"use client";

import type { ReactNode } from "react";
import type { WorkPackage } from "@/lib/work-package-types";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { WorkPackageOutputCard } from "@/components/WorkPackageOutput";
import { MarkdownContent } from "@/components/MarkdownContent";
import {
  ArrowLeft,
  CheckCircle2,
  ClipboardCopy,
  HelpCircle,
  ListTodo,
  LoaderCircle,
  Play,
  SlidersHorizontal,
} from "lucide-react";
import {
  getWorkPackageVersion,
  getWorkPackageVisualState,
} from "@/lib/work-package-ui";
import { buildPackageQuestionPrompt } from "@/lib/package-chat-context";

function statusLabel(status: WorkPackage["status"]) {
  if (status === "todo") return "To do";
  if (status === "in_progress") return "In progress";
  return "Done";
}

function priorityLabel(priority: WorkPackage["priority"]) {
  if (priority === "high") return "High";
  if (priority === "medium") return "Medium";
  return "Low";
}

function Section(props: {
  title: string;
  children: ReactNode;
  action?: ReactNode;
}) {
  return (
    <section className="rounded-2xl bg-background/72 px-3 py-3 shadow-sm ring-1 ring-black/5">
      <div className="mb-2 flex items-center justify-between gap-2">
        <div className="text-[11px] font-semibold uppercase tracking-[0.04em] text-muted-foreground">
          {props.title}
        </div>
        {props.action}
      </div>
      {props.children}
    </section>
  );
}

function createExcerpt(value: string, maxLength = 220) {
  const normalized = value.trim().replace(/\s+/g, " ");
  if (normalized.length <= maxLength) return normalized;
  return `${normalized.slice(0, maxLength - 1).trimEnd()}...`;
}

function AskAboutButton(props: {
  label: string;
  onClick: () => void;
}) {
  return (
    <Button
      variant="ghost"
      className="h-7 rounded-lg px-2 text-[11px] text-muted-foreground"
      aria-label={props.label}
      onClick={props.onClick}
    >
      <HelpCircle className="h-3.5 w-3.5" />
      <span className="ml-1">{props.label}</span>
    </Button>
  );
}

export function WorkPackageDetail(props: {
  workPackage?: WorkPackage;
  activeWorkPackageId?: string;
  onPrefill: (text: string) => void;
  onBack: () => void;
}) {
  const { workPackage: wp, activeWorkPackageId, onPrefill, onBack } = props;

  if (!wp) {
    return (
      <div className="px-3 pb-3 md:px-4">
        <div className="rounded-2xl bg-background/70 px-4 py-4 text-sm text-muted-foreground shadow-sm ring-1 ring-black/5">
          Select a work package to inspect its details.
        </div>
      </div>
    );
  }

  const refName = wp.shortName || wp.title;
  const latestOutput = wp.outputs.at(-1);
  const visualState = getWorkPackageVisualState({
    workPackage: wp,
    activeWorkPackageId,
  });
  const version = getWorkPackageVersion(wp);
  const latestOutputExcerpt = latestOutput ? createExcerpt(latestOutput.content) : "";

  async function copyReference() {
    try {
      await navigator.clipboard.writeText(`@${refName} `);
    } catch {
      // ignore
    }
  }

  return (
    <div className="flex h-full min-h-0 flex-col">
      <div className="px-3 py-2 md:px-4">
        <div className="rounded-2xl bg-background/72 px-3 py-2.5 shadow-sm ring-1 ring-black/5">
          <div className="flex items-center justify-between gap-3">
            <div className="flex min-w-0 items-center gap-2">
              <Button
                variant="ghost"
                size="icon"
                className="h-8 w-8 rounded-xl"
                onClick={onBack}
              >
                <ArrowLeft className="h-4 w-4" />
              </Button>
              <div className="min-w-0">
                <div className="truncate text-sm font-semibold">{wp.title}</div>
                <div className="truncate text-xs text-muted-foreground">
                  Work package detail view
                </div>
              </div>
            </div>
            <div className="flex shrink-0 items-center gap-1">
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 rounded-lg"
                onClick={() => onPrefill(`@${refName} ask `)}
              >
                <HelpCircle className="h-4 w-4" />
              </Button>
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 rounded-lg"
                onClick={() => onPrefill(`@${refName} plan `)}
              >
                <ListTodo className="h-4 w-4" />
              </Button>
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 rounded-lg"
                onClick={() => onPrefill(`@${refName} change `)}
              >
                <SlidersHorizontal className="h-4 w-4" />
              </Button>
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 rounded-lg"
                onClick={() => onPrefill(`@${refName} execute `)}
              >
                <Play className="h-4 w-4" />
              </Button>
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 rounded-lg"
                onClick={copyReference}
              >
                <ClipboardCopy className="h-4 w-4" />
              </Button>
            </div>
          </div>
        </div>
      </div>

