#!/usr/bin/env python
# Matplotlib ships only partial type stubs, so strict checking is pure noise here.
# pyright: basic
"""Generate the SCP dataset's statistics showcase: charts (PNG) + tables + conclusions.

Reads the DuckDB database, writes chart images to `<images>/` and a single Markdown
report (`STATISTICS.md`) that embeds every chart and table alongside the conclusion it
supports. Re-running overwrites the outputs.

Usage (run from the src/ directory, like scp_dataset.py):
    python generate_report.py
    python generate_report.py --db ../data/scp_dataset.duckdb --images ../images \
        --report ../STATISTICS.md
"""

from __future__ import annotations

import argparse
import itertools
import logging
from pathlib import Path
from typing import TYPE_CHECKING

import duckdb
import matplotlib as mpl
import numpy as np

mpl.use("Agg")  # headless: render to files, never a window.
import matplotlib.pyplot as plt

if TYPE_CHECKING:
    from matplotlib.axes import Axes
    from matplotlib.figure import Figure

DEFAULT_DB = "../data/scp_dataset.duckdb"
DEFAULT_IMAGES = "../images"
DEFAULT_REPORT = "../STATISTICS.md"

CAPTION = "SCP Wiki content pages · 2008–2026 · n = 19,438 · via Crom"

# Placeholder/institutional credit names to drop from author stats.
_PLACEHOLDERS = "('Anonymous', 'Unknown Author', 'Staff', 'Site News Team')"

# Shared TEMP views (registered in main()): `credits` is one row per attribution credit;
# `page_authors` applies the all-authors rule — AUTHOR credits where present, else the
# page's submitter/poster — so co-authors count and every page is attributed.
_VIEWS_SQL = f"""
CREATE TEMP VIEW credits AS
SELECT p.url, p.rating, p.title, p.created_at,
       p.created_by_display_name AS poster,
       a.type AS role, a.user_display_name AS name
FROM pages p,
     unnest(from_json(p.attributions,
       '[{{"type":"VARCHAR","user_display_name":"VARCHAR","date":"VARCHAR","order":"INTEGER"}}]'
     )) AS t(a);

CREATE TEMP VIEW page_authors AS
WITH ac AS (
    SELECT DISTINCT url, name AS author FROM credits
    WHERE role = 'AUTHOR' AND name NOT IN {_PLACEHOLDERS}
)
SELECT url, author FROM ac
UNION
SELECT p.url, p.created_by_display_name FROM pages p
WHERE p.created_by_display_name IS NOT NULL
  AND p.created_by_display_name NOT IN {_PLACEHOLDERS}
  AND p.url NOT IN (SELECT url FROM ac);
"""

# Palette.
INK, SUBINK, MUTED, GRID = "#222222", "#555555", "#9a9a9a", "#ececec"
ACCENT, ACCENT2 = "#a01722", "#2f6f9f"
SERIES = [ACCENT, ACCENT2, "#c98a2b", "#4f8a5b", "#7a5195", "#5a5a5a", "#d45087"]

# Tags that describe structure/meta rather than content themes; excluded from "themes".
_NON_THEME = (
    "scp",
    "tale",
    "hub",
    "goi-format",
    "essay",
    "supplement",
    "admin",
    "guide",
    "collaboration",
    "contest",
    "interview",
    "poetry",
    "artwork",
    "co-authored",
    "featured",
    "rewrite",
    "safe",
    "euclid",
    "keter",
    "thaumiel",
    "neutralized",
    "explained",
    "apollyon",
    "archon",
    "esoteric-class",
    "pending",
    "decommissioned",
)

logger = logging.getLogger("generate_report")


# --- Style + small helpers ------------------------------------------------------------


def setup_style() -> None:
    """Apply a clean, consistent matplotlib look."""
    plt.rcParams.update(
        {
            "savefig.dpi": 150,
            "figure.facecolor": "white",
            "axes.facecolor": "white",
            "axes.edgecolor": "#cccccc",
            "axes.linewidth": 0.8,
            "axes.titlesize": 14,
            "axes.titleweight": "bold",
            "axes.titlecolor": INK,
            "axes.labelcolor": SUBINK,
            "axes.grid": True,
            "axes.axisbelow": True,
            "grid.color": GRID,
            "grid.linewidth": 0.9,
            "xtick.color": SUBINK,
            "ytick.color": SUBINK,
            "text.color": INK,
            "font.size": 11,
            "legend.frameon": False,
        }
    )


def _style_axes(ax: Axes, title: str) -> None:
    """Despine, left-align the title, and add the dataset caption."""
    for side in ("top", "right"):
        ax.spines[side].set_visible(False)

    ax.set_title(title, loc="left", pad=12)
    ax.figure.text(0.005, 0.005, CAPTION, fontsize=7.5, color=MUTED, ha="left")


def _save(fig: Figure, images_dir: Path, name: str) -> str:
    """Write a figure and return its repo-relative path for Markdown embedding."""
    fig.savefig(images_dir / f"{name}.png", bbox_inches="tight")
    plt.close(fig)

    return f"images/{name}.png"


def _section(title: str, body: str, takeaway: str) -> str:
    """Assemble one Markdown section: heading, body (image or table), conclusion."""
    return f"## {title}\n\n{body}\n\n**Takeaway.** {takeaway}\n"


def _img(title: str, path: str, takeaway: str) -> str:
    return _section(title, f"![{title}]({path})", takeaway)


def _md_table(headers: list[str], rows: list[list[str]]) -> str:
    """Render a Markdown table; cell pipes are escaped so titles can't break columns."""

