package main

import (
	"fmt"
	"io"
	"net/http"
	"os"

	"github.com/influxdata/influx-cli/v2/api"
	"github.com/influxdata/influx-cli/v2/clients/write"
	"github.com/influxdata/influx-cli/v2/pkg/cli/middleware"
	"github.com/urfave/cli"
)

type writeParams struct {
	Files       cli.StringSlice
	URLs        cli.StringSlice
	Format      write.InputFormat
	Compression write.InputCompression
	Encoding    string

	// CSV-specific options.
	Headers                    cli.StringSlice
	SkipRowOnError             bool
	SkipHeader                 int
	IgnoreDataTypeInColumnName bool
	Debug                      bool

	ErrorsFile    string
	MaxLineLength int
	RateLimit     write.BytesPerSec

	write.Params
}

func (p *writeParams) makeLineReader(args []string, errorOut io.Writer) *write.MultiInputLineReader {
	return &write.MultiInputLineReader{
		StdIn:                      os.Stdin,
		HttpClient:                 http.DefaultClient,
		ErrorOut:                   errorOut,
		Args:                       args,
		Files:                      p.Files.Value(),
		URLs:                       p.URLs.Value(),
		Format:                     p.Format,
		Compression:                p.Compression,
		Encoding:                   p.Encoding,
		Headers:                    p.Headers.Value(),
		SkipRowOnError:             p.SkipRowOnError,
		SkipHeader:                 p.SkipHeader,
		IgnoreDataTypeInColumnName: p.IgnoreDataTypeInColumnName,
		Debug:                      p.Debug,
	}
}

func (p *writeParams) makeErrorFile() (*os.File, error) {
	if p.ErrorsFile == "" {
		return nil, nil
	}

	_, err := os.Stat(p.ErrorsFile)
	if os.IsNotExist(err) {
		file, err := os.Create(p.ErrorsFile)
		if err != nil {
			return nil, fmt.Errorf("failed to create errors-file: %w", err)
		}
		return file, nil
	}

	errorFile, err := os.Open(p.ErrorsFile)
	if err != nil {
		return nil, fmt.Errorf("failed to open errors-file: %w", err)
	}
	return errorFile, nil
}

func (p *writeParams) Flags() []cli.Flag {
	return append(getOrgFlags(&p.OrgParams), []cli.Flag{
		&cli.StringFlag{
			Name:        "bucket-id",
			Usage:       "The ID of destination bucket",
			EnvVar:      "INFLUX_BUCKET_ID",
			Destination: &p.BucketID,
		},
		&cli.StringFlag{
			Name:        "bucket, b",
			Usage:       "The name of destination bucket",
			EnvVar:      "INFLUX_BUCKET_NAME",
			Destination: &p.BucketName,
		},
		&cli.GenericFlag{
			Name:   "precision, p",
			Usage:  "Precision of the timestamps of the lines",
			EnvVar: "INFLUX_PRECISION",
			Value:  &p.Precision,
		},
		&cli.GenericFlag{
			Name:  "format",
			Usage: "Input format, either 'lp' (Line Protocol) or 'csv' (Comma Separated Values)",
			Value: &p.Format,
		},
		&cli.StringSliceFlag{
			Name:  "header",
			Usage: "Header prepends lines to input data",
			Value: &p.Headers,
		},
		&cli.StringSliceFlag{
			Name:      "file, f",
			Usage:     "The path to the file to import",
			TakesFile: true,
			Value:     &p.Files,
		},
		&cli.StringSliceFlag{
			Name:  "url, u",
			Usage: "The URL to import data from",
			Value: &p.URLs,
		},
		&cli.BoolFlag{
			Name:        "debug",
			Usage:       "Log CSV columns to stderr before reading data rows",
			Destination: &p.Debug,
		},
		&cli.BoolFlag{
			Name:        "skipRowOnError",
			Usage:       "Log CSV data errors to stderr and continue with CSV processing",
			Destination: &p.SkipRowOnError,
		},
		// NOTE: The old CLI allowed this flag to be used as an int _or_ a bool, with the bool form being
		// short-hand for N=1. urfave/cli isn't that flexible.
		&cli.IntFlag{
			Name:        "skipHeader",
			Usage:       "Skip the first <n> rows from input data",
			Destination: &p.SkipHeader,
		},
		&cli.IntFlag{
			Name:        "max-line-length",
			Usage:       "Specifies the maximum number of bytes that can be read for a single line",
			Value:       16_000_000,
			Destination: &p.MaxLineLength,
		},
		&cli.BoolFlag{
			Name:        "xIgnoreDataTypeInColumnName",
			Usage:       "Ignores dataType which could be specified after ':' in column name",
			Hidden:      true,
			Destination: &p.IgnoreDataTypeInColumnName,
		},
		&cli.StringFlag{
			Name:        "encoding",
			Usage:       "Character encoding of input files or stdin",
			Value:       "UTF-8",
			Destination: &p.Encoding,
		},
		&cli.StringFlag{
			Name:        "errors-file",
			Usage:       "The path to the file to write rejected rows to",
			TakesFile:   true,
			Destination: &p.ErrorsFile,
		},
		&cli.GenericFlag{
			Name:  "rate-limit",
			Usage: `Throttles write, examples: "5 MB / 5 min" , "17kBs"`,
			Value: &p.RateLimit,
		},
		&cli.GenericFlag{
			Name:  "compression",
			Usage: "Input compression, either 'none' or 'gzip'",
			Value: &p.Compression,
		},
	}...)
}

