// Package esi provides EVE Online ESI API implementations for planetary interaction data.
package esi

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"time"

	"go-eve-pi/options"

	logger "git.site.quack-lab.dev/dave/cylogger"
)

const (
	ESIBaseURL = "https://esi.evetech.net"
)

type PlanetName struct {
	Name     string `json:"name"`
	PlanetID int    `json:"planet_id"`
	SystemID int    `json:"system_id"`
	TypeID   int    `json:"type_id"`
	Position struct {
		X float64 `json:"x"`
		Y float64 `json:"y"`
		Z float64 `json:"z"`
	} `json:"position"`
}

type FactoryDetails struct {
	SchematicID int `json:"schematic_id"`
}

// ESIInterface defines the contract for ESI API interactions
type ESIInterface interface {
	GetCharacterPlanets(ctx context.Context, characterID int, accessToken string) ([]Planet, error)
	GetPlanetPI(ctx context.Context, characterID int, planetID int64, accessToken string) (*PlanetPI, error)
	GetPlanetName(ctx context.Context, planetID int64) (*PlanetName, error)
}

// DirectESI implements ESIInterface with direct API calls
type DirectESI struct {
	httpClient *http.Client
}

// NewDirectESI creates a new DirectESI instance
func NewDirectESI() *DirectESI {
	// Parse HTTP timeout ONCE at initialization
	httpTimeout, err := time.ParseDuration(options.GlobalOptions.HTTPTimeout)
	if err != nil {
		logger.Error("Invalid HTTP timeout duration %s: %v", options.GlobalOptions.HTTPTimeout, err)
		os.Exit(1)
	}

	return &DirectESI{
		httpClient: &http.Client{
			Timeout: httpTimeout,
		},
	}
}

// GetCharacterPlanets retrieves a list of planets for a character
func (d *DirectESI) GetCharacterPlanets(ctx context.Context, characterID int, accessToken string) ([]Planet, error) {
	funclog := logger.Default.WithPrefix("DirectESI.GetCharacterPlanets").WithPrefix(fmt.Sprintf("characterID=%d", characterID))
	funclog.Debug("Fetching planets")

	url := fmt.Sprintf("%s/v3/characters/%d/planets/", ESIBaseURL, characterID)

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		funclog.Error("Failed to create request for character planets: %v", err)
		return nil, err
	}

	req.Header.Set("Authorization", "Bearer "+accessToken)
	req.Header.Set("Accept", "application/json")

	resp, err := d.httpClient.Do(req)
	if err != nil {
		funclog.Error("Failed to fetch character planets: %v", err)
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		funclog.Error("Character planets API returned status %d: %s", resp.StatusCode, string(body))
		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var planets []Planet
	if err := json.NewDecoder(resp.Body).Decode(&planets); err != nil {
		funclog.Error("Failed to decode character planets response: %v", err)
		return nil, err
	}

	funclog.Info("Successfully fetched %d planets", len(planets))
	return planets, nil
}

// GetPlanetPI retrieves detailed information about a specific planet
func (d *DirectESI) GetPlanetPI(ctx context.Context, characterID int, planetID int64, accessToken string) (*PlanetPI, error) {
	funclog := logger.Default.WithPrefix("DirectESI.GetPlanetPI").WithPrefix(fmt.Sprintf("characterID=%d", characterID)).WithPrefix(fmt.Sprintf("planetID=%d", planetID))
	funclog.Debug("Fetching planet details")

	url := fmt.Sprintf("%s/v3/characters/%d/planets/%d/", ESIBaseURL, characterID, planetID)

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		funclog.Error("Failed to create request for planet details: %v", err)
		return nil, err
	}

	req.Header.Set("Authorization", "Bearer "+accessToken)
	req.Header.Set("Accept", "application/json")

	resp, err := d.httpClient.Do(req)
	if err != nil {
		funclog.Error("Failed to fetch planet details: %v", err)
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		funclog.Error("Planet details API returned status %d: %s", resp.StatusCode, string(body))
		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var pi PlanetPI
	if err := json.NewDecoder(resp.Body).Decode(&pi); err != nil {
		funclog.Error("Failed to decode planet details response: %v", err)
		return nil, err
	}

	funclog.Info("Successfully fetched planet details")
	return &pi, nil
}

// GetPlanetName retrieves planet name from universe endpoint
func (d *DirectESI) GetPlanetName(ctx context.Context, planetID int64) (*PlanetName, error) {
	funclog := logger.Default.WithPrefix("DirectESI.GetPlanetName").WithPrefix(fmt.Sprintf("planetID=%d", planetID))
	funclog.Debug("Fetching planet name")

	url := fmt.Sprintf("%s/v1/universe/planets/%d/", ESIBaseURL, planetID)

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		funclog.Error("Failed to create request for planet name: %v", err)
		return nil, err
	}

	req.Header.Set("Accept", "application/json")

	resp, err := d.httpClient.Do(req)
	if err != nil {
		funclog.Error("Failed to fetch planet name: %v", err)
		return nil, err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		funclog.Error("Failed to read planet name response body: %v", err)
		return nil, err
	}

	if resp.StatusCode != http.StatusOK {
		funclog.Error("API request failed with status %d: %s", resp.StatusCode, string(body))
		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var planetName PlanetName
	if err := json.NewDecoder(bytes.NewReader(body)).Decode(&planetName); err != nil {
		funclog.Error("Failed to decode planet name response: %v", err)
		return nil, err
	}

	funclog.Info("Successfully fetched planet name: %s", planetName.Name)
	return &planetName, nil
}

var _ ESIInterface = &DirectESI{}