package main

import (
	"context"
	"fmt"
	"strings"
	"log"
	"encoding/json"
	"github.com/jackc/pgx/pgxpool"
	"time"
	"net/http"
//	"io/ioutil"
//	"github.com/davecgh/go-spew/spew"
)

type ImageType struct {
//	Type	string `json:"type"`
	Url	string `json:"url"`
}

type PublicKeyType struct {
	PublicKeyPem	string `json:"publicKeyPem"`
}

type UserJson struct {
	ID	string `json:"id"`
	Type	string `json:"type"`
	Inbox	string `json:"inbox"`
	Outbox	string `json:"outbox"`
	Followers	string `json:"followers"`
	Following	string `json:"following"`
	Url	string `json:"url"`
	PreferredUsername	string `json:"preferredUsername"`
	Name	string `json:"name"`
	Summary	string `json:"summary"`
	Icon	ImageType `json:"icon"`
	Image	ImageType `json:"image"`
	PublicKey	PublicKeyType `json:"publicKey"`

	instance	string
}

type PostJson struct {
	ID	string `json:"id"`
	InReplyTo	string `json:"inReplyTo"`

	normalized string
	posthash   []byte
	receivedAt time.Time `json:"created_at"`


	Content	string `json:"content"`
	Conversation	string `json:"conversation"`
	Published	time.Time `json:"published"`
	Source	string `json:"source"`
	Summary	string `json:"summary"`
//	Ignoring tag for now
	To		[]string `json:"to"`
	Type	string `json:"type"`

	Actor	string `json:"actor"`
	AttributedTo	string `json:"attributedTo"`

	instance	string
}

type ConnRequest struct {
	conn chan *pgxpool.Conn
	b chan bool
}

func requestConn() {
	conn, _:= pool.Acquire(context.Background())
	defer conn.Release()
	for connRequest := range requestconnchan {
		fmt.Println("Sending request")
		connRequest.conn <-conn
		_ = <-connRequest.b
	}
}

func check_post(uri string) (PostJson, error) {
//	conn, _:= pool.Acquire(context.Background())
//	defer conn.Release()
	connrequest := ConnRequest{}
	connrequest.conn = make(chan *pgxpool.Conn)
	connrequest.b = make(chan bool)
	requestconnchan <- connrequest

	myconn := <-connrequest.conn

	var postjson PostJson

	selectRet := myconn.QueryRow(context.Background(), "SELECT id, inReplyTo, published, summary, content, normalized, attributedto, posthash, received_at FROM posts WHERE id = $1", uri)
	err := selectRet.Scan(&postjson.ID, &postjson.InReplyTo, &postjson.Published, &postjson.Summary, &postjson.Content, &postjson.normalized, &postjson.AttributedTo, &postjson.posthash, &postjson.receivedAt)
	close(connrequest.b)

	if err == nil {
		fmt.Println("First return!")
		return postjson, nil
	}
	log.Print(uri)

	endslash := strings.Index(uri[8:], "/")
	postjson.instance = uri[8:endslash+8]


	client := http.Client{}
	req, _ := http.NewRequest("GET", uri, nil)
	req.Header.Add("Accept", "application/ld+json")

	resp, err := client.Do(req)

	err = json.NewDecoder(resp.Body).Decode(&postjson)
	if err != nil {
		return postjson, err
	}

	if postjson.InReplyTo != "" && postjson.InReplyTo != uri {
		log.Print("GOING INTO NEW POST: ", postjson.InReplyTo)
		go check_post(postjson.InReplyTo)
	}

	check_user(postjson.AttributedTo) // This must be done BEFORE the `INSERT INTO posts` below

	connrequest = ConnRequest{}
	connrequest.conn = make(chan *pgxpool.Conn)
	connrequest.b = make(chan bool)
	requestconnchan <- connrequest

