"""Instagram posting flow (media required).

    1. navigate instagram.com
    2. click svg[aria-label="New post"]
    3. wait for the "Create new post" dialog
    4. setFileInputFiles on the dialog's file input (bypasses the picker)
    5. crop screen   -> Next
    6. filter screen -> Next
    7. caption screen -> type caption
    8. Share
    9. dialog closes = success
"""

import asyncio
import json

from ..cdp import CDPError, human_delay
from . import guard, require_media
from ..selectors import INSTAGRAM as S

PLATFORM = "ig"


async def post(cdp_client, text, media_path=None, options=None):
    options = options or {}
    require_media(PLATFORM, media_path)

    tab, reused = await cdp_client.get_or_open_tab(S["url"], "instagram.com")
    if reused:
        await tab.eval("window.onbeforeunload = null")
        await tab.navigate(S["url"])
    return await guard(PLATFORM, tab, _flow(tab, text or "", media_path))


async def _flow(tab, caption, media_path):
    await tab.wait_for(S["new_post_svg"])
    await human_delay()
    # JS click — walks up to the clickable parent of the SVG icon
    await tab.eval(S["new_post_js"])
    await human_delay()

    await tab.wait_for(S["dialog"])
    await tab.wait_for_text(S["create_dialog_text"])

    # The file input is present but hidden — visible=False on purpose.
    await tab.wait_for(S["file_input"], visible=False)
    await tab.set_file_input(S["file_input"], media_path)

    # TODO: VALIDATE LIVE — how long IG takes to move from picker to crop, and
    # whether the crop step is skipped for already-square media.
    await human_delay(2.0, 4.0)

    # Crop -> Next, filter -> Next. Same button text on both screens, so we
    # click it twice with a settle between; if a screen is skipped the second
    # Next simply won't be there and we fail loudly rather than guessing.
    for step in ("crop", "filter"):
        await _click_next(tab, step)
        await human_delay(1.0, 2.0)

    await tab.wait_for(S["caption_box"])
    if caption:
        await tab.type_text(S["caption_box"], caption)

    await tab.click_js(S["share_button_js"])

    # TODO: VALIDATE LIVE — IG shows "Your post has been shared" before the
    # dialog closes; either signal is success, whichever lands first.
    await _wait_for_share(tab)


async def _click_next(tab, step):
    deadline = asyncio.get_running_loop().time() + 20.0
    while asyncio.get_running_loop().time() < deadline:
        found = await tab.eval("!!(%s)" % S["next_button_js"])
        if found:
            await tab.click_js(S["next_button_js"])
            return
        await asyncio.sleep(0.25)
    raise CDPError(f"ig: no 'Next' button on the {step} screen after 20s")


async def _wait_for_share(tab):
    deadline = asyncio.get_running_loop().time() + 90.0
    while asyncio.get_running_loop().time() < deadline:
        if await tab.eval(
            "document.body.innerText.includes(%s)" % json.dumps(S["shared_text"])
        ):
            # Click "Done" to dismiss the confirmation dialog
            await human_delay(0.5, 1.0)
            try:
                await tab.click_js(S["done_button_js"])
            except Exception:
                pass
            return
        if not await tab.exists(S["dialog"]):
            return
        await asyncio.sleep(0.5)
    raise CDPError("ig: no share confirmation and the dialog stayed open for 90s")


async def check_login(cdp_client):
    tab, reused = await cdp_client.get_or_open_tab(S["url"], "instagram.com", activate=False)
    if reused:
        await tab.eval("window.onbeforeunload = null")
        await tab.navigate(S["url"])
    if await tab.exists(S["login_marker"]):
        return False
    # JS state rather than the new-post SVG. The icon does survive a background
    # tab today (measured 2026-09-12), but it is an icon — it moves when the nav
    # is redesigned. The session cookie is the session.
    state = await tab.eval(
        "(() => { const m = document.cookie.match(/(?:^|;\\s*)ds_user_id=(\\d+)/);"
        " return m ? 'in:' + m[1] : (document.cookie ? 'out' : 'unavailable'); })()"
    )
    if state.startswith("in:"):
        return True
    if state == "out":
        return False
    raise CDPError("ig: no cookies readable on instagram.com — cannot tell signed-in from signed-out")