    def row(cells: list[str]) -> str:
        return "| " + " | ".join(c.replace("|", r"\|") for c in cells) + " |"

    rule = "| " + " | ".join("---" for _ in headers) + " |"
    return "\n".join([row(headers), rule, *(row(r) for r in rows)])


# --- Charts ---------------------------------------------------------------------------


def chart_pages_per_year(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Stacked bar of pages created per year, split SCP / Tale / Other."""
    rows = con.execute("""
        WITH typed AS (
            SELECT p.url, year(p.created_at) AS yr,
                max(t.tag = 'scp')::int  AS is_scp,
                max(t.tag = 'tale')::int AS is_tale
            FROM pages p LEFT JOIN page_tags t ON t.page_url = p.url
            GROUP BY p.url, yr)
        SELECT yr, count(*) AS total, sum(is_scp) AS scp, sum(is_tale) AS tale
        FROM typed GROUP BY yr ORDER BY yr
    """).fetchall()
    years = [r[0] for r in rows]
    scp = np.array([r[2] for r in rows])
    tale = np.array([r[3] for r in rows])
    other = np.array([r[1] for r in rows]) - scp - tale

    fig, ax = plt.subplots(figsize=(10, 5.2))

    ax.bar(years, scp, label="SCP", color=ACCENT)
    ax.bar(years, tale, bottom=scp, label="Tale", color=ACCENT2)
    ax.bar(years, other, bottom=scp + tale, label="Other", color="#c9b79c")
    ax.set_ylabel("pages created")
    ax.legend(loc="upper left")
    ax.margins(x=0.01)
    ax.set_xticks(range(min(years), max(years) + 1, 2))

    _style_axes(ax, "Content created per year")

    peak = years[int(np.argmax(scp + tale + other))]
    total = int((scp + tale + other).sum())
    takeaway = (
        f"The wiki grew from 298 pages in 2008 to a peak around {peak}, "
        f"{total:,} in all. SCPs are the backbone but tales now make up roughly a "
        "third of yearly output; 2026 is a partial year."
    )

    return _img(
        "Content created per year",
        _save(fig, images, "pages_per_year"),
        takeaway,
    )


def chart_object_classes(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Bar of object-class counts."""
    classes = (
        "safe",
        "euclid",
        "keter",
        "thaumiel",
        "neutralized",
        "explained",
        "apollyon",
        "archon",
        "esoteric-class",
        "pending",
        "decommissioned",
    )
    rows = con.execute(
        "SELECT tag, count(*) n FROM page_tags WHERE tag = ANY($c) GROUP BY tag",
        {"c": list(classes)},
    ).fetchall()

    counts = dict(rows)
    labels = [c for c in classes if c in counts]
    values = [counts[c] for c in labels]
    order = np.argsort(values)
    labels = [labels[i] for i in order]
    values = [values[i] for i in order]

    fig, ax = plt.subplots(figsize=(9, 5))

    bars = ax.barh(labels, values, color=ACCENT)
    ax.bar_label(bars, padding=4, fmt="{:,.0f}", color=SUBINK, fontsize=9)
    ax.set_xlabel("pages")
    ax.margins(x=0.12)

    _style_axes(ax, "Object classes")

    takeaway = (
        f"Euclid ('anomalous but containable') is the plurality at {counts['euclid']:,}, "
        f"just ahead of Safe ({counts['safe']:,}); Keter is a distant third. The catch-all "
        "'esoteric-class' has overtaken every named class except the big three."
    )

    return _img(
        "Object classes",
        _save(fig, images, "object_classes"),
        takeaway,
    )


def _theme_tags(con: duckdb.DuckDBPyConnection, limit: int) -> list[tuple[str, int]]:
    """Top content-theme tags (excluding meta, structural, and class tags)."""
    return con.execute(
        r"""
        SELECT tag, count(*) n FROM page_tags
        WHERE tag NOT LIKE '\_%' ESCAPE '\' AND tag NOT LIKE 'crom:%'
          AND NOT (tag = ANY($x))
        GROUP BY tag ORDER BY n DESC LIMIT $k
        """,
        {"x": list(_NON_THEME), "k": limit},
    ).fetchall()


def chart_top_themes(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Horizontal bar of the most common theme tags."""
    rows = _theme_tags(con, 15)
    labels = [r[0] for r in rows][::-1]
    values = [r[1] for r in rows][::-1]

    fig, ax = plt.subplots(figsize=(9, 6))

    bars = ax.barh(labels, values, color=ACCENT2)
    ax.bar_label(bars, padding=4, fmt="{:,.0f}", color=SUBINK, fontsize=9)
    ax.set_xlabel("pages tagged")
    ax.margins(x=0.12)

