package mysql

import (
	"context"
	"encoding/json"
	"git.aiterp.net/lucifer/new-server/models"
	sq "github.com/Masterminds/squirrel"
	"github.com/jmoiron/sqlx"
	"log"
	"strings"
)

type deviceRecord struct {
	ID           int    `db:"id"`
	BridgeID     int    `db:"bridge_id"`
	InternalID   string `db:"internal_id"`
	Icon         string `db:"icon"`
	Name         string `db:"name"`
	Capabilities string `db:"capabilities"`
	ButtonNames  string `db:"button_names"`
}

type deviceStateRecord struct {
	DeviceID   int     `db:"device_id"`
	Hue        float64 `db:"hue"`
	Saturation float64 `db:"saturation"`
	Kelvin     int     `db:"kelvin"`
	Power      bool    `db:"power"`
	Intensity  float64 `db:"intensity"`
}

type devicePropertyRecord struct {
	DeviceID int    `db:"device_id"`
	Key      string `db:"prop_key"`
	Value    string `db:"prop_value"`
	IsUser   bool   `db:"is_user"`
}

type deviceTagRecord struct {
	DeviceID int    `db:"device_id"`
	TagName  string `db:"tag_name"`
}

type DeviceRepo struct {
	DBX *sqlx.DB
}

func (r *DeviceRepo) Find(ctx context.Context, id int) (*models.Device, error) {
	var device deviceRecord
	err := r.DBX.GetContext(ctx, &device, "SELECT * FROM device WHERE id = ?", id)
	if err != nil {
		return nil, dbErr(err)
	}

	return r.populateOne(ctx, device)
}

func (r *DeviceRepo) FetchByReference(ctx context.Context, kind models.ReferenceKind, value string) ([]models.Device, error) {
	var err error
	records := make([]deviceRecord, 0, 8)

	switch kind {
	case models.RKDeviceID:
		err = r.DBX.SelectContext(ctx, &records, "SELECT * FROM device WHERE id=?", value)
	case models.RKBridgeID:
		err = r.DBX.SelectContext(ctx, &records, "SELECT * FROM device WHERE bridge_id=?", value)
	case models.RKTag:
		err = r.DBX.SelectContext(ctx, &records, "SELECT device.* FROM device JOIN device_tag dt ON device.id = dt.device_id WHERE dt.tag_name=?", value)
	case models.RKAll:
		err = r.DBX.SelectContext(ctx, &records, "SELECT device.* FROM device")
	default:
		log.Println("Unknown reference kind used for device fetch:", kind)
		return []models.Device{}, nil
	}
	if err != nil {
		return nil, dbErr(err)
	}

	return r.populate(ctx, records)
}

func (r *DeviceRepo) Save(ctx context.Context, device *models.Device) error {
	tx, err := r.DBX.Beginx()
	if err != nil {
		return dbErr(err)
	}
	defer tx.Rollback()

	record := deviceRecord{
		ID:           device.ID,
		BridgeID:     device.BridgeID,
		InternalID:   device.InternalID,
		Icon:         device.Icon,
		Name:         device.Name,
		Capabilities: strings.Join(models.DeviceCapabilitiesToStrings(device.Capabilities), ","),
		ButtonNames:  strings.Join(device.ButtonNames, ","),
	}

	if device.ID > 0 {
		_, err := tx.NamedExecContext(ctx, `
			UPDATE device SET
				internal_id = :internal_id,
				icon = :icon,
				name = :name,
				capabilities = :capabilities,
				button_names = :button_names
			WHERE id=:id
		`, record)
		if err != nil {
			return dbErr(err)
		}

		// Let's just be lazy for now, optimize later if need be.
		_, err = tx.ExecContext(ctx, "DELETE FROM device_tag WHERE device_id=?", record.ID)
		if err != nil {
			return dbErr(err)
		}
		_, err = tx.ExecContext(ctx, "DELETE FROM device_property WHERE device_id=?", record.ID)
		if err != nil {
			return dbErr(err)
		}
	} else {
		res, err := tx.NamedExecContext(ctx, `
			INSERT INTO device (bridge_id, internal_id, icon, name, capabilities, button_names)
			VALUES (:bridge_id, :internal_id, :icon, :name, :capabilities, :button_names)
		`, record)
		if err != nil {
			return dbErr(err)
		}

		lastID, err := res.LastInsertId()
		if err != nil {
			return dbErr(err)
		}

		record.ID = int(lastID)
		device.ID = int(lastID)
	}

	for _, tag := range device.Tags {
		_, err := tx.ExecContext(ctx, "INSERT INTO device_tag (device_id, tag_name) VALUES (?, ?)", record.ID, tag)
		if err != nil {
			return dbErr(err)
		}
	}

	for key, value := range device.UserProperties {
		_, err := tx.ExecContext(ctx, "INSERT INTO device_property (device_id, prop_key, prop_value, is_user) VALUES (?, ?, ?, 1)",
			record.ID, key, value,
		)
		if err != nil {
			return dbErr(err)
		}
	}

	for key, value := range device.DriverProperties {
		j, err := json.Marshal(value)
		if err != nil {
			// Eh, it'll get filled by the driver anyway
			continue
		}

