use crate::{
    chat_database::ChatDatabase, 
    models::{
        conversation::{Conversation, ConversationBuilder},
        participant::Participant,
        message::Message,
    }
};

// Helper function to compare participants ignoring database IDs
fn participants_equal_ignoring_id(a: &Participant, b: &Participant) -> bool {
    match (a, b) {
        (Participant::Me, Participant::Me) => true,
        (Participant::Remote { display_name: name_a, .. }, 
         Participant::Remote { display_name: name_b, .. }) => name_a == name_b,
        _ => false
    }
}

fn participants_vec_equal_ignoring_id(a: &[Participant], b: &[Participant]) -> bool {
    if a.len() != b.len() {
        return false;
    }
    a.iter().zip(b.iter()).all(|(a, b)| participants_equal_ignoring_id(a, b))
}

#[test]
fn test_database_init() {
    let _ = ChatDatabase::new_in_memory().unwrap();
}

#[test]
fn test_add_conversation() {
    let mut db = ChatDatabase::new_in_memory().unwrap();

    let guid = "test";
    let test_conversation = Conversation::builder()
        .guid(guid)
        .unread_count(2)
        .display_name("Test Conversation")
        .build();

    db.insert_conversation(test_conversation.clone()).unwrap();

    // Try to fetch with id now 
    let conversation = db.get_conversation_by_guid(guid).unwrap().unwrap();
    assert_eq!(conversation.guid, "test");

    // Modify the conversation and update it
    let modified_conversation = test_conversation.into_builder()
        .display_name("Modified Conversation")
        .build();

    db.insert_conversation(modified_conversation.clone()).unwrap();

    // Make sure we still only have one conversation. 
    let all_conversations = db.all_conversations().unwrap();
    assert_eq!(all_conversations.len(), 1);

    // And make sure the display name was updated 
    let conversation = db.get_conversation_by_guid(guid).unwrap().unwrap();
    assert_eq!(conversation.display_name.unwrap(), "Modified Conversation");
}

#[test]
fn test_conversation_participants() {
    let mut db = ChatDatabase::new_in_memory().unwrap();

    let participants: Vec<Participant> = vec!["one".into(), "two".into()];

    let guid = uuid::Uuid::new_v4().to_string();
    let conversation = ConversationBuilder::new()
        .guid(&guid)
        .display_name("Test")
        .participants(participants.clone())
        .build();

    db.insert_conversation(conversation).unwrap();

    let read_conversation = db.get_conversation_by_guid(&guid).unwrap().unwrap();
    let read_participants = read_conversation.participants;

    assert!(participants_vec_equal_ignoring_id(&participants, &read_participants));

    // Try making another conversation with the same participants
    let conversation = ConversationBuilder::new()
        .display_name("A Different Test")
        .participants(participants.clone())
        .build();

    db.insert_conversation(conversation).unwrap();

    let read_conversation = db.get_conversation_by_guid(&guid).unwrap().unwrap();
    let read_participants: Vec<Participant> = read_conversation.participants;

    assert!(participants_vec_equal_ignoring_id(&participants, &read_participants));
}

#[test]
fn test_all_conversations_with_participants() {
    let mut db = ChatDatabase::new_in_memory().unwrap();

    // Create two conversations with different participants
    let participants1: Vec<Participant> = vec!["one".into(), "two".into()];
    let participants2: Vec<Participant> = vec!["three".into(), "four".into()];

    let guid1 = uuid::Uuid::new_v4().to_string();
    let conversation1 = ConversationBuilder::new()
        .guid(&guid1)
        .display_name("Test 1")
        .participants(participants1.clone())
        .build();

    let guid2 = uuid::Uuid::new_v4().to_string();
    let conversation2 = ConversationBuilder::new()
        .guid(&guid2)
        .display_name("Test 2")
        .participants(participants2.clone())
        .build();

    // Insert both conversations
    db.insert_conversation(conversation1).unwrap();
    db.insert_conversation(conversation2).unwrap();

    // Get all conversations and verify the results
    let all_conversations = db.all_conversations().unwrap();
    assert_eq!(all_conversations.len(), 2);

    // Find and verify each conversation's participants
    let conv1 = all_conversations.iter().find(|c| c.guid == guid1).unwrap();
    let conv2 = all_conversations.iter().find(|c| c.guid == guid2).unwrap();

    assert!(participants_vec_equal_ignoring_id(&conv1.participants, &participants1));
    assert!(participants_vec_equal_ignoring_id(&conv2.participants, &participants2));
}

#[test]
fn test_messages() {
    let mut db = ChatDatabase::new_in_memory().unwrap();

    // First create a conversation with participants
    let participants = vec!["Alice".into(), "Bob".into()];
    let conversation = ConversationBuilder::new()
        .display_name("Test Chat")
        .participants(participants)
        .build();
    let conversation_id = conversation.guid.clone();

    db.insert_conversation(conversation).unwrap();

    // Create and insert a message from Me
    let message1 = Message::builder()
        .text("Hello everyone!".to_string())
        .build();

    // Create and insert a message from a remote participant
    let message2 = Message::builder()
        .text("Hi there!".to_string())
        .sender("Alice".into())
        .build();

    // Insert both messages
    db.insert_message(&conversation_id, message1.clone()).unwrap();
    db.insert_message(&conversation_id, message2.clone()).unwrap();

    // Retrieve messages
    let messages = db.get_messages_for_conversation(&conversation_id).unwrap();
    assert_eq!(messages.len(), 2);

    // Verify first message (from Me)
    let retrieved_message1 = messages.iter().find(|m| m.id == message1.id).unwrap();
    assert_eq!(retrieved_message1.text, "Hello everyone!");
    assert!(matches!(retrieved_message1.sender, Participant::Me));

    // Verify second message (from Alice)
    let retrieved_message2 = messages.iter().find(|m| m.id == message2.id).unwrap();
    assert_eq!(retrieved_message2.text, "Hi there!");
    if let Participant::Remote { display_name, .. } = &retrieved_message2.sender {
        assert_eq!(display_name, "Alice");
    } else {
        panic!("Expected Remote participant. Got: {:?}", retrieved_message2.sender);
    }
}

#[test]
fn test_message_ordering() {
    let mut db = ChatDatabase::new_in_memory().unwrap();

    // Create a conversation
    let conversation = ConversationBuilder::new()
        .display_name("Test Chat")
        .build();
    let conversation_id = conversation.guid.clone();
    db.insert_conversation(conversation).unwrap();

    // Create messages with specific timestamps
    let now = chrono::Utc::now().naive_utc();
    let message1 = Message::builder()
        .text("First message".to_string())
        .date(now)
        .build();

    let message2 = Message::builder()
        .text("Second message".to_string())
        .date(now + chrono::Duration::minutes(1))
        .build();

    let message3 = Message::builder()
        .text("Third message".to_string())
        .date(now + chrono::Duration::minutes(2))
        .build();

    // Insert messages
    db.insert_message(&conversation_id, message1).unwrap();
    db.insert_message(&conversation_id, message2).unwrap();
    db.insert_message(&conversation_id, message3).unwrap();

    // Retrieve messages and verify order
    let messages = db.get_messages_for_conversation(&conversation_id).unwrap();
    assert_eq!(messages.len(), 3);

    // Messages should be ordered by date
    for i in 1..messages.len() {
        assert!(messages[i].date > messages[i-1].date);
    }
}