| 1 | "use client"; |
| 2 | |
| 3 | import { useCompletion } from "@ai-sdk/react"; |
| 4 | import { |
| 5 | createContext, |
| 6 | useCallback, |
| 7 | useContext, |
| 8 | useRef, |
| 9 | useState, |
| 10 | type ReactNode, |
| 11 | } from "react"; |
| 12 | |
| 13 | import { type ImageModelList } from "@/constants/image-models"; |
| 14 | import { usePresentationState } from "@/states/presentation-state"; |
| 15 | import { SlideParser } from "../../utils/parser"; |
| 16 | |
| 17 | function stripXmlCodeBlock(input: string): string { |
| 18 | let result = input.trim(); |
| 19 | if (result.startsWith("```xml")) { |
| 20 | result = result.slice(6).trimStart(); |
| 21 | } |
| 22 | if (result.endsWith("```")) { |
| 23 | result = result.slice(0, -3).trimEnd(); |
| 24 | } |
| 25 | return result; |
| 26 | } |
| 27 | |
| 28 | interface SlideGenerationContextValue { |
| 29 | isGenerating: boolean; |
| 30 | generatingSlideId: string | null; |
| 31 | generateSlide: ( |
| 32 | slideId: string, |
| 33 | prompt: string, |
| 34 | options?: SlideGenerationOptions, |
| 35 | ) => void; |
| 36 | cancelGeneration: () => void; |
| 37 | } |
| 38 | |
| 39 | type SlideGenerationOptions = { |
| 40 | slideType?: "standard" | "image"; |
| 41 | imageStyle?: string; |
| 42 | textDensity?: string; |
| 43 | imageModel?: ImageModelList; |
| 44 | }; |
| 45 | |
| 46 | const SlideGenerationContext = |
| 47 | createContext<SlideGenerationContextValue | null>(null); |
| 48 | |
| 49 | export function SlideGenerationProvider({ children }: { children: ReactNode }) { |
| 50 | const [generatingSlideId, setGeneratingSlideId] = useState<string | null>( |
| 51 | null, |
| 52 | ); |
| 53 | |
| 54 | // Refs for parsing |
| 55 | const parserRef = useRef<SlideParser | null>(null); |
| 56 | if (!parserRef.current) { |
| 57 | parserRef.current = new SlideParser(); |
| 58 | } |
| 59 | const parser = parserRef.current; |
| 60 | const slideIdRef = useRef<string | null>(null); |
| 61 | const slideTypeRef = useRef<SlideGenerationOptions["slideType"]>("standard"); |
| 62 | const imageModelRef = useRef<SlideGenerationOptions["imageModel"]>(undefined); |
| 63 | |
| 64 | const language = usePresentationState((s) => s.language); |
| 65 | const setSlides = usePresentationState((s) => s.setSlides); |
| 66 | const startRootImageGeneration = usePresentationState( |
| 67 | (s) => s.startRootImageGeneration, |
| 68 | ); |
| 69 | |
| 70 | const { complete, isLoading, stop } = useCompletion({ |
| 71 | api: "/api/presentation/generate-slide", |
| 72 | onFinish: (_prompt, finalCompletion) => { |
| 73 | // Parse final content and update the slide only when fully complete |
| 74 | const processedCompletion = stripXmlCodeBlock(finalCompletion); |
| 75 | parser.reset(); |
| 76 | parser.parseChunk(processedCompletion); |
| 77 | parser.finalize(); |
| 78 | const parsedSlides = parser.getAllSlides(); |
| 79 | |
| 80 | if (parsedSlides.length > 0 && slideIdRef.current) { |
| 81 | const generatedSlide = parsedSlides[0]; |
| 82 | const targetSlideId = slideIdRef.current; |
| 83 | const isImageSlide = slideTypeRef.current === "image"; |
| 84 | |
| 85 | // Update the target slide with generated content |
| 86 | const currentSlides = usePresentationState.getState().slides; |
| 87 | const updatedSlides = currentSlides.map((slide) => { |
