import { useCallback, useEffect, useState, lazy, Suspense } from "react";
import type { ProjectInfo } from "../api";
import type { ColorTheme, Column, MergeResult, Task, TaskCreateInput, ThemeMode, GithubIssueAction } from "@fusion/core";
import type { UseProjectActionsResult } from "../hooks/useProjectActions";
import type { ModalManager } from "../hooks/useModalManager";
import type { UseTaskHandlersResult } from "../hooks/useTaskHandlers";
import type { Toast, ToastType } from "../hooks/useToast";
import { ModalErrorBoundary } from "./ErrorBoundary";
import { TaskDetailModal } from "./TaskDetailModal";
import { GitHubImportModal } from "./GitHubImportModal";
import { PlanningModeModal } from "./PlanningModeModal";
import { SubtaskBreakdownModal } from "./SubtaskBreakdownModal";
import { TerminalModal } from "./TerminalModal";
import { ScriptsModal } from "./ScriptsModal";
import { FileBrowserModal } from "./FileBrowserModal";
import { TodoModal } from "./TodoModal";
import { UsageIndicator } from "./UsageIndicator";
import { ScheduledTasksModal } from "./ScheduledTasksModal";
import { NewTaskModal } from "./NewTaskModal";
import { SystemStatsModal } from "./SystemStatsModal";
import { ActivityLogModal } from "./ActivityLogModal";
import { GitManagerModal } from "./GitManagerModal";
import { WorkflowStepManager } from "./WorkflowStepManager";
import { AgentListModal } from "./AgentListModal";
import { ModelOnboardingModal } from "./ModelOnboardingModal";
import { ToastContainer } from "./ToastContainer";
import { GroupTaskModal } from "./GroupTaskModal";
import { useNavigationHistoryContext } from "../hooks/useNavigationHistory";

const SetupWizardModal = lazy(() => import("./SetupWizardModal").then((m) => ({ default: m.SetupWizardModal })));
const SettingsModal = lazy(() => import("./SettingsModal").then((m) => ({ default: m.SettingsModal })));

function prefetchSettingsModal() {
  const idle: (cb: () => void, opts?: { timeout?: number }) => number =
    (typeof window !== "undefined" &&
      (window as Window & {
        requestIdleCallback?: (cb: () => void, opts?: { timeout?: number }) => number;
      }).requestIdleCallback) ||
    ((cb: () => void) => globalThis.setTimeout(cb, 200) as unknown as number);

  idle(() => {
    void import("./SettingsModal");
  }, { timeout: 1_500 });
}

interface AppModalsProps {
  projectId?: string;
  tasks: Task[];
  projects: ProjectInfo[];
  currentProject: ProjectInfo | null;
  addToast: (message: string, type?: ToastType) => void;
  toasts: Toast[];
  removeToast: (id: number) => void;
  modalManager: ModalManager;
  projectActions: Pick<UseProjectActionsResult, "handleAddProject" | "handleSetupComplete" | "handleModelOnboardingComplete">;
  taskHandlers: Pick<UseTaskHandlersResult, "handleModalCreate" | "handlePlanningTaskCreated" | "handlePlanningTasksCreated" | "handleSubtaskTasksCreated" | "handleGitHubImport">;
  taskOperations: {
    moveTask: (taskId: string, column: Column, optionsOrPosition?: { preserveProgress?: boolean } | number) => Promise<Task>;
    deleteTask: (taskId: string, options?: {
      removeDependencyReferences?: boolean;
      removeLineageReferences?: boolean;
      githubIssueAction?: GithubIssueAction;
      allowResurrection?: boolean;
    }) => Promise<Task>;
    mergeTask: (taskId: string) => Promise<MergeResult>;
    archiveTask: (taskId: string, options?: { removeLineageReferences?: boolean }) => Promise<Task>;
    retryTask: (taskId: string) => Promise<Task>;
    resetTask: (taskId: string) => Promise<Task>;
    duplicateTask: (taskId: string) => Promise<Task>;
  };
  deepLink: {
    handleDetailClose: () => void;
  };
  settings: {
    prAuthAvailable: boolean;
    themeMode: ThemeMode;
    colorTheme: ColorTheme;
    dashboardFontScalePct: number;
    setThemeMode: (mode: ThemeMode) => void;
    setColorTheme: (theme: ColorTheme) => void;
    setDashboardFontScalePct: (scalePct: number) => void;
  };
  /** Optional override for the settings modal close handler. When provided, this is called instead of modalManager.closeSettings. */
  onSettingsClose?: () => void;
  /** Optional callback to reopen the onboarding guide from Settings. Closes Settings and opens ModelOnboardingModal. */
  onReopenOnboarding?: () => void;
  /** Optional callback to open mailbox approvals from Settings. */
  onOpenApprovals?: (approvalId?: string) => void;
}

export function AppModals({
  projectId,
  tasks,
  projects,
  currentProject,
  addToast,
  toasts,
  removeToast,
  modalManager,
  projectActions,
  taskHandlers,
  taskOperations,
  deepLink,
  settings,
  onSettingsClose,
  onReopenOnboarding,
  onOpenApprovals,
}: AppModalsProps) {
  const { pushNav } = useNavigationHistoryContext();
  const [firstCreatedTask, setFirstCreatedTask] = useState<Task | null>(null);
  const detailTask = modalManager.detailTask
    ? (() => {
        const liveTask = tasks.find((task) => task.id === modalManager.detailTask?.id);
        if (!liveTask) {
          return modalManager.detailTask;
        }

        if ("prompt" in modalManager.detailTask) {
          return {
            ...modalManager.detailTask,
            ...liveTask,
            prompt: modalManager.detailTask.prompt,
            log: modalManager.detailTask.log,
          };
        }

        return liveTask;
      })()
    : null;

