package conversation

import (
	"database/sql"
	"database/sql/driver"
	"encoding/json"
	"fmt"
	"time"

	"git.mlow.ca/mlow/lmcli/pkg/api"
)

type Conversation struct {
	ID             uint `gorm:"primaryKey"`
	ShortName      sql.NullString
	Title          string
	SelectedRootID *uint
	SelectedRoot   *Message  `gorm:"foreignKey:SelectedRootID"`
	RootMessages   []Message `gorm:"-:all"`
	LastMessageAt  time.Time
}

type MessageMeta struct {
	GenerationProvider *string `json:"generation_provider,omitempty"`
	GenerationModel    *string `json:"generation_model,omitempty"`
}

type Message struct {
	ID        uint `gorm:"primaryKey"`
	CreatedAt time.Time
	Metadata  MessageMeta

	ConversationID  *uint         `gorm:"index"`
	Conversation    *Conversation `gorm:"foreignKey:ConversationID"`
	ParentID        *uint
	Parent          *Message  `gorm:"foreignKey:ParentID"`
	Replies         []Message `gorm:"foreignKey:ParentID"`
	SelectedReplyID *uint
	SelectedReply   *Message `gorm:"foreignKey:SelectedReplyID"`

	Role        api.MessageRole
	Content     string
	ToolCalls   ToolCalls   // a json array of tool calls (from the model)
	ToolResults ToolResults // a json array of tool results
}

func (m *MessageMeta) Scan(value interface{}) error {
	return json.Unmarshal(value.([]byte), m)
}

func (m MessageMeta) Value() (driver.Value, error) {
	return json.Marshal(m)
}

type ToolCalls []api.ToolCall

func (tc *ToolCalls) Scan(value any) (err error) {
	s := value.(string)
	if value == nil || s == "" {
		*tc = nil
		return
	}
	err = json.Unmarshal([]byte(s), tc)
	return
}

func (tc ToolCalls) Value() (driver.Value, error) {
	if len(tc) == 0 {
		return "", nil
	}
	jsonBytes, err := json.Marshal(tc)
	if err != nil {
		return "", fmt.Errorf("Could not marshal ToolCalls to JSON: %v\n", err)
	}
	return string(jsonBytes), nil
}

type ToolResults []api.ToolResult

func (tr *ToolResults) Scan(value any) (err error) {
	s := value.(string)
	if value == nil || s == "" {
		*tr = nil
		return
	}
	err = json.Unmarshal([]byte(s), tr)
	return
}

func (tr ToolResults) Value() (driver.Value, error) {
	if len(tr) == 0 {
		return "", nil
	}
	jsonBytes, err := json.Marshal([]api.ToolResult(tr))
	if err != nil {
		return "", fmt.Errorf("Could not marshal ToolResults to JSON: %v\n", err)
	}
	return string(jsonBytes), nil
}