import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/db';
import { auth } from '@/lib/auth';
import { validateOptionalUrl } from '@/lib/validation';

type RouteParams = { params: Promise<{ versionId: string }> };

// GET /api/versions/[versionId]/comments
export async function GET(request: NextRequest, { params }: RouteParams) {
    try {
        const session = await auth();
        const { versionId } = await params;

        // Get version with project access info
        const version = await db.videoVersion.findUnique({
            where: { id: versionId },
            include: {
                video: {
                    include: {
                        project: {
                            include: {
                                members: { where: { userId: session?.user?.id || '' } },
                            },
                        },
                    },
                },
            },
        });

        if (!version) {
            return NextResponse.json({ error: 'Version not found' }, { status: 404 });
        }

        const project = version.video.project;
        const isOwner = session?.user?.id === project.ownerId;
        const isMember = project.members.length > 0;
        const isPublic = project.visibility === 'PUBLIC';

        if (!isOwner && !isMember && !isPublic) {
            return NextResponse.json({ error: 'Access denied' }, { status: 403 });
        }

        const { searchParams } = new URL(request.url);
        const includeResolved = searchParams.get('includeResolved') !== 'false';

        const comments = await db.comment.findMany({
            where: {
                versionId,
                parentId: null, // Only top-level comments
                ...(includeResolved ? {} : { isResolved: false }),
            },
            orderBy: { timestamp: 'asc' },
            include: {
                author: { select: { id: true, name: true, image: true } },
                replies: {
                    orderBy: { createdAt: 'asc' },
                    include: {
                        author: { select: { id: true, name: true, image: true } },
                    },
                },
            },
        });

        return NextResponse.json({ comments });
    } catch (error) {
        console.error('Error fetching comments:', error);
        return NextResponse.json(
            { error: 'Failed to fetch comments' },
            { status: 500 }
        );
    }
}

// POST /api/versions/[versionId]/comments
export async function POST(request: NextRequest, { params }: RouteParams) {
    try {
        const session = await auth();
        const { versionId } = await params;

        const version = await db.videoVersion.findUnique({
            where: { id: versionId },
            include: {
                video: {
                    include: {
                        project: {
                            include: {
                                members: { where: { userId: session?.user?.id || '' } },
                                shareLinks: { where: { permission: 'COMMENT' } },
                            },
                        },
                    },
                },
            },
        });

        if (!version) {
            return NextResponse.json({ error: 'Version not found' }, { status: 404 });
        }

        const project = version.video.project;
        const isOwner = session?.user?.id === project.ownerId;
        const isMember = project.members.length > 0;
        const hasCommentLink = project.shareLinks.length > 0;
        const isPublic = project.visibility === 'PUBLIC';

        // Check if user can comment
        const canComment = isOwner || isMember || isPublic || hasCommentLink;
        if (!canComment) {
            return NextResponse.json({ error: 'Access denied' }, { status: 403 });
        }

        const body = await request.json();
        const { content, timestamp, timestampEnd, parentId, voiceUrl, voiceDuration, guestName, guestEmail } = body;

        // Validate required fields
        if (timestamp === undefined || timestamp === null) {
            return NextResponse.json(
                { error: 'Timestamp is required' },
                { status: 400 }
            );
        }

        if (!content && !voiceUrl) {
            return NextResponse.json(
                { error: 'Either content or voice recording is required' },
                { status: 400 }
            );
        }

        // If replying, verify parent exists in same version
        if (parentId) {
            const parent = await db.comment.findFirst({
                where: { id: parentId, versionId },
            });
            if (!parent) {
                return NextResponse.json(
                    { error: 'Parent comment not found' },
                    { status: 400 }
                );
            }
        }

        // Guest comment validation
        const isGuest = !session?.user?.id;
        if (isGuest && !guestName) {
            return NextResponse.json(
                { error: 'Guest name is required for guest comments' },
                { status: 400 }
            );
        }

        // Validate voice URL uses safe scheme
        const voiceUrlError = validateOptionalUrl(voiceUrl, 'Voice URL');
        if (voiceUrlError) {
            return NextResponse.json({ error: voiceUrlError }, { status: 400 });
        }

        const comment = await db.comment.create({
            data: {
                content: content?.trim() || null,
                timestamp: parseFloat(timestamp),
                timestampEnd: timestampEnd ? parseFloat(timestampEnd) : null,
                parentId: parentId || null,
                voiceUrl: voiceUrl || null,
                voiceDuration: voiceDuration || null,
                authorId: session?.user?.id || null,
                guestName: isGuest ? guestName : null,
                guestEmail: isGuest ? guestEmail : null,
                versionId,
            },
            include: {
                author: { select: { id: true, name: true, image: true } },
                replies: {
                    include: {
                        author: { select: { id: true, name: true, image: true } },
                    },
                },
            },
        });

        return NextResponse.json(comment, { status: 201 });
    } catch (error) {
        console.error('Error creating comment:', error);
        return NextResponse.json(
            { error: 'Failed to create comment' },
            { status: 500 }
        );
    }
}