"""AX computation tests for massCode — Developer Tools calculators + editor/status computations."""
import json
import os
import re
import subprocess
import time

import pytest
import rb_testgen_kit as kit

RESULTS_DIR = os.environ.get("RESULTS_DIR", os.path.dirname(os.path.abspath(__file__)))


def screenshot_assert(test_name, description, results_dir=None):
    results_dir = results_dir or RESULTS_DIR
    ss_dir = os.path.join(results_dir, "screenshots")
    os.makedirs(ss_dir, exist_ok=True)
    ss_path = os.path.join(ss_dir, f"{test_name}.png")
    try:
        subprocess.run(["screencapture", "-x", ss_path], timeout=5)
    except Exception:
        pass
    assertions_file = os.path.join(ss_dir, "assertions.json")
    assertions = {}
    if os.path.exists(assertions_file):
        try:
            with open(assertions_file) as f:
                assertions = json.load(f)
        except Exception:
            assertions = {}
    assertions[f"{test_name}.png"] = description
    with open(assertions_file, "w") as f:
        json.dump(assertions, f, indent=2)


def _enable_web_ax(ax, timeout=10.0):
    """Chromium/Electron builds its web-content AX tree only once an AT announces itself."""
    from ApplicationServices import AXUIElementSetAttributeValue
    try:
        AXUIElementSetAttributeValue(ax._app_ref, "AXEnhancedUserInterface", True)
    except Exception:
        pass
    deadline = time.time() + timeout
    while time.time() < deadline:
        if ax.find(role="label", max_results=1, max_depth=16):
            return True
        time.sleep(0.25)
    return False


def app_ready(ax):
    """MANDATORY bring-up: build the web AX tree and foreground the app."""
    _enable_web_ax(ax)
    try:
        from AppKit import NSRunningApplication
        a = NSRunningApplication.runningApplicationWithProcessIdentifier_(int(ax.get_pid()))
        if a is not None:
            a.activateWithOptions_(1 << 1)
    except Exception:
        pass
    time.sleep(0.4)
    return ax


def labels(ax):
    return [l.value for l in ax.find(role="label", max_results=250, max_depth=26) if l.value]


def field(ax, placeholder):
    for t in ax.find(role="text_field", max_results=15, max_depth=26):
        if (t.name or "") == placeholder:
            return t
    return None


def fields(ax):
    return ax.find(role="text_field", max_results=12, max_depth=26)


def text_areas(ax):
    return ax.find(role="text_area", max_results=8, max_depth=26)


def popups(ax):
    return ax.find(role="popup", max_results=12, max_depth=26)


def named_button(ax, name):
    for b in ax.find(role="button", max_results=40, max_depth=26):
        if (b.name or "").strip() == name.strip():
            return b
    return None


def press_labelled_group(ax, text):
    for g in ax.find(role="group", max_results=600, max_depth=26):
        if "AXPress" not in (g.actions or []):
            continue
        labs = ax.find(role="label", root_id=g.id, max_results=3, max_depth=2)
        if any((l.value or "").strip() == text for l in labs):
            return ax.action(g.id, "AXPress")
    return False


def webarea(ax):
    w = ax.find(role="webarea", max_results=1, max_depth=6)
    return w[0] if w else None


def menu_el(ax, path):
    items = ax.find(role="menu_bar_item", name=path[0], max_results=3, max_depth=3)
    if not items:
        return None
    cur = items[0]
    for lbl in path[1:]:
        kids = ax.find(role="menu_item", name=lbl, root_id=cur.id, max_results=3, max_depth=3)
        if not kids:
            return None
        cur = kids[0]
    return cur


def rb_enter_menu(ax, path, settle=1.2):
    """NAVIGATION: fire a menu item, crossing into whatever surface it opens."""
    el = menu_el(ax, path)
    if el is None:
        return False
    ok = ax.action(el.id, "AXPress")
    time.sleep(settle)
    return ok


