use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UsageInfo {
    pub input_tokens: u64,
    pub output_tokens: u64,
    #[serde(default)]
    pub cache_creation_input_tokens: Option<u64>,
    #[serde(default)]
    pub cache_read_input_tokens: Option<u64>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
#[serde(rename_all = "snake_case")]
pub enum CharacterState {
    #[default]
    Idle,
    Thinking,
    Typing,
    Searching,
    Coding,
    Mcp,
    Permission,
    Success,
    Error,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum ConnectionStatus {
    #[default]
    Disconnected,
    Connecting,
    Connected,
    Error,
}

#[allow(dead_code)]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TerminalLine {
    pub id: String,
    #[serde(rename = "type")]
    pub line_type: String,
    pub content: String,
    pub timestamp: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_name: Option<String>,
}

#[allow(dead_code)]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PermissionRequest {
    pub id: String,
    pub tool: String,
    pub description: String,
    pub input: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PermissionDenial {
    pub tool_name: String,
    pub tool_use_id: String,
    pub tool_input: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum ClaudeMessage {
    #[serde(rename = "system")]
    System {
        subtype: String,
        #[serde(default)]
        session_id: Option<String>,
        #[serde(default)]
        cwd: Option<String>,
        #[serde(default)]
        tools: Option<Vec<String>>,
    },
    #[serde(rename = "assistant")]
    Assistant {
        message: AssistantMessageContent,
        #[serde(default)]
        parent_tool_use_id: Option<String>,
    },
    #[serde(rename = "user")]
    User { message: UserMessageContent },
    #[serde(rename = "stream_event")]
    StreamEvent { event: StreamEventData },
    #[serde(rename = "result")]
    Result {
        subtype: String,
        #[serde(default)]
        result: Option<String>,
        #[serde(default)]
        duration_ms: Option<u64>,
        #[serde(default)]
        num_turns: Option<u32>,
        #[serde(default)]
        permission_denials: Option<Vec<PermissionDenial>>,
        #[serde(default)]
        usage: Option<UsageInfo>,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssistantMessageContent {
    pub content: Vec<ContentBlock>,
    #[serde(default)]
    pub model: Option<String>,
    #[serde(default)]
    pub stop_reason: Option<String>,
    #[serde(default)]
    pub usage: Option<UsageInfo>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserMessageContent {
    pub content: Vec<ContentBlock>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum ContentBlock {
    #[serde(rename = "text")]
    Text { text: String },
    #[serde(rename = "thinking")]
    Thinking { thinking: String },
    #[serde(rename = "tool_use")]
    ToolUse {
        id: String,
        name: String,
        input: serde_json::Value,
    },
    #[serde(rename = "tool_result")]
    ToolResult {
        tool_use_id: String,
        content: serde_json::Value,
        #[serde(default)]
        is_error: Option<bool>,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StreamEventData {
    #[serde(rename = "type")]
    pub event_type: String,
    #[serde(default)]
    pub index: Option<u32>,
    #[serde(default)]
    pub content_block: Option<ContentBlockStart>,
    #[serde(default)]
    pub delta: Option<DeltaContent>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ContentBlockStart {
    #[serde(rename = "type")]
    pub block_type: String,
    #[serde(default)]
    pub id: Option<String>,
    #[serde(default)]
    pub name: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeltaContent {
    #[serde(rename = "type")]
    pub delta_type: String,
    #[serde(default)]
    pub text: Option<String>,
    #[serde(default)]
    pub thinking: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StateChangeEvent {
    pub state: CharacterState,
    pub tool_name: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

/// Cost information for a message
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MessageCost {
    pub input_tokens: u64,
    pub output_tokens: u64,
    pub cost_usd: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OutputEvent {
    pub line_type: String,
    pub content: String,
    pub tool_name: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub cost: Option<MessageCost>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PermissionPromptEvent {
    pub id: String,
    pub tool_name: String,
    pub tool_input: serde_json::Value,
    pub description: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConnectionEvent {
    pub status: ConnectionStatus,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionEvent {
    pub session_id: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkingDirectoryEvent {
    pub directory: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuestionOption {
    pub label: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserQuestionEvent {
    pub id: String,
    pub question: String,
    pub header: Option<String>,
    pub options: Vec<QuestionOption>,
    pub multi_select: bool,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub conversation_id: Option<String>,
}

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

    #[test]
    fn test_character_state_default() {
        let state = CharacterState::default();
        assert_eq!(state, CharacterState::Idle);
    }

