import type { Route } from '@playwright/test';
import type { ContentState } from './contentSeed';

type JsonFn = (
    route: Route,
    status: number,
    body: unknown,
    headers?: Record<string, string>
) => Promise<void>;

function listSlice<T>(items: T[], url: URL): { rows: T[]; total: number } {
    const limit = Number(url.searchParams.get('limit') || 50);
    const offset = Number(url.searchParams.get('offset') || 0);
    const q = (url.searchParams.get('q') || '').toLowerCase();
    let rows = items;
    if (q) {
        rows = items.filter((item) => JSON.stringify(item).toLowerCase().includes(q));
    }
    const status = url.searchParams.get('status');
    if (status && rows.length && typeof (rows[0] as { status?: string }).status === 'string') {
        rows = rows.filter((item) => (item as { status?: string }).status === status);
    }
    const plan = url.searchParams.get('plan');
    if (plan) {
        rows = rows.filter((item) => (item as { plan?: string }).plan === plan);
    }
    const type = url.searchParams.get('type');
    if (type) {
        rows = rows.filter((item) => (item as { type?: string }).type === type);
    }
    return { rows: rows.slice(offset, offset + limit), total: rows.length };
}

/** Returns true if the request was handled. */
export async function tryHandleContentApi(
    route: Route,
    method: string,
    path: string,
    url: URL,
    content: ContentState,
    json: JsonFn,
    postData: () => unknown
): Promise<boolean> {
    // ---- users ----
    if (method === 'GET' && path.endsWith('/v1/admin/users/stats')) {
        await json(route, 200, {
            total_users: content.users.length,
            users_by_role: {},
            users_by_status: {},
            pending_users: 0,
        });
        return true;
    }
    if (method === 'GET' && path.endsWith('/v1/admin/users')) {
        const page = listSlice(content.users, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/users\/([^/]+)$/);
        if (m) {
            const id = decodeURIComponent(m[1]);
            const idx = content.users.findIndex((u) => u.id === id);
            if (idx < 0) {
                await json(route, 404, { error: 'not_found' });
                return true;
            }
            if (method === 'GET') {
                await json(route, 200, content.users[idx]);
                return true;
            }
            if (method === 'PUT') {
                const patch = (postData() || {}) as Record<string, unknown>;
                delete patch.id;
                content.users[idx] = { ...content.users[idx], ...patch, id };
                await json(route, 200, content.users[idx]);
                return true;
            }
            if (method === 'DELETE') {
                content.users.splice(idx, 1);
                await json(route, 200, { ok: true });
                return true;
            }
        }
    }

    // ---- calendars ----
    if (method === 'GET' && path.endsWith('/v1/admin/calendars/stats')) {
        await json(route, 200, {
            total_calendars: content.calendars.length,
            calendars_by_type: {},
            calendars_by_status: {},
            top_calendars_by_reviews: [],
            top_calendars_by_positive_reviews: [],
            top_calendars_by_negative_reviews: [],
            top_calendars_by_rating: [],
        });
        return true;
    }
    if (method === 'GET' && path.endsWith('/v1/admin/calendars')) {
        const page = listSlice(content.calendars, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/calendars\/([^/]+)$/);
        if (m) {
            const id = decodeURIComponent(m[1]);
            const idx = content.calendars.findIndex((c) => c.id === id);
            if (idx < 0) {
                await json(route, 404, { error: 'not_found' });
                return true;
            }
            if (method === 'GET') {
                await json(route, 200, content.calendars[idx]);
                return true;
            }
            if (method === 'PUT') {
                const patch = (postData() || {}) as Record<string, unknown>;
                delete patch.id;
                content.calendars[idx] = { ...content.calendars[idx], ...patch, id };
                await json(route, 200, content.calendars[idx]);
                return true;
            }
            if (method === 'DELETE') {
                content.calendars.splice(idx, 1);
                await json(route, 200, { ok: true });
                return true;
            }
        }
    }

    // ---- events ----
    if (method === 'GET' && path.endsWith('/v1/admin/events/stats')) {
        await json(route, 200, {
            total_events: content.events.length,
            events_by_type: {},
            events_by_status: {},
            top_events_by_rating: [],
        });
        return true;
    }
    if (method === 'GET' && path.endsWith('/v1/admin/events')) {
        const page = listSlice(content.events, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/events\/([^/]+)$/);
        if (m) {
            const id = decodeURIComponent(m[1]);
            const idx = content.events.findIndex((e) => e.id === id);
            if (idx < 0) {
                await json(route, 404, { error: 'not_found' });
                return true;
            }
            if (method === 'GET') {
                await json(route, 200, content.events[idx]);
                return true;
            }
            if (method === 'PUT') {
                const patch = (postData() || {}) as Record<string, unknown>;
                delete patch.id;
                content.events[idx] = { ...content.events[idx], ...patch, id };
                await json(route, 200, content.events[idx]);
                return true;
            }
            if (method === 'DELETE') {
                content.events.splice(idx, 1);
                await json(route, 200, { ok: true });
                return true;
            }
        }
    }

