// Package client provides the core Yandex Music API client and related types.
package client

import (
	"context"
	"fmt"
	"time"

	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/models"
	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/utils"
)

// ClientConfig holds configuration for the Client.
type ClientConfig struct {
	Token               string
	BaseURL             string
	ProxyURL            string
	Timeout             int
	Language            string
	ReportUnknownFields bool
	Strict              bool
	OnSchemaMismatch    utils.SchemaMismatchHandler
	JSONBackend         utils.JSONBackend
}

// Client is the main Yandex Music API client.
// It provides methods for interacting with the Yandex Music API,
// including tracks, albums, artists, playlists, radio, and more.
type Client struct {
	config     ClientConfig
	request    *Request
	device     string
	me         *Status
	accountUID *int64
}

// NewClient creates a new Yandex Music client with the given configuration.
// If BaseURL, Language, or Timeout are not set in the config, sensible defaults are used.
func NewClient(config ClientConfig) *Client {
	if config.BaseURL == "" {
		config.BaseURL = DefaultBaseURL
	}
	if config.Language == "" {
		config.Language = "ru"
	}
	if config.Timeout == 0 {
		config.Timeout = int(DefaultTimeout.Seconds())
	}

	device := fmt.Sprintf("os=Go; os_version=; manufacturer=Mrixs; model=Yandex Music API Go; clid=; device_id=go-client; uuid=go-client")

	reqConfig := RequestConfig{
		BaseURL:             config.BaseURL,
		Token:               config.Token,
		ProxyURL:            config.ProxyURL,
		Timeout:             time.Duration(config.Timeout) * time.Second,
		Language:            config.Language,
		JSONBackend:         config.JSONBackend,
		ReportUnknownFields: config.ReportUnknownFields,
		Strict:              config.Strict,
		OnSchemaMismatch:    config.OnSchemaMismatch,
	}

	request := NewRequest(reqConfig)

	return &Client{
		config:  config,
		request: request,
		device:  device,
	}
}

// Init initializes the client by fetching account info from the /account/status endpoint.
// It populates the client's internal account state (GetMe and GetAccountUID).
func (c *Client) Init(ctx context.Context) error {
	status, err := c.GetAccountStatus(ctx)
	if err != nil {
		return err
	}
	c.me = status
	if status.Account != nil {
		c.accountUID = &status.Account.UID
	}
	return nil
}

// GetRequest returns the underlying request handler used by this client.
// The returned RequestInterface can be used to make raw API requests.
func (c *Client) GetRequest() models.RequestInterface {
	return c.request
}

// GetToken returns the current OAuth token used for authentication.
func (c *Client) GetToken() string {
	return c.config.Token
}

// SetToken updates the OAuth token used for authentication.
// It also updates the underlying request handler's authorization header.
func (c *Client) SetToken(token string) {
	c.config.Token = token
	c.request.SetToken(token)
}

// GetDevice returns the device identifier string used in API requests.
func (c *Client) GetDevice() string {
	return c.device
}

// GetMe returns the account status fetched during Init, or nil if Init has not been called.
func (c *Client) GetMe() *Status {
	return c.me
}

// GetAccountUID returns the authenticated user's account UID, or nil if not available.
func (c *Client) GetAccountUID() *int64 {
	return c.accountUID
}

// Context returns a context for requests (can be overridden for timeouts).
// By default it returns context.Background().
func (c *Client) Context() context.Context {
	return context.Background()
}

// WithContext returns a new client with a custom context.
// In Go, context is typically passed to each method rather than stored, so this returns the same client.
func (c *Client) WithContext(ctx context.Context) *Client {
	// In Go, we typically pass context to each method rather than storing it
	return c
}

// DeviceAuth performs OAuth Device Flow authentication.
// The onCode callback is invoked with the device code so the user can authorize on a separate device.
func (c *Client) DeviceAuth(ctx context.Context, onCode func(*DeviceCode)) (*OAuthToken, error) {
	return c.request.DeviceAuth(ctx, onCode)
}

// RefreshToken refreshes the access token using the provided refresh token.
// It delegates to the underlying request handler.
func (c *Client) RefreshToken(ctx context.Context, refreshToken string) (*OAuthToken, error) {
	return c.request.RefreshToken(ctx, refreshToken)
}

// Status represents account status returned by the /account/status endpoint.
type Status struct {
	Account *Account `json:"account"`
}

// Account represents a user account.
type Account struct {
	UID         int64  `json:"uid"`
	Login       string `json:"login"`
	DisplayName string `json:"display_name"`
}

// Track represents a music track (minimal subset of fields).
type Track struct {
	ID       string `json:"id"`
	Title    string `json:"title"`
	Duration int    `json:"duration_ms"`
}