// Package main defines a command line interface for the sqlboiler package
package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"

	"github.com/kat-co/vala"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	cmdState  *State
	cmdConfig *Config
)

func main() {
	var err error

	viper.SetConfigName("sqlboiler")

	configHome := os.Getenv("XDG_CONFIG_HOME")
	homePath := os.Getenv("HOME")
	wd, err := os.Getwd()
	if err != nil {
		wd = "./"
	}

	configPaths := []string{wd}
	if len(configHome) > 0 {
		configPaths = append(configPaths, filepath.Join(configHome, "sqlboiler"))
	} else {
		configPaths = append(configPaths, filepath.Join(homePath, ".config/sqlboiler"))
	}

	for _, p := range configPaths {
		viper.AddConfigPath(p)
	}

	// Find and read config, ignore errors because we'll fall back to defaults
	// and other validation mechanisms
	_ = viper.ReadInConfig()

	// Set up the cobra root command
	var rootCmd = &cobra.Command{
		Use:   "sqlboiler [flags] <driver>",
		Short: "SQL Boiler generates an ORM tailored to your database schema.",
		Long: "SQL Boiler generates a Go ORM from template files, tailored to your database schema.\n" +
			`Complete documentation is available at http://github.com/vattle/sqlboiler`,
		Example:       `sqlboiler postgres`,
		PreRunE:       preRun,
		RunE:          run,
		PostRunE:      postRun,
		SilenceErrors: true,
		SilenceUsage:  true,
	}

	// Set up the cobra root command flags
	rootCmd.PersistentFlags().StringP("output", "o", "models", "The name of the folder to output to")
	rootCmd.PersistentFlags().StringP("pkgname", "p", "models", "The name you wish to assign to your generated package")

	viper.SetDefault("postgres.sslmode", "require")
	viper.SetDefault("postgres.port", "5432")
	viper.BindPFlags(rootCmd.PersistentFlags())
	viper.AutomaticEnv()

	if err := rootCmd.Execute(); err != nil {
		if e, ok := err.(commandFailure); ok {
			fmt.Printf("%s\n", string(e))
			return
		}

		fmt.Printf("%+v\n", err)
		os.Exit(1)
	}
}

type commandFailure string

func (c commandFailure) Error() string {
	return string(c)
}

func preRun(cmd *cobra.Command, args []string) error {
	var err error

	if len(args) == 0 {
		return commandFailure("Must provide a driver name.")
	}

	driverName := args[0]

	cmdConfig = &Config{
		DriverName: driverName,
		OutFolder:  viper.GetString("output"),
		PkgName:    viper.GetString("pkgname"),
	}

	if viper.IsSet("postgres.dbname") {
		cmdConfig.Postgres = PostgresConfig{
			User:    viper.GetString("postgres.user"),
			Pass:    viper.GetString("postgres.pass"),
			Host:    viper.GetString("postgres.host"),
			Port:    viper.GetInt("postgres.port"),
			DBName:  viper.GetString("postgres.dbname"),
			SSLMode: viper.GetString("postgres.sslmode"),
		}

		// Set the default SSLMode value
		if cmdConfig.Postgres.SSLMode == "" {
			viper.Set("postgres.sslmode", "require")
			cmdConfig.Postgres.SSLMode = viper.GetString("postgres.sslmode")
		}

		err = vala.BeginValidation().Validate(
			vala.StringNotEmpty(cmdConfig.Postgres.User, "postgres.user"),
			vala.StringNotEmpty(cmdConfig.Postgres.Host, "postgres.host"),
			vala.Not(vala.Equals(cmdConfig.Postgres.Port, 0, "postgres.port")),
			vala.StringNotEmpty(cmdConfig.Postgres.DBName, "postgres.dbname"),
			vala.StringNotEmpty(cmdConfig.Postgres.SSLMode, "postgres.sslmode"),
		).Check()

		if err != nil {
			return commandFailure(err.Error())
		}
	} else if driverName == "postgres" {
		return errors.New("Postgres driver requires a postgres section in your config file.")
	}

	cmdState, err = New(cmdConfig)
	return err
}

func run(cmd *cobra.Command, args []string) error {
	return cmdState.Run(true)
}

func postRun(cmd *cobra.Command, args []string) error {
	return cmdState.Cleanup()
}