// Admin-only API client. Every endpoint here is guarded by
// RequireAdmin on the backend (session cookie only — bearer tokens
// won't reach these routes). 403s thrown here propagate up to the
// /admin layout, which renders the framework error page.

import { request, type Page } from './client';
import type { User } from './auth';
import type { MangaDetail } from './mangas';
import type { Chapter } from './chapters';

// ---- users -----------------------------------------------------------------

export type AdminUsersPage = {
    items: User[];
    page: Page;
};

export type ListAdminUsersOptions = {
    search?: string;
    limit?: number;
    offset?: number;
};

export async function listAdminUsers(
    opts: ListAdminUsersOptions = {}
): Promise<AdminUsersPage> {
    const params = new URLSearchParams();
    if (opts.search) params.set('search', opts.search);
    if (opts.limit != null) params.set('limit', String(opts.limit));
    if (opts.offset != null) params.set('offset', String(opts.offset));
    const qs = params.toString();
    return request<AdminUsersPage>(`/v1/admin/users${qs ? `?${qs}` : ''}`);
}

export async function deleteAdminUser(id: string): Promise<void> {
    await request<void>(`/v1/admin/users/${encodeURIComponent(id)}`, {
        method: 'DELETE'
    });
}

export async function setUserAdmin(id: string, isAdmin: boolean): Promise<User> {
    return request<User>(`/v1/admin/users/${encodeURIComponent(id)}`, {
        method: 'PATCH',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ is_admin: isAdmin })
    });
}

export type CreateAdminUserInput = {
    username: string;
    password: string;
    is_admin?: boolean;
};

/** POST /v1/admin/users — admin-initiated account creation. Works
 *  regardless of the ALLOW_SELF_REGISTER toggle, since the entire
 *  point is for an admin to enroll someone when self-register is off. */
export async function createAdminUser(input: CreateAdminUserInput): Promise<User> {
    return request<User>('/v1/admin/users', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify(input)
    });
}

// ---- mangas / chapters with sync state -------------------------------------

export type MangaSyncState = 'in_progress' | 'dropped' | 'synced';

export type AdminMangaRow = {
    id: string;
    title: string;
    status: string;
    cover_image_path: string | null;
    created_at: string;
    updated_at: string;
    sync_state: MangaSyncState;
    chapter_count: number;
    latest_seen_at: string | null;
};

export type AdminMangasPage = {
    items: AdminMangaRow[];
    page: Page;
};

export type ListAdminMangasOptions = {
    search?: string;
    syncState?: MangaSyncState;
    limit?: number;
    offset?: number;
};

export async function listAdminMangas(
    opts: ListAdminMangasOptions = {}
): Promise<AdminMangasPage> {
    const params = new URLSearchParams();
    if (opts.search) params.set('search', opts.search);
    if (opts.syncState) params.set('sync_state', opts.syncState);
    if (opts.limit != null) params.set('limit', String(opts.limit));
    if (opts.offset != null) params.set('offset', String(opts.offset));
    const qs = params.toString();
    return request<AdminMangasPage>(`/v1/admin/mangas${qs ? `?${qs}` : ''}`);
}

export type ChapterSyncState =
    | 'downloading'
    | 'dropped'
    | 'failed'
    | 'not_downloaded'
    | 'synced';

export type AdminChapterRow = {
    id: string;
    manga_id: string;
    number: number;
    title: string | null;
    page_count: number;
    created_at: string;
    sync_state: ChapterSyncState;
    latest_seen_at: string | null;
};

export type AdminChaptersPage = {
    items: AdminChapterRow[];
    page: Page;
};

export type ListAdminChaptersOptions = {
    limit?: number;
    offset?: number;
};

export async function listAdminChapters(
    mangaId: string,
    opts: ListAdminChaptersOptions = {}
): Promise<AdminChaptersPage> {
    const params = new URLSearchParams();
    if (opts.limit != null) params.set('limit', String(opts.limit));
    if (opts.offset != null) params.set('offset', String(opts.offset));
    const qs = params.toString();
    return request<AdminChaptersPage>(
        `/v1/admin/mangas/${encodeURIComponent(mangaId)}/chapters${qs ? `?${qs}` : ''}`
    );
}

// ---- system ----------------------------------------------------------------

export type DiskStats = {
    total_bytes: number;
    used_bytes: number;
    free_bytes: number;
    percent_used: number;
};

export type MemoryStats = {
    total_bytes: number;
    used_bytes: number;
    percent_used: number;
};

export type CpuStats = {
    percent_used: number;
};

export type Alert = {
    level: 'warning';
    message: string;
};

export type SystemStats = {
    disk: DiskStats | null;
    memory: MemoryStats;
    cpu: CpuStats;
    alerts: Alert[];
};

export async function getSystemStats(): Promise<SystemStats> {
    return request<SystemStats>('/v1/admin/system');
}