  // Use the override handler if provided, otherwise fall back to modalManager.closeSettings
  const handleSettingsClose = onSettingsClose ?? modalManager.closeSettings;

  const handleOpenNewTask = useCallback(() => {
    modalManager.openNewTask();
  }, [modalManager]);

  const handleOpenGitHubImport = useCallback(() => {
    modalManager.openGitHubImport();
  }, [modalManager]);

  const openDetailTaskWithNav = useCallback(
    (
      task: Parameters<typeof modalManager.openDetailTask>[0],
      tab?: Parameters<typeof modalManager.openDetailTask>[1],
    ) => {
      modalManager.openDetailTask(task, tab);
      pushNav({ type: "modal", close: modalManager.closeDetailTask });
    },
    [modalManager, pushNav],
  );

  const openGroupModalWithNav = useCallback((groupId: string) => {
    modalManager.openGroupModal(groupId);
    pushNav({ type: "modal", close: modalManager.closeGroupModal });
  }, [modalManager, pushNav]);

  const handleOnboardingViewTask = useCallback((task: Task) => {
    setFirstCreatedTask(null);
    modalManager.closeModelOnboarding();
    openDetailTaskWithNav(task);
  }, [modalManager, openDetailTaskWithNav]);

  const handleModalCreateWithOnboardingTracking = useCallback(
    async (input: TaskCreateInput): Promise<Task> => {
      const task = await taskHandlers.handleModalCreate(input);
      if (modalManager.modelOnboardingOpen) {
        setFirstCreatedTask(task);
      }
      return task;
    },
    [taskHandlers.handleModalCreate, modalManager.modelOnboardingOpen],
  );

  useEffect(() => {
    if (!modalManager.modelOnboardingOpen && firstCreatedTask) {
      setFirstCreatedTask(null);
    }
  }, [modalManager.modelOnboardingOpen, firstCreatedTask]);

  useEffect(() => {
    prefetchSettingsModal();
  }, []);

  return (
    <>
      {detailTask && (
        <ModalErrorBoundary>
          <TaskDetailModal
            task={detailTask}
            projectId={projectId}
            tasks={tasks}
            onClose={deepLink.handleDetailClose}
            onOpenDetail={openDetailTaskWithNav}
            mobileHeaderMode={modalManager.detailTaskOrigin === "list-mobile" ? "back" : "close"}
            onMoveTask={taskOperations.moveTask}
            onDeleteTask={taskOperations.deleteTask}
            onMergeTask={taskOperations.mergeTask}
            onArchiveTask={taskOperations.archiveTask}
            onRetryTask={taskOperations.retryTask}
            onResetTask={taskOperations.resetTask}
            onDuplicateTask={taskOperations.duplicateTask}
            onTaskUpdated={modalManager.updateDetailTask}
            addToast={addToast}
            prAuthAvailable={settings.prAuthAvailable}
            initialTab={modalManager.detailTaskInitialTab}
          />
        </ModalErrorBoundary>
      )}

      {modalManager.groupModalGroupId && (
        <ModalErrorBoundary>
          <GroupTaskModal
            isOpen={Boolean(modalManager.groupModalGroupId)}
            onClose={modalManager.closeGroupModal}
            groupId={modalManager.groupModalGroupId}
            projectId={projectId}
            onOpenMemberTask={(taskId) => {
              const memberTask = tasks.find((task) => task.id === taskId);
              if (memberTask) {
                openDetailTaskWithNav(memberTask);
              }
            }}
          />
        </ModalErrorBoundary>
      )}

      {modalManager.settingsOpen && (
        <ModalErrorBoundary>
          <Suspense fallback={null}>
            <SettingsModal
              onClose={handleSettingsClose}
              addToast={addToast}
              initialSection={modalManager.settingsInitialSection}
              projectId={projectId}
              themeMode={settings.themeMode}
              colorTheme={settings.colorTheme}
              onThemeModeChange={settings.setThemeMode}
              onColorThemeChange={settings.setColorTheme}
              dashboardFontScalePct={settings.dashboardFontScalePct}
              onDashboardFontScaleChange={settings.setDashboardFontScalePct}
              onReopenOnboarding={onReopenOnboarding}
              onOpenApprovals={onOpenApprovals}
            />
          </Suspense>
        </ModalErrorBoundary>
      )}

      <GitHubImportModal
        isOpen={modalManager.githubImportOpen}
        onClose={modalManager.closeGitHubImport}
        onImport={taskHandlers.handleGitHubImport}
        tasks={tasks}
        projectId={projectId}
      />

