package server

import (
	"fmt"

	"git.riou.xyz/jriou/coller/internal"
)

type Config struct {
	Title                 string   `json:"title"`
	DatabaseType          string   `json:"database_type"`
	DatabaseDsn           string   `json:"database_dsn"`
	IDLength              int      `json:"id_length"`
	PasswordLength        int      `json:"password_length"`
	ExpirationInterval    int      `json:"expiration_interval"`
	ListenAddress         string   `json:"listen_address"`
	ListenPort            int      `json:"listen_port"`
	Expirations           []int    `json:"expirations"`
	Expiration            int      `json:"expiration"`
	MaxUploadSize         int64    `json:"max_upload_size"`
	ShowVersion           bool     `json:"show_version"`
	EnableMetrics         bool     `json:"enable_metrics"`
	PrometheusRoute       string   `json:"prometheus_route"`
	PrometheusNotesMetric string   `json:"prometheus_notes_metric"`
	ObservationInterval   int      `json:"observation_internal"`
	Languages             []string `json:"languages"`
	Language              string   `json:"language"`
	UploadFileButton      bool     `json:"upload_file_button"`
}

func NewConfig() *Config {
	return &Config{
		Title:              "Coller",
		DatabaseType:       "sqlite",
		DatabaseDsn:        "collerd.db",
		IDLength:           5,
		PasswordLength:     16,
		ExpirationInterval: 60, // 1 minute
		ListenAddress:      "0.0.0.0",
		ListenPort:         8080,
		Expirations: []int{
			300,      // 5 minutes
			3600,     // 1 hour
			86400,    // 1 day
			604800,   // 7 days
			18144000, // 30 days
		},
		Expiration:            604800,   // 7 days
		MaxUploadSize:         10485760, // 10MiB (encoded)
		ShowVersion:           false,
		EnableMetrics:         true,
		PrometheusRoute:       "/metrics",
		PrometheusNotesMetric: "collerd_notes",
		ObservationInterval:   60,
		Languages: []string{
			"Text",
			"CSS",
			"Dockerfile",
			"Go",
			"HCL",
			"HTML",
			"Javascript",
			"JSON",
			"Markdown",
			"Perl",
			"Python",
			"Ruby",
			"Rust",
			"Shell",
			"SQL",
			"YAML",
		},
		Language:         "text",
		UploadFileButton: true,
	}
}

func (c *Config) Check() error {
	if len(c.Expirations) == 0 {
		return fmt.Errorf("expirations are required")
	}
	for _, e := range c.Expirations {
		if e <= 0 {
			return fmt.Errorf("invalid expiration %d: must be greater than zero", e)
		}
	}

	if c.IDLength <= 0 {
		return fmt.Errorf("identifiers length must be greater than zero")
	}

	if c.PasswordLength < internal.MIN_PASSWORD_LENGTH || c.PasswordLength > internal.MAX_PASSWORD_LENGTH {
		return fmt.Errorf("password length must be between %d and %d", internal.MIN_PASSWORD_LENGTH, internal.MAX_PASSWORD_LENGTH)
	}
	return nil
}