#!/usr/bin/env python3
"""Is Save reachable without scrolling, on every step? — B6, T7.8.

The proposal put actions beside the fields; on the Constraints and Sequence
steps that meant scrolling to save. The wizard's step-navigation bar is now
position:sticky at the viewport bottom - the creator's pattern, adapted to the
wizard's grid (sticky keeps its slot in the flow, so it cannot obscure a field
at any width). The T4.4 indicator already lives in the bar and rides along.

Driven at a deliberately short viewport (700px) so the tall steps genuinely
overflow - a bar that is only reachable because the page happens to fit would
pass a taller run and prove nothing.

Self-contained: throwaway SQLite, its own uvicorn, headless Edge or Chrome.
Exit 0 all passed, 1 a failure, 2 could not run.
"""
import json
import os
import re
import sys
import tempfile
import time

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

import cdp                                                           # noqa: E402
from browser_check import seed, start_server, chk, _PASS, _FAIL      # noqa: E402
from stepper_check import dismiss_dialogs                            # noqa: E402


def ascii_(v, n=280):
    return re.sub(r"\s+", " ", str(v)).encode("ascii", "replace").decode()[:n]


def settle(seconds=0.5):
    time.sleep(seconds)


BAR_JS = """(() => JSON.stringify((() => {
  const bar = document.querySelector('.step-navigation');
  if (!bar) return null;
  const r = bar.getBoundingClientRect();
  const cs = getComputedStyle(bar);
  const btn = [...bar.querySelectorAll('button')].find(b => b.offsetParent !== null);
  const br = btn ? btn.getBoundingClientRect() : null;
  return {pos: cs.position, top: r.top, bottom: r.bottom,
          btnVisible: !!br && br.top >= 0 && br.bottom <= innerHeight,
          indicator: !!bar.querySelector('#wp-draft-status-sop')};
})()))()"""


def bar(page):
    return json.loads(page.eval(BAR_JS))


def main():
    exe = cdp.find_browser()
    if not exe:
        print("no headless-capable browser found; set WP_BROWSER.")
        return 2

    tmpdir = tempfile.mkdtemp(prefix="wpsuite-bar-")
    db_path = os.path.join(tmpdir, "check.db")
    server = None
    browser = None
    try:
        tok = seed(db_path)
        port = cdp.free_port()
        base = "http://127.0.0.1:%d" % port
        server = start_server(port, db_path)

        browser = cdp.Browser(exe)
        page = browser.page()
        page.clear_cookies()
        page.set_cookie("wp_session", tok["root"])
        page.viewport(1280, 700)
        page.goto(base + "/work-package-suite.html?tab=sop")
        dismiss_dialogs(page)
        settle(2.5)
        chk("the wizard boots", page.eval("typeof goToStep === 'function'"))

        print("\n1. every step, top of page, no scrolling")
        last = page.eval("LAST_STEP")
        all_ok, detail = True, []
        for n in range(1, int(last) + 1):
            # Forward movement is gated on real input; the check is about layout,
            # so walk the steps the way the rail allows after marking them visited.
            page.eval("currentStep = %d; updateStepUI(); window.scrollTo(0,0)" % n)
            settle(0.25)
            b = bar(page)
            ok = bool(b) and b["btnVisible"]
            all_ok = all_ok and ok
            if not ok:
                detail.append((n, b))
        chk("a primary action is inside the viewport on all %s steps, unscrolled" % last,
            all_ok, ascii_(detail))

        print("\n2. the two steps that caused B6")
        for name, n in (("Sequence", 8), ("Constraints", 9)):
            page.eval("currentStep = %d; updateStepUI(); window.scrollTo(0,0)" % n)
            settle(0.3)
            tall = page.eval("document.documentElement.scrollHeight > innerHeight")
            b = bar(page)
            chk("%s: the step overflows a 700px viewport, so the check means something" % name,
                bool(tall))
            chk("%s: the bar is stuck to the viewport bottom with its button visible" % name,
                b and b["pos"] == "sticky" and b["btnVisible"], ascii_(b))
            page.eval("window.scrollTo(0, document.documentElement.scrollHeight)")
            settle(0.3)
            b2 = bar(page)
            chk("%s: still there at the bottom of the scroll" % name,
                b2 and b2["btnVisible"], ascii_(b2))

        chk("the T4.4 save-state indicator lives in the bar", bar(page)["indicator"])

        print("\n3. 390px")
        page.viewport(390, 844, mobile=True)
        settle(0.6)
        page.eval("currentStep = 9; updateStepUI(); window.scrollTo(0,0)")
        settle(0.4)
        b = bar(page)
        chk("390px: the bar is present and its button reachable without scrolling",
            b and b["btnVisible"], ascii_(b))
        page.eval("window.scrollTo(0, document.documentElement.scrollHeight)")
        settle(0.4)
        clear = json.loads(page.eval("""JSON.stringify((() => {
          const bar = document.querySelector('.step-navigation').getBoundingClientRect();
          const fields = [...document.querySelectorAll(
            '.step-content input, .step-content textarea, .step-content select, .step-content button')]
            .filter(el => el.offsetParent !== null);
          const lastEl = fields[fields.length - 1];
          const r = lastEl ? lastEl.getBoundingClientRect() : null;
          return {barTop: bar.top, lastBottom: r ? r.bottom : null};
        })())"""))
        chk("390px: fully scrolled, the last control sits ABOVE the bar - nothing is obscured",
            clear["lastBottom"] is not None and clear["lastBottom"] <= clear["barTop"] + 1,
            ascii_(clear))

        js_errors = [e for e in page.js_errors()]
        chk("no JavaScript errors anywhere in this run", not js_errors,
            ascii_(js_errors[:2]))

    finally:
        if browser is not None:
            try:
                browser.close()
            except Exception:
                pass
        if server is not None:
            try:
                server.terminate()
            except Exception:
                pass

    print("\n" + "-" * 54)
    print("%d/%d checks passed." % (len(_PASS), len(_PASS) + len(_FAIL)))
    for f in _FAIL:
        print("  - " + f)
    return 1 if _FAIL else 0


if __name__ == "__main__":
    sys.exit(main())