<script setup>
import { ref, computed, watch, nextTick, onMounted, onUnmounted } from "vue";
import Button from "@/components/input/Button.vue";
import { useMessagesStore } from "@/stores/messages";
import { useAuthStore } from "@/stores/auth";
import Header from "@/components/text/Header.vue";
import Link from "@/components/text/Link.vue";

const messagesStore = useMessagesStore();
const authStore = useAuthStore();
const messages = computed(() => messagesStore.messages);
const messageInput = ref("");
const messagesContainer = ref(null);
const fileInput = ref(null);

function scrollToBottom() {
  nextTick(() => {
    if (messagesContainer.value) {
      messagesContainer.value.scrollTop = messagesContainer.value.scrollHeight;
    }
  });
}

watch(messages, scrollToBottom, { deep: true });

function sendMessage() {
  const text = messageInput.value.trim();
  if (!text) return;
  messagesStore.sendMessage(text);
  messageInput.value = "";
}

async function onFileSelected(e) {
  const file = e.target.files[0];
  if (!file) return;
  await messagesStore.uploadAndSendFile(file);
  fileInput.value.value = "";
}

function isImageUrl(url) {
  return /\.(jpg|jpeg|png|gif|webp)$/i.test(url);
}

function isVideoUrl(url) {
  return /\.(mp4|webm|ogg|mov)$/i.test(url);
}

function isSafeFileUrl(url) {
  return typeof url === "string" && url.startsWith("/uploads/");
}

const urlRegex = /(https?:\/\/[^\s<]+)/g;

function parseMessageParts(text) {
  const parts = [];
  let lastIndex = 0;
  let match;
  while ((match = urlRegex.exec(text)) !== null) {
    if (match.index > lastIndex) {
      parts.push({
        type: "text",
        value: text.slice(lastIndex, match.index),
      });
    }
    parts.push({ type: "link", value: match[1] });
    lastIndex = urlRegex.lastIndex;
  }
  if (lastIndex < text.length) {
    parts.push({ type: "text", value: text.slice(lastIndex) });
  }
  return parts;
}

onMounted(() => {
  messagesStore.connect();
});
onUnmounted(() => {
  messagesStore.disconnect();
});
</script>

<template>
  <div class="chat-root flex-col flex min-h-0">
    <Header>Chat</Header>
    <div ref="messagesContainer" class="flex flex-col flex-1 min-h-0 overflow-y-auto overflow-x-hidden p-2 min-w-0">
      <p v-for="message in messages" :key="message.id" class="break-words min-w-0 w-full">
        <span class="text-tertiary">{{ message.authorId }}:</span>
        <template
          v-for="(part, i) in parseMessageParts(message.text || '')"
          :key="i"
        >
          <Link
            v-if="part.type === 'link'"
            bare
            :href="part.value"
            target="_blank"
            class="text-primary underline break-all"
            >{{ part.value }}</Link
          >
          <span v-else>{{ part.value }}</span>
        </template>
        <template v-if="message.fileUrl && isSafeFileUrl(message.fileUrl)">
          <img
            v-if="isImageUrl(message.fileUrl)"
            :src="message.fileUrl"
            class="w-full max-w-full max-h-48 rounded block"
            @load="scrollToBottom"
          />
          <video
            v-else-if="isVideoUrl(message.fileUrl)"
            :src="message.fileUrl"
            controls
            class="w-full max-w-full max-h-48 rounded block"
            @loadedmetadata="scrollToBottom"
          />
          <Link v-else bare :href="message.fileUrl" target="_blank" class="underline break-all">{{
            message.fileUrl.split("/").pop()
          }}</Link>
        </template>
      </p>
    </div>
    <div>
      <input v-model="messageInput" @keyup.enter="sendMessage" />
      <input
        ref="fileInput"
        type="file"
        class="hidden"
        @change="onFileSelected"
      />
      <div class="flex gap-2">
        <Button class="flex-1" @click="sendMessage">Send</Button>
        <Button
          v-if="authStore.user.admin"
          class="flex-1"
          @click="fileInput.click()"
          >Attach</Button
        >
        <Button class="flex-1" @click="scrollToBottom">Bottom</Button>
      </div>
    </div>
  </div>
</template>

<style scoped>
@media (max-width: 850px) {
    .chat-root {
        max-height: 400px;
    }
}
</style>
