package repo

/*
	/state.json
	/0001/state.json
	/0001/meta.json
	/0001/bombing.json
	/0001/battle/{UUID}.json
	/0001/report/{UUID}.json
*/

import (
	"fmt"

	"github.com/google/uuid"
	"github.com/iliadenisov/galaxy/internal/model/game"
	"github.com/iliadenisov/galaxy/internal/model/report"
)

const (
	statePath = "state.json"
	metaPath  = "meta.json"
)

func (r *repo) SaveReport(t uint, rep *report.Report) error {
	return saveReport(r.s, t, rep)
}

func saveReport(s Storage, t uint, v *report.Report) error {
	path := repDir(t, v.RaceID)
	if err := s.Write(path, v); err != nil {
		return NewStorageError(err)
	}
	return nil
}

func (r *repo) LoadReport(t uint, id uuid.UUID) (*report.Report, error) {
	return loadReport(r.s, t, id)
}

func loadReport(s Storage, t uint, id uuid.UUID) (*report.Report, error) {
	path := repDir(t, id)
	result := new(report.Report)
	exist, err := s.Exists(path)
	if err != nil {
		return nil, NewStorageError(err)
	}
	if !exist {
		return nil, NewReportNotFoundError()
	}
	if err := s.ReadSafe(path, result); err != nil {
		return nil, NewStorageError(err)
	}
	return result, nil
}

func (r *repo) SaveNewTurn(t uint, g *game.Game) error {
	return saveNewTurn(r.s, t, g)
}

func saveNewTurn(s Storage, t uint, g *game.Game) error {
	path := fmt.Sprintf("%s/state.json", turnDir(t))
	exist, err := s.Exists(path)
	if err != nil {
		return NewStorageError(err)
	}
	if exist {
		return NewStateError(fmt.Sprintf("turn %d already saved at %s", t, path))
	}
	if err := s.Write(path, g); err != nil {
		return NewStorageError(err)
	}
	return saveLastState(s, g)
}

func (r *repo) SaveLastState(g *game.Game) error {
	return saveLastState(r.s, g)
}

func saveLastState(s Storage, g *game.Game) error {
	if err := s.Write(statePath, g); err != nil {
		return NewStorageError(err)
	}
	return nil
}

func (r *repo) LoadState() (*game.Game, error) {
	return loadState(r.s, true)
}

func (r *repo) LoadStateSafe() (*game.Game, error) {
	return loadState(r.s, false)
}

func loadState(s Storage, locked bool) (*game.Game, error) {
	var result *game.Game = new(game.Game)
	path := statePath
	exist, err := s.Exists(path)
	if err != nil {
		return nil, NewStorageError(err)
	}
	if !exist {
		return nil, NewGameNotInitializedError()
	}
	if locked {
		if err := s.Read(path, result); err != nil {
			return nil, NewStorageError(err)
		}
	} else {
		if err := s.ReadSafe(path, result); err != nil {
			return nil, NewStorageError(err)
		}
	}
	return result, nil
}

func loadMeta(s Storage) (*game.GameMeta, error) {
	var result *game.GameMeta = new(game.GameMeta)
	path := metaPath
	exist, err := s.Exists(path)
	if err != nil {
		return nil, NewStorageError(err)
	}
	if !exist {
		return result, nil
	}
	if err := s.ReadSafe(path, result); err != nil {
		return nil, NewStorageError(err)
	}
	return result, nil
}

func saveMeta(s Storage, t uint, gm *game.GameMeta) error {
	// save turn's meta
	path := fmt.Sprintf("%s/%s", turnDir(t), metaPath)
	if err := s.Write(path, gm); err != nil {
		return NewStorageError(err)
	}
	// also save as latest meta
	path = metaPath
	if err := s.Write(path, gm); err != nil {
		return NewStorageError(err)
	}
	return nil
}

func (r *repo) SaveBattle(t uint, b *report.BattleReport, m *game.BattleMeta) error {
	meta, err := loadMeta(r.s)
	if err != nil {
		return err
	}
	err = saveBattle(r.s, t, b)
	if err != nil {
		return err
	}
	meta.Battles = append(meta.Battles, *m)
	return saveMeta(r.s, t, meta)
}

func saveBattle(s Storage, t uint, b *report.BattleReport) error {
	path := fmt.Sprintf("%s/battle/%s.json", turnDir(t), b.ID.String())
	exist, err := s.Exists(path)
	if err != nil {
		return NewStorageError(err)
	}
	if exist {
		return NewStateError(fmt.Sprintf("battle %v for turn %d already has been saved", b.ID, t))
	}
	if err := s.Write(path, b); err != nil {
		return NewStorageError(err)
	}
	return nil
}

func (r *repo) SaveBombings(t uint, b []*game.Bombing) error {
	meta, err := loadMeta(r.s)
	if err != nil {
		return err
	}
	for i := range b {
		meta.Bombings = append(meta.Bombings, *b[i])
	}
	return saveMeta(r.s, t, meta)
}

func repDir(t uint, id uuid.UUID) string {
	return fmt.Sprintf("%s/report/%s.json", turnDir(t), id.String())
}

func turnDir(t uint) string {
	return fmt.Sprintf("%04d", t)
}