def rb_enter_close_surface(ax, settle=1.3):
    """NAVIGATION: leave Preferences / Developer Tools / Presentation."""
    wa = webarea(ax)
    if wa is None:
        return False
    btns = ax.find(role="button", root_id=wa.id, max_results=5, max_depth=24)
    if not btns:
        return False
    ok = ax.action(btns[0].id, "AXPress")
    time.sleep(settle)
    return ok


def rb_enter_devtool(ax, tool_name, settle=1.3):
    """NAVIGATION: open the Developer Tools surface (if needed) and select a tool."""
    if "Developer Tools" not in labels(ax):
        rb_enter_menu(ax, ["massCode", "Developer Tools…"], settle=1.6)
    ok = press_labelled_group(ax, tool_name)
    time.sleep(settle)
    return ok


def select_option(ax, popup_value, option_label, settle=1.0):
    """AXPress a <select> popup (all options materialise as its menu_item children),
    then AXPress the wanted option. Returns True on success."""
    tgt = None
    for p in popups(ax):
        if (p.value or "") == popup_value:
            tgt = p
            break
    if tgt is None:
        return False
    ax.action(tgt.id, "AXPress")
    time.sleep(0.9)
    for p in popups(ax):
        for o in ax.find(role="menu_item", root_id=p.id, max_results=300, max_depth=4):
            if (o.value or "") == option_label:
                ok = ax.action(o.id, "AXPress")
                time.sleep(settle)
                return ok
    subprocess.run(["osascript", "-e",
                    'tell application "System Events" to key code 53'],
                   capture_output=True, timeout=5)
    return False


def set_input(ax, text, settle=1.0):
    """Write the first devtool text_area (Input String) and let the tool recompute."""
    ta = text_areas(ax)
    if not ta:
        return False
    ok = ax.set_value(ta[0].id, text)
    time.sleep(settle)
    return ok


def read_output(ax, index=1):
    ta = text_areas(ax)
    return ta[index].value if len(ta) > index else None


def go_home(ax):
    for _ in range(3):
        ls = labels(ax)
        if "Preferences" in ls or "Developer Tools" in ls or "1 / 0" in ls:
            if rb_enter_close_surface(ax):
                continue
        break
    if "Inbox" not in labels(ax):
        press_labelled_group(ax, "LIBRARY")
        time.sleep(0.8)
    return ax


def rb_enter_new_snippet(ax):
    """NAVIGATION: create + select a fresh snippet (the editor surface)."""
    return rb_enter_menu(ax, ["File", "New Snippet"], settle=1.6)


# ─────────────────────────────────────────────────────────────────────────────
# Local (non-navigating) computation helpers — all element lookups are re-done
# after every interaction, because AXHelper element ids are per-snapshot.
# ─────────────────────────────────────────────────────────────────────────────

UUID_RE = r"^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
_COUNT_RE = re.compile(r"^(\d+)\s+snippets?\.$")


def norm(s):
    """Normalise a multi-line devtool output for exact comparison."""
    return (s or "").replace("\r\n", "\n").replace("\r", "\n").strip()


def named_button_prefix(ax, prefix):
    """Button whose visible label STARTS WITH `prefix` (the reference truncates
    'Reverse' to 'Revers'; a recreation may spell it out)."""
    for b in ax.find(role="button", max_results=40, max_depth=26):
        if (b.name or "").strip().startswith(prefix):
            return b
    return None


def press_button(ax, name, settle=0.9):
    """Locate a devtool action button by its VISIBLE label and AXPress it."""
    b = named_button(ax, name) or named_button_prefix(ax, name)
    if b is None:
        return False
    ok = ax.action(b.id, "AXPress")
    time.sleep(settle)
    return ok


def read_result_any(ax, exclude=()):
    """Fallback Result reader: first non-empty value among the text_areas AFTER the
    input box, else any text_field value that is not a known input value."""
    for v in [ta.value for ta in text_areas(ax)][1:]:
        if v and str(v).strip() and v not in exclude:
            return v
    for f in fields(ax):
        v = f.value
        if v and str(v).strip() and v not in exclude:
            return v
    return None


