"""
Account service s-expression page components.

Renders account dashboard, newsletters, fragment pages, login, and device
auth pages.  Called from route handlers in place of ``render_template()``.
"""
from __future__ import annotations

from typing import Any

from shared.sexp.jinja_bridge import sexp
from shared.sexp.helpers import (
    call_url, root_header_html, search_desktop_html,
    search_mobile_html, full_page, oob_page,
)


# ---------------------------------------------------------------------------
# Header helpers
# ---------------------------------------------------------------------------

def _auth_nav_html(ctx: dict) -> str:
    """Auth section desktop nav items."""
    html = sexp(
        '(~nav-link :href h :label "newsletters" :select-colours sc)',
        h=call_url(ctx, "account_url", "/newsletters/"),
        sc=ctx.get("select_colours", ""),
    )
    account_nav_html = ctx.get("account_nav_html", "")
    if account_nav_html:
        html += account_nav_html
    return html


def _auth_header_html(ctx: dict, *, oob: bool = False) -> str:
    """Build the account section header row."""
    return sexp(
        '(~menu-row :id "auth-row" :level 1 :colour "sky"'
        ' :link-href lh :link-label "account" :icon "fa-solid fa-user"'
        ' :nav-html nh :child-id "auth-header-child" :oob oob)',
        lh=call_url(ctx, "account_url", "/"),
        nh=_auth_nav_html(ctx),
        oob=oob,
    )


def _auth_nav_mobile_html(ctx: dict) -> str:
    """Mobile nav menu for auth section."""
    html = sexp(
        '(~nav-link :href h :label "newsletters" :select-colours sc)',
        h=call_url(ctx, "account_url", "/newsletters/"),
        sc=ctx.get("select_colours", ""),
    )
    account_nav_html = ctx.get("account_nav_html", "")
    if account_nav_html:
        html += account_nav_html
    return html


# ---------------------------------------------------------------------------
# Account dashboard (GET /)
# ---------------------------------------------------------------------------

def _account_main_panel_html(ctx: dict) -> str:
    """Account info panel with user details and logout."""
    from quart import g
    from shared.browser.app.csrf import generate_csrf_token

    user = getattr(g, "user", None)
    error = ctx.get("error", "")

    parts = ['<div class="w-full max-w-3xl mx-auto px-4 py-6">',
             '<div class="bg-white/70 backdrop-blur rounded-2xl shadow border border-stone-200 p-6 sm:p-8 space-y-8">']

    if error:
        parts.append(
            f'<div class="rounded-lg border border-red-200 bg-red-50 text-red-800 px-4 py-3 text-sm">{error}</div>'
        )

    # Account header with logout
    parts.append('<div class="flex items-center justify-between"><div>')
    parts.append('<h1 class="text-xl font-semibold tracking-tight">Account</h1>')
    if user:
        parts.append(f'<p class="text-sm text-stone-500 mt-1">{user.email}</p>')
        if user.name:
            parts.append(f'<p class="text-sm text-stone-600">{user.name}</p>')
    parts.append('</div>')
    parts.append(
        f'<form action="/auth/logout/" method="post">'
        f'<input type="hidden" name="csrf_token" value="{generate_csrf_token()}">'
        f'<button type="submit" class="inline-flex items-center gap-2 rounded-full border border-stone-300 px-4 py-2 text-sm font-medium text-stone-700 hover:bg-stone-50 transition">'
        f'<i class="fa-solid fa-right-from-bracket text-xs"></i> Sign out</button></form>'
    )
    parts.append('</div>')

    # Labels
    if user and hasattr(user, "labels") and user.labels:
        parts.append('<div><h2 class="text-base font-semibold tracking-tight mb-3">Labels</h2>')
        parts.append('<div class="flex flex-wrap gap-2">')
        for label in user.labels:
            parts.append(
                f'<span class="inline-flex items-center rounded-full border border-stone-200 px-3 py-1 text-xs font-medium bg-white/60">'
                f'{label.name}</span>'
            )
        parts.append('</div></div>')

    parts.append('</div></div>')
    return "".join(parts)


# ---------------------------------------------------------------------------
# Newsletters (GET /newsletters/)
# ---------------------------------------------------------------------------

def _newsletter_toggle_html(un: Any, account_url_fn: Any, csrf_token: str) -> str:
    """Render a single newsletter toggle switch."""
    nid = un.newsletter_id
    toggle_url = account_url_fn(f"/newsletter/{nid}/toggle/")
    if un.subscribed:
        bg = "bg-emerald-500"
        translate = "translate-x-6"
        checked = "true"
    else:
        bg = "bg-stone-300"
        translate = "translate-x-1"
        checked = "false"
    return (
        f'<div id="nl-{nid}" class="flex items-center">'
        f'<button hx-post="{toggle_url}"'
        f' hx-headers=\'{{"X-CSRFToken": "{csrf_token}"}}\''
        f' hx-target="#nl-{nid}" hx-swap="outerHTML"'
        f' class="relative inline-flex h-6 w-11 items-center rounded-full transition-colors'
        f' focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:ring-offset-2 {bg}"'
        f' role="switch" aria-checked="{checked}">'
        f'<span class="inline-block h-4 w-4 rounded-full bg-white shadow transform transition-transform {translate}"></span>'
        f'</button></div>'
    )


