package models

import (
	"fmt"
	"log"

	"odoo-go/pkg/orm"
	"odoo-go/pkg/tools"
)

// initMailThread extends existing models with mail.thread functionality.
// In Python Odoo, models inherit from mail.thread to get chatter support.
// Here we use ExtendModel to add the message fields and methods.
// Mirrors: odoo/addons/mail/models/mail_thread.py
func initMailThread() {
	// Models that support mail.thread chatter
	threadModels := []string{
		"res.partner",
		"sale.order",
		"purchase.order",
		"account.move",
		"stock.picking",
		"crm.lead",
		"project.task",
	}

	for _, modelName := range threadModels {
		// Check if the model is registered (module may not be loaded)
		if orm.Registry.Get(modelName) == nil {
			continue
		}

		m := orm.ExtendModel(modelName)

		m.AddFields(
			orm.Integer("message_partner_ids_count", orm.FieldOpts{
				String: "Followers Count",
				Help:   "Number of partners following this document.",
			}),
		)

		// message_post: post a new message on the record's chatter.
		// Mirrors: odoo/addons/mail/models/mail_thread.py message_post()
		m.RegisterMethod("message_post", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
			env := rs.Env()
			ids := rs.IDs()
			if len(ids) == 0 {
				return false, nil
			}

			// Parse kwargs from args
			body := ""
			messageType := "comment"
			subject := ""
			var attachmentIDs []int64
			if len(args) > 0 {
				if kw, ok := args[0].(map[string]interface{}); ok {
					if v, ok := kw["body"].(string); ok {
						body = v
					}
					if v, ok := kw["message_type"].(string); ok {
						messageType = v
					}
					if v, ok := kw["subject"].(string); ok {
						subject = v
					}
					if v, ok := kw["attachment_ids"].([]interface{}); ok {
						for _, aid := range v {
							switch id := aid.(type) {
							case float64:
								attachmentIDs = append(attachmentIDs, int64(id))
							case int64:
								attachmentIDs = append(attachmentIDs, id)
							}
						}
					}
				}
			}

			// Get author from current user's partner_id
			var authorID int64
			if err := env.Tx().QueryRow(env.Ctx(),
				`SELECT partner_id FROM res_users WHERE id = $1`, env.UID(),
			).Scan(&authorID); err != nil {
				log.Printf("warning: mail_thread message_post author lookup failed: %v", err)
			}

			// Create mail.message
			var msgID int64
			err := env.Tx().QueryRow(env.Ctx(),
				`INSERT INTO mail_message (model, res_id, body, message_type, author_id, subject, date, create_uid, write_uid, create_date, write_date)
				 VALUES ($1, $2, $3, $4, $5, $6, NOW(), $7, $7, NOW(), NOW())
				 RETURNING id`,
				rs.ModelDef().Name(), ids[0], body, messageType, authorID, subject, env.UID(),
			).Scan(&msgID)
			if err != nil {
				return nil, err
			}

			// Link attachments to the message via M2M
			for _, aid := range attachmentIDs {
				env.Tx().Exec(env.Ctx(),
					`INSERT INTO mail_message_ir_attachment_rel (mail_message_id, ir_attachment_id)
					 VALUES ($1, $2) ON CONFLICT DO NOTHING`, msgID, aid)
			}

			// Notify followers via email
			notifyFollowers(env, rs.ModelDef().Name(), ids[0], authorID, subject, body)

			return msgID, nil
		})

		// _message_get_thread: get messages for the record's chatter.
		// Mirrors: odoo/addons/mail/models/mail_thread.py _notify_thread()
		m.RegisterMethod("_message_get_thread", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
			env := rs.Env()
			ids := rs.IDs()
			if len(ids) == 0 {
				return []interface{}{}, nil
			}

			rows, err := env.Tx().Query(env.Ctx(),
				`SELECT m.id, m.body, m.message_type, m.date,
				        m.author_id, COALESCE(p.name, ''),
				        COALESCE(m.subject, ''), COALESCE(m.email_from, '')
				 FROM mail_message m
				 LEFT JOIN res_partner p ON p.id = m.author_id
				 WHERE m.model = $1 AND m.res_id = $2
				 ORDER BY m.id DESC`,
				rs.ModelDef().Name(), ids[0],
			)
			if err != nil {
				return nil, err
			}
			defer rows.Close()

			var messages []map[string]interface{}
			for rows.Next() {
				var id int64
				var body, msgType, subject, emailFrom string
				var date interface{}
				var authorID int64
				var authorName string

				if err := rows.Scan(&id, &body, &msgType, &date, &authorID, &authorName, &subject, &emailFrom); err != nil {
					continue
				}
				msg := map[string]interface{}{
					"id":           id,
					"body":         body,
					"message_type": msgType,
					"date":         date,
					"subject":      subject,
					"email_from":   emailFrom,
				}
				if authorID > 0 {
					msg["author_id"] = []interface{}{authorID, authorName}
				} else {
					msg["author_id"] = false
				}
				messages = append(messages, msg)
			}
			if messages == nil {
				messages = []map[string]interface{}{}
			}
			return messages, nil
		})
	}
}

// notifyFollowers sends email notifications to followers of a document.
// Skips the message author to avoid self-notifications.
// Mirrors: odoo/addons/mail/models/mail_thread.py _notify_thread()
func notifyFollowers(env *orm.Environment, modelName string, resID, authorID int64, subject, body string) {
	rows, err := env.Tx().Query(env.Ctx(),
		`SELECT DISTINCT p.email, p.name
		 FROM mail_followers f
		 JOIN res_partner p ON p.id = f.partner_id
		 WHERE f.res_model = $1 AND f.res_id = $2
		   AND f.partner_id != $3
		   AND p.email IS NOT NULL AND p.email != ''`,
		modelName, resID, authorID)
	if err != nil {
		log.Printf("mail: follower lookup failed for %s/%d: %v", modelName, resID, err)
		return
	}
	defer rows.Close()

	cfg := tools.LoadSMTPConfig()
	if cfg.Host == "" {
		return // SMTP not configured — skip silently
	}

	emailSubject := subject
	if emailSubject == "" {
		emailSubject = fmt.Sprintf("New message on %s", modelName)
	}

	for rows.Next() {
		var email, name string
		if err := rows.Scan(&email, &name); err != nil {
			continue
		}
		if err := tools.SendEmail(cfg, email, emailSubject, body); err != nil {
			log.Printf("mail: failed to notify %s (%s): %v", name, email, err)
		}
	}
}