    // ---- subscriptions ----
    if (method === 'GET' && path.endsWith('/v1/admin/subscriptions/stats')) {
        await json(route, 200, {
            total_subscriptions: content.subscriptions.length,
            subscriptions_by_plan: {},
            subscriptions_by_status: {},
            trial_subscriptions: 0,
            ending_paid_subscriptions: [],
        });
        return true;
    }
    if (method === 'GET' && path.endsWith('/v1/admin/subscriptions')) {
        const page = listSlice(content.subscriptions, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/subscriptions\/([^/]+)$/);
        if (m) {
            const id = decodeURIComponent(m[1]);
            const idx = content.subscriptions.findIndex((s) => s.id === id);
            if (idx < 0) {
                await json(route, 404, { error: 'not_found' });
                return true;
            }
            if (method === 'GET') {
                await json(route, 200, content.subscriptions[idx]);
                return true;
            }
            if (method === 'PUT') {
                const patch = (postData() || {}) as Record<string, unknown>;
                delete patch.id;
                content.subscriptions[idx] = { ...content.subscriptions[idx], ...patch, id };
                await json(route, 200, content.subscriptions[idx]);
                return true;
            }
            if (method === 'DELETE') {
                content.subscriptions.splice(idx, 1);
                await json(route, 200, { ok: true });
                return true;
            }
        }
    }

    // ---- banned words ----
    if (method === 'GET' && path.endsWith('/v1/admin/banned-words')) {
        const page = listSlice(
            content.bannedWords.map((w) => ({ ...w, id: w.word })),
            url
        );
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    if (method === 'POST' && path.endsWith('/v1/admin/banned-words')) {
        const payload = postData() as { word?: string };
        const word = (payload.word || '').trim();
        if (word) content.bannedWords.push({ word, added_by: 'admin-e2e-1', added_at: '2026-07-14T12:00:00Z' });
        await json(route, 200, { ok: true });
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/banned-words\/([^/]+)$/);
        if (m && method === 'DELETE') {
            const word = decodeURIComponent(m[1]);
            content.bannedWords = content.bannedWords.filter((w) => w.word !== word);
            await json(route, 200, { ok: true });
            return true;
        }
    }

    // ---- admins ----
    if (method === 'GET' && path.endsWith('/v1/admin/admins')) {
        const page = listSlice(content.admins, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }
    if (method === 'POST' && path.endsWith('/v1/admin/admins')) {
        const payload = postData() as Record<string, unknown>;
        const created = {
            id: `admin-new-${content.admins.length + 1}`,
            email: String(payload.email || 'new@eventhub.local'),
            nickname: String(payload.nickname || 'New Admin'),
            role: String(payload.role || 'admin'),
            language: 'ru',
            phone: null,
            avatar_url: null,
            timezone: 'UTC',
            created_at: '2026-07-14T12:00:00Z',
            updated_at: '2026-07-14T12:00:00Z',
            last_login: null,
        };
        content.admins.push(created);
        await json(route, 200, created);
        return true;
    }
    {
        const m = path.match(/\/v1\/admin\/admins\/([^/]+)$/);
        if (m) {
            const id = decodeURIComponent(m[1]);
            const idx = content.admins.findIndex((a) => a.id === id);
            if (idx < 0) {
                await json(route, 404, { error: 'not_found' });
                return true;
            }
            if (method === 'GET') {
                await json(route, 200, content.admins[idx]);
                return true;
            }
            if (method === 'PUT') {
                content.admins[idx] = { ...content.admins[idx], ...(postData() as object) };
                await json(route, 200, content.admins[idx]);
                return true;
            }
            if (method === 'DELETE') {
                content.admins.splice(idx, 1);
                await json(route, 200, { ok: true });
                return true;
            }
        }
    }

    // ---- audit ----
    if (method === 'GET' && path.endsWith('/v1/admin/audit')) {
        const page = listSlice(content.audit, url);
        await json(route, 200, page.rows, { 'X-Total-Count': String(page.total) });
        return true;
    }

    // ---- monitoring ----
    if (method === 'GET' && path.includes('/v1/admin/nodes/metrics')) {
        await json(route, 200, [
            {
                active_sessions: 3,
                io_in: 10,
                io_out: 20,
                memory_atom: 1,
                memory_binary: 2,
                memory_ets: 3,
                memory_processes: 4,
                memory_total: 2048,
                mnesia_commits: 1,
                mnesia_failures: 0,
                node: 'node-a',
                process_count: 100,
                run_queue: 0,
                table_sizes: { users: 10 },
                timestamp: '2026-07-14T12:00:00Z',
                ws_connections: 5,
                cpu_utilization: 12,
                memory_available: 1024,
            },
        ]);
        return true;
    }

    return false;
}