// web/src/api.ts
const BASE = import.meta.env.VITE_API_BASE ?? ""

export interface Document {
    id: string
    title: string
    file_path: string
    status: "pending" | "processing" | "ready" | "error"
    task_id: string | null
    page_count: number | null
    created_at: string
}

export interface SearchResult {
    chunk_id: string
    doc_id: string
    page_number: number
    text_snippet: string
    bm25_score: number
}

export interface Citation {
    doc_id: string
    page_number: number
    snippet: string
    bm25_score: number | null
}

export interface ChatResponse {
    answer: string
    citations: Citation[]
}

export interface TaskStatus {
    status: string
    progress?: number
    error?: string
}

export interface DocumentStatus {
    id: string
    status: "pending" | "processing" | "ready" | "error"
    task_id: string | null
    page_count: number | null
    vec_count: number
    error_msg: string | null
}

export interface ChatMessage {
    role: string
    content: string
}

export const api = {
    async getLibrary(): Promise<Document[]> {
        const r = await fetch(`${BASE}/api/library`)
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async scanLibrary(): Promise<{ discovered: number; queued: number; tasks: { doc_id: string; task_id: string }[] }> {
        const r = await fetch(`${BASE}/api/library/scan`, { method: "POST" })
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async reshelveDocument(docId: string): Promise<{ task_id: string }> {
        const r = await fetch(`${BASE}/api/library/${docId}/reshelve`, { method: "POST" })
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async deleteDocument(docId: string): Promise<void> {
        const r = await fetch(`${BASE}/api/library/${docId}`, { method: "DELETE" })
        if (!r.ok) throw new Error(await r.text())
    },
    async uploadDocument(file: File): Promise<{ doc_id: string; task_id: string | null; filename: string; status: string }> {
        const form = new FormData()
        form.append("file", file)
        const r = await fetch(`${BASE}/api/library/upload`, { method: "POST", body: form })
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async getTaskStatus(taskId: string): Promise<TaskStatus> {
        const r = await fetch(`${BASE}/api/shelve/${taskId}`)
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async getDocumentStatus(docId: string): Promise<DocumentStatus> {
        const r = await fetch(`${BASE}/api/library/${docId}/status`)
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async search(query: string, topK = 10, docIds?: string[]): Promise<SearchResult[]> {
        const r = await fetch(`${BASE}/api/search`, {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ query, top_k: topK, doc_ids: docIds ?? null }),
        })
        if (!r.ok) throw new Error(await r.text())
        return r.json()
    },
    async chat(
        message: string,
        history: ChatMessage[],
        docIds?: string[],
        topK = 5,
    ): Promise<ChatResponse> {
        const r = await fetch(`${BASE}/api/chat`, {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ message, history, doc_ids: docIds ?? null, top_k: topK }),
        })
        if (!r.ok) {
            const body = await r.json().catch(() => ({}))
            const err: Error & { status?: number; detail?: unknown } = new Error(
                (body as { detail?: { message?: string } }).detail?.message ?? "Request failed"
            )
            err.status = r.status
            err.detail = (body as { detail?: unknown }).detail
            throw err
        }
        return r.json()
    },
    async chatFeedbackStatus(): Promise<{ enabled: boolean }> {
        const r = await fetch(`${BASE}/api/chat/feedback/status`)
        if (!r.ok) return { enabled: false }
        return r.json()
    },
    async submitChatFeedback(
        rating: 1 | -1,
        question: string,
        answer: string,
        docIds: string[],
    ): Promise<void> {
        await fetch(`${BASE}/api/chat/feedback`, {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ rating, question, answer, doc_ids: docIds }),
        })
    },
}