// This package contains all data that is saved on disc. So everything in the .ezs folder
package store

// .ezs directory structure
// .ezs/
//      backups/ -- Contains backups of old files
//              [a-zA-Z0-9\-_]{2}/ -- Custom Base64 encoded XXH3_128 prefix for the backups
//                                [HASH] -- The backed up file, the hash is used to identify it. What about collisions? We mention that in the data file next to it
//                                [HASH].ini -- The data file for file [HASH], contains things like filename and also collision data
//      superpositions/ -- Contains data about superpositions TODO: Define
//      config.ini -- Contains general config data

import "core:mem"
import "core:time"
import "core:encoding/base64"

Config_Backups :: struct {
    enabled:  bool          `ini:"default=true"`,
    interval: time.Duration `ini:"default=10m"`,
}

Config :: struct {
    backups: Config_Backups,
}

// Custom base64 tables

ENC_TABLE := [64]byte {
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
    'w', 'x', 'y', 'z', '0', '1', '2', '3',
    '4', '5', '6', '7', '8', '9', '-', '_',
}

DEC_TABLE := [128]int {
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, 62, -1, -1,
    52, 53, 54, 55, 56, 57, 58, 59,
    60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,
     7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22,
    23, 24, 25, -1, -1, -1, -1, 63,
    -1, 26, 27, 28, 29, 30, 31, 32,
    33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48,
    49, 50, 51, -1, -1, -1, -1, -1,
}

base64_encode :: proc(data: []byte, allocator := context.allocator) -> (encoded: string, err: mem.Allocator_Error) #optional_allocator_error {
    return base64.encode(data, ENC_TABLE, allocator)
}


base64_decode :: proc(data: string, allocator := context.allocator) -> (decoded: []byte, err: mem.Allocator_Error) #optional_allocator_error {
    return base64.decode(data, DEC_TABLE, allocator)
}