// 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(())
}

// =============================================================================
// Plasseringsrelasjon (message_placements)
// =============================================================================

/// Sporer hvor meldinger vises på tvers av kontekster (chat, kanban, storyboard, etc.).
/// Sanntidskopi — PG er autoritativ, SpacetimeDB gir instant UI-oppdatering.
/// Synk: STDB → PG via sync-worker.
/// Ref: docs/features/universell_overfoering.md § 2, 5
#[spacetimedb::table(accessor = message_placement, public)]
pub struct MessagePlacement {
    #[primary_key]
    pub id: String,

    #[index(btree)]
    pub message_id: String,
    #[index(btree)]
    pub context_id: String,
    pub context_type: String, // 'chat', 'kanban', 'storyboard', 'calendar', 'notes'
    pub entered_at: Timestamp,
    pub position_json: String, // JSON-serialisert posisjon (null for chat, {x,y} for storyboard, etc.)
}

// =============================================================================
// Mixer-kanaler (delt mixer-kontroll via SpacetimeDB)
// =============================================================================

/// Delt mixer-state per kanal i et live-rom.
/// Transient — finnes bare mens rommet er aktivt.
/// Alle deltakere abonnerer og ser endringer i sanntid.
#[spacetimedb::table(accessor = mixer_channel, public)]
pub struct MixerChannel {
    #[primary_key]
    pub id: String, // "{room_id}:{target_user_id}"

    #[index(btree)]
    pub room_id: String,
    #[index(btree)]
    pub target_user_id: String,
    pub gain: f64, // 0.0–1.5
    pub is_muted: bool,
    pub active_effects: String, // JSON: {"fat_bottom": true, "robot": false, ...}
    pub role: String,           // "editor" | "viewer" — tilgangskontroll
    pub updated_by: String,
    pub updated_at: Timestamp,
}

// =============================================================================
// 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);
    }

    // Fjern alle mixer-kanaler for dette rommet
    let mixer_channels: Vec<_> = ctx.db.mixer_channel().room_id().filter(&room_id).collect();
    for mc in mixer_channels {
        ctx.db.mixer_channel().id().delete(&mc.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(())
}

// =============================================================================
// Mixer-kontroll reducers
// =============================================================================

/// Opprett eller oppdater en mixer-kanal med standardverdier.
#[reducer]
pub fn create_mixer_channel(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    updated_by: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");

    // Idempotent — oppdater hvis allerede finnes
    if let Some(existing) = ctx.db.mixer_channel().id().find(&id) {
        ctx.db.mixer_channel().id().update(MixerChannel {
            updated_by,
            updated_at: ctx.timestamp,
            ..existing
        });
        return Ok(());
    }

    ctx.db.mixer_channel().insert(MixerChannel {
        id,
        room_id,
        target_user_id,
        gain: 1.0,
        is_muted: false,
        active_effects: "{}".to_string(),
        role: "editor".to_string(),
        updated_by,
        updated_at: ctx.timestamp,
    });
    Ok(())
}

/// Sett gain (volum) for en mixer-kanal. Clampes til 0.0–1.5.
#[reducer]
pub fn set_gain(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    gain: f64,
    updated_by: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");
    let clamped = gain.clamp(0.0, 1.5);

    let existing = ctx.db.mixer_channel().id().find(&id)
        .ok_or_else(|| format!("Mixer-kanal {} ikke funnet", id))?;

    // Tilgangskontroll: viewer kan ikke endre
    if existing.role == "viewer" && existing.target_user_id != updated_by {
        return Err("Viewer kan ikke endre mixer-innstillinger".into());
    }

    ctx.db.mixer_channel().id().update(MixerChannel {
        gain: clamped,
        updated_by,
        updated_at: ctx.timestamp,
        ..existing
    });
    Ok(())
}

