their percentage of all downloads
    top_items AS (
        SELECT 
            b.{group_col} AS name,
            SUM(b.downloads) AS total_downloads,
            ROUND(SUM(b.downloads) * 100.0 / t.total_downloads_all, 2) AS percent_of_total,
            -- Pick first non-null metadata values for reference
            ANY_VALUE(b.org_country_single) AS org_country_single,
            ANY_VALUE(b.author) AS author,
            ANY_VALUE(b.derived_author) AS derived_author,
            ANY_VALUE(b.merged_country_groups_single) AS merged_country_groups_single,
            ANY_VALUE(b.merged_modality) AS merged_modality,
            ANY_VALUE(b.model) AS model
        FROM base_data b
        CROSS JOIN total_downloads_cte t
        GROUP BY b.{group_col}, t.total_downloads_all
    )

    SELECT *
    FROM top_items
    ORDER BY total_downloads DESC
    LIMIT {top_n};
    """

    try:
        return con.execute(query).fetchdf()
    except Exception as e:
        print(f"Error querying DuckDB: {e}")
        return pd.DataFrame()