// 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 node_access-tabellen (materialisert tilgangsmatrise).
/// subject_id = bruker/team, object_id = noden det gis tilgang til.
/// Brukes av frontend for visibility-filtrering.
#[spacetimedb::table(accessor = node_access, public)]
pub struct NodeAccess {
    #[primary_key]
    pub id: String, // "{subject_id}:{object_id}" — kompositt-nøkkel som streng

    #[index(btree)]
    pub subject_id: String,
    #[index(btree)]
    pub object_id: String,
    pub access: String, // reader, member, admin, owner
    pub via_edge: 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(())
}

// =============================================================================
// NodeAccess CRUD
// =============================================================================

/// Upsert: opprett eller oppdater tilgang. id = "{subject_id}:{object_id}".
#[reducer]
pub fn upsert_node_access(
    ctx: &ReducerContext,
    subject_id: String,
    object_id: String,
    access: String,
    via_edge: String,
) -> Result<(), String> {
    let id = format!("{subject_id}:{object_id}");

    if let Some(existing) = ctx.db.node_access().id().find(&id) {
        ctx.db.node_access().id().update(NodeAccess {
            access,
            via_edge,
            ..existing
        });
    } else {
        ctx.db.node_access().insert(NodeAccess {
            id,
            subject_id,
            object_id,
            access,
            via_edge,
        });
    }
    Ok(())
}

/// Slett en spesifikk tilgangsrad.
#[reducer]
pub fn delete_node_access(
    ctx: &ReducerContext,
    subject_id: String,
    object_id: String,
) -> Result<(), String> {
    let id = format!("{subject_id}:{object_id}");
    ctx.db.node_access().id().delete(&id);
    Ok(())
}

/// Slett all tilgang for et gitt subject (brukes ved fjerning av bruker/team).
#[reducer]
pub fn delete_node_access_for_subject(
    ctx: &ReducerContext,
    subject_id: String,
) -> Result<(), String> {
    let entries: Vec<_> = ctx.db.node_access().subject_id().filter(&subject_id).collect();
    for entry in entries {
        ctx.db.node_access().id().delete(&entry.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(())
}

// =============================================================================
// Live-rom (sanntidslyd via LiveKit)
// =============================================================================

/// Aktive LiveKit-rom knyttet til kommunikasjonsnoder.
/// Transient — finnes bare mens rommet er aktivt.
#[spacetimedb::table(accessor = live_room, public)]
pub struct LiveRoom {
    #[primary_key]
    pub room_id: String, // "communication_{uuid}"

    #[index(btree)]
    pub communication_id: String,
    pub is_active: bool,
    pub started_at: Timestamp,
    pub participant_count: u32,
}

/// Deltakere i aktive LiveKit-rom.
#[spacetimedb::table(accessor = room_participant, public)]
pub struct RoomParticipant {
    #[primary_key]
    pub id: String, // "{room_id}:{user_id}"

    #[index(btree)]
    pub room_id: String,
    #[index(btree)]
    pub user_id: String,
    pub display_name: String,
    pub role: String, // "publisher" | "subscriber"
    pub joined_at: Timestamp,
}

#[reducer]
pub fn create_live_room(
    ctx: &ReducerContext,
    room_id: String,
    communication_id: String,
) -> Result<(), String> {
    if room_id.is_empty() {
        return Err("room_id kan ikke være tom".into());
    }
    // Idempotent — hvis rommet allerede finnes, oppdater
    if let Some(existing) = ctx.db.live_room().room_id().find(&room_id) {
        ctx.db.live_room().room_id().update(LiveRoom {
            is_active: true,
            ..existing
        });
        return Ok(());
    }
    ctx.db.live_room().insert(LiveRoom {
        room_id,
        communication_id,
        is_active: true,
        started_at: ctx.timestamp,
        participant_count: 0,
    });
    Ok(())
}

#[reducer]
pub fn add_room_participant(
    ctx: &ReducerContext,
    room_id: String,
    user_id: String,
    display_name: String,
    role: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{user_id}");

    // Idempotent — oppdater hvis allerede finnes
    if let Some(existing) = ctx.db.room_participant().id().find(&id) {
        ctx.db.room_participant().id().update(RoomParticipant {
            display_name,
            role,
            ..existing
        });
        return Ok(());
    }

    ctx.db.room_participant().insert(RoomParticipant {
        id,
        room_id: room_id.clone(),
        user_id,
        display_name,
        role,
        joined_at: ctx.timestamp,
    });

    // Oppdater deltakertelling
    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
        ctx.db.live_room().room_id().update(LiveRoom {
            participant_count: room.participant_count + 1,
            ..room
        });
    }
    Ok(())
}

#[reducer]
pub fn remove_room_participant(
    ctx: &ReducerContext,
    room_id: String,
    user_id: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{user_id}");
    ctx.db.room_participant().id().delete(&id);

    // Oppdater deltakertelling
    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
        let new_count = room.participant_count.saturating_sub(1);
        ctx.db.live_room().room_id().update(LiveRoom {
            participant_count: new_count,
            ..room
        });
    }
    Ok(())
}

#[reducer]
pub fn close_live_room(
    ctx: &ReducerContext,
    room_id: String,
) -> Result<(), String> {
    // Fjern alle deltakere
    let participants: Vec<_> = ctx.db.room_participant().room_id().filter(&room_id).collect();
    for p in participants {
        ctx.db.room_participant().id().delete(&p.id);
    }

    // Marker rommet som inaktivt
    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
        ctx.db.live_room().room_id().update(LiveRoom {
            is_active: false,
            participant_count: 0,
            ..room
        });
    }
    Ok(())
}

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

/// Tøm alle noder, edges og node_access (brukes ved restart/warmup for å unngå duplikater)
#[reducer]
pub fn clear_all(ctx: &ReducerContext) -> Result<(), String> {
    let all_access: Vec<_> = ctx.db.node_access().iter().collect();
    for a in all_access {
        ctx.db.node_access().id().delete(&a.id);
    }
    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, edges og node_access slettet (clear_all)");
    Ok(())
}