use num::Complex;
use std::fmt::Error as FmtError;
use std::fmt::{Display, Formatter};

#[cfg(feature = "afserde")]
use serde::{Deserialize, Serialize};

/// Error codes
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum AfError {
    /// The function returned successfully
    SUCCESS = 0,
    // 100-199 Errors in environment
    /// The system or device ran out of memory
    ERR_NO_MEM = 101,
    /// There was an error in the device driver
    ERR_DRIVER = 102,
    /// There was an error with the runtime environment
    ERR_RUNTIME = 103,
    // 200-299 Errors in input parameters
    /// The input array is not a valid Array object
    ERR_INVALID_ARRAY = 201,
    /// One of the function arguments is incorrect
    ERR_ARG = 202,
    /// The size is incorrect
    ERR_SIZE = 203,
    /// The type is not suppported by this function
    ERR_TYPE = 204,
    /// The type of the input arrays are not compatible
    ERR_DIFF_TYPE = 205,
    /// Function does not support GFOR / batch mode
    ERR_BATCH = 207,
    /// Input does not belong to the current device
    ERR_DEVICE = 208,
    // 300-399 Errors for missing software features
    /// The option is not supported
    ERR_NOT_SUPPORTED = 301,
    /// This build of ArrayFire does not support this feature
    ERR_NOT_CONFIGURED = 302,
    // 400-499 Errors for missing hardware features
    /// This device does not support double
    ERR_NO_DBL = 401,
    /// This build of ArrayFire was not built with graphics or this device does
    /// not support graphics
    ERR_NO_GFX = 402,
    // 900-999 Errors from upstream libraries and runtimes
    /// There was an internal error either in ArrayFire or in a project
    /// upstream
    ERR_INTERNAL = 998,
    /// Unknown Error
    ERR_UNKNOWN = 999,
}

/// Compute/Acceleration Backend
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum Backend {
    /// Default backend order: OpenCL -> CUDA -> CPU
    DEFAULT = 0,
    /// CPU a.k.a sequential algorithms
    CPU = 1,
    /// CUDA Compute Backend
    CUDA = 2,
    /// OpenCL Compute Backend
    OPENCL = 4,
}

impl Display for Backend {
    fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
        let text = match *self {
            Backend::OPENCL => "OpenCL",
            Backend::CUDA => "Cuda",
            Backend::CPU => "CPU",
            Backend::DEFAULT => "Default",
        };
        write!(f, "{}", text)
    }
}

impl Display for AfError {
    fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
        let text = match *self {
            AfError::SUCCESS => "Function returned successfully",
            AfError::ERR_NO_MEM => "System or Device ran out of memory",
            AfError::ERR_DRIVER => "Error in the device driver",
            AfError::ERR_RUNTIME => "Error with the runtime environment",
            AfError::ERR_INVALID_ARRAY => "Iput Array is not a valid object",
            AfError::ERR_ARG => "One of the function arguments is incorrect",
            AfError::ERR_SIZE => "Size is incorrect",
            AfError::ERR_TYPE => "Type is not suppported by this function",
            AfError::ERR_DIFF_TYPE => "Type of the input arrays are not compatible",
            AfError::ERR_BATCH => "Function does not support GFOR / batch mode",
            AfError::ERR_DEVICE => "Input does not belong to the current device",
            AfError::ERR_NOT_SUPPORTED => "Unsupported operation/parameter option",
            AfError::ERR_NOT_CONFIGURED => "This build of ArrayFire does not support this feature",
            AfError::ERR_NO_DBL => "This device does not support double",
            AfError::ERR_NO_GFX => "This build of ArrayFire has no graphics support",
            AfError::ERR_INTERNAL => "Error either in ArrayFire or in a project upstream",
            AfError::ERR_UNKNOWN => "Unknown Error",
        };
        write!(f, "{}", text)
    }
}

/// Types of Array data type
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum DType {
    /// 32 bit float
    F32 = 0,
    /// 32 bit complex float
    C32 = 1,
    /// 64 bit float
    F64 = 2,
    /// 64 bit complex float
    C64 = 3,
    /// 8 bit boolean
    B8 = 4,
    /// 32 bit signed integer
    S32 = 5,
    /// 32 bit unsigned integer
    U32 = 6,
    /// 8 bit unsigned integer
    U8 = 7,
    /// 64 bit signed integer
    S64 = 8,
    /// 64 bit unsigned integer
    U64 = 9,
    /// 16 bit signed integer
    S16 = 10,
    /// 16 bit unsigned integer
    U16 = 11,
    /// 16 bit floating point
    F16 = 12,
}

