package handlers

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"net/http"
	"time"
)

// SocialMediaAccount representerar ett kopplat socialt media-konto
type SocialMediaAccount struct {
	ID           string    `json:"id"`
	Platform     string    `json:"platform"`
	AccountName  string    `json:"account_name"`
	DisplayName  string    `json:"display_name"`
	Followers    int       `json:"followers"`
	Following    int       `json:"following"`
	Posts        int       `json:"posts"`
	ProfileURL   string    `json:"profile_url"`
	AvatarURL    string    `json:"avatar_url"`
	IsConnected  bool      `json:"is_connected"`
	LastSynced   time.Time `json:"last_synced"`
	CreatedAt    time.Time `json:"created_at"`
}

// SocialMediaPost representerar ett inlägg
type SocialMediaPost struct {
	ID          string    `json:"id"`
	AccountID   string    `json:"account_id"`
	Platform    string    `json:"platform"`
	Content     string    `json:"content"`
	MediaURL    string    `json:"media_url,omitempty"`
	Likes       int       `json:"likes"`
	Comments    int       `json:"comments"`
	Shares      int       `json:"shares"`
	Reach       int       `json:"reach"`
	PostedAt    time.Time `json:"posted_at"`
	Status      string    `json:"status"`
}

// SocialMediaStats representerar aggregerad statistik
type SocialMediaStats struct {
	TotalFollowers int `json:"total_followers"`
	TotalPosts     int `json:"total_posts"`
	TotalEngagement int `json:"total_engagement"`
	Accounts       int `json:"accounts"`
}

// SocialMediaHandler hanterar sociala media-konton
type SocialMediaHandler struct {
	db *sql.DB
}

// NewSocialMediaHandler skapar en ny handler
func NewSocialMediaHandler(db *sql.DB) *SocialMediaHandler {
	return &SocialMediaHandler{db: db}
}

// InitDB skapar tabeller för sociala media
func (h *SocialMediaHandler) InitDB() error {
	_, err := h.db.Exec(`
		CREATE TABLE IF NOT EXISTS social_media_accounts (
			id TEXT PRIMARY KEY,
			platform TEXT NOT NULL,
			account_name TEXT NOT NULL,
			display_name TEXT,
			followers INTEGER DEFAULT 0,
			following INTEGER DEFAULT 0,
			posts INTEGER DEFAULT 0,
			profile_url TEXT,
			avatar_url TEXT,
			is_connected BOOLEAN DEFAULT false,
			last_synced TIMESTAMP,
			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
		)
	`)
	if err != nil {
		return err
	}

	_, err = h.db.Exec(`
		CREATE TABLE IF NOT EXISTS social_media_posts (
			id TEXT PRIMARY KEY,
			account_id TEXT NOT NULL,
			platform TEXT NOT NULL,
			content TEXT,
			media_url TEXT,
			likes INTEGER DEFAULT 0,
			comments INTEGER DEFAULT 0,
			shares INTEGER DEFAULT 0,
			reach INTEGER DEFAULT 0,
			posted_at TIMESTAMP,
			status TEXT DEFAULT 'published',
			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
			FOREIGN KEY (account_id) REFERENCES social_media_accounts(id)
		)
	`)
	return err
}

// ListAccounts listar alla kopplade konton
func (h *SocialMediaHandler) ListAccounts(w http.ResponseWriter, r *http.Request) {
	rows, err := h.db.Query(`
		SELECT id, platform, account_name, display_name, followers, following, posts,
			profile_url, avatar_url, is_connected, last_synced, created_at
		FROM social_media_accounts
		ORDER BY platform, account_name
	`)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}
	defer rows.Close()

	var accounts []SocialMediaAccount
	for rows.Next() {
		var a SocialMediaAccount
		var lastSynced sql.NullTime
		err := rows.Scan(
			&a.ID, &a.Platform, &a.AccountName, &a.DisplayName,
			&a.Followers, &a.Following, &a.Posts,
			&a.ProfileURL, &a.AvatarURL, &a.IsConnected,
			&lastSynced, &a.CreatedAt,
		)
		if err != nil {
			continue
		}
		if lastSynced.Valid {
			a.LastSynced = lastSynced.Time
		}
		accounts = append(accounts, a)
	}

	if accounts == nil {
		accounts = []SocialMediaAccount{}
	}
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":       true,
		"accounts": accounts,
	})
}

// GetStats returnerar aggregerad statistik
func (h *SocialMediaHandler) GetStats(w http.ResponseWriter, r *http.Request) {
	var stats SocialMediaStats
	err := h.db.QueryRow(`
		SELECT 
			COALESCE(SUM(followers), 0),
			COALESCE(SUM(posts), 0),
			COUNT(*)
		FROM social_media_accounts
		WHERE is_connected = true
	`).Scan(&stats.TotalFollowers, &stats.TotalPosts, &stats.Accounts)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":    true,
		"stats": stats,
	})
}

// AddAccount lägger till ett nytt konto
func (h *SocialMediaHandler) AddAccount(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Platform    string `json:"platform"`
		AccountName string `json:"account_name"`
		DisplayName string `json:"display_name"`
		ProfileURL  string `json:"profile_url"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]interface{}{
			"ok":    false,
			"error": "invalid request",
		})
		return
	}

	id := fmt.Sprintf("%s_%d", req.Platform, time.Now().Unix())
	_, err := h.db.Exec(`
		INSERT INTO social_media_accounts (id, platform, account_name, display_name, profile_url, is_connected)
		VALUES (?, ?, ?, ?, ?, true)
	`, id, req.Platform, req.AccountName, req.DisplayName, req.ProfileURL)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":      true,
		"account": map[string]interface{}{
			"id":       id,
			"platform": req.Platform,
			"name":     req.AccountName,
		},
	})
}

// ListPosts listar inlägg
func (h *SocialMediaHandler) ListPosts(w http.ResponseWriter, r *http.Request) {
	accountID := r.URL.Query().Get("account_id")
	platform := r.URL.Query().Get("platform")

	query := `
		SELECT id, account_id, platform, content, media_url, likes, comments, shares, reach, posted_at, status
		FROM social_media_posts
		WHERE 1=1
	`
	var args []interface{}

	if accountID != "" {
		query += " AND account_id = ?"
		args = append(args, accountID)
	}
	if platform != "" {
		query += " AND platform = ?"
		args = append(args, platform)
	}
	query += " ORDER BY posted_at DESC LIMIT 50"

	rows, err := h.db.Query(query, args...)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}
	defer rows.Close()

	var posts []SocialMediaPost
	for rows.Next() {
		var p SocialMediaPost
		var postedAt sql.NullTime
		err := rows.Scan(
			&p.ID, &p.AccountID, &p.Platform, &p.Content, &p.MediaURL,
			&p.Likes, &p.Comments, &p.Shares, &p.Reach, &postedAt, &p.Status,
		)
		if err != nil {
			continue
		}
		if postedAt.Valid {
			p.PostedAt = postedAt.Time
		}
		posts = append(posts, p)
	}

	if posts == nil {
		posts = []SocialMediaPost{}
	}
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":    true,
		"posts": posts,
	})
}