//! Database schema definitions

/// Current schema version
pub const SCHEMA_VERSION: i32 = 2;

/// Schema creation SQL
pub const CREATE_SCHEMA: &str = r#"
-- Agents table
CREATE TABLE IF NOT EXISTS agents (
    id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    config TEXT NOT NULL,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

-- Sessions table
CREATE TABLE IF NOT EXISTS sessions (
    id TEXT PRIMARY KEY,
    agent_id TEXT NOT NULL,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL,
    FOREIGN KEY (agent_id) REFERENCES agents(id) ON DELETE CASCADE
);

-- Messages table
CREATE TABLE IF NOT EXISTS messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id TEXT NOT NULL,
    seq INTEGER NOT NULL,
    content TEXT NOT NULL,
    created_at TEXT NOT NULL,
    FOREIGN KEY (session_id) REFERENCES sessions(id) ON DELETE CASCADE,
    UNIQUE(session_id, seq)
);

-- KV Store table
CREATE TABLE IF NOT EXISTS kv_store (
    agent_id TEXT NOT NULL,
    key TEXT NOT NULL,
    value TEXT NOT NULL,
    updated_at TEXT NOT NULL,
    PRIMARY KEY (agent_id, key),
    FOREIGN KEY (agent_id) REFERENCES agents(id) ON DELETE CASCADE
);

-- Schema version table
CREATE TABLE IF NOT EXISTS schema_version (
    version INTEGER PRIMARY KEY
);

-- Hand execution runs table
CREATE TABLE IF NOT EXISTS hand_runs (
    id TEXT PRIMARY KEY,
    hand_name TEXT NOT NULL,
    trigger_source TEXT NOT NULL,
    params TEXT NOT NULL,
    status TEXT NOT NULL DEFAULT 'pending',
    result TEXT,
    error TEXT,
    duration_ms INTEGER,
    created_at TEXT NOT NULL,
    started_at TEXT,
    completed_at TEXT
);

-- Indexes
CREATE INDEX IF NOT EXISTS idx_sessions_agent ON sessions(agent_id);
CREATE INDEX IF NOT EXISTS idx_messages_session ON messages(session_id);
CREATE INDEX IF NOT EXISTS idx_kv_agent ON kv_store(agent_id);
CREATE INDEX IF NOT EXISTS idx_hand_runs_hand ON hand_runs(hand_name);
CREATE INDEX IF NOT EXISTS idx_hand_runs_status ON hand_runs(status);
CREATE INDEX IF NOT EXISTS idx_hand_runs_created ON hand_runs(created_at);

-- Structured facts table (extracted from conversations)
CREATE TABLE IF NOT EXISTS facts (
    id TEXT PRIMARY KEY,
    agent_id TEXT NOT NULL,
    content TEXT NOT NULL,
    category TEXT NOT NULL,
    confidence REAL NOT NULL,
    source_session TEXT,
    created_at INTEGER NOT NULL,
    FOREIGN KEY (agent_id) REFERENCES agents(id) ON DELETE CASCADE
);
CREATE INDEX IF NOT EXISTS idx_facts_agent ON facts(agent_id);
CREATE INDEX IF NOT EXISTS idx_facts_category ON facts(agent_id, category);
CREATE INDEX IF NOT EXISTS idx_facts_confidence ON facts(agent_id, confidence DESC);
"#;

/// Incremental migrations (safe to run repeatedly via ALTER … ADD COLUMN + IF NOT EXISTS pattern)
pub const MIGRATIONS: &[&str] = &[
    // v1→v2: persist runtime state and message count
    "ALTER TABLE agents ADD COLUMN state TEXT NOT NULL DEFAULT 'running'",
    "ALTER TABLE agents ADD COLUMN message_count INTEGER NOT NULL DEFAULT 0",
];