// Rôle : fournit l'outil task planner avec tâches récurrentes, parents, pré requis et échange texte.
import { useEffect, useMemo, useRef, useState } from "react";
import { useDraftForm } from "../../../hooks/useDraftForm.js";
import { TaskPlannerBranch } from "./TaskPlannerBranch.jsx";
import { TaskPlannerSettings } from "./TaskPlannerSettings.jsx";
import { TaskPlannerTopbar } from "./TaskPlannerTopbar.jsx";
import {
  applyDueResets,
  getTaskParentMap
} from "./taskPlannerUtils.js";
import { useTaskPlannerReorder } from "./useTaskPlannerReorder.js";

export function TaskPlannerModule({ toolboxId, moduleId, context, editing, textExchangeOpen }) {
  const data = context.normalizeTaskPlannerData(context.getModuleData(toolboxId, moduleId, { tasks: [] }));
  const textContent = context.moduleText?.taskPlanner || {};
  const taskDraft = useDraftForm({ title: "", type: "daily", category: "" });
  const categoryOptions = useMemo(() => [
    ...data.categoryOrder,
    ...data.tasks.map((task) => task.category).filter(Boolean).filter((category) => !data.categoryOrder.includes(category))
  ], [data.categoryOrder, data.tasks]);
  const [nowMs, setNowMs] = useState(() => Date.now());
  const [settingsOpen, setSettingsOpen] = useState(false);
  const [openDescriptions, setOpenDescriptions] = useState(() => new Set());
  const [openTaskSettings, setOpenTaskSettings] = useState(() => new Set());
  const [prerequisiteNoticeTaskIds, setPrerequisiteNoticeTaskIds] = useState(() => new Set());
  const prerequisiteNoticeTimeouts = useRef(new Map());
  const parentMap = useMemo(() => getTaskParentMap(data.tasks, data.relations), [data.tasks, data.relations]);

  function save(nextData) {
    context.setModuleData(toolboxId, moduleId, nextData, "taskPlanner");
  }
  const reorder = useTaskPlannerReorder({ data, parentMap, save });

  useEffect(() => {
    const intervalId = window.setInterval(() => setNowMs(Date.now()), 60000);
    return () => window.clearInterval(intervalId);
  }, []);

  useEffect(() => () => {
    prerequisiteNoticeTimeouts.current.forEach((timeoutId) => window.clearTimeout(timeoutId));
  }, []);

  useEffect(() => {
    const resetData = applyDueResets(data, nowMs);
    if (resetData !== data) save(resetData);
  });

  function addTask(event) {
    taskDraft.handleSubmit(event, (draft, { reset }) => {
      const cleanTitle = draft.title.trim();
      if (!cleanTitle) return;
      const category = draft.category.trim();
      const task = {
        id: context.uid("task"),
        title: cleanTitle,
        description: "",
        type: draft.type,
        checked: false,
        checkedAt: 0
      };
      if (category) task.category = category;
      save({
        ...data,
        tasks: [...data.tasks, task],
        categoryOrder: category && !data.categoryOrder.includes(category) ? [...data.categoryOrder, category] : data.categoryOrder
      });
      reset();
    });
  }

  function updateTask(taskId, updater) {
    save({ ...data, tasks: data.tasks.map((task) => task.id === taskId ? updater(task) : task) });
  }

  function deleteTask(taskId) {
    save({
      ...data,
      tasks: data.tasks.filter((task) => task.id !== taskId),
      relations: data.relations.filter((relation) => relation.fromTaskId !== taskId && relation.toTaskId !== taskId)
    });
  }

  function addLinkTarget(fromTaskId, toTaskId) {
    if (!toTaskId || fromTaskId === toTaskId || data.relations.some((relation) => relation.fromTaskId === fromTaskId && relation.toTaskId === toTaskId)) return;
    save({
      ...data,
      tasks: data.tasks.map((task) => {
        if (task.id !== fromTaskId || !task.category) return task;
        const nextTask = { ...task };
        delete nextTask.category;
        return nextTask;
      }),
      relations: [
        ...data.relations.filter((relation) => relation.fromTaskId !== fromTaskId),
        { id: context.uid("relation"), fromTaskId, toTaskId, prerequisite: false }
      ]
    });
  }

  function removeLinkTarget(fromTaskId, toTaskId) {
    save({
      ...data,
      relations: data.relations.filter((relation) => relation.fromTaskId !== fromTaskId || relation.toTaskId !== toTaskId)
    });
  }

  function setPrerequisite(fromTaskId, toTaskId, prerequisite) {
    const hasRelation = data.relations.some((relation) => relation.fromTaskId === fromTaskId && relation.toTaskId === toTaskId);
    save({
      ...data,
      relations: hasRelation
        ? data.relations.map((relation) => relation.fromTaskId === fromTaskId && relation.toTaskId === toTaskId ? { ...relation, prerequisite } : relation)
        : [...data.relations, { id: context.uid("relation"), fromTaskId, toTaskId, prerequisite }]
    });
  }

