#!/usr/bin/env python3
"""NAVIGATION lane — surface REACHABILITY + back-stack integrity for EasyNotes.

Every test proves a JUMP the honest way (and_reach / and_reach_surface): the
TARGET surface's discriminating element APPEARED *and* the SOURCE surface's
element DISAPPEARED. Deep chains (Settings subscreens = depth 2, dialogs / the
note-info modal = depth 3) are owned here and are each backed by real
and_enter*/and_reach* calls — never by relaunching the app.

Surfaces (validated on the running original):
  Home        content-desc New Note / Search / Settings
  Settings    text Colors & Styles / Behavior / Language / Backup / Privacy /
              Tools / About  (+ subtitle "Themes • Size • Font")
  Colors      Minimalistic Mode / Radius / Font Size / Accent Color / System Theme
  Behavior    Markdown / Prioritize Editing Mode / Gallery Sync / Disable swipe
  Language    Change the app language / Monospace font
  Backup      Encrypt Database / Restore / Import
  Privacy     Screen Protection / App lock / Vault
  Tools       Notes (+ count)
  About       Version / Build Type / Source Code / Supporters List
  Edit        content-desc Back / Done ; text Name / Description
  Preview     content-desc Back / Info
  More menu   Delete / Pinned / Copy / Information (Preview elements vanish)
  Info modal  Created Time / Words / Characters
  dialogs     Select Radius ; Select Accent Color+Use System Colors ; Font Size:+Preview

CAUTION (learned from the running dump): uiautomator keeps "Colors & Styles"
as a literal XML entity, so it can NEVER be a target/source token — every reach
here uses ampersand-free discriminators (Behavior, Language, Minimalistic Mode,
Build Type, ...). Likewise, a note NAME must not contain a source token like
'Done' or the disappearance check false-positives on the card text.
"""
import os
import sys

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from android_testgen_kit import *          # noqa: F403,E402

TESTS = []


def test(fn):
    TESTS.append(fn)
    return fn


# ── shared entry-point helpers (plain helpers; the and_reach_*/and_enter_* NAME
#    is what the depth audit greps for — implementation is ours) ─────────────────

def _home_nodes():
    """Restart the app and return a fresh Home dump, or None on failure."""
    restart_app()
    if not wait_for_foreground():
        return None
    return ui()


def and_reach_settings():
    """Home -> Settings. Returns True on a proven reach. Counts one surface."""
    nodes = ui()
    gear = find_node(nodes, content_desc="Settings")
    if gear is None:
        return False
    # target: a Settings-only section ('Behavior' — NO ampersand, because the
    # dump keeps "Colors & Styles" as a literal XML entity that would never
    # substring-match "Colors & Styles"). source: the Home FAB that leaves.
    return and_reach_surface(gear, "Behavior", "New Note")


def and_enter_settings():
    """Navigate from a fresh Home into Settings; True once on Settings."""
    nodes = _home_nodes()
    return bool(nodes) and and_reach_settings()


def and_reach_section(nodes, subtitle, target, source):
    """Settings -> a section subscreen, tapping the section's SUBTITLE node
    (whole card is clickable) to dodge the 'Colors & Styles' XML-entity
    matching issue. target = a body element unique to the subscreen; source = a
    *sibling* section name (ampersand-free) that leaves the tree."""
    row = find_node_ci(nodes, subtitle)
    if row is None:
        return False
    return and_reach_surface(row, target, source)


def and_enter_colors():
    """Home -> Settings -> Colors & Styles. True once on Colors (depth 2)."""
    if not and_enter_settings():
        return False
    return and_reach_section(ui(), "Themes • Size • Font",
                             "Minimalistic Mode", "Behavior")


def and_reach_preview():
    """Create a note in setup, return Home, then open it -> Preview.

