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

def generate_budget_utilization_gauge_chart(total_budget, total_expense):
    """Generate a gauge chart comparing budget vs. total expense."""

    gauge_steps = [
        {'range': [0, total_budget * 0.7], 'color': '#d4f1dd'},
        {'range': [total_budget * 0.7, total_budget * 0.9], 'color': '#fff2cc'},
        {'range': [total_budget * 0.9, total_budget * 1.2], 'color': '#f8d7da'}
    ]

    gauge_threshold = {
        'line': {'color': 'red', 'width': 4},
        'thickness': 0.75,
        'value': total_budget
    }

    gauge = go.Indicator(
        mode="gauge+number+delta",
        value=total_expense,
        title={'text': "ค่าใช้จ่ายทั้งหมด", 'font': {'size': 24}},
        delta={
            'reference': total_budget,
            'increasing': {'color': 'red', 'symbol': "\u25B2"},
            'decreasing': {'color': 'green', 'symbol': "\u25BC"}
        },
        gauge={
            'axis': {'range': [None, total_budget * 1.2], 'tickwidth': 1},
            'bar': {'color': '#1f77b4'},
            'bgcolor': 'white',
            'borderwidth': 2,
            'bordercolor': 'gray',
            'steps': gauge_steps,
            'threshold': gauge_threshold
        }
    )

    fig = go.Figure(gauge)

    fig.update_layout(
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=300
    )

    return fig

def generate_deliverable_budget_vs_expense_bar_chart(budget_df, expense_df):
    """Generate a grouped bar chart comparing budget vs. actual expense per deliverable."""

    # Calculate total budget per deliverable
    budget_df['total_budget'] = budget_df[['wage', 'materials', 'tools_equipment', 'services', 'misc']].sum(axis=1)
    budget_df['title'] = budget_df.get('title', pd.Series(["Unnamed Deliverable"] * len(budget_df)))

    # Prepare budget summary
    budget_summary = budget_df[['title', 'total_budget']].rename(columns={'title': 'deliverable_title'})

    # Summarize expenses per deliverable
    expense_summary = (
        expense_df.groupby('associated_deliverable_id')['total_payment_amount']
        .sum()
        .reset_index()
    )

    # Map deliverable titles to expenses
    deliverable_titles = budget_df[['deliverable_id', 'title']].drop_duplicates()
    expense_summary = (
        pd.merge(
            expense_summary,
            deliverable_titles,
            left_on='associated_deliverable_id',
            right_on='deliverable_id',
            how='left'
        )
        .rename(columns={
            'title': 'deliverable_title',
            'total_payment_amount': 'spending'
        })
    )

    # Merge budget and expense summaries
    merged_df = pd.merge(
        budget_summary,
        expense_summary[['deliverable_title', 'spending']],
        on='deliverable_title',
        how='left'
    ).fillna({'spending': 0})

    # Create bar chart
    fig = go.Figure()

    fig.add_trace(go.Bar(
        x=merged_df['deliverable_title'],
        y=merged_df['total_budget'],
        name='งบประมาณ',
        marker_color='green'
    ))

    fig.add_trace(go.Bar(
        x=merged_df['deliverable_title'],
        y=merged_df['spending'],
        name='ค่าใช้จ่าย',
        marker_color='red'
    ))

    fig.update_layout(
        title='แผนภูมิเปรียบเทียบงบประมาณและค่าใช้จ่าย',
        barmode='group',
        xaxis_title='การส่งมอบ',
        yaxis_title='จำนวนเงิน (บาท)',
        legend=dict(orientation='h', y=-0.2),
        height=400,
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25)
    )

    return fig

def generate_spending_distribution_pie_chart(expense_df, budget_df):
    """Generate a pie chart showing the distribution of spending by deliverables."""

