// 平台 API 命令行工具。
package main

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"strings"

	"git.apinb.com/bsm-sdk/core/database"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/config"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/initdb"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/logic/platform"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/routers"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/seed"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

const serviceKey = "heqi"

func main() {
	if len(os.Args) < 2 {
		printUsage()
		os.Exit(1)
	}
	switch os.Args[1] {
	case "version":
		fmt.Println("platform-cli 0.1.0")
	case "resource-contract":
		if err := writeResourceContract(os.Stdout); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
	case "mock-data":
		if err := writeMockData(); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Println("mock data written successfully")
	case "migrate":
		if err := migrateDatabase(); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Println("database migrated successfully")
	default:
		fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
		printUsage()
		os.Exit(1)
	}
}

func printUsage() {
	fmt.Fprintln(os.Stderr, "usage: platform-cli <version|resource-contract|migrate|mock-data>")
}

type route struct {
	Method string `json:"method"`
	Path   string `json:"path"`
}

type contract struct {
	Domain   string `json:"domain"`
	Name     string `json:"name"`
	Path     string `json:"path"`
	PageKind string `json:"pageKind"`
	Mode     string `json:"mode"`
}

type manifest struct {
	Resources []contract `json:"resources"`
	Routes    []route    `json:"routes"`
}

func writeResourceContract(output io.Writer) error {
	gin.SetMode(gin.ReleaseMode)
	engine := gin.New()
	routers.RegisterPlatform(serviceKey, engine)
	routes := make([]route, 0, len(engine.Routes()))
	for _, item := range engine.Routes() {
		routes = append(routes, route{
			Method: item.Method,
			Path:   strings.TrimPrefix(item.Path, "/"+serviceKey+"/platform/v1"),
		})
	}
	expected := platform.ExpectedResources()
	contracts := make([]contract, 0, len(expected))
	for _, item := range expected {
		contracts = append(contracts, contract{
			Domain: item.Domain, Name: item.Name, Path: item.Path,
			PageKind: item.PageKind, Mode: string(item.Mode),
		})
	}
	return json.NewEncoder(output).Encode(manifest{Resources: contracts, Routes: routes})
}

func writeMockData() error {
	config.New("platform")
	if config.Spec.Databases == nil {
		return fmt.Errorf("database configuration is required")
	}
	databaseService, err := database.NewDatabase(
		config.Spec.Databases.Driver,
		config.Spec.Databases.Source,
		nil,
	)
	if err != nil {
		return fmt.Errorf("connect database: %w", err)
	}
	if err := initdb.New(databaseService); err != nil {
		return fmt.Errorf("initialize platform data: %w", err)
	}
	if err := seed.MockData(databaseService); err != nil {
		return fmt.Errorf("write mock data: %w", err)
	}
	return nil
}

func migrateDatabase() error {
	config.New("platform")
	if config.Spec.Databases == nil {
		return fmt.Errorf("database configuration is required")
	}
	var migrationDatabase interface {
		Migrator() gorm.Migrator
	}
	var err error
	switch strings.ToLower(config.Spec.Databases.Driver) {
	case "postgres":
		migrationDatabase, err = database.NewPostgres(config.Spec.Databases.Source, nil)
	case "mysql":
		migrationDatabase, err = database.NewMysql(config.Spec.Databases.Source, nil)
	default:
		return fmt.Errorf("unsupported database driver: %s", config.Spec.Databases.Driver)
	}
	if err != nil {
		return fmt.Errorf("connect database before migration: %w", err)
	}
	const legacyPhoneIndex = "idx_platform_account_phone"
	if migrationDatabase.Migrator().HasIndex(&models.PlatformAccount{}, legacyPhoneIndex) {
		if err := migrationDatabase.Migrator().DropIndex(&models.PlatformAccount{}, legacyPhoneIndex); err != nil {
			return fmt.Errorf("drop legacy platform account phone index: %w", err)
		}
	}
	databaseService, err := database.NewDatabase(
		config.Spec.Databases.Driver,
		config.Spec.Databases.Source,
		nil,
	)
	if err != nil {
		return fmt.Errorf("migrate database: %w", err)
	}
	return initdb.New(databaseService)
}