require "kemal"
require "../*"
require "io"
require "file"
require "exception"
require "crypto/bcrypt/password"
require "uuid"
require "uuid/json"
require "../../config"


def authenticate(user : String, token : UUID) : (User | Nil)
    user_file = User.from_json File.read(Statics.data_path+"user/"+user)
    if nil == user_file.tokens.not_nil!.find{ |tok| token == tok}
        nil
    else
        user_file.password_hash = ""
        user_file
    end
end

def authenticate!(user : String, token : UUID) : User
    authenticate(user, token).not_nil!
end

def authenticate_admin!(user : String, token : UUID) : User
    user = authenticate(user, token).not_nil!
    if(user.type==UserType::Administrator)
        return user
    end
    raise "Administrator only"
end

post "/login" do |context|
    user : User
    user_file : User
    begin
        user = User.from_json context.request.body.not_nil!
        user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    if Crypto::Bcrypt::Password.new(user_file.password_hash.not_nil!) == user.password_hash.not_nil!
    else
        halt context, status_code: 403, response: "Invalid password"
    end
    token = UUID.random()
    if user_file.tokens.nil?
        user_file.tokens = Array(UUID).new
        user_file.tokens.not_nil!<<token
    else
        user_file.tokens.not_nil!<<token
    end
    if user_file.tokens.not_nil!.size>5
        user_file.tokens = user_file.tokens.not_nil!.last(5)
    end
    File.write(Statics.data_path+"user/"+user_file.email,user_file.to_json)
    context.response.content_type = "application/json"
    token.to_json
end

post "/logout" do |context|
    user = User.from_json context.request.body.not_nil!
    user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
    user_file.tokens=user_file.tokens.not_nil!-user.tokens.not_nil!
    File.write(Statics.data_path+"user/"+user_file.email,user_file.to_json)
    context.response.content_type = "application/json"
    "OK".to_json
end

post "/logout-all" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
    user_file.tokens=Array(UUID).new
    File.write(Statics.data_path+"user/"+user_file.email,user_file.to_json)
    context.response.content_type = "application/json"
    "OK".to_json
end

post "/user" do |context|
    user = User.from_json context.request.body.not_nil!
    ph = user.password_hash
    user.tokens = Array(UUID).new
    user.invoices = Array(Invoice).new
    if ph.nil?
        raise Exception.new("No password provided")
    else
        user.password_hash=Crypto::Bcrypt::Password.create(ph,cost: 12).to_s
    end
    if Statics.email_regex.match(user.email)==nil
        raise Exception.new("Bad email address")
    end
    File.write(Statics.data_path+"user/"+user.email,user.to_json)
    context.response.content_type = "application/json"
    "OK".to_json
end

get "/user/tokens" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    context.response.content_type = "application/json"
    user.tokens.to_json
end

get "/user/address" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    context.response.content_type = "application/json"
    user.addresses.to_json
end

post "/user/address" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    addresses = Array(Address).from_json(context.request.body.not_nil!).not_nil!
    user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
    old_list=user_file.addresses
    if old_list.nil?
    else
        addresses=old_list+addresses
    end
    user_file.addresses=addresses
    File.write(Statics.data_path+"user/"+user.email,user_file.to_json)
    context.response.content_type = "application/json"
    "OK".to_json
end

delete "/user/address" do |context|
    user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    addresses = Array(Address).from_json(context.request.body.not_nil!).not_nil!
    user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
    old_list=user_file.addresses
    if old_list.nil?
        addresses=Array(Address).new
    else
        addresses=old_list-addresses
    end
    user_file.addresses=addresses
    File.write(Statics.data_path+"user/"+user.email,user_file.to_json)
    context.response.content_type = "application/json"
    "OK".to_json
end

get "/user" do |context|
    context.response.content_type = "application/json"
    user : User | Nil
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    user.not_nil!
end