package middlewares

import (
	"time"

	"doormile/utils"

	"github.com/gofiber/fiber/v2"
)

func ZapLogger() fiber.Handler {
	return func(c *fiber.Ctx) error {
		start := time.Now()

		err := c.Next()

		latency := time.Since(start)
		status := c.Response().StatusCode()
		method := c.Method()
		path := c.Path()

		// Client identity and the request id travel with every log line.
		//
		// X-Client / X-Platform are what the customer app sends
		// ("doormile-cx/1.0.0+12", "android"), and they are the only way to
		// answer "is this failing on one build or everywhere" — which is the
		// first question asked when an app-side report arrives. The request id
		// is what correlates a customer saying "it failed" with the line that
		// recorded the real error behind the customer-safe message.
		//
		// Recorded as empty rather than omitted when absent, so a caller that
		// sends nothing is visibly a caller that sends nothing.
		fields := []interface{}{
			"method", method,
			"path", path,
			"status", status,
			"latency", latency,
			"client", c.Get("X-Client"),
			"platform", c.Get("X-Platform"),
		}
		if id, ok := c.Locals("requestid").(string); ok && id != "" {
			fields = append(fields, "requestid", id)
		}

		if err != nil {
			utils.Error("API request error", append(fields, "error", err.Error())...)
		} else {
			utils.Info("API request success", fields...)
		}

		return err
	}
}