// ---- force resync ----------------------------------------------------------

export type MangaResyncResponse = {
    manga: MangaDetail;
    metadata_status: 'new' | 'updated' | 'unchanged';
    cover_fetched: boolean;
};

export type ChapterResyncResponse = {
    chapter: Chapter;
    outcome: 'fetched' | 'skipped';
    /** Page count when `outcome === 'fetched'`; null when skipped. */
    pages: number | null;
};

/** POST /v1/admin/mangas/:id/resync — refetches metadata + cover from
 *  the manga's live crawler source. Long-running (one HTTP request per
 *  Chromium nav + image download), so the UI should disable the trigger
 *  and surface progress. */
export async function resyncManga(id: string): Promise<MangaResyncResponse> {
    return request<MangaResyncResponse>(
        `/v1/admin/mangas/${encodeURIComponent(id)}/resync`,
        { method: 'POST' }
    );
}

/** POST /v1/admin/chapters/:id/resync — force-refetches a chapter's
 *  pages even if `page_count > 0`. Same long-running caveat as
 *  `resyncManga`. */
export async function resyncChapter(id: string): Promise<ChapterResyncResponse> {
    return request<ChapterResyncResponse>(
        `/v1/admin/chapters/${encodeURIComponent(id)}/resync`,
        { method: 'POST' }
    );
}

// ---- crawler observability + control ---------------------------------------

/** Current daemon activity. Discriminated on `state`. */
export type CrawlerPhase =
    | { state: 'idle'; next_fire: string | null }
    | { state: 'walking_list' }
    | { state: 'fetching_metadata'; index: number; total: number | null; title: string }
    | { state: 'cover_backfill' };

export type CrawlerWorker = { state: 'idle' } | { state: 'working'; chapter_id: string };

export type CrawlerLastPass = {
    at: string | null;
    discovered: number;
    upserted: number;
    covers_fetched: number;
    mangas_failed: number;
};

export type CrawlerStatus = {
    daemon: 'running' | 'disabled';
    phase: CrawlerPhase | null;
    workers: CrawlerWorker[];
    last_pass: CrawlerLastPass;
    session: { expired: boolean; configured: boolean };
    browser: 'healthy' | 'draining' | 'restarting' | 'down';
    queue: { pending: number; running: number; dead: number };
};

export async function getCrawlerStatus(): Promise<CrawlerStatus> {
    return request<CrawlerStatus>('/v1/admin/crawler');
}

/** POST /v1/admin/crawler/run — trigger an out-of-cycle metadata pass. */
export async function runCrawlerPass(): Promise<{ started: boolean }> {
    return request('/v1/admin/crawler/run', { method: 'POST' });
}

/** POST /v1/admin/crawler/browser/restart — coordinated Chromium restart. */
export async function restartCrawlerBrowser(): Promise<{ ok: boolean; error: string | null }> {
    return request('/v1/admin/crawler/browser/restart', { method: 'POST' });
}

/** POST /v1/admin/crawler/session — refresh PHPSESSID and re-probe. */
export async function updateCrawlerSession(
    phpsessid: string
): Promise<{ valid: boolean; error: string | null }> {
    return request('/v1/admin/crawler/session', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ phpsessid })
    });
}

/** POST /v1/admin/crawler/session/clear-expired — resume idled workers. */
export async function clearCrawlerSessionExpired(): Promise<{ cleared: boolean }> {
    return request('/v1/admin/crawler/session/clear-expired', { method: 'POST' });
}

export type DeadJob = {
    id: string;
    kind: string;
    chapter_id: string | null;
    manga_id: string | null;
    manga_title: string | null;
    chapter_number: number | null;
    attempts: number;
    max_attempts: number;
    last_error: string | null;
    updated_at: string;
};

export type DeadJobsPage = { items: DeadJob[]; page: Page };

export async function listDeadJobs(opts?: {
    search?: string;
    limit?: number;
    offset?: number;
}): Promise<DeadJobsPage> {
    const params = new URLSearchParams();
    if (opts?.search) params.set('search', opts.search);
    if (opts?.limit != null) params.set('limit', String(opts.limit));
    if (opts?.offset != null) params.set('offset', String(opts.offset));
    const qs = params.toString();
    return request<DeadJobsPage>(`/v1/admin/crawler/dead-jobs${qs ? `?${qs}` : ''}`);
}

/** Requeue scope: all dead jobs, one manga's, one chapter's, or a single job. */
export type RequeueScope =
    | { scope: 'all' }
    | { scope: 'manga'; manga_id: string }
    | { scope: 'chapter'; chapter_id: string }
    | { scope: 'job'; job_id: string };

export async function requeueDeadJobs(scope: RequeueScope): Promise<{ requeued: number }> {
    return request('/v1/admin/crawler/dead-jobs/requeue', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify(scope)
    });
}