"""Diagramme de longévité des personnages (bornes d'apparition)."""

from pathlib import Path
from typing import List

import matplotlib.pyplot as plt

from lib.filesystem import ensure_parent_dir
from lib.rebrickable.stats import read_rows


def load_spans(path: Path) -> List[dict]:
    """Charge le CSV des bornes min/max par personnage."""
    return read_rows(path)


def plot_character_spans(spans_path: Path, destination_path: Path) -> None:
    """Trace un diagramme en barres représentant la longévité des personnages."""
    rows = load_spans(spans_path)
    if not rows:
        return
    characters = [row["known_character"] for row in rows]
    starts = [int(row["start_year"]) for row in rows]
    ends = [int(row["end_year"]) for row in rows]
    counts = [int(row["total_minifigs"]) for row in rows]
    positions = list(range(len(rows)))
    widths = [end - start + 1 for start, end in zip(starts, ends)]
    min_year = min(starts)
    max_year = max(ends)
    height = max(5, len(rows) * 0.3)

    fig, ax = plt.subplots(figsize=(12, height))
    bars = ax.barh(
        positions,
        widths,
        left=starts,
        color="#1f77b4",
        edgecolor="#0d0d0d",
        linewidth=0.6,
    )
    ax.set_yticks(positions)
    ax.set_yticklabels(characters)
    ax.set_xlabel("Années d'apparition")
    ax.set_ylabel("Personnage")
    ax.set_title("Longévité des personnages (première à dernière apparition)")
    ax.set_xlim(min_year - 1, max_year + 1)
    ax.grid(True, axis="x", linestyle="--", alpha=0.25)
    for bar, start, end, count in zip(bars, starts, ends, counts):
        label = f"{start}–{end} ({count})" if start != end else f"{start} ({count})"
        ax.text(
            start + (end - start) / 2,
            bar.get_y() + bar.get_height() / 2,
            label,
            ha="center",
            va="center",
            fontsize=8,
            color="#0d0d0d",
        )

    ensure_parent_dir(destination_path)
    fig.tight_layout()
    fig.savefig(destination_path, dpi=160)
    plt.close(fig)