/// Dictates the interpolation method to be used by a function
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum InterpType {
    /// Nearest Neighbor interpolation method
    NEAREST = 0,
    /// Linear interpolation method
    LINEAR = 1,
    /// Bilinear interpolation method
    BILINEAR = 2,
    /// Cubic interpolation method
    CUBIC = 3,
    /// Floor indexed
    LOWER = 4,
    /// Linear interpolation with cosine smoothing
    LINEAR_COSINE = 5,
    /// Bilinear interpolation with cosine smoothing
    BILINEAR_COSINE = 6,
    /// Bicubic interpolation
    BICUBIC = 7,
    /// Cubic interpolation with Catmull-Rom splines
    CUBIC_SPLINE = 8,
    /// Bicubic interpolation with Catmull-Rom splines
    BICUBIC_SPLINE = 9,
}

/// Helps determine how to pad kernels along borders
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum BorderType {
    /// Pad using zeros
    ZERO = 0,
    /// Pad using mirrored values along border
    SYMMETRIC = 1,

    /// Out of bound values are clamped to the edge
    CLAMP_TO_EDGE,

    /// Out of bound values are mapped to range of the dimension in cyclic fashion
    PERIODIC,
}

/// Used by `regions` function to identify type of connectivity
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum Connectivity {
    /// North-East-South-West (N-E-S-W) connectivity from given pixel/point
    FOUR = 4,
    /// N-NE-E-SE-S-SW-W-NW connectivity from given pixel/point
    EIGHT = 8,
}

/// Helps determine the size of output of convolution
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum ConvMode {
    /// Default convolution mode where output size is same as input size
    DEFAULT = 0,
    /// Output of convolution is expanded based on signal and filter sizes
    EXPAND = 1,
}

/// Helps determine if convolution is in Spatial or Frequency domain
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum ConvDomain {
    /// ArrayFire chooses whether the convolution will be in spatial domain or frequency domain
    AUTO = 0,
    /// Convoltion in spatial domain
    SPATIAL = 1,
    /// Convolution in frequency domain
    FREQUENCY = 2,
}

/// Error metric used by `matchTemplate` function
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum MatchType {
    /// Sum of Absolute Differences
    SAD = 0,
    /// Zero-mean Sum of Absolute Differences
    ZSAD = 1,
    /// Locally scaled Sum of Absolute Differences
    LSAD = 2,
    /// Sum of Squared Differences
    SSD = 3,
    /// Zero-mean Sum of Squared Differences
    ZSSD = 4,
    /// Localy scaled Sum of Squared Differences
    LSSD = 5,
    /// Normalized Cross Correlation
    NCC = 6,
    /// Zero-mean Normalized Cross Correlation
    ZNCC = 7,
    /// Sum of Hamming Distances
    SHD = 8,
}

/// Identify the color space of given image(Array)
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum ColorSpace {
    /// Grayscale color space
    GRAY = 0,
    /// Red-Green-Blue color space
    RGB = 1,
    /// Hue-Saturation-value color space
    HSV = 2,
}

/// Helps determine the type of a Matrix
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum MatProp {
    /// Default (no-op)
    NONE = 0,
    /// Data needs to be transposed
    TRANS = 1,
    /// Data needs to be conjugate transposed
    CTRANS = 2,
    /// Matrix is upper triangular
    CONJ = 4,
    /// Matrix needs to be conjugate
    UPPER = 32,
    /// Matrix is lower triangular
    LOWER = 64,
    /// Matrix diagonal has unitary values
    DIAGUNIT = 128,
    /// Matrix is symmetric
    SYM = 512,
    /// Matrix is positive definite
    POSDEF = 1024,
    /// Matrix is orthogonal
    ORTHOG = 2048,
    /// Matrix is tri-diagonal
    TRIDIAG = 4096,
    /// Matrix is block-diagonal
    BLOCKDIAG = 8192,
}

