package data

import (
	"context"
	"errors"
	"fmt"

	"kra/internal/biz"
	"kra/internal/conf"
	datasystem "kra/internal/data/system"
	"kra/internal/integration/storage"

	"github.com/google/uuid"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

func (r *initializationRepo) PersistConfig(context.Context) error { return r.data.persistConfig() }
func (r *initializationRepo) PersistAdminConfig(ctx context.Context, raw []byte) error {
	currentData, currentAdmin := r.data.runtime.Values()
	next := proto.Clone(currentAdmin).(*conf.AdminBackend)
	if err := (protojson.UnmarshalOptions{DiscardUnknown: true}).Unmarshal(raw, next); err != nil {
		return err
	}
	if next.Storage == nil {
		next.Storage = currentAdmin.Storage
	}
	if next.Email == nil {
		next.Email = currentAdmin.Email
	}
	next.ConfigPath = currentAdmin.ConfigPath
	candidateStorage, err := storage.New(next)
	if err != nil {
		return err
	}
	if err := r.data.persistStorageIntegrationConfig(ctx, next.Storage); err != nil {
		return err
	}
	if err := r.data.persistEmailIntegrationConfig(ctx, next.Email); err != nil {
		return err
	}
	if err := r.data.persistConfigValues(currentData, next); err != nil {
		return err
	}
	// Writing through the management API updates the same in-memory values
	// immediately; the file watcher remains the fallback for external edits.
	r.data.runtime.Replace(currentData, next)
	if r.data.storage != nil {
		r.data.storage.Replace(candidateStorage)
	}
	return nil
}
func (r *initializationRepo) PersistRuntimeConfig(ctx context.Context, dataRaw, adminRaw []byte) error {
	currentData, currentAdmin := r.data.runtime.Values()
	nextData := proto.Clone(currentData).(*conf.Data)
	nextAdmin := proto.Clone(currentAdmin).(*conf.AdminBackend)
	options := protojson.UnmarshalOptions{DiscardUnknown: true}
	if err := options.Unmarshal(dataRaw, nextData); err != nil {
		return err
	}
	if err := options.Unmarshal(adminRaw, nextAdmin); err != nil {
		return err
	}
	if nextAdmin.Storage == nil {
		nextAdmin.Storage = currentAdmin.Storage
	}
	if nextAdmin.Email == nil {
		nextAdmin.Email = currentAdmin.Email
	}
	nextAdmin.ConfigPath = currentAdmin.ConfigPath
	candidateStorage, err := storage.New(nextAdmin)
	if err != nil {
		return err
	}
	if err := r.data.persistStorageIntegrationConfig(ctx, nextAdmin.Storage); err != nil {
		return err
	}
	if err := r.data.persistEmailIntegrationConfig(ctx, nextAdmin.Email); err != nil {
		return err
	}
	if err := r.data.persistConfigValues(nextData, nextAdmin); err != nil {
		return err
	}
	r.data.runtime.Replace(nextData, nextAdmin)
	if r.data.storage != nil {
		r.data.storage.Replace(candidateStorage)
	}
	return nil
}
func (r *initializationRepo) ReloadConfig(ctx context.Context) error {
	return r.data.reloadConfig(ctx)
}

func (r *initializationRepo) IsInitialized(ctx context.Context) (bool, error) {
	return r.data.databaseReady.Load(), nil
}

func (r *initializationRepo) Initialize(ctx context.Context, input *biz.DatabaseConfig) error {
	config := &conf.Data_Database{}
	if current := r.data.runtime.Data(); current != nil && current.Database != nil {
		config = proto.Clone(current.Database).(*conf.Data_Database)
	}
	config.Driver = input.Driver
	config.Host = input.Host
	config.Port = input.Port
	config.User = input.User
	config.Password = input.Password
	config.Name = input.Name
	config.Path = input.Path
	config.Config = input.Config
	config.Source = ""
	source, err := databaseDSN(config, "")
	if err != nil {
		return err
	}
	config.Source = source
	r.data.initMu.Lock()
	defer r.data.initMu.Unlock()
	initialized, err := r.IsInitialized(ctx)
	if err != nil {
		return err
	}
	if initialized {
		return errors.New("数据库已初始化，无需重复初始化")
	}
	candidate, err := openDatabase(config, true, input.Template, r.data.logger())
	if err != nil {
		return err
	}
	activated := false
	defer func() {
		if !activated {
			if sqlDB, closeErr := candidate.DB(); closeErr == nil {
				_ = sqlDB.Close()
			}
		}
	}()
	db := candidate.WithContext(ctx)
	if err := migrateAll(db); err != nil {
		return err
	}
	if err := datasystem.SeedSystem(ctx, db, input); err != nil {
		return err
	}
	currentAdmin := r.data.runtime.Admin()
	var legacyStorage *conf.AdminBackend_Storage
	if currentAdmin != nil {
		legacyStorage = currentAdmin.Storage
	}
	storageConfig, err := resolveStorageIntegrationConfig(candidate.WithContext(ctx), legacyStorage)
	if err != nil {
		return fmt.Errorf("initialize storage integration configuration: %w", err)
	}
	var legacyEmail *conf.AdminBackend_Email
	if currentAdmin != nil {
		legacyEmail = currentAdmin.Email
	}
	emailConfig, err := resolveEmailIntegrationConfig(candidate.WithContext(ctx), legacyEmail)
	if err != nil {
		return fmt.Errorf("initialize email integration configuration: %w", err)
	}
	signingKey := uuid.NewString()
	if err := r.data.persistDatabaseConfig(config, signingKey); err != nil {
		return fmt.Errorf("persist database configuration: %w", err)
	}
	r.data.activateDatabase(candidate, config)
	currentData, currentAdmin := r.data.runtime.Values()
	if currentAdmin == nil {
		currentAdmin = &conf.AdminBackend{}
	}
	if currentAdmin.Jwt == nil {
		currentAdmin.Jwt = &conf.AdminBackend_JWT{}
	}
	currentAdmin.Jwt.SigningKey = signingKey
	currentAdmin.Storage = storageConfig
	currentAdmin.Email = emailConfig
	r.data.runtime.Replace(currentData, currentAdmin)
	activated = true
	return nil
}