plasma-prp 0.1.0

//! plAGAnim — animation clips holding named channels with applicators.
//!
//! C++ ref: plAnimation/plAGAnim.h/.cpp, plMatrixChannel.h/.cpp,
//!          plScalarChannel.h/.cpp, plPointChannel.h/.cpp, plQuatChannel.h/.cpp
//!
//! ## Binary Format for plAGAnim applicator list
//!
//! Each animation contains a list of applicator+channel pairs:
//! ```text
//! [u32 num_applicators]
//! For each pair:
//!   [Applicator creatable]   — u16 class_idx + applicator data
//!   [Channel creatable]      — u16 class_idx + channel data
//! ```
//!
//! ## Applicator format (plAGApplicator::Read, plAGApplicator.cpp:141-148)
//!
//! All applicator subclasses use the base Read with no additional fields:
//! ```text
//! u8       fEnabled
//! safe_str fChannelName        — target bone/node name
//! ```
//!
//! Applicator class indices (all share same binary format):
//!   0x030E  plMatrixChannelApplicator
//!   0x030F  plPointChannelApplicator
//!   0x0314  plQuatChannelApplicator
//!   0x0319  plScalarChannelApplicator
//!   0x0310  plLightDiffuseApplicator
//!   0x0311  plLightAmbientApplicator
//!   0x0312  plLightSpecularApplicator
//!   0x0313  plOmniApplicator
//!   0x031A  plSpotInnerApplicator
//!   0x031B  plSpotOuterApplicator
//!   0x03A8  plOmniCutoffApplicator
//!   0x022A  plOmniSqApplicator
//!
//! ## Channel formats (each starts with base plAGChannel::Read → safe_string fName)
//!
//! plMatrixControllerChannel (0x02DE):
//!   safe_str fName
//!   creatable fController      — plTMController/plCompoundController/plLeafController
//!   AffineParts fAP            — 15 floats (T:3f + Q:4f + U:4f + K:3f + F:1f)
//!
//! plMatrixConstant (0x0331):
//!   safe_str fName
//!   AffineParts fAP            — 15 floats (T:3f + Q:4f + U:4f + K:3f + F:1f)
//!
//! plScalarControllerChannel (0x0318):
//!   safe_str fName
//!   creatable fController      — plLeafController
//!
//! plScalarConstant (0x0330):
//!   safe_str fName
//!   f32 fResult
//!
//! plPointControllerChannel (0x030B):
//!   safe_str fName
//!   creatable fController      — plCompoundController/plLeafController
//!
//! plPointConstant (0x02E1):
//!   safe_str fName
//!   Point3 fResult             — 3 floats (x, y, z)
//!
//! plQuatConstant (0x02E4):
//!   safe_str fName
//!   Quat fResult               — 4 floats (x, y, z, w)
//!
//! ## hsAffineParts format (plTransform/hsAffineParts.cpp:417-425)
//!
//! ```text
//! hsVector3 fT   — Translation (3× f32 LE)
//! hsQuat    fQ   — Essential rotation (4× f32 LE: x, y, z, w)
//! hsQuat    fU   — Stretch rotation (4× f32 LE: x, y, z, w)
//! hsVector3 fK   — Stretch factors / scale (3× f32 LE)
//! float     fF   — Sign of determinant (1× f32 LE)
//! ```
//! Total: 15 floats = 60 bytes

use std::io::Read;

use anyhow::{Result, bail};

use crate::core::class_index::ClassIndex;
use crate::core::synched_object::SynchedObjectData;
use crate::core::uoid::{Uoid, read_key_uoid};
use crate::resource::prp::PlasmaRead;

use super::controller::Controller;

/// Body usage for animations.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(u8)]
pub enum BodyUsage {
    Unknown = 0,
    Upper = 1,
    Full = 2,
    Lower = 3,
}

impl BodyUsage {
    pub fn from_u8(v: u8) -> Self {
        match v {
            1 => Self::Upper,
            2 => Self::Full,
            3 => Self::Lower,
            _ => Self::Unknown,
        }
    }
}