/// Norm type
#[allow(non_camel_case_types)]
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum NormType {
    /// Treats input as a vector and return sum of absolute values
    VECTOR_1 = 0,
    /// Treats input as vector and return max of absolute values
    VECTOR_INF = 1,
    /// Treats input as vector and returns euclidean norm
    VECTOR_2 = 2,
    /// Treats input as vector and returns the p-norm
    VECTOR_P = 3,
    /// Return the max of column sums
    MATRIX_1 = 4,
    /// Return the max of row sums
    MATRIX_INF = 5,
    /// Returns the max singular value (Currently not supported)
    MATRIX_2 = 6,
    /// Returns Lpq-norm
    MATRIX_L_PQ = 7,
}

/// Dictates what color map is used for Image rendering
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum ColorMap {
    /// Default color map is grayscale range [0-1]
    DEFAULT = 0,
    /// Visible spectrum color map
    SPECTRUM = 1,
    /// Colors
    COLORS = 2,
    /// Red hue map
    RED = 3,
    /// Mood color map
    MOOD = 4,
    /// Heat color map
    HEAT = 5,
    /// Blue hue map
    BLUE = 6,
}

/// YCbCr Standards
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum YCCStd {
    /// ITU-R BT.601 (formerly CCIR 601) standard
    YCC_601 = 601,
    /// ITU-R BT.709 standard
    YCC_709 = 709,
    /// ITU-R BT.2020 standard
    YCC_2020 = 2020,
}

/// Homography type
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum HomographyType {
    /// RANdom SAmple Consensus algorithm
    RANSAC = 0,
    /// Least Median of Squares
    LMEDS = 1,
}

/// Plotting markers
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum MarkerType {
    /// No marker
    NONE = 0,
    /// Pointer marker
    POINT = 1,
    /// Hollow circle marker
    CIRCLE = 2,
    /// Hollow Square marker
    SQUARE = 3,
    /// Hollow Triangle marker
    TRIANGLE = 4,
    /// Cross-hair marker
    CROSS = 5,
    /// Plus symbol marker
    PLUS = 6,
    /// Start symbol marker
    STAR = 7,
}

/// Image moment types
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum MomentType {
    /// Central moment of order (0 + 0)
    M00 = 1, // 1<<0
    /// Central moment of order (0 + 1)
    M01 = 2, // 1<<1
    /// Central moment of order (1 + 0)
    M10 = 4, // 1<<2
    /// Central moment of order (1 + 1)
    M11 = 8, // 1<<3
    /// All central moments of order (0,0), (0,1), (1,0) and (1,1)
    FIRST_ORDER = 1 | 1 << 1 | 1 << 2 | 1 << 3,
}

/// Sparse storage format type
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum SparseFormat {
    /// Dense format
    DENSE = 0,
    /// Compressed sparse row format
    CSR = 1,
    /// Compressed sparse coloumn format
    CSC = 2,
    /// Coordinate list (row, coloumn, value) tuples.
    COO = 3,
}

/// Binary operation types for generalized scan functions
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum BinaryOp {
    /// Addition operation
    ADD = 0,
    /// Multiplication operation
    MUL = 1,
    /// Minimum operation
    MIN = 2,
    /// Maximum operation
    MAX = 3,
}

/// Random engine types
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum RandomEngineType {
    ///Philox variant with N=4, W=32 and Rounds=10
    PHILOX_4X32_10 = 100,
    ///Threefry variant with N=2, W=32 and Rounds=16
    THREEFRY_2X32_16 = 200,
    ///Mersenne variant with MEXP = 11213
    MERSENNE_GP11213 = 300,
}

/// Default Philon RandomEngine that points to [PHILOX_4X32_10](./enum.RandomEngineType.html)
pub const PHILOX: RandomEngineType = RandomEngineType::PHILOX_4X32_10;
/// Default Threefry RandomEngine that points to [THREEFRY_2X32_16](./enum.RandomEngineType.html)
pub const THREEFRY: RandomEngineType = RandomEngineType::THREEFRY_2X32_16;
/// Default Mersenne RandomEngine that points to [MERSENNE_GP11213](./enum.RandomEngineType.html)
pub const MERSENNE: RandomEngineType = RandomEngineType::MERSENNE_GP11213;
/// Default RandomEngine that defaults to [PHILOX](./constant.PHILOX.html)
pub const DEFAULT_RANDOM_ENGINE: RandomEngineType = PHILOX;

#[cfg(feature = "afserde")]
#[derive(Serialize, Deserialize)]
#[serde(remote = "Complex")]
struct ComplexDef<T> {
    re: T,
    im: T,
}

