# src/day2_strings.py

import json

from pathlib import Path
from asyncio import log


def show(title: str) -> None:
    print("\n" + "=" * 10, title, "=" * 10)


def extract_user_domain(email: str) -> tuple[str, str]:
    email = email.strip()
    at = email.find("@")
    if at == -1:
        raise ValueError(f"Invalid email: {email!r}")
    user = email[:at]
    domain = email[at + 1:]
    return user, domain


def clean_csv_like(s: str) -> list[str]:
    # "  a, b ,c  " -> ["a", "b", "c"]
    s = s.strip()
    parts = [p.strip() for p in s.split(",")]
    return parts


def parse_log(line: str) -> dict:
    line = line.strip()
    date, time, level, rest = line.split(" ", maxsplit=3)
    out = {"date": date, "time": time, "level": level}

    i = 0
    n = len(rest)

    while i < n:
        # 공백 스킵
        while i < n and rest[i] == " ":
            i += 1
        if i >= n:
            break

        # key 읽기
        eq = rest.find("=", i)
        if eq == -1:
            break
        key = rest[i:eq]
        i = eq + 1

        # value 읽기 (따옴표면 "..." 끝까지, 아니면 공백 전까지)
        if i < n and rest[i] == '"':
            i += 1
            endq = rest.find('"', i)
            if endq == -1:
                raise ValueError("Unclosed quote in log value")
            val = rest[i:endq]
            i = endq + 1
        else:
            # 공백 전까지
            j = i
            while j < n and rest[j] != " ":
                j += 1
            val = rest[i:j]
            i = j

        out[key] = int(val) if val.isdigit() else val

    return out


def validate(d: dict) -> list[str]:
    errors = []
    status = d.get("status")
    user_id = d.get("user_id")
    path = d.get("path")

    if not (isinstance(status, int) and 100 <= status <= 599):
        errors.append(f"bad status={status}")
    if not (isinstance(user_id, int) and user_id > 0):
        errors.append(f"bad user_id={user_id}")
    if not (isinstance(path, str) and path.startswith("/")):
        errors.append(f"bad path={path!r}")
    return errors


def main() -> None:
    raw_path = Path("data/raw/sample.log")
    ok_rows = []
    bad_rows = []

    for idx, line in enumerate(raw_path.read_text(encoding="utf-8").splitlines(), start=1):
        if not line.strip():
            continue
        d = parse_log(line)
        errs = validate(d)
        if errs:
            bad_rows.append({"line_no": idx, "errors": errs, "row": d})
        else:
            ok_rows.append(d)
            Path("data/processed/parsed_logs.json").write_text(
                json.dumps(ok_rows, ensure_ascii=False, indent=2),
                encoding="utf-8"
            )
    Path("data/processed/parsed_logs_errors.json").write_text(
        json.dumps(bad_rows, ensure_ascii=False, indent=2),
        encoding="utf-8"
    )

    print(f"OK={len(ok_rows)}, BAD={len(bad_rows)}")

    show("indexing / slicing")
    e = " admin@company.co.kr "
    user, domain = extract_user_domain(e)
    print(f"email={e!r} -> user={user!r}, domain={domain!r}")
    print("domain first char:", domain[0])
    print("domain last char:", domain[-1])

    show("split / join / strip / replace")
    s = "  a, b ,c  "
    parts = clean_csv_like(s)
    print("parts:", parts)
    joined = "|".join(parts)
    print("joined:", joined)
    print("replaced:", joined.replace("b", "B"))

    show("escape + formatting")
    msg = "He said: \"hello\"\nNext\tTabbed"
    print(msg)
    print(f"repr: {msg!r}")

    show("log parsing")
    log = '2026-01-21 09:12:33 INFO user_id=42 status=200 path="/api v1/auth" msg="login failed: bad password"'
    print(parse_log(log))

    d = parse_log(log)
    assert 100 <= d.get("status", 0) < 599, f"bad status: {d.get('status')}"
    assert d.get("user_id", 0) > 0, f"bad user_id: {d.get('user_id')}"
    assert isinstance(d.get("path"), str) and d["path"].startswith(
        "/"), f"bad path: {d.get('path')}"

    print("quality checks: OK")
    print(d)

    out_path = Path("data/processed/parsed_log.json")
    out_path.write_text(json.dumps(
        d, ensure_ascii=False, indent=2), encoding="utf-8")
    print(f"saved -> {out_path}")


if __name__ == "__main__":
    main()