	myconn = <-connrequest.conn

	_, err = myconn.Exec(context.Background(), "INSERT INTO posts (id, inReplyTo, published, summary, content, normalized, attributedto, posthash, instance) VALUES($1, $2, $3, $4, $5, $6, $7, $8, $9)", postjson.ID, postjson.InReplyTo, postjson.Published, postjson.Summary, postjson.Content, postjson.normalized, postjson.AttributedTo, postjson.posthash, postjson.instance)
	close(connrequest.b)
	if err != nil {
		log.Print("INSERT posts ", err)
		return postjson, err
	}

	for _, to := range postjson.To {
		if to != "https://www.w3.org/ns/activitystreams#Public" {
			log.Print("Going into: " + to)
			go check_user(to)
		}
	}

	fmt.Println("Second return")

	return postjson, nil
}

func check_user(uri string) (UserJson, error) {
//	conn, _:= pool.Acquire(context.Background())
//	defer conn.Release()
	connrequest := ConnRequest{}
	connrequest.conn = make(chan *pgxpool.Conn)
	connrequest.b = make(chan bool)
	requestconnchan <- connrequest

	myconn := <-connrequest.conn

	var userjson UserJson

	selectRet := myconn.QueryRow(context.Background(), "SELECT id, actor_type, inbox, outbox, followers, following, url, preferredUsername, name, summary, icon, image, publicKey, instance FROM accounts WHERE id = $1", uri)
	err := selectRet.Scan(&userjson.ID, &userjson.Type, &userjson.Inbox, &userjson.Outbox, &userjson.Followers, &userjson.Following, &userjson.Url, &userjson.PreferredUsername, &userjson.Name, &userjson.Summary, &userjson.Icon.Url, &userjson.Image.Url, &userjson.PublicKey.PublicKeyPem, &userjson.instance)
	close(connrequest.b)

	if err == nil {
		fmt.Println("First return!")
		return userjson, nil
	}
	endslash := strings.Index(uri[8:], "/")
	userjson.instance = uri[8:endslash+8]

	client := http.Client{}
	req, _ := http.NewRequest("GET", uri, nil)
	req.Header.Add("Accept", "application/ld+json")

	resp, err := client.Do(req)
	if err != nil {
		//log.Fatal(err)
		return userjson, err
	}

	err = json.NewDecoder(resp.Body).Decode(&userjson)
	if err != nil {
		//log.Fatal(err)
		return userjson, err
	}

	connrequest = ConnRequest{}
	connrequest.conn = make(chan *pgxpool.Conn)
	connrequest.b = make(chan bool)
	requestconnchan <- connrequest

	myconn = <-connrequest.conn
	_, err = myconn.Exec(context.Background(), "INSERT INTO accounts (id, actor_type, inbox, outbox, followers, following, url, preferredUsername, name, summary, icon, image, publicKey, instance) VALUES($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)", userjson.ID, userjson.Type, userjson.Inbox, userjson.Outbox, userjson.Followers, userjson.Following, userjson.Url, userjson.PreferredUsername, userjson.Name, userjson.Summary, userjson.Icon.Url, userjson.Image.Url, userjson.PublicKey.PublicKeyPem, userjson.instance)
	close(connrequest.b)
	if err != nil {
		//log.Fatal("INSERT accounts ", err)
		return userjson, err
	}

	fmt.Println("Second return")

	return userjson, nil
}

//var pool *pgxpool.Pool

/*
func main() {
	getDbPool()

//	userjson := check_user("https://islamicate.space/users/fikran")
//	_ = check_user("https://social.farhan.codes/users/testacct555")
//	postjson := spew.Dump(userjson)

	postjson, err := check_post("https://social.farhan.codes/objects/39cb2c26-153e-4e2e-bb3e-4d6971c04df1")

	if err != nil {
		log.Fatal("The error is: ", err)
	}

	fmt.Println(postjson)

//	check_post("https://honk.tedunangst.com/u/tedu/h/v1Mz2rgpw1b45g99vS")
}
*/