#!/usr/bin/env python3
import argparse
import json
import os
import random
from typing import Dict, Any, Optional, Tuple

import pandas as pd
import numpy as np
from tqdm import tqdm


def try_read_csv(path: str) -> pd.DataFrame:
    print(f"📂 Reading: {path}")
    try:
        df = pd.read_csv(path, encoding="utf-8")
        print("   ✅ UTF-8")
        return df
    except Exception:
        df = pd.read_csv(path, encoding="latin-1")
        print("   ✅ latin-1")
        return df


def canonical_country(name: Any) -> Any:
    if pd.isna(name) or not str(name).strip():
        return np.nan
    n = str(name).strip().lower()
    synonyms = {
        "usa": "United States", "us": "United States", "u.s.": "United States",
        "uk": "United Kingdom", "u.k.": "United Kingdom",
        "south korea": "Korea, South", "republic of korea": "Korea, South",
        "russian federation": "Russia",
        "uae": "United Arab Emirates", "u.a.e.": "United Arab Emirates",
    }
    canonical = synonyms.get(n, str(name).strip())
    '''if canonical != n:
        print(f"   🌍 Canonicalized: '{name}' → '{canonical}'")'''
    return canonical


def load_city_catalog(json_path: str) -> Dict[str, list]:
    print(f"📚 Loading catalog: {json_path}")
    with open(json_path, "r", encoding="utf-8") as f:
        catalog = json.load(f)
    # Filter: chỉ giữ quốc gia có ít nhất 1 thành phố
    valid_catalog = {k: v for k, v in catalog.items() if isinstance(v, list) and len(v) > 0}
    print(f"   ✅ {len(valid_catalog)} countries with cities")
    return valid_catalog


def pick_random_city_country(catalog: Dict[str, list], rng: random.Random) -> tuple[str, str]:
    country = rng.choice(list(catalog.keys()))
    city = rng.choice(catalog[country]).strip()
    return city, country


def repair_location_in_place(df: pd.DataFrame, catalog_path: str) -> Tuple[pd.DataFrame, Dict[str, Any]]:
    print("🔧 Repairing Location → always ensure 'city, country' pair...")
    out = df.copy()
    catalog = load_city_catalog(catalog_path)
    rng = random.Random(42)

    # Parse Location
    s = out["Location"].astype(str).str.strip()
    parts = s.str.rsplit(',', n=1, expand=True)
    city_raw = parts.iloc[:, 0].str.strip().replace("", np.nan) if parts.shape[1] > 1 else pd.Series([np.nan]*len(out))
    country_raw = parts.iloc[:, 1].str.strip().replace("", np.nan) if parts.shape[1] > 1 else pd.Series([np.nan]*len(out))

    # Canonicalize country
    country_canonical = country_raw.apply(canonical_country)
    country_invalid = country_canonical.isna() | ~country_canonical.isin(catalog)
    country_fix_count = country_invalid.sum()

    # Prepare arrays
    final_city = []
    final_country = []
    city_fixed = 0
    country_fixed = 0
    both_missing_fixed = 0

    print("   🔄 Processing rows...")
    for idx in tqdm(range(len(out)), ncols=80):
        ctry = country_canonical.iloc[idx]
        city = city_raw.iloc[idx] if len(city_raw) > idx else np.nan

        # Trường hợp 1: Cả city lẫn country đều thiếu/hỏng → tạo cặp mới
        if pd.isna(ctry) or pd.isna(city) or ctry not in catalog:
            if pd.isna(ctry) and pd.isna(city):
                both_missing_fixed += 1
            new_city, new_country = pick_random_city_country(catalog, rng)
            final_city.append(new_city)
            final_country.append(new_country)
            if ctry not in catalog and not pd.isna(ctry):
                country_fixed += 1
            continue

        # Trường hợp 2: Country hợp lệ, kiểm tra city
        valid_cities_lower = {c.strip().lower() for c in catalog[ctry]}
        if pd.notna(city) and str(city).strip().lower() in valid_cities_lower:
            # City hợp lệ → giữ nguyên
            final_city.append(str(city).strip())
            final_country.append(ctry)
        else:
            # City không hợp lệ → thay bằng city thực ngẫu nhiên của country đó
            new_city = rng.choice(catalog[ctry]).strip()
            final_city.append(new_city)
            final_country.append(ctry)
            city_fixed += 1

    # Tạo Location mới
    new_location = [f"{c}, {co}" for c, co in zip(final_city, final_country)]
    out["Location"] = new_location

    actions = {
        "catalog_path": catalog_path,
        "country_fixed": int(country_fixed + both_missing_fixed),
        "city_fixed": int(city_fixed + both_missing_fixed),
        "both_missing_filled": int(both_missing_fixed),
        "total_rows": len(out),
    }
    print(f"   ✅ Done. City fixed: {city_fixed}, Country fixed: {country_fixed}, Both missing → random pair: {both_missing_fixed}")
    return out, actions


def main():
    print("🚀 Starting CSV Repair (ensure city + country in Location)")
    parser = argparse.ArgumentParser()
    parser.add_argument("-i", "--input", default="HR_Data_Clean_2020_2025.csv")
    parser.add_argument("-o", "--cleaned-csv", default="cleaned.csv")
    parser.add_argument("--catalog", default="report/provinces_by_country.json")
    args = parser.parse_args()

    # Read
    df = try_read_csv(args.input)
    print(f"   📊 Rows: {len(df):,}, Columns: {list(df.columns)}")

    if "Location" not in df.columns:
        raise ValueError("❌ 'Location' column not found")

    # Repair
    cleaned, actions = repair_location_in_place(df, catalog_path=args.catalog)

    # Save
    print(f"💾 Saving cleaned CSV → {args.cleaned_csv}")
    cleaned.to_csv(args.cleaned_csv, index=False)

    # Report
    report_path = "report/location_repair_report.json"
    os.makedirs("report", exist_ok=True)
    with open(report_path, "w", encoding="utf-8") as f:
        json.dump({"input": args.input, "actions": actions}, f, indent=2, ensure_ascii=False)

    # Summary
    print("\n" + "═" * 50)
    print("✅ REPAIR SUMMARY")
    print(f"  Input:               {args.input}")
    print(f"  Output:              {args.cleaned_csv}")
    print(f"  Country fixed:       {actions['country_fixed']:,}")
    print(f"  City fixed:          {actions['city_fixed']:,}")
    print(f"  Both missing → pair: {actions['both_missing_filled']:,}")
    print(f"  Report:              {report_path}")
    print("═" * 50)


if __name__ == "__main__":
    main()