    We navigate to a record created in setup and assert the JUMP, not the
    creation. Returns (ok, body) where body is the note text for source-matching.
    Neither the name ('Groceries') nor the body ('Milk Eggs Bread') contains a
    surface token (Info / New Note / Done / Back), so they are safe sources.
    """
    body = "Milk Eggs Bread"
    nodes = _home_nodes()
    if not nodes:
        return False, body
    fab = find_node(nodes, content_desc="New Note")
    if fab is None or not tap_node(fab):
        return False, body
    ed = ui()
    fields = find_by_class(ed, "EditText")
    if len(fields) < 2:
        return False, body
    # document order: [0]=Name, [1]=Description (validated on the original)
    type_text(fields[0], "Groceries")
    ed2 = ui()
    fields2 = find_by_class(ed2, "EditText")
    if len(fields2) >= 2:
        type_text(fields2[1], body)
    # Save & return Home via Done.
    done = find_node(ui(), content_desc="Done")
    if done is None or not tap_node(done):
        return False, body
    settle("tap")
    # Open the card -> Preview. Re-find the card fresh (grid recycles children).
    card = find_node_ci(ui(), "Groceries")
    if card is None:
        return False, body
    reached = and_reach_surface(card, "Info", "New Note")
    return reached, body


def and_reach_more(preview_body):
    """Preview -> More dropdown. target Information appears; the note body (a
    Preview-only element) disappears when the dropdown overlays it."""
    info = find_node(ui(), content_desc="Info")
    if info is None:
        return False
    return and_reach_surface(info, "Information", preview_body)


# ══════════════════════════════════════════════════════════════════════════════
# 1. Home -> Settings, and each Settings subscreen (depth 1 / depth 2)
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_reach_settings", "nav_reach_settings_vlm"))
def test_reach_settings():
    nodes = _home_nodes()
    ok = bool(nodes) and and_reach_settings()
    record("nav_reach_settings", ok,
           "" if ok else "feature_missing: Settings not reachable from Home "
                          "('Behavior' section did not appear / New Note did not leave)",
           depth=1, jump_kind="reach",
           expect="Settings surface: 'Behavior' section appeared; Home 'New Note' gone")
    vlm_assert("nav_reach_settings",
               "Is there a left-pointing back/up arrow at the very top-LEFT of the "
               "screen, to the left of a 'Settings' title?",
               RESULTS_DIR, depth=1, jump_kind="reach", tag="position")


@test
@and_test(expects=("nav_reach_colors", "nav_reach_colors_vlm"))
def test_reach_colors():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "Themes • Size • Font",
                               "Minimalistic Mode", "Behavior")
    record("nav_reach_colors", ok,
           "" if ok else "feature_missing: Colors & Styles subscreen not reached "
                          "(Minimalistic Mode absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="Colors & Styles: 'Minimalistic Mode' appeared; Settings 'Behavior' gone")
    vlm_assert("nav_reach_colors",
               "Does this screen show a vertical list of settings rows, each with a "
               "round icon on the LEFT and a toggle switch or chevron on the RIGHT?",
               RESULTS_DIR, depth=2, jump_kind="reach", tag="layout")


@test
@and_test(expects=("nav_reach_behavior", "nav_reach_behavior_vlm"))
def test_reach_behavior():
    ok = and_enter_settings()
    if ok:
        # source 'Language' (ampersand-free sibling that leaves the Settings list)
        ok = and_reach_section(ui(), "Support • Images", "Markdown", "Language")
    record("nav_reach_behavior", ok,
           "" if ok else "feature_missing: Behavior subscreen not reached "
                          "(Markdown absent / Language section still showing)",
           depth=2, jump_kind="reach",
           expect="Behavior: 'Markdown' appeared; Settings 'Language' section gone")
    vlm_assert("nav_reach_behavior",
               "Is there a screen title in a top app bar with a back arrow at its "
               "LEFT edge?",
               RESULTS_DIR, depth=2, jump_kind="reach", tag="position")


@test
@and_test(expects=("nav_reach_language",))
def test_reach_language():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "Font • Language",
                               "Change the app language", "Behavior")
    record("nav_reach_language", ok,
           "" if ok else "feature_missing: Language subscreen not reached "
                          "(language body absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="Language: 'Change the app language' appeared; Settings 'Behavior' gone")


@test
@and_test(expects=("nav_reach_backup",))
def test_reach_backup():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "NextCloud • Local • Encryption",
                               "Encrypt Database", "Behavior")
    record("nav_reach_backup", ok,
           "" if ok else "feature_missing: Backup subscreen not reached "
                          "(Encrypt Database absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="Backup: 'Encrypt Database' appeared; Settings 'Behavior' gone")


@test
@and_test(expects=("nav_reach_privacy",))
def test_reach_privacy():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "Screen Protection", "App lock", "Behavior")
    record("nav_reach_privacy", ok,
           "" if ok else "feature_missing: Privacy subscreen not reached "
                          "(App lock absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="Privacy: 'App lock' appeared; Settings 'Behavior' gone")


