import { apiRequest } from './services/session'
import type { VectorRetrievalResult } from './services/vectors'
import type { ChunkKeywordResult, HybridResult } from './services/hybrid'

export const getHealth = () => apiRequest<{status:string}>('/api/health')
export const askQuestion = (question:string) => apiRequest<{answer:string;status:'retrieval_only'|'no_evidence';sources:{title:string;source_url?:string|null}[];retrieval_run_id:string}>('/api/chat',{method:'POST',body:JSON.stringify({question})})
export const getKnowledge = () => apiRequest<{id:number;title:string;category:string;content:string;source_url:string|null;verification_status:string;version:number}[]>('/api/knowledge')
export const createKnowledge = (payload:{title:string;category:string;content:string;source_url?:string;collected_at?:string}) => apiRequest('/api/knowledge',{method:'POST',body:JSON.stringify(payload)},true)

export type VerificationStatus='pending'|'verified'|'rejected'
export type KnowledgeItem={id:number;version:number;title:string;category:string;content:string;source_url:string|null;source_id:number|null;document_id:number|null;collected_at:string|null;verification_status:VerificationStatus;reviewer:string|null;reviewed_at:string|null;verification_notes:string|null;created_at:string;updated_at:string;is_deleted:boolean}
export function getKnowledgePage(filters:{q?:string;category?:string;verification_status?:VerificationStatus;page?:number;page_size?:number}={}){const params=new URLSearchParams();for(const [key,value] of Object.entries(filters)){if(value!==undefined&&value!=='')params.set(key,String(value))}return apiRequest<{items:KnowledgeItem[];total:number;page:number;page_size:number}>(`/api/knowledge/page?${params}`)}
export function updateKnowledge(id:number,payload:{expected_version:number;title?:string;category?:string;content?:string;source_id?:number|null;source_url?:string|null;collected_at?:string|null}){return apiRequest<KnowledgeItem>(`/api/knowledge/${id}`,{method:'PATCH',body:JSON.stringify(payload)},true)}
export function deleteKnowledge(id:number,expectedVersion:number){return apiRequest<void>(`/api/knowledge/${id}?expected_version=${expectedVersion}`,{method:'DELETE'},true)}
export function getKnowledgeHistory(id:number,page=1,pageSize=20){return apiRequest<{items:AuditItem[];total:number;page:number;page_size:number}>(`/api/knowledge/${id}/history?page=${page}&page_size=${pageSize}`)}
export type SourceItem={id:number;version:number;name:string;source_url:string|null;notes:string;created_at:string}
export function getSources(q='',page=1,pageSize=20){return apiRequest<{items:SourceItem[];total:number;page:number;page_size:number}>(`/api/sources?q=${encodeURIComponent(q)}&page=${page}&page_size=${pageSize}`)}
export function createSource(payload:{name:string;source_url?:string;notes:string}){return apiRequest<SourceItem>('/api/sources',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)},true)}
export function updateSource(id:number,payload:{expected_version:number;name?:string;source_url?:string|null;notes?:string}){return apiRequest<SourceItem>(`/api/sources/${id}`,{method:'PATCH',body:JSON.stringify(payload)},true)}
export function deleteSource(id:number,expectedVersion:number){return apiRequest<void>(`/api/sources/${id}?expected_version=${expectedVersion}`,{method:'DELETE'},true)}
export function getSourceHistory(id:number,page=1,pageSize=20){return apiRequest<{items:AuditItem[];total:number;page:number;page_size:number}>(`/api/sources/${id}/history?page=${page}&page_size=${pageSize}`)}
export function reviewKnowledge(id:number,payload:{expected_version:number;verification_status:VerificationStatus;reviewer:string;verification_notes:string}){return apiRequest(`/api/knowledge/${id}/review`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)},true)}
export type DocumentItem={id:number;version:number;source_id:number;title:string;category:string;content:string;collected_at:string;notes:string;created_at:string;updated_at:string;is_deleted:boolean}
export function getDocuments(q='',page=1,pageSize=20){return apiRequest<{items:DocumentItem[];total:number;page:number;page_size:number}>(`/api/documents?q=${encodeURIComponent(q)}&page=${page}&page_size=${pageSize}`)}
export function createDocument(payload:{source_id:number;title:string;category:string;content:string;collected_at:string;notes?:string}){return apiRequest<DocumentItem>('/api/documents',{method:'POST',body:JSON.stringify(payload)},true)}
export function updateDocument(id:number,payload:{expected_version:number;title?:string;category?:string;content?:string;collected_at?:string;notes?:string}){return apiRequest<DocumentItem>(`/api/documents/${id}`,{method:'PATCH',body:JSON.stringify(payload)},true)}
export function deleteDocument(id:number,expectedVersion:number){return apiRequest<void>(`/api/documents/${id}?expected_version=${expectedVersion}`,{method:'DELETE'},true)}
export type AuditItem={id:number;entity_type:string;entity_id:number;action:string;actor:string|null;notes:string;snapshot:Record<string,unknown>;created_at:string}
export function getDocumentHistory(id:number,page=1,pageSize=20){return apiRequest<{items:AuditItem[];total:number;page:number;page_size:number}>(`/api/documents/${id}/history?page=${page}&page_size=${pageSize}`)}

export type RetrievalHit={rank:number;knowledge_id:number;knowledge_version:number;document_id:number|null;document_version:number|null;source_id:number|null;source_version:number|null;source_name:string|null;source_url:string;title:string;category:string;snippet:string;snippet_start:number;snippet_end:number;score:number;matched_terms:string[]}
export type RetrievalResult={run_id:string;query:string;mode:'keyword';status:'ok'|'no_evidence';top_k:number;category:string|null;query_terms:string[];corpus_size:number;corpus_fingerprint:string;total_hits:number;results:RetrievalHit[];elapsed_ms:number;created_at:string;config:{tokenizer:string;scorer:string;k1:number;b:number;title_weight:number;stopwords_version:string}}
export function retrieveKnowledge(payload:{query:string;mode?:'keyword';top_k?:number;category?:string}){return apiRequest<RetrievalResult>('/api/retrieval',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)})}
export type RetrievalRunResult = RetrievalResult | VectorRetrievalResult | ChunkKeywordResult | HybridResult
export function getRetrievalRun(runId:string){return apiRequest<RetrievalRunResult>(`/api/retrieval/runs/${encodeURIComponent(runId)}`)}
export function getRetrievalRuns(page=1,pageSize=20){return apiRequest<{items:RetrievalRunResult[];total:number;page:number;page_size:number}>(`/api/retrieval/runs?page=${page}&page_size=${pageSize}`)}