      <div className="min-h-0 flex-1 overflow-y-auto overscroll-contain px-3 pb-3 md:px-4">
        <div className="space-y-3">
          <section className="rounded-2xl bg-background/72 px-4 py-4 shadow-sm ring-1 ring-black/5">
            <div className="flex flex-wrap items-start justify-between gap-3">
              <div className="min-w-0">
                <h2 className="text-base font-semibold">{wp.title}</h2>
                <div className="mt-1 flex flex-wrap items-center gap-1">
                  <Badge variant="secondary" className="text-[11px]">
                    {wp.shortName}
                  </Badge>
                  <Badge variant="outline" className="text-[11px]">
                    {statusLabel(wp.status)}
                  </Badge>
                  <Badge variant="outline" className="text-[11px]">
                    {priorityLabel(wp.priority)}
                  </Badge>
                  <Badge variant="outline" className="text-[11px]">
                    {wp.phase}
                  </Badge>
                  {visualState === "running" ? (
                    <Badge
                      variant="outline"
                      className="gap-1 border-amber-300 bg-amber-50 text-[11px] text-amber-700"
                    >
                      <LoaderCircle className="h-3 w-3 animate-spin" />
                      Running
                    </Badge>
                  ) : null}
                  {visualState === "done" && version ? (
                    <Badge
                      variant="outline"
                      className="gap-1 border-emerald-300 bg-emerald-50 text-[11px] text-emerald-700"
                    >
                      <CheckCircle2 className="h-3 w-3" />
                      {version}
                    </Badge>
                  ) : null}
                </div>
              </div>
            </div>

            <p className="mt-3 text-sm leading-6 text-muted-foreground">
              {wp.objective}
            </p>
            <div className="mt-3">
              <AskAboutButton
                label="Ask about objective"
                onClick={() =>
                  onPrefill(
                    buildPackageQuestionPrompt({
                      packageRef: refName,
                      label: "objective",
                      excerpt: wp.objective,
                    }),
                  )
                }
              />
            </div>
          </section>

          <Section title="Primary output">
            {latestOutput ? (
              <div className="space-y-3">
                <div className="flex flex-wrap items-center gap-2">
                  <Badge variant="secondary" className="text-[11px]">
                    {latestOutput.title}
                  </Badge>
                  <Badge variant="outline" className="text-[11px]">
                    {latestOutput.executionMode === "real"
                      ? "LLM Automation"
                      : "Simulated Execution"}
                  </Badge>
                  <Badge variant="outline" className="text-[11px]">
                    {latestOutput.type}
                  </Badge>
                </div>
                <div className="rounded-xl bg-muted/20 px-4 py-4">
                  <MarkdownContent
                    content={latestOutput.content}
                    onAskExcerpt={(excerpt) =>
                      onPrefill(
                        buildPackageQuestionPrompt({
                          packageRef: refName,
                          label: "output excerpt",
                          excerpt,
                        }),
                      )
                    }
                  />
                </div>
                <div>
                  <AskAboutButton
                    label="Ask about latest output"
                    onClick={() =>
                      onPrefill(
                        buildPackageQuestionPrompt({
                          packageRef: refName,
                          label: "latest output",
                          excerpt: latestOutputExcerpt,
                        }),
                      )
                    }
                  />
                </div>
                <div className="rounded-xl bg-muted/32 p-2.5 text-[11px] leading-5 text-muted-foreground">
                  {latestOutput.disclaimer}
                </div>
              </div>
            ) : (
              <div className="text-sm leading-6 text-muted-foreground">
                No output yet. Run the package to generate its primary artifact.
              </div>
            )}
          </Section>

          {wp.outputs.length > 1 ? (
            <details className="rounded-2xl bg-background/72 px-3 py-3 shadow-sm ring-1 ring-black/5">
              <summary className="cursor-pointer text-[11px] font-semibold uppercase tracking-[0.04em] text-muted-foreground">
                Output history
              </summary>
              <div className="mt-3 space-y-2">
                {wp.outputs
                  .slice(0, -1)
                  .reverse()
                  .map((output) => (
                    <WorkPackageOutputCard
                      key={output.id}
                      output={output}
                    />
                  ))}
              </div>
            </details>
          ) : null}

          <details className="rounded-2xl bg-background/72 px-3 py-3 shadow-sm ring-1 ring-black/5">
            <summary className="cursor-pointer text-[11px] font-semibold uppercase tracking-[0.04em] text-muted-foreground">
              Package context
            </summary>
            <div className="mt-3 grid gap-3 xl:grid-cols-[minmax(0,1.15fr)_minmax(0,0.85fr)]">
              <div className="space-y-3">
                <Section title="Expected outputs">
                  <div className="flex flex-wrap gap-1.5">
                    {wp.outputFiles.map((output) => (
                      <Badge key={output} variant="outline" className="text-[11px]">
                        {output}
                      </Badge>
                    ))}
                  </div>
                </Section>

                {wp.inputFiles.length ? (
                  <Section title="Expected inputs">
                    <div className="text-sm leading-6 text-muted-foreground">
                      {wp.inputFiles.join(", ")}
                    </div>
                  </Section>
                ) : null}

                {wp.coreSections.length ? (
                  <Section title="Core sections">
                    <div className="text-sm leading-6 text-muted-foreground">
                      {wp.coreSections.join(", ")}
                    </div>
                  </Section>
                ) : null}
              </div>

              <Section title="Tasks">
                <div className="space-y-2">
                  {wp.tasks.map((task) => (
                    <div
                      key={task.id}
                      className="rounded-xl bg-muted/28 px-3 py-2.5 text-sm shadow-sm ring-1 ring-black/5"
                    >
                      <div className="flex items-start justify-between gap-3">
                        <div className="font-medium">{task.title}</div>
                        <AskAboutButton
                          label="Ask about this task"
                          onClick={() =>
                            onPrefill(
                              buildPackageQuestionPrompt({
                                packageRef: refName,
                                label: "task",
                                excerpt: `${task.title}: ${task.description}`,
                              }),
                            )
                          }
                        />
                      </div>
                      <div className="mt-1 leading-5 text-muted-foreground">
                        {task.description}
                      </div>
                    </div>
                  ))}
                </div>
              </Section>
            </div>
          </details>
        </div>
      </div>
    </div>
  );
}