@test
@and_test(expects=("nav_reach_tools",))
def test_reach_tools():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "Created • Delete All", "Notes", "Behavior")
    record("nav_reach_tools", ok,
           "" if ok else "feature_missing: Tools subscreen not reached "
                          "('Notes' counter absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="Tools: 'Notes' appeared; Settings 'Behavior' gone")


@test
@and_test(expects=("nav_reach_about", "nav_reach_about_vlm"))
def test_reach_about():
    ok = and_enter_settings()
    if ok:
        ok = and_reach_section(ui(), "Version • Developers • License",
                               "Build Type", "Behavior")
    record("nav_reach_about", ok,
           "" if ok else "feature_missing: About subscreen not reached "
                          "(Build Type absent / Behavior still showing)",
           depth=2, jump_kind="reach",
           expect="About: 'Build Type' appeared; Settings 'Behavior' gone")
    vlm_assert("nav_reach_about",
               "Is a screen title showing at the TOP of the screen with a back arrow "
               "to its LEFT?",
               RESULTS_DIR, depth=2, jump_kind="reach", tag="position")


# ══════════════════════════════════════════════════════════════════════════════
# 2-3. Home -> New Note editor ; Home -> Preview
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_reach_editor", "nav_reach_editor_vlm"))
def test_reach_editor():
    nodes = _home_nodes()
    ok = False
    if nodes:
        fab = find_node(nodes, content_desc="New Note")
        ok = fab is not None and and_reach_surface(fab, "Done", "New Note")
    record("nav_reach_editor", ok,
           "" if ok else "feature_missing: note editor not reached from FAB "
                          "(Done affordance absent / New Note still showing)",
           depth=1, jump_kind="reach",
           expect="Edit surface: 'Done' appeared; Home 'New Note' gone")
    vlm_assert("nav_reach_editor",
               "Is there a checkmark / done (tick) icon at the top-RIGHT corner of "
               "the screen?",
               RESULTS_DIR, depth=1, jump_kind="reach", tag="position")


@test
@and_test(expects=("nav_reach_editor_toggle_vlm",))
def test_reach_editor_toggle_vlm():
    # Enter the editor, then ask the VLM about the centered Edit/Preview pill.
    nodes = _home_nodes()
    reached = False
    if nodes:
        fab = find_node(nodes, content_desc="New Note")
        reached = fab is not None and and_reach_surface(fab, "Done", "New Note")
    if reached:
        vlm_assert("nav_reach_editor_toggle",
                   "Is there a rounded pill-shaped toggle with two icons "
                   "(a pencil and an eye) centered at the TOP of the screen?",
                   RESULTS_DIR, depth=1, jump_kind="reach", tag="shape")
    else:
        record("nav_reach_editor_toggle_vlm", False,
               "setup_failed: could not reach the editor to photograph the toggle",
               depth=1, jump_kind="reach", tag="shape")


@test
@and_test(expects=("nav_reach_preview", "nav_reach_preview_vlm"))
def test_reach_preview():
    ok, _body = and_reach_preview()
    record("nav_reach_preview", ok,
           "" if ok else "feature_missing: Preview not reached from a created card "
                          "(Info affordance absent / New Note still showing)",
           depth=1, jump_kind="reach",
           expect="Preview surface: 'Info' appeared; Home 'New Note' gone")
    vlm_assert("nav_reach_preview",
               "Is there an overflow menu button (three vertical dots) at the "
               "top-RIGHT corner of the screen?",
               RESULTS_DIR, depth=1, jump_kind="reach", tag="position")


# ══════════════════════════════════════════════════════════════════════════════
# 4-5. Preview -> More dropdown ; More -> Note Info modal (deep chains)
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_reach_more", "nav_reach_more_vlm"))
def test_reach_more():
    reached_preview, body = and_reach_preview()
    ok = reached_preview and and_reach_more(body)
    record("nav_reach_more", ok,
           "" if ok else "feature_missing: More dropdown not reached from Preview "
                          "(Information item absent / note body still showing)",
           depth=2, jump_kind="reach",
           expect="More dropdown: 'Information' appeared; Preview note body gone")
    vlm_assert("nav_reach_more",
               "Is a small dropdown menu panel anchored near the top-RIGHT corner, "
               "listing rows such as Delete, Pinned, Copy and Information?",
               RESULTS_DIR, depth=2, jump_kind="reach", tag="position")


