/**
 * TasGrid SDK
 * 
 * A headless utility for creating tasks in the TasGrid PocketBase database
 * from sister applications, ensuring all TasGrid defaults and date calculations
 * are applied consistently.
 */

const URGENCY_HOURS = {
    10: 12,
    9: 24,
    8: 36,
    7: 72,
    6: 120,
    5: 240,
    4: 504,
    3: 1080,
    2: 2160,
    1: 4320
};

/**
 * Calculates a future ISO date string based on the TasGrid urgency decay algorithm.
 * @param {number} level Urgency level (1-10)
 * @returns {string} ISO Date string
 */
export const calculateDateFromUrgency = (level) => {
    const roundedLevel = Math.max(1, Math.min(10, Math.round(level)));
    const hours = URGENCY_HOURS[roundedLevel] || 24;
    return new Date(Date.now() + hours * 60 * 60 * 1000).toISOString();
};

/**
 * Creates a new task in the TasGrid database using the provided PocketBase instance.
 * 
 * @param {object} pb - An authenticated PocketBase JS SDK instance.
 * @param {object} payload - The task payload.
 * @param {string} [payload.title="New Task"] - The task title.
 * @param {string} [payload.owner] - PocketBase User ID. Defaults to pb.authStore.model.id.
 * @param {number} [payload.priority=5] - Priority (1-10).
 * @param {number} [payload.urgency=5] - Urgency (1-10). Used to calculate dueDate if omitted.
 * @param {number} [payload.size=3] - Size (0-10).
 * @param {number} [payload.status=0] - Status (0-10).
 * @param {boolean} [payload.completed=false] - Completion status.
 * @param {string[]} [payload.tags=[]] - Array of tag strings.
 * @param {string} [payload.content=""] - HTML string for task description/notes.
 * @param {string} [payload.dueDate] - Strict ISO Date string. Overrides urgency calculation.
 * @param {string} [payload.startDate=""] - ISO Date string.
 * @returns {Promise<object>} The created PocketBase task record.
 */
export const createTasgridTask = async (pb, payload = {}) => {
    if (!pb || !pb.authStore || !pb.authStore.isValid || !pb.authStore.model) {
        throw new Error("Invalid or unauthenticated PocketBase instance provided.");
    }

    const urgencyVal = payload.urgency ?? 5;

    const taskData = {
        title: payload.title || "New Task",
        priority: payload.priority ?? 5,
        size: payload.size ?? 3,
        status: payload.status ?? 0,
        completed: payload.completed ?? false,
        tags: payload.tags || [],
        content: payload.content || "",
        user: payload.owner || pb.authStore.model.id,
        dueDate: payload.dueDate || calculateDateFromUrgency(urgencyVal),
        startDate: payload.startDate || "",
    };

    try {
        const record = await pb.collection('TasGrid').create(taskData);
        return record;
    } catch (err) {
        console.error("TasGrid SDK: Failed to create task", err);
        throw err;
    }
};

/**
 * Creates a new note in the TasGrid database using the provided PocketBase instance.
 * 
 * @param {object} pb - An authenticated PocketBase JS SDK instance.
 * @param {object} payload - The note payload.
 * @param {string} [payload.title="New Note"] - The note title.
 * @param {string} [payload.content=""] - HTML string for note content.
 * @param {string[]} [payload.tags=[]] - Array of tag strings.
 * @param {boolean} [payload.isPrivate=false] - Whether the note is private.
 * @param {string[]} [payload.tasks=[]] - Array of task IDs to link.
 * @param {string} [payload.owner] - PocketBase User ID. Defaults to pb.authStore.model.id.
 * @returns {Promise<object>} The created PocketBase note record.
 */
export const createTasgridNote = async (pb, payload = {}) => {
    if (!pb || !pb.authStore || !pb.authStore.isValid || !pb.authStore.model) {
        throw new Error("Invalid or unauthenticated PocketBase instance provided.");
    }

    const noteData = {
        title: payload.title || "New Note",
        content: payload.content || "",
        tags: payload.tags || [],
        isPrivate: payload.isPrivate || false,
        tasks: payload.tasks || [],
        user: payload.owner || pb.authStore.model.id,
    };

    try {
        const record = await pb.collection('TasGrid_Notes').create(noteData);
        return record;
    } catch (err) {
        console.error("TasGrid SDK: Failed to create note", err);
        throw err;
    }
};