import {z} from 'zod'

export type SynthesisRequest = {query: string, max_facts?: number | undefined, include_epistemic_briefing?: boolean | undefined};

export type CreateApiPotsPotIdSynthesizeArgs = {pot_id: string, body: SynthesisRequest};

export type CreateApiPotsPotIdSynthesizeOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const restatedByRef = z.object({fact_id: z.string(), document_id: z.string().nullable().optional(), source_type: z.string().nullable().optional(), document_date: z.string().nullable().optional(), locator: z.string().nullable().optional(), partial: z.boolean().optional()});

export const potScoreLevel = z.enum(["CONSTITUTION", "VERIFIED", "SUPPORTED", "INFERRED", "HYPOTHESIS", "SPECULATION"]);

export const factProvenance = z.object({type: z.string(), sources: z.array(z.record(z.string(), z.unknown())).optional(), profile_id: z.string().nullable().optional(), profile_version: z.number().int().nullable().optional()});

export const synthesisFactItem = z.object({restated_by: z.array(restatedByRef).optional(), restates: z.string().nullable().optional(), restates_all: z.array(z.string()).optional(), fact_id: z.string(), content: z.string(), title: z.string().nullable().optional(), pot_score: z.number().gte(0).lte(1), original_pot_score: z.number().nullable().optional(), level: potScoreLevel, source: z.string(), document_id: z.string().nullable().optional(), provenance: factProvenance.nullable().optional(), superseded: z.boolean().optional(), superseded_by: z.array(z.string()).optional()});

export const certaintySummary = z.object({total_facts: z.number().int(), constitution: z.number().int().optional(), verified: z.number().int().optional(), extracted: z.number().int().optional(), inferred: z.number().int().optional(), pending: z.number().int().optional(), average_score: z.number().optional()});

export const epistemicBriefingResponse = z.object({certainty_summary: certaintySummary, high_confidence_facts: z.array(z.string()).optional(), hedged_facts: z.array(z.string()).optional(), contradictions: z.array(z.string()).optional(), knowledge_gaps: z.array(z.string()).optional(), provenance_notes: z.array(z.string()).optional()});

export const contradictionItem = z.object({fact_id_a: z.string(), fact_id_b: z.string(), content_a: z.string(), content_b: z.string(), weight: z.number().gte(0).lte(1), rationale: z.string().optional()});

export const gapSignal = z.object({version: z.string(), confidence: z.number().gte(0).lte(1), is_knowledge_gap: z.boolean(), threshold: z.number().gte(0).lte(1), total_facts: z.number().int().gte(0), high_certainty_facts: z.number().int().gte(0), average_score: z.number().gte(0).lte(1), reasons: z.array(z.string()).optional(), judge: z.string().nullable().optional()});

export const synthesisResponse = z.object({answer: z.string(), facts_used: z.array(synthesisFactItem), strategy_used: z.string(), total_facts_retrieved: z.number().int().gte(0), llm_model: z.string(), llm_cost_usd: z.number().gte(0), latency_ms: z.number().gte(0), epistemic_briefing: epistemicBriefingResponse.nullable().optional(), contradictions_found: z.array(contradictionItem).optional(), is_knowledge_gap: z.boolean(), gap_signal: gapSignal});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Answer a question with receipts (facts + scores + provenance)
 * 
 * POST /pots/{pot_id}/synthesize
 */
export const createApiPotsPotIdSynthesize = async (args: CreateApiPotsPotIdSynthesizeArgs, options: CreateApiPotsPotIdSynthesizeOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

const url = `${baseUrl.replace(/\/+$/, '')}/pots/${encodeURIComponent(String(args.pot_id))}/synthesize${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(synthesisResponse, await res.json())
};