"""Tests for the message-type normalization parser (Task 1.6).

The parser must be total — it never raises on weird input — because every
incoming WeChat record runs through it during a scrape, and one malformed
type code must not abort the whole pull. Unknown codes pass through as
``"unknown"`` so the message is still ingested (and recoverable via
``raw_json``); only the ``-2`` date-divider code maps to ``"divider"``,
which the scraper uses as its drop signal.
"""

from __future__ import annotations

import pytest

from app.scraper.parsers import (
    coerce_int_or_none,
    normalize_wechat_type,
    normalize_whatsapp_type,
)


@pytest.mark.parametrize(
    "raw,expected",
    [
        # Phase-0 confirmed codes (see docs/superpowers/specs/phase0-findings.md §2).
        (1, "text"),
        (-2, "divider"),     # date separator — NOT a real message (scraper drops it)
        (2, "image"),        # image / sticker (webp) — file/fileTh are direct URLs
        (3, "image_legacy"), # old image format — file is an opaque ID (needs another endpoint)
        (4, "video"),        # mp4 — file is a direct URL
        (10, "system"),      # system / link / card / invite — non-media, skip download
        # Still-unconfirmed codes — pass through as "unknown", never dropped.
        # (6, 9, 13, 15, 21, 22 — voice/file/transfer/redpacket/quote/etc; raw_json retains the code.)
        (6, "unknown"),
        (9, "unknown"),
        (34, "unknown"),   # voice (legacy WeChat code, not yet seen in yunke)
        (49, "unknown"),   # file / link / transfer
        (10000, "unknown"),
        # Stringified ints (the upstream API may send either form).
        ("1", "text"),
        ("-2", "divider"),
        ("2", "image"),
        ("3", "image_legacy"),
        ("4", "video"),
        ("10", "system"),
        ("34", "unknown"),
    ],
)
def test_normalize_wechat_type_maps_known_and_unknown(raw, expected):
    assert normalize_wechat_type(raw) == expected


def test_normalize_wechat_type_never_raises():
    """Whatever we throw at it, it returns a string — never raises."""
    for raw in (None, "", "junk", "1.5", [], {}, object(), float("nan")):
        out = normalize_wechat_type(raw)
        assert isinstance(out, str)
        assert out == "unknown"


# ===========================================================================
# WhatsApp message-type normalization (M3)
# ===========================================================================


@pytest.mark.parametrize(
    "raw,expected",
    [
        # Phase-0 confirmed WhatsApp codes (see data dictionary §3):
        (0, "text"),
        (1, "image"),       # image / media
        (-2, "divider"),    # date separator — NOT a real message (scraper drops it)
        # Unconfirmed / other media codes — pass through as "unknown", never dropped.
        (2, "unknown"),
        (3, "unknown"),
        (13, "unknown"),
        (100, "unknown"),
        # Stringified ints (the upstream API may send either form).
        ("0", "text"),
        ("1", "image"),
        ("-2", "divider"),
        ("2", "unknown"),
    ],
)
def test_normalize_whatsapp_type_maps_known_and_unknown(raw, expected):
    assert normalize_whatsapp_type(raw) == expected


def test_normalize_whatsapp_type_never_raises():
    """Whatever we throw at it, it returns a string — never raises."""
    for raw in (None, "", "junk", "1.5", [], {}, object(), float("nan")):
        out = normalize_whatsapp_type(raw)
        assert isinstance(out, str)
        assert out == "unknown"


# ===========================================================================
# coerce_int_or_none — shared scraper helper (M3)
# ===========================================================================


def test_coerce_int_or_none_handles_documented_cases():
    """``type_raw``-style fields: str -> int; None preserved; 0 preserved."""
    assert coerce_int_or_none(None) is None
    assert coerce_int_or_none(0) == 0
    assert coerce_int_or_none(2) == 2
    assert coerce_int_or_none(-2) == -2
    assert coerce_int_or_none("0") == 0
    assert coerce_int_or_none("2") == 2
    assert coerce_int_or_none("-2") == -2


def test_coerce_int_or_none_returns_none_for_non_numeric_string():
    """A non-numeric value (e.g. a label) -> None."""
    assert coerce_int_or_none("text") is None
    assert coerce_int_or_none("") is None
    assert coerce_int_or_none("unknown") is None