package bootstrap

import (
	"context"
	"fmt"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/jackc/pgx/v5/pgxpool"
	goredis "github.com/redis/go-redis/v9"
	"go.uber.org/zap"

	"github.com/geo-platform/tenant-api/internal/shared/auditlog"
	"github.com/geo-platform/tenant-api/internal/shared/auth"
	"github.com/geo-platform/tenant-api/internal/shared/cache"
	"github.com/geo-platform/tenant-api/internal/shared/config"
	"github.com/geo-platform/tenant-api/internal/shared/llm"
	"github.com/geo-platform/tenant-api/internal/shared/middleware"
	"github.com/geo-platform/tenant-api/internal/shared/objectstorage"
	"github.com/geo-platform/tenant-api/internal/shared/observability"
	"github.com/geo-platform/tenant-api/internal/shared/repository/postgres"
	"github.com/geo-platform/tenant-api/internal/shared/repository/redis"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/shared/retrieval"
	"github.com/geo-platform/tenant-api/internal/shared/stream"
)

type App struct {
	Config            *config.Config
	Logger            *zap.Logger
	DB                *pgxpool.Pool
	Redis             *goredis.Client
	Engine            *gin.Engine
	JWT               *auth.Manager
	Sessions          *auth.SessionStore
	LLM               llm.Client
	RetrievalProvider retrieval.Provider
	VectorStore       retrieval.VectorStore
	ObjectStorage     objectstorage.Client
	AuditLogs         *auditlog.AsyncWriter
	GenerationStreams *stream.GenerationHub
	Cache             cache.Cache
}

func New(configPath string) (*App, error) {
	cfg, err := config.Load(configPath)
	if err != nil {
		return nil, fmt.Errorf("load config: %w", err)
	}

	logger, err := observability.NewLogger(cfg.Log.Level, cfg.Log.Format)
	if err != nil {
		return nil, fmt.Errorf("init logger: %w", err)
	}

	ctx := context.Background()

	pool, err := postgres.NewPool(ctx, cfg.Database)
	if err != nil {
		return nil, fmt.Errorf("init postgres: %w", err)
	}

	rdb, err := redis.NewClient(ctx, cfg.Redis)
	if err != nil {
		pool.Close()
		return nil, fmt.Errorf("init redis: %w", err)
	}

	jwtMgr := auth.NewManager(cfg.JWT.Secret, cfg.JWT.AccessTTL, cfg.JWT.RefreshTTL)
	sessions := auth.NewSessionStore(rdb)
	llmClient := llm.New(cfg.LLM)
	retrievalProvider := retrieval.NewProvider(cfg.Retrieval, logger)
	vectorStore := retrieval.NewQdrantStore(cfg.Qdrant, logger)
	objectStorageClient := objectstorage.New(cfg.ObjectStorage, logger)
	auditLogs := auditlog.NewAsyncWriter(pool, logger)
	generationStreams := stream.NewGenerationHub()
	appCache := cache.New(cfg.Cache.Driver, rdb)

	if cfg.Server.Mode == "release" {
		gin.SetMode(gin.ReleaseMode)
	}
	engine := gin.New()

	engine.Use(
		middleware.Recovery(logger),
		middleware.RequestID(),
		middleware.CORS(),
	)

	engine.GET("/api/health/live", func(c *gin.Context) {
		response.Success(c, gin.H{"status": "alive"})
	})
	engine.GET("/api/health/ready", func(c *gin.Context) {
		if err := pool.Ping(c.Request.Context()); err != nil {
			response.Error(c, response.ErrServiceUnavailable(50301, "postgres_unavailable", "database is not reachable"))
			return
		}
		if err := rdb.Ping(c.Request.Context()).Err(); err != nil {
			response.Error(c, response.ErrServiceUnavailable(50302, "redis_unavailable", "redis is not reachable"))
			return
		}
		response.Success(c, gin.H{"status": "ready"})
	})

	return &App{
		Config:            cfg,
		Logger:            logger,
		DB:                pool,
		Redis:             rdb,
		Engine:            engine,
		JWT:               jwtMgr,
		Sessions:          sessions,
		LLM:               llmClient,
		RetrievalProvider: retrievalProvider,
		VectorStore:       vectorStore,
		ObjectStorage:     objectStorageClient,
		AuditLogs:         auditLogs,
		GenerationStreams: generationStreams,
		Cache:             appCache,
	}, nil
}

func (a *App) Close() {
	if a.AuditLogs != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
		if err := a.AuditLogs.Close(ctx); err != nil {
			a.Logger.Warn("shutdown with pending audit logs", zap.Error(err))
		}
		cancel()
	}
	a.DB.Close()
	_ = a.Redis.Close()
	_ = a.Logger.Sync()
}