use chrono::Utc;
use dirigent_protocol::types::meta::{Meta, ProviderMeta};
use dirigent_protocol::{Session, SessionMetadata};
use std::collections::HashMap;

fn main() {
    println!("=== SessionMetadata JSON Examples ===\n");

    // Example 1: Without new fields (backward compatible)
    println!("1. Basic SessionMetadata (without new fields):");
    let basic = SessionMetadata {
        project_path: "/workspace/project".to_string(),
        model: Some("gpt-4".to_string()),
        total_messages: 10,
        system_message: None,
        current_mode_id: None,
        _meta: None,
        project_id: None,
    };
    let json = serde_json::to_string_pretty(&basic).unwrap();
    println!("{}\n", json);

    // Example 2: With current_mode_id
    println!("2. SessionMetadata with current_mode_id:");
    let with_mode = SessionMetadata {
        project_path: "/workspace/project".to_string(),
        model: Some("claude-3-sonnet".to_string()),
        total_messages: 5,
        system_message: Some("You are a helpful coding assistant".to_string()),
        current_mode_id: Some("code_mode".to_string()),
        _meta: None,
        project_id: None,
    };
    let json = serde_json::to_string_pretty(&with_mode).unwrap();
    println!("{}\n", json);

    // Example 3: With provider metadata
    println!("3. SessionMetadata with provider metadata:");
    let meta = Meta {
        provider: Some(ProviderMeta {
            name: "opencode".to_string(),
            original_ids: Some(HashMap::from([
                ("session_id".to_string(), "ses_abc123xyz".to_string()),
                ("project_id".to_string(), "proj_456".to_string()),
            ])),
            raw_excerpt: Some(serde_json::json!({
                "version": "0.15.31",
                "share": null
            })),
        }),
        extra: HashMap::new(),
    };

    let with_meta = SessionMetadata {
        project_path: "/workspace/project".to_string(),
        model: Some("gpt-4-turbo".to_string()),
        total_messages: 15,
        system_message: Some("System prompt here".to_string()),
        current_mode_id: Some("architect".to_string()),
        _meta: Some(meta),
        project_id: None,
    };
    let json = serde_json::to_string_pretty(&with_meta).unwrap();
    println!("{}\n", json);

    // Example 4: Full Session object
    println!("4. Complete Session with all metadata fields:");
    let now = Utc::now();
    let session = Session {
        id: "ses_demo_123".to_string(),
        title: "My Coding Session".to_string(),
        created_at: now,
        updated_at: now,
        metadata: with_meta,
        models: None,
        modes: None,
        config_options: None,
        acp_client_id: None,
        cwd: None,
    };
    let json = serde_json::to_string_pretty(&session).unwrap();
    println!("{}\n", json);

    // Example 5: Verify backward compatibility
    println!("5. Backward compatibility test (deserializing old format):");
    let old_json = r#"{
        "project_path": "/old/project",
        "model": "gpt-3.5",
        "total_messages": 3
    }"#;

    let parsed: SessionMetadata = serde_json::from_str(old_json).unwrap();
    println!("Successfully parsed old JSON format:");
    println!("  project_path: {}", parsed.project_path);
    println!("  model: {:?}", parsed.model);
    println!("  total_messages: {}", parsed.total_messages);
    println!("  system_message: {:?}", parsed.system_message);
    println!("  current_mode_id: {:?}", parsed.current_mode_id);
    println!("  _meta: {:?}", parsed._meta);
}