    _style_axes(ax, "Most common themes")

    takeaway = (
        f"Entity descriptors dominate — '{rows[0][0]}', '{rows[1][0]}' and '{rows[2][0]}' "
        "lead — followed by genre tags like horror and mind-affecting. Comedy ranks "
        "surprisingly high, a reminder the wiki is not all grimdark."
    )

    return _img(
        "Most common themes",
        _save(fig, images, "top_themes"),
        takeaway,
    )


def chart_rating_distribution(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Histogram of ratings on a symlog x-axis (covers negatives and the long tail)."""
    ratings = np.array(
        [
            r[0]
            for r in con.execute(
                "SELECT rating FROM pages WHERE rating IS NOT NULL"
            ).fetchall()
        ]
    )
    bins = np.concatenate(
        [[-200, -50, -10, 0], np.logspace(np.log10(10), np.log10(11000), 45)]
    )

    fig, ax = plt.subplots(figsize=(10, 5))

    ax.hist(ratings, bins=bins.tolist(), color=ACCENT, edgecolor="white", linewidth=0.3)
    ax.set_xscale("symlog", linthresh=10)
    ax.set_yscale("log")
    ax.set_xlabel("rating (net votes, symlog)")
    ax.set_ylabel("pages (log)")

    median = float(np.median(ratings))

    ax.axvline(median, color=INK, linestyle="--", linewidth=1)
    ax.text(
        median * 1.1,
        ax.get_ylim()[1] * 0.5,
        f"median {median:.0f}",
        color=INK,
        fontsize=9,
    )

    _style_axes(ax, "Rating distribution")

    neg = int((ratings < 0).sum())
    takeaway = (
        f"Ratings are extremely right-skewed: a median of {median:.0f} against a maximum of "
        f"{ratings.max():,.0f} (SCP-173). Only {neg} pages sit below zero — the community "
        "deletes weak work, so what remains is heavily curated."
    )

    return _img(
        "Rating distribution",
        _save(fig, images, "rating_distribution"),
        takeaway,
    )


def chart_length_distribution(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Histogram of article (source) length on a log x-axis."""
    lengths = np.array(
        [
            r[0]
            for r in con.execute(
                "SELECT length(source) FROM pages WHERE source IS NOT NULL AND length(source) > 0"
            ).fetchall()
        ]
    )
    bins = np.logspace(np.log10(lengths.min()), np.log10(lengths.max()), 50)

    fig, ax = plt.subplots(figsize=(10, 5))

    ax.hist(
        lengths, bins=bins.tolist(), color="#4f8a5b", edgecolor="white", linewidth=0.3
    )
    ax.set_xscale("log")
    ax.set_xlabel("source length (characters, log)")
    ax.set_ylabel("pages")

    median = float(np.median(lengths))

    ax.axvline(median, color=INK, linestyle="--", linewidth=1)
    ax.text(
        median * 1.1,
        ax.get_ylim()[1] * 0.9,
        f"median {median:,.0f} chars",
        color=INK,
        fontsize=9,
    )

    _style_axes(ax, "Article length")

    takeaway = (
        f"Article length is roughly log-normal around a median of {median:,.0f} characters "
        f"(a few pages of text), with a long tail of giant hubs and anthologies reaching "
        f"{lengths.max():,.0f} characters."
    )

    return _img(
        "Article length",
        _save(fig, images, "length_distribution"),
        takeaway,
    )


def chart_author_pareto(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Lorenz curve of how unequally pages are distributed across authors."""
    counts = np.array(
        sorted(
            r[0]
            for r in con.execute(
                "SELECT count(*) FROM page_authors GROUP BY author"
            ).fetchall()
        )
    )
    cum = np.cumsum(counts) / counts.sum()
    frac_authors = np.arange(1, len(counts) + 1) / len(counts)
    desc = counts[::-1]
    top2 = desc[: max(1, len(desc) // 50)].sum() / counts.sum()
    solo = int((counts == 1).sum())

    fig, ax = plt.subplots(figsize=(7.5, 6.5))

    ax.plot(
        [0, 1],
        [0, 1],
        color=MUTED,
        linestyle="--",
        linewidth=1,
        label="perfect equality",
    )
    ax.plot(frac_authors, cum, color=ACCENT, linewidth=2.2, label="actual")
    ax.fill_between(frac_authors, cum, frac_authors, color=ACCENT, alpha=0.08)
    ax.set_xlabel("share of authors (least to most prolific)")
    ax.set_ylabel("share of pages")
    ax.set_xlim(0, 1)
    ax.set_ylim(0, 1)
    ax.legend(loc="upper left")

