94 lines
3.3 KiB
TypeScript
94 lines
3.3 KiB
TypeScript
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import type { EpisodeConfig, StructuredScript } from "../types";
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const FORMAT_GUIDANCE: Record<EpisodeConfig["format"], string> = {
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SOLO: "A single host speaking directly to the listener. Use only the host speaker.",
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INTERVIEW:
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"A host interviewing a guest. Alternate naturally between host questions and guest answers.",
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MULTI_HOST:
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"A panel of co-hosts in lively conversation. Distribute lines across all speakers and let them react to each other.",
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};
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/** Roughly 150 spoken words per minute → target word budget for the whole episode. */
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function wordBudget(minutes: number): number {
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return Math.round(minutes * 150);
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}
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export function buildScriptMessages(config: EpisodeConfig) {
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const speakerList = config.speakers
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.map((s) => `- key "${s.speakerKey}" = ${s.displayName}`)
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.join("\n");
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const system = [
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"You are an expert podcast scriptwriter and showrunner.",
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"You write natural, engaging, spoken-word scripts that sound great when read aloud by AI voices.",
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"Avoid stage directions, sound-effect notes, and parentheticals — output only spoken dialogue.",
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"Return STRICT JSON only, matching the requested schema. Do not include markdown fences.",
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].join(" ");
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const user = [
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`Write a complete podcast episode script in ${config.language}.`,
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"",
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`Topic: ${config.topic}`,
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`Tone: ${config.tone}`,
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`Format: ${config.format} — ${FORMAT_GUIDANCE[config.format]}`,
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config.audience ? `Target audience: ${config.audience}` : "",
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`Approximate length: ${config.targetLengthMin} minutes (~${wordBudget(
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config.targetLengthMin
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)} words total).`,
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"",
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"Speakers (use ONLY these keys in `speakerKey`):",
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speakerList,
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"",
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"Structure the episode into 3–6 sections (e.g. intro, main segments, outro).",
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"Each section has a short title and a list of turns. Each turn is one speaker's spoken line.",
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"",
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"Return JSON with this exact shape:",
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`{
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"title": "string — a catchy episode title",
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"sections": [
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{
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"id": "kebab-case-id",
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"title": "string",
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"turns": [
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{ "speakerKey": "host", "text": "spoken line..." }
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]
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}
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]
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}`,
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]
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.filter(Boolean)
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.join("\n");
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return [
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{ role: "system" as const, content: system },
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{ role: "user" as const, content: user },
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];
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}
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export function buildSectionMessages(
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config: EpisodeConfig,
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script: StructuredScript,
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sectionId: string
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) {
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const section = script.sections.find((s) => s.id === sectionId);
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const speakerList = config.speakers.map((s) => `"${s.speakerKey}"=${s.displayName}`).join(", ");
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const system =
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"You are an expert podcast scriptwriter. Rewrite a single section of an existing episode, keeping the same speakers, tone, and language. Return STRICT JSON for just that one section.";
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const user = [
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`Episode title: ${script.title}`,
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`Tone: ${config.tone}. Language: ${config.language}. Speakers: ${speakerList}.`,
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"",
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`Rewrite the section titled "${section?.title ?? sectionId}" (id "${sectionId}") to be fresh and engaging while serving the same purpose in the episode.`,
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"",
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"Return JSON with this exact shape:",
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`{ "id": "${sectionId}", "title": "string", "turns": [ { "speakerKey": "host", "text": "..." } ] }`,
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].join("\n");
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return [
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{ role: "system" as const, content: system },
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{ role: "user" as const, content: user },
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];
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}
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