import { isAbsolute, resolve } from "node:path";
import * as core from "@actions/core";
import { type } from "arktype";
import type { AuthorPermission, PayloadEvent } from "../external.ts";
import { log } from "./cli.ts";
import type { RepoSettings } from "./runContext.ts";

const ShellPermissionInput = type.enumerated("disabled", "restricted", "enabled");
const PushPermissionInput = type.enumerated("disabled", "restricted", "enabled");

export const Inputs = type({
  prompt: "string",
  "model?": type.string.or("undefined"),
  "context_window?": type.number.or("undefined"),
  "timeout?": type.string.or("undefined"),
  "push?": PushPermissionInput.or("undefined"),
  "shell?": ShellPermissionInput.or("undefined"),
  "cwd?": type.string.or("undefined"),
  "output_schema?": type.string.or("undefined"),
});

export type Inputs = typeof Inputs.infer;

function isPayloadEvent(value: unknown): value is PayloadEvent {
  return typeof value === "object" && value !== null && "trigger" in value;
}

function resolveCwd(cwd: string | undefined): string | undefined {
  const workspace = process.env.GITHUB_WORKSPACE;
  if (!cwd) return workspace;
  if (isAbsolute(cwd)) return cwd;
  return workspace ? resolve(workspace, cwd) : cwd;
}

const COLLABORATOR_PERMISSIONS: AuthorPermission[] = ["admin", "maintain", "write"];

function isCollaborator(event: PayloadEvent): boolean {
  const perm = event.authorPermission;
  return perm !== undefined && COLLABORATOR_PERMISSIONS.includes(perm);
}

export type ResolvedPromptInput = string | Record<string, unknown>;

export function resolvePromptInput(): ResolvedPromptInput {
  const prompt = core.getInput("prompt", { required: true });

  let parsed: unknown;
  try {
    parsed = JSON.parse(prompt);
  } catch {
    return prompt;
  }

  if (!parsed || typeof parsed !== "object") {
    return prompt;
  }

  return parsed as Record<string, unknown>;
}

function resolveNonPromptInputs() {
  const contextWindowRaw = core.getInput("context_window");
  return Inputs.omit("prompt").assert({
    model: core.getInput("model") || undefined,
    context_window: contextWindowRaw ? parseInt(contextWindowRaw, 10) : undefined,
    timeout: core.getInput("timeout") || undefined,
    cwd: core.getInput("cwd") || undefined,
    push: (core.getInput("push") as "disabled" | "restricted" | "enabled") || undefined,
    shell: (core.getInput("shell") as "disabled" | "restricted" | "enabled") || undefined,
  });
}

export function resolvePayload(
  resolvedPromptInput: ResolvedPromptInput,
  repoSettings: RepoSettings
) {
  // Helper: extract a string field from an unknown JSON payload
  function str(obj: Record<string, unknown> | undefined, key: string): string | undefined {
    const v = obj?.[key];
    return typeof v === "string" ? v : undefined;
  }

  const [prompt, jsonPayload] =
    typeof resolvedPromptInput !== "string"
      ? [
          str(resolvedPromptInput, "prompt") ?? JSON.stringify(resolvedPromptInput),
          resolvedPromptInput,
        ]
      : [resolvedPromptInput, undefined];

  const inputs = resolveNonPromptInputs();

  const rawEvent = jsonPayload?.["event"];
  const event: PayloadEvent = isPayloadEvent(rawEvent) ? rawEvent : { trigger: "unknown" };

  const model =
    str(jsonPayload, "model") ?? inputs.model ?? repoSettings.model ?? process.env.OLLAMA_MODEL ?? undefined;

  const contextWindowStr = str(jsonPayload, "context_window");
  const contextWindow =
    (contextWindowStr ? parseInt(contextWindowStr, 10) : undefined) ??
    inputs.context_window ??
    undefined;

  const isNonCollaborator = !isCollaborator(event);
  const repoShell = repoSettings.shell ?? "restricted";
  const inputShell = inputs.shell;

  let resolvedShell = repoShell;
  if (inputShell === "disabled") {
    resolvedShell = "disabled";
  } else if (inputShell === "restricted" && resolvedShell === "enabled") {
    resolvedShell = "restricted";
  }
  if (isNonCollaborator && resolvedShell === "enabled") {
    resolvedShell = "restricted";
  }

  return {
    "~shockbot": true as const,
    model,
    contextWindow,
    prompt,
    triggerer:
      str(jsonPayload, "triggerer") ?? process.env.GITHUB_ACTOR ?? undefined,
    eventInstructions: str(jsonPayload, "eventInstructions"),
    event,
    timeout: inputs.timeout ?? str(jsonPayload, "timeout"),
    cwd: resolveCwd(inputs.cwd),
    progressComment: (() => {
      const pc = jsonPayload?.["progressComment"];
      if (!pc || typeof pc !== "object") return undefined;
      const p = pc as Record<string, unknown>;
      if (typeof p.id !== "string" || p.type !== "issue") return undefined;
      return { id: p.id, type: "issue" as const };
    })(),

    push: inputs.push ?? repoSettings.push ?? "restricted",
    shell: resolvedShell,
  };
}

export type ResolvedPayload = ReturnType<typeof resolvePayload>;

export function resolveOutputSchema(): Record<string, unknown> | undefined {
  const raw = core.getInput("output_schema");
  if (!raw) return undefined;

  let parsed: unknown;
  try {
    parsed = JSON.parse(raw);
  } catch {
    throw new Error(`invalid output_schema: not valid JSON`);
  }
  if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
    throw new Error(`invalid output_schema: must be a JSON object`);
  }
  log.info("» structured output schema provided — output will be required");
  return parsed as Record<string, unknown>;
}