    #[test]
    fn test_connection_status_default() {
        let status = ConnectionStatus::default();
        matches!(status, ConnectionStatus::Disconnected);
    }

    #[test]
    fn test_character_state_serialization() {
        let state = CharacterState::Thinking;
        let serialized = serde_json::to_string(&state).unwrap();
        assert_eq!(serialized, "\"thinking\"");

        let deserialized: CharacterState = serde_json::from_str(&serialized).unwrap();
        assert_eq!(deserialized, CharacterState::Thinking);
    }

    #[test]
    fn test_all_character_states_serialize() {
        let states = vec![
            (CharacterState::Idle, "\"idle\""),
            (CharacterState::Thinking, "\"thinking\""),
            (CharacterState::Typing, "\"typing\""),
            (CharacterState::Searching, "\"searching\""),
            (CharacterState::Coding, "\"coding\""),
            (CharacterState::Mcp, "\"mcp\""),
            (CharacterState::Permission, "\"permission\""),
            (CharacterState::Success, "\"success\""),
            (CharacterState::Error, "\"error\""),
        ];

        for (state, expected) in states {
            let serialized = serde_json::to_string(&state).unwrap();
            assert_eq!(serialized, expected, "Failed for state: {:?}", state);
        }
    }

    #[test]
    fn test_terminal_line_serialization() {
        let line = TerminalLine {
            id: "test-123".to_string(),
            line_type: "assistant".to_string(),
            content: "Hello, world!".to_string(),
            timestamp: "2024-01-01T00:00:00Z".to_string(),
            tool_name: None,
        };

        let serialized = serde_json::to_string(&line).unwrap();
        assert!(serialized.contains("\"type\":\"assistant\""));
        assert!(serialized.contains("\"content\":\"Hello, world!\""));
        assert!(!serialized.contains("tool_name"));
    }

    #[test]
    fn test_terminal_line_with_tool_name() {
        let line = TerminalLine {
            id: "test-456".to_string(),
            line_type: "tool".to_string(),
            content: "Reading file...".to_string(),
            timestamp: "2024-01-01T00:00:00Z".to_string(),
            tool_name: Some("Read".to_string()),
        };

        let serialized = serde_json::to_string(&line).unwrap();
        assert!(serialized.contains("\"tool_name\":\"Read\""));
    }

    #[test]
    fn test_content_block_text() {
        let block = ContentBlock::Text {
            text: "Hello!".to_string(),
        };

        let serialized = serde_json::to_string(&block).unwrap();
        assert!(serialized.contains("\"type\":\"text\""));
        assert!(serialized.contains("\"text\":\"Hello!\""));
    }

    #[test]
    fn test_content_block_tool_use() {
        let block = ContentBlock::ToolUse {
            id: "tool-123".to_string(),
            name: "Read".to_string(),
            input: serde_json::json!({"file_path": "/test.txt"}),
        };

        let serialized = serde_json::to_string(&block).unwrap();
        assert!(serialized.contains("\"type\":\"tool_use\""));
        assert!(serialized.contains("\"name\":\"Read\""));
    }

    #[test]
    fn test_state_change_event() {
        let event = StateChangeEvent {
            state: CharacterState::Coding,
            tool_name: Some("Edit".to_string()),
            conversation_id: None,
        };

        let serialized = serde_json::to_string(&event).unwrap();
        assert!(serialized.contains("\"state\":\"coding\""));
        assert!(serialized.contains("\"tool_name\":\"Edit\""));
    }

    #[test]
    fn test_output_event() {
        let event = OutputEvent {
            line_type: "assistant".to_string(),
            content: "Test output".to_string(),
            tool_name: None,
            conversation_id: None,
            cost: None,
        };

        let serialized = serde_json::to_string(&event).unwrap();
        assert!(serialized.contains("\"line_type\":\"assistant\""));
        assert!(serialized.contains("\"content\":\"Test output\""));
    }

    #[test]
    fn test_output_event_with_cost() {
        let event = OutputEvent {
            line_type: "assistant".to_string(),
            content: "Test output".to_string(),
            tool_name: None,
            conversation_id: Some("conv-123".to_string()),
            cost: Some(MessageCost {
                input_tokens: 100,
                output_tokens: 50,
                cost_usd: 0.005,
            }),
        };

        let serialized = serde_json::to_string(&event).unwrap();
        assert!(serialized.contains("\"cost\":"));
        assert!(serialized.contains("\"input_tokens\":100"));
        assert!(serialized.contains("\"output_tokens\":50"));
    }
}