pub use codex_api::ResponseEvent;
use codex_config::types::Personality;
use codex_protocol::error::Result;
use codex_protocol::models::BaseInstructions;
use codex_protocol::models::ContentItem;
use codex_protocol::models::FunctionCallOutputContentItem;
use codex_protocol::models::ResponseItem;
use codex_protocol::protocol::InterAgentCommunication;
use codex_tools::ToolSpec;
use futures::Stream;
use serde_json::Value;
use std::pin::Pin;
use std::task::Context;
use std::task::Poll;
use tokio::sync::mpsc;
use tokio_util::sync::CancellationToken;

/// API request payload for a single model turn
#[derive(Debug, Clone)]
pub struct Prompt {
    /// Conversation context input items.
    pub input: Vec<ResponseItem>,

    /// Tools available to the model, including additional tools sourced from
    /// external MCP servers.
    pub(crate) tools: Vec<ToolSpec>,

    /// Whether parallel tool calls are permitted for this prompt.
    pub(crate) parallel_tool_calls: bool,

    pub base_instructions: BaseInstructions,

    /// Optionally specify the personality of the model.
    pub personality: Option<Personality>,

    /// Optional the output schema for the model's response.
    pub output_schema: Option<Value>,

    /// Whether the Responses API should strictly validate `output_schema`.
    pub output_schema_strict: bool,
}

impl Default for Prompt {
    fn default() -> Self {
        Self {
            input: Vec::new(),
            tools: Vec::new(),
            parallel_tool_calls: false,
            base_instructions: BaseInstructions::default(),
            personality: None,
            output_schema: None,
            output_schema_strict: true,
        }
    }
}

impl Prompt {
    pub(crate) fn get_formatted_input(&self) -> Vec<ResponseItem> {
        self.input
            .iter()
            .cloned()
            .map(|item| {
                let ResponseItem::Message { role, content, .. } = &item else {
                    return item;
                };
                if role != "assistant" {
                    return item;
                }
                InterAgentCommunication::from_message_content(content)
                    .filter(|communication| communication.encrypted_content.is_some())
                    .map(|communication| communication.to_model_input_item())
                    .unwrap_or(item)
            })
            .collect()
    }

    pub(crate) fn get_formatted_input_for_request(
        &self,
        use_responses_lite: bool,
    ) -> Vec<ResponseItem> {
        let mut input = self.get_formatted_input();
        if use_responses_lite {
            strip_image_details(&mut input);
        }
        input
    }
}

fn strip_image_details(items: &mut [ResponseItem]) {
    for item in items {
        match item {
            ResponseItem::Message { content, .. } => {
                for content_item in content {
                    if let ContentItem::InputImage { detail, .. } = content_item {
                        *detail = None;
                    }
                }
            }
            ResponseItem::FunctionCallOutput { output, .. }
            | ResponseItem::CustomToolCallOutput { output, .. } => {
                if let Some(content) = output.content_items_mut() {
                    for content_item in content {
                        if let FunctionCallOutputContentItem::InputImage { detail, .. } =
                            content_item
                        {
                            *detail = None;
                        }
                    }
                }
            }
            ResponseItem::Reasoning { .. }
            | ResponseItem::AgentMessage { .. }
            | ResponseItem::LocalShellCall { .. }
            | ResponseItem::FunctionCall { .. }
            | ResponseItem::ToolSearchCall { .. }
            | ResponseItem::CustomToolCall { .. }
            | ResponseItem::ToolSearchOutput { .. }
            | ResponseItem::WebSearchCall { .. }
            | ResponseItem::ImageGenerationCall { .. }
            | ResponseItem::Compaction { .. }
            | ResponseItem::CompactionTrigger
            | ResponseItem::ContextCompaction { .. }
            | ResponseItem::Other => {}
        }
    }
}

pub struct ResponseStream {
    pub(crate) rx_event: mpsc::Receiver<Result<ResponseEvent>>,
    /// Signals the mapper task that the consumer stopped polling before the
    /// provider stream reached its own terminal event.
    pub(crate) consumer_dropped: CancellationToken,
}

impl Stream for ResponseStream {
    type Item = Result<ResponseEvent>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        self.rx_event.poll_recv(cx)
    }
}

impl Drop for ResponseStream {
    fn drop(&mut self) {
        self.consumer_dropped.cancel();
    }
}

#[cfg(test)]
#[path = "client_common_tests.rs"]
mod tests;