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use std::fmt;

use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Message {
    pub role: String,
    pub content: Option<String>,
    pub name: Option<String>,
    pub function_call: Option<FunctionCall>,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct FunctionCall {
    pub name: String,
    pub arguments: String,
}

impl Message {
    pub fn new(role: String) -> Message {
        Message {
            role,
            content: None,
            name: None,
            function_call: None,
        }
    }

    pub fn new_user_message(content: String) -> Message {
        Message {
            role: "user".to_string(),
            content: Some(content),
            name: None,
            function_call: None,
        }
    }

    pub fn set_content(&mut self, content: String) {
        self.content = Some(content);
    }

    pub fn set_name(&mut self, name: String) {
        self.name = Some(name);
    }

    pub fn set_function_call(&mut self, function_call: FunctionCall) {
        self.function_call = Some(function_call);
    }
}

// Print valid JSON for Message, no commas if last field
impl fmt::Display for Message {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{{\"role\":\"{}\"", self.role)?;
        if let Some(content) = &self.content {
            write!(f, ",\"content\":\"{}\"", content)?;
        }
        if let Some(name) = &self.name {
            write!(f, ",\"name\":\"{}\"", name)?;
        }
        if let Some(function_call) = &self.function_call {
            write!(f, ",\"function_call\":{}", function_call)?;
        }
        write!(f, "}}")
    }
}

// Print valid JSON for FunctionCall, no commas if last field
impl fmt::Display for FunctionCall {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "{{\"name\":\"{}\",\"arguments\":{}}}",
            self.name, self.arguments
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_display_message() {
        let mut message = Message::new("role".to_string());
        assert_eq!(message.to_string(), "{\"role\":\"role\"}".to_string());

        message.set_content("content".to_string());
        assert_eq!(
            message.to_string(),
            "{\"role\":\"role\",\"content\":\"content\"}".to_string()
        );

        message.set_name("name".to_string());
        assert_eq!(
            message.to_string(),
            "{\"role\":\"role\",\"content\":\"content\",\"name\":\"name\"}".to_string()
        );

        let function_call = FunctionCall {
            name: "name".to_string(),
            arguments: "{\"example\":\"this\"}".to_string(),
        };
        message.set_function_call(function_call);
        assert_eq!(
            message.to_string(),
            "{\"role\":\"role\",\"content\":\"content\",\"name\":\"name\",\"function_call\":{\"name\":\"name\",\"arguments\":{\"example\":\"this\"}}}".to_string()
        );
    }

    #[test]
    fn test_display_function_call_no_name() {
        let function_call = FunctionCall {
            name: "".to_string(),
            arguments: "{\"example\":\"this\"}".to_string(),
        };
        assert_eq!(
            function_call.to_string(),
            "{\"name\":\"\",\"arguments\":{\"example\":\"this\"}}".to_string()
        );
    }

    #[test]
    fn test_display_function_call_no_arguments() {
        let function_call = FunctionCall {
            name: "name".to_string(),
            arguments: "{}".to_string(),
        };
        assert_eq!(
            function_call.to_string(),
            "{\"name\":\"name\",\"arguments\":{}}".to_string()
        );
    }

    #[test]
    fn test_display_function_call() {
        let function_call = FunctionCall {
            name: "name".to_string(),
            arguments: "{\"example\":\"this\"}".to_string(),
        };
        assert_eq!(
            function_call.to_string(),
            "{\"name\":\"name\",\"arguments\":{\"example\":\"this\"}}".to_string()
        );
    }
}