package config

import (
	"flag"
	"fmt"
	"os"
	"time"

	"gopkg.in/yaml.v3"
)

type Config struct {
	Version      int                      `yaml:"version"`
	Env          string                   `yaml:"env"`
	Project      string                   `yaml:"project"`
	Region       string                   `yaml:"region"`
	Platform     PlatformConfig           `yaml:"platform"`
	Database     DatabaseConfig           `yaml:"database"`
	Cache        CacheConfig              `yaml:"cache"`
	Queue        QueueConfig              `yaml:"queue"`
	Deploy       DeployConfig             `yaml:"deploy"`
	Build        BuildConfig              `yaml:"build"`
	TencentCloud TencentCloudConfig       `yaml:"tencentcloud"`
	COS          COSConfig                `yaml:"cos"`
	TAT          TATConfig                `yaml:"tat"`
	Release      ReleaseConfig            `yaml:"release"`
	Services     map[string]ServiceConfig `yaml:"services"`
}

type PlatformConfig struct {
	Name       string `yaml:"name"`
	HTTPPort   string `yaml:"http_port"`
	CORSOrigin string `yaml:"cors_origin"`
}

type DatabaseConfig struct {
	DSN string `yaml:"dsn"`
}

type CacheConfig struct {
	RedisAddr     string `yaml:"redis_addr"`
	RedisPassword string `yaml:"redis_password"`
}

type QueueConfig struct {
	Driver             string `yaml:"driver"`
	RocketMQNameserver string `yaml:"rocketmq_nameserver"`
	Topic              string `yaml:"topic"`
	Group              string `yaml:"group"`
}

type DeployConfig struct {
	HealthcheckInterval string `yaml:"healthcheck_interval"`
	ScriptWorkDir       string `yaml:"script_work_dir"`
	OperatorScript      string `yaml:"operator_script"`
	ConfigPath          string `yaml:"config_path"`
}

type BuildConfig struct {
	ScriptWorkDir    string   `yaml:"script_work_dir"`
	OperatorScript   string   `yaml:"operator_script"`
	WorkspaceRoot    string   `yaml:"workspace_root"`
	RepoSearchRoots  []string `yaml:"repo_search_roots"`
	GiteaClonePrefix string   `yaml:"gitea_clone_prefix"`
	GitSSHCommand    string   `yaml:"git_ssh_command"`
	BuildHost        string   `yaml:"build_host"`
}

type TencentCloudConfig struct {
	SecretID     string `yaml:"secret_id"`
	SecretKey    string `yaml:"secret_key"`
	SessionToken string `yaml:"session_token"`
}

type COSConfig struct {
	Region         string `yaml:"region"`
	Bucket         string `yaml:"bucket"`
	ReleasesPrefix string `yaml:"releases_prefix"`
	StatePrefix    string `yaml:"state_prefix"`
	OutputPrefix   string `yaml:"output_prefix"`
}

type TATConfig struct {
	Region           string `yaml:"region"`
	CommandName      string `yaml:"command_name"`
	CommandType      string `yaml:"command_type"`
	WorkingDirectory string `yaml:"working_directory"`
	ScriptPath       string `yaml:"script_path"`
	TimeoutSeconds   int    `yaml:"timeout_seconds"`
	ExecutionUser    string `yaml:"execution_user"`
}

type ReleaseConfig struct {
	Order []string `yaml:"order"`
}

type ServiceConfig struct {
	Repo        string        `yaml:"repo"`
	PackageName string        `yaml:"package_name"`
	DeployRoot  string        `yaml:"deploy_root"`
	UnitName    string        `yaml:"unit_name"`
	HealthURL   string        `yaml:"health_url"`
	HTTPPort    int           `yaml:"http_port"`
	GRPCPort    int           `yaml:"grpc_port"`
	Rollout     RolloutConfig `yaml:"rollout"`
	Build       ServiceBuild  `yaml:"build"`
	Instances   []InstanceRef `yaml:"instances"`
	CLB         CLBConfig     `yaml:"clb"`
}

type ServiceBuild struct {
	RepoURL        string   `yaml:"repo_url"`
	RepoCandidates []string `yaml:"repo_candidates"`
	DefaultBranch  string   `yaml:"default_branch"`
	WorkDir        string   `yaml:"work_dir"`
	BinaryName     string   `yaml:"binary_name"`
	BuildTarget    string   `yaml:"build_target"`
	ConfigSource   string   `yaml:"config_source"`
	BuildCommand   string   `yaml:"build_command"`
}

type RolloutConfig struct {
	BatchSize    int `yaml:"batch_size"`
	DrainSeconds int `yaml:"drain_seconds"`
	PauseSeconds int `yaml:"pause_seconds"`
}

type InstanceRef struct {
	InstanceID string `yaml:"instance_id"`
	Name       string `yaml:"name"`
	PrivateIP  string `yaml:"private_ip"`
}

type CLBConfig struct {
	LoadBalancerID string      `yaml:"load_balancer_id"`
	ListenerID     string      `yaml:"listener_id"`
	LocationID     string      `yaml:"location_id"`
	Domain         string      `yaml:"domain"`
	URL            string      `yaml:"url"`
	BackendPort    int         `yaml:"backend_port"`
	OriginalWeight int         `yaml:"original_weight"`
	Targets        []CLBTarget `yaml:"targets"`
}

type CLBTarget struct {
	InstanceID string `yaml:"instance_id"`
	PrivateIP  string `yaml:"private_ip"`
	Port       int    `yaml:"port"`
	Weight     int    `yaml:"weight"`
}

func Load() Config {
	configPath := "config/prod.yaml"
	flag.StringVar(&configPath, "config", configPath, "config yaml path")
	flag.Parse()

	data, err := os.ReadFile(configPath)
	if err != nil {
		panic(fmt.Errorf("read config: %w", err))
	}

	var cfg Config
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		panic(fmt.Errorf("parse config: %w", err))
	}

	if cfg.Platform.Name == "" {
		cfg.Platform.Name = "app-deploy-platform"
	}
	if cfg.Platform.HTTPPort == "" {
		cfg.Platform.HTTPPort = "8080"
	}
	if cfg.Platform.CORSOrigin == "" {
		cfg.Platform.CORSOrigin = "*"
	}
	if cfg.Queue.Driver == "" {
		cfg.Queue.Driver = "rocketmq"
	}
	if cfg.Queue.Topic == "" {
		cfg.Queue.Topic = "app-deploy-platform.deployments"
	}
	if cfg.Queue.Group == "" {
		cfg.Queue.Group = "app-deploy-platform.backend"
	}
	if cfg.Deploy.ConfigPath == "" {
		cfg.Deploy.ConfigPath = configPath
	}
	if cfg.Build.ScriptWorkDir == "" {
		cfg.Build.ScriptWorkDir = cfg.Deploy.ScriptWorkDir
	}
	if cfg.Build.BuildHost == "" {
		cfg.Build.BuildHost = "build-node"
	}
	return cfg
}

func (c Config) HealthcheckIntervalDuration() time.Duration {
	if c.Deploy.HealthcheckInterval == "" {
		return 10 * time.Second
	}

	value, err := time.ParseDuration(c.Deploy.HealthcheckInterval)
	if err != nil {
		return 10 * time.Second
	}
	return value
}