// 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"
	deliverylogic "git.apinb.com/heqiapp/platforms/backend/api/internal/logic/delivery"
	gaslogic "git.apinb.com/heqiapp/platforms/backend/api/internal/logic/gas"
	"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 "gas-resource-contract":
		if err := writeGasResourceContract(os.Stdout); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
	case "delivery-resource-contract":
		if err := writeDeliveryResourceContract(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|gas-resource-contract|delivery-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 writeGasResourceContract(output io.Writer) error {
	gin.SetMode(gin.ReleaseMode)
	engine := gin.New()
	routers.RegisterGas(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+"/gas/v1"),
		})
	}
	expected := gaslogic.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 writeDeliveryResourceContract(output io.Writer) error {
	gin.SetMode(gin.ReleaseMode)
	engine := gin.New()
	routers.RegisterDelivery(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+"/delivery/v1"),
		})
	}
	expected := deliverylogic.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: item.Mode,
		})
	}
	return json.NewEncoder(output).Encode(manifest{Resources: contracts, Routes: routes})
}

func writeMockData() error {
	config.New("heqi")
	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("heqi")
	if config.Spec.Databases == nil {
		return fmt.Errorf("database configuration is required")
	}
	var migrationDatabase *gorm.DB
	var err error
	driver := strings.ToLower(config.Spec.Databases.Driver)
	switch 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)
	}
	if err := prepareAdditiveMigrations(migrationDatabase, driver); err != nil {
		return err
	}
	if err := rejectLegacyPaymentSchema(migrationDatabase); err != nil {
		return 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)
}

// rejectLegacyPaymentSchema 阻止通用迁移物理删除历史资金表。
// 旧支付事实必须通过单独评审的数据迁移保留和对账，不能由 migrate 命令静默重置。
func rejectLegacyPaymentSchema(databaseService *gorm.DB) error {
	for _, table := range []string{"wallet_refund", "wallet_payment", "gasorder_payment"} {
		if databaseService.Migrator().HasTable(table) {
			return fmt.Errorf("检测到历史资金表 %s：请先执行经财务与审计批准的保留式迁移", table)
		}
	}
	return nil
}

// prepareAdditiveMigrations 先处理无法由 GORM AutoMigrate 安全完成的新增非空字段。
// 旧轨迹没有服务端接收时间时，以定位发生时间（再退化到创建时间）回填，
// 避免直接 ADD NOT NULL 因历史行存在而中断整库迁移。
func prepareAdditiveMigrations(databaseService *gorm.DB, driver string) error {
	if !databaseService.Migrator().HasTable(&models.GasorderTrackPoint{}) {
		return nil
	}

	var statements []string
	hasReceivedAt := databaseService.Migrator().HasColumn(&models.GasorderTrackPoint{}, "received_at")
	switch driver {
	case "postgres":
		if !hasReceivedAt {
			statements = append(statements, `ALTER TABLE "gasorder_track_point" ADD COLUMN "received_at" timestamptz`)
		}
		statements = append(statements,
			`UPDATE "gasorder_track_point" SET "received_at" = COALESCE("occurred_at", "created_at", CURRENT_TIMESTAMP) WHERE "received_at" IS NULL`,
			`ALTER TABLE "gasorder_track_point" ALTER COLUMN "received_at" SET NOT NULL`,
		)
	case "mysql":
		if !hasReceivedAt {
			statements = append(statements, "ALTER TABLE `gasorder_track_point` ADD COLUMN `received_at` datetime(3) NULL")
		}
		statements = append(statements,
			"UPDATE `gasorder_track_point` SET `received_at` = COALESCE(`occurred_at`, `created_at`, CURRENT_TIMESTAMP(3)) WHERE `received_at` IS NULL",
			"ALTER TABLE `gasorder_track_point` MODIFY COLUMN `received_at` datetime(3) NOT NULL",
		)
	default:
		return fmt.Errorf("unsupported database driver for additive migrations: %s", driver)
	}
	for _, statement := range statements {
		if err := databaseService.Exec(statement).Error; err != nil {
			return fmt.Errorf("backfill gasorder_track_point.received_at: %w", err)
		}
	}
	return nil
}