use crate::types::*;
use core::default::Default;

/* arch .h*/
pub const SE_PAGE_SIZE: usize = 0x1000;
pub const SE_KEY_SIZE: usize = 384;
pub const SE_EXPONENT_SIZE: usize = 4;

/* arch.h */
#[repr(C, packed)]
pub struct tcs_t {
    pub reserved0: u64,
    pub flags: u64,
    pub ossa: u64,
    pub cssa: u32,
    pub nssa: u32,
    pub oentry: u64,
    pub reserved1: u64,
    pub ofs_base: u64,
    pub ogs_base: u64,
    pub ofs_limit: u32,
    pub ogs_limit: u32,
    pub reserved: [u8; 4024],
}

/* arch.h */
#[repr(C, packed)]
pub struct css_header_t {
    pub header: [u8; 12],
    pub css_type: u32, // type
    pub module_vendor: u32,
    pub date: u32,
    pub header2: [u8; 16],
    pub hw_version: u32,
    pub reserved: [u8; 84],
}

#[repr(C, packed)]
pub struct css_key_t {
    pub modulus: [u8; SE_KEY_SIZE],
    pub exponent: [u8; SE_EXPONENT_SIZE],
    pub signature: [u8; SE_KEY_SIZE],
}

#[repr(C, packed)]
pub struct css_body_t {
    pub misc_select: sgx_misc_select_t,
    pub misc_mask: sgx_misc_select_t,
    pub reserved: [u8; 4],
    pub isv_family_id: sgx_isvfamily_id_t,
    pub attributes: sgx_attributes_t,
    pub attribute_mask: sgx_attributes_t,
    pub enclave_hash: sgx_measurement_t,
    pub reserved2: [u8; 16],
    pub isvext_prod_id: sgx_isvext_prod_id_t,
    pub isv_prod_id: u16,
    pub isv_svn: u16,
}

#[repr(C, packed)]
pub struct css_buffer_t {
    pub reserved: [u8; 12],
    pub q1: [u8; SE_KEY_SIZE],
    pub q2: [u8; SE_KEY_SIZE],
}

#[repr(C, packed)]
pub struct enclave_css_t {
    pub header: css_header_t,
    pub key: css_key_t,
    pub body: css_body_t,
    pub buffer: css_buffer_t,
}

/* version of metadata */
/* based on 2.18 */
pub const MAJOR_VERSION: u32 = 3;
pub const MINOR_VERSION: u32 = 0;

pub const SGX_2_ELRANGE_MAJOR_VERSION: u32 = 13;
pub const SGX_1_ELRANGE_MAJOR_VERSION: u32 = 11;
pub const SGX_MAJOR_VERSION_GAP: u32 = 10;

pub const SGX_2_1_MAJOR_VERSION: u32 = 2; //MAJOR_VERSION should not larger than 0ffffffff
pub const SGX_2_1_MINOR_VERSION: u32 = 2; //MINOR_VERSION should not larger than 0ffffffff
pub const SGX_2_0_MAJOR_VERSION: u32 = 2; //MAJOR_VERSION should not larger than 0ffffffff
pub const SGX_2_0_MINOR_VERSION: u32 = 1; //MINOR_VERSION should not larger than 0ffffffff
pub const SGX_1_9_MAJOR_VERSION: u32 = 1; //MAJOR_VERSION should not larger than 0ffffffff
pub const SGX_1_9_MINOR_VERSION: u32 = 4; //MINOR_VERSION should not larger than 0ffffffff
pub const SGX_1_5_MAJOR_VERSION: u32 = 1; //MAJOR_VERSION should not larger than 0ffffffff
pub const SGX_1_5_MINOR_VERSION: u32 = 3; //MINOR_VERSION should not larger than 0ffffffff

pub const METADATA_MAGIC: u64 = 0x86A8_0294_635D_0E4C;
pub const METADATA_SIZE: usize = 0x5000;
pub const TCS_TEMPLATE_SIZE: usize = 72;

pub const TCS_POLICY_BIND: u32 = 0x0000_0000; /* If set, the TCS is bound to the application thread */
pub const TCS_POLICY_UNBIND: u32 = 0x0000_0001;