    _style_axes(ax, "Authorship is a power law")

    takeaway = (
        "Counting every credited author (not just whoever posted the page), contribution is "
        f"steeply unequal: the most prolific 2% hold {top2:.0%} of all author credits, while "
        f"{solo:,} authors have a single credit. A small core sustains the wiki."
    )

    return _img(
        "Authorship is a power law",
        _save(fig, images, "author_pareto"),
        takeaway,
    )


def chart_rating_vs_length(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Scatter of rating vs article length, with the (flat) trend."""
    rows = con.execute(
        "SELECT length(source), rating FROM pages "
        "WHERE rating > 0 AND source IS NOT NULL AND length(source) > 0"
    ).fetchall()
    length = np.array([r[0] for r in rows])
    rating = np.array([r[1] for r in rows])
    r = float(np.corrcoef(length, rating)[0, 1])

    fig, ax = plt.subplots(figsize=(9, 6))

    ax.scatter(length, rating, s=6, alpha=0.18, color=ACCENT, edgecolors="none")
    ax.set_xscale("log")
    ax.set_yscale("log")
    ax.set_xlabel("source length (characters, log)")
    ax.set_ylabel("rating (log, positive-rated pages)")

    # Median rating per length-decile, to show the flat relationship clearly.
    edges = np.logspace(np.log10(length.min()), np.log10(length.max()), 11)
    centers, meds = [], []
    for lo, hi in itertools.pairwise(edges):
        sel = (length >= lo) & (length < hi)
        if sel.any():
            centers.append((lo * hi) ** 0.5)
            meds.append(np.median(rating[sel]))

    ax.plot(
        centers,
        meds,
        color=INK,
        linewidth=2,
        marker="o",
        markersize=4,
        label="median by length",
    )
    ax.legend(loc="upper left")

    _style_axes(ax, "Does length buy quality? No.")

    takeaway = (
        f"Rating and article length are essentially uncorrelated (r = {r:.02f}). The median "
        "rating is flat across the whole length range — a longer article is not a "
        "better-rated one. Concept and execution, not word count, drive a page's score."
    )

    return _img(
        "Does length buy quality? No.",
        _save(fig, images, "rating_vs_length"),
        takeaway,
    )


def chart_rating_by_year(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Line chart of mean and median rating per creation year."""
    rows = con.execute("""
        SELECT year(created_at) yr, round(avg(rating), 1), median(rating)
        FROM pages WHERE rating IS NOT NULL GROUP BY yr ORDER BY yr
    """).fetchall()
    years = [r[0] for r in rows]
    mean = [r[1] for r in rows]
    med = [r[2] for r in rows]

    fig, ax = plt.subplots(figsize=(10, 5.2))

    ax.plot(
        years,
        mean,
        color=ACCENT,
        linewidth=2.2,
        marker="o",
        markersize=4,
        label="mean",
    )
    ax.plot(
        years,
        med,
        color=ACCENT2,
        linewidth=2.2,
        marker="s",
        markersize=4,
        label="median",
    )
    ax.set_ylabel("rating")
    ax.legend(loc="upper right")
    ax.margins(x=0.02)
    ax.set_xticks(range(min(years), max(years) + 1, 2))

    _style_axes(ax, "Ratings fall with each cohort")

    takeaway = (
        f"Average rating slides from {mean[0]:.0f} in 2008 to {mean[-1]:.0f} in 2026. This is "
        "mostly an age effect — older pages have had years to accumulate up-votes — rather "
        "than proof that newer writing is worse; the median falls far more gently than the mean."
    )

    return _img(
        "Ratings fall with each cohort",
        _save(fig, images, "rating_by_year"),
        takeaway,
    )


def chart_rating_by_class(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Bar of average rating by object class."""
    rows = con.execute("""
        SELECT t.tag, round(avg(p.rating), 1) ar, count(*) n
        FROM page_tags t JOIN pages p ON p.url = t.page_url
        WHERE t.tag IN ('safe','euclid','keter','thaumiel','neutralized','explained','apollyon','archon')
        GROUP BY t.tag ORDER BY ar
    """).fetchall()
    labels = [r[0] for r in rows]
    avg = [r[1] for r in rows]
    colors = [ACCENT if a >= avg[len(avg) // 2] else ACCENT2 for a in avg]

    fig, ax = plt.subplots(figsize=(9, 5))

    bars = ax.barh(labels, avg, color=colors)
    ax.bar_label(bars, padding=4, fmt="{:.0f}", color=SUBINK, fontsize=9)
    ax.set_xlabel("mean rating")
    ax.margins(x=0.12)