		_, err = tx.ExecContext(ctx, "INSERT INTO device_property (device_id, prop_key, prop_value, is_user) VALUES (?, ?, ?, 0)",
			record.ID, key, string(j),
		)
		if err != nil {
			// Return err here anyway, it might put the tx in a bad state to ignore it.
			return dbErr(err)
		}
	}

	_, err = tx.NamedExecContext(ctx, `
			REPLACE INTO device_state(device_id, hue, saturation, kelvin, power, intensity) 
			VALUES (:device_id, :hue, :saturation, :kelvin, :power, :intensity)
	`, deviceStateRecord{
		DeviceID:   record.ID,
		Hue:        device.State.Color.Hue,
		Saturation: device.State.Color.Saturation,
		Kelvin:     device.State.Color.Kelvin,
		Power:      device.State.Power,
		Intensity:  device.State.Intensity,
	})
	if err != nil {
		return dbErr(err)
	}

	return tx.Commit()
}

func (r *DeviceRepo) Delete(ctx context.Context, device *models.Device) error {
	_, err := r.DBX.ExecContext(ctx, "DELETE FROM device WHERE Id=?", device.ID)
	if err != nil {
		return dbErr(err)
	}

	return nil
}

func (r *DeviceRepo) populateOne(ctx context.Context, record deviceRecord) (*models.Device, error) {
	records, err := r.populate(ctx, []deviceRecord{record})
	if err != nil {
		return nil, err
	}

	return &records[0], nil
}

func (r *DeviceRepo) populate(ctx context.Context, records []deviceRecord) ([]models.Device, error) {
	if len(records) == 0 {
		return []models.Device{}, nil
	}

	ids := make([]int, 0, len(records))
	for _, record := range records {
		ids = append(ids, record.ID)
	}

	tagsQuery, tagsArgs, err := sq.Select("*").From("device_tag").Where(sq.Eq{"device_id": ids}).ToSql()
	if err != nil {
		return nil, dbErr(err)
	}
	propsQuery, propsArgs, err := sq.Select("*").From("device_property").Where(sq.Eq{"device_id": ids}).ToSql()
	if err != nil {
		return nil, dbErr(err)
	}
	stateQuery, stateArgs, err := sq.Select("*").From("device_state").Where(sq.Eq{"device_id": ids}).ToSql()
	if err != nil {
		return nil, dbErr(err)
	}

	states := make([]deviceStateRecord, 0, len(records))
	props := make([]devicePropertyRecord, 0, len(records)*8)
	tags := make([]deviceTagRecord, 0, len(records)*4)

	err = r.DBX.SelectContext(ctx, &states, stateQuery, stateArgs...)
	if err != nil {
		return nil, dbErr(err)
	}
	err = r.DBX.SelectContext(ctx, &props, propsQuery, propsArgs...)
	if err != nil {
		return nil, dbErr(err)
	}
	err = r.DBX.SelectContext(ctx, &tags, tagsQuery, tagsArgs...)
	if err != nil {
		return nil, dbErr(err)
	}

	devices := make([]models.Device, 0, len(records))
	for _, record := range records {
		device := models.Device{
			ID:               record.ID,
			BridgeID:         record.BridgeID,
			InternalID:       record.InternalID,
			Icon:             record.Icon,
			Name:             record.Name,
			ButtonNames:      strings.Split(record.ButtonNames, ","),
			DriverProperties: make(map[string]interface{}, 8),
			UserProperties:   make(map[string]string, 8),
			Tags:             make([]string, 0, 8),
		}

		caps := make([]models.DeviceCapability, 0, 16)
		for _, capStr := range strings.Split(record.Capabilities, ",") {
			caps = append(caps, models.DeviceCapability(capStr))
		}
		device.Capabilities = caps

		for _, state := range states {
			if state.DeviceID == record.ID {
				device.State = models.DeviceState{
					Power: state.Power,
					Color: models.ColorValue{
						Hue:        state.Hue,
						Saturation: state.Saturation,
						Kelvin:     state.Kelvin,
					},
					Intensity: state.Intensity,
				}
			}
		}

		driverProps := make(map[string]json.RawMessage, 8)
		for _, prop := range props {
			if prop.DeviceID == record.ID {
				if prop.IsUser {
					device.UserProperties[prop.Key] = prop.Value
				} else {
					driverProps[prop.Key] = json.RawMessage(prop.Value)
				}
			}
		}
		if len(driverProps) > 0 {
			j, err := json.Marshal(driverProps)
			if err != nil {
				return nil, dbErr(err)
			}
			err = json.Unmarshal(j, &device.DriverProperties)
			if err != nil {
				return nil, dbErr(err)
			}
		}

		for _, tag := range tags {
			if tag.DeviceID == record.ID {
				device.Tags = append(device.Tags, tag.TagName)
			}
		}

		devices = append(devices, device)
	}

	return devices, nil
}