      <ModalErrorBoundary>
        <PlanningModeModal
          isOpen={modalManager.isPlanningOpen}
          onClose={modalManager.closePlanning}
          onTaskCreated={taskHandlers.handlePlanningTaskCreated}
          onTasksCreated={taskHandlers.handlePlanningTasksCreated}
          tasks={tasks}
          initialPlan={modalManager.planningInitialPlan ?? undefined}
          projectId={projectId}
          resumeSessionId={modalManager.planningResumeSessionId}
        />
      </ModalErrorBoundary>

      <ModalErrorBoundary>
        <SubtaskBreakdownModal
          isOpen={modalManager.isSubtaskOpen}
          onClose={modalManager.closeSubtask}
          initialDescription={modalManager.subtaskInitialDescription ?? ""}
          onTasksCreated={taskHandlers.handleSubtaskTasksCreated}
          projectId={projectId}
          resumeSessionId={modalManager.subtaskResumeSessionId}
          onOpenGroupModal={openGroupModalWithNav}
        />
      </ModalErrorBoundary>

      <TerminalModal
        isOpen={modalManager.terminalOpen}
        onClose={modalManager.closeTerminal}
        initialCommand={modalManager.terminalInitialCommand}
        projectId={projectId}
      />

      <ScriptsModal
        isOpen={modalManager.scriptsOpen}
        onClose={modalManager.closeScripts}
        addToast={addToast}
        onRunScript={modalManager.runScript}
        projectId={projectId}
      />

      {modalManager.filesOpen && (
        <FileBrowserModal
          initialWorkspace={modalManager.fileBrowserWorkspace}
          initialFile={modalManager.fileBrowserInitialFile}
          isOpen={true}
          onClose={modalManager.closeFiles}
          onWorkspaceChange={modalManager.setFileWorkspace}
          projectId={projectId}
        />
      )}

      {modalManager.todosOpen && (
        <TodoModal
          isOpen={true}
          onClose={modalManager.closeTodos}
          addToast={addToast}
          projectId={projectId}
          onPlanningMode={modalManager.openPlanningWithInitialPlan}
        />
      )}

      <UsageIndicator
        isOpen={modalManager.usageOpen}
        onClose={modalManager.closeUsage}
        projectId={projectId}
        anchorRect={modalManager.usageAnchorRect}
      />

      <SystemStatsModal
        isOpen={modalManager.systemStatsOpen}
        onClose={modalManager.closeSystemStats}
        projectId={projectId}
      />

      {modalManager.schedulesOpen && (
        <ScheduledTasksModal
          onClose={modalManager.closeSchedules}
          addToast={addToast}
          projectId={projectId}
        />
      )}

      <ModalErrorBoundary>
        <NewTaskModal
          isOpen={modalManager.newTaskModalOpen}
          onClose={modalManager.closeNewTask}
          tasks={tasks}
          onCreateTask={handleModalCreateWithOnboardingTracking}
          addToast={addToast}
          projectId={projectId}
        />
      </ModalErrorBoundary>

      <ActivityLogModal
        isOpen={modalManager.activityLogOpen}
        onClose={modalManager.closeActivityLog}
        tasks={tasks}
        projectId={projectId}
        projects={projects}
        currentProject={currentProject}
        onOpenTaskDetail={(taskId) => {
          const task = tasks.find((candidate) => candidate.id === taskId);
          if (task) {
            openDetailTaskWithNav(task);
          }
        }}
      />

      <ModalErrorBoundary>
        <GitManagerModal
          isOpen={modalManager.gitManagerOpen}
          onClose={modalManager.closeGitManager}
          tasks={tasks}
          addToast={addToast}
          projectId={projectId}
        />
      </ModalErrorBoundary>

      <ModalErrorBoundary>
        <WorkflowStepManager
          isOpen={modalManager.workflowStepsOpen}
          onClose={modalManager.closeWorkflowSteps}
          addToast={addToast}
          projectId={projectId}
        />
      </ModalErrorBoundary>

      <AgentListModal
        isOpen={modalManager.agentsOpen}
        onClose={modalManager.closeAgents}
        addToast={addToast}
        projectId={projectId}
      />

      {modalManager.setupWizardOpen && (
        <Suspense fallback={null}>
          <SetupWizardModal
            onProjectRegistered={projectActions.handleSetupComplete}
            onClose={modalManager.closeSetupWizard}
          />
        </Suspense>
      )}

      {modalManager.modelOnboardingOpen && (
        <ModelOnboardingModal
          onComplete={projectActions.handleModelOnboardingComplete}
          addToast={addToast}
          projectId={projectId ?? ""}
          onOpenSetupWizard={projectActions.handleAddProject}
          onOpenNewTask={handleOpenNewTask}
          onOpenGitHubImport={handleOpenGitHubImport}
          firstCreatedTask={firstCreatedTask}
          onViewTask={handleOnboardingViewTask}
        />
      )}

      <ToastContainer toasts={toasts} onRemove={removeToast} />
    </>
  );
}