package config

import (
	"deploy/pkg/set"
	"deploy/pkg/tools"
	"fmt"
	"strings"

	errors "github.com/pkg/errors"
	"github.com/robfig/cron/v3"

	confLoader "github.com/otakukaze/config-loader"
)

type Config struct {
	Server   Server    `yaml:"server"`
	Listens  []Listen  `yaml:"listens"`
	CronJobs []CronJob `yaml:"cron_jobs"`
}

type Server struct {
	Port int `yaml:"port" env:"SERVER_PORT" default:"10230"`
}

type CronJob struct {
	CronTime string `yaml:"cron_time"`
	Script   string `yaml:"script"`
}

type Listen struct {
	HTTP *HTTPListen `yaml:"http"`
}

type HTTPListen struct {
	Method  string            `yaml:"method"`
	Path    string            `yaml:"path"`
	Headers map[string]string `yaml:"headers"`
	Script  string            `yaml:"script"`
}

func Load(p ...string) (*Config, error) {

	cfg := &Config{}

	opts := &confLoader.LoadOptions{
		FromEnv: true,
	}

	// check path exists
	if len(p) > 0 && p[0] != "" {
		if !tools.CheckExists(p[0], false) {
			return nil, errors.New("config not exist")
		}

		opts.ConfigFile = &confLoader.ConfigFile{
			Type: confLoader.ConfigFileTypeYAML,
			Path: tools.ParsePath(p[0]),
		}
	}

	if err := confLoader.Load(&cfg, opts); err != nil {
		return nil, err
	}

	// check all listen path and script
	pathSet := set.NewSet()

	for _, v := range cfg.Listens {
		if v.HTTP == nil {
			continue
		}

		key := fmt.Sprintf("%s-%s", v.HTTP.Method, v.HTTP.Path)

		if pathSet.Has(key) {
			return nil, errors.WithStack(fmt.Errorf("path is duplicate: %s\n", v.HTTP.Path))
		}

		v.HTTP.Method = strings.ToUpper(v.HTTP.Method)

		// check method support
		switch v.HTTP.Method {
		case "GET":
		case "POST":
			break
		default:
			return nil, errors.WithStack(fmt.Errorf("http method (%s) not support", v.HTTP.Method))
		}

		pathSet.Add(key)

		// check script exists
		if !tools.CheckExists(v.HTTP.Script, false) {
			return nil, errors.WithStack(fmt.Errorf("path (%s) script not exists: %s\n", v.HTTP.Path, v.HTTP.Script))
		}
	}

	// check cronJob
	cronParser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow)
	for _, v := range cfg.CronJobs {
		_, err := cronParser.Parse(v.CronTime)
		if err != nil {
			return nil, err
		}

		// check script exists
		if !tools.CheckExists(v.Script, false) {
			return nil, errors.WithStack(fmt.Errorf("cron (%s) script not exists: %s\n", v.CronTime, v.Script))
		}
	}

	return cfg, nil
}