import * as fs from "node:fs";
import * as path from "node:path";
import { findPromptInjection, type PromptInjectionFinding } from "../core/prompt-injection-safety.js";
import { emitChannelEvent } from "./channel.js";

export type ForgejoIntakeKind = "issue" | "pull" | "wiki";
export type ForgejoRoute = "security" | "seo" | "sales-marketing" | "client-report" | "user-feedback" | "data-pipeline" | "devops" | "dev" | "wiki" | "triage" | "human-review";

export interface ForgejoIntakeSource {
  type: `forgejo_${ForgejoIntakeKind}`;
  url?: string;
  repo: string;
  id: string;
}

export interface ForgejoItem {
  source: ForgejoIntakeSource;
  title: string;
  body: string;
  labels: string[];
}

export interface ForgejoIntakeReceipt {
  source: ForgejoIntakeSource;
  task: {
    title: string;
    body: string;
    labels: string[];
    route: ForgejoRoute;
    priority: "normal" | "high";
  };
  receipts: {
    created_at: string;
    fetched_by: "fable-agent";
    unicode_scan: "passed" | "failed";
    injection_scan: "passed" | "failed";
    deploy_attempted: false;
    quarantine: boolean;
    findings: PromptInjectionFinding[];
  };
}

type ForgejoFetch = (input: string, init?: { headers?: Record<string, string> }) => Promise<{ ok: boolean; status: number; json(): Promise<unknown> }>;

export interface ForgejoIntakeOptions {
  ref: string;
  repo?: string;
  baseUrl?: string;
  token?: string;
  outDir?: string;
  dryRun?: boolean;
  runId?: string;
  channelRoot?: string;
  now?: Date;
  fetcher?: ForgejoFetch;
}

type ForgejoApiItem = {
  title?: string;
  body?: string;
  content?: string;
  labels?: Array<string | { name?: string }>;
  html_url?: string;
  url?: string;
};

export function routeForgejoLabels(labels: string[]): ForgejoRoute {
  const normalized = labels.map((label) => label.toLowerCase());
  if (hasAny(normalized, ["security", "sec", "sec-first"])) return "security";
  if (hasAny(normalized, ["seo"])) return "seo";
  if (hasAny(normalized, ["sales", "marketing", "sale-marketing", "sales-marketing"])) return "sales-marketing";
  if (hasAny(normalized, ["client", "report", "client-report"])) return "client-report";
  if (hasAny(normalized, ["user", "users", "feedback", "feedbackpilot", "user-feedback"])) return "user-feedback";
  if (hasAny(normalized, ["data", "pipeline", "data-pipeline"])) return "data-pipeline";
  if (hasAny(normalized, ["devops", "ops", "infra", "ci", "cd"])) return "devops";
  if (hasAny(normalized, ["dev", "bug", "feature"])) return "dev";
  if (hasAny(normalized, ["wiki", "docs"])) return "wiki";
  return "triage";
}

export function createForgejoIntakeReceipt(item: ForgejoItem, now = new Date()): ForgejoIntakeReceipt {
  const findings = findPromptInjection(`${item.title}\n${item.body}`);
  const quarantine = findings.length > 0;
  return {
    source: item.source,
    task: {
      title: item.title,
      body: item.body,
      labels: item.labels,
      route: quarantine ? "human-review" : routeForgejoLabels(item.labels),
      priority: item.labels.some((label) => /critical|urgent|high/i.test(label)) ? "high" : "normal",
    },
    receipts: {
      created_at: now.toISOString(),
      fetched_by: "fable-agent",
      unicode_scan: findings.some((f) => f.kind === "hidden-unicode") ? "failed" : "passed",
      injection_scan: findings.some((f) => f.kind !== "hidden-unicode") ? "failed" : "passed",
      deploy_attempted: false,
      quarantine,
      findings,
    },
  };
}

export async function intakeForgejoItem(opts: ForgejoIntakeOptions): Promise<{ receipt: ForgejoIntakeReceipt; path?: string }> {
  const parsed = parseForgejoRef(opts.ref, opts.repo);
  if (opts.runId) emitChannelEvent(opts.runId, { source: "intake", type: "started", data: { ref: opts.ref, repo: parsed.repo, kind: parsed.kind } }, opts.channelRoot, opts.now);

  const configuredBase = opts.baseUrl?.replace(/\/$/, "")?.replace(/\/$/, "");
  const baseUrl = configuredBase ?? parsed.baseUrl;
  if (!baseUrl) throw new Error("FORGEJO_URL is required unless ISSUE is a full Forgejo URL");

  if (parsed.baseUrl && configuredBase && normalizedOrigin(parsed.baseUrl) !== normalizedOrigin(configuredBase)) {
    throw new Error("Forgejo reference host does not match configured FORGEJO_URL");
  }