def _newsletters_panel_html(ctx: dict, newsletter_list: list) -> str:
    """Newsletters management panel."""
    from shared.browser.app.csrf import generate_csrf_token

    account_url_fn = ctx.get("account_url")
    csrf = generate_csrf_token()

    parts = ['<div class="w-full max-w-3xl mx-auto px-4 py-6">',
             '<div class="bg-white/70 backdrop-blur rounded-2xl shadow border border-stone-200 p-6 sm:p-8 space-y-6">',
             '<h1 class="text-xl font-semibold tracking-tight">Newsletters</h1>']

    if newsletter_list:
        parts.append('<div class="divide-y divide-stone-100">')
        for item in newsletter_list:
            nl = item["newsletter"]
            un = item.get("un")
            parts.append('<div class="flex items-center justify-between py-4 first:pt-0 last:pb-0">')
            parts.append(f'<div class="min-w-0 flex-1"><p class="text-sm font-medium text-stone-800">{nl.name}</p>')
            if nl.description:
                parts.append(f'<p class="text-xs text-stone-500 mt-0.5 truncate">{nl.description}</p>')
            parts.append('</div><div class="ml-4 flex-shrink-0">')

            if un:
                parts.append(_newsletter_toggle_html(un, account_url_fn, csrf))
            else:
                # No subscription yet — show off toggle
                toggle_url = account_url_fn(f"/newsletter/{nl.id}/toggle/")
                parts.append(
                    f'<div id="nl-{nl.id}" class="flex items-center">'
                    f'<button hx-post="{toggle_url}"'
                    f' hx-headers=\'{{"X-CSRFToken": "{csrf}"}}\''
                    f' hx-target="#nl-{nl.id}" hx-swap="outerHTML"'
                    f' class="relative inline-flex h-6 w-11 items-center rounded-full transition-colors'
                    f' focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:ring-offset-2 bg-stone-300"'
                    f' role="switch" aria-checked="false">'
                    f'<span class="inline-block h-4 w-4 rounded-full bg-white shadow transform transition-transform translate-x-1"></span>'
                    f'</button></div>'
                )
            parts.append('</div></div>')
        parts.append('</div>')
    else:
        parts.append('<p class="text-sm text-stone-500">No newsletters available.</p>')

    parts.append('</div></div>')
    return "".join(parts)


# ---------------------------------------------------------------------------
# Auth pages (login, device, check_email)
# ---------------------------------------------------------------------------

def _login_page_content(ctx: dict) -> str:
    """Login form content."""
    from shared.browser.app.csrf import generate_csrf_token
    from quart import url_for

    error = ctx.get("error", "")
    email = ctx.get("email", "")

    parts = ['<div class="py-8 max-w-md mx-auto">',
             '<h1 class="text-2xl font-bold mb-6">Sign in</h1>']
    if error:
        parts.append(
            f'<div class="bg-red-50 border border-red-200 text-red-700 p-3 rounded mb-4">{error}</div>'
        )
    action = url_for("auth.start_login")
    parts.append(
        f'<form method="post" action="{action}" class="space-y-4">'
        f'<input type="hidden" name="csrf_token" value="{generate_csrf_token()}">'
        f'<div><label for="email" class="block text-sm font-medium mb-1">Email address</label>'
        f'<input type="email" name="email" id="email" value="{email}" required autofocus'
        f' class="w-full border border-stone-300 rounded px-3 py-2 focus:outline-none focus:ring-2 focus:ring-stone-500"></div>'
        f'<button type="submit" class="w-full bg-stone-800 text-white py-2 px-4 rounded hover:bg-stone-700 transition">'
        f'Send magic link</button></form>'
    )
    parts.append('</div>')
    return "".join(parts)


def _device_page_content(ctx: dict) -> str:
    """Device authorization form content."""
    from shared.browser.app.csrf import generate_csrf_token
    from quart import url_for

    error = ctx.get("error", "")
    code = ctx.get("code", "")

    parts = ['<div class="py-8 max-w-md mx-auto">',
             '<h1 class="text-2xl font-bold mb-6">Authorize device</h1>',
             '<p class="text-stone-600 mb-4">Enter the code shown in your terminal to sign in.</p>']
    if error:
        parts.append(
            f'<div class="bg-red-50 border border-red-200 text-red-700 p-3 rounded mb-4">{error}</div>'
        )
    action = url_for("auth.device_submit")
    parts.append(
        f'<form method="post" action="{action}" class="space-y-4">'
        f'<input type="hidden" name="csrf_token" value="{generate_csrf_token()}">'
        f'<div><label for="code" class="block text-sm font-medium mb-1">Device code</label>'
        f'<input type="text" name="code" id="code" value="{code}" placeholder="XXXX-XXXX"'
        f' required autofocus maxlength="9" autocomplete="off" spellcheck="false"'
        f' class="w-full border border-stone-300 rounded px-3 py-3 text-center text-2xl tracking-widest font-mono uppercase focus:outline-none focus:ring-2 focus:ring-stone-500"></div>'
        f'<button type="submit" class="w-full bg-stone-800 text-white py-2 px-4 rounded hover:bg-stone-700 transition">'
        f'Authorize</button></form>'
    )
    parts.append('</div>')
    return "".join(parts)