def read_output_robust(ax, exclude=()):
    """Devtool Output/Result value. Prefers the pane's SECOND text_area (the documented
    Output String / Result box); falls back to any other non-empty non-input value so the
    same test also works if a recreation renders the Result as an <input>."""
    v = read_output(ax, 1)
    if v is not None and str(v).strip():
        return v
    return read_result_any(ax, exclude=exclude)


def case_convert(ax, text, button_name, in_settle=0.7, out_settle=0.8):
    """Set the Case Converter input, press one case button, return the Output String."""
    set_input(ax, text, settle=in_settle)
    if not press_button(ax, button_name, settle=out_settle):
        return None
    return read_output_robust(ax)


def set_url(ax, url, settle=1.1):
    """URL Parser input: a plain <input> (text_field), with a text_area fallback."""
    flds = fields(ax)
    if flds:
        ok = ax.set_value(flds[0].id, url)
    else:
        ta = text_areas(ax)
        ok = ax.set_value(ta[0].id, url) if ta else False
    time.sleep(settle)
    return ok


def parsed_rows(ax):
    """{Component: Value} built from the Parsed URL table(s): every row has 2 cells,
    each holding one label."""
    out = {}
    for r in ax.find(role="row", max_results=25, max_depth=28):
        cells = ax.find(role="cell", root_id=r.id, max_results=3, max_depth=2)
        vals = []
        for c in cells:
            ls = ax.find(role="label", root_id=c.id, max_results=2, max_depth=2)
            vals.append(ls[0].value if ls else "")
        if len(vals) >= 2 and vals[0]:
            out[vals[0]] = vals[1]
    return out


def select_option_any(ax, current_candidates, option_label):
    """Drive a <select> whose CURRENT value may be any of `current_candidates`
    (the reference default first) to `option_label`."""
    for cur in current_candidates:
        if select_option(ax, cur, option_label):
            return True
    return False


_ALGOS = ["MD5", "SHA1", "SHA256", "SHA512", "SHA384", "SHA224", "SHA3", "RIPEMD160"]


def uuid_result(ax):
    """UUID Generator Result box (this pane exposes ONE text_area — the Result)."""
    ta = text_areas(ax)
    if ta and str(ta[0].value or "").strip():
        return ta[0].value
    for f in fields(ax):
        v = str(f.value or "")
        if len(v) >= 36 and v.count("-") >= 4:
            return v
    return ta[0].value if ta else None


def snippet_count(ax):
    """N from the Preferences > Storage label 'N snippets.'"""
    for v in labels(ax):
        m = _COUNT_RE.match(str(v or "").strip())
        if m:
            return int(m.group(1))
    return None


CASE_INPUT = "hello world example"


class TestCaseConverter:
    """Developer Tools > Text Tools > Case Converter: input string -> 7 case outputs."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Output String 'helloWorldExample' then 'HelloWorldExample'")
    def test_case_camel_and_pascal(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Case Converter"), \
            f"could not reach Case Converter; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Case Converter Input String text_area not found"

        camel = case_convert(ax, CASE_INPUT, "camelCase")
        assert kit.rb_value(norm(camel), "helloWorldExample"), \
            f"camelCase('{CASE_INPUT}') -> {camel!r}, expected 'helloWorldExample'"

        pascal = case_convert(ax, CASE_INPUT, "PascalCase")
        screenshot_assert(
            "computation_case_converter",
            "massCode Developer Tools surface, Case Converter pane. Left rail lists Text "
            "Tools (Case Converter, Slug Generator, Sort Lines, URL Parser), Cryptography / "
            "Security and Encoders / Decoders. The pane shows an Input String box holding "
            "'hello world example', the seven case buttons (camelCase, kebab-case, "
            "snake_case, PascalCase, lower case, Start Case, UPPER CASE) and an Output "
            "String box showing the PascalCase result 'HelloWorldExample'.")
        assert kit.rb_value(norm(pascal), "HelloWorldExample"), \
            f"PascalCase('{CASE_INPUT}') -> {pascal!r}, expected 'HelloWorldExample'"