    _style_axes(ax, "Danger sells")

    best = max(rows, key=lambda x: x[1])
    takeaway = (
        f"The more dangerous the classification, the higher the average score: Apollyon "
        f"({best[1]:.0f}) and Keter top the table, while Safe and Neutralized trail. Readers "
        "reward existential threat over the mundane."
    )

    return _img(
        "Danger sells",
        _save(fig, images, "rating_by_class"),
        takeaway,
    )


def chart_prolific_vs_acclaimed(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Bubble scatter of authors: output vs acclaim, sized by total rating."""
    rows = con.execute("""
        SELECT pa.author, count(*) n, avg(p.rating) ar, sum(p.rating) total
        FROM page_authors pa JOIN pages p ON p.url = pa.url
        WHERE p.rating IS NOT NULL
        GROUP BY pa.author HAVING count(*) >= 10
    """).fetchall()
    n = np.array([r[1] for r in rows])
    ar = np.array([r[2] for r in rows])
    total = np.array([r[3] for r in rows])

    fig, ax = plt.subplots(figsize=(10, 6.5))

    ax.scatter(
        n,
        ar,
        s=np.clip(total / 200, 8, 600),
        alpha=0.45,
        color=ACCENT,
        edgecolors="white",
        linewidth=0.4,
    )
    ax.set_xscale("log")
    ax.set_xlabel("pages written (log)")
    ax.set_ylabel("mean rating")

    # Label a few notable authors: most prolific and most acclaimed.
    notable = (
        set(np.argsort(n)[-4:]) | set(np.argsort(ar)[-4:]) | set(np.argsort(total)[-4:])
    )
    for i in notable:
        ax.annotate(
            rows[i][0],
            (float(n[i]), float(ar[i])),
            fontsize=8.5,
            color=INK,
            xytext=(5, 4),
            textcoords="offset points",
        )

    _style_axes(ax, "Prolific vs. acclaimed authors")

    takeaway = (
        "Counting every credited author (co-authors included), output and acclaim remain "
        "different games: the most prolific cluster at modest average ratings, while the "
        "highest-rated are comparatively selective — bubble size (total score) shows a few "
        "writers manage both volume and quality."
    )

    return _img(
        "Prolific vs. acclaimed authors",
        _save(fig, images, "prolific_vs_acclaimed"),
        takeaway,
    )


def chart_coauthorship_over_time(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Line: share of pages with two or more credited authors, by year."""
    rows = con.execute(f"""
        WITH ac AS (
            SELECT url, count(DISTINCT name) AS k FROM credits
            WHERE role = 'AUTHOR' AND name NOT IN {_PLACEHOLDERS}
            GROUP BY url
        )
        SELECT year(p.created_at) AS yr, count(*) AS total,
               count(*) FILTER (WHERE coalesce(ac.k, 0) >= 2) AS co
        FROM pages p LEFT JOIN ac ON ac.url = p.url
        GROUP BY yr ORDER BY yr
    """).fetchall()
    years = [r[0] for r in rows]
    pct = [100.0 * r[2] / r[1] for r in rows]

    fig, ax = plt.subplots(figsize=(10, 5.2))
    ax.plot(years, pct, color=ACCENT, linewidth=2.4, marker="o", markersize=4)
    ax.fill_between(years, pct, color=ACCENT, alpha=0.08)
    ax.set_ylabel("% of pages with ≥2 credited authors")
    ax.set_ylim(0, max(pct) * 1.15)
    ax.set_xticks(range(min(years), max(years) + 1, 2))
    _style_axes(ax, "Co-authorship over time")

    peak = max(pct)
    takeaway = (
        f"Co-authorship has climbed from near zero to about {peak:.0f}% of pages in recent years "
        "— modern SCP is increasingly a team effort (2026 is a partial year). Early collaboration "
        "is undercounted: the attribution metadata recording co-authors is a later convention."
    )
    return _img(
        "Co-authorship over time",
        _save(fig, images, "coauthorship_over_time"),
        takeaway,
    )


def chart_rating_by_team(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Bar: median rating by number of credited authors."""
    rows = con.execute("""
        WITH per_page AS (
            SELECT pa.url, any_value(p.rating) AS rating, count(*) AS n
            FROM page_authors pa JOIN pages p ON p.url = pa.url
            WHERE p.rating IS NOT NULL GROUP BY pa.url
        ),
        bucketed AS (SELECT rating, least(n, 4) AS team FROM per_page)
        SELECT team, count(*) AS pages, median(rating) AS med
        FROM bucketed GROUP BY team ORDER BY team
    """).fetchall()
    names = {1: "1 (solo)", 2: "2", 3: "3", 4: "4+"}
    labels = [names[r[0]] for r in rows]
    med = [r[2] for r in rows]
    counts = [r[1] for r in rows]

    fig, ax = plt.subplots(figsize=(9, 5))
    bars = ax.bar(labels, med, color=ACCENT, width=0.62)
    ax.bar_label(bars, fmt="{:.0f}", padding=3, color=SUBINK, fontsize=10)
    for i, c in enumerate(counts):
        ax.text(i, max(med) * 0.04, f"n={c:,}", ha="center", color="white", fontsize=8)
    ax.set_ylabel("median rating")
    ax.set_xlabel("number of credited authors")
    _style_axes(ax, "Bigger teams, higher ratings")

