package blueskyclient

import (
	"errors"
	"fmt"
	"net/http"
	"strings"

	"github.com/charmbracelet/log"
	"github.com/dghubble/sling"
)

type BlueskyConfig struct {
	PDSURL      string `json:"pds-url"`
	Repo        string `json:"repo"`
	Handle      string `json:"handle"`
	DID         string `json:"did"`
	AppPassword string `json:"app-password"`
	AccessJWT   string `json:"access-jwt"`
	RefreshJWT  string `json:"refresh-jwt"`
	Cursor      int64  `json:"cursor"`
}

type DIDResponse struct {
	Context            []string `json:"@context"`
	ID                 string   `json:"id"`
	AlsoKnownAs        []string `json:"alsoKnownAs"`
	VerificationMethod []struct {
		ID                 string `json:"id"`
		Type               string `json:"type"`
		Controller         string `json:"controller"`
		PublicKeyMultibase string `json:"publicKeyMultibase"`
	} `json:"verificationMethod"`
	Service []struct {
		ID              string `json:"id"`
		Type            string `json:"type"`
		ServiceEndpoint string `json:"serviceEndpoint"`
	} `json:"service"`
}

type BSkySessionResponse struct {
	AccessJWT  string `json:"accessJwt,omitempty"`
	RefreshJWT string `json:"refreshJwt,omitempty"`
	Handle     string `json:"handle"`
	DID        string `json:"did"`
	Error      string `json:"error,omitempty"`
	Message    string `json:"message,omitempty"`
}

type CommitResponse struct {
	URI    string `json:"uri"`
	Cid    string `json:"cid"`
	Commit struct {
		Cid string `json:"cid"`
		Rev string `json:"rev"`
	} `json:"commit"`
	Error   string `json:"error"`
	Message string `json:"message"`
}

func (c *CommitResponse) GetRKey() string {
	s := strings.SplitN(c.URI, "/", 5)
	if len(s) == 5 {
		return s[4]
	}
	return ""
}

type Link struct {
	Cid string `json:"cid"`
	URI string `json:"uri"`
}

type Bluesky struct {
	Cfg        *BlueskyConfig
	HttpClient *http.Client
	Logger     *log.Logger
	sling      *sling.Sling
}

func (bluesky *Bluesky) CreateSession(cfg *BlueskyConfig) error {
	body := struct {
		Identifier string `json:"identifier"`
		Password   string `json:"password"`
	}{
		Identifier: cfg.Handle,
		Password:   cfg.AppPassword,
	}
	resp := new(BSkySessionResponse)

	bluesky.sling.New().Post("/xrpc/com.atproto.server.createSession").BodyJSON(body).ReceiveSuccess(resp)
	if resp.AccessJWT != "" {
		cfg.AccessJWT = resp.AccessJWT
		cfg.RefreshJWT = resp.RefreshJWT
		return nil
	}

	bluesky.sling.New().Set("Authorization", fmt.Sprintf("Bearer %s", bluesky.Cfg.AccessJWT))
	return errors.New("unable to authenticate, check handle/password")
}

func (bluesky *Bluesky) RefreshSession() error {
	resp := new(BSkySessionResponse)

	bluesky.sling.New().Set("Authorization", fmt.Sprintf("Bearer %s", bluesky.Cfg.RefreshJWT)).
		Post("/xrpc/com.atproto.server.refreshSession").Receive(resp, resp)
	if resp.AccessJWT != "" {
		bluesky.Cfg.AccessJWT = resp.AccessJWT
		bluesky.Cfg.RefreshJWT = resp.RefreshJWT
		PersistAuthSession(bluesky.Cfg)
		bluesky.sling.Set("Authorization", fmt.Sprintf("Bearer %s", bluesky.Cfg.AccessJWT))
		return nil
	}

	return bluesky.CreateSession(bluesky.Cfg)
}

func (bluesky *Bluesky) CheckSessionValid() {
	resp := new(BSkySessionResponse)

	bluesky.sling.New().Set("Authorization", fmt.Sprintf("Bearer %s", bluesky.Cfg.AccessJWT)).
		Get("/xrpc/app.bsky.actor.getProfile").Receive(resp, resp)
	if resp.Error == "ExpiredToken" {
		bluesky.RefreshSession()
	}
}

func (bluesky *Bluesky) GetPost(uri string) *Post {
	bluesky.CheckSessionValid()
	var post = struct {
		URI   string `json:"uri"`
		CID   string `json:"cid"`
		Value *Post  `json:"value"`
	}{}

	args := strings.SplitN(uri, "/", 5)
	params := struct {
		RKey       string `url:"rkey"`
		Repo       string `url:"repo"`
		Collection string `url:"collection"`
	}{
		RKey:       args[4],
		Repo:       args[2],
		Collection: args[3],
	}
	bluesky.sling.New().Get("/xrpc/com.atproto.repo.getRecord").QueryStruct(params).ReceiveSuccess(&post)

	return post.Value
}

func (bluesky *Bluesky) DeleteRecord(args []string) *CommitResponse {
	bluesky.CheckSessionValid()

	resp := new(CommitResponse)
	params := struct {
		RKey       string `json:"rkey"`
		Repo       string `json:"repo"`
		Collection string `json:"collection"`
	}{
		RKey:       args[0],
		Repo:       args[1],
		Collection: args[2],
	}
	bluesky.sling.New().Set("Authorization", fmt.Sprintf("Bearer %s", bluesky.Cfg.AccessJWT)).
		Post("/xrpc/com.atproto.repo.deleteRecord").BodyJSON(params).Receive(resp, resp)
	return resp
}

func (bluesky *Bluesky) FetchPost(did string, rkey string) FetchedPost {
	resp := FetchedPost{}
	params := struct {
		URIs string `url:"uris"`
	}{
		URIs: fmt.Sprintf("at://%s/app.bsky.feed.post/%s", did, rkey),
	}
	bluesky.sling.New().Base("https://public.api.bsky.app").
		Get("/xrpc/app.bsky.feed.getPosts").QueryStruct(&params).Receive(resp, resp)
	return resp
}