"""
Dry-run: for every template, count how many JSON files in one or more
data directories are compatible (per the same check used by
infographics_generator).

Usage:
    # default (read pools from config.data_resource_dirs)
    python scripts/match_templates_to_data.py --out scripts/_template_match.csv

    # explicit pools
    python scripts/match_templates_to_data.py \
        --data /data/liduan/resources/claude_data_v2 /data/liduan/resources/claude_new \
        --out scripts/_template_match.csv
"""
import argparse
import csv
import json
import os
import sys
from pathlib import Path
from collections import defaultdict

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT))

from config import data_resource_dirs as CFG_DATA_DIRS
from modules.chart_engine.template.template_registry import scan_templates
from modules.infographics_generator.template_utils import (
    analyze_templates,
    check_template_compatibility,
)


def parse_args():
    p = argparse.ArgumentParser()
    p.add_argument("--data", nargs="+", default=None,
                   help="One or more directories of input JSONs "
                        "(default: config.data_resource_dirs)")
    p.add_argument("--out", default="scripts/_template_match.csv", help="CSV report path")
    p.add_argument("--engines", nargs="+",
                   default=["d3-js", "echarts-js", "echarts_py"],
                   help="Which engines to consider")
    p.add_argument("--sample", type=int, default=0,
                   help="If >0, randomly subsample this many files (per --seed)")
    p.add_argument("--seed", type=int, default=42)
    return p.parse_args()


def main():
    args = parse_args()
    data_dirs = [Path(p) for p in (args.data or CFG_DATA_DIRS)]
    for d in data_dirs:
        if not d.is_dir():
            raise SystemExit(f"--data path is not a directory: {d}")

    json_files = []
    for d in data_dirs:
        files = sorted(d.glob("*.json"))
        json_files.extend(files)
        print(f"  {d}: {len(files)} json files")
    print(f"Total: {len(json_files)} json files across {len(data_dirs)} dir(s)")

    if args.sample and args.sample < len(json_files):
        import random
        random.Random(args.seed).shuffle(json_files)
        json_files = json_files[:args.sample]
        print(f"Sub-sampled to {len(json_files)} files (seed={args.seed})")

    datas = []
    for f in json_files:
        with open(f, "r") as fh:
            d = json.load(fh)
        d["name"] = str(f)
        # Disambiguate filenames when the same basename exists in both pools:
        # use "<dir-name>/<filename>" so picker / driver can map back uniquely.
        rel = f"{f.parent.name}/{f.name}"
        datas.append((rel, d))

    templates = scan_templates()
    _, template_requirements = analyze_templates(templates)

    # Enumerate ALL templates (engine/chart_type/chart_name) keys
    all_template_keys = []
    for engine, t_dict in templates.items():
        if engine not in args.engines:
            continue
        for chart_type, c_dict in t_dict.items():
            for chart_name in c_dict:
                if "base" in chart_name:
                    continue
                all_template_keys.append((engine, chart_type, chart_name))
    print(f"Total templates (engines={args.engines}): {len(all_template_keys)}")

    # For each data, compute compatible templates ONCE (it returns the full list)
    # then we tally per template.
    counter = defaultdict(int)
    matched_files = defaultdict(list)
    for name, data in datas:
        compat = check_template_compatibility(data, templates, None)
        for tpl_key, _ordered_fields in compat:
            counter[tpl_key] += 1
            matched_files[tpl_key].append(name)

    os.makedirs(os.path.dirname(args.out) or ".", exist_ok=True)
    with open(args.out, "w", newline="") as fh:
        w = csv.writer(fh)
        w.writerow(["engine", "chart_type", "chart_name", "num_compatible_data"])
        for engine, chart_type, chart_name in all_template_keys:
            tpl_key = f"{engine}/{chart_type}/{chart_name}"
            w.writerow([engine, chart_type, chart_name, counter.get(tpl_key, 0)])
    print(f"Wrote {args.out}")

    # Distribution histogram
    buckets = [0, 1, 5, 10, 20, 30, 50, 100, 10**9]
    bucket_labels = ["0", "1-4", "5-9", "10-19", "20-29", "30-49", "50-99", "100+"]
    bucket_counts = [0] * len(bucket_labels)
    for engine, chart_type, chart_name in all_template_keys:
        n = counter.get(f"{engine}/{chart_type}/{chart_name}", 0)
        for i in range(len(bucket_labels)):
            if buckets[i] <= n < buckets[i + 1]:
                bucket_counts[i] += 1
                break

    print()
    print("Templates by number of compatible data files in",
          ", ".join(str(d) for d in data_dirs))
    for lab, c in zip(bucket_labels, bucket_counts):
        print(f"  {lab:>8s}: {c}")

    n_geq_20 = sum(1 for k in all_template_keys
                   if counter.get("/".join(k), 0) >= 20)
    n_geq_5 = sum(1 for k in all_template_keys
                  if counter.get("/".join(k), 0) >= 5)
    print()
    print(f"Templates with >= 20 compatible data: {n_geq_20}")
    print(f"Templates with >=  5 compatible data: {n_geq_5}")


if __name__ == "__main__":
    main()