  function setTaskCategory(taskId, category) {
    const normalizedCategory = String(category || "").trim();
    const tasks = data.tasks.map((task) => {
      if (task.id !== taskId) return task;
      const nextTask = { ...task };
      if (normalizedCategory) nextTask.category = normalizedCategory;
      else delete nextTask.category;
      return nextTask;
    });
    const categoryOrder = [
      ...data.categoryOrder.filter((categoryName) => tasks.some((task) => task.category === categoryName)),
      ...tasks.map((task) => task.category).filter(Boolean).filter((categoryName) => !data.categoryOrder.includes(categoryName))
    ];
    save({ ...data, tasks, categoryOrder });
  }

  function toggleCategoryCollapsed(category) {
    const collapsedCategories = data.collapsedCategories.includes(category)
      ? data.collapsedCategories.filter((item) => item !== category)
      : [...data.collapsedCategories, category];
    save({ ...data, collapsedCategories });
  }

  function clearCompletedUniqueTasks() {
    const removedTaskIds = new Set(data.tasks.filter((task) => task.type === "unique" && task.checked).map((task) => task.id));
    if (!removedTaskIds.size) return;
    const tasks = data.tasks.filter((task) => !removedTaskIds.has(task.id));
    const relations = data.relations.filter((relation) => !removedTaskIds.has(relation.fromTaskId) && !removedTaskIds.has(relation.toTaskId));
    save({ ...data, tasks, relations });
  }

  function toggleSet(setter, taskId) {
    setter((current) => {
      const next = new Set(current);
      if (next.has(taskId)) next.delete(taskId);
      else next.add(taskId);
      return next;
    });
  }

  function showPrerequisiteNotice(taskId) {
    const currentTimeoutId = prerequisiteNoticeTimeouts.current.get(taskId);
    if (currentTimeoutId) window.clearTimeout(currentTimeoutId);
    setPrerequisiteNoticeTaskIds((current) => new Set(current).add(taskId));
    const timeoutId = window.setTimeout(() => {
      prerequisiteNoticeTimeouts.current.delete(taskId);
      setPrerequisiteNoticeTaskIds((current) => {
        const next = new Set(current);
        next.delete(taskId);
        return next;
      });
    }, 2600);
    prerequisiteNoticeTimeouts.current.set(taskId, timeoutId);
  }

  return (
    <div className="task-planner-module">
      <TaskPlannerTopbar
        data={data}
        context={context}
        editing={editing}
        settingsOpen={settingsOpen}
        categoryOptions={categoryOptions}
        taskDraft={taskDraft}
        textContent={textContent}
        textExchangeOpen={textExchangeOpen}
        onAddTask={addTask}
        onHideCompletedToggle={() => save({ ...data, hideCompleted: !data.hideCompleted })}
        onSettingsToggle={() => setSettingsOpen((value) => !value)}
        onImport={(nextData) => save(nextData)}
      />

      {settingsOpen && (
        <TaskPlannerSettings
          data={data}
          textContent={textContent}
          onWeeklyResetDayChange={(weeklyResetDay) => save({ ...data, weeklyResetDay })}
          onResetTimeChange={(resetTime) => save({ ...data, resetTime })}
          onClearCompletedUniqueTasks={clearCompletedUniqueTasks}
        />
      )}

      <ul className="task-planner-list">
        {data.tasks.length ? (
          <TaskPlannerBranch
            parentId=""
            parentMap={parentMap}
            tasks={data.tasks}
            data={data}
            nowMs={nowMs}
            reorder={reorder}
            textContent={textContent}
            openDescriptions={openDescriptions}
            openTaskSettings={openTaskSettings}
            prerequisiteNoticeTaskIds={prerequisiteNoticeTaskIds}
            onToggleDescription={(taskId) => toggleSet(setOpenDescriptions, taskId)}
            onToggleSettings={(taskId) => toggleSet(setOpenTaskSettings, taskId)}
            onPrerequisiteNotice={showPrerequisiteNotice}
            onUpdateTask={updateTask}
            onDeleteTask={deleteTask}
            onAddLinkTarget={addLinkTarget}
            onRemoveLinkTarget={removeLinkTarget}
            onSetPrerequisite={setPrerequisite}
            onSetTaskCategory={setTaskCategory}
            onToggleCategoryCollapsed={toggleCategoryCollapsed}
          />
        ) : (
          <li className="task-planner-empty">{textContent.emptyTasks || "Aucune tâche planifiée."}</li>
        )}
      </ul>
    </div>
  );
}