"""FT spec for the Bud btn sprint — post.html bottom-left handshake button.

Written red BEFORE implementation as a TDD handoff so the post-compaction
agent (or future Disco) can land the feature without losing intent. Run:

    python src/manage.py test functional_tests.test_bud_btn

All tests should be RED initially. Implementation lands when they go green.

────────────────────────────────────────────────────────────────────────────
SPEC SUMMARY
────────────────────────────────────────────────────────────────────────────

  • A new #id_bud_btn (<i class="fa-solid fa-handshake">) sits bottom-left
    of the viewport — mirror of #id_kit_btn (bottom-right). Shares the same
    fixed/circular/secUser-bordered look + .active-state styling.
  • Lives in a partial template, e.g. apps/billboard/_partials/_bud_panel.html,
    included only by post.html (NOT the global base.html — bud is post-only).
  • Replaces the inline share form on post.html: typing the recipient now
    happens in a slide-out under the bud btn.
  • Click #id_bud_btn → recipient field grows L→R under it, spanning
    `100vw - 3rem` (1.5rem padding each side). The field is vertically
    centred on the bud btn's centre, w. healthy left padding so the typed
    text + placeholder don't overlap the btn glyph.
  • An OK btn (.btn.btn-confirm) is tacked on the trailing edge of the
    field (replaces the legacy big SHARE .btn-primary).
  • While the recipient field is open: html.bud-open is set; #id_kit_btn
    quickly eases to opacity 0. Symmetric: when html.kit-open is set,
    #id_bud_btn eases to opacity 0.
  • Click OK → POST share-post async (existing C3.b endpoint), clears the
    field, closes the slide-out, slide-down Brief banner appears.
  • Click outside the field/btn → closes the slide-out, clears the field
    (no Brief). Reopening shows the placeholder, not the prior typed value.
  • Escape key closes the slide-out (same as kit btn pattern).
  • post.html + my_posts.html should be aperture-styled (body.page-billboard
    or new body.page-post if needed; the user noted post.html isn't
    currently in the base/applet scss aperture group).

────────────────────────────────────────────────────────────────────────────
IMPLEMENTATION CHECKLIST (post-compaction)
────────────────────────────────────────────────────────────────────────────

  1. Create templates/apps/billboard/_partials/_bud_panel.html w. the btn
     + slide-out form + inline JS.
  2. Edit templates/apps/billboard/post.html:
     - Drop the inline `<form id=id_share_form>` + #id_recipient + SHARE btn
       block (the share JS moves into _bud_panel.html).
     - Add `{% include "apps/billboard/_partials/_bud_panel.html" %}`.
  3. Edit billboard.views.view_post (or my_posts) context:
     - "page_class": "page-billboard" (or new page-post) so the body class
       picks up the aperture SCSS.
  4. SCSS — add to _game-kit.scss neighbour or new _bud.scss:
     - #id_bud_btn: position fixed bottom-left, mirror of #id_kit_btn
       (3rem circle, secUser border, .active state, etc.)
     - #id_bud_panel (the slide-out wrapper): position fixed,
       left: 1.5rem, right: 1.5rem (or 1.5rem + #id_kit_btn width when
       kit btn visible — but mutual-exclusion makes that moot), bottom-
       aligned w. the btn centre, transition transform/width L→R.
     - html.bud-open #id_kit_btn { opacity: 0; transition: opacity 0.15s; }
     - html.kit-open    #id_bud_btn { opacity: 0; transition: opacity 0.15s; }
     - The OK .btn-confirm gets normal btn-pad styling; flex-shrink:0 on
       the trailing edge of the slide-out.
  5. JS in _bud_panel.html:
     - Mirror game-kit.js click/escape/click-outside pattern.
     - Toggle html.bud-open + #id_bud_btn.active.
     - On submit/OK: fetch POST share-post w. Accept:application/json,
       reuse the C3.b response handling (line append, banner via
       Brief.showBanner, recipient_display chip append).
     - On dismiss-without-OK: clear input.value.
  6. post.html + my_posts.html: add the body class hook so the aperture
     SCSS engages (probably page-billboard already, just need to confirm).
  7. Update functional_tests.post_page.PostPage.share_post_with() to
     drive the bud-btn flow (click btn → type → click OK → wait for chip).
  8. Re-run test_sharing.SharingTest — should still pass once the page-
     object mirrors the new flow.

