import FormContainer from "@/components/FormContainer";
import Table from "@/components/Table";
import { getSupabaseClient } from "@/lib/supabase";
import { Tables } from "@/types/supabase";
import { auth } from "@clerk/nextjs/server";
import { notFound } from "next/navigation";
import GenerateLessonsForm from "@/components/forms/GenerateLessonsForm";

type EntryList = Tables<"TeacherTimetableEntry"> & {
    class: Tables<"Class"> | null;
    subject: Tables<"Subject"> | null;
    slot: Tables<"SchoolTimetableSlot"> | null;
};

const SingleTemplatePage = async ({
    params: { id },
}: {
    params: { id: string };
}) => {
    const { sessionClaims, userId } = auth();
    const role = (sessionClaims?.metadata as { role?: string })?.role;
    const schoolId = (sessionClaims?.metadata as { schoolId?: string })?.schoolId;
    const teacherType = (sessionClaims?.metadata as { teacherType?: string })?.teacherType;

    const canManageSchool =
        role === "admin" ||
        (role === "teacher" && (teacherType === "INDEPENDENT" || teacherType === "AGENCY"));
    const isTemplateOwner = (tid: string) => tid === userId;

    const supabase = await getSupabaseClient();

    // Fetch the template
    const { data: template, error: templateError } = await supabase
        .from("TeacherTimetableTemplate")
        .select("*, teacher:Teacher(*)")
        .eq("id", parseInt(id))
        .single();

    if (templateError || !template) {
        return notFound();
    }

    // Ensure it belongs to the current school
    if (schoolId && template.schoolId !== schoolId) {
        return notFound();
    }

    // Fetch the entries
    const { data: rawEntries } = await supabase
        .from("TeacherTimetableEntry")
        .select("*, class:Class(*), subject:Subject(*), slot:SchoolTimetableSlot(*)")
        .eq("teacherTimetableTemplateId", template.id)
        .order("dayOfWeek", { ascending: true });

    const entries = (rawEntries || []) as unknown as EntryList[];

    // Sort entries by day then by slot position
    entries.sort((a, b) => {
        if (a.dayOfWeek !== b.dayOfWeek) return a.dayOfWeek - b.dayOfWeek;
        const posA = (a.slot as { position?: number })?.position ?? 0;
        const posB = (b.slot as { position?: number })?.position ?? 0;
        return posA - posB;
    });

    const schoolForTerms = schoolId || template.schoolId;
    const terms = schoolForTerms
        ? (await supabase
            .from("Term")
            .select("id, name, startDate, endDate")
            .eq("schoolId", schoolForTerms)
            .order("startDate", { ascending: true })).data ?? []
        : [];

    const columns = [
        { header: "Day", accessor: "dayOfWeek" },
        { header: "Time Slot", accessor: "slot" },
        { header: "Class", accessor: "class", className: "hidden md:table-cell" },
        { header: "Subject", accessor: "subject", className: "hidden md:table-cell" },
        ...(role === "admin"
            ? [{ header: "Actions", accessor: "action" }]
            : []),
    ];

    const getDayName = (day: number) => {
        const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
        // JS days: 0 = Sunday, 1 = Monday. We'll map assuming 1 = Monday like our form (1-7).
        if (day >= 1 && day <= 7) {
            // Just map standard ISO 1=Monday... 7=Sunday
            const isoDays = ["", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];
            return isoDays[day];
        }
        return "Unknown";
    }

    const renderRow = (item: EntryList) => (
        <tr
            key={item.id}
            className="border-b border-gray-200 even:bg-slate-50 text-sm hover:bg-lamaPurpleLight"
        >
            <td className="p-4">{getDayName(item.dayOfWeek)}</td>
            <td>
                {item.slot ? `${item.slot.name} (${item.slot.startTime}-${item.slot.endTime})` : "-"}
            </td>
            <td className="hidden md:table-cell">{item.class?.name || "-"}</td>
            <td className="hidden md:table-cell">{item.subject?.name || "-"}</td>
            <td>
                <div className="flex items-center gap-2">
                    {role === "admin" && (
                        <>
                            <FormContainer
                                table="timetableEntry"
                                type="update"
                                data={item}
                            />
                            <FormContainer
                                table="timetableEntry"
                                type="delete"
                                id={item.id}
                            />
                        </>
                    )}
                </div>
            </td>
        </tr>
    );

    return (
        <div className="flex-1 p-4 flex flex-col gap-4 xl:flex-row">
            {/* LEFT */}
            <div className="w-full xl:w-2/3 flex flex-col gap-8">

                {/* TOP INFO */}
                <div className="bg-lamaSky rounded-md p-4 flex gap-4">
                    <div className="w-2/3 flex flex-col justify-between gap-4">
                        <h1 className="text-xl font-semibold">{template.name}</h1>
                        <p className="text-sm text-gray-500">
                            Teacher Owner: {template.teacher ? `${template.teacher.name} ${template.teacher.surname}` : "Unknown"}
                        </p>
                    </div>
                </div>

                {/* GENERATE LESSONS: template owner or admin; use template.schoolId when session school not set (e.g. admin) */}
                {canManageSchool && (role === "admin" || isTemplateOwner(template.teacherId)) && (schoolId || template.schoolId) && (
                    <GenerateLessonsForm
                        templateId={template.id}
                        schoolId={schoolId || template.schoolId}
                        terms={terms}
                    />
                )}

                {/* ENTRIES LIST */}
                <div className="bg-white rounded-md p-4">
                    <div className="flex justify-between items-center mb-4">
                        <h2 className="text-lg font-semibold">Timetable Entries</h2>
                        {role === "admin" && (
                            <FormContainer
                                table="timetableEntry"
                                type="create"
                                // Pre-fill the template ID
                                data={{ timetableTemplateId: template.id, teacherTimetableTemplateId: template.id }}
                            />
                        )}
                    </div>
                    <Table columns={columns} renderRow={renderRow} data={entries} />
                </div>
            </div>
        </div>
    );
};

export default SingleTemplatePage;