#!/usr/bin/env python3
"""Create blinded publishable datasets from raw and temporary inputs.

Inputs:
  - temporary/all_email_blasts_consolidated.csv
  - temporary/sampled_email_addresses.csv
  - temporary/sampled_courses.csv
  - raw_data/expirations.csv
  - raw_data/orders.csv
  - .env with LARGE_BLAST_SIZE

Outputs:
    - published_data/email_blasts.parquet
    - published_data/expirations.parquet
    - published_data/orders.parquet

Blinded indexes are the 0-based row positions from the sampled CSV files,
excluding the header row.
"""

from __future__ import annotations

import argparse
import csv
from decimal import Decimal, InvalidOperation
from pathlib import Path

import pyarrow as pa
import pyarrow.parquet as pq


def parse_args() -> argparse.Namespace:
    project_root = Path(__file__).resolve().parent.parent
    parser = argparse.ArgumentParser(
        description="Create publishable blinded datasets from sampled inputs."
    )
    parser.add_argument(
        "--blast-file",
        default=str(project_root / "temporary" / "all_email_blasts_consolidated.csv"),
    )
    parser.add_argument(
        "--sampled-emails-file",
        default=str(project_root / "temporary" / "sampled_email_addresses.csv"),
    )
    parser.add_argument(
        "--sampled-courses-file",
        default=str(project_root / "temporary" / "sampled_courses.csv"),
    )
    parser.add_argument(
        "--expirations-file",
        default=str(project_root / "raw_data" / "expirations.csv"),
    )
    parser.add_argument(
        "--orders-file",
        default=str(project_root / "raw_data" / "orders.csv"),
    )
    parser.add_argument(
        "--env-file",
        default=str(project_root / ".env"),
    )
    parser.add_argument(
        "--output-folder",
        default=str(project_root / "published_data"),
    )
    return parser.parse_args()


def read_env_values(env_path: Path) -> dict[str, str]:
    if not env_path.exists():
        raise FileNotFoundError(f"Required env file not found: {env_path}")

    values: dict[str, str] = {}
    with env_path.open("r", encoding="utf-8") as f:
        for line in f:
            stripped = line.strip()
            if not stripped or stripped.startswith("#") or "=" not in stripped:
                continue
            key, value = stripped.split("=", 1)
            values[key.strip()] = value.strip().strip('"').strip("'")
    return values


def read_required_large_blast_size(env_path: Path) -> int:
    values = read_env_values(env_path)
    raw = values.get("LARGE_BLAST_SIZE", "")
    if not raw:
        raise RuntimeError(f"LARGE_BLAST_SIZE was not found or empty in: {env_path}")
    try:
        return int(raw)
    except ValueError as exc:
        raise RuntimeError(
            f"LARGE_BLAST_SIZE must be an integer in: {env_path}"
        ) from exc


def read_index_map(path: Path, required_header: str) -> dict[str, int]:
    if not path.exists():
        raise FileNotFoundError(f"Required sampled file not found: {path}")

    mapping: dict[str, int] = {}
    with path.open("r", encoding="utf-8", newline="") as f:
        reader = csv.DictReader(f)
        if not reader.fieldnames:
            raise RuntimeError(f"Sampled file has no header: {path}")
        if required_header not in reader.fieldnames:
            raise RuntimeError(
                f"Sampled file missing required '{required_header}' column: {path}"
            )

        for index, row in enumerate(reader):
            key = (row.get(required_header) or "").strip().lower()
            if not key:
                raise RuntimeError(
                    f"Blank {required_header} value found at sampled index {index} in: {path}"
                )
            if key in mapping:
                raise RuntimeError(
                    f"Duplicate {required_header} value found in sampled file: {key}"
                )
            mapping[key] = index

    if not mapping:
        raise RuntimeError(f"No sampled values found in: {path}")

    return mapping


def read_blast_exp_columns(blast_path: Path) -> list[str]:
    if not blast_path.exists():
        raise FileNotFoundError(f"Required blast file not found: {blast_path}")

    with blast_path.open("r", encoding="utf-8", newline="") as f:
        reader = csv.DictReader(f)
        if not reader.fieldnames:
            raise RuntimeError(f"Blast file has no header: {blast_path}")
        return [
            col for col in reader.fieldnames if col and col.strip().lower().endswith("_exp")
        ]


def get_blast_course_columns(
    exp_columns: list[str], course_index_map: dict[str, int]
) -> list[tuple[int, str, str]]:
    blinded_columns: list[tuple[int, str, str]] = []
    for exp_col in exp_columns:
        course_name = exp_col.strip().lower().removesuffix("_exp")
        if course_name not in course_index_map:
            raise RuntimeError(
                f"Course from blast column not found in sampled courses: {course_name}"
            )
        course_index = course_index_map[course_name]
        blinded_columns.append(
            (course_index, exp_col, f"blinded_course_{course_index}_exp")
        )
    blinded_columns.sort(key=lambda item: (item[0], item[2]))
    return blinded_columns


def parse_decimal(value: str) -> Decimal:
    try:
        return Decimal(value)
    except InvalidOperation as exc:
        raise RuntimeError(f"Invalid decimal value: {value}") from exc


def write_parquet_rows(rows: list[dict[str, object]], fieldnames: list[str], output_path: Path) -> None:
    columns = {name: [row.get(name) for row in rows] for name in fieldnames}
    table = pa.table(columns)
    pq.write_table(table, output_path)