────────────────────────────────────────────────────────────────────────────
KNOWN AT TIME OF WRITING
────────────────────────────────────────────────────────────────────────────
  - #id_kit_btn lives in templates/core/base.html (line ~55), styled in
    static_src/scss/_game-kit.scss; toggled by apps/dashboard/static/.../game-kit.js.
  - The C3.b share-post async endpoint accepts Accept: application/json,
    returns {brief, line_text, recipient_display}; intercepted by the
    inline JS in post.html's existing #id_share_form. That JS moves into
    _bud_panel.html.
  - body.page-billboard class is set by billboard:billboard view; post.html
    needs it (or its own class) added in billboard.views.view_post.
"""

from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys

from apps.applets.models import Applet
from apps.billboard.models import Brief, Line, Post
from apps.lyric.models import User

from .base import FunctionalTest


def _seed_a_post(user):
    """Create a Post w. one Line so view_post renders w/o redirect."""
    p = Post.objects.create(owner=user, title="seed line")
    Line.objects.create(post=p, text="seed line", author=user)
    return p


class BudBtnPresenceTest(FunctionalTest):
    """The bud btn is post-only — present on post.html, absent elsewhere."""

    def setUp(self):
        super().setUp()
        Applet.objects.get_or_create(
            slug="my-posts",
            defaults={"name": "My Posts", "grid_cols": 4, "grid_rows": 3, "context": "billboard"},
        )
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")

    # ── B1 ──────────────────────────────────────────────────────────────────

    def test_bud_btn_renders_on_post_html(self):
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        icon = btn.find_element(By.CSS_SELECTOR, "i.fa-solid.fa-handshake")
        self.assertIsNotNone(icon)

    # ── B2 ──────────────────────────────────────────────────────────────────

    def test_bud_btn_absent_on_dashboard(self):
        self.browser.get(self.live_server_url + "/")
        # Allow page to settle
        self.wait_for(lambda: self.browser.find_element(By.ID, "id_kit_btn"))
        self.assertFalse(self.browser.find_elements(By.ID, "id_bud_btn"))

    # ── B3 ──────────────────────────────────────────────────────────────────

    def test_bud_btn_absent_on_billboard_index(self):
        self.browser.get(self.live_server_url + "/billboard/")
        self.wait_for(lambda: self.browser.find_element(By.ID, "id_kit_btn"))
        self.assertFalse(self.browser.find_elements(By.ID, "id_bud_btn"))


class BudBtnPositionTest(FunctionalTest):
    """The btn sits bottom-left, mirror of #id_kit_btn's bottom-right."""

    def setUp(self):
        super().setUp()
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")

    def test_bud_btn_is_fixed_bottom_left(self):
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        cs = self.browser.execute_script(
            "var s = getComputedStyle(arguments[0]); "
            "return {position: s.position, bottom: s.bottom, left: s.left, right: s.right};",
            btn,
        )
        self.assertEqual(cs["position"], "fixed")
        # bottom + left are non-auto/0; right is auto (or large) so the btn
        # hugs the bottom-left corner.
        self.assertNotEqual(cs["bottom"], "auto")
        self.assertNotEqual(cs["left"], "auto")

    def test_bud_btn_size_matches_kit_btn(self):
        """Same circular-3rem look — visually a mirror pair."""
        btn = self.browser.find_element(By.ID, "id_bud_btn")
        kit = self.browser.find_element(By.ID, "id_kit_btn")
        b_box = btn.size
        k_box = kit.size
        self.assertEqual(b_box["width"], k_box["width"])
        self.assertEqual(b_box["height"], k_box["height"])


class BudBtnSlideOutTest(FunctionalTest):
    """Click the bud btn → recipient field + OK btn slide out under it."""