    takeaway = (
        f"Median rating rises with team size — from {med[0]:.0f} for solo pages to {med[-1]:.0f} "
        "for the largest teams. Collaboration correlates with a warmer reception, though the "
        "most ambitious projects also tend to attract co-authors."
    )
    return _img(
        "Bigger teams, higher ratings",
        _save(fig, images, "rating_by_team"),
        takeaway,
    )


def chart_collaboration_network(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Circular network of co-authorship among the most-connected authors."""
    edges = con.execute("""
        WITH a AS (SELECT url, author FROM page_authors)
        SELECT x.author, y.author, count(*) AS w
        FROM a x JOIN a y ON x.url = y.url AND x.author < y.author
        GROUP BY x.author, y.author
    """).fetchall()
    pages = dict(
        con.execute(
            "SELECT author, count(*) FROM page_authors GROUP BY author"
        ).fetchall()
    )
    # Rank authors by *recurring* collaboration (≥2 shared pages) so the named hub matches the
    # drawn edges; one-off links from mass-collaboration pages would otherwise dominate.
    recurring = [(a, b, w) for a, b, w in edges if w >= 2]
    degree: dict[str, int] = {}
    for a1, a2, w in recurring:
        degree[a1] = degree.get(a1, 0) + w
        degree[a2] = degree.get(a2, 0) + w
    top = [
        a for a, _ in sorted(degree.items(), key=lambda kv: kv[1], reverse=True)[:26]
    ]
    rank = set(top)
    sub = [(a, b, w) for a, b, w in recurring if a in rank and b in rank]

    angles = np.linspace(0, 2 * np.pi, len(top), endpoint=False)
    xy = {
        a: (float(np.cos(t)), float(np.sin(t)))
        for a, t in zip(top, angles, strict=True)
    }
    maxw = max(e[2] for e in sub)

    fig, ax = plt.subplots(figsize=(9.5, 9.5))
    for a, b, w in sub:
        (x1, y1), (x2, y2) = xy[a], xy[b]
        ax.plot(
            [x1, x2],
            [y1, y2],
            color=ACCENT,
            solid_capstyle="round",
            zorder=1,
            alpha=min(0.75, 0.10 + 0.65 * w / maxw),
            linewidth=0.4 + 3.0 * w / maxw,
        )
    sizes = [float(np.clip(pages.get(a, 1) * 2.0, 30, 600)) for a in top]
    ax.scatter(
        [xy[a][0] for a in top],
        [xy[a][1] for a in top],
        s=sizes,
        color=INK,
        edgecolors="white",
        linewidth=0.6,
        zorder=2,
    )
    for a, t in zip(top, angles, strict=True):
        deg = float(np.degrees(t))
        flip = 90 < deg < 270
        ax.text(
            1.06 * np.cos(t),
            1.06 * np.sin(t),
            a,
            fontsize=7.5,
            color=INK,
            ha="right" if flip else "left",
            va="center",
            rotation=deg + 180 if flip else deg,
            rotation_mode="anchor",
        )
    ax.set_xlim(-1.5, 1.5)
    ax.set_ylim(-1.5, 1.5)
    ax.set_aspect("equal")
    ax.axis("off")
    ax.set_title("How authors collaborate", loc="left", pad=12)
    ax.figure.text(0.005, 0.005, CAPTION, fontsize=7.5, color=MUTED, ha="left")

    takeaway = (
        f"Co-authorship forms tight clusters around a few hubs — {top[0]} is the most connected. "
        "Node size is total pages, edge weight is shared pages; the modern wiki is a densely "
        "woven collaborative network, not a crowd of soloists."
    )
    return _img(
        "How authors collaborate",
        _save(fig, images, "collaboration_network"),
        takeaway,
    )


def chart_tag_cooccurrence(con: duckdb.DuckDBPyConnection, images: Path) -> str:
    """Heatmap of Jaccard association between the top theme tags."""
    tags = [t for t, _ in _theme_tags(con, 14)]
    pairs = con.execute(
        """
        SELECT a.tag, b.tag, count(*) FROM page_tags a JOIN page_tags b ON a.page_url = b.page_url
        WHERE a.tag = ANY($t) AND b.tag = ANY($t) GROUP BY a.tag, b.tag
        """,
        {"t": tags},
    ).fetchall()
    idx = {t: i for i, t in enumerate(tags)}
    inter = np.zeros((len(tags), len(tags)))

    for a, b, c in pairs:
        inter[idx[a], idx[b]] = c

    freq = np.diag(inter).copy()
    jac = inter / (freq[:, None] + freq[None, :] - inter)
    np.fill_diagonal(jac, np.nan)

    fig, ax = plt.subplots(figsize=(8.5, 7.5))