  // ponytail: only send FORGEJO_TOKEN to configured base URL; ref-selected origins without a configured base get no token.
  const token = configuredBase ? opts.token : undefined;
  const item = await fetchForgejoItem(baseUrl, parsed, token, opts.fetcher ?? fetch);
  const receipt = createForgejoIntakeReceipt(item, opts.now);

  if (opts.runId) emitChannelEvent(opts.runId, { source: "intake", type: "receipt", data: receipt }, opts.channelRoot, opts.now);
  if (opts.dryRun) return { receipt };

  const outDir = opts.outDir ?? ".fable/tasks";
  fs.mkdirSync(outDir, { recursive: true });
  const file = path.join(outDir, `forgejo-${parsed.kind}-${safeFilePart(parsed.id)}.json`);
  fs.writeFileSync(file, `${JSON.stringify(receipt, null, 2)}\n`);
  return { receipt, path: file };
}

export function parseForgejoRef(ref: string, repo?: string): { kind: ForgejoIntakeKind; repo: string; id: string; baseUrl?: string; url?: string } {
  const url = parseUrl(ref);
  if (url) {
    const parts = url.pathname.split("/").filter(Boolean);
    const markerIndex = parts.findIndex((p) => ["issues", "pulls", "wiki"].includes(p));
    if (markerIndex < 2) throw new Error(`Could not parse Forgejo ref: ${ref}`);
    const kind = parts[markerIndex] === "pulls" ? "pull" : parts[markerIndex] === "wiki" ? "wiki" : "issue";
    return {
      kind,
      repo: `${parts[markerIndex - 2]}/${parts[markerIndex - 1]}`,
      id: decodeURIComponent(parts.slice(markerIndex + 1).join("/")),
      baseUrl: url.origin,
      url: ref,
    };
  }
  if (!repo) throw new Error("--repo is required when ISSUE is not a URL");
  return { kind: "issue", repo, id: ref };
}

async function fetchForgejoItem(baseUrl: string, parsed: ReturnType<typeof parseForgejoRef>, token: string | undefined, fetcher: ForgejoFetch): Promise<ForgejoItem> {
  const apiPath = parsed.kind === "wiki"
    ? `/api/v1/repos/${parsed.repo}/wiki/page/${encodeURIComponent(parsed.id)}`
    : `/api/v1/repos/${parsed.repo}/${parsed.kind === "pull" ? "pulls" : "issues"}/${encodeURIComponent(parsed.id)}`;
  const res = await fetcher(`${baseUrl}${apiPath}`, { headers: token ? { Authorization: `token ${token}` } : undefined });
  if (!res.ok) throw new Error(`Forgejo API returned HTTP ${res.status}`);
  const json = await res.json() as ForgejoApiItem;
  const labels = (json.labels ?? []).map((label) => typeof label === "string" ? label : label.name ?? "").filter(Boolean);
  return {
    source: { type: `forgejo_${parsed.kind}`, url: parsed.url ?? json.html_url ?? json.url, repo: parsed.repo, id: parsed.id },
    title: json.title ?? parsed.id,
    body: json.body ?? json.content ?? "",
    labels,
  };
}

function hasAny(labels: string[], needles: string[]): boolean {
  return needles.some((needle) => labels.includes(needle) || labels.some((label) => label.endsWith(`/${needle}`)));
}

function parseUrl(value: string): URL | undefined {
  try { return new URL(value); } catch { return undefined; }
}

function safeFilePart(value: string): string {
  return value
    .replace(/[^A-Za-z0-9_.-]+/g, "-")
    .replace(/(^-+)|(-+$)/g, "") || "item";
}

function normalizedOrigin(value: string): string {
  return new URL(value).origin.replace(/\/$/, "").toLowerCase();
}