"""Agrégation des minifigs par personnage représenté."""

import csv
from collections import defaultdict
from pathlib import Path
from typing import Dict, Iterable, List, Sequence, Set

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


def load_minifigs_by_set(path: Path) -> List[dict]:
    """Charge le CSV minifigs_by_set."""
    return read_rows(path)


def aggregate_by_character(rows: Iterable[dict]) -> List[dict]:
    """Compte les minifigs distinctes par personnage (fig_num unique) avec genre."""
    fig_nums_by_character: Dict[str, set] = defaultdict(set)
    genders: Dict[str, str] = {}
    for row in rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        gender = row.get("gender", "").strip()
        if character == "" or fig_num == "":
            continue
        fig_nums_by_character[character].add(fig_num)
        if character not in genders:
            genders[character] = gender
    aggregates: List[dict] = []
    for character, fig_nums in fig_nums_by_character.items():
        aggregates.append({"known_character": character, "gender": genders.get(character, ""), "minifig_count": len(fig_nums)})
    aggregates.sort(key=lambda r: (-r["minifig_count"], r["known_character"]))
    return aggregates


def aggregate_variations_and_totals(
    rows: Iterable[dict],
    excluded_characters: Sequence[str] | None = None,
) -> List[dict]:
    """Compte les variations uniques et le total de minifigs par personnage."""
    excluded = set(excluded_characters or [])
    variations: Dict[str, set] = defaultdict(set)
    totals: Dict[str, int] = defaultdict(int)
    genders: Dict[str, str] = {}
    for row in rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        gender = row.get("gender", "").strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        variations[character].add(fig_num)
        totals[character] += 1
        if character not in genders:
            genders[character] = gender
    aggregates: List[dict] = []
    for character, fig_nums in variations.items():
        aggregates.append(
            {
                "known_character": character,
                "gender": genders.get(character, ""),
                "variation_count": len(fig_nums),
                "total_minifigs": totals.get(character, 0),
            }
        )
    aggregates.sort(key=lambda r: (-r["total_minifigs"], -r["variation_count"], r["known_character"]))
    return aggregates


def aggregate_new_characters_by_year(
    minifigs_rows: Iterable[dict],
    sets_years: Dict[str, str],
    excluded_characters: Sequence[str] | None = None,
    start_year: int | None = None,
    end_year: int | None = None,
) -> List[dict]:
    """Compte le nombre de personnages introduits par année sur une plage donnée."""
    excluded = set(excluded_characters or [])
    first_year: Dict[str, int] = {}
    for row in minifigs_rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        year_str = sets_years.get(row["set_num"])
        if year_str is None:
            continue
        year_int = int(year_str)
        current = first_year.get(character)
        if current is None or year_int < current:
            first_year[character] = year_int
    counts: Dict[int, int] = {}
    if start_year is not None and end_year is not None:
        for year in range(start_year, end_year + 1):
            counts[year] = 0
    for character, year_int in first_year.items():
        if start_year is not None and year_int < start_year:
            continue
        if end_year is not None and year_int > end_year:
            continue
        counts[year_int] = counts.get(year_int, 0) + 1
    years = sorted(counts.keys())
    results: List[dict] = []
    for year in years:
        results.append({"year": str(year), "new_characters": str(counts[year])})
    return results


def aggregate_new_character_sets(
    minifigs_rows: Iterable[dict],
    sets_lookup: Dict[str, dict],
    excluded_characters: Sequence[str] | None = None,
    start_year: int | None = None,
    end_year: int | None = None,
) -> List[dict]:
    """Liste les personnages introduits par année avec les sets correspondants."""
    excluded = set(excluded_characters or [])
    first_year: Dict[str, int] = {}
    for row in minifigs_rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        set_row = sets_lookup.get(row["set_num"])
        if set_row is None:
            continue
        year_int = int(set_row["year"])
        current = first_year.get(character)
        if current is None or year_int < current:
            first_year[character] = year_int
    rows: List[dict] = []
    seen: set[tuple[str, str]] = set()
    for row in minifigs_rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        set_row = sets_lookup.get(row["set_num"])
        if set_row is None:
            continue
        intro_year = first_year.get(character)
        if intro_year is None:
            continue
        if start_year is not None and intro_year < start_year:
            continue
        if end_year is not None and intro_year > end_year:
            continue
        if int(set_row["year"]) != intro_year:
            continue
        key = (character, set_row["set_num"])
        if key in seen:
            continue
        rows.append(
            {
                "year": str(int(set_row["year"])),
                "known_character": character,
                "set_num": set_row["set_num"],
                "set_id": set_row.get("set_id", ""),
                "set_name": set_row.get("name", ""),
                "rebrickable_url": set_row.get("rebrickable_url", ""),
            }
        )
        seen.add(key)
    rows.sort(key=lambda r: (int(r["year"]), r["known_character"], r["set_id"]))
    return rows


def aggregate_by_gender(rows: Iterable[dict]) -> List[dict]:
    """Compte les minifigs distinctes par genre (fig_num unique)."""
    genders_by_fig: Dict[str, str] = {}
    counts: Dict[str, int] = defaultdict(int)
    for row in rows:
        fig_num = row["fig_num"].strip()
        gender = row.get("gender", "").strip().lower()
        normalized = gender if gender in ("male", "female") else "unknown"
        if fig_num == "":
            continue
        if fig_num in genders_by_fig:
            continue
        genders_by_fig[fig_num] = normalized
        counts[normalized] += 1
    aggregates: List[dict] = []
    ordered = ["female", "male", "unknown"]
    for gender in ordered:
        if gender in counts:
            aggregates.append({"gender": gender, "minifig_count": str(counts[gender])})
    return aggregates


