import {
  scopeProjectRef,
  scopedThreadKey,
  scopeThreadRef,
} from "@t3tools/client-runtime/environment";
import type { VcsStatusResult } from "@t3tools/contracts";
import { CloudIcon, FolderGit2Icon, GitPullRequestIcon, TerminalIcon } from "lucide-react";
import { useMemo } from "react";
import { useEnvironment, usePrimaryEnvironmentId } from "../state/environments";
import { useProject } from "../state/entities";
import { useEnvironmentQuery } from "../state/query";
import { useThreadRunningTerminalIds } from "../state/terminalSessions";
import { vcsEnvironment } from "../state/vcs";
import { useUiStateStore } from "../uiStateStore";
import { resolveChangeRequestPresentation } from "../sourceControlPresentation";
import { resolveThreadStatusPill, type ThreadStatusPill } from "./Sidebar.logic";
import type { SidebarThreadSummary } from "../types";
import { formatWorktreePathForDisplay } from "../worktreeCleanup";
import { Tooltip, TooltipPopup, TooltipTrigger } from "./ui/tooltip";

export interface PrStatusIndicator {
  label: string;
  colorClass: string;
  tooltip: string;
  tooltipLead: string;
  tooltipTitle: string;
  url: string;
}

export interface TerminalStatusIndicator {
  label: "Terminal process running";
  colorClass: string;
  pulse: boolean;
}

export type ThreadPr = VcsStatusResult["pr"];

export function settledPrHoverColorClass(state: NonNullable<ThreadPr>["state"]): string {
  switch (state) {
    case "open":
      return "group-hover/v2-row:text-emerald-600 dark:group-hover/v2-row:text-emerald-300/90";
    case "merged":
      return "group-hover/v2-row:text-violet-600 dark:group-hover/v2-row:text-violet-300/90";
    case "closed":
      return "group-hover/v2-row:text-red-600 dark:group-hover/v2-row:text-red-300/90";
  }
}

export function prStatusIndicator(
  pr: ThreadPr,
  provider: VcsStatusResult["sourceControlProvider"] | null | undefined,
): PrStatusIndicator | null {
  function formatPrState(state: NonNullable<ThreadPr>["state"]): string {
    return state.charAt(0).toUpperCase() + state.slice(1);
  }

  function formatPrStatusLead(pr: NonNullable<ThreadPr>, changeRequestShortName: string): string {
    return `${changeRequestShortName} #${pr.number} - ${formatPrState(pr.state)}`;
  }
  if (!pr) return null;
  const presentation = resolveChangeRequestPresentation(provider);

  const tooltipLead = formatPrStatusLead(pr, presentation.shortName);
  const tooltip = `${tooltipLead}: ${pr.title}`;

  if (pr.state === "open") {
    return {
      label: `${presentation.shortName} open`,
      colorClass: "text-emerald-600 dark:text-emerald-300/90",
      tooltip,
      tooltipLead,
      tooltipTitle: pr.title,
      url: pr.url,
    };
  }
  if (pr.state === "closed") {
    return {
      label: `${presentation.shortName} closed`,
      colorClass: "text-red-600 dark:text-red-300/90",
      tooltip,
      tooltipLead,
      tooltipTitle: pr.title,
      url: pr.url,
    };
  }
  if (pr.state === "merged") {
    return {
      label: `${presentation.shortName} merged`,
      colorClass: "text-violet-600 dark:text-violet-300/90",
      tooltip,
      tooltipLead,
      tooltipTitle: pr.title,
      url: pr.url,
    };
  }
  return null;
}

export function ChangeRequestStatusIcon({ className }: { className?: string }) {
  return <GitPullRequestIcon className={className} />;
}

