/**
 * Editor API client for connecting to FastAPI backend
 */

const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8000/api'

export interface StoryboardFrame {
    id: string
    index: number
    order: number
    narration: string
    image_prompt?: string
    image_path?: string
    audio_path?: string
    video_segment_path?: string
    duration: number
}

export interface Storyboard {
    id: string
    title: string
    frames: StoryboardFrame[]
    total_duration: number
    final_video_path?: string
    created_at?: string
}

export interface PreviewResponse {
    preview_path: string
    duration: number
    frames_count: number
}

export interface InpaintResponse {
    image_path: string
    success: boolean
}

class EditorApiClient {
    private baseUrl: string

    constructor(baseUrl: string = API_BASE) {
        this.baseUrl = baseUrl
    }

    /**
     * Fetch storyboard by ID
     */
    async getStoryboard(storyboardId: string): Promise<Storyboard> {
        const response = await fetch(`${this.baseUrl}/editor/storyboard/${storyboardId}`)

        if (!response.ok) {
            throw new Error(`Failed to fetch storyboard: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Reorder frames in storyboard
     */
    async reorderFrames(storyboardId: string, order: string[]): Promise<Storyboard> {
        const response = await fetch(`${this.baseUrl}/editor/storyboard/${storyboardId}/reorder`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ order }),
        })

        if (!response.ok) {
            throw new Error(`Failed to reorder frames: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Update frame duration
     */
    async updateFrameDuration(
        storyboardId: string,
        frameId: string,
        duration: number
    ): Promise<StoryboardFrame> {
        const response = await fetch(
            `${this.baseUrl}/editor/storyboard/${storyboardId}/frames/${frameId}/duration`,
            {
                method: 'PATCH',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ duration }),
            }
        )

        if (!response.ok) {
            throw new Error(`Failed to update duration: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Generate preview video
     */
    async generatePreview(
        storyboardId: string,
        startFrame?: number,
        endFrame?: number
    ): Promise<PreviewResponse> {
        const response = await fetch(`${this.baseUrl}/editor/storyboard/${storyboardId}/preview`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                start_frame: startFrame ?? 0,
                end_frame: endFrame,
            }),
        })

        if (!response.ok) {
            throw new Error(`Failed to generate preview: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Update frame content (narration and/or image prompt)
     */
    async updateFrame(
        storyboardId: string,
        frameId: string,
        data: { narration?: string; image_prompt?: string }
    ): Promise<{ id: string; narration: string; image_prompt?: string; updated: boolean }> {
        const response = await fetch(
            `${this.baseUrl}/editor/storyboard/${storyboardId}/frames/${frameId}`,
            {
                method: 'PUT',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data),
            }
        )

        if (!response.ok) {
            const error = await response.json().catch(() => ({ detail: response.statusText }))
            throw new Error(error.detail || `Failed to update frame: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Regenerate image for a frame
     */
    async regenerateImage(
        storyboardId: string,
        frameId: string,
        imagePrompt?: string
    ): Promise<{ image_path: string; success: boolean }> {
        const response = await fetch(
            `${this.baseUrl}/editor/storyboard/${storyboardId}/frames/${frameId}/regenerate-image`,
            {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ image_prompt: imagePrompt }),
            }
        )

        if (!response.ok) {
            const error = await response.json().catch(() => ({ detail: response.statusText }))
            throw new Error(error.detail || `Failed to regenerate image: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Regenerate audio for a frame
     */
    async regenerateAudio(
        storyboardId: string,
        frameId: string,
        narration?: string,
        voice?: string
    ): Promise<{ audio_path: string; duration: number; success: boolean }> {
        const response = await fetch(
            `${this.baseUrl}/editor/storyboard/${storyboardId}/frames/${frameId}/regenerate-audio`,
            {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ narration, voice }),
            }
        )

        if (!response.ok) {
            const error = await response.json().catch(() => ({ detail: response.statusText }))
            throw new Error(error.detail || `Failed to regenerate audio: ${response.statusText}`)
        }

        return response.json()
    }

    /**
     * Inpaint (局部重绘) image for a frame
     */
    async inpaintImage(
        storyboardId: string,
        frameId: string,
        mask: string,
        prompt?: string,
        denoiseStrength?: number
    ): Promise<InpaintResponse> {
        const response = await fetch(
            `${this.baseUrl}/editor/storyboard/${storyboardId}/frames/${frameId}/inpaint`,
            {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    mask,
                    prompt,
                    denoise_strength: denoiseStrength ?? 0.8,
                }),
            }
        )

        if (!response.ok) {
            const error = await response.json().catch(() => ({ detail: response.statusText }))
            throw new Error(error.detail || `Failed to inpaint image: ${response.statusText}`)
        }

        return response.json()
    }
}

// Export singleton instance
export const editorApi = new EditorApiClient()