def write_character_counts(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV des comptes par personnage."""
    ensure_parent_dir(path)
    fieldnames = ["known_character", "gender", "minifig_count"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def write_new_characters_by_year(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV des personnages introduits chaque année."""
    ensure_parent_dir(path)
    fieldnames = ["year", "new_characters"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def write_new_character_sets_csv(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV listant les personnages introduits et leurs sets."""
    ensure_parent_dir(path)
    fieldnames = ["year", "known_character", "set_num", "set_id", "set_name", "rebrickable_url"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def write_new_character_sets_markdown(path: Path, rows: Sequence[dict]) -> None:
    """Écrit un Markdown listant les personnages introduits par année et leurs sets."""
    ensure_parent_dir(path)
    grouped: Dict[str, Dict[str, List[dict]]] = {}
    for row in rows:
        year_group = grouped.setdefault(row["year"], {})
        characters = year_group.setdefault(row["known_character"], [])
        characters.append(row)
    with path.open("w") as md_file:
        for year in sorted(grouped.keys(), key=int):
            md_file.write(f"##### {year}\n\n")
            for character in sorted(grouped[year].keys()):
                md_file.write(f"- {character}\n")
                for entry in sorted(grouped[year][character], key=lambda r: r["set_id"]):
                    link = entry["rebrickable_url"] or ""
                    set_id = entry["set_id"]
                    name = entry["set_name"]
                    md_file.write(f"    - [{set_id}]({link}) - {name}\n")
            md_file.write("\n")


def write_gender_counts(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV des comptes par genre."""
    ensure_parent_dir(path)
    fieldnames = ["gender", "minifig_count"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def write_character_variations_totals(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV comparant variations et total par personnage."""
    ensure_parent_dir(path)
    fieldnames = ["known_character", "gender", "variation_count", "total_minifigs"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def load_sets_enriched(path: Path) -> Dict[str, str]:
    """Indexe les années par set_num."""
    lookup: Dict[str, str] = {}
    with path.open() as sets_file:
        reader = csv.DictReader(sets_file)
        for row in reader:
            lookup[row["set_num"]] = row["year"]
    return lookup


def aggregate_presence_by_year(
    minifigs_rows: Iterable[dict],
    sets_years: Dict[str, str],
    excluded_characters: Sequence[str] | None = None,
) -> List[dict]:
    """Compte le nombre total de minifigs par personnage et par année (hors figurants)."""
    excluded = set(excluded_characters or [])
    counts: Dict[tuple[str, int], int] = defaultdict(int)
    years_all = {int(year) for year in sets_years.values()}
    characters_all: Set[str] = set()
    for row in minifigs_rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        year = sets_years.get(row["set_num"])
        if year is None:
            continue
        year_int = int(year)
        counts[(character, year_int)] += 1
        characters_all.add(character)
    years = sorted(years_all)
    characters = sorted(characters_all)
    results: List[dict] = []
    for character in characters:
        for year in years:
            count = counts.get((character, year), 0)
            results.append(
                {
                    "known_character": character,
                    "year": str(year),
                    "minifig_count": str(count),
                }
            )
    return results


def write_presence_by_year(path: Path, rows: Sequence[dict]) -> None:
    """Écrit la matrice présence binaire année/personnage."""
    ensure_parent_dir(path)
    fieldnames = ["known_character", "year", "minifig_count"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def aggregate_character_spans(
    minifigs_rows: Iterable[dict],
    sets_years: Dict[str, str],
    excluded_characters: Sequence[str] | None = None,
) -> List[dict]:
    """Calcule la période d'apparition de chaque personnage (bornes min/max des années observées)."""
    excluded = set(excluded_characters or [])
    spans: Dict[str, Dict[str, int]] = {}
    total_counts: Dict[str, int] = defaultdict(int)
    genders: Dict[str, str] = {}
    for row in minifigs_rows:
        character = row["known_character"].strip()
        fig_num = row["fig_num"].strip()
        gender = row.get("gender", "").strip()
        if character == "" or fig_num == "":
            continue
        if character in excluded:
            continue
        year = sets_years.get(row["set_num"])
        if year is None:
            continue
        year_int = int(year)
        total_counts[character] += 1
        if character not in genders:
            genders[character] = gender
        current = spans.get(character)
        if current is None:
            spans[character] = {"start": year_int, "end": year_int}
        else:
            spans[character]["start"] = min(current["start"], year_int)
            spans[character]["end"] = max(current["end"], year_int)
    results: List[dict] = []
    for character, bounds in spans.items():
        results.append(
            {
                "known_character": character,
                "start_year": str(bounds["start"]),
                "end_year": str(bounds["end"]),
                "total_minifigs": str(total_counts[character]),
                "gender": genders.get(character, ""),
            }
        )
    results.sort(key=lambda r: (int(r["start_year"]), int(r["end_year"]), r["known_character"]))
    return results


def write_character_spans(path: Path, rows: Sequence[dict]) -> None:
    """Écrit le CSV des bornes min/max par personnage."""
    ensure_parent_dir(path)
    fieldnames = ["known_character", "start_year", "end_year", "total_minifigs", "gender"]
    with path.open("w", newline="") as csv_file:
        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)