export function PrStatusTooltipContent({ status }: { status: PrStatusIndicator }) {
  return (
    <span className="flex max-w-[min(34rem,calc(100vw-2rem))] items-stretch overflow-hidden whitespace-nowrap">
      <span className="shrink-0 pr-2 font-medium">{status.tooltipLead}</span>
      <span className="min-h-4 shrink-0 border-border/70 border-l" aria-hidden="true" />
      <span className="min-w-0 truncate pl-2">{status.tooltipTitle}</span>
    </span>
  );
}

export function resolveThreadPr(input: {
  threadBranch: string | null;
  gitStatus: VcsStatusResult | null;
  hasDedicatedWorktree: boolean;
}): ThreadPr | null {
  const { threadBranch, gitStatus, hasDedicatedWorktree } = input;
  if (gitStatus === null) {
    return null;
  }

  if (hasDedicatedWorktree) {
    return gitStatus.pr ?? null;
  }

  if (threadBranch === null || gitStatus.refName !== threadBranch) {
    return null;
  }

  return gitStatus.pr ?? null;
}

export function terminalStatusFromRunningIds(
  runningTerminalIds: ReadonlyArray<string>,
): TerminalStatusIndicator | null {
  if (runningTerminalIds.length === 0) {
    return null;
  }
  return {
    label: "Terminal process running",
    colorClass: "text-teal-600 dark:text-teal-300/90",
    pulse: true,
  };
}

export function ThreadWorktreeIndicator({
  thread,
}: {
  thread: Pick<SidebarThreadSummary, "id" | "branch" | "worktreePath">;
}) {
  const worktreePath = thread.worktreePath?.trim();
  if (!worktreePath) {
    return null;
  }

  const displayPath = formatWorktreePathForDisplay(worktreePath);
  const tooltip = thread.branch
    ? `Worktree: ${displayPath} (${thread.branch})`
    : `Worktree: ${displayPath}`;

  return (
    <Tooltip>
      <TooltipTrigger
        render={
          <span
            role="img"
            aria-label={tooltip}
            data-testid={`thread-worktree-${thread.id}`}
            className="inline-flex items-center justify-center"
          />
        }
      >
        <FolderGit2Icon className="size-3 text-muted-foreground/40" />
      </TooltipTrigger>
      <TooltipPopup side="top">{tooltip}</TooltipPopup>
    </Tooltip>
  );
}

export function ThreadStatusLabel({
  status,
  compact = false,
}: {
  status: ThreadStatusPill;
  compact?: boolean;
}) {
  if (compact) {
    return (
      <Tooltip>
        <TooltipTrigger
          render={
            <span
              aria-label={status.label}
              className={`inline-flex size-3.5 shrink-0 items-center justify-center ${status.colorClass}`}
            />
          }
        >
          <span
            className={`size-[9px] rounded-full ${status.dotClass} ${
              status.pulse ? "animate-status-pulse" : ""
            }`}
          />
        </TooltipTrigger>
        <TooltipPopup side="top">{status.label}</TooltipPopup>
      </Tooltip>
    );
  }

  return (
    <Tooltip>
      <TooltipTrigger
        render={
          <span
            aria-label={status.label}
            className={`inline-flex items-center gap-1 text-[10px] ${status.colorClass}`}
          />
        }
      >
        <span
          className={`h-1.5 w-1.5 rounded-full ${status.dotClass} ${
            status.pulse ? "animate-status-pulse" : ""
          }`}
        />
        <span className="hidden md:inline">{status.label}</span>
      </TooltipTrigger>
      <TooltipPopup side="top">{status.label}</TooltipPopup>
    </Tooltip>
  );
}

