// Package mock provides a fake garmin.Client for tests and frontend/dev
// work without a live Garmin account or the wrapper subprocess.
package mock

import (
	"context"

	"geniusrun/backend/internal/garmin"
)

// Client is a fake garmin.Client returning data supplied by the test/caller.
type Client struct {
	AuthResults        []garmin.AuthResult // consumed in order by Authenticate/CompleteMFA calls
	Activities         []garmin.Activity
	Splits             map[int64]garmin.ActivitySplits
	Details            map[int64]garmin.ActivityDetails
	Workouts           map[int64]garmin.Workout
	Err                error // if set, every call returns this error
	authResultCursor   int
	ClosedCalled       bool
	GetActivitiesCalls int
	AuthenticateCalls  int
	LastEmail          string
	LastPassword       string
}

var _ garmin.Client = (*Client)(nil)

func (c *Client) nextAuthResult() garmin.AuthResult {
	if c.authResultCursor >= len(c.AuthResults) {
		return garmin.AuthResult{Status: garmin.AuthSuccess, Message: "Authenticated successfully."}
	}
	r := c.AuthResults[c.authResultCursor]
	c.authResultCursor++
	return r
}

func (c *Client) Authenticate(ctx context.Context) (garmin.AuthResult, error) {
	c.AuthenticateCalls++
	if c.Err != nil {
		return garmin.AuthResult{}, c.Err
	}
	return c.nextAuthResult(), nil
}

func (c *Client) CompleteMFA(ctx context.Context, code string) (garmin.AuthResult, error) {
	if c.Err != nil {
		return garmin.AuthResult{}, c.Err
	}
	return c.nextAuthResult(), nil
}

func (c *Client) GetActivities(ctx context.Context, startDate, endDate string, limit int) ([]garmin.Activity, error) {
	c.GetActivitiesCalls++
	if c.Err != nil {
		return nil, c.Err
	}
	if limit > 0 && limit < len(c.Activities) {
		return c.Activities[:limit], nil
	}
	return c.Activities, nil
}

func (c *Client) GetActivitySplits(ctx context.Context, activityID int64) (garmin.ActivitySplits, error) {
	if c.Err != nil {
		return garmin.ActivitySplits{}, c.Err
	}
	return c.Splits[activityID], nil
}

func (c *Client) GetActivityDetails(ctx context.Context, activityID int64) (garmin.ActivityDetails, error) {
	if c.Err != nil {
		return garmin.ActivityDetails{}, c.Err
	}
	return c.Details[activityID], nil
}

func (c *Client) GetWorkoutByID(ctx context.Context, workoutID int64) (garmin.Workout, error) {
	if c.Err != nil {
		return garmin.Workout{}, c.Err
	}
	return c.Workouts[workoutID], nil
}

func (c *Client) UpdateCredentials(email, password string) {
	c.LastEmail = email
	c.LastPassword = password
}

func (c *Client) Close() error {
	c.ClosedCalled = true
	return nil
}