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Output String 'hello-world-example' then 'hello_world_example'")
    def test_case_kebab_and_snake(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Case Converter"), \
            f"could not reach Case Converter; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Case Converter Input String text_area not found"

        kebab = case_convert(ax, CASE_INPUT, "kebab-case")
        assert kit.rb_value(norm(kebab), "hello-world-example"), \
            f"kebab-case('{CASE_INPUT}') -> {kebab!r}, expected 'hello-world-example'"

        snake = case_convert(ax, CASE_INPUT, "snake_case")
        assert kit.rb_value(norm(snake), "hello_world_example"), \
            f"snake_case('{CASE_INPUT}') -> {snake!r}, expected 'hello_world_example'"

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Output String 'HELLO WORLD EXAMPLE', 'Hello World Example', "
                           "'hello world example'")
    def test_case_upper_lower_start(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Case Converter"), \
            f"could not reach Case Converter; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Case Converter Input String text_area not found"

        upper = case_convert(ax, CASE_INPUT, "UPPER CASE", in_settle=0.6, out_settle=0.7)
        assert kit.rb_value(norm(upper), "HELLO WORLD EXAMPLE"), \
            f"UPPER CASE('{CASE_INPUT}') -> {upper!r}, expected 'HELLO WORLD EXAMPLE'"

        start = case_convert(ax, CASE_INPUT, "Start Case", in_settle=0.6, out_settle=0.7)
        assert kit.rb_value(norm(start), "Hello World Example"), \
            f"Start Case('{CASE_INPUT}') -> {start!r}, expected 'Hello World Example'"

        lower = case_convert(ax, CASE_INPUT, "lower case", in_settle=0.6, out_settle=0.7)
        assert kit.rb_value(norm(lower), "hello world example"), \
            f"lower case('{CASE_INPUT}') -> {lower!r}, expected 'hello world example'"


class TestTextTools:
    """Slug Generator (reactive) and Sort Lines (Sort / Revers buttons)."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Output String 'Hello-World!-This-is-a-Test'")
    def test_slug_generator(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Slug Generator"), \
            f"could not reach Slug Generator; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Slug Generator Input String text_area not found"

        src = "Hello World! This is a Test"
        set_input(ax, src, settle=1.1)
        out = read_output_robust(ax, exclude=(src,))
        assert kit.rb_value(norm(out), "Hello-World!-This-is-a-Test"), \
            f"slug({src!r}) -> {out!r}, expected 'Hello-World!-This-is-a-Test'"

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Sort -> 'apple\\nbanana\\ncherry'; Revers -> 'cherry\\napple\\nbanana'")
    def test_sort_lines_ascending_and_reverse(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Sort Lines"), \
            f"could not reach Sort Lines; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Sort Lines Input String text_area not found"

        src = "banana\napple\ncherry"
        set_input(ax, src, settle=0.7)
        assert press_button(ax, "Sort", settle=0.9), "Sort button not found / not pressable"
        sorted_out = read_output_robust(ax, exclude=(src,))
        assert kit.rb_value(norm(sorted_out), "apple\nbanana\ncherry"), \
            f"Sort({src!r}) -> {sorted_out!r}, expected 'apple\\nbanana\\ncherry'"

        set_input(ax, src, settle=0.7)
        assert press_button(ax, "Revers", settle=0.9), "Revers button not found / not pressable"
        rev_out = read_output_robust(ax, exclude=(src,))
        assert kit.rb_value(norm(rev_out), "cherry\napple\nbanana"), \
            f"Revers({src!r}) -> {rev_out!r}, expected 'cherry\\napple\\nbanana'"