/// Scalar value types
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum Scalar {
    /// 32 bit float
    F32(f32),
    /// 32 bit complex float
    #[cfg_attr(feature = "afserde", serde(with = "ComplexDef"))]
    C32(Complex<f32>),
    /// 64 bit float
    F64(f64),
    /// 64 bit complex float
    #[cfg_attr(feature = "afserde", serde(with = "ComplexDef"))]
    C64(Complex<f64>),
    /// 8 bit boolean
    B8(bool),
    /// 32 bit signed integer
    S32(i32),
    /// 32 bit unsigned integer
    U32(u32),
    /// 8 bit unsigned integer
    U8(u8),
    /// 64 bit signed integer
    S64(i64),
    /// 64 bit unsigned integer
    U64(u64),
    /// 16 bit signed integer
    S16(i16),
    /// 16 bit unsigned integer
    U16(u16),
}

/// Canny edge detector threshold operations types
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum CannyThresholdType {
    /// User has to define canny thresholds manually
    MANUAL = 0,
    /// Determine canny algorithm high threshold using Otsu algorithm automatically
    OTSU = 1,
}

/// Anisotropic diffusion flux equation types
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum DiffusionEq {
    /// Quadratic flux function
    QUADRATIC = 1,
    /// Exponential flux function
    EXPONENTIAL = 2,
    /// Default flux function, a.k.a exponential
    DEFAULT = 0,
}

/// Diffusion equation types
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum FluxFn {
    /// Quadratic flux function
    GRADIENT = 1,
    /// Modified curvature diffusion equation
    MCDE = 2,
    /// Default diffusion method, Gradient
    DEFAULT = 0,
}

/// topk function ordering
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum TopkFn {
    /// Top k min values
    MIN = 1,
    /// Top k max values
    MAX = 2,
    /// Default option(max)
    DEFAULT = 0,
}

/// Iterative Deconvolution Algorithm
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum IterativeDeconvAlgo {
    /// Land-Weber Algorithm
    LANDWEBER = 1,
    /// Richardson-Lucy Algorithm
    RICHARDSONLUCY = 2,
    /// Default is Land-Weber algorithm
    DEFAULT = 0,
}

/// Inverse Deconvolution Algorithm
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum InverseDeconvAlgo {
    /// Tikhonov algorithm
    TIKHONOV = 1,
    /// Default is Tikhonov algorithm
    DEFAULT = 0,
}

/// Gradient mode for convolution
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum ConvGradientType {
    /// Filter Gradient
    FILTER = 1,
    /// Data Gradient
    DATA = 2,
    /// Biased Gradient
    BIAS = 3,
    /// Default is Data Gradient
    DEFAULT = 0,
}

/// Gradient mode for convolution
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum VarianceBias {
    /// Sample variance
    SAMPLE = 1,
    /// Population variance
    POPULATION = 2,
    /// Default (Population) variance
    DEFAULT = 0,
}

/// Gradient mode for convolution
#[repr(u32)]
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "afserde", derive(Serialize, Deserialize))]
pub enum CublasMathMode {
    /// To indicate use of Tensor Cores on CUDA capable GPUs
    TENSOR_OP = 1,
    /// Default i.e. tensor core operations will be avoided by the library
    DEFAULT = 0,
}

#[cfg(test)]
mod tests {
    #[cfg(feature = "afserde")]
    mod serde_tests {
        #[test]
        fn test_enum_serde() {
            use super::super::AfError;

            let err_code = AfError::ERR_NO_MEM;
            let serd = match serde_json::to_string(&err_code) {
                Ok(serialized_str) => serialized_str,
                Err(e) => e.to_string(),
            };
            assert_eq!(serd, "\"ERR_NO_MEM\"");

            let deserd: AfError = serde_json::from_str(&serd).unwrap();
            assert_eq!(deserd, AfError::ERR_NO_MEM);
        }

        #[test]
        fn test_scalar_serde() {
            use super::super::Scalar;
            use num::Complex;

            let scalar = Scalar::C32(Complex {
                re: 1.0f32,
                im: 1.0f32,
            });
            let serd = match serde_json::to_string(&scalar) {
                Ok(serialized_str) => serialized_str,
                Err(e) => e.to_string(),
            };

            let deserd: Scalar = serde_json::from_str(&serd).unwrap();
            assert_eq!(deserd, scalar);
        }
    }
}