package labels

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"

	"github.com/frenocorp/pop/internal/api"
)

type Client struct {
	apiClient *api.ProtonMailClient
	baseURL   string
}

func NewClient(apiClient *api.ProtonMailClient) *Client {
	return &Client{
		apiClient: apiClient,
		baseURL:   apiClient.GetBaseURL(),
	}
}

// --- Folders ---

func (c *Client) ListFolders() (*ListFoldersResponse, error) {
	reqURL := fmt.Sprintf("%s/api/folders", c.baseURL)
	httpReq, err := http.NewRequest("GET", reqURL, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Accept", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to list folders: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result ListFoldersResponse
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result, nil
}

func (c *Client) GetFolder(folderID string) (*Folder, error) {
	reqURL := fmt.Sprintf("%s/api/folders/%s", c.baseURL, url.QueryEscape(folderID))
	httpReq, err := http.NewRequest("GET", reqURL, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Accept", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to get folder: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result struct {
		Data Folder `json:"Data"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result.Data, nil
}

func (c *Client) CreateFolder(req CreateFolderRequest) (*Folder, error) {
	if req.Name == "" {
		return nil, fmt.Errorf("folder name is required")
	}

	body, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/folders", c.baseURL)
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(body))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to create folder: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result struct {
		Data Folder `json:"Data"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result.Data, nil
}

func (c *Client) UpdateFolder(folderID string, req UpdateFolderRequest) (*Folder, error) {
	body, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/folders/%s", c.baseURL, url.QueryEscape(folderID))
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(body))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to update folder: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result struct {
		Data Folder `json:"Data"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result.Data, nil
}

func (c *Client) DeleteFolder(folderID string) error {
	reqURL := fmt.Sprintf("%s/api/folders/%s", c.baseURL, url.QueryEscape(folderID))
	httpReq, err := http.NewRequest("POST", reqURL, nil)
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return fmt.Errorf("failed to delete folder: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("delete failed (status %d): %s", resp.StatusCode, string(body))
	}

	return nil
}

// --- Labels ---

func (c *Client) ListLabels() (*ListLabelsResponse, error) {
	reqURL := fmt.Sprintf("%s/api/labels", c.baseURL)
	httpReq, err := http.NewRequest("GET", reqURL, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Accept", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to list labels: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result ListLabelsResponse
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result, nil
}

func (c *Client) CreateLabel(req CreateLabelRequest) (*Label, error) {
	if req.Name == "" {
		return nil, fmt.Errorf("label name is required")
	}

	body, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/labels", c.baseURL)
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(body))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to create label: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result struct {
		Data Label `json:"Data"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result.Data, nil
}

func (c *Client) UpdateLabel(labelID string, req UpdateLabelRequest) (*Label, error) {
	body, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/labels/%s", c.baseURL, url.QueryEscape(labelID))
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(body))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to update label: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	var result struct {
		Data Label `json:"Data"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return &result.Data, nil
}

func (c *Client) DeleteLabel(labelID string) error {
	reqURL := fmt.Sprintf("%s/api/labels/%s", c.baseURL, url.QueryEscape(labelID))
	httpReq, err := http.NewRequest("POST", reqURL, nil)
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return fmt.Errorf("failed to delete label: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("delete failed (status %d): %s", resp.StatusCode, string(body))
	}

	return nil
}

// --- Message Labels ---

func (c *Client) ApplyLabel(messageID, labelID string) error {
	if messageID == "" || labelID == "" {
		return fmt.Errorf("message ID and label ID are required")
	}

	body := map[string]string{
		"LabelID": labelID,
	}
	jsonBody, err := json.Marshal(body)
	if err != nil {
		return fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/messages/%s/setlabel", c.baseURL, url.QueryEscape(messageID))
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(jsonBody))
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return fmt.Errorf("failed to apply label: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("apply label failed (status %d): %s", resp.StatusCode, string(body))
	}

	return nil
}

func (c *Client) RemoveLabel(messageID, labelID string) error {
	if messageID == "" || labelID == "" {
		return fmt.Errorf("message ID and label ID are required")
	}

	body := map[string]string{
		"LabelID": labelID,
	}
	jsonBody, err := json.Marshal(body)
	if err != nil {
		return fmt.Errorf("failed to marshal request: %w", err)
	}

	reqURL := fmt.Sprintf("%s/api/messages/%s/clearlabel", c.baseURL, url.QueryEscape(messageID))
	httpReq, err := http.NewRequest("POST", reqURL, bytes.NewBuffer(jsonBody))
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := c.apiClient.Do(httpReq)
	if err != nil {
		return fmt.Errorf("failed to remove label: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("remove label failed (status %d): %s", resp.StatusCode, string(body))
	}

	return nil
}