/// Sett mute-status for en mixer-kanal.
#[reducer]
pub fn set_mute(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    is_muted: bool,
    updated_by: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");

    let existing = ctx.db.mixer_channel().id().find(&id)
        .ok_or_else(|| format!("Mixer-kanal {} ikke funnet", id))?;

    if existing.role == "viewer" && existing.target_user_id != updated_by {
        return Err("Viewer kan ikke endre mixer-innstillinger".into());
    }

    ctx.db.mixer_channel().id().update(MixerChannel {
        is_muted,
        updated_by,
        updated_at: ctx.timestamp,
        ..existing
    });
    Ok(())
}

/// Toggle en effekt for en mixer-kanal. Effektnavnet slås av/på i active_effects JSON.
#[reducer]
pub fn toggle_effect(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    effect_name: String,
    updated_by: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");

    let existing = ctx.db.mixer_channel().id().find(&id)
        .ok_or_else(|| format!("Mixer-kanal {} ikke funnet", id))?;

    if existing.role == "viewer" && existing.target_user_id != updated_by {
        return Err("Viewer kan ikke endre mixer-innstillinger".into());
    }

    // Parse, toggle, serialize tilbake
    // Enkel JSON-håndtering uten serde (STDB-moduler er lette)
    let mut effects = existing.active_effects.clone();
    if effects.contains(&format!("\"{}\":true", effect_name)) {
        effects = effects.replace(
            &format!("\"{}\":true", effect_name),
            &format!("\"{}\":false", effect_name),
        );
    } else if effects.contains(&format!("\"{}\":false", effect_name)) {
        effects = effects.replace(
            &format!("\"{}\":false", effect_name),
            &format!("\"{}\":true", effect_name),
        );
    } else {
        // Effekten finnes ikke — legg til som aktiv
        if effects == "{}" {
            effects = format!("{{\"{}\":true}}", effect_name);
        } else {
            // Sett inn før siste }
            effects = effects.trim_end_matches('}').to_string()
                + &format!(",\"{}\":true}}", effect_name);
        }
    }

    ctx.db.mixer_channel().id().update(MixerChannel {
        active_effects: effects,
        updated_by,
        updated_at: ctx.timestamp,
        ..existing
    });
    Ok(())
}

/// Sett en numerisk effektparameter i active_effects JSON.
/// Brukes for stemmeeffekter (robot_freq, robot_depth, monster_pitch) som har
/// parameterverdier, ikke bare av/på. Nøkkelen settes til den gitte verdien.
#[reducer]
pub fn set_effect_param(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    param_name: String,
    value: f64,
    updated_by: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");

    let existing = ctx.db.mixer_channel().id().find(&id)
        .ok_or_else(|| format!("Mixer-kanal {} ikke funnet", id))?;

    if existing.role == "viewer" && existing.target_user_id != updated_by {
        return Err("Viewer kan ikke endre mixer-innstillinger".into());
    }

    let mut effects = existing.active_effects.clone();
    let param_pattern = format!("\"{}\":", param_name);

    if effects.contains(&param_pattern) {
        // Replace existing value — find the key and replace up to next comma or }
        if let Some(start) = effects.find(&param_pattern) {
            let value_start = start + param_pattern.len();
            // Find end of value (next comma or closing brace)
            let rest = &effects[value_start..];
            let value_end = rest.find(',').unwrap_or_else(|| rest.find('}').unwrap_or(rest.len()));
            effects = format!(
                "{}{}{}",
                &effects[..value_start],
                value,
                &effects[value_start + value_end..]
            );
        }
    } else {
        // Add new param
        if effects == "{}" {
            effects = format!("{{\"{}\":{}}}", param_name, value);
        } else {
            effects = effects.trim_end_matches('}').to_string()
                + &format!(",\"{}\":{}}}", param_name, value);
        }
    }

    ctx.db.mixer_channel().id().update(MixerChannel {
        active_effects: effects,
        updated_by,
        updated_at: ctx.timestamp,
        ..existing
    });
    Ok(())
}