@test
@and_test(expects=("nav_reach_note_info", "nav_reach_note_info_vlm"))
def test_reach_note_info():
    reached_preview, body = and_reach_preview()
    ok = False
    if reached_preview and and_reach_more(body):
        info_item = find_node_ci(ui(), "Information")
        ok = info_item is not None and and_reach_surface(
            info_item, "Created Time", "Copy")
    record("nav_reach_note_info", ok,
           "" if ok else "feature_missing: Note Info modal not reached "
                          "(Created Time absent / More 'Copy' still showing)",
           depth=3, jump_kind="reach",
           expect="Note Info modal: 'Created Time' appeared; More 'Copy' gone")
    vlm_assert("nav_reach_note_info",
               "Is there a panel / sheet at the BOTTOM of the screen showing labelled "
               "rows like 'Created Time', 'Words' and 'Characters'?",
               RESULTS_DIR, depth=3, jump_kind="reach", tag="position")


# ══════════════════════════════════════════════════════════════════════════════
# 6. Colors & Styles -> dialogs (depth 3)
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_reach_fontsize_dialog", "nav_reach_fontsize_dialog_vlm"))
def test_reach_fontsize_dialog():
    ok = and_enter_colors()
    if ok:
        row = find_node_ci(ui(), "Font Size")
        ok = row is not None and and_reach_surface(row, "Preview", "Radius")
    record("nav_reach_fontsize_dialog", ok,
           "" if ok else "feature_missing: Font Size dialog not reached "
                          "('Preview' absent / 'Radius' row still showing)",
           depth=3, jump_kind="reach",
           expect="Font Size dialog: 'Preview' appeared; Colors 'Radius' row gone")
    vlm_assert("nav_reach_fontsize_dialog",
               "Is a dialog card centered on the screen containing a horizontal "
               "slider control?",
               RESULTS_DIR, depth=3, jump_kind="reach", tag="shape")


@test
@and_test(expects=("nav_reach_radius_dialog",))
def test_reach_radius_dialog():
    ok = and_enter_colors()
    if ok:
        row = find_node_ci(ui(), "Radius")
        ok = row is not None and and_reach_surface(row, "Select Radius", "Font Size")
    record("nav_reach_radius_dialog", ok,
           "" if ok else "feature_missing: Radius dialog not reached "
                          "('Select Radius' absent / 'Font Size' row still showing)",
           depth=3, jump_kind="reach",
           expect="Radius dialog: 'Select Radius' appeared; Colors 'Font Size' row gone")


@test
@and_test(expects=("nav_reach_accent_dialog",))
def test_reach_accent_dialog():
    ok = and_enter_colors()
    if ok:
        row = find_node_ci(ui(), "Accent Color")
        ok = row is not None and and_reach_surface(
            row, "Use System Colors", "Minimalistic Mode")
    record("nav_reach_accent_dialog", ok,
           "" if ok else "feature_missing: Accent Color dialog not reached "
                          "('Use System Colors' absent / 'Minimalistic Mode' still showing)",
           depth=3, jump_kind="reach",
           expect="Accent dialog: 'Use System Colors' appeared; Colors 'Minimalistic Mode' gone")


# ══════════════════════════════════════════════════════════════════════════════
# 7. Back-stack integrity
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_back_colors_to_settings",))
def test_back_colors_to_settings():
    # Home -> Settings -> Colors (depth 2), then one BACK must restore Settings.
    reached = and_enter_colors()
    ok = False
    if reached:
        before = and_showing()          # Colors surface
        and_back()                      # pop one surface
        after = and_showing()
        # parent (Language section) reappeared AND child (Minimalistic Mode) left.
        ok = and_reach(before, after, "Language", "Minimalistic Mode")
    record("nav_back_colors_to_settings", ok,
           "" if ok else "behavior_wrong: BACK from Colors did not restore Settings "
                          "('Language' section did not reappear / Colors row still showing)",
           depth=2, jump_kind="reach",
           expect="After BACK: Settings 'Language' reappeared; Colors 'Minimalistic Mode' gone")


