"""
Visualization utilities for training results.

Generates:
    - Reward curves (line plots)
    - Agent comparison (bar charts)
    - Metrics radar charts
"""

import matplotlib
matplotlib.use("Agg")  # Non-interactive backend

import matplotlib.pyplot as plt
import numpy as np
from typing import Dict, List, Optional


# ─── Style Configuration ─────────────────────────────────────────────────────

COLORS = {
    "Random": "#e74c3c",       # Red
    "Rule-Based": "#3498db",   # Blue
    "Q-Learning": "#2ecc71",   # Green
}

plt.rcParams.update({
    "figure.facecolor": "#1a1a2e",
    "axes.facecolor": "#16213e",
    "axes.edgecolor": "#0f3460",
    "axes.labelcolor": "#e0e0e0",
    "text.color": "#e0e0e0",
    "xtick.color": "#a0a0a0",
    "ytick.color": "#a0a0a0",
    "grid.color": "#0f3460",
    "grid.alpha": 0.5,
    "font.size": 11,
    "font.family": "sans-serif",
})


def _smooth(values: List[float], window: int = 10) -> np.ndarray:
    """Apply a moving average to smooth noisy curves."""
    if len(values) < window:
        return np.array(values)
    kernel = np.ones(window) / window
    return np.convolve(values, kernel, mode="valid")


# ─── Reward Curves ───────────────────────────────────────────────────────────

def plot_rewards(
    agent_rewards: Dict[str, List[float]],
    save_path: str = "logs/reward_curves.png",
    title: str = "Training Reward Curves",
):
    """Plot reward curves for multiple agents.

    Args:
        agent_rewards: Dict mapping agent_name → list of episode rewards.
        save_path: File path to save the plot.
        title: Plot title.
    """
    fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(16, 6))

    # Raw rewards (left)
    for name, rewards in agent_rewards.items():
        color = COLORS.get(name, "#ffffff")
        ax1.plot(rewards, alpha=0.3, color=color, linewidth=0.8)
        smoothed = _smooth(rewards, window=15)
        ax1.plot(
            range(len(rewards) - len(smoothed), len(rewards)),
            smoothed,
            color=color,
            linewidth=2.5,
            label=f"{name} (smoothed)",
        )

    ax1.set_xlabel("Episode")
    ax1.set_ylabel("Total Reward")
    ax1.set_title("Raw + Smoothed Rewards")
    ax1.legend(loc="upper left", framealpha=0.7)
    ax1.grid(True)

    # Cumulative average (right)
    for name, rewards in agent_rewards.items():
        color = COLORS.get(name, "#ffffff")
        cumavg = np.cumsum(rewards) / np.arange(1, len(rewards) + 1)
        ax2.plot(cumavg, color=color, linewidth=2, label=name)

    ax2.set_xlabel("Episode")
    ax2.set_ylabel("Cumulative Average Reward")
    ax2.set_title("Cumulative Average Performance")
    ax2.legend(loc="lower right", framealpha=0.7)
    ax2.grid(True)

    fig.suptitle(title, fontsize=14, fontweight="bold", y=1.02)
    plt.tight_layout()
    plt.savefig(save_path, dpi=150, bbox_inches="tight")
    plt.close()
    print(f"  📊 Saved reward curves → {save_path}")


# ─── Agent Comparison Bar Chart ──────────────────────────────────────────────

def plot_comparison(
    comparison_data: Dict[str, Dict[str, float]],
    save_path: str = "logs/agent_comparison.png",
):
    """Plot a grouped bar chart comparing agent performance.

    Args:
        comparison_data: Dict mapping agent_name → {metric_name → value}.
        save_path: File path to save the plot.
    """
    agents = list(comparison_data.keys())
    metric_names = ["avg_reward", "task_completion", "message_response", "efficiency"]
    metric_labels = ["Avg Reward", "Task Completion", "Msg Response", "Efficiency/100"]

    fig, axes = plt.subplots(1, 4, figsize=(18, 5))

    for idx, (metric, label) in enumerate(zip(metric_names, metric_labels)):
        ax = axes[idx]
        values = [comparison_data[a].get(metric, 0) for a in agents]
        colors = [COLORS.get(a, "#ffffff") for a in agents]

        bars = ax.bar(agents, values, color=colors, edgecolor="#ffffff33", linewidth=0.5)

        # Add value labels on bars
        for bar, val in zip(bars, values):
            ax.text(
                bar.get_x() + bar.get_width() / 2,
                bar.get_height() + max(values) * 0.02,
                f"{val:.2f}",
                ha="center",
                va="bottom",
                fontsize=10,
                fontweight="bold",
            )

        ax.set_title(label, fontsize=12)
        ax.set_ylabel(label)
        ax.tick_params(axis="x", rotation=30)
        ax.grid(axis="y", alpha=0.3)

    fig.suptitle("Agent Comparison", fontsize=14, fontweight="bold", y=1.02)
    plt.tight_layout()
    plt.savefig(save_path, dpi=150, bbox_inches="tight")
    plt.close()
    print(f"  📊 Saved comparison chart → {save_path}")


# ─── Metrics Radar Chart ────────────────────────────────────────────────────

def plot_metrics(
    metrics: Dict[str, float],
    save_path: str = "logs/rl_metrics.png",
    title: str = "Agent Performance Metrics",
):
    """Plot a radar/spider chart of metrics.

    Args:
        metrics: Dict of metric_name → value (0–1 scale or normalized).
        save_path: File path to save the plot.
        title: Plot title.
    """
    # Normalize metrics to 0–1 scale
    display_metrics = {
        "Completion": metrics.get("task_completion_rate", 0),
        "Hi-Priority": metrics.get("high_priority_completion", 0),
        "Msg Response": metrics.get("message_response_rate", 0),
        "Efficiency": metrics.get("efficiency_score", 0) / 100,
        "No Conflicts": max(0, 1 - metrics.get("conflict_count", 0) / 5),
    }

    categories = list(display_metrics.keys())
    values = list(display_metrics.values())

    # Close the radar
    values += [values[0]]
    angles = np.linspace(0, 2 * np.pi, len(categories), endpoint=False).tolist()
    angles += [angles[0]]

    fig, ax = plt.subplots(figsize=(8, 8), subplot_kw=dict(polar=True))

    ax.fill(angles, values, color="#2ecc71", alpha=0.25)
    ax.plot(angles, values, color="#2ecc71", linewidth=2.5, marker="o", markersize=8)

    ax.set_xticks(angles[:-1])
    ax.set_xticklabels(categories, fontsize=12)
    ax.set_ylim(0, 1)
    ax.set_yticks([0.2, 0.4, 0.6, 0.8, 1.0])
    ax.set_yticklabels(["20%", "40%", "60%", "80%", "100%"], fontsize=9)

    # Add value labels
    for angle, value, cat in zip(angles[:-1], values[:-1], categories):
        ax.text(
            angle, value + 0.08, f"{value:.0%}",
            ha="center", va="center", fontsize=10, fontweight="bold",
        )

    ax.set_title(title, fontsize=14, fontweight="bold", pad=20)
    plt.tight_layout()
    plt.savefig(save_path, dpi=150, bbox_inches="tight")
    plt.close()
    print(f"  📊 Saved metrics radar → {save_path}")