/// Slett en mixer-kanal (når deltaker forlater rommet).
#[reducer]
pub fn delete_mixer_channel(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
) -> Result<(), String> {
    let id = format!("{room_id}:{target_user_id}");
    ctx.db.mixer_channel().id().delete(&id);
    Ok(())
}

/// Sett rolle (editor/viewer) for en mixer-kanal.
/// Bare eier/admin kan endre rolle.
#[reducer]
pub fn set_mixer_role(
    ctx: &ReducerContext,
    room_id: String,
    target_user_id: String,
    role: String,
    _updated_by: String,
) -> Result<(), String> {
    if role != "editor" && role != "viewer" {
        return Err(format!("Ugyldig rolle: {}. Bruk 'editor' eller 'viewer'", role));
    }

    let id = format!("{room_id}:{target_user_id}");
    let existing = ctx.db.mixer_channel().id().find(&id)
        .ok_or_else(|| format!("Mixer-kanal {} ikke funnet", id))?;

    ctx.db.mixer_channel().id().update(MixerChannel {
        role,
        updated_at: ctx.timestamp,
        ..existing
    });
    Ok(())
}

// =============================================================================
// Placement reducers
// =============================================================================

/// Plasser en melding i en kontekst. Idempotent — oppdaterer hvis
/// (message_id, context_type, context_id) allerede finnes.
#[reducer]
pub fn place_message(
    ctx: &ReducerContext,
    id: String,
    message_id: String,
    context_type: String,
    context_id: String,
    position_json: String,
) -> Result<(), String> {
    if id.is_empty() {
        return Err("id kan ikke være tom".into());
    }

    // Sjekk om plassering allerede finnes (upsert-semantikk)
    // Søk på message_id + context_id (context_type er implisitt i context_id)
    let existing: Option<MessagePlacement> = ctx.db.message_placement()
        .message_id()
        .filter(&message_id)
        .find(|p| p.context_type == context_type && p.context_id == context_id);

    if let Some(existing) = existing {
        ctx.db.message_placement().id().update(MessagePlacement {
            position_json,
            ..existing
        });
    } else {
        ctx.db.message_placement().insert(MessagePlacement {
            id,
            message_id,
            context_type,
            context_id,
            entered_at: ctx.timestamp,
            position_json,
        });
    }
    Ok(())
}

/// Fjern en meldings plassering fra en kontekst.
#[reducer]
pub fn remove_placement(
    ctx: &ReducerContext,
    message_id: String,
    context_type: String,
    context_id: String,
) -> Result<(), String> {
    let existing: Option<MessagePlacement> = ctx.db.message_placement()
        .message_id()
        .filter(&message_id)
        .find(|p| p.context_type == context_type && p.context_id == context_id);

    if let Some(placement) = existing {
        ctx.db.message_placement().id().delete(&placement.id);
    }
    Ok(())
}

/// Flytt en plassering på canvas (oppdater posisjon).
/// Brukes for storyboard, kanban-rekkefølge, kalender-dato, etc.
#[reducer]
pub fn move_on_canvas(
    ctx: &ReducerContext,
    placement_id: String,
    new_position_json: String,
) -> Result<(), String> {
    let existing = ctx.db.message_placement().id().find(&placement_id)
        .ok_or_else(|| format!("Plassering {} ikke funnet", placement_id))?;

    ctx.db.message_placement().id().update(MessagePlacement {
        position_json: new_position_json,
        ..existing
    });
    Ok(())
}

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

/// Tøm alle noder, edges, node_access og transiente data (brukes ved restart/warmup)
#[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);
    }
    // Rydd opp transiente data
    let all_mixer: Vec<_> = ctx.db.mixer_channel().iter().collect();
    for m in all_mixer {
        ctx.db.mixer_channel().id().delete(&m.id);
    }
    let all_placements: Vec<_> = ctx.db.message_placement().iter().collect();
    for p in all_placements {
        ctx.db.message_placement().id().delete(&p.id);
    }
    log::info!("Alle noder, edges, node_access, mixer_channels og message_placements slettet (clear_all)");
    Ok(())
}