/**
 * Non-interactive leading status icons for a thread row in compact contexts
 * like the command palette. Shows the change request state icon (if present) and the
 * thread status dot, matching the sidebar's leading indicators.
 */
export function ThreadRowLeadingStatus({ thread }: { thread: SidebarThreadSummary }) {
  const threadRef = scopeThreadRef(thread.environmentId, thread.id);
  const lastVisitedAt = useUiStateStore(
    (state) => state.threadLastVisitedAtById[scopedThreadKey(threadRef)],
  );
  const threadProject = useProject(
    useMemo(
      () => scopeProjectRef(thread.environmentId, thread.projectId),
      [thread.environmentId, thread.projectId],
    ),
  );
  const threadProjectCwd = threadProject?.workspaceRoot ?? null;
  const gitCwd = thread.worktreePath ?? threadProjectCwd;
  const gitStatus = useEnvironmentQuery(
    (thread.branch != null || thread.worktreePath !== null) && gitCwd !== null
      ? vcsEnvironment.status({
          environmentId: thread.environmentId,
          input: { cwd: gitCwd },
        })
      : null,
  );
  const pr = resolveThreadPr({
    threadBranch: thread.branch,
    gitStatus: gitStatus.data,
    hasDedicatedWorktree: thread.worktreePath !== null,
  });
  const prStatus = prStatusIndicator(pr, gitStatus.data?.sourceControlProvider);
  const threadStatus = resolveThreadStatusPill({
    thread: {
      ...thread,
      lastVisitedAt,
    },
  });

  if (!prStatus && !threadStatus) {
    return null;
  }

  return (
    <span className="inline-flex shrink-0 items-center gap-1.5">
      {prStatus ? (
        <Tooltip>
          <TooltipTrigger
            render={
              <span
                aria-label={prStatus.tooltip}
                className={`inline-flex items-center justify-center ${prStatus.colorClass}`}
              />
            }
          >
            <ChangeRequestStatusIcon className="size-3" />
          </TooltipTrigger>
          <TooltipPopup side="top">
            <PrStatusTooltipContent status={prStatus} />
          </TooltipPopup>
        </Tooltip>
      ) : null}
      {threadStatus ? <ThreadStatusLabel status={threadStatus} /> : null}
    </span>
  );
}

/**
 * Non-interactive trailing status icons for a thread row in compact contexts
 * like the command palette. Shows a terminal-running indicator and a remote
 * environment indicator, matching the sidebar's trailing indicators.
 */
export function ThreadRowTrailingStatus({ thread }: { thread: SidebarThreadSummary }) {
  const runningTerminalIds = useThreadRunningTerminalIds({
    environmentId: thread.environmentId,
    threadId: thread.id,
  });
  const environment = useEnvironment(thread.environmentId);
  const primaryEnvironmentId = usePrimaryEnvironmentId();
  const isRemoteThread =
    primaryEnvironmentId !== null && thread.environmentId !== primaryEnvironmentId;
  const remoteEnvLabel = environment?.label ?? null;
  const threadEnvironmentLabel = isRemoteThread ? (remoteEnvLabel ?? "Remote") : null;
  const terminalStatus = terminalStatusFromRunningIds(runningTerminalIds);

  if (!terminalStatus && !isRemoteThread) {
    return null;
  }

  return (
    <span className="inline-flex shrink-0 items-center gap-1.5">
      {terminalStatus ? (
        <Tooltip>
          <TooltipTrigger
            render={
              <span
                role="img"
                aria-label={terminalStatus.label}
                className={`inline-flex items-center justify-center ${terminalStatus.colorClass}`}
              />
            }
          >
            <TerminalIcon
              className={`size-3 ${terminalStatus.pulse ? "animate-status-pulse" : ""}`}
            />
          </TooltipTrigger>
          <TooltipPopup side="top">{terminalStatus.label}</TooltipPopup>
        </Tooltip>
      ) : null}
      {isRemoteThread ? (
        <Tooltip>
          <TooltipTrigger
            render={
              <span
                aria-label={threadEnvironmentLabel ?? "Remote"}
                className="inline-flex items-center justify-center"
              />
            }
          >
            <CloudIcon className="size-3 text-muted-foreground/60" />
          </TooltipTrigger>
          <TooltipPopup side="top">{threadEnvironmentLabel}</TooltipPopup>
        </Tooltip>
      ) : null}
    </span>
  );
}