from __future__ import annotations

from .shared import (
    Any,
    VALID_TRANSACTION_TYPES,
    db,
    fail,
    make_dedupe_key,
    new_id,
    normalize_date,
    normalize_tags,
    now_iso,
    ok,
    row_to_dict,
)


def create_ledger_transaction(transaction_date: str = "", type: str = "expense", amount: int | float = 0, category: str = "", subcategory: str = "", merchant: str = "", description: str = "", account_id: str = "", payment_method: str = "", person: str = "", project: str = "", tags: Any = None, is_fixed: bool = False, currency: str = "KRW", posted_date: str = "", source: str = "manual", external_id: str = "", memo: str = "", dedupe: bool = True, transaction_datetime: str = "", counterparty: str = "", balance_after: int | None = None, branch: str = "", raw_summary: str = "", raw_payload: str = "", db_path: str | None = None) -> dict[str, Any]:
    try:
        tx_date = normalize_date(transaction_date, default_today=True)
        posted = normalize_date(posted_date, default_today=False) if posted_date else ""
        amount_int = int(amount)
        tags_json = normalize_tags(tags)
    except Exception as e:
        return fail("validation_error", str(e))
    if type not in VALID_TRANSACTION_TYPES:
        return fail("validation_error", f"type must be one of {sorted(VALID_TRANSACTION_TYPES)}")
    if amount_int <= 0:
        return fail("validation_error", "amount must be a positive integer in minor units; type determines direction")
    dedupe_key = make_dedupe_key(tx_date, amount_int, merchant, account_id, external_id) if dedupe else ""
    ts = now_iso(); tx_id = new_id("tx")
    try:
        with db(db_path) as conn:
            conn.execute("""INSERT INTO transactions(id,transaction_date,posted_date,type,amount,currency,category,subcategory,merchant,description,account_id,payment_method,person,project,tags,is_fixed,source,external_id,dedupe_key,memo,transaction_datetime,counterparty,balance_after,branch,raw_summary,raw_payload,created_at,updated_at)
                          VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)""", (tx_id, tx_date, posted, type, amount_int, currency, category, subcategory, merchant, description, account_id, payment_method, person, project, tags_json, int(is_fixed), source, external_id, dedupe_key, memo, transaction_datetime, counterparty, balance_after, branch, raw_summary, raw_payload, ts, ts))
            row = conn.execute("SELECT * FROM transactions WHERE id=?", (tx_id,)).fetchone()
    except Exception as e:
        if "UNIQUE constraint failed" in str(e):
            return fail("duplicate_transaction", "transaction appears to be duplicated", dedupe_key=dedupe_key)
        return fail("db_error", str(e))
    return ok(transaction=row_to_dict(row))


def update_ledger_transaction(transaction_id: str, db_path: str | None = None, **fields: Any) -> dict[str, Any]:
    allowed = {"transaction_date","posted_date","type","amount","currency","category","subcategory","merchant","description","account_id","payment_method","person","project","tags","is_fixed","source","external_id","memo","status","transaction_datetime","counterparty","balance_after","branch","raw_summary","raw_payload"}
    updates=[]; params=[]
    for k,v in fields.items():
        if k not in allowed or v is None:
            continue
        if k == "tags":
            v = normalize_tags(v)
        if k in {"transaction_date","posted_date"} and v:
            v = normalize_date(v)
        if k == "amount":
            v = int(v)
        if k == "is_fixed":
            v = int(bool(v))
        updates.append(f"{k}=?"); params.append(v)
    if not updates:
        return fail("validation_error", "no fields to update")
    updates.append("updated_at=?"); params.append(now_iso()); params.append(transaction_id)
    with db(db_path) as conn:
        cur = conn.execute(f"UPDATE transactions SET {', '.join(updates)} WHERE id=?", params)
        if cur.rowcount == 0:
            return fail("not_found", "transaction not found")
        row = conn.execute("SELECT * FROM transactions WHERE id=?", (transaction_id,)).fetchone()
    return ok(transaction=row_to_dict(row))


def delete_ledger_transaction(transaction_id: str, hard_delete: bool = False, db_path: str | None = None) -> dict[str, Any]:
    with db(db_path) as conn:
        if hard_delete:
            cur = conn.execute("DELETE FROM transactions WHERE id=?", (transaction_id,))
        else:
            cur = conn.execute("UPDATE transactions SET status='deleted', updated_at=? WHERE id=?", (now_iso(), transaction_id))
        if cur.rowcount == 0:
            return fail("not_found", "transaction not found")
    return ok(transaction_id=transaction_id, deleted=True, hard_delete=hard_delete)