    def setUp(self):
        super().setUp()
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")

    def test_recipient_field_hidden_until_click(self):
        """Pre-click: the field is in DOM but visually closed (e.g. width 0
        or transform scaleX(0)) — assertion checks it doesn't take its full
        viewport-spanning width yet."""
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        # The field+OK panel is rendered (so JS can transition it) but should
        # be in a closed state — assert the panel container exists and the
        # input is not displayed at full width (a CSS-driven slide-out).
        panel = self.browser.find_element(By.ID, "id_bud_panel")
        # Before click, panel visible-width should be < viewport / 2 (closed)
        viewport_w = self.browser.execute_script("return window.innerWidth;")
        self.assertLess(panel.size["width"], viewport_w / 2)

    def test_click_bud_btn_reveals_recipient_field_and_ok_btn(self):
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        btn.click()

        recipient = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        self.assertTrue(recipient.is_displayed())

        # OK btn is .btn.btn-confirm tacked onto the panel — not a big SHARE
        ok = self.browser.find_element(By.CSS_SELECTOR, "#id_bud_panel .btn.btn-confirm")
        self.assertEqual(ok.text.strip().upper(), "OK")
        # Bud btn picks up .active when open (mirror kit-btn pattern)
        self.assertIn("active", btn.get_attribute("class"))

    def test_panel_spans_almost_full_viewport_when_open(self):
        """When open, the panel spans 100vw - 3rem (1.5rem each side)."""
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        btn.click()
        panel = self.browser.find_element(By.ID, "id_bud_panel")
        # Wait for the slide-out transition to settle
        self.wait_for(lambda: self.assertGreater(
            panel.size["width"],
            self.browser.execute_script("return window.innerWidth;") * 0.7,
        ))

    def test_recipient_input_has_left_padding_so_glyph_doesnt_overlap(self):
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        btn.click()
        recipient = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        pad = self.browser.execute_script(
            "return parseFloat(getComputedStyle(arguments[0]).paddingLeft);",
            recipient,
        )
        # At least 2.5rem (40px-ish) so the bud glyph (3rem circle) doesn't
        # overlap the placeholder/typed text.
        self.assertGreaterEqual(pad, 32)


class BudKitMutualExclusionTest(FunctionalTest):
    """When kit btn is active, bud btn fades to 0 — and vice-versa."""

    def setUp(self):
        super().setUp()
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")

    def test_bud_active_fades_kit_btn(self):
        bud = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        kit = self.browser.find_element(By.ID, "id_kit_btn")
        bud.click()
        self.wait_for(lambda: self.assertEqual(
            self.browser.execute_script(
                "return parseFloat(getComputedStyle(arguments[0]).opacity);",
                kit,
            ),
            0.0,
        ))

    def test_kit_active_fades_bud_btn(self):
        kit = self.wait_for(lambda: self.browser.find_element(By.ID, "id_kit_btn"))
        bud = self.browser.find_element(By.ID, "id_bud_btn")
        kit.click()
        self.wait_for(lambda: self.assertEqual(
            self.browser.execute_script(
                "return parseFloat(getComputedStyle(arguments[0]).opacity);",
                bud,
            ),
            0.0,
        ))


class BudBtnDismissTest(FunctionalTest):
    """Click outside / Escape closes the panel; field is cleared; reopening
    shows the placeholder, not the previously-typed value."""

