// Copyright (c) 2026 Ourpad Network
// See LICENSE file in the project root for full license text.

#pragma once

#include <cstdint>
#include <string>
#include <vector>

namespace mixer {

/// Types of buses in the mixer architecture.
enum class MixerBusType {
    Master,   // Main L/R output — end of signal chain
    Subgroup, // Named subgroup (Drums, Guitars, Vocals...)
    Aux,      // Aux send bus (monitor mix or FX send)
    FxReturn, // Stereo return from a shared FX processor (reverb, delay)
};

/// Channel type classification for mixer channel strips.
enum class MixerChannelType {
    Instrument,   // guitar, bass, keys — expects amp modeling
    Mic,          // vocal mic — expects compressor, EQ, reverb chain
    Line,         // line-level input (backing tracks, synths, drum machines)
    AuxReturn,    // return from external FX processor
};

/// Configuration for a single aux send on a channel strip.
struct AuxSendConfig {
    float level = -96.0f;      // dB, -96 ≈ -inf (effectively off)
    bool preFader = false;     // true = pre-fader (monitor send), false = post-fader (FX send)
    int64_t targetBusId = -1;  // bus ID this sends to

    bool isActive() const { return level > -90.0f && targetBusId >= 0; }
};

/// Per-channel high-pass filter configuration.
struct HpfConfig {
    bool enabled = false;
    float frequency = 80.0f;   // Hz
};

/// Routing entry: a source (channel or bus) feeds a target bus with a level.
struct MixerRouteEntry {
    enum SourceType {
        SourceChannel,
        SourceBus
    };

    SourceType sourceType;
    int64_t sourceId;       // channel instanceId or bus ID
    int64_t targetBusId;    // the bus being fed into
    float level = 0.0f;     // dB
};

/// Describes a mapping from a mixer bus to physical output channels.
struct MixerOutputRoute {
    int64_t sourceBusId;      // Bus to route from
    int sourceStartChannel;   // Starting channel on the bus (0=L, 1=R)
    int targetStartChannel;   // Starting physical output channel
    int channels;             // Number of consecutive channels to route (1 or 2 typically)
};

/// A complete snapshot of the mixer state for save/restore.
struct MixerSnapshot {
    struct ChannelState {
        int channelIndex;
        float volume;
        float pan;
        bool mute;
        bool solo;
        MixerChannelType channelType;
        std::string label;
        bool hpEnabled;
        float hpFrequency;
        std::vector<float> auxSendLevels; // indexed by aux bus index
    };
    struct BusState {
        int64_t id;
        std::string name;
        MixerBusType type;
        float volume;
        bool mute;
    };
    std::vector<ChannelState> channels;
    std::vector<BusState> buses;
    std::vector<MixerRouteEntry> routes;
};

} // namespace mixer