import type { ChatResponse } from "./board-actions";
import { getWorkPackageSpec } from "./work-package-specs";
import type { WorkPackage, WorkPackageOutput } from "./work-package-types";

export const REAL_AUTOMATION_DISCLAIMER =
  "This output was generated by the user-configured LLM. No real engineering toolchain, certification authority, patent database, hardware test bench, or external enterprise system was executed.";

function nowIso() {
  return new Date().toISOString();
}

function newId(prefix: string) {
  return `${prefix}-${crypto.randomUUID()}`;
}

function productBriefFromBoard(workPackages: WorkPackage[]) {
  return workPackages
    .flatMap((workPackage) => workPackage.inputFiles)
    .find((input) => input.startsWith("Product brief: "))
    ?.replace(/^Product brief:\s*/, "");
}

function completedTasks(workPackage: WorkPackage) {
  return workPackage.tasks.map((task) => ({
    ...task,
    status: "done" as const,
  }));
}

function previousOutputsSummary(workPackages: WorkPackage[], currentId: string) {
  return workPackages
    .filter((workPackage) => workPackage.id !== currentId)
    .flatMap((workPackage) =>
      workPackage.outputs.map((output) =>
        [
          `Package: ${workPackage.title}`,
          `Output: ${output.title}`,
          output.content.slice(0, 500),
        ].join("\n"),
      ),
    )
    .slice(-6)
    .join("\n\n");
}

function buildOutputTitle(workPackage: WorkPackage, instruction: string) {
  return instruction
    ? `${workPackage.shortName} Automation - ${instruction}`
    : `${workPackage.shortName} Automation Output`;
}

export function buildExecutionPrompt(args: {
  workPackage: WorkPackage;
  workPackages: WorkPackage[];
  productIdea?: string;
  instruction?: string;
}) {
  const { workPackage, workPackages, instruction } = args;
  const spec = getWorkPackageSpec(workPackage);
  const productIdea =
    args.productIdea?.trim() || productBriefFromBoard(workPackages) || "";
  const priorContext = previousOutputsSummary(workPackages, workPackage.id);

  return [
    `You are completing the work package "${workPackage.title}" (${workPackage.shortName}).`,
    productIdea ? `Product idea: ${productIdea}` : "",
    `Objective: ${workPackage.objective}`,
    workPackage.inputFiles.length
      ? `Expected inputs: ${workPackage.inputFiles.join(", ")}`
      : "",
    workPackage.outputFiles.length
      ? `Expected outputs: ${workPackage.outputFiles.join(", ")}`
      : "",
    workPackage.coreSections.length
      ? `Core sections: ${workPackage.coreSections.join(", ")}`
      : "",
    workPackage.deliverables?.length
      ? `Deliverables: ${workPackage.deliverables
          .map((item) => `${item.name} (${item.required ? "required" : "optional"})`)
          .join(", ")}`
      : "",
    spec?.askHint ? `Planning hint: ${spec.askHint}` : "",
    instruction ? `User instruction: ${instruction}` : "",
    priorContext
      ? `Recent outputs from other packages for cross-reference:\n\n${priorContext}`
      : "",
    "Return only the actual artifact content in markdown.",
    "Be concrete and package-specific.",
    "Do not mention being an AI, do not return JSON, and do not mention the disclaimer.",
  ]
    .filter(Boolean)
    .join("\n\n");
}

export function buildRealExecutionResponse(args: {
  workPackage: WorkPackage;
  generatedContent: string;
  instruction?: string;
  productIdea?: string;
}): ChatResponse {
  const { workPackage, generatedContent, instruction } = args;
  const spec = getWorkPackageSpec(workPackage);

  const output: WorkPackageOutput = {
    id: newId("out"),
    title: buildOutputTitle(workPackage, instruction?.trim() || ""),
    type: spec?.outputType ?? "text",
    content: generatedContent,
    createdAt: nowIso(),
    sourceTaskId: workPackage.tasks[0]?.id ?? null,
    executionMode: "real",
    disclaimer: REAL_AUTOMATION_DISCLAIMER,
  };

  return {
    assistantMessage: `${workPackage.shortName} automation completed with the configured model.`,
    boardAction: {
      type: "update",
      workPackageId: workPackage.id,
      fields: {
        status: "done",
        tasks: completedTasks(workPackage),
        outputs: [...workPackage.outputs, output],
      },
    },
  };
}

export function buildAutomationInstruction(workPackage: WorkPackage) {
  return `Generate all expected outputs for ${workPackage.title} and complete this work package.`;
}