export const MessageHistory = {
    name: 'MessageHistory',
    props: {
        messages: {
            type: Array,
            required: true,
            default: () => []
        },
        isTyping: {
            type: Boolean,
            default: false
        },
        isSubmittingForm: {
            type: Boolean,
            default: false
            },
            apiPrefix: {
                type: String,
                default: ''
        },
        autoScroll: {
            type: Boolean,
            default: true
        }
    },
    emits: ['submit-form', 'load-more', 'specialist-complete', 'specialist-error'],
    data() {
        return {
            isAtBottom: true,
            unreadCount: 0
        };
    },
    mounted() {
        this.scrollToBottom();
        this.setupScrollListener();
    },
    updated() {
        if (this.autoScroll && this.isAtBottom) {
            this.$nextTick(() => this.scrollToBottom());
        }
    },
    methods: {
        scrollToBottom() {
            const container = this.$refs.messagesContainer;
            if (container) {
                container.scrollTop = container.scrollHeight;
                this.isAtBottom = true;
                this.showScrollButton = false;
                this.unreadCount = 0;
            }
        },

        setupScrollListener() {
            const container = this.$refs.messagesContainer;
            if (!container) return;

            container.addEventListener('scroll', this.handleScroll);
        },

        handleScroll() {
            const container = this.$refs.messagesContainer;
            if (!container) return;

            const threshold = 100; // pixels from bottom
            const isNearBottom = container.scrollHeight - container.scrollTop - container.clientHeight < threshold;

            this.isAtBottom = isNearBottom;

            // Load more messages when scrolled to top
            if (container.scrollTop === 0) {
                this.$emit('load-more');
            }
        },


        handleImageLoaded() {
            // Auto-scroll when images load to maintain position
            if (this.isAtBottom) {
                this.$nextTick(() => this.scrollToBottom());
            }
        },

        searchMessages(query) {
            // Simple message search
            if (!query.trim()) return this.messages;

            const searchTerm = query.toLowerCase();
            return this.messages.filter(message =>
                message.content &&
                message.content.toLowerCase().includes(searchTerm)
            );
        },

    },
    beforeUnmount() {
        // Cleanup scroll listener
        const container = this.$refs.messagesContainer;
        if (container) {
            container.removeEventListener('scroll', this.handleScroll);
        }
    },
    template: `
        <div class="message-history-container">
            <!-- Messages container -->
            <div class="chat-messages" ref="messagesContainer">
                <!-- Loading indicator for load more -->
                <div v-if="$slots.loading" class="load-more-indicator">
                    <slot name="loading"></slot>
                </div>
                
                <!-- Empty state -->
                <div v-if="messages.length === 0" class="empty-state">
                    <div class="empty-icon">💬</div>
                    <div class="empty-text">Nog geen berichten</div>
                    <div class="empty-subtext">Start een gesprek door een bericht te typen!</div>
                </div>
                
                <!-- Message list -->
                <template v-else>
                    <!-- Messages -->
                    <template v-for="(message, index) in messages" :key="message.id">
                        <!-- The actual message -->
                        <chat-message
                            :message="message"
                            :is-submitting-form="isSubmittingForm"
                            :api-prefix="apiPrefix"
                            @image-loaded="handleImageLoaded"
                            @specialist-complete="$emit('specialist-complete', $event)"
                            @specialist-error="$emit('specialist-error', $event)"
                        ></chat-message>
                    </template>
                </template>
                
                <!-- Typing indicator -->
                <typing-indicator v-if="isTyping"></typing-indicator>
            </div>
        </div>
    `,
};