// Synops SpacetimeDB-modul
//
// Speiler PG-skjema (nodes + edges) som sanntids-cache.
// PG er autoritativ; SpacetimeDB er varm cache for frontend.
// Maskinrommet gjør warmup (PG → ST) ved oppstart og toveissynk deretter.
//
// Ref: docs/retninger/datalaget.md, docs/primitiver/nodes.md, docs/primitiver/edges.md

use spacetimedb::{reducer, Table, ReducerContext, Timestamp};

// =============================================================================
// Tabeller
// =============================================================================

/// Speiler PG nodes-tabellen. UUID-er representeres som String.
/// visibility og node_kind er strenger (PG-enums har ikke STDB-ekvivalent).
/// metadata er JSON-streng (PG JSONB).
#[spacetimedb::table(accessor = node, public)]
pub struct Node {
    #[primary_key]
    pub id: String,

    pub node_kind: String,
    pub title: String,
    pub content: String,
    pub visibility: String,
    pub metadata: String,
    pub created_at: Timestamp,
    pub created_by: String,
}

/// Speiler PG edges-tabellen.
#[spacetimedb::table(accessor = edge, public)]
pub struct Edge {
    #[primary_key]
    pub id: String,

    #[index(btree)]
    pub source_id: String,
    #[index(btree)]
    pub target_id: String,
    pub edge_type: String,
    pub metadata: String,
    pub system: bool,
    pub created_at: Timestamp,
    pub created_by: String,
}

// =============================================================================
// Livssyklus
// =============================================================================

#[reducer(init)]
pub fn init(_ctx: &ReducerContext) {
    log::info!("Synops-modul initialisert");
}

#[reducer(client_connected)]
pub fn client_connected(ctx: &ReducerContext) {
    log::info!("Klient tilkoblet: {}", ctx.sender().to_hex());
}

#[reducer(client_disconnected)]
pub fn client_disconnected(ctx: &ReducerContext) {
    log::info!("Klient frakoblet: {}", ctx.sender().to_hex());
}

// =============================================================================
// Node CRUD
// =============================================================================

#[reducer]
pub fn create_node(
    ctx: &ReducerContext,
    id: String,
    node_kind: String,
    title: String,
    content: String,
    visibility: String,
    metadata: String,
    created_by: String,
) -> Result<(), String> {
    if id.is_empty() {
        return Err("id kan ikke være tom".into());
    }
    if ctx.db.node().id().find(&id).is_some() {
        return Err(format!("Node med id {} finnes allerede", id));
    }

    ctx.db.node().insert(Node {
        id,
        node_kind,
        title,
        content,
        visibility,
        metadata,
        created_at: ctx.timestamp,
        created_by,
    });
    Ok(())
}

#[reducer]
pub fn update_node(
    ctx: &ReducerContext,
    id: String,
    node_kind: String,
    title: String,
    content: String,
    visibility: String,
    metadata: String,
) -> Result<(), String> {
    let existing = ctx.db.node().id().find(&id)
        .ok_or_else(|| format!("Node {} ikke funnet", id))?;

    ctx.db.node().id().update(Node {
        node_kind,
        title,
        content,
        visibility,
        metadata,
        ..existing
    });
    Ok(())
}

#[reducer]
pub fn delete_node(ctx: &ReducerContext, id: String) -> Result<(), String> {
    // Slett tilhørende edges først (speiler PG ON DELETE CASCADE)
    let source_edges: Vec<_> = ctx.db.edge().source_id().filter(&id).collect();
    for e in source_edges {
        ctx.db.edge().id().delete(&e.id);
    }
    let target_edges: Vec<_> = ctx.db.edge().target_id().filter(&id).collect();
    for e in target_edges {
        ctx.db.edge().id().delete(&e.id);
    }

    ctx.db.node().id().delete(&id);
    Ok(())
}

// =============================================================================
// Edge CRUD
// =============================================================================

#[reducer]
pub fn create_edge(
    ctx: &ReducerContext,
    id: String,
    source_id: String,
    target_id: String,
    edge_type: String,
    metadata: String,
    system: bool,
    created_by: String,
) -> Result<(), String> {
    if id.is_empty() {
        return Err("id kan ikke være tom".into());
    }
    if ctx.db.edge().id().find(&id).is_some() {
        return Err(format!("Edge med id {} finnes allerede", id));
    }

    ctx.db.edge().insert(Edge {
        id,
        source_id,
        target_id,
        edge_type,
        metadata,
        system,
        created_at: ctx.timestamp,
        created_by,
    });
    Ok(())
}

#[reducer]
pub fn update_edge(
    ctx: &ReducerContext,
    id: String,
    edge_type: String,
    metadata: String,
) -> Result<(), String> {
    let existing = ctx.db.edge().id().find(&id)
        .ok_or_else(|| format!("Edge {} ikke funnet", id))?;

    ctx.db.edge().id().update(Edge {
        edge_type,
        metadata,
        ..existing
    });
    Ok(())
}

#[reducer]
pub fn delete_edge(ctx: &ReducerContext, id: String) -> Result<(), String> {
    ctx.db.edge().id().delete(&id);
    Ok(())
}

// =============================================================================
// Warmup/vedlikehold
// =============================================================================

/// Tøm alle noder og edges (brukes ved restart/warmup for å unngå duplikater)
#[reducer]
pub fn clear_all(ctx: &ReducerContext) -> Result<(), String> {
    let all_edges: Vec<_> = ctx.db.edge().iter().collect();
    for e in all_edges {
        ctx.db.edge().id().delete(&e.id);
    }
    let all_nodes: Vec<_> = ctx.db.node().iter().collect();
    for n in all_nodes {
        ctx.db.node().id().delete(&n.id);
    }
    log::info!("Alle noder og edges slettet (clear_all)");
    Ok(())
}