-- messages.lua - Messages app functionality
-- Handles conversation list and individual chats

local messages_doc = nil
local conversations = {}
local current_conversation = nil
local current_messages = {}

-- Avatar colors
local avatar_colors = {
    "#E91E63", "#9C27B0", "#673AB7", "#3F51B5", "#2196F3",
    "#03A9F4", "#00BCD4", "#009688", "#4CAF50", "#FF9800"
}

local function getAvatarColor(name)
    local sum = 0
    for i = 1, #name do
        sum = sum + string.byte(name, i)
    end
    return avatar_colors[(sum % #avatar_colors) + 1]
end

-- Initialize conversations data
local function initConversationsData()
    conversations = {
        {
            id = "1",
            name = "Alice Johnson",
            phone = "+1 555-0101",
            last_message = "Hey! Are you coming to the party tonight?",
            time = "2:34 PM",
            unread = 2,
            messages = {
                {sender = "them", text = "Hey!", time = "2:30 PM"},
                {sender = "them", text = "What are you up to?", time = "2:31 PM"},
                {sender = "me", text = "Not much, just working", time = "2:32 PM"},
                {sender = "them", text = "Cool! There's a party at Mike's tonight", time = "2:33 PM"},
                {sender = "them", text = "Hey! Are you coming to the party tonight?", time = "2:34 PM"},
            }
        },
        {
            id = "2",
            name = "Bob Williams",
            phone = "+1 555-0201",
            last_message = "Thanks for the help yesterday!",
            time = "1:15 PM",
            unread = 0,
            messages = {
                {sender = "them", text = "Hey, can you help me with something?", time = "Yesterday"},
                {sender = "me", text = "Sure, what do you need?", time = "Yesterday"},
                {sender = "them", text = "I need help moving some furniture", time = "Yesterday"},
                {sender = "me", text = "No problem, I'll be there at 2", time = "Yesterday"},
                {sender = "them", text = "Thanks for the help yesterday!", time = "1:15 PM"},
            }
        },
        {
            id = "3",
            name = "Carol Davis",
            phone = "+1 555-0301",
            last_message = "The meeting has been rescheduled to Friday",
            time = "Yesterday",
            unread = 0,
            messages = {
                {sender = "them", text = "Hi, are you free for a meeting tomorrow?", time = "Monday"},
                {sender = "me", text = "Let me check my calendar", time = "Monday"},
                {sender = "me", text = "Yes, I'm free at 3pm", time = "Monday"},
                {sender = "them", text = "The meeting has been rescheduled to Friday", time = "Yesterday"},
            }
        },
        {
            id = "4",
            name = "David Brown",
            phone = "+1 555-0401",
            last_message = "Can you send me the files?",
            time = "Yesterday",
            unread = 1,
            messages = {
                {sender = "them", text = "Hey, do you have the project files?", time = "Yesterday"},
                {sender = "me", text = "Which ones?", time = "Yesterday"},
                {sender = "them", text = "Can you send me the files?", time = "Yesterday"},
            }
        },
        {
            id = "5",
            name = "Emma Wilson",
            phone = "+1 555-0501",
            last_message = "See you at the coffee shop!",
            time = "Mon",
            unread = 0,
            messages = {
                {sender = "me", text = "Want to grab coffee later?", time = "Mon"},
                {sender = "them", text = "Sure! What time?", time = "Mon"},
                {sender = "me", text = "How about 4pm at the usual place?", time = "Mon"},
                {sender = "them", text = "See you at the coffee shop!", time = "Mon"},
            }
        },
        {
            id = "6",
            name = "Frank Miller",
            phone = "+1 555-0601",
            last_message = "Great game last night!",
            time = "Sun",
            unread = 0,
            messages = {
                {sender = "them", text = "Did you watch the game?", time = "Sun"},
                {sender = "me", text = "Yes! It was amazing!", time = "Sun"},
                {sender = "them", text = "Great game last night!", time = "Sun"},
            }
        },
        {
            id = "7",
            name = "Grace Lee",
            phone = "+1 555-0701",
            last_message = "Happy birthday! :)",
            time = "Sat",
            unread = 0,
            messages = {
                {sender = "them", text = "Happy birthday! :)", time = "Sat"},
                {sender = "me", text = "Thank you so much! :)", time = "Sat"},
            }
        },
    }
end

-- Initialize messages app
function initMessages(doc)
    print("[Messages] Initializing...")
    messages_doc = doc
    initConversationsData()
    renderConversations()
end

-- Render conversation list
function renderConversations()
    if not messages_doc then return end

    local container = messages_doc:GetElementById("conversations-list")
    if not container then return end

    local html = ""
    for _, conv in ipairs(conversations) do
        local color = getAvatarColor(conv.name)
        local initial = conv.name:sub(1, 1):upper()

        local unread_badge = ""
        if conv.unread > 0 then
            unread_badge = [[<div class="conversation-unread">]] .. conv.unread .. [[</div>]]
        end

        html = html .. [[
            <div class="conversation-item" onclick="openConversation(']] .. conv.id .. [[')">
                <div class="conversation-avatar" style="background-color: ]] .. color .. [[;">]] .. initial .. [[</div>
                <div class="conversation-content">
                    <div class="conversation-header">
                        <span class="conversation-name">]] .. conv.name .. [[</span>
                        <span class="conversation-time">]] .. conv.time .. [[</span>
                    </div>
                    <div class="conversation-preview">]] .. conv.last_message .. [[</div>
                </div>
                ]] .. unread_badge .. [[
            </div>
        ]]
    end

    container.inner_rml = html
end

-- Open a conversation
function openConversation(conv_id)
    print("[Messages] Opening conversation: " .. conv_id)