    # Summarize total spending per deliverable
    spending_summary = (
        expense_df.groupby('associated_deliverable_id')['total_payment_amount']
        .sum()
        .reset_index()
    )

    # Map deliverable titles
    deliverable_titles = budget_df[['deliverable_id', 'title']].drop_duplicates()
    spending_summary = (
        pd.merge(
            spending_summary,
            deliverable_titles,
            left_on='associated_deliverable_id',
            right_on='deliverable_id',
            how='left'
        )
        .rename(columns={
            'title': 'deliverable_title',
            'total_payment_amount': 'amount'
        })
    )

    # Handle missing titles
    spending_summary['deliverable_title'] = spending_summary['deliverable_title'].fillna("Unnamed Deliverable")

    # Create pie chart
    fig = px.pie(
        spending_summary,
        values='amount',
        names='deliverable_title',
        title='ยอดค่าใช้จ่ายของการส่งมอบ',
        color_discrete_sequence=px.colors.qualitative.Set2
    )

    fig.update_traces(
        textinfo='label+value',
        hoverinfo='label+percent',
        textposition='inside',
        insidetextorientation='radial'
    )

    fig.update_layout(
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=400
    )

    return fig

def generate_daily_spending_bar_chart(expense_df):
    """Generate a bar chart showing daily spending amounts."""

    # Prepare date and group by date
    expense_df['transaction_date'] = pd.to_datetime(expense_df['transaction_date']).dt.date
    daily_summary = (
        expense_df.groupby('transaction_date')['total_payment_amount']
        .sum()
        .reset_index()
        .rename(columns={
            'transaction_date': 'date',
            'total_payment_amount': 'amount'
        })
        .sort_values('date')
    )

    # Create bar chart
    fig = go.Figure()

    fig.add_trace(go.Bar(
        x=daily_summary['date'],
        y=daily_summary['amount'],
        name='ค่าใช้จ่ายในแต่ละวัน',
        marker_color='#1f77b4'
    ))

    fig.update_layout(
        title='ค่าใช้จ่ายในแต่ละวัน',
        xaxis_title='วันที่',
        yaxis_title='จำนวนเงิน (บาท)',
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=400
    )

    return fig

def generate_cumulative_spending_line_chart(expense_df):
    """Generate a line chart showing cumulative spending over time."""

    # Convert to date and summarize spending per day
    expense_df['transaction_date'] = pd.to_datetime(expense_df['transaction_date']).dt.date
    daily_summary = (
        expense_df.groupby('transaction_date')['total_payment_amount']
        .sum()
        .reset_index()
        .rename(columns={'transaction_date': 'date', 'total_payment_amount': 'amount'})
        .sort_values('date')
    )

    # Calculate cumulative spending
    daily_summary['cumulative_amount'] = daily_summary['amount'].cumsum()

    # Create line chart
    fig = go.Figure()

    fig.add_trace(go.Scatter(
        x=daily_summary['date'],
        y=daily_summary['cumulative_amount'],
        mode='lines+markers',
        name='Cumulative Spending',
        marker_color='#ff7f0e'
    ))

    fig.update_layout(
        title='ยอดค่าใช้จ่ายสะสมตามช่วงเวลา',
        xaxis_title='วันที่',
        yaxis_title='ยอดค่าใช้จ่ายสะสม (บาท)',
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=400
    )

    return fig

def generate_risk_level_distribution_pie_chart(deliverable_df):
    """Generate a pie chart showing the distribution of deliverables by risk level."""

    risk_summary = (
        deliverable_df['risk_level']
        .value_counts()
        .reset_index(name='count')
        .rename(columns={'index': 'risk_level'})
    )

    risk_color_map = {
        'green': '#28a745',
        'yellow': '#ffc107',
        'red': '#dc3545',
        'unknown': '#6c757d'
    }

    fig = px.pie(
        risk_summary,
        values='count',
        names='risk_level',
        title='แผนภูมิระดับความเสี่ยง',
        color='risk_level',
        color_discrete_map=risk_color_map
    )

    fig.update_traces(
        textinfo='label+percent',
        hoverinfo='label+value+percent',
        textposition='inside'
    )

    fig.update_layout(
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=400
    )

    return fig

def generate_deliverable_timeline_gantt_chart(deliverable_df):
    """Generate a Gantt chart showing deliverables over time, colored by risk level."""

    df = deliverable_df.copy()

    # Ensure proper date format
    df['start_date'] = pd.to_datetime(df['start_date'])
    df['end_date'] = pd.to_datetime(df['end_date'])

