"""
Import Covance "All Samples" CSV do MySQL tabulky covance_samples.
Strategie: versioning — každý import = nový import_id.
Aktuální data: WHERE import_id = (SELECT MAX(import_id) FROM iwrs_import
                                   WHERE study = '...' AND report_type = 'covance_samples')
"""

import os
import glob
import datetime

import numpy as np
import pandas as pd
import mysql.connector

import db_config

SOURCE_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "SourceData")
STUDY      = "42847922MDD3003"


# ── type converters ──────────────────────────────────────────────────────────

def _py(val):
    if isinstance(val, np.generic):
        return val.item()
    return val

def to_str(val):
    val = _py(val)
    if val is None:
        return None
    if isinstance(val, float) and (val != val):
        return None
    s = str(val).strip()
    return None if s.lower() in ("nan", "nat", "none", "") else s

def to_int(val):
    val = _py(val)
    try:
        v = float(val)
        return None if (v != v) else int(v)
    except (TypeError, ValueError):
        return None

def to_date(val):
    val = _py(val)
    if val is None:
        return None
    if isinstance(val, float) and (val != val):
        return None
    try:
        if pd.isna(val):
            return None
    except (TypeError, ValueError):
        pass
    if isinstance(val, pd.Timestamp):
        return None if pd.isna(val) else val.date()
    if isinstance(val, datetime.datetime):
        return val.date()
    if isinstance(val, datetime.date):
        return val
    s = str(val).strip()
    if not s or s.lower() in ("nat", "nan", "none", ""):
        return None
    for fmt in ("%d-%b-%Y", "%Y-%m-%d", "%d-%m-%Y", "%Y-%m-%d %H:%M:%S"):
        try:
            return datetime.datetime.strptime(s, fmt).date()
        except ValueError:
            pass
    return None


# ── DB helpers ───────────────────────────────────────────────────────────────

def get_conn():
    return mysql.connector.connect(
        host=db_config.DB_HOST, port=db_config.DB_PORT,
        user=db_config.DB_USER, password=db_config.DB_PASSWORD,
        database=db_config.DB_NAME,
    )

def insert_import(cursor, study, source_file):
    cursor.execute(
        "INSERT INTO iwrs_import (study, imported_at, source_file, report_type) VALUES (%s, %s, %s, %s)",
        (study, datetime.datetime.now(), source_file, "covance_samples"),
    )
    return cursor.lastrowid


# ── parser ───────────────────────────────────────────────────────────────────

def find_csv(study):
    pattern = os.path.join(SOURCE_DIR, f"Protocol {study} - All Samples.csv")
    files = glob.glob(pattern)
    if not files:
        raise FileNotFoundError(f"Nenalezen CSV soubor: {pattern}")
    return files[0]

def parse_csv(path):
    df = pd.read_csv(path, dtype=str)
    rows = []
    for _, r in df.iterrows():
        rows.append({
            "study":                      to_str(r.get("Protocol Code")),
            "investigator_no":            to_str(r.get("Investigator No.")),
            "investigator_name":          to_str(r.get("Investigator Name")),
            "patient_no":                 to_str(r.get("Patient No.")),
            "collection_date":            to_date(r.get("Collection Date")),
            "protocol_visit_code":        to_str(r.get("Protocol Visit Code")),
            "kit_receipt_date":           to_date(r.get("Kit Receipt Date")),
            "container_receipt_date":     to_date(r.get("Container Receipt Date")),
            "accession":                  to_str(r.get("Accession")),
            "container_no":               to_int(r.get("Container No.")),
            "container_barcode":          to_str(r.get("Container Barcode No.")),
            "specimen_type":              to_str(r.get("Specimen Type")),
            "sample_status":              to_str(r.get("Sample Status")),
            "expected_receipt_condition": to_str(r.get("Expected Receipt Condition")),
            "actual_receipt_condition":   to_str(r.get("Actual Receipt Condition")),
            "label_line1":                to_str(r.get("Container Label Line 1")),
            "label_line2":                to_str(r.get("Container Label Line 2")),
            "sm_sample_status":           to_str(r.get("SM Sample Status")),
            "smart_class_description":    to_str(r.get("SMART Specimen Class Description")),
            "parent_barcode":             to_str(r.get("Parent Barcode")),
            "children_barcode":           to_str(r.get("Children Barcode")),
        })
    return rows


# ── insert ───────────────────────────────────────────────────────────────────

def insert_samples(cursor, import_id, rows):
    sql = """INSERT INTO covance_samples
        (import_id, study, investigator_no, investigator_name, patient_no,
         collection_date, protocol_visit_code, kit_receipt_date, container_receipt_date,
         accession, container_no, container_barcode, specimen_type, sample_status,
         expected_receipt_condition, actual_receipt_condition,
         label_line1, label_line2, sm_sample_status, smart_class_description,
         parent_barcode, children_barcode)
        VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)"""
    for r in rows:
        cursor.execute(sql, (
            import_id,
            r["study"], r["investigator_no"], r["investigator_name"], r["patient_no"],
            r["collection_date"], r["protocol_visit_code"],
            r["kit_receipt_date"], r["container_receipt_date"],
            r["accession"], r["container_no"], r["container_barcode"],
            r["specimen_type"], r["sample_status"],
            r["expected_receipt_condition"], r["actual_receipt_condition"],
            r["label_line1"], r["label_line2"],
            r["sm_sample_status"], r["smart_class_description"],
            r["parent_barcode"], r["children_barcode"],
        ))


# ── main ─────────────────────────────────────────────────────────────────────

def main():
    csv_path = find_csv(STUDY)
    print(f"Soubor: {os.path.basename(csv_path)}")

    rows = parse_csv(csv_path)
    print(f"Načteno řádků: {len(rows)}")

    conn = get_conn()
    cursor = conn.cursor()

    import_id = insert_import(cursor, STUDY, os.path.basename(csv_path))
    print(f"import_id = {import_id}")

    insert_samples(cursor, import_id, rows)
    conn.commit()
    cursor.close()
    conn.close()

    print(f"Hotovo — {len(rows)} vzorků importováno.")


main()