| 88 | if (slide.id === targetSlideId) { |
| 89 | return { |
| 90 | ...slide, |
| 91 | content: generatedSlide!.content, |
| 92 | layoutType: generatedSlide!.layoutType ?? slide.layoutType, |
| 93 | rootImage: generatedSlide!.rootImage ?? slide.rootImage, |
| 94 | isImageSlide, |
| 95 | }; |
| 96 | } |
| 97 | return slide; |
| 98 | }); |
| 99 | |
| 100 | setSlides(updatedSlides); |
| 101 | |
| 102 | if (generatedSlide?.rootImage?.query) { |
| 103 | startRootImageGeneration( |
| 104 | targetSlideId, |
| 105 | generatedSlide.rootImage.query, |
| 106 | { |
| 107 | imageModel: imageModelRef.current, |
| 108 | source: isImageSlide ? "ai" : undefined, |
| 109 | }, |
| 110 | ); |
| 111 | } |
| 112 | |
| 113 | } |
| 114 | |
| 115 | // Reset state |
| 116 | setGeneratingSlideId(null); |
| 117 | slideIdRef.current = null; |
| 118 | slideTypeRef.current = "standard"; |
| 119 | imageModelRef.current = undefined; |
| 120 | parser.reset(); |
| 121 | }, |
| 122 | onError: (error) => { |
| 123 | console.error("Failed to generate slide:", error); |
| 124 | setGeneratingSlideId(null); |
| 125 | slideIdRef.current = null; |
| 126 | parser.reset(); |
| 127 | }, |
| 128 | }); |
| 129 | |
| 130 | const generateSlide = useCallback( |
| 131 | (slideId: string, prompt: string, options?: SlideGenerationOptions) => { |
| 132 | if (isLoading) return; |
| 133 | |
| 134 | // Reset state |
| 135 | setGeneratingSlideId(slideId); |
| 136 | parser.reset(); |
| 137 | slideIdRef.current = slideId; |
| 138 | slideTypeRef.current = options?.slideType ?? "standard"; |
| 139 | imageModelRef.current = options?.imageModel; |
| 140 | |
| 141 | // Get current slide for context |
| 142 | const slides = usePresentationState.getState().slides; |
| 143 | const currentSlide = slides.find((s) => s.id === slideId); |
| 144 | |
| 145 | // Start generation |
| 146 | void complete(prompt, { |
| 147 | body: { |
| 148 | prompt, |
| 149 | language, |
| 150 | currentSlide: currentSlide |
| 151 | ? JSON.stringify(currentSlide.content) |
| 152 | : undefined, |
| 153 | slideType: options?.slideType, |
| 154 | imageStyle: options?.imageStyle, |
| 155 | textDensity: options?.textDensity, |
| 156 | imageModel: options?.imageModel, |
| 157 | }, |
| 158 | }); |
| 159 | }, |
| 160 | [isLoading, complete, language], |
| 161 | ); |
| 162 | |
| 163 | const cancelGeneration = useCallback(() => { |
| 164 | stop(); |
| 165 | setGeneratingSlideId(null); |
| 166 | slideIdRef.current = null; |
| 167 | slideTypeRef.current = "standard"; |
| 168 | imageModelRef.current = undefined; |
| 169 | parser.reset(); |
| 170 | }, [stop]); |
| 171 | |
| 172 | return ( |
| 173 | <SlideGenerationContext.Provider |
| 174 | value={{ |
| 175 | isGenerating: isLoading, |
| 176 | generatingSlideId, |
| 177 | generateSlide, |
| 178 | cancelGeneration, |
| 179 | }} |
| 180 | > |
| 181 | {children} |
| 182 | </SlideGenerationContext.Provider> |
| 183 | ); |
| 184 | } |
| 185 | |
| 186 | export function useSlideGeneration(): SlideGenerationContextValue { |
| 187 | const context = useContext(SlideGenerationContext); |
| 188 | if (!context) { |
| 189 | throw new Error( |
| 190 | "useSlideGeneration must be used within a SlideGenerationProvider", |
| 191 | ); |
| 192 | } |
| 193 | return context; |
| 194 | } |
| 195 |