package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"

	tle "git.darknebu.la/Satellite/tle"
	"github.com/gorilla/mux"
)

// indexHandler displays an index page
func indexHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "%s", "<h1>TLE2JSON api</h1>")
	fmt.Fprintf(w, "%s", "Usage: Make a get request to /{station}/{name}")
}

// dumpallHandler dumps all categories
func dumpallHandler(w http.ResponseWriter, r *http.Request) {
	log.Println("[ ] Dumping all TLEs")
	dumpall()
	log.Println("[+] Done dumping all TLEs")
}

// get Handler returns the specified TLE
func getHandler(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)

	// read the TLEs from the categories file
	// TODO: Handle caching
	//			- dump all if not present
	//			- if old, fetch from celestrack

	// define where the file containing the spoecified categories lies
	categoryPath := fmt.Sprintf("data/%s.txt", vars["station"])

	// find out if the file exists or not
	if _, err := os.Stat(categoryPath); os.IsNotExist(err) {
		// if it does not exist, download the category
		downloadCategory(vars["station"])
	}

	// open the file containing the data for the individual station
	content, err := ioutil.ReadFile(categoryPath)
	if err != nil {
		log.Printf("Could not open %s", categoryPath)
	}

	lines := strings.Split(string(content), "\n")

	// iterate over all lines searching for the satellite
	var j int
	for i, line := range lines {
		if strings.Contains(line, vars["name"]) {
			j = i
			break
		}
	}

	RawTLE := strings.Join(lines[j:j+3], "\n")

	w.Header().Set("Content-Type", "application/json")

	JSONTLE, err := tle.NewTLE(RawTLE)
	if err != nil {
		fmt.Println(err)
	}

	// convert the TLE to json
	b, err := json.MarshalIndent(JSONTLE, "", " ")
	if err != nil {
		fmt.Println("error: ", err)
	}
	fmt.Fprintf(w, string(b))

}