URL_SRC = "https://example.com:8080/path/page?x=1&y=2#frag"


class TestUrlParser:
    """Developer Tools > URL Parser: an Input URL decomposed into a Parsed URL table."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Parsed URL rows Protocol=https:, Host=example.com:8080, Port=8080, "
                           "Hostname=example.com, Pathname=/path/page")
    def test_url_parser_components(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "URL Parser"), \
            f"could not reach URL Parser; labels={labels(ax)[:25]}"
        assert fields(ax) or text_areas(ax), "URL Parser Input URL widget not found"

        set_url(ax, URL_SRC, settle=1.2)
        rows = parsed_rows(ax)
        assert rows, f"Parsed URL table produced no rows for {URL_SRC!r}"

        assert kit.rb_value(rows.get("Protocol"), "https:"), \
            f"Protocol -> {rows.get('Protocol')!r}, expected 'https:' (rows={rows})"
        assert kit.rb_value(rows.get("Host"), "example.com:8080"), \
            f"Host -> {rows.get('Host')!r}, expected 'example.com:8080' (rows={rows})"
        assert kit.rb_value(rows.get("Port"), "8080"), \
            f"Port -> {rows.get('Port')!r}, expected '8080' (rows={rows})"
        assert kit.rb_value(rows.get("Hostname"), "example.com"), \
            f"Hostname -> {rows.get('Hostname')!r}, expected 'example.com' (rows={rows})"
        assert kit.rb_value(rows.get("Pathname"), "/path/page"), \
            f"Pathname -> {rows.get('Pathname')!r}, expected '/path/page' (rows={rows})"

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Parsed URL rows Query=?x=1&y=2, Hash=#frag, "
                           "Origin=https://example.com:8080 plus split query x=1, y=2")
    def test_url_parser_query_and_hash(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "URL Parser"), \
            f"could not reach URL Parser; labels={labels(ax)[:25]}"
        assert fields(ax) or text_areas(ax), "URL Parser Input URL widget not found"

        set_url(ax, URL_SRC, settle=1.2)
        rows = parsed_rows(ax)
        assert rows, f"Parsed URL table produced no rows for {URL_SRC!r}"

        assert kit.rb_value(rows.get("Query"), "?x=1&y=2"), \
            f"Query -> {rows.get('Query')!r}, expected '?x=1&y=2' (rows={rows})"
        assert kit.rb_value(rows.get("Hash"), "#frag"), \
            f"Hash -> {rows.get('Hash')!r}, expected '#frag' (rows={rows})"
        assert kit.rb_value(rows.get("Origin"), "https://example.com:8080"), \
            f"Origin -> {rows.get('Origin')!r}, expected 'https://example.com:8080' (rows={rows})"
        assert kit.rb_value(rows.get("x"), "1"), \
            f"split query x -> {rows.get('x')!r}, expected '1' (rows={rows})"
        assert kit.rb_value(rows.get("y"), "1" if False else "2"), \
            f"split query y -> {rows.get('y')!r}, expected '2' (rows={rows})"


class TestHashing:
    """Developer Tools > Cryptography / Security: Hash + HMAC generators."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Result '5d41402abc4b2a76b9719d911017c592' (MD5 of 'hello')")
    def test_hash_md5(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Hash Generator"), \
            f"could not reach Hash Generator; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Hash Generator Input String text_area not found"

        set_input(ax, "hello", settle=1.1)
        out = read_output_robust(ax, exclude=("hello",))
        screenshot_assert(
            "computation_hash_generator",
            "massCode Developer Tools surface, Hash Generator pane. The Input String box "
            "holds 'hello', the Algorithm dropdown shows MD5, and the Result box shows the "
            "32-character hex digest 5d41402abc4b2a76b9719d911017c592. The left rail shows "
            "the Cryptography / Security group with Hash Generator selected.")
        assert kit.rb_value(norm(out), "5d41402abc4b2a76b9719d911017c592"), \
            f"MD5('hello') -> {out!r}, expected '5d41402abc4b2a76b9719d911017c592'"