    -- Find conversation
    for _, conv in ipairs(conversations) do
        if conv.id == conv_id then
            current_conversation = conv
            current_messages = conv.messages
            conv.unread = 0  -- Mark as read
            break
        end
    end

    if current_conversation then
        -- Store for chat screen
        if mosis and mosis.state then
            mosis.state.set("current_chat", {
                id = current_conversation.id,
                name = current_conversation.name,
                phone = current_conversation.phone
            })
        end

        -- Navigate to chat
        if navigateTo then
            navigateTo("chat")
        else
            -- Inline chat view
            showChatInline()
        end
    end
end

-- Show chat inline
function showChatInline()
    if not messages_doc then return end

    local list = messages_doc:GetElementById("conversations-container")
    local chat = messages_doc:GetElementById("chat-container")

    if list and chat then
        list.style.display = "none"
        chat.style.display = "flex"
        renderChat()
    end
end

-- Hide chat and return to list
function hideChat()
    if not messages_doc then return end

    local list = messages_doc:GetElementById("conversations-container")
    local chat = messages_doc:GetElementById("chat-container")

    if list and chat then
        chat.style.display = "none"
        list.style.display = "flex"
        renderConversations()  -- Refresh to update unread counts
    end

    current_conversation = nil
end

-- Render chat messages
function renderChat()
    if not messages_doc or not current_conversation then return end

    -- Update header
    local name_el = messages_doc:GetElementById("chat-name")
    local avatar_el = messages_doc:GetElementById("chat-avatar")

    if name_el then
        name_el.inner_rml = current_conversation.name
    end

    if avatar_el then
        local color = getAvatarColor(current_conversation.name)
        local initial = current_conversation.name:sub(1, 1):upper()
        avatar_el.style["background-color"] = color
        avatar_el.inner_rml = initial
    end

    -- Render messages
    local container = messages_doc:GetElementById("chat-messages")
    if not container then return end

    local html = ""
    for _, msg in ipairs(current_messages) do
        local class = msg.sender == "me" and "message-sent" or "message-received"
        html = html .. [[
            <div class="message-bubble ]] .. class .. [[">]] .. msg.text .. [[</div>
        ]]
    end

    container.inner_rml = html

    -- Scroll to bottom
    -- Note: RmlUi may need specific handling for scroll
end

-- Send a message
function sendMessage()
    if not messages_doc or not current_conversation then return end

    local input = messages_doc:GetElementById("message-input")
    if not input then return end

    local text = input.value or ""
    if text == "" then return end

    print("[Messages] Sending: " .. text)

    -- Add message to current conversation
    table.insert(current_messages, {
        sender = "me",
        text = text,
        time = "Just now"
    })

    -- Update conversation preview
    current_conversation.last_message = text
    current_conversation.time = "Just now"

    -- Clear input
    input.value = ""

    -- Re-render chat
    renderChat()

    -- Simulate reply after delay
    if setTimeout then
        setTimeout(function()
            simulateReply()
        end, 2000 + math.random(1000, 3000))
    end
end

-- Simulate a reply
function simulateReply()
    if not current_conversation then return end

    local replies = {
        "That's great!",
        "I see",
        "Sounds good!",
        "Let me think about it",
        "Sure thing!",
        "OK!",
        "Thanks!",
        "Got it",
        "Nice!",
        "Interesting..."
    }

    local reply = replies[math.random(#replies)]

    table.insert(current_messages, {
        sender = "them",
        text = reply,
        time = "Just now"
    })

    current_conversation.last_message = reply
    current_conversation.time = "Just now"

    renderChat()
end

-- Handle input keypress (for Enter to send)
function onMessageKeypress(event)
    if event.key == "Return" or event.key == "Enter" then
        sendMessage()
        return true
    end
    return false
end

-- Start new conversation
function newConversation()
    print("[Messages] New conversation")
    if showToast then
        showToast("New message")
    end
end

-- Search conversations
function searchConversations(query)
    print("[Messages] Searching: " .. query)
    -- TODO: Implement search filtering
end

-- Delete conversation
function deleteConversation(conv_id)
    print("[Messages] Deleting conversation: " .. conv_id)

    for i, conv in ipairs(conversations) do
        if conv.id == conv_id then
            table.remove(conversations, i)
            break
        end
    end

    renderConversations()

    if showToast then
        showToast("Conversation deleted")
    end
end

-- Call contact from chat
function callFromChat()
    if not current_conversation then return end

    print("[Messages] Calling from chat: " .. current_conversation.name)

    if mosis and mosis.state then
        mosis.state.set("current_call", {
            number = current_conversation.phone,
            name = current_conversation.name
        })
    end

    if navigateTo then
        navigateTo("calling")
    else
        if showToast then
            showToast("Calling " .. current_conversation.name)
        end
    end
end