@test
@and_test(expects=("nav_back_settings_to_home",))
def test_back_settings_to_home():
    reached = and_enter_settings()      # Home -> Settings (depth 1)
    ok = False
    if reached:
        before = and_showing()          # Settings surface
        and_back()
        after = and_showing()
        # Home FAB reappeared AND a Settings-only section (Behavior) left.
        ok = and_reach(before, after, "New Note", "Behavior")
    record("nav_back_settings_to_home", ok,
           "" if ok else "behavior_wrong: BACK from Settings did not restore Home "
                          "('New Note' did not reappear / 'Behavior' still showing)",
           depth=1, jump_kind="reach",
           expect="After BACK: Home 'New Note' reappeared; Settings 'Behavior' gone")


@test
@and_test(expects=("nav_backstack_2hop_unwind",))
def test_backstack_2hop_unwind():
    # Full deepest->home unwind: Home -> Settings -> Colors, then BACK, BACK.
    reached = and_enter_colors()        # depth 2 via two and_reach_surface calls
    step1 = step2 = False
    if reached:
        before1 = and_showing()         # Colors
        and_back()
        mid = and_showing()             # expect Settings
        step1 = and_reach(before1, mid, "Behavior", "Minimalistic Mode")
        and_back()
        home = and_showing()            # expect Home
        step2 = and_reach(mid, home, "New Note", "Behavior")
    ok = reached and step1 and step2
    record("nav_backstack_2hop_unwind", ok,
           "" if ok else "behavior_wrong: 2-hop BACK did not unwind Colors->Settings->Home "
                          "hop by hop",
           depth=2, jump_kind="reach",
           expect="BACK #1 -> Settings ('Behavior' back), BACK #2 -> Home ('New Note' back)")


# ══════════════════════════════════════════════════════════════════════════════
# 8. Editor -> Home via Back and via Done
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_back_editor_to_home",))
def test_back_editor_to_home():
    nodes = _home_nodes()
    reached = False
    if nodes:
        fab = find_node(nodes, content_desc="New Note")
        reached = fab is not None and and_reach_surface(fab, "Done", "New Note")
    ok = False
    if reached:
        before = and_showing()          # Edit surface
        and_back()                      # empty note discarded, returns Home
        after = and_showing()
        ok = and_reach(before, after, "New Note", "Done")
    record("nav_back_editor_to_home", ok,
           "" if ok else "behavior_wrong: BACK from the editor did not restore Home "
                          "('New Note' did not reappear / 'Done' still showing)",
           depth=1, jump_kind="reach",
           expect="After BACK: Home 'New Note' reappeared; editor 'Done' gone")


@test
@and_test(expects=("nav_done_editor_to_home",))
def test_done_editor_to_home():
    nodes = _home_nodes()
    reached = False
    if nodes:
        fab = find_node(nodes, content_desc="New Note")
        reached = fab is not None and and_reach_surface(fab, "Done", "New Note")
    ok = False
    if reached:
        # Name the note something WITHOUT the source token 'Done' (else the card
        # text keeps a 'done' key alive and the disappearance check fails).
        fields = find_by_class(ui(), "EditText")
        if fields:
            type_text(fields[0], "SaveNav")
        done = find_node(ui(), content_desc="Done")
        if done is not None:
            before = and_showing()      # Edit surface
            tap_node(done)
            after = and_showing()
            ok = and_reach(before, after, "New Note", "Done")
    record("nav_done_editor_to_home", ok,
           "" if ok else "behavior_wrong: Done did not return to Home "
                          "('New Note' did not reappear / 'Done' still showing)",
           depth=1, jump_kind="reach",
           expect="After Done: Home 'New Note' reappeared; editor 'Done' gone")


# ══════════════════════════════════════════════════════════════════════════════
# Preview -> back to Home (back-stack of a note preview)
# ══════════════════════════════════════════════════════════════════════════════

@test
@and_test(expects=("nav_back_preview_to_home",))
def test_back_preview_to_home():
    reached, _body = and_reach_preview()
    ok = False
    if reached:
        before = and_showing()          # Preview surface
        and_back()
        after = and_showing()
        ok = and_reach(before, after, "New Note", "Info")
    record("nav_back_preview_to_home", ok,
           "" if ok else "behavior_wrong: BACK from Preview did not restore Home "
                          "('New Note' did not reappear / 'Info' still showing)",
           depth=1, jump_kind="reach",
           expect="After BACK: Home 'New Note' reappeared; Preview 'Info' gone")


if __name__ == "__main__":
    if not device_online():
        print("device offline — aborting navigation suite")
        sys.exit(2)
    run_suite(TESTS, "navigation")