/// Decomposed affine transform (hsAffineParts).
/// C++ ref: plTransform/hsAffineParts.h
#[derive(Debug, Clone)]
pub struct AffineParts {
    pub translation: [f32; 3],       // fT — translation
    pub rotation: [f32; 4],          // fQ — essential rotation (quaternion x,y,z,w)
    pub stretch_rotation: [f32; 4],  // fU — stretch rotation (quaternion)
    pub scale: [f32; 3],             // fK — stretch factors
    pub det_sign: f32,               // fF — sign of determinant
}

impl AffineParts {
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        Ok(Self {
            translation: [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?],
            rotation: [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?, reader.read_f32()?],
            stretch_rotation: [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?, reader.read_f32()?],
            scale: [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?],
            det_sign: reader.read_f32()?,
        })
    }
}

/// Channel data extracted from an animation applicator.
///
/// Each channel targets a named bone/node and contains either a controller
/// with keyframe data or a constant value.
#[derive(Debug, Clone)]
pub enum ChannelData {
    /// Matrix controller channel — drives a bone's transform via keyframes.
    /// Contains a plController + initial hsAffineParts rest pose.
    /// C++ ref: plMatrixControllerChannel (plMatrixChannel.cpp:596-604)
    MatrixController {
        controller: Option<Controller>,
        initial_pose: AffineParts,
    },
    /// Matrix constant — static bone transform with no animation.
    /// C++ ref: plMatrixConstant (plMatrixChannel.cpp:217-222)
    MatrixConstant {
        pose: AffineParts,
    },
    /// Scalar controller channel — drives a single float via keyframes.
    /// C++ ref: plScalarControllerChannel (plScalarChannel.cpp:379-384)
    ScalarController(Option<Controller>),
    /// Scalar constant — static float value.
    /// C++ ref: plScalarConstant (plScalarChannel.cpp:148-152)
    ScalarConstant(f32),
    /// Point controller channel — drives a 3D point via keyframes.
    /// C++ ref: plPointControllerChannel (plPointChannel.cpp:381-386)
    PointController(Option<Controller>),
    /// Point constant — static 3D point.
    /// C++ ref: plPointConstant (plPointChannel.cpp:132-136)
    PointConstant([f32; 3]),
    /// Quaternion constant — static rotation.
    /// C++ ref: plQuatConstant (plQuatChannel.cpp:147-151)
    QuatConstant([f32; 4]),
}

/// A channel-applicator pair in an animation.
///
/// The applicator routes a channel's output to a target (bone transform,
/// scalar property, etc.). The channel_name identifies the target bone.
///
/// C++ ref: plAGApplicator::Read (plAGApplicator.cpp:141-148)
#[derive(Debug, Clone)]
pub struct AnimApplicator {
    /// Applicator class index.
    pub applicator_class: u16,
    /// Channel name from the applicator (target bone/node name).
    pub channel_name: String,
    pub enabled: bool,
    /// Channel class index.
    pub channel_class: u16,
    /// Channel name from the channel's own data (fName from plAGChannel::Read).
    pub channel_name_from_channel: String,
    /// Parsed channel data including controller with keyframes.
    pub channel_data: ChannelData,
}

impl AnimApplicator {
    /// Read an applicator+channel pair from a stream.
    ///
    /// plAGAnim::Read serializes applicators and channels as interleaved
    /// creatable pairs: [applicator_creatable][channel_creatable] for each.
    /// C++ ref: plAGAnim.cpp:203-224
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        // === Read applicator creatable ===
        // All applicator subclasses use the same base plAGApplicator::Read:
        //   fEnabled (u8 bool), fChannelName (safe_string)
        // C++ ref: plAGApplicator.cpp:141-148
        let app_class = reader.read_u16()?;
        let (channel_name, enabled) = if app_class != 0x8000 {
            let enabled = reader.read_u8()? != 0;
            let name = reader.read_safe_string()?;
            (name, enabled)
        } else {
            (String::new(), false)
        };

