package svc

import (
	"context"
	"fmt"
	"os"
	"time"

	"haixun-backend/internal/config"
	libmongo "haixun-backend/internal/library/mongo"
	libredis "haixun-backend/internal/library/redis"
	"haixun-backend/internal/library/validate"
	"haixun-backend/internal/middleware"
	aisettings "haixun-backend/internal/model/ai/usecase"
	authrepodomain "haixun-backend/internal/model/auth/domain/repository"
	authdomain "haixun-backend/internal/model/auth/domain/usecase"
	authrepo "haixun-backend/internal/model/auth/repository"
	authuc "haixun-backend/internal/model/auth/usecase"
	jobrepo "haixun-backend/internal/model/job/repository"
	jobusecase "haixun-backend/internal/model/job/usecase"
	memberdomain "haixun-backend/internal/model/member/domain/usecase"
	memberrepo "haixun-backend/internal/model/member/repository"
	memberuc "haixun-backend/internal/model/member/usecase"
	permissiondomain "haixun-backend/internal/model/permission/domain/usecase"
	permissionrepo "haixun-backend/internal/model/permission/repository"
	permissionuc "haixun-backend/internal/model/permission/usecase"
	settingrepo "haixun-backend/internal/model/setting/repository"
	settingusecase "haixun-backend/internal/model/setting/usecase"
	jobworker "haixun-backend/internal/worker/job"

	goredis "github.com/redis/go-redis/v9"
	"github.com/zeromicro/go-zero/rest"
)

type ServiceContext struct {
	Config    config.Config
	Validator *validate.Validate
	Mongo     *libmongo.Client
	Redis     *goredis.Client

	Setting    settingusecase.UseCase
	AI         aisettings.UseCase
	Job        jobusecase.UseCase
	AuthToken  authdomain.TokenUseCase
	Member     memberdomain.UseCase
	Permission permissiondomain.UseCase

	// Middlewares mounted per route group via generate/api `middleware:` directive.
	AuthJWT    rest.Middleware
	MemberAuth rest.Middleware

	stopWorker    context.CancelFunc
	stopScheduler context.CancelFunc
	stopReaper    context.CancelFunc
}

func NewServiceContext(c config.Config) *ServiceContext {
	ctx := context.Background()
	mongoClient, err := libmongo.NewClient(ctx, c.Mongo)
	if err != nil {
		panic(err)
	}
	redisClient := libredis.NewClient(c.Redis)

	settingRepository := settingrepo.NewMongoRepository(mongoClient.Database())
	if err := settingRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	settingUseCase := settingusecase.NewUseCase(settingRepository)

	var tokenRevokeStore authrepodomain.TokenRevokeStore
	if redisClient != nil {
		tokenRevokeStore = authrepo.NewRedisTokenRevokeStore(redisClient)
	}
	authTokenUseCase := authuc.NewTokenUseCase(c.Auth, tokenRevokeStore)

	memberRepository := memberrepo.NewMongoRepository(mongoClient.Database())
	if err := memberRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	memberUseCase := memberuc.NewUseCase(memberRepository, authTokenUseCase)

	permissionRepository := permissionrepo.NewMongoPermissionRepository(mongoClient.Database())
	rolePermissionRepository := permissionrepo.NewMongoRolePermissionRepository(mongoClient.Database())
	if err := permissionRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	if err := rolePermissionRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	permissionUseCase := permissionuc.NewUseCase(permissionRepository, rolePermissionRepository)
	if err := permissionUseCase.EnsureDefaultPermissions(ctx); err != nil {
		panic(err)
	}

	jobTemplateRepository := jobrepo.NewMongoTemplateRepository(mongoClient.Database())
	jobRunRepository := jobrepo.NewMongoRunRepository(mongoClient.Database())
	jobScheduleRepository := jobrepo.NewMongoScheduleRepository(mongoClient.Database())
	jobEventRepository := jobrepo.NewMongoEventRepository(mongoClient.Database())
	jobQueueRepository := jobrepo.NewRedisQueueRepository(redisClient)
	if err := jobTemplateRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	if err := jobRunRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	if err := jobScheduleRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}
	if err := jobEventRepository.EnsureIndexes(ctx); err != nil {
		panic(err)
	}

	jobUseCase := jobusecase.NewUseCase(jobTemplateRepository, jobRunRepository, jobScheduleRepository, jobEventRepository, jobQueueRepository)
	if err := jobUseCase.EnsureDemoTemplate(ctx); err != nil {
		panic(err)
	}

	sc := &ServiceContext{
		Config:     c,
		Validator:  validate.New(),
		Mongo:      mongoClient,
		Redis:      redisClient,
		Setting:    settingUseCase,
		AI:         aisettings.NewUseCase(),
		Job:        jobUseCase,
		AuthToken:  authTokenUseCase,
		Member:     memberUseCase,
		Permission: permissionUseCase,
	}

	hostname, _ := os.Hostname()
	if c.JobWorker.Enabled && redisClient != nil {
		workerType := c.JobWorker.WorkerType
		if workerType == "" {
			workerType = "go"
		}
		workerID := c.JobWorker.WorkerID
		if workerID == "" {
			workerID = fmt.Sprintf("%s-%s-worker", hostname, workerType)
		}
		workerCtx, cancel := context.WithCancel(context.Background())
		sc.stopWorker = cancel
		runner := jobworker.NewRunner(workerID, workerType, jobUseCase)
		go runner.Start(workerCtx)
	}

	if c.JobScheduler.Enabled && redisClient != nil {
		schedulerHolder := fmt.Sprintf("%s-scheduler", hostname)
		interval := time.Duration(c.JobScheduler.IntervalSeconds) * time.Second
		if interval <= 0 {
			interval = time.Minute
		}
		schedulerCtx, cancel := context.WithCancel(context.Background())
		sc.stopScheduler = cancel
		scheduler := jobworker.NewScheduler(schedulerHolder, jobUseCase)
		go scheduler.Start(schedulerCtx, interval)
	}

	if c.JobReaper.Enabled && redisClient != nil {
		interval := time.Duration(c.JobReaper.IntervalSeconds) * time.Second
		if interval <= 0 {
			interval = 30 * time.Second
		}
		reaperCtx, cancel := context.WithCancel(context.Background())
		sc.stopReaper = cancel
		reaper := jobworker.NewReaper(jobUseCase)
		go reaper.Start(reaperCtx, interval)
	}

	sc.AuthJWT = middleware.NewAuthJWTMiddleware(sc.AuthToken, sc.Config.Auth).Handle
	sc.MemberAuth = middleware.NewMemberAuthMiddleware(sc.AuthToken, sc.Config.Auth).Handle

	return sc
}

func (sc *ServiceContext) Close(ctx context.Context) {
	if sc == nil {
		return
	}
	if sc.stopWorker != nil {
		sc.stopWorker()
	}
	if sc.stopScheduler != nil {
		sc.stopScheduler()
	}
	if sc.stopReaper != nil {
		sc.stopReaper()
	}
	_ = sc.Mongo.Close(ctx)
	if sc.Redis != nil {
		_ = sc.Redis.Close()
	}
}