package config

import (
	"fmt"
	"io/ioutil"
	"net/url"

	"git.andreafazzi.eu/andrea/oef/reflect"
	yaml "gopkg.in/yaml.v2"
)

const (
	LOG_LEVEL_OFF = iota
	LOG_LEVEL_INFO
	LOG_LEVEL_DEBUG
)

const (
	CreateLabel = iota
	ReadAllLabel
	ReadLabel
	UpdateLabel
	DeleteLabel
)

type PathPattern struct {
	PathPattern     string
	RedirectPattern string
	Methods         []string
	Permission      int
}

type ConfigT struct {

	// Domain

	Url    string
	Domain string

	// Language

	Language string

	// Logging

	LogLevel int `yaml:"log_level"`

	// Secret keys

	Keys struct {
		CookieStoreKey string `yaml:"cookie_store_key"`
		JWTSigningKey  string `yaml:"jwt_signing_key"`
	}

	// Admin credentials

	Admin struct {
		Username string
		Password string
	}

	// Subscriber credentials

	Subscriber struct {
		Password string
	}

	// Handlers

	Handlers struct {
		PathPatterns    map[string]PathPattern
		APIPathPatterns map[string]PathPattern
		Permissions     map[string]map[string][]int
	}

	// Database

	Orm struct {
		Connection  string
		Options     string
		Reset       bool
		AutoMigrate bool
		Regenerate  bool
	}

	Smtp struct {
		Host     string
		Port     int
		Username string
		Password string
		From     string
		Cc       string
		Bcc      string
		Subject  string
	}
}

var (
	actions []string = []string{"Create", "ReadAll", "Read", "Update", "Delete"}
)

// ReadFile reads the config file placed at the given path.
func ReadFile(path string, config *ConfigT) error {
	cf, err := ioutil.ReadFile(path)
	if err != nil {
		return err
	}
	if err := yaml.Unmarshal(cf, config); err != nil {
		return err
	}
	return nil
}

// Read reads the config data from the given slice.
func Read(data []byte, config *ConfigT) error {
	if err := yaml.Unmarshal(data, config); err != nil {
		return err
	}
	return nil
}

func (pp PathPattern) RedirectPath(model string, id ...uint) string {
	if len(id) > 0 {
		return fmt.Sprintf(pp.RedirectPattern, model, id[0], model)
	}
	return fmt.Sprintf(pp.RedirectPattern, model, model)
}

func (pp PathPattern) Path(model string) string {
	return fmt.Sprintf(pp.PathPattern, model)
}

func (c *ConfigT) ReadAllPath(model interface{}, path, format string) string {
	return path + "?" + c.query(model, ReadAllLabel, format).Encode()
}

func (c *ConfigT) ReadPath(model interface{}, path, format string) string {
	return path + "?" + c.query(model, ReadLabel, format).Encode()
}

func (c *ConfigT) CreatePath(model interface{}, path, format string) string {
	return path + "?" + c.query(model, CreateLabel, format).Encode()
}

func (c *ConfigT) ReadAllPattern() PathPattern {
	return c.Handlers.PathPatterns[actions[ReadAllLabel]]
}

func (c *ConfigT) ReadPattern() PathPattern {
	return c.Handlers.PathPatterns[actions[ReadLabel]]
}

func (c *ConfigT) query(model interface{}, action int, format string) url.Values {
	var tplContent string

	values := make(url.Values)

	values.Add("format", format)

	switch action {
	case CreateLabel:
		tplContent = reflect.ModelNameLowerPlural(model) + "_add_update"
	case ReadAllLabel:
		tplContent = reflect.ModelNameLowerPlural(model)
	case ReadLabel:
		tplContent = reflect.ModelNameLowerPlural(model) + "_show"
	}

	values.Add("tpl_content", tplContent)
	values.Add("tpl_layout", "base") // FIXME: use config value

	return values
}