        // === Read channel creatable ===
        // Dispatch on class index to read subclass-specific data.
        // All channels start with base plAGChannel::Read → safe_string fName.
        let chan_class = reader.read_u16()?;
        if chan_class == 0x8000 {
            return Ok(Self {
                applicator_class: app_class,
                channel_name,
                enabled,
                channel_class: 0x8000,
                channel_name_from_channel: String::new(),
                channel_data: ChannelData::ScalarConstant(0.0),
            });
        }

        // Base plAGChannel::Read — all channel types read fName first
        let channel_name_from_channel = reader.read_safe_string()?;

        let channel_data = match chan_class {
            // plMatrixControllerChannel (0x02DE):
            //   base name (already read) + controller creatable + AffineParts
            ClassIndex::PL_MATRIX_CONTROLLER_CHANNEL => {
                let controller = Controller::read_creatable(reader)?;
                let initial_pose = AffineParts::read(reader)?;
                ChannelData::MatrixController { controller, initial_pose }
            }

            // plMatrixConstant (0x0331):
            //   base name (already read) + AffineParts
            ClassIndex::PL_MATRIX_CONSTANT => {
                let pose = AffineParts::read(reader)?;
                ChannelData::MatrixConstant { pose }
            }

            // plScalarControllerChannel (0x0318):
            //   base name (already read) + controller creatable
            ClassIndex::PL_SCALAR_CONTROLLER_CHANNEL => {
                let controller = Controller::read_creatable(reader)?;
                ChannelData::ScalarController(controller)
            }

            // plScalarConstant (0x0330):
            //   base name (already read) + f32 value
            ClassIndex::PL_SCALAR_CONSTANT => {
                let value = reader.read_f32()?;
                ChannelData::ScalarConstant(value)
            }

            // plPointControllerChannel (0x030B):
            //   base name (already read) + controller creatable
            ClassIndex::PL_POINT_CONTROLLER_CHANNEL => {
                let controller = Controller::read_creatable(reader)?;
                ChannelData::PointController(controller)
            }

            // plPointConstant (0x02E1):
            //   base name (already read) + Point3 (3 floats)
            ClassIndex::PL_POINT_CONSTANT => {
                let value = [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?];
                ChannelData::PointConstant(value)
            }

            // plQuatConstant (0x02E4):
            //   base name (already read) + Quat (4 floats: x, y, z, w)
            ClassIndex::PL_QUAT_CONSTANT => {
                let value = [reader.read_f32()?, reader.read_f32()?, reader.read_f32()?, reader.read_f32()?];
                ChannelData::QuatConstant(value)
            }

            _ => {
                bail!("Unknown channel class 0x{:04X} ({}) for applicator '{}'",
                    chan_class,
                    ClassIndex::class_name(chan_class),
                    channel_name);
            }
        };

        Ok(Self {
            applicator_class: app_class,
            channel_name,
            enabled,
            channel_class: chan_class,
            channel_name_from_channel,
            channel_data,
        })
    }
}

/// Named time marker in an animation.
#[derive(Debug, Clone)]
pub struct AnimMarker {
    pub name: String,
    pub time: f32,
}

/// Named loop in an animation.
#[derive(Debug, Clone)]
pub struct AnimLoop {
    pub name: String,
    pub begin: f32,
    pub end: f32,
}

/// Parsed plAGAnim data (base animation clip).
#[derive(Debug, Clone)]
pub struct AGAnimData {
    pub self_key: Option<Uoid>,
    pub synched: SynchedObjectData,
    pub name: String,
    pub start: f32,
    pub end: f32,
    pub applicators: Vec<AnimApplicator>,
}

impl AGAnimData {
    /// Read a plAGAnim from a stream (after creatable class index).
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        let self_key = read_key_uoid(reader)?;
        let synched = SynchedObjectData::read(reader)?;

        let name = reader.read_safe_string()?;
        let start = reader.read_f32()?;
        let end = reader.read_f32()?;

        let num_apps = reader.read_u32()?;
        let mut applicators = Vec::with_capacity(num_apps as usize);
        for _ in 0..num_apps {
            applicators.push(AnimApplicator::read(reader)?);
        }

