package eia

import (
	"context"
	"net/url"
	"slices"
	"time"

	"github.com/deepmap/oapi-codegen/pkg/securityprovider"
	"github.com/rs/zerolog"

	eiaapi "gitea.libretechconsulting.com/50W/eia-api-go/api"
)

const (
	defaultBaseURL     = "https://api.eia.gov"
	defaultPingTimeout = 10 * time.Second
	defaultLogLevel    = zerolog.DebugLevel
)

// Simple wrapper around generated EIA API client
// that embeds a client with a bearer auth interceptor
// and optional logging middleware
//
// Performs a basic availability check against the API
// when creating a new client, and exposes a Ping() method
// for health / readiness probes
type Client struct {
	ctx                context.Context
	apiKey             string
	healthCheckTimeout time.Duration
	*eiaapi.Client
}

type ClientOpts struct {
	Context            context.Context // Base context for requests
	APIKey             string          // API Key [EIA Opendata API v2](https://www.eia.gov/opendata/index.php)
	Logger             *zerolog.Logger // Optional logger, if set is injected into logging middleware
	LogLevel           *zerolog.Level  // Optional log level, default is zerolog.DebugLevel
	BaseURL            *url.URL        // Optional, default is https://api.eia.gov
	HealthCheckTimeout *time.Duration  // Timeout for Ping() function, default is 10s
}

func NewClient(opts *ClientOpts) (*Client, error) {
	baseURL := defaultBaseURL
	if opts.BaseURL != nil {
		baseURL = opts.BaseURL.String()
	}

	hcTimeout := defaultPingTimeout
	if opts.HealthCheckTimeout != nil && *opts.HealthCheckTimeout > time.Duration(0) {
		hcTimeout = *opts.HealthCheckTimeout
	}

	middlewares := make([]eiaapi.ClientOption, 0, 2)

	// Injects Authorization: Bearer <APIKey> header into
	// outbound API calls
	basicAuth, err := securityprovider.NewSecurityProviderBearerToken(opts.APIKey)
	if err != nil {
		return nil, err
	}
	middlewares = append(middlewares, eiaapi.WithRequestEditorFn(basicAuth.Intercept))

	// Logging middleware, if logger is given
	if opts.Logger != nil {
		logLevel := defaultLogLevel
		if opts.LogLevel != nil {
			logLevel = *opts.LogLevel
		}

		middlewares = append(middlewares,
			eiaapi.WithRequestEditorFn(newLoggingMiddleware(opts.Logger, logLevel)))
	}

	client, err := eiaapi.NewClient(baseURL, slices.Clip(middlewares)...)
	if err != nil {
		return nil, err
	}

	return &Client{
		apiKey:             opts.APIKey,
		ctx:                opts.Context,
		healthCheckTimeout: hcTimeout,
		Client:             client,
	}, nil
}