    im = ax.imshow(jac, cmap="rocket_r" if "rocket_r" in plt.colormaps() else "magma_r")
    ax.set_xticks(range(len(tags)), tags, rotation=45, ha="right", fontsize=9)
    ax.set_yticks(range(len(tags)), tags, fontsize=9)
    ax.grid(visible=False)
    fig.colorbar(im, ax=ax, fraction=0.046, pad=0.04, label="Jaccard similarity")
    ax.set_title("How themes cluster", loc="left", pad=12)
    ax.figure.text(0.005, 0.005, CAPTION, fontsize=7.5, color=MUTED, ha="left")
    iu = np.triu_indices(len(tags), k=1)
    bi, bj = iu[0][np.nanargmax(jac[iu])], iu[1][np.nanargmax(jac[iu])]

    takeaway = (
        f"Themes form clear clusters. The strongest pairing is '{tags[bi]}' + '{tags[bj]}': "
        "entity descriptors (humanoid / sapient / alive) co-occur tightly, forming a "
        "'monster' cluster distinct from the genre tags."
    )

    return _img(
        "How themes cluster",
        _save(fig, images, "tag_cooccurrence"),
        takeaway,
    )


# --- Tables ---------------------------------------------------------------------------


def table_per_year(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table: one row per year with headline figures."""
    rows = con.execute("""
        WITH t AS (
            SELECT p.url, year(p.created_at) yr, p.rating, p.title,
                max(tg.tag = 'scp')::int s, max(tg.tag = 'tale')::int tl
            FROM pages p LEFT JOIN page_tags tg ON tg.page_url = p.url
            GROUP BY p.url, yr, p.rating, p.title)
        SELECT yr, count(*), sum(s), sum(tl), round(avg(rating)),
            arg_max(title, rating) AS top
        FROM t GROUP BY yr ORDER BY yr
    """).fetchall()
    auth = dict(
        con.execute(
            "SELECT year(created_at), count(DISTINCT created_by_wikidot_id) FROM pages GROUP BY 1"
        ).fetchall()
    )

    table = _md_table(
        ["Year", "Pages", "SCPs", "Tales", "Authors", "Avg rating", "Top-rated page"],
        [
            [
                str(r[0]),
                f"{r[1]:,}",
                f"{r[2]:,}",
                f"{r[3]:,}",
                f"{auth[r[0]]:,}",
                f"{r[4]:.0f}",
                r[5],
            ]
            for r in rows
        ],
    )

    takeaway = (
        "Output and contributor counts climb together — more authors, more pages — while "
        "average rating declines with each younger cohort (an age effect, not a quality one)."
    )

    return _section("Per-year summary", table, takeaway)


def table_top_pages(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table of the 15 highest-rated pages."""
    rows = con.execute("""
        SELECT title, rating, vote_count, comment_count, created_by_display_name, year(created_at)
        FROM pages ORDER BY rating DESC LIMIT 15
    """).fetchall()

    table = _md_table(
        ["#", "Title", "Rating", "Votes", "Comments", "Author", "Year"],
        [
            [
                str(i),
                r[0],
                f"{r[1]:,.0f}",
                f"{r[2]:,}",
                f"{r[3]:,}",
                r[4] or "—",
                str(r[5]),
            ]
            for i, r in enumerate(rows, 1)
        ],
    )

    takeaway = (
        "The canon is front-loaded with early classics — SCP-173, SCP-049, SCP-682 — that "
        "have compounded votes for over a decade, alongside a few modern breakouts like SCP-5000."
    )

    return _section("Top 15 highest-rated pages", table, takeaway)


def table_top_authors(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table of the 15 most-credited authors (all-authors rule)."""
    rows = con.execute("""
        WITH team AS (SELECT url, count(*) AS n FROM page_authors GROUP BY url)
        SELECT pa.author, count(*) AS pages, round(avg(p.rating)) AS ar,
               round(sum(p.rating)) AS tot,
               round(100.0 * count(*) FILTER (WHERE team.n >= 2) / count(*)) AS collab,
               arg_max(p.title, p.rating) AS best
        FROM page_authors pa
        JOIN pages p ON p.url = pa.url
        JOIN team ON team.url = pa.url
        WHERE p.rating IS NOT NULL
        GROUP BY pa.author ORDER BY pages DESC LIMIT 15
    """).fetchall()

    table = _md_table(
        [
            "#",
            "Author",
            "Pages",
            "Avg rating",
            "Total rating",
            "Co-authored",
            "Best-rated work",
        ],
        [
            [
                str(i),
                r[0],
                f"{r[1]:,}",
                f"{r[2]:.0f}",
                f"{r[3]:,.0f}",
                f"{r[4]:.0f}%",
                r[5],
            ]
            for i, r in enumerate(rows, 1)
        ],
    )

    takeaway = (
        "The most prolific authors are not the highest-scoring on average — volume and acclaim "
        "rarely coincide — but their cumulative totals show how much of the wiki rests on a few "
        "dozen people. The co-authored share shows how collaboratively each writer works."
    )

    return _section("Top 15 authors (all credited authors)", table, takeaway)


