import {z} from 'zod'

export type GetApiMigrationsMigrationIdLogArgs = {format?: ('json' | 'md' | 'markdown') | undefined};

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

export const migrationStatus = z.enum(["awaiting_files", "ready", "awaiting_approval", "completed"]);

export const sessionLogRun = z.object({run_id: z.string().optional(), kind: z.string().optional(), status: z.string().optional(), started_at: z.string().nullable().optional(), completed_at: z.string().nullable().optional(), started_by: z.string().nullable().optional(), files: z.array(z.string()).optional(), plan: z.string().nullable().optional(), questions: z.array(z.object({})).optional(), answers: z.object({}).optional(), outcome: z.object({ok: z.boolean().nullable().optional(), rows_written: z.number().int().nullable().optional(), per_sheet: z.array(z.object({sheet: z.string().nullable().optional(), rows: z.number().int().nullable().optional()})).optional(), invalid_rows: z.number().int().nullable().optional(), error: z.string().nullable().optional(), replaced_existing_data: z.boolean().optional()}).nullable().optional(), audit: z.array(z.object({at: z.string().optional(), event: z.enum(["started", "resumed", "templates_adjusted", "plan_approved", "unknown"]).optional(), actor: z.string().nullable().optional(), mode: z.string().optional(), answers_excerpt: z.string().optional(), changes: z.array(z.object({})).optional(), plan: z.string().optional()})).optional()});

export const sessionLog = z.object({migration_id: z.string().optional(), generated_at: z.string().optional(), status: migrationStatus.optional(), covers: z.object({runs: z.number().int().optional(), from: z.string().nullable().optional(), to: z.string().nullable().optional()}).optional(), runs: z.array(sessionLogRun).optional()});

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
};

/**
 * Get the session log
 * 
 * GET /migrations/{migration_id}/log
 */
export const getApiMigrationsMigrationIdLog = async (args: GetApiMigrationsMigrationIdLogArgs, options?: GetApiMigrationsMigrationIdLogOptions) => {
const {baseUrl = "https://app.vern.so/api/v1", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.format != null) query.append("format", String(args.format))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

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

const res = await fetchFn(url, {method: "GET", headers})

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

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