    def setUp(self):
        super().setUp()
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")

    def _open_and_type(self, text):
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        btn.click()
        recipient = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        recipient.send_keys(text)
        return btn, recipient

    def test_click_outside_dismisses_and_clears(self):
        btn, recipient = self._open_and_type("alice@test.io")
        # Click somewhere far from the panel + btn
        body = self.browser.find_element(By.TAG_NAME, "body")
        self.browser.execute_script(
            "var e = new MouseEvent('click', {bubbles:true, clientX: 100, clientY: 100});"
            "document.querySelector('h2').dispatchEvent(e);"
        )
        self.wait_for(lambda: self.assertNotIn("active", btn.get_attribute("class")))
        # Reopening: input value should be cleared
        btn.click()
        recipient = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        self.assertEqual(recipient.get_attribute("value"), "")

    def test_escape_dismisses_and_clears(self):
        btn, recipient = self._open_and_type("alice@test.io")
        recipient.send_keys(Keys.ESCAPE)
        self.wait_for(lambda: self.assertNotIn("active", btn.get_attribute("class")))
        btn.click()
        recipient = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        self.assertEqual(recipient.get_attribute("value"), "")


class BudBtnOkSubmitsAsyncShareTest(FunctionalTest):
    """OK → POST share-post (Accept:application/json) → Brief banner +
    recipient chip appended; field clears; panel closes."""

    def setUp(self):
        super().setUp()
        self.sharer = User.objects.create(email="bud@test.io")
        self.recipient = User.objects.create(email="alice@test.io")
        self.post = _seed_a_post(self.sharer)
        self.create_pre_authenticated_session("bud@test.io")
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")

    def test_ok_creates_brief_appends_line_and_chip(self):
        btn = self.wait_for(lambda: self.browser.find_element(By.ID, "id_bud_btn"))
        btn.click()
        recipient_input = self.wait_for(lambda: self.browser.find_element(By.ID, "id_recipient"))
        recipient_input.send_keys("alice@test.io")
        ok = self.browser.find_element(By.CSS_SELECTOR, "#id_bud_panel .btn.btn-confirm")
        ok.click()

        # 1. Brief is created server-side
        self.wait_for(lambda: self.assertEqual(
            Brief.objects.filter(owner=self.sharer, kind=Brief.KIND_SHARE_INVITE).count(),
            1,
        ))
        # 2. Banner appears
        self.wait_for(lambda: self.browser.find_element(By.CSS_SELECTOR, ".note-banner"))
        # 3. .post-recipient chip appended
        self.wait_for(lambda: self.assertTrue(
            self.browser.find_elements(By.CSS_SELECTOR, ".post-recipient")
        ))
        # 4. Field cleared
        recipient_input = self.browser.find_element(By.ID, "id_recipient")
        self.assertEqual(recipient_input.get_attribute("value"), "")
        # 5. Panel closed (btn no longer .active)
        self.wait_for(lambda: self.assertNotIn("active", btn.get_attribute("class")))


class PostHtmlAperturePageClassTest(FunctionalTest):
    """post.html and my_posts.html should pick up the aperture body class
    so they share the navbar/footer scroll-lock pattern w. sky.html etc."""

    def setUp(self):
        super().setUp()
        Applet.objects.get_or_create(
            slug="my-posts",
            defaults={"name": "My Posts", "grid_cols": 4, "grid_rows": 3, "context": "billboard"},
        )
        self.gamer = User.objects.create(email="bud@test.io")
        self.post = _seed_a_post(self.gamer)
        self.create_pre_authenticated_session("bud@test.io")

    def test_post_html_body_carries_billboard_or_post_page_class(self):
        self.browser.get(self.live_server_url + f"/billboard/post/{self.post.id}/")
        body = self.wait_for(lambda: self.browser.find_element(By.TAG_NAME, "body"))
        cls = body.get_attribute("class")
        self.assertTrue(
            "page-billboard" in cls or "page-billpost" in cls,
            f"post.html body class missing aperture marker: {cls!r}",
        )

    def test_my_posts_html_body_carries_billboard_or_post_page_class(self):
        self.browser.get(self.live_server_url + f"/billboard/users/{self.gamer.id}/")
        body = self.wait_for(lambda: self.browser.find_element(By.TAG_NAME, "body"))
        cls = body.get_attribute("class")
        self.assertTrue(
            "page-billboard" in cls or "page-billpost" in cls,
            f"my_posts.html body class missing aperture marker: {cls!r}",
        )