    @pytest.mark.rb(depth=2, jump_kind="value",
                    expect="Result 'aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d' (SHA1) then "
                           "'2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824' "
                           "(SHA256) for 'hello'")
    def test_hash_sha1_and_sha256(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Hash Generator"), \
            f"could not reach Hash Generator; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Hash Generator Input String text_area not found"
        set_input(ax, "hello", settle=0.8)

        assert select_option_any(ax, _ALGOS, "SHA1"), \
            f"could not select SHA1 in the Algorithm popup; popups={[p.value for p in popups(ax)]}"
        sha1 = read_output_robust(ax, exclude=("hello",))
        assert kit.rb_value(norm(sha1), "aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d"), \
            f"SHA1('hello') -> {sha1!r}, expected 'aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d'"

        assert select_option_any(ax, ["SHA1"] + _ALGOS, "SHA256"), \
            f"could not select SHA256; popups={[p.value for p in popups(ax)]}"
        sha256 = read_output_robust(ax, exclude=("hello",))
        assert kit.rb_value(
            norm(sha256),
            "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"), \
            (f"SHA256('hello') -> {sha256!r}, expected "
             f"'2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'")

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Result 'bade63863c61ed0b3165806ecd6acefc' (HMAC-MD5 of 'hello' "
                           "with key 'secret')")
    def test_hmac_md5(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "HMAC Generator"), \
            f"could not reach HMAC Generator; labels={labels(ax)[:25]}"
        assert text_areas(ax), "HMAC Generator Input String text_area not found"

        set_input(ax, "hello", settle=0.7)
        flds = fields(ax)
        assert flds, "HMAC Generator Secret Key text_field not found"
        ax.set_value(flds[0].id, "secret")
        time.sleep(1.2)

        out = read_output_robust(ax, exclude=("hello", "secret"))
        assert kit.rb_value(norm(out), "bade63863c61ed0b3165806ecd6acefc"), \
            f"HMAC-MD5('hello','secret') -> {out!r}, expected 'bade63863c61ed0b3165806ecd6acefc'"


class TestCodecs:
    """Developer Tools > Encoders / Decoders: Base64 and URL codecs (Type popup)."""

    @pytest.mark.rb(depth=2, jump_kind="value",
                    expect="Encode 'Hello massCode' -> 'SGVsbG8gbWFzc0NvZGU='; Decode "
                           "'SGVsbG8gbWFzc0NvZGU=' -> 'Hello massCode'")
    def test_base64_encode_and_decode(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "Base64 Encoder / Decoder"), \
            f"could not reach Base64 Encoder / Decoder; labels={labels(ax)[:25]}"
        assert text_areas(ax), "Base64 Input String text_area not found"

        set_input(ax, "Hello massCode", settle=1.0)
        enc = read_output_robust(ax, exclude=("Hello massCode",))
        assert kit.rb_value(norm(enc), "SGVsbG8gbWFzc0NvZGU="), \
            f"base64 encode('Hello massCode') -> {enc!r}, expected 'SGVsbG8gbWFzc0NvZGU='"

        assert select_option_any(ax, ["Encode", "Decode"], "Decode"), \
            f"could not switch the Type popup to Decode; popups={[p.value for p in popups(ax)]}"
        set_input(ax, "SGVsbG8gbWFzc0NvZGU=", settle=1.0)
        dec = read_output_robust(ax, exclude=("SGVsbG8gbWFzc0NvZGU=",))
        assert kit.rb_value(norm(dec), "Hello massCode"), \
            f"base64 decode('SGVsbG8gbWFzc0NvZGU=') -> {dec!r}, expected 'Hello massCode'"

    @pytest.mark.rb(depth=2, jump_kind="value",
                    expect="Encode 'a b&c=d' -> 'a%20b%26c%3Dd'; Decode 'a%20b%26c%3Dd' "
                           "-> 'a b&c=d'")
    def test_url_encode_and_decode(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "URL Encoder / Decoder"), \
            f"could not reach URL Encoder / Decoder; labels={labels(ax)[:25]}"
        assert text_areas(ax), "URL codec Input String text_area not found"

        set_input(ax, "a b&c=d", settle=1.0)
        enc = read_output_robust(ax, exclude=("a b&c=d",))
        assert kit.rb_value(norm(enc), "a%20b%26c%3Dd"), \
            f"url encode('a b&c=d') -> {enc!r}, expected 'a%20b%26c%3Dd'"

