//! Data Transfer Objects (DTOs) for the CMS REST API.
//!
//! These types define the wire format accepted and returned by HTTP handlers.
//! They are intentionally independent of the domain entities so the API
//! contract can evolve without coupling to the domain model.
//!
//! ## DTOs
//! - `SettingsUpdateRequest` — partial-update body for PUT /settings
//! - `SettingsResponse` — response body for GET /settings (API keys redacted)
//! - `MemoryCreateRequest` — request body for POST /memories
//! - `MemoryResponse` — response body for memory operations
//! - `ConversationResponse` — response body for GET /conversation
//!
//! ## Conventions
//! - `From<DomainType>` impls convert domain entities → DTO responses
//! - API key values are **redacted** in responses (only key names exposed)
//! - Request fields use `Option` to support partial updates

use serde::{Deserialize, Serialize};

// ---------------------------------------------------------------------------
// Settings
// ---------------------------------------------------------------------------

/// Request body for updating settings (partial update — only specified fields
/// are changed).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SettingsUpdateRequest {
    pub internet_mode: Option<String>,
    pub provider: Option<String>,
    pub model: Option<String>,
    pub api_keys: Option<std::collections::HashMap<String, String>>,
    pub max_tokens: Option<Option<u32>>,
    pub temperature: Option<Option<f32>>,
    pub review_max_lessons_per_run: Option<usize>,
    pub adaptive_review_max_skip: Option<u32>,
    pub verify_command: Option<Option<String>>,
    pub verify_timeout_ms: Option<u64>,
    pub workflow_max_concurrency: Option<usize>,
    pub review_enabled: Option<bool>,
    pub session_archive_enabled: Option<bool>,
    pub lsp_auto_provision: Option<bool>,
    pub lsp_languages: Option<Vec<String>>,
    pub hive_mind_node_timeout_ms: Option<u64>,
}

/// Response body for settings.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SettingsResponse {
    pub internet_mode: String,
    pub provider: String,
    pub model: String,
    pub api_keys: Vec<String>, // key names only, values redacted
    pub max_tokens: Option<u32>,
    pub temperature: Option<f32>,
    pub review_max_lessons_per_run: usize,
    pub adaptive_review_max_skip: u32,
    pub verify_command: Option<String>,
    pub verify_timeout_ms: u64,
    pub workflow_max_concurrency: usize,
    pub review_enabled: bool,
    pub session_archive_enabled: bool,
    pub lsp_auto_provision: bool,
    pub lsp_languages: Vec<String>,
    pub hive_mind_node_timeout_ms: u64,
}

/// Convert a domain `Settings` entity into its API response representation.
///
/// ## Side-effects
/// - API key **values are redacted** — only key names are exposed.
impl From<crate::domain::settings::Settings> for SettingsResponse {
    fn from(s: crate::domain::settings::Settings) -> Self {
        Self {
            internet_mode: format!("{:?}", s.internet_mode),
            provider: s.provider,
            model: s.model,
            api_keys: s.api_keys.keys().cloned().collect(),
            max_tokens: s.max_tokens,
            temperature: s.temperature,
            review_max_lessons_per_run: s.review_max_lessons_per_run,
            adaptive_review_max_skip: s.adaptive_review_max_skip,
            verify_command: s.verify_command,
            verify_timeout_ms: s.verify_timeout_ms,
            workflow_max_concurrency: s.workflow_max_concurrency,
            review_enabled: s.flags.review_enabled,
            session_archive_enabled: s.flags.session_archive_enabled,
            lsp_auto_provision: s.flags.lsp_auto_provision,
            lsp_languages: s.lsp_languages,
            hive_mind_node_timeout_ms: s.hive_mind_node_timeout_ms,
        }
    }
}

// ---------------------------------------------------------------------------
// Memory
// ---------------------------------------------------------------------------

/// Request body for creating or updating a memory.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryCreateRequest {
    pub name: String,
    pub description: String,
    pub content: String,
    pub kind: Option<String>,
    pub outcome: Option<String>,
    pub lifecycle: Option<String>,
    pub scope: Option<String>,
    pub before_snippet: Option<String>,
    pub after_snippet: Option<String>,
    pub provenances: Option<Vec<String>>,
}

/// Response body for a memory.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryResponse {
    pub name: String,
    pub description: String,
    pub content: String,
    pub kind: String,
    pub created_at: i64,
    pub updated_at: i64,
    pub outcome: Option<String>,
    pub lifecycle: String,
    pub scope: Option<String>,
    pub before_snippet: Option<String>,
    pub after_snippet: Option<String>,
    pub provenances: Vec<String>,
}

/// Convert a domain `Memory` entity into its API response representation.
impl From<crate::domain::memory::Memory> for MemoryResponse {
    fn from(m: crate::domain::memory::Memory) -> Self {
        Self {
            name: m.name,
            description: m.description,
            content: m.content,
            kind: m.kind,
            created_at: m.created_at,
            updated_at: m.updated_at,
            outcome: m.outcome,
            lifecycle: m.lifecycle,
            scope: m.scope,
            before_snippet: m.before_snippet,
            after_snippet: m.after_snippet,
            provenances: m.provenances,
        }
    }
}

// ---------------------------------------------------------------------------
// Conversation
// ---------------------------------------------------------------------------

/// Response body for a conversation.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConversationResponse {
    pub session_id: String,
    pub message_count: usize,
    pub model: String,
    pub system_prompt: String,
    pub max_tokens: Option<u32>,
    pub temperature: Option<f32>,
}

/// Convert a domain `Conversation` entity into its API response summary.
///
/// ## Note
/// Only metadata is included (message count, model, system prompt);
/// individual messages are not returned in this response.
impl From<crate::domain::conversation::Conversation> for ConversationResponse {
    fn from(c: crate::domain::conversation::Conversation) -> Self {
        let message_count = c.len();
        Self {
            session_id: c.session_id,
            message_count,
            model: c.model,
            system_prompt: c.system_prompt,
            max_tokens: c.max_tokens,
            temperature: c.temperature,
        }
    }
}