pub const MAX_SAVE_BUF_SIZE: u32 = 2632;
pub const TCS_NUM_MIN: u32 = 1;
pub const SSA_NUM_MIN: u32 = 2;
pub const SSA_FRAME_SIZE_MIN: u32 = 1;
pub const SSA_FRAME_SIZE_MAX: u32 = 4;
pub const STACK_SIZE_MIN: u32 = 0x0000_2000; // 8 KB
pub const STACK_SIZE_MAX: u32 = 0x0004_0000; // 256 KB
pub const HEAP_SIZE_MIN: u32 = 0x0000_1000; // 4 KB
pub const HEAP_SIZE_MAX: u32 = 0x0100_0000; // 16 MB
pub const RSRV_SIZE_MIN: u32 = 0x0000_0000; // 0 KB
pub const RSRV_SIZE_MAX: u32 = 0x0000_0000; // 0 KB
pub const USER_REGION_SIZE: u32 = 0x0000_0000; // 0 KB
pub const DEFAULT_MISC_SELECT: u32 = 0;
pub const DEFAULT_MISC_MASK: u32 = 0xFFFF_FFFF;
pub const ISVFAMILYID_MAX: u64 = 0xFFFF_FFFF_FFFF_FFFF;
pub const ISVEXTPRODID_MAX: u64 = 0xFFFF_FFFF_FFFF_FFFF;

pub const STATIC_STACK_SIZE: usize = 688;
pub const SE_GUARD_PAGE_SHIFT: usize = 16;
pub const SE_GUARD_PAGE_SIZE: usize = 1 << SE_GUARD_PAGE_SHIFT;

impl_packed_struct! {
    pub struct data_directory_t {
        pub offset :u32,
        pub size :u32,
    }
}

impl_enum! {
    #[repr(u32)]
    #[derive(Copy, Clone, PartialEq, Eq, Debug)]
    pub enum dir_index_t {
        DIR_PATCH  = 0,
        DIR_LAYOUT = 1,
        DIR_NUM    = 2,
    }
}

pub const GROUP_FLAG: u32 = 1 << 12;
pub const LAYOUT_ID_HEAP_MIN: u32 = 1;
pub const LAYOUT_ID_HEAP_INIT: u32 = 2;
pub const LAYOUT_ID_HEAP_MAX: u32 = 3;
pub const LAYOUT_ID_TCS: u32 = 4;
pub const LAYOUT_ID_TD: u32 = 5;
pub const LAYOUT_ID_SSA: u32 = 6;
pub const LAYOUT_ID_STACK_MAX: u32 = 7;
pub const LAYOUT_ID_STACK_MIN: u32 = 8;
pub const LAYOUT_ID_THREAD_GROUP: u32 = group_id!(9);
pub const LAYOUT_ID_GUARD: u32 = 10;
pub const LAYOUT_ID_HEAP_DYN_MIN: u32 = 11;
pub const LAYOUT_ID_HEAP_DYN_INIT: u32 = 12;
pub const LAYOUT_ID_HEAP_DYN_MAX: u32 = 13;
pub const LAYOUT_ID_TCS_DYN: u32 = 14;
pub const LAYOUT_ID_TD_DYN: u32 = 15;
pub const LAYOUT_ID_SSA_DYN: u32 = 16;
pub const LAYOUT_ID_STACK_DYN_MAX: u32 = 17;
pub const LAYOUT_ID_STACK_DYN_MIN: u32 = 18;
pub const LAYOUT_ID_THREAD_GROUP_DYN: u32 = group_id!(19);
pub const LAYOUT_ID_RSRV_MIN: u32 = 20;
pub const LAYOUT_ID_RSRV_INIT: u32 = 21;
pub const LAYOUT_ID_RSRV_MAX: u32 = 22;
pub const LAYOUT_ID_USER_REGION: u32 = 23;

type si_flags_t = u64;

impl_packed_struct! {
    pub struct layout_entry_t {
        pub id: u16,
        pub attributes: u16,
        pub page_count: u32,
        pub rva: u64,
        pub content_size: u32,
        pub content_offset: u32,
        pub si_flags: si_flags_t,
    }

    pub struct layout_group_t {
        pub id: u16,
        pub entry_count: u16,
        pub load_times: u32,
        pub load_step: u64,
        pub reserved: [u32; 4],
    }

    pub struct elrange_config_entry_t {
        pub enclave_image_address: u64,
        pub elrange_start_address: u64,
        pub elrange_size: u64,
    }
}

#[allow(unused)]
#[repr(C, packed)]
pub union layout_t {
    pub entry: layout_entry_t,
    pub group: layout_group_t,
}