def table_coauthor_duos(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table of the most frequent co-author pairs."""
    rows = con.execute("""
        WITH a AS (SELECT url, author FROM page_authors)
        SELECT x.author, y.author, count(*) AS n, round(avg(p.rating)) AS ar
        FROM a x JOIN a y ON x.url = y.url AND x.author < y.author
        JOIN pages p ON p.url = x.url
        WHERE p.rating IS NOT NULL
        GROUP BY x.author, y.author ORDER BY n DESC LIMIT 12
    """).fetchall()

    table = _md_table(
        ["#", "Author A", "Author B", "Shared pages", "Avg rating"],
        [
            [str(i), r[0], r[1], f"{r[2]:,}", f"{r[3]:.0f}"]
            for i, r in enumerate(rows, 1)
        ],
    )
    takeaway = (
        "The wiki's tightest writing partnerships — recurring duos that have co-authored many "
        "pages together, several rating well above the site median."
    )
    return _section("Top co-author duos", table, takeaway)


def table_most_collaborative(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table of authors with the most distinct co-authors."""
    rows = con.execute("""
        WITH a AS (SELECT url, author FROM page_authors)
        SELECT x.author, count(DISTINCT y.author) AS partners, count(DISTINCT x.url) AS pages
        FROM a x JOIN a y ON x.url = y.url AND x.author <> y.author
        GROUP BY x.author ORDER BY partners DESC LIMIT 15
    """).fetchall()

    table = _md_table(
        ["#", "Author", "Distinct co-authors", "Co-authored pages"],
        [[str(i), r[0], f"{r[1]:,}", f"{r[2]:,}"] for i, r in enumerate(rows, 1)],
    )
    takeaway = (
        "The community's connectors — authors who have written with the widest circle of "
        "collaborators, knitting otherwise separate clusters together."
    )
    return _section("Most collaborative authors", table, takeaway)


def table_top_rewriters(con: duckdb.DuckDBPyConnection) -> str:
    """Markdown table of authors credited with the most rewrites."""
    rows = con.execute(f"""
        SELECT name, count(*) AS n, round(avg(rating)) AS ar
        FROM credits WHERE role = 'REWRITE' AND name NOT IN {_PLACEHOLDERS}
        GROUP BY name ORDER BY n DESC LIMIT 12
    """).fetchall()

    table = _md_table(
        ["#", "Rewriter", "Pages rewritten", "Avg rating"],
        [[str(i), r[0], f"{r[1]:,}", f"{r[2]:.0f}"] for i, r in enumerate(rows, 1)],
    )
    takeaway = (
        "The canon's caretakers: a small group does most of the rewriting that keeps the early, "
        "heavily-trafficked articles current."
    )
    return _section("Top rewriters", table, takeaway)


# --- Orchestration --------------------------------------------------------------------

_CHARTS = (
    chart_pages_per_year,
    chart_object_classes,
    chart_top_themes,
    chart_rating_distribution,
    chart_length_distribution,
    chart_author_pareto,
    chart_rating_vs_length,
    chart_rating_by_year,
    chart_rating_by_class,
    chart_prolific_vs_acclaimed,
    chart_coauthorship_over_time,
    chart_rating_by_team,
    chart_tag_cooccurrence,
    chart_collaboration_network,
)
_TABLES = (
    table_per_year,
    table_top_pages,
    table_top_authors,
    table_coauthor_duos,
    table_most_collaborative,
    table_top_rewriters,
)


def main(argv: list[str] | None = None) -> int:
    """Generate every chart and table and write the Markdown report."""
    parser = argparse.ArgumentParser(
        description="Generate the SCP dataset statistics showcase.",
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
    )
    parser.add_argument("--db", default=DEFAULT_DB, help="DuckDB database path")
    parser.add_argument(
        "--images",
        default=DEFAULT_IMAGES,
        help="Image output directory",
    )
    parser.add_argument("--report", default=DEFAULT_REPORT, help="Markdown report path")
    args = parser.parse_args(argv)

    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s %(levelname)-7s %(message)s",
        datefmt="%H:%M:%S",
    )
    images = Path(args.images)
    images.mkdir(parents=True, exist_ok=True)
    setup_style()

    con = duckdb.connect(args.db, read_only=True)
    con.execute(_VIEWS_SQL)  # register the `credits` and `page_authors` views
    sections: list[str] = []
    try:
        for fn in _CHARTS:
            logger.info("chart  %s", fn.__name__)
            sections.append(fn(con, images))

        for tfn in _TABLES:
            logger.info("table  %s", tfn.__name__)
            sections.append(tfn(con))
    finally:
        con.close()

    report = Path(args.report)
    header = (
        "# The SCP Foundation Wiki in Numbers\n\n"
        f"_{CAPTION}._\n\n"
        "A statistical tour of every content page (SCPs, tales, hubs, GOI formats and more) "
        "on the English SCP Wiki, built from the Crom API. Each figure below is followed by "
        "the conclusion it supports.\n"
    )

    report.write_text(header + "\n" + "\n".join(sections), encoding="utf-8")
    logger.info("Wrote %s and %d images to %s/", report, len(_CHARTS), images)

    return 0


if __name__ == "__main__":
    raise SystemExit(main())