package mgr

import (
	"fmt"
	"log"
	"os"
	"path"
	"sync"
	"time"

	"baal.ar76.eu/x/pub/multisql/cfg"
	"baal.ar76.eu/x/pub/multisql/pass"
	"baal.ar76.eu/x/pub/multisql/psql"
)

type Manager struct {
	config  cfg.Config
	runDir  string
	verbose bool
	askPass bool
}

func Create(verbose bool, askPass bool, outdir string, config cfg.Config) (Manager, error) {
	runDir := createRunDir(outdir)

	manager := Manager{
		config:  config,
		runDir:  runDir,
		verbose: verbose,
		askPass: askPass,
	}

	return manager, nil
}

func createRunDir(out string) string {
	t := time.Now()
	dataPart := t.Format("2006-01-02T15_04_05")
	newDir := fmt.Sprintf("%s-%d", dataPart, os.Getpid())
	dir := path.Join(out, newDir)
	return dir
}

func (self Manager) GetScripts() ([]string, error) {
	entries, err := os.ReadDir(self.config.SqlDir)
	if err != nil {
		return nil, fmt.Errorf("błąd wczytywania skryptów: %w", err)
	}
	scripts := make([]string, 0, len(entries))
	for _, e := range entries {
		if e.IsDir() {
			continue
		}
		scrpt := path.Join(self.config.SqlDir, e.Name())
		_, err := os.Stat(scrpt)
		if err != nil {
			log.Printf("Skrypt zostanie pominięty z powodu błedu: %v\n", err)
			continue
		}
		scripts = append(scripts, scrpt)
	}
	return scripts, err
}

func (self Manager) Run() error {
	err := os.Mkdir(self.runDir, 0o755)
	if err != nil {
		return fmt.Errorf("błąd tworzenia katalogu z wynikami: %w", err)
	}
	scripts, err := self.GetScripts()
	if err != nil {
		return err
	}

	var passdb *pass.PassDb

	if self.config.PassFile != "" {
		password := pass.GetMasterPass(self.askPass)
		passdb, err = pass.Load(self.config.PassFile, password)
		if err != nil {
			return err
		}
	}

	var group sync.WaitGroup

	for _, con := range self.config.Connections {
		dbDir, err := self.createDirPerCon(con)
		if err != nil {
			log.Printf("Problem z utworzeniem katalogu wynikow dla połaczenie: %v", dbDir)
			log.Printf("Pomijam połaczenie")
			continue
		}

		group.Add(1)
		stream := make(chan psql.Result)
		go self.Logger(&group, stream, con)

		sql := psql.Create(
			passdb,
			dbDir,
			scripts,
			con,
			self.config.PsqlExec,
			self.verbose,
		)
		go sql.Exec(stream)
	}

	group.Wait()
	return nil
}

func (self Manager) createDirPerCon(con cfg.Connection) (string, error) {
	dbDir := fmt.Sprintf("%s_%d_%s_%s", con.Host, con.Port, con.DbName, con.User)
	dir := path.Join(self.runDir, dbDir)
	err := os.Mkdir(dir, 0o755)
	return dir, err
}

func (self Manager) Logger(group *sync.WaitGroup, stream <-chan psql.Result, con cfg.Connection) {
	for event := range stream {
		if event.Err != nil {
			scr := path.Base(event.Script)
			log.Printf("%s:%d:%s:%s Skrypt: %s Błąd: %v\n", con.Host, con.Port, con.DbName, con.User, scr, event.Err)
		} else if self.verbose {
			scr := path.Base(event.Script)
			log.Printf("%s:%d:%s:%s Skrypt %s zakończony poprawnie\n", con.Host, con.Port, con.DbName, con.User, scr)
		}
	}
	group.Done()
}