#[repr(C, packed)]
pub struct patch_entry_t {
    pub dst: u64,
    pub src: u32,
    pub size: u32,
    pub reserved: [u32; 4],
}

#[repr(C, packed)]
pub struct metadata_t {
    pub magic_num: u64,
    pub version: u64,
    pub size: u32,
    pub tcs_policy: u32,
    pub ssa_frame_size: u32,
    pub max_save_buffer_size: u32,
    pub desired_misc_select: u32,
    pub tcs_min_pool: u32,
    pub enclave_size: u64,
    pub attributes: sgx_attributes_t,
    pub enclave_css: enclave_css_t,
    pub dirs: [data_directory_t; dir_index_t::DIR_NUM as usize],
    pub data: [u8; 18592],
}

/* based on 2.9.1 */
/* se_page_attr.h */
pub const PAGE_ATTR_EADD: u16 = 1 << 0;
pub const PAGE_ATTR_EEXTEND: u16 = 1 << 1;
pub const PAGE_ATTR_EREMOVE: u16 = 1 << 2;
pub const PAGE_ATTR_POST_ADD: u16 = 1 << 3;
pub const PAGE_ATTR_POST_REMOVE: u16 = 1 << 4;
pub const PAGE_ATTR_DYN_THREAD: u16 = 1 << 5;
pub const PAGE_DIR_GROW_DOWN: u16 = 1 << 6;
pub const ADD_PAGE_ONLY: u16 = PAGE_ATTR_EADD;
pub const ADD_EXTEND_PAGE: u16 = PAGE_ATTR_EADD | PAGE_ATTR_EEXTEND;
pub const PAGE_ATTR_MASK: u16 = !(PAGE_ATTR_EADD
    | PAGE_ATTR_EEXTEND
    | PAGE_ATTR_EREMOVE
    | PAGE_ATTR_POST_ADD
    | PAGE_ATTR_POST_REMOVE
    | PAGE_ATTR_DYN_THREAD
    | PAGE_DIR_GROW_DOWN);

/* based on 2.9.1 */
/* arch.h */
pub const SI_FLAG_NONE: u64 = 0x0;
pub const SI_FLAG_R: u64 = 0x1; /* Read Access */
pub const SI_FLAG_W: u64 = 0x2; /* Write Access */
pub const SI_FLAG_X: u64 = 0x4; /* Execute Access */
pub const SI_FLAG_PT_LOW_BIT: u64 = 0x8; /* PT low bit */
pub const SI_FLAG_PT_MASK: u64 = 0xFF << SI_FLAG_PT_LOW_BIT; /* Page Type Mask [15:8] */
pub const SI_FLAG_SECS: u64 = 0x00 << SI_FLAG_PT_LOW_BIT; /* SECS */
pub const SI_FLAG_TCS: u64 = 0x01 << SI_FLAG_PT_LOW_BIT; /* TCS */
pub const SI_FLAG_REG: u64 = 0x02 << SI_FLAG_PT_LOW_BIT; /* Regular Page */
pub const SI_FLAG_TRIM: u64 = 0x04 << SI_FLAG_PT_LOW_BIT; /* Trim Page */
pub const SI_FLAG_PENDING: u64 = 0x8;
pub const SI_FLAG_MODIFIED: u64 = 0x10;
pub const SI_FLAG_PR: u64 = 0x20;

pub const SI_FLAGS_EXTERNAL: u64 = SI_FLAG_PT_MASK | SI_FLAG_R | SI_FLAG_W | SI_FLAG_X; /* Flags visible/usable by instructions */
pub const SI_FLAGS_R: u64 = SI_FLAG_R | SI_FLAG_REG;
pub const SI_FLAGS_RW: u64 = SI_FLAG_R | SI_FLAG_W | SI_FLAG_REG;
pub const SI_FLAGS_RX: u64 = SI_FLAG_R | SI_FLAG_X | SI_FLAG_REG;
pub const SI_FLAGS_RWX: u64 = SI_FLAG_R | SI_FLAG_W | SI_FLAG_X | SI_FLAG_REG;
pub const SI_FLAGS_TCS: u64 = SI_FLAG_TCS;
pub const SI_FLAGS_SECS: u64 = SI_FLAG_SECS;
pub const SI_MASK_TCS: u64 = SI_FLAG_PT_MASK;
pub const SI_MASK_MEM_ATTRIBUTE: u64 = 0x7;