use tokio::sync::mpsc;

use crate::{
    ReasoningProvenance, model::HostedToolSearchCall, model::HostedWebSearchCall,
    model::ImageGenerationCall, model::ImageGenerationResult, model::ImageSource, model::Role,
    model::TokenUsage, model::ToolResultContent, model::WebSearchAction,
};

pub type ProviderEventStream = mpsc::UnboundedReceiver<Result<ProviderEvent, crate::ProviderError>>;

#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct ResponseHeaders {
    pub values: Vec<(String, String)>,
}

#[derive(Debug, Clone, PartialEq)]
pub enum ProviderEvent {
    ResponseHeaders(ResponseHeaders),
    ResponseCreated,
    MessageStarted {
        id: String,
        model: String,
        role: Role,
    },
    ContentBlockStarted {
        index: usize,
        kind: ContentBlockStart,
    },
    ContentBlockDelta {
        index: usize,
        delta: ContentBlockDelta,
    },
    ContentBlockStopped {
        index: usize,
    },
    MessageDelta {
        stop_reason: Option<String>,
        usage: Option<TokenUsage>,
    },
    ReasoningSummaryDelta {
        delta: String,
        summary_index: i64,
    },
    ReasoningContentDelta {
        delta: String,
        content_index: i64,
    },
    ReasoningSummaryPartAdded {
        summary_index: i64,
    },
    MessageStopped,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ContentBlockStart {
    Text,
    Thinking {
        encrypted_content: Option<String>,
        id: Option<String>,
        provenance: Option<ReasoningProvenance>,
        redacted: bool,
    },
    Image {
        source: ImageSource,
    },
    ToolUse {
        id: String,
        name: String,
    },
    ToolResult {
        tool_use_id: String,
        is_error: bool,
        content: Option<ToolResultContent>,
    },
    HostedToolSearch {
        call: HostedToolSearchCall,
    },
    HostedWebSearch {
        call: HostedWebSearchCall,
    },
    ImageGeneration {
        call: ImageGenerationCall,
    },
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ContentBlockDelta {
    Text(String),
    ThinkingText(String),
    ThinkingSignature(String),
    ThinkingEncryptedContent(String),
    ToolUseInputJson(String),
    ToolResultContent(ToolResultContent),
    HostedToolSearchQuery(String),
    HostedToolSearchStatus(String),
    HostedWebSearchAction(WebSearchAction),
    HostedWebSearchStatus(String),
    ImageGenerationStatus(String),
    ImageGenerationRevisedPrompt(String),
    ImageGenerationResult(ImageGenerationResult),
}