def create_published_blasts(
    blast_path: Path,
    output_path: Path,
    email_index_map: dict[str, int],
    large_blast_size: int,
    blast_course_columns: list[tuple[int, str, str]],
) -> int:
    blinded_exp_columns = [target_col for _, _, target_col in blast_course_columns]
    fieldnames = [
        "sent_at",
        "is_large_blast",
        "email_blinded_index",
        *blinded_exp_columns,
    ]

    rows: list[dict[str, object]] = []
    with blast_path.open("r", encoding="utf-8", newline="") as src:
        reader = csv.DictReader(src)

        for row in reader:
            email = (row.get("email") or "").strip().lower()
            if email not in email_index_map:
                continue

            sent_at = (row.get("sent_at") or "").strip()
            if not sent_at:
                raise RuntimeError("Blast row missing required sent_at value")

            total_recipients_raw = (row.get("total_recipients_of_batch") or "").strip()
            try:
                total_recipients = int(total_recipients_raw)
            except ValueError as exc:
                raise RuntimeError(
                    f"Invalid total_recipients_of_batch value: {total_recipients_raw}"
                ) from exc

            out_row = {
                "sent_at": sent_at,
                "is_large_blast": 1 if total_recipients >= large_blast_size else 0,
                "email_blinded_index": email_index_map[email],
            }
            for _, source_col, target_col in blast_course_columns:
                out_row[target_col] = (row.get(source_col) or "").strip()
            rows.append(out_row)

    rows.sort(
        key=lambda row: (
            str(row["sent_at"]),
            int(row["is_large_blast"]),
            int(row["email_blinded_index"]),
            *[str(row[col]) for col in blinded_exp_columns],
        )
    )

    write_parquet_rows(rows, fieldnames, output_path)

    return len(rows)


def create_published_expirations(
    expirations_path: Path,
    output_path: Path,
    email_index_map: dict[str, int],
    course_index_map: dict[str, int],
) -> int:
    fieldnames = [
        "email_blinded_index",
        "expired_date",
        "course_blinded_index",
        "our_course",
    ]

    rows: list[dict[str, object]] = []
    with expirations_path.open("r", encoding="utf-8", newline="") as src:
        reader = csv.DictReader(src)

        for row in reader:
            email = (row.get("email") or "").strip().lower()
            if email not in email_index_map:
                continue

            certification = (row.get("certification") or "").strip().lower()
            if certification not in course_index_map:
                raise RuntimeError(
                    f"Certification not found in sampled courses: {certification}"
                )

            rows.append(
                {
                    "email_blinded_index": email_index_map[email],
                    "expired_date": (row.get("expired_date") or "").strip(),
                    "course_blinded_index": course_index_map[certification],
                    "our_course": (row.get("our_course") or "").strip(),
                }
            )

    rows.sort(
        key=lambda row: (
            int(row["email_blinded_index"]),
            str(row["expired_date"]),
            int(row["course_blinded_index"]),
            str(row["our_course"]),
        )
    )

    write_parquet_rows(rows, fieldnames, output_path)

    return len(rows)


def create_published_orders(
    orders_path: Path,
    output_path: Path,
    email_index_map: dict[str, int],
) -> int:
    fieldnames = ["created_at", "email_blinded_index", "price"]
    rows: list[dict[str, object]] = []

    with orders_path.open("r", encoding="utf-8", newline="") as src:
        reader = csv.DictReader(src)

        for row in reader:
            email = (row.get("email") or "").strip().lower()
            if email not in email_index_map:
                continue

            rows.append(
                {
                    "created_at": (row.get("created_at") or "").strip(),
                    "email_blinded_index": email_index_map[email],
                    "price": (row.get("price") or "").strip(),
                }
            )

    rows.sort(
        key=lambda row: (
            str(row["created_at"]),
            int(row["email_blinded_index"]),
            parse_decimal(str(row["price"])),
        )
    )

    write_parquet_rows(rows, fieldnames, output_path)

    return len(rows)


def main() -> None:
    args = parse_args()
    blast_path = Path(args.blast_file)
    sampled_emails_path = Path(args.sampled_emails_file)
    sampled_courses_path = Path(args.sampled_courses_file)
    expirations_path = Path(args.expirations_file)
    orders_path = Path(args.orders_file)
    env_path = Path(args.env_file)
    output_folder = Path(args.output_folder)

    output_folder.mkdir(parents=True, exist_ok=True)

    large_blast_size = read_required_large_blast_size(env_path)
    email_index_map = read_index_map(sampled_emails_path, "email")
    course_index_map = read_index_map(sampled_courses_path, "course")
    exp_columns = read_blast_exp_columns(blast_path)
    blast_course_columns = get_blast_course_columns(exp_columns, course_index_map)

    blast_rows = create_published_blasts(
        blast_path,
        output_folder / "email_blasts.parquet",
        email_index_map,
        large_blast_size,
        blast_course_columns,
    )
    expiration_rows = create_published_expirations(
        expirations_path,
        output_folder / "expirations.parquet",
        email_index_map,
        course_index_map,
    )
    order_rows = create_published_orders(
        orders_path,
        output_folder / "orders.parquet",
        email_index_map,
    )

    print(f"Published blast rows: {blast_rows:,}")
    print(f"Published expiration rows: {expiration_rows:,}")
    print(f"Published order rows: {order_rows:,}")
    print(f"Output folder: {output_folder}")


if __name__ == "__main__":
    main()