        Ok(Self {
            self_key,
            synched,
            name,
            start,
            end,
            applicators,
        })
    }
}

/// Parsed plATCAnim data (timed animation with looping, markers, etc.).
#[derive(Debug, Clone)]
pub struct ATCAnimData {
    pub base: AGAnimData,
    pub initial: f32,
    pub auto_start: bool,
    pub loop_start: f32,
    pub loop_end: f32,
    pub do_loop: bool,
    pub ease_in_type: u8,
    pub ease_in_min: f32,
    pub ease_in_max: f32,
    pub ease_in_length: f32,
    pub ease_out_type: u8,
    pub ease_out_min: f32,
    pub ease_out_max: f32,
    pub ease_out_length: f32,
    pub markers: Vec<AnimMarker>,
    pub loops: Vec<AnimLoop>,
    pub stop_points: Vec<f32>,
}

impl ATCAnimData {
    /// Read a plATCAnim from a stream (after creatable class index).
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        let base = AGAnimData::read(reader)?;

        let initial = reader.read_f32()?;
        let auto_start = reader.read_u8()? != 0;
        let loop_start = reader.read_f32()?;
        let loop_end = reader.read_f32()?;
        let do_loop = reader.read_u8()? != 0;

        let ease_in_type = reader.read_u8()?;
        let ease_in_min = reader.read_f32()?;
        let ease_in_max = reader.read_f32()?;
        let ease_in_length = reader.read_f32()?;
        let ease_out_type = reader.read_u8()?;
        let ease_out_min = reader.read_f32()?;
        let ease_out_max = reader.read_f32()?;
        let ease_out_length = reader.read_f32()?;

        let num_markers = reader.read_u32()?;
        let mut markers = Vec::with_capacity(num_markers as usize);
        for _ in 0..num_markers {
            markers.push(AnimMarker {
                name: reader.read_safe_string()?,
                time: reader.read_f32()?,
            });
        }

        let num_loops = reader.read_u32()?;
        let mut loops = Vec::with_capacity(num_loops as usize);
        for _ in 0..num_loops {
            loops.push(AnimLoop {
                name: reader.read_safe_string()?,
                begin: reader.read_f32()?,
                end: reader.read_f32()?,
            });
        }

        let num_stop_points = reader.read_u32()?;
        let mut stop_points = Vec::with_capacity(num_stop_points as usize);
        for _ in 0..num_stop_points {
            stop_points.push(reader.read_f32()?);
        }

        Ok(Self {
            base,
            initial,
            auto_start,
            loop_start,
            loop_end,
            do_loop,
            ease_in_type,
            ease_in_min,
            ease_in_max,
            ease_in_length,
            ease_out_type,
            ease_out_min,
            ease_out_max,
            ease_out_length,
            markers,
            loops,
            stop_points,
        })
    }
}

/// Parsed plEmoteAnim data.
#[derive(Debug, Clone)]
pub struct EmoteAnimData {
    pub base: ATCAnimData,
    pub fade_in: f32,
    pub fade_out: f32,
    pub body_usage: BodyUsage,
}

impl EmoteAnimData {
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        let base = ATCAnimData::read(reader)?;
        let fade_in = reader.read_f32()?;
        let fade_out = reader.read_f32()?;
        let body_usage = BodyUsage::from_u8(reader.read_u8()?);

        Ok(Self {
            base,
            fade_in,
            fade_out,
            body_usage,
        })
    }
}

/// Parsed plAgeGlobalAnim data.
#[derive(Debug, Clone)]
pub struct AgeGlobalAnimData {
    pub base: AGAnimData,
    pub global_var_name: String,
}

impl AgeGlobalAnimData {
    pub fn read(reader: &mut impl Read) -> Result<Self> {
        let base = AGAnimData::read(reader)?;
        let global_var_name = reader.read_safe_string()?;

        Ok(Self {
            base,
            global_var_name,
        })
    }
}