package gemlog

import (
	"bytes"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"time"
)

func genBasicAuthHeader(user, password string) string {
	auth := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", user, password)))
	return fmt.Sprintf("Basic %s", auth)
}

func listGemLogs(config *Config) ([]GemlogListEntry, error) {
	url := fmt.Sprintf("%s:%d/gemlog/_design/gemlog-cli/_view/list", config.CouchDB.Host, config.CouchDB.Port)
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Add("authorization", genBasicAuthHeader(config.CouchDB.User, config.CouchDB.Password))

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer res.Body.Close()

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

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return nil, fmt.Errorf("unexpected status code %d: %s", res.StatusCode, string(body))
	}

	// Parse CouchDB response
	var couchResponse struct {
		TotalRows int `json:"total_rows"`
		Offset    int `json:"offset"`
		Rows      []struct {
			ID    string `json:"id"`
			Key   string `json:"key"`
			Value struct {
				Title string    `json:"title"`
				Slug  string    `json:"slug"`
				Date  time.Time `json:"date"`
				Rev   string    `json:"rev"`
				ID    string    `json:"id"`
			} `json:"value"`
		} `json:"rows"`
	}

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

	// Extract entries from response
	entries := make([]GemlogListEntry, 0, len(couchResponse.Rows))
	for _, row := range couchResponse.Rows {
		entry := GemlogListEntry{
			ID:    row.ID,
			Title: row.Value.Title,
			Slug:  row.Value.Slug,
			Date:  row.Value.Date,
			Rev:   row.Value.Rev,
		}
		entries = append(entries, entry)
	}

	slog.Info("Found gemlogs", "count", len(entries))
	return entries, nil
}

func ReadGemlogEntry(config *Config, id string) (GemlogEntry, error) {
	url := fmt.Sprintf("%s:%d/gemlog/%s", config.CouchDB.Host, config.CouchDB.Port, id)
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return GemlogEntry{}, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Add("authorization", genBasicAuthHeader(config.CouchDB.User, config.CouchDB.Password))
	req.Header.Add("content-type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return GemlogEntry{}, fmt.Errorf("failed to send request: %w", err)
	}
	defer res.Body.Close()

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

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return GemlogEntry{}, fmt.Errorf("unexpected status code %d: %s", res.StatusCode, string(body))
	}

	var rawData struct {
		Title   string    `json:"title"`
		GemText string    `json:"gemtxt"`
		Slug    string    `json:"slug"`
		Date    time.Time `json:"date"`
	}

	if err := json.Unmarshal(body, &rawData); err != nil {
		return GemlogEntry{}, fmt.Errorf("failed to parse response: %w", err)
	}

	return GemlogEntry{
		Title:  rawData.Title,
		Slug:   rawData.Slug,
		Date:   rawData.Date,
		Gemtxt: rawData.GemText,
		Tags:   make([]string, 0),
	}, nil
}

func DeleteGemlogEntry(config *Config, id string, rev string) error {
	url := fmt.Sprintf("%s:%d/gemlog/%s?rev=%s", config.CouchDB.Host, config.CouchDB.Port, id, rev)
	req, err := http.NewRequest("DELETE", url, nil)
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Add("authorization", genBasicAuthHeader(config.CouchDB.User, config.CouchDB.Password))
	req.Header.Add("content-type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return fmt.Errorf("failed to send request: %w", err)
	}
	defer res.Body.Close()

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

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return fmt.Errorf("unexpected status code %d: %s", res.StatusCode, string(body))
	}

	return nil
}

func SaveGemlogEntry(config *Config, entry *GemlogEntry) error {
	url := fmt.Sprintf("%s:%d/gemlog/", config.CouchDB.Host, config.CouchDB.Port)

	// Marshal the entry struct to JSON
	jsonData, err := json.Marshal(entry)
	if err != nil {
		return fmt.Errorf("failed to marshal entry: %w", err)
	}

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Add("authorization", genBasicAuthHeader(config.CouchDB.User, config.CouchDB.Password))
	req.Header.Add("content-type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return fmt.Errorf("failed to send request: %w", err)
	}
	defer res.Body.Close()

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

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return fmt.Errorf("unexpected status code %d: %s", res.StatusCode, string(body))
	}

	return nil
}

func CheckDBConnection(config *Config) error {
	url := fmt.Sprintf("%s:%d/gemlog/", config.CouchDB.Host, config.CouchDB.Port)
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}
	req.Header.Add("authorization", genBasicAuthHeader(config.CouchDB.User, config.CouchDB.Password))
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return fmt.Errorf("failed to send request: %w", err)
	}
	defer res.Body.Close()

	if res.StatusCode == 200 {
		return nil
	}
	return fmt.Errorf("unexpected status code %d", res.StatusCode)
}