func newWriteCmd() cli.Command {
	params := writeParams{
		Params: write.Params{
			Precision: api.WRITEPRECISION_NS,
		},
	}
	return cli.Command{
		Name:        "write",
		Usage:       "Write points to InfluxDB",
		Description: "Write data to InfluxDB via stdin, or add an entire file specified with the -f flag",
		Before:      middleware.WithBeforeFns(withCli(), withApi(true)),
		Flags:       append(commonFlagsNoPrint(), params.Flags()...),
		Action: func(ctx *cli.Context) error {
			if err := checkOrgFlags(&params.OrgParams); err != nil {
				return err
			}
			errorFile, err := params.makeErrorFile()
			if err != nil {
				return err
			}
			defer func() { _ = errorFile.Close() }()

			client := &write.Client{
				CLI:         getCLI(ctx),
				WriteApi:    getAPI(ctx).WriteApi,
				LineReader:  params.makeLineReader(ctx.Args(), errorFile),
				RateLimiter: write.NewThrottler(params.RateLimit),
				BatchWriter: &write.BufferBatcher{
					MaxFlushBytes:    write.DefaultMaxBytes,
					MaxFlushInterval: write.DefaultInterval,
					MaxLineLength:    params.MaxLineLength,
				},
			}

			return client.Write(getContext(ctx), &params.Params)
		},
		Subcommands: []cli.Command{
			newWriteDryRun(),
		},
	}
}

func newWriteDryRun() cli.Command {
	params := writeParams{
		Params: write.Params{
			Precision: api.WRITEPRECISION_NS,
		},
	}

	return cli.Command{
		Name:        "dryrun",
		Usage:       "Write to stdout instead of InfluxDB",
		Description: "Write protocol lines to stdout instead of InfluxDB. Troubleshoot conversion from CSV to line protocol",
		Before:      middleware.WithBeforeFns(withCli(), withApi(true)),
		Flags:       append(commonFlagsNoPrint(), params.Flags()...),
		Action: func(ctx *cli.Context) error {
			if err := checkOrgFlags(&params.OrgParams); err != nil {
				return err
			}
			errorFile, err := params.makeErrorFile()
			fmt.Println(params.OrgBucketParams.OrgName)
			if err != nil {
				return err
			}
			defer func() { _ = errorFile.Close() }()

			client := write.DryRunClient{
				CLI:        getCLI(ctx),
				LineReader: params.makeLineReader(ctx.Args(), errorFile),
			}
			return client.WriteDryRun(getContext(ctx))
		},
	}
}