// Package clients provides third-party printer integrations.
package clients

import (
	"context"
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"
	"time"
)

// MoonrakerPrinterInfo represents the response from /api/printer/info.
type MoonrakerPrinterInfo struct {
	State      string `json:"state"`
	Hostname   string `json:"hostname,omitempty"`
	SoftwareVersion string `json:"software_version,omitempty"`
}

// MoonrakerPrintStats represents the response from /api/printer/print_stats.
type MoonrakerPrintStats struct {
	State            string  `json:"state"`
	Filename         string  `json:"filename,omitempty"`
	FilamentUsedMm   float64 `json:"filament_used,omitempty"`
	TotalDuration    float64 `json:"total_duration,omitempty"`
	PrintDuration    float64 `json:"print_duration,omitempty"`
	Message          string  `json:"message,omitempty"`
}

// MoonrakerPrintJob represents a single job from the history API.
type MoonrakerPrintJob struct {
	JobID          string    `json:"job_id,omitempty"`
	Filename       string    `json:"filename"`
	Status         string    `json:"status"`
	StartTime      time.Time `json:"start_time"`
	EndTime        time.Time `json:"end_time,omitempty"`
	FilamentUsedMm float64   `json:"filament_used,omitempty"`
	TotalDuration  float64   `json:"total_duration,omitempty"`
}

// MoonrakerHistoryResponse represents the response from /api/server/history/job.
type MoonrakerHistoryResponse struct {
	Items []MoonrakerPrintJob `json:"jobs"`
}

// MoonrakerClient is an HTTP client for the Moonraker API.
type MoonrakerClient struct {
	HTTPClient *http.Client
}

// NewMoonrakerClient creates a MoonrakerClient with the given request timeout.
func NewMoonrakerClient(timeout time.Duration) *MoonrakerClient {
	return &MoonrakerClient{
		HTTPClient: &http.Client{Timeout: timeout},
	}
}

// baseURL builds the Moonraker base URL from host and port.
func (c *MoonrakerClient) baseURL(host string, port int) string {
	if port == 0 {
		port = 80
	}
	return fmt.Sprintf("http://%s:%d", host, port)
}

// GetPrinterInfo fetches printer info from Moonraker.
func (c *MoonrakerClient) GetPrinterInfo(ctx context.Context, host string, port int, apiKey string) (*MoonrakerPrinterInfo, error) {
	url := c.baseURL(host, port) + "/api/printer/info"
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, err
	}
	if apiKey != "" {
		req.Header.Set("X-Api-Key", apiKey)
	}

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("moonraker getPrinterInfo request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("moonraker getPrinterInfo returned status %d", resp.StatusCode)
	}

	var body struct {
		Result MoonrakerPrinterInfo `json:"result"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
		return nil, fmt.Errorf("moonraker getPrinterInfo decode failed: %w", err)
	}

	slog.Debug("moonraker printer info", "host", host, "state", body.Result.State)
	return &body.Result, nil
}

// GetPrintStats fetches current print statistics from Moonraker.
func (c *MoonrakerClient) GetPrintStats(ctx context.Context, host string, port int, apiKey string) (*MoonrakerPrintStats, error) {
	url := c.baseURL(host, port) + "/api/printer/print_stats"
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, err
	}
	if apiKey != "" {
		req.Header.Set("X-Api-Key", apiKey)
	}

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("moonraker getPrintStats request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("moonraker getPrintStats returned status %d", resp.StatusCode)
	}

	var body struct {
		Result MoonrakerPrintStats `json:"result"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
		return nil, fmt.Errorf("moonraker getPrintStats decode failed: %w", err)
	}

	slog.Debug("moonraker print stats", "host", host, "state", body.Result.State, "filename", body.Result.Filename)
	return &body.Result, nil
}

// GetPrintHistory fetches completed print job history from Moonraker.
func (c *MoonrakerClient) GetPrintHistory(ctx context.Context, host string, port int, apiKey string, limit int) (*MoonrakerHistoryResponse, error) {
	if limit <= 0 {
		limit = 25
	}
	url := fmt.Sprintf("%s/api/server/history/job?limit=%d", c.baseURL(host, port), limit)
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, err
	}
	if apiKey != "" {
		req.Header.Set("X-Api-Key", apiKey)
	}

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("moonraker getPrintHistory request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("moonraker getPrintHistory returned status %d", resp.StatusCode)
	}

	var body MoonrakerHistoryResponse
	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
		return nil, fmt.Errorf("moonraker getPrintHistory decode failed: %w", err)
	}

	slog.Debug("moonraker print history", "host", host, "count", len(body.Items))
	return &body, nil
}