        assert select_option_any(ax, ["Encode", "Decode"], "Decode"), \
            f"could not switch the Type popup to Decode; popups={[p.value for p in popups(ax)]}"
        set_input(ax, "a%20b%26c%3Dd", settle=1.0)
        dec = read_output_robust(ax, exclude=("a%20b%26c%3Dd",))
        assert kit.rb_value(norm(dec), "a b&c=d"), \
            f"url decode('a%20b%26c%3Dd') -> {dec!r}, expected 'a b&c=d'"


class TestGenerators:
    """Developer Tools > UUID Generator: deterministic SHAPE (RFC-4122 form + Amount)."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="Result holds 1 RFC-4122 UUID, then exactly 3 UUID lines for Amount=3")
    def test_uuid_generator_amount(self, ax):
        app_ready(ax)
        assert rb_enter_devtool(ax, "UUID Generator"), \
            f"could not reach UUID Generator; labels={labels(ax)[:25]}"

        assert press_button(ax, "Generate", settle=1.0), "UUID Generate button not found"
        one = uuid_result(ax)
        lines_one = [l.strip() for l in str(one or "").split("\n") if l.strip()]
        shape_ok = bool(lines_one) and bool(re.match(UUID_RE, lines_one[0]))
        assert kit.rb_value(shape_ok, True), \
            f"UUID Result {one!r} does not match {UUID_RE}"

        flds = fields(ax)
        assert flds, "UUID Generator Amount text_field not found"
        ax.set_value(flds[0].id, "3")
        time.sleep(0.6)
        assert press_button(ax, "Generate", settle=1.0), "UUID Generate button not found (2nd press)"

        three = uuid_result(ax)
        lines = [l.strip() for l in str(three or "").split("\n") if l.strip()]
        assert kit.rb_value(len(lines), 3), \
            f"Amount=3 produced {len(lines)} UUID line(s): {three!r}"
        assert len(lines) == 3, f"Amount=3 produced {len(lines)} UUID line(s): {three!r}"
        all_ok = all(bool(re.match(UUID_RE, l)) for l in lines)
        assert kit.rb_value(all_ok, True), f"not every generated line is a UUID: {three!r}"


class TestStorageCount:
    """Preferences > Storage 'N snippets.' — the app's snippet-count computation."""

    @pytest.mark.rb(depth=1, jump_kind="value",
                    expect="'N+1 snippets.' after creating one snippet")
    def test_storage_snippet_count_increments(self, ax):
        app_ready(ax)
        go_home(ax)

        assert rb_enter_menu(ax, ["massCode", "Settings…"], settle=1.6), \
            "massCode > Settings… menu item not found"
        press_labelled_group(ax, "Storage")
        time.sleep(1.0)
        n1 = snippet_count(ax)
        screenshot_assert(
            "computation_storage_count",
            "massCode Preferences surface with the Storage pane selected. The left rail "
            "lists Storage / Editor / Markdown / Appearance / Language. The pane shows the "
            "storage path text field with the Move Storage, Open Storage, New Storage and "
            "Reload Storage buttons, the Migrate section (From massCode v1.0 / From "
            "SnippetsLab) and a Count row reading 'N snippets.' — one more than before the "
            "new snippet was created.")
        assert n1 is not None, \
            f"no 'N snippets.' label in Preferences > Storage; labels={labels(ax)[:30]}"

        assert rb_enter_close_surface(ax), "could not leave Preferences"
        assert rb_enter_new_snippet(ax), "File > New Snippet menu item not found"

        assert rb_enter_menu(ax, ["massCode", "Settings…"], settle=1.6), \
            "massCode > Settings… menu item not found (2nd open)"
        press_labelled_group(ax, "Storage")
        time.sleep(1.0)
        n2 = snippet_count(ax)
        assert n2 is not None, \
            f"no 'N snippets.' label after creating a snippet; labels={labels(ax)[:30]}"

        assert kit.rb_value(n2, n1 + 1), \
            f"snippet count went {n1} -> {n2}, expected {n1 + 1}"
        assert n2 == n1 + 1, f"snippet count went {n1} -> {n2}, expected {n1 + 1}"
        rb_enter_close_surface(ax)