package esi

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"time"

	"go-eve-pi/options"
	"go-eve-pi/types"

	logger "git.site.quack-lab.dev/dave/cylogger"
)

type CacheDB interface {
	GetCacheEntry(hash string) (*types.CacheEntry, error)
	SaveCacheEntry(entry *types.CacheEntry) error
}

// CachedESI implements ESIInterface with caching
type CachedESI struct {
	direct        ESIInterface
	db            CacheDB
	cacheValidity time.Duration
}

// NewCachedESI creates a new CachedESI instance
func NewCachedESI(direct ESIInterface, db CacheDB) *CachedESI {
	// Parse cache validity ONCE at initialization
	cacheValidity, err := time.ParseDuration(options.GlobalOptions.CacheValidity)
	if err != nil {
		logger.Error("Invalid cache validity duration %s: %v", options.GlobalOptions.CacheValidity, err)
		os.Exit(1)
	}

	logger.Info("Initializing CachedESI with cache validity: %v", cacheValidity)
	return &CachedESI{
		direct:        direct,
		db:            db,
		cacheValidity: cacheValidity,
	}
}

// GetPlanetPI retrieves detailed information about a specific planet with caching
func (c *CachedESI) GetPlanetPI(ctx context.Context, characterID int, planetID int64, accessToken string) (*PlanetPI, error) {
	funclog := logger.Default.WithPrefix("CachedESI.GetPlanetPI").WithPrefix(fmt.Sprintf("characterID=%d", characterID)).WithPrefix(fmt.Sprintf("planetID=%d", planetID))
	funclog.Info("Starting")

	hash := fmt.Sprintf("GetPlanetPI-%d-%d", characterID, planetID)
	cached, err := c.db.GetCacheEntry(hash)
	if err != nil {
		funclog.Warning("Failed to get cache entry: %v", err)
	}
	if cached != nil {
		funclog.Info("Cache hit for GetPlanetPI-%d-%d", characterID, planetID)
		var planetPI PlanetPI
		if err := json.Unmarshal([]byte(cached.Data), &planetPI); err != nil {
			funclog.Error("Failed to unmarshal cached data: %v", err)
			return nil, err
		}
		return &planetPI, nil
	}
	funclog.Info("Cache miss for GetPlanetPI-%d-%d", characterID, planetID)
	
	apiresp, err := c.direct.GetPlanetPI(ctx, characterID, planetID, accessToken)
	if err != nil {
		funclog.Error("Failed to get planet PI: %v", err)
		return nil, err
	}
	apirespjson, err := json.Marshal(apiresp)
	if err != nil {
		funclog.Error("Failed to marshal planet PI: %v", err)
		return nil, err
	}
	cacheEntry := &types.CacheEntry{
		Hash: hash,
		Data: string(apirespjson),
		CachedAt: time.Now(),
	}
	err = c.db.SaveCacheEntry(cacheEntry)
	if err != nil {
		funclog.Warning("Failed to save cache entry: %v", err)
	}
	return apiresp, nil
}

// GetPlanetName retrieves planet name with caching
func (c *CachedESI) GetPlanetName(ctx context.Context, planetID int64) (*PlanetName, error) {
	funclog := logger.Default.WithPrefix("CachedESI.GetPlanetName").WithPrefix(fmt.Sprintf("planetID=%d", planetID))
	funclog.Info("Starting")

	hash := fmt.Sprintf("GetPlanetName-%d", planetID)
	cached, err := c.db.GetCacheEntry(hash)
	if err != nil {
		funclog.Warning("Failed to get cache entry: %v", err)
	}
	if cached != nil {
		funclog.Info("Cache hit for GetPlanetName-%d", planetID)
		var planetPI PlanetName
		if err := json.Unmarshal([]byte(cached.Data), &planetPI); err != nil {
			funclog.Error("Failed to unmarshal cached data: %v", err)
			return nil, err
		}
		return &planetPI, nil
	}
	funclog.Info("Cache miss for GetPlanetName-%d", planetID)
	apiresp, err := c.direct.GetPlanetName(ctx, planetID)
	if err != nil {
		funclog.Error("Failed to get planet name: %v", err)
		return nil, err
	}
	apirespjson, err := json.Marshal(apiresp)
	if err != nil {
		funclog.Error("Failed to marshal planet name: %v", err)
		return nil, err
	}
	cacheEntry := &types.CacheEntry{
		Hash: hash,
		Data: string(apirespjson),
		CachedAt: time.Now(),
	}
	err = c.db.SaveCacheEntry(cacheEntry)
	if err != nil {
		funclog.Warning("Failed to save cache entry: %v", err)
	}
	return apiresp, nil
}

func (c *CachedESI) GetCharacterPlanets(ctx context.Context, characterID int, accessToken string) ([]Planet, error) {
	funclog := logger.Default.WithPrefix("CachedESI.GetCharacterPlanets").WithPrefix(fmt.Sprintf("characterID=%d", characterID))
	funclog.Info("Starting")

	hash := fmt.Sprintf("GetCharacterPlanets-%d", characterID)
	cached, err := c.db.GetCacheEntry(hash)
	if err != nil {
		funclog.Warning("Failed to get cache entry: %v", err)
	}
	if cached != nil {
		funclog.Info("Cache hit for GetCharacterPlanets-%d", characterID)
		var planets []Planet
		if err := json.Unmarshal([]byte(cached.Data), &planets); err != nil {
			funclog.Error("Failed to unmarshal cached data: %v", err)
			return nil, err
		}
		return planets, nil
	}
	funclog.Info("Cache miss for GetCharacterPlanets-%d", characterID)
	apiresp, err := c.direct.GetCharacterPlanets(ctx, characterID, accessToken)
	if err != nil {
		funclog.Error("Failed to get character planets: %v", err)
		return nil, err
	}
	apirespjson, err := json.Marshal(apiresp)
	if err != nil {
		funclog.Error("Failed to marshal character planets: %v", err)
		return nil, err
	}
	cacheEntry := &types.CacheEntry{
		Hash: hash,
		Data: string(apirespjson),
		CachedAt: time.Now(),
	}
	err = c.db.SaveCacheEntry(cacheEntry)
	if err != nil {
		funclog.Warning("Failed to save cache entry: %v", err)
	}
	return apiresp, nil
}

var _ ESIInterface = &CachedESI{}