    # Fill missing values
    df['title'] = df['title'].fillna("Unnamed Deliverable")
    df['risk_level'] = df['risk_level'].fillna("unknown")  # lowercase to match color map

    # Rename columns for display
    df = df.rename(columns={
        'title': 'หัวข้อ',
        'risk_level': 'ระดับความเสี่ยง'
    })

    risk_color_map = {
        'green': '#28a745',
        'yellow': '#ffc107',
        'red': '#dc3545',
        'unknown': '#6c757d'
    }

    # Create Gantt chart
    fig = px.timeline(
        df,
        x_start='start_date',
        x_end='end_date',
        y='หัวข้อ',
        color='ระดับความเสี่ยง',
        title='ไทม์ไลน์การส่งมอบ (Gantt Chart)',
        hover_data=['status', 'risk_level_rationale'],
        color_discrete_map=risk_color_map
    )

    # Reverse Y-axis to have earliest on top
    fig.update_yaxes(autorange='reversed')

    # Layout customization
    fig.update_layout(
        paper_bgcolor='rgba(0,0,0,0)',
        plot_bgcolor='rgba(0,0,0,0)',
        margin=dict(t=50, r=25, l=25, b=25),
        height=500
    )

    return fig

def render_deliverable_summary_cards(deliverable_df):
    """Render HTML cards for deliverables with expandable risk rationale using <details>/<summary> (JS-free, Gradio-safe)."""

    def format_date(date_str):
        if pd.isna(date_str):
            return "-"
        return pd.to_datetime(date_str).strftime("%d %b %Y")

    risk_level_colors = {
        "green": "#28a745",
        "yellow": "#ffc107",
        "red": "#dc3545",
        "unknown": "#6c757d"
    }

    status_colors = {
        "ongoing": "#17a2b8",
        "done": "#007bff",
    }

    cards_html = """
    <div style='display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px;'>
    """

    for _, row in deliverable_df.iterrows():
        title = row.get('title', 'Untitled Deliverable')
        deliverable_id = row.get('deliverable_id', '-')
        status = str(row.get('status', 'N/A')).lower()
        risk_level = str(row.get('risk_level', 'unknown')).lower()
        rationale = row.get('risk_level_rationale', 'No rationale provided')

        status_color = status_colors.get(status, "#6c757d")
        risk_color = risk_level_colors.get(risk_level, "#6c757d")

        status_map = {
            'done': 'เสร็จสิ้น',
            'ongoing': 'กำลังดำเนินการ'
        }

        thai_status = status_map.get(status, 'ไม่ทราบสถานะ')

        start_date = format_date(row.get('start_date'))
        end_date = format_date(row.get('end_date'))

        cards_html += f"""
        <div style='border: 1px solid #dee2e6; border-radius: 10px; padding: 15px; background-color: #ffffff; box-shadow: 0 2px 6px rgba(0,0,0,0.05);'>
            <div style='font-weight: bold; font-size: 1.1em; margin-bottom: 5px;'>
                {title}
                <div style='font-size: 0.85em; color: #6c757d;'>ID: {deliverable_id}</div>
            </div>
            <div style='margin: 8px 0;'>
                <span style='padding: 3px 8px; border-radius: 4px; font-size: 0.75em; background-color: {status_color}; color: white; margin-right: 5px;'>
                    {thai_status}
                </span>
                <span style='padding: 3px 8px; border-radius: 4px; font-size: 0.75em; background-color: {risk_color}; color: white;'>
                    ระดับความเสี่ยง: {risk_level.capitalize()}
                </span>
            </div>
            <div style='font-size: 0.9em; color: #6c757d;'>
                <strong>เริ่มต้น:</strong> {start_date}<br>
                <strong>สิ้นสุด:</strong> {end_date}
            </div>
            <details style='margin-top: 12px; font-size: 0.85em; color: #495057;'>
                <summary style='cursor: pointer; color: #007bff;'>แสดงเหตุผลของความเสี่ยง</summary>
                <div style='margin-top: 6px; padding: 8px; background-color: #f8f9fa; border-radius: 5px; border: 1px solid #dee2e6;'>
                    <strong>เหตุผลของความเสี่ยง:</strong><br>{rationale}
                </div>
            </details>
        </div>
        """

    cards_html += "</div>"
    return cards_html