export const APPEAL_TYPES = {
    SIPS: 846040002,
    DNS: 846040011,
    HOUSEHOLDER: 846040004,
    ADVERT: 846040018,
    EXCLUDE_QUESTIONNAIRE_1: 846040019,
    EXCLUDE_QUESTIONNAIRE_2: 846040015,
    EXCLUDE_QUESTIONNAIRE_3: 846040016
};

export const SPECIALIST_PROCESS = {
    WRITTEN_REPS: 846040000,
    HEARING: 846040001
};

export const INVOLVEMENT_TYPES = {
    LPA: 846040012
};

export const REPRESENTATION_OPTIONS = {
    QUESTIONNAIRE: "Questionnaire",
    STATEMENT: "Statement",
    FINAL_COMMENTS: "Final comments",
    CONSULTATION_RESPONSE: "Consultation Response",
    LOCAL_IMPACT_REPORT: "Local Impact Report",
    MARINE_IMPACT_REPORT: "Marine Impact Report"
};

const isValidDate = (date) =>
    date instanceof Date && !Number.isNaN(date.getTime());

const toDateOrNull = (value) => {
    const date = new Date(value);
    return isValidDate(date) ? date : null;
};

const endOfDay = (date) => {
    if (!isValidDate(date)) return null;
    const next = new Date(date);
    next.setHours(23, 59, 59, 999);
    return next;
};

const isWithinWindow = (now, start, end) => {
    if (!isValidDate(now) || !isValidDate(start) || !isValidDate(end)) {
        return false;
    }
    return now >= start && now <= end;
};

const normalizeCapacity = (value) =>
    (value || "")
        .toString()
        .toLowerCase()
        .replace(/(\band|[\s\-\+\(\)\,\&])/g, "");

export const buildRepresentationContext = ({
    detailsObj = {},
    appealType,
    specialistProcess,
    involvementType,
    selectedCapacity,
    isCaseOwner,
    isNRW,
    now = new Date()
}) => {
    const isDNS = appealType === APPEAL_TYPES.DNS;

    const startDate = toDateOrNull(
        isDNS
            ? detailsObj.pinswg_applicationacceptedasvalid
            : detailsObj.pinswg_startdate || detailsObj.pinswg_startdates
    );

    const statementDueDate = endOfDay(
        toDateOrNull(
            isDNS
                ? detailsObj.pinswg_endofrepresentationperiod
                : detailsObj.pinswg_statementduedate ||
                      detailsObj.pinswg_statementsduedate
        )
    );

    const finalCommentsDueDate = endOfDay(
        toDateOrNull(
            isDNS
                ? detailsObj.pinswg_endofrepresentationperiod
                : detailsObj.pinswg_finalcommentsduedate
        )
    );

    const capacity = normalizeCapacity(selectedCapacity);
    const isLPA = involvementType === INVOLVEMENT_TYPES.LPA;

    return {
        appealType,
        specialistProcess,
        isDNS,
        isSIPS: appealType === APPEAL_TYPES.SIPS,
        isLPA,
        isNRW: !!isNRW,
        isCaseOwner: !!isCaseOwner,
        isSelectedAppellant: capacity === "appellant",
        isSelectedAgent: capacity === "agent",
        isSelectedInterestedParty: capacity === "interestedparty",
        now,
        startDate,
        statementDueDate,
        finalCommentsDueDate
    };
};

export const addQuestionnaire = (options, ctx) => {
    const excludedTypes = [
        APPEAL_TYPES.EXCLUDE_QUESTIONNAIRE_1,
        APPEAL_TYPES.DNS,
        APPEAL_TYPES.EXCLUDE_QUESTIONNAIRE_2,
        APPEAL_TYPES.EXCLUDE_QUESTIONNAIRE_3
    ];

    const canAdd =
        ctx.isLPA &&
        !excludedTypes.includes(ctx.appealType) &&
        isWithinWindow(ctx.now, ctx.startDate, ctx.finalCommentsDueDate);

    if (canAdd) {
        options.add(REPRESENTATION_OPTIONS.QUESTIONNAIRE);
    }
};

export const addStatements = (options, ctx) => {
    const isLpaAdvertPart3NoStatement =
        ctx.isLPA &&
        ctx.appealType === APPEAL_TYPES.ADVERT &&
        ctx.specialistProcess === SPECIALIST_PROCESS.WRITTEN_REPS;

    const canAddDnsLpaDocs =
        ctx.isLPA &&
        ctx.isDNS &&
        ctx.appealType !== APPEAL_TYPES.EXCLUDE_QUESTIONNAIRE_1 &&
        !ctx.isCaseOwner &&
        isWithinWindow(ctx.now, ctx.startDate, ctx.finalCommentsDueDate);

    if (canAddDnsLpaDocs) {
        options.add(REPRESENTATION_OPTIONS.LOCAL_IMPACT_REPORT);
        options.add(REPRESENTATION_OPTIONS.STATEMENT);
    }

    const canAddStatementForNonDns =
        !ctx.isDNS &&
        ctx.appealType !== APPEAL_TYPES.HOUSEHOLDER &&
        !isLpaAdvertPart3NoStatement &&
        !ctx.isCaseOwner &&
        isWithinWindow(ctx.now, ctx.startDate, ctx.statementDueDate);

    if (canAddStatementForNonDns) {
        options.add(REPRESENTATION_OPTIONS.STATEMENT);
    }

    const canAddStatementForDnsNonLpa =
        ctx.isDNS &&
        !ctx.isLPA &&
        !ctx.isCaseOwner &&
        isWithinWindow(ctx.now, ctx.startDate, ctx.statementDueDate);

    if (canAddStatementForDnsNonLpa) {
        options.add(REPRESENTATION_OPTIONS.STATEMENT);
    }
};

export const addFinalComments = (options, ctx) => {
    const canSubmitFinalCommentsDefault =
        ctx.isSelectedAppellant ||
        ctx.isSelectedAgent ||
        ctx.isSelectedInterestedParty ||
        ctx.isLPA;

    const canSubmitFinalComments = ctx.isDNS
        ? ctx.isLPA
        : canSubmitFinalCommentsDefault;

    const isSpecialistNonHearing =
        ctx.specialistProcess !== SPECIALIST_PROCESS.HEARING;

    const finalCommentsWindowStart = ctx.isDNS
        ? ctx.startDate
        : ctx.statementDueDate;

    const canAdd =
        canSubmitFinalComments &&
        isWithinWindow(
            ctx.now,
            finalCommentsWindowStart,
            ctx.finalCommentsDueDate
        ) &&
        (ctx.appealType !== APPEAL_TYPES.HOUSEHOLDER || isSpecialistNonHearing);

    if (canAdd) {
        options.add(REPRESENTATION_OPTIONS.FINAL_COMMENTS);
    }
};

export const addConsultation = (options, ctx) => {
    if (!ctx.isSIPS) return;

    options.add(REPRESENTATION_OPTIONS.CONSULTATION_RESPONSE);

    if (!ctx.isSelectedAppellant) {
        options.add(REPRESENTATION_OPTIONS.LOCAL_IMPACT_REPORT);
    }

    if (ctx.isNRW) {
        options.add(REPRESENTATION_OPTIONS.MARINE_IMPACT_REPORT);
    }
};

export const buildRepsArrFromContext = (ctx) => {
    const options = new Set();
    addQuestionnaire(options, ctx);
    addStatements(options, ctx);
    addFinalComments(options, ctx);
    addConsultation(options, ctx);
    return [...options];
};