/*
Copyright © 2025 MAX THE WEB
*/
package cmd

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"time"

	"github.com/BurntSushi/toml"
	"github.com/spf13/cobra"
)

// Config structure
type Config struct {
	BearerToken string `toml:"bearer_token"`
	API         struct {
		BaseURL string `toml:"base_url"`
		Timeout int    `toml:"timeout"`
	} `toml:"api"`
	Limits struct {
		MonthlyReads int `toml:"monthly_reads"`
		MonthlyPosts int `toml:"monthly_posts"`
	} `toml:"limits"`
}

// IntOrString handles JSON fields that can be either int or string
type IntOrString int

func (i *IntOrString) UnmarshalJSON(data []byte) error {
	// Try to unmarshal as int first
	var intVal int
	if err := json.Unmarshal(data, &intVal); err == nil {
		*i = IntOrString(intVal)
		return nil
	}

	// If that fails, try string
	var strVal string
	if err := json.Unmarshal(data, &strVal); err != nil {
		return err
	}

	// Convert string to int
	parsed, err := strconv.Atoi(strVal)
	if err != nil {
		return err
	}
	*i = IntOrString(parsed)
	return nil
}

// UsageResponse from X API
type UsageResponse struct {
	Data struct {
		ProjectCap   IntOrString `json:"project_cap"`    // Total monthly quota
		ProjectUsage IntOrString `json:"project_usage"` // Already consumed
		CapResetDay  int         `json:"cap_reset_day"`  // Days until reset
		ProjectID    string      `json:"project_id"`     // Project identifier
	} `json:"data"`
}

var statusDays int

// statusCmd represents the status command
var statusCmd = &cobra.Command{
	Use:   "status",
	Short: "Check X API quota and rate limits",
	Long: `Shows your current X API usage status including:
- Monthly quota usage (total API operations)
- Time until quota reset
- Current rate limit window status`,
	Run: func(cmd *cobra.Command, args []string) {
		runStatus()
	},
}

func init() {
	rootCmd.AddCommand(statusCmd)
	statusCmd.Flags().IntVarP(&statusDays, "days", "d", 7, "Number of days of usage history (1-90)")
}

func runStatus() {
	// Load configuration
	config, err := loadConfig()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error loading config: %v\n", err)
		fmt.Println("Run 'xapi login' to configure your credentials")
		os.Exit(1)
	}

	// Check if token is configured
	if config.BearerToken == "" || config.BearerToken == "YOUR_BEARER_TOKEN_HERE" {
		fmt.Fprintf(os.Stderr, "Bearer token not configured\n")
		fmt.Println("Run 'xapi login' to configure your credentials")
		os.Exit(1)
	}

	// Create HTTP client
	client := &http.Client{
		Timeout: time.Duration(config.API.Timeout) * time.Second,
	}

	// Validate days parameter
	if statusDays < 1 || statusDays > 90 {
		fmt.Fprintf(os.Stderr, "Error: --days must be between 1 and 90\n")
		os.Exit(1)
	}

	// Build API URL with days parameter
	apiURL := fmt.Sprintf("%s/usage/tweets?days=%d", config.API.BaseURL, statusDays)

	// Make API request to usage endpoint
	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error creating request: %v\n", err)
		os.Exit(1)
	}

	req.Header.Set("Authorization", "Bearer "+config.BearerToken)

	// Execute request
	resp, err := client.Do(req)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error making API request: %v\n", err)
		os.Exit(1)
	}
	defer resp.Body.Close()

	// Check status code
	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		fmt.Fprintf(os.Stderr, "API error (status %d): %s\n", resp.StatusCode, string(body))
		os.Exit(1)
	}

	// Parse response
	var usage UsageResponse
	if err := json.NewDecoder(resp.Body).Decode(&usage); err != nil {
		fmt.Fprintf(os.Stderr, "Error parsing response: %v\n", err)
		os.Exit(1)
	}

	// Display status
	displayStatus(usage, resp.Header, config)
}

func loadConfig() (*Config, error) {
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return nil, err
	}

	configFile := filepath.Join(homeDir, ".config", "xapi", "config.toml")

	var config Config
	if _, err := toml.DecodeFile(configFile, &config); err != nil {
		return nil, err
	}

	// Set defaults if not specified
	if config.API.BaseURL == "" {
		config.API.BaseURL = "https://api.x.com/2"
	}
	if config.API.Timeout == 0 {
		config.API.Timeout = 30
	}
	if config.Limits.MonthlyReads == 0 {
		config.Limits.MonthlyReads = 100
	}
	if config.Limits.MonthlyPosts == 0 {
		config.Limits.MonthlyPosts = 500
	}

	return &config, nil
}

func displayStatus(usage UsageResponse, headers http.Header, config *Config) {
	fmt.Println("\n📊 MONTHLY QUOTA STATUS")
	fmt.Println("═══════════════════════")

	// Calculate usage (convert IntOrString to int)
	cap := int(usage.Data.ProjectCap)
	used := int(usage.Data.ProjectUsage)
	remaining := cap - used
	percentage := float64(used) / float64(cap) * 100

	// Display quota (clarify these are total API operations)
	fmt.Printf("├─ Type: %s Tier (%d total operations/month)\n", getAccessTier(cap), cap)
	fmt.Printf("├─ Used: %d / %d operations (%.1f%%)\n", used, cap, percentage)
	fmt.Printf("├─ Remaining: %d operations\n", remaining)
	fmt.Printf("└─ Resets in: %d days\n", usage.Data.CapResetDay)

	// Display rate limit headers
	fmt.Println("\n⏱️  15-MIN RATE WINDOW")
	fmt.Println("═════════════════════")

	limit := headers.Get("x-rate-limit-limit")
	remainingRate := headers.Get("x-rate-limit-remaining")
	reset := headers.Get("x-rate-limit-reset")

	if limit != "" {
		fmt.Printf("├─ Requests: %s / %s available\n", remainingRate, limit)
	}

	if reset != "" {
		resetTime, _ := strconv.ParseInt(reset, 10, 64)
		resetAt := time.Unix(resetTime, 0)
		timeUntil := time.Until(resetAt)
		fmt.Printf("└─ Resets in: %s\n", formatDuration(timeUntil))
	}

	// Display recommendations
	fmt.Println("\n💡 RECOMMENDATIONS")
	fmt.Println("═════════════════")

	if remaining > 0 {
		daysLeft := usage.Data.CapResetDay
		if daysLeft > 0 {
			dailyBudget := float64(remaining) / float64(daysLeft)
			fmt.Printf("├─ You have %d operations left for %d days\n", remaining, daysLeft)
			fmt.Printf("├─ That's ~%.1f operations per day\n", dailyBudget)
			fmt.Printf("└─ Each search query will consume 1 operation\n")
		}
	} else {
		fmt.Println("└─ ⚠️  No operations remaining! Consider upgrading your plan.")
	}

	fmt.Println()
}

// getAccessTier determines the access tier based on monthly cap
func getAccessTier(cap int) string {
	switch {
	case cap <= 100:
		return "Free"
	case cap <= 10000:
		return "Basic"
	case cap <= 1000000:
		return "Pro"
	default:
		return "Enterprise"
	}
}

func formatDuration(d time.Duration) string {
	if d < 0 {
		return "0 seconds"
	}

	minutes := int(d.Minutes())
	seconds := int(d.Seconds()) % 60

	if minutes > 0 {
		return fmt.Sprintf("%d minutes %d seconds", minutes, seconds)
	}
	return fmt.Sprintf("%d seconds", seconds)
}