import json
from pathlib import Path

import click

import build_purchases
import review_products
from layer_helpers import read_csv_rows, write_csv_rows


SUMMARY_FIELDS = ["stage", "count"]


def read_rows_if_exists(path):
    path = Path(path)
    if not path.exists():
        return []
    return read_csv_rows(path)


def build_status_summary(
    giant_orders,
    giant_items,
    giant_enriched,
    costco_orders,
    costco_items,
    costco_enriched,
    purchases,
    resolutions,
    links,
    catalog,
):
    normalized_rows = giant_enriched + costco_enriched
    queue_rows = review_products.build_review_queue(purchases, resolutions, links, catalog, [])
    queue_ids = {row["normalized_item_id"] for row in queue_rows}

    unresolved_purchase_rows = [
        row
        for row in purchases
        if row.get("normalized_item_id")
        and not row.get("catalog_id")
        and row.get("resolution_action") != "exclude"
        and row.get("is_fee") != "true"
        and row.get("is_discount_line") != "true"
        and row.get("is_coupon_line") != "true"
    ]
    excluded_rows = [row for row in purchases if row.get("resolution_action") == "exclude"]
    linked_purchase_rows = [row for row in purchases if row.get("catalog_id")]
    distinct_normalized_items = {
        row["normalized_item_id"] for row in normalized_rows if row.get("normalized_item_id")
    }
    linked_normalized_items = {
        row["normalized_item_id"] for row in purchases if row.get("normalized_item_id") and row.get("catalog_id")
    }

    summary = [
        {"stage": "raw_orders", "count": len(giant_orders) + len(costco_orders)},
        {"stage": "raw_items", "count": len(giant_items) + len(costco_items)},
        {"stage": "normalized_items", "count": len(normalized_rows)},
        {"stage": "distinct_normalized_items", "count": len(distinct_normalized_items)},
        {"stage": "review_queue_normalized_items", "count": len(queue_rows)},
        {"stage": "linked_normalized_items", "count": len(linked_normalized_items)},
        {"stage": "linked_purchase_rows", "count": len(linked_purchase_rows)},
        {"stage": "final_purchase_rows", "count": len(purchases)},
        {"stage": "unresolved_purchase_rows", "count": len(unresolved_purchase_rows)},
        {"stage": "excluded_purchase_rows", "count": len(excluded_rows)},
        {
            "stage": "unresolved_not_in_review_rows",
            "count": len(
                [
                    row
                    for row in unresolved_purchase_rows
                    if row.get("normalized_item_id") not in queue_ids
                ]
            ),
        },
    ]
    return summary


@click.command()
@click.option("--giant-orders-csv", default="data/giant-web/collected_orders.csv", show_default=True)
@click.option("--giant-items-csv", default="data/giant-web/collected_items.csv", show_default=True)
@click.option("--giant-enriched-csv", default="data/giant-web/normalized_items.csv", show_default=True)
@click.option("--costco-orders-csv", default="data/costco-web/collected_orders.csv", show_default=True)
@click.option("--costco-items-csv", default="data/costco-web/collected_items.csv", show_default=True)
@click.option("--costco-enriched-csv", default="data/costco-web/normalized_items.csv", show_default=True)
@click.option("--purchases-csv", default="data/review/purchases.csv", show_default=True)
@click.option("--resolutions-csv", default="data/review/review_resolutions.csv", show_default=True)
@click.option("--links-csv", default="data/review/product_links.csv", show_default=True)
@click.option("--catalog-csv", default="data/catalog.csv", show_default=True)
@click.option("--summary-csv", default="data/review/pipeline_status.csv", show_default=True)
@click.option("--summary-json", default="data/review/pipeline_status.json", show_default=True)
def main(
    giant_orders_csv,
    giant_items_csv,
    giant_enriched_csv,
    costco_orders_csv,
    costco_items_csv,
    costco_enriched_csv,
    purchases_csv,
    resolutions_csv,
    links_csv,
    catalog_csv,
    summary_csv,
    summary_json,
):
    summary_rows = build_status_summary(
        read_rows_if_exists(giant_orders_csv),
        read_rows_if_exists(giant_items_csv),
        read_rows_if_exists(giant_enriched_csv),
        read_rows_if_exists(costco_orders_csv),
        read_rows_if_exists(costco_items_csv),
        read_rows_if_exists(costco_enriched_csv),
        read_rows_if_exists(purchases_csv),
        [build_purchases.normalize_resolution_row(row) for row in read_rows_if_exists(resolutions_csv)],
        [build_purchases.normalize_link_row(row) for row in read_rows_if_exists(links_csv)],
        [build_purchases.normalize_catalog_row(row) for row in read_rows_if_exists(catalog_csv)],
    )
    write_csv_rows(summary_csv, summary_rows, SUMMARY_FIELDS)
    summary_json_path = Path(summary_json)
    summary_json_path.parent.mkdir(parents=True, exist_ok=True)
    summary_json_path.write_text(json.dumps(summary_rows, indent=2), encoding="utf-8")
    for row in summary_rows:
        click.echo(f"{row['stage']}: {row['count']}")


if __name__ == "__main__":
    main()