// struct-activity.mjs
import { logger } from '../utils/logger.mjs';

let clubSchema = {
    academicYear: null,
    category: null,
    description: null,
    duration: {
        endDate: null,
        isRecurringWeekly: null,
        startDate: null
    },
    grades: {
        max: null,
        min: null
    },
    id: null,
    isPreSignup: null,
    isStudentLed: null,
    materials: [],
    meeting: {
        day: null,
        endTime: null,
        location: {
            block: null,
            room: null,
            site: null
        },
        startTime: null
    },
    name: null,
    photo: null,
    poorWeatherPlan: null,
    requirements: [],
    schedule: null,
    semesterCost: null,
    staff: [],
    staffForReports: [],
    studentLeaders: []
}

async function applyFields(field, structuredActivityData) {
    switch (true) {
        case field.fID == "academicyear":
            structuredActivityData.academicYear = field.fData;
            break;
        case field.fID == "schedule":
            structuredActivityData.schedule = field.fData;
            break;
        case field.fID == "category":
            structuredActivityData.category = field.fData;
            break;
        case field.fID == "activityname":
            structuredActivityData.name = field.fData;
            break;
        case field.fID == "day":
            structuredActivityData.meeting.day = field.fData;
            break;
        case field.fID == "start":
            structuredActivityData.meeting.startTime = field.fData;
            break;
        case field.fID == "end":
            structuredActivityData.meeting.endTime = field.fData;
            break;
        case field.fID == "site":
            structuredActivityData.meeting.location.site = field.fData;
            break;
        case field.fID == "block":
            structuredActivityData.meeting.location.block = field.fData;
            break;
        case field.fID == "room":
            structuredActivityData.meeting.location.room = field.fData;
            break;
        case field.fID == "staff":
            let staff = field.fData.split(", ");
            structuredActivityData.staff = staff;
            break;
        case field.fID == "runsfrom":
            structuredActivityData.duration.startDate = field.fData;
            break;
        case field.fID == "runsto":
            structuredActivityData.duration.endDate = field.fData;
            break;
        case field.fData == "Recurring Weekly":
            structuredActivityData.duration.isRecurringWeekly = true;
            break;
        default:
            logger.debug(`No matching case for field: fID=${field.fID}, fType=${field.fType}`);
            break;
    }
}

async function postProcess(structuredActivityData) {
    structuredActivityData.description = structuredActivityData.description.replaceAll("<br/>","\n");
    structuredActivityData.description = structuredActivityData.description.replaceAll("\u000B","\v");
    if (structuredActivityData.name.search("Student-led") != -1 ||
          structuredActivityData.name.search("学生社团") != -1 ||
          structuredActivityData.name.search("(SL)") != -1) {
        structuredActivityData.isStudentLed = true;
    } else {
        structuredActivityData.isStudentLed = false;
    }
    try {
        let grades = structuredActivityData.schedule.match(/G(\d+)-(\d+)/) || 
                    structuredActivityData.schedule.match(/KG(\d+)-KG(\d+)/);
        
        if (!grades || grades.length < 3) {
            throw new Error('Invalid grade format in schedule');
        }
        structuredActivityData.grades.min = grades[1];
        structuredActivityData.grades.max = grades[2];
    } catch (error) {
        logger.error(`Failed to parse grades: ${error.message}`);
        structuredActivityData.grades.min = null;
        structuredActivityData.grades.max = null;
    }
}

export async function structActivityData(rawActivityData) {
    let structuredActivityData = JSON.parse(JSON.stringify(clubSchema));
    let rows = rawActivityData.newRows;
    // Load club id - "rID": "3350:1:0:0"
    structuredActivityData.id = rows[0].rID.split(":")[0];
    for (const rowObject of rows) {
        for (let i = 0; i < rowObject.fields.length; i++) {
            const field = rowObject.fields[i];
            // Optimize: no fData, just skip
            if (!field.fData) { continue; }
            // Process hard cases first
            if (field.fData == "Description") {
                if (i + 1 < rowObject.fields.length) {
                    structuredActivityData.description = rowObject.fields[i + 1].fData;
                }
                continue;
            } else if (field.fData == "Name To Appear On Reports") {
                if (i + 1 < rowObject.fields.length) {
                    let staffForReports = rowObject.fields[i + 1].fData.split(", ");
                    structuredActivityData.staffForReports = staffForReports;
                }
            } else if (field.fData == "Upload Photo") {
                if (i + 1 < rowObject.fields.length) {
                    structuredActivityData.photo = rowObject.fields[i + 1].fData;
                }
            } else if (field.fData == "Poor Weather Plan") {
                if (i + 1 < rowObject.fields.length) {
                    structuredActivityData.poorWeatherPlan = rowObject.fields[i + 1].fData;
                }
            } else if (field.fData == "Activity Runs From") {
                if (i + 4 < rowObject.fields.length) {
                    structuredActivityData.duration.isRecurringWeekly = 
                        rowObject.fields[i + 4].fData == "Recurring Weekly";
                }
            } else if (field.fData == "Is Pre Sign-up") {
                if (i + 1 < rowObject.fields.length) {
                    structuredActivityData.isPreSignup = rowObject.fields[i + 1].fData !== "";
                }
            } else if (field.fData == "Semester Cost") {
                if (i + 1 < rowObject.fields.length) {
                    structuredActivityData.semesterCost = 
                        rowObject.fields[i + 1].fData === "" ? null : rowObject.fields[i + 1].fData;
                }
            } else {
                // Pass any other easy cases to helper function
                applyFields(field, structuredActivityData);
            }
        }
    }
    postProcess(structuredActivityData);
    return structuredActivityData
}