def _device_approved_content() -> str:
    """Device approved success content."""
    return (
        '<div class="py-8 max-w-md mx-auto text-center">'
        '<h1 class="text-2xl font-bold mb-4">Device authorized</h1>'
        '<p class="text-stone-600">You can close this window and return to your terminal.</p>'
        '</div>'
    )


# ---------------------------------------------------------------------------
# Public API: Account dashboard
# ---------------------------------------------------------------------------

async def render_account_page(ctx: dict) -> str:
    """Full page: account dashboard."""
    main = _account_main_panel_html(ctx)

    hdr = root_header_html(ctx)
    hdr += sexp(
        '(div :id "root-header-child" :class "flex flex-col w-full items-center" (raw! a))',
        a=_auth_header_html(ctx),
    )

    return full_page(ctx, header_rows_html=hdr,
                     content_html=main,
                     menu_html=_auth_nav_mobile_html(ctx))


async def render_account_oob(ctx: dict) -> str:
    """OOB response for account dashboard."""
    main = _account_main_panel_html(ctx)

    oobs = (
        _auth_header_html(ctx, oob=True)
        + root_header_html(ctx, oob=True)
    )

    return oob_page(ctx, oobs_html=oobs,
                    content_html=main,
                    menu_html=_auth_nav_mobile_html(ctx))


# ---------------------------------------------------------------------------
# Public API: Newsletters
# ---------------------------------------------------------------------------

async def render_newsletters_page(ctx: dict, newsletter_list: list) -> str:
    """Full page: newsletters."""
    main = _newsletters_panel_html(ctx, newsletter_list)

    hdr = root_header_html(ctx)
    hdr += sexp(
        '(div :id "root-header-child" :class "flex flex-col w-full items-center" (raw! a))',
        a=_auth_header_html(ctx),
    )

    return full_page(ctx, header_rows_html=hdr,
                     content_html=main,
                     menu_html=_auth_nav_mobile_html(ctx))


async def render_newsletters_oob(ctx: dict, newsletter_list: list) -> str:
    """OOB response for newsletters."""
    main = _newsletters_panel_html(ctx, newsletter_list)

    oobs = (
        _auth_header_html(ctx, oob=True)
        + root_header_html(ctx, oob=True)
    )

    return oob_page(ctx, oobs_html=oobs,
                    content_html=main,
                    menu_html=_auth_nav_mobile_html(ctx))


# ---------------------------------------------------------------------------
# Public API: Fragment pages
# ---------------------------------------------------------------------------

async def render_fragment_page(ctx: dict, page_fragment_html: str) -> str:
    """Full page: fragment-provided content."""
    hdr = root_header_html(ctx)
    hdr += sexp(
        '(div :id "root-header-child" :class "flex flex-col w-full items-center" (raw! a))',
        a=_auth_header_html(ctx),
    )

    return full_page(ctx, header_rows_html=hdr,
                     content_html=page_fragment_html,
                     menu_html=_auth_nav_mobile_html(ctx))


async def render_fragment_oob(ctx: dict, page_fragment_html: str) -> str:
    """OOB response for fragment pages."""
    oobs = (
        _auth_header_html(ctx, oob=True)
        + root_header_html(ctx, oob=True)
    )

    return oob_page(ctx, oobs_html=oobs,
                    content_html=page_fragment_html,
                    menu_html=_auth_nav_mobile_html(ctx))


# ---------------------------------------------------------------------------
# Public API: Auth pages (login, device)
# ---------------------------------------------------------------------------

async def render_login_page(ctx: dict) -> str:
    """Full page: login form."""
    hdr = root_header_html(ctx)
    return full_page(ctx, header_rows_html=hdr,
                     content_html=_login_page_content(ctx),
                     meta_html='<title>Login \u2014 Rose Ash</title>')


async def render_device_page(ctx: dict) -> str:
    """Full page: device authorization form."""
    hdr = root_header_html(ctx)
    return full_page(ctx, header_rows_html=hdr,
                     content_html=_device_page_content(ctx),
                     meta_html='<title>Authorize Device \u2014 Rose Ash</title>')


async def render_device_approved_page(ctx: dict) -> str:
    """Full page: device approved."""
    hdr = root_header_html(ctx)
    return full_page(ctx, header_rows_html=hdr,
                     content_html=_device_approved_content(),
                     meta_html='<title>Device Authorized \u2014 Rose Ash</title>')