package pdf

import "core:os"
import "core:fmt"

PDF_MAGIC :: "%PDF-"

Error :: enum {
    Ok,
    File_Read_Error,
    InvalidFile,
}

Document :: struct {
    version: string
}

open :: proc{
    open_file,
    open_bytes,
}

open_file :: proc(path: string) -> (doc: ^Document, err: Error) {
    data, read_err := os.read_entire_file(path, context.allocator)
    if read_err != nil {
        return nil, .File_Read_Error
    }

    return open_bytes(data)
}

open_bytes :: proc(data: []u8) -> (doc: ^Document, err: Error) {
    doc = new(Document)

    if string(data[:5]) != PDF_MAGIC {
        return nil, .InvalidFile
    }

    doc.version = string(data[5:5+3])

    return doc, nil
}

destroy_document :: proc(pdf: ^Document) {
    free(pdf)
}