package nanoleaf

import (
	"context"
	"encoding/json"
	"fmt"
	"git.aiterp.net/lucifer/new-server/models"
	"net/http"
	"sync"
	"time"
)

type Driver struct {
	mu      sync.Mutex
	bridges []*bridge
}

// SearchBridge checks the bridge at the address. If it's not a dry-run, you must hold down the power button
// before calling this function and wait for the pattern.
func (d *Driver) SearchBridge(ctx context.Context, address string, dryRun bool) ([]models.Bridge, error) {
	res, err := http.Get(fmt.Sprintf("http://%s/device_info", address))
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	deviceInfo := DeviceInfo{}
	err = json.NewDecoder(res.Body).Decode(&deviceInfo)
	if err != nil {
		return nil, err
	}
	if deviceInfo.ModelNumber == "" {
		return nil, models.ErrUnexpectedResponse
	}

	token := ""
	if !dryRun {
		req, err := http.NewRequest("POST", fmt.Sprintf("http://%s:16021/api/v1/new/", address), nil)
		if err != nil {
			return nil, err
		}

		res, err := http.DefaultClient.Do(req.WithContext(ctx))
		if err != nil {
			return nil, err
		}
		defer res.Body.Close()

		if res.StatusCode != 200 {
			return nil, models.ErrBridgeSearchFailed
		}

		tokenResponse := TokenResponse{}
		err = json.NewDecoder(res.Body).Decode(&tokenResponse)
		if err != nil {
			return nil, err
		}

		token = tokenResponse.Token
	}

	return []models.Bridge{{
		ID: -1,
		Name: fmt.Sprintf("Nanoleaf Controller (MN: %s, SN: %s, HV: %s, FV: %s, BV: %s)",
			deviceInfo.ModelNumber,
			deviceInfo.SerialNumber,
			deviceInfo.HardwareVersion,
			deviceInfo.FirmwareVersion,
			deviceInfo.BootloaderVersion,
		),
		Driver:  models.DTNanoLeaf,
		Address: address,
		Token:   token,
	}}, nil
}

func (d *Driver) SearchDevices(ctx context.Context, bridge models.Bridge, timeout time.Duration) ([]models.Device, error) {
	b, err := d.ensureBridge(ctx, bridge)
	if err != nil {
		return nil, err
	}

	if timeout > time.Millisecond {
		timeoutCtx, cancel := context.WithTimeout(ctx, timeout)
		defer cancel()

		ctx = timeoutCtx
	}

	err = b.Refresh(ctx)
	if err != nil {
		return nil, err
	}

	return b.Devices(), nil
}

func (d *Driver) ListDevices(ctx context.Context, bridge models.Bridge) ([]models.Device, error) {
	b, err := d.ensureBridge(ctx, bridge)
	if err != nil {
		return nil, err
	}

	return b.Devices(), nil
}

func (d *Driver) Run(ctx context.Context, bridge models.Bridge, ch chan<- models.Event) error {
	b, err := d.ensureBridge(ctx, bridge)
	if err != nil {
		return err
	}

	return b.Run(ctx, bridge, ch)
}

func (d *Driver) Publish(ctx context.Context, bridge models.Bridge, devices []models.Device) error {
	b, err := d.ensureBridge(ctx, bridge)
	if err != nil {
		return err
	}

	b.Update(devices)

	return nil
}

func (d *Driver) ensureBridge(ctx context.Context, info models.Bridge) (*bridge, error) {
	d.mu.Lock()
	for _, bridge := range d.bridges {
		if bridge.host == info.Address {
			d.mu.Unlock()
			return bridge, nil
		}
	}
	d.mu.Unlock()

	bridge := &bridge{
		host:       info.Address,
		apiKey:     info.Token,
		externalID: info.ID,
		panelIDMap: make(map[uint16]int, 9),
	}

	// If this fails, then the authorization failed.
	err := bridge.Refresh(ctx)
	if err != nil {
		return nil, err
	}

	// To avoid a potential duplicate, try looking for it again before inserting
	d.mu.Lock()
	for _, bridge := range d.bridges {
		if bridge.host == info.Address {
			d.mu.Unlock()
			return bridge, nil
		}
	}
	d.bridges = append(d.bridges, bridge)
	d.mu.Unlock()

	return bridge, nil
}