// ─── Video Engine V1 — API client ────────────────────────────────────────────
// Talks to the backend curriculum-aligned script endpoints. No file paths ever
// cross this boundary; segment ids are opaque hashes.

import { apiGet, apiPost } from "@/lib/api/client";
import type { VideoScript } from "@/lib/video/types";

export type CurriculumHints = {
  chapter_name?: string;
  topics?: string[];
  formulas?: string[];
  definitions?: string[];
  common_mistakes?: string[];
  exam_importance?: string | null;
  pyq_frequency?: string | null;
  exam_weightage_marks?: number | null;
  prerequisites?: string[];
};

export type VideoScriptRequest = {
  chapter_slug: string;
  subject?: string;
  level?: string;
  mode?: string;
  duration_minutes?: number;
  language_preference?: string | null;
  curriculum_hints?: CurriculumHints;
  student_progress?: Record<string, unknown> | null;
};

export type SegmentAudioResponse = {
  segment_id: string;
  mode: string;
  audio_ready: boolean;
  audio_token: string | null;
  subtitle_text: string;
  message: string;
};

export type VideoProgressResponse = {
  video_id: string;
  current_segment_index: number;
  completed_segment_ids: string[];
  percent_complete: number;
  updated_at: string | null;
};

export function generateVideoScript(payload: VideoScriptRequest) {
  return apiPost<VideoScript, VideoScriptRequest>("/video/generate-script", payload);
}

export function generateSegmentAudio(
  segmentId: string,
  body: { teacher_script: string; language?: string; voice?: string | null },
) {
  return apiPost<SegmentAudioResponse, typeof body>(
    `/video/segment/${encodeURIComponent(segmentId)}/generate`,
    body,
  );
}

export function getVideoProgress(videoId: string) {
  return apiGet<VideoProgressResponse>(`/video/${encodeURIComponent(videoId)}/progress`);
}