//go:build linux || freebsd
// +build linux freebsd

package main

import (
	"fmt"
	stdhttp "net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"

	"codeberg.org/petrbalvin/goget/internal/auth"
	"codeberg.org/petrbalvin/goget/internal/cli"
	"codeberg.org/petrbalvin/goget/internal/config"
	"codeberg.org/petrbalvin/goget/internal/cookie"
	"codeberg.org/petrbalvin/goget/internal/core"
	"codeberg.org/petrbalvin/goget/internal/protocol/http"
	"codeberg.org/petrbalvin/goget/internal/transport"
)

// ApplyFlags populates the Config from CLI flags, global config, and cookie jar.
// It is the single function that maps all CLI flags to config fields — adding a
// new flag only requires adding one block here instead of hunting through
// scattered setup code.
func ApplyFlags(c *http.Config, f *Flags, cfg *config.Config, cookieJar *cookie.Jar, parsedURL *url.URL) {
	// ── Transport defaults from global config ──
	c.Transport.Timeout = cfg.GetEffectiveTimeout(-1, *f.Timeout)
	c.Transport.Dialer.IPv4Fallback = cfg.IPv4Fallback
	c.Transport.Dialer.Debug = cfg.Debug
	c.UserAgent = cfg.UserAgent
	c.Output.Verbose = cfg.Verbose
	c.Parallel = &core.ParallelConfig{
		Connections:  cfg.GetParallelConnections(-1),
		MinSize:      100 * 1024 * 1024,
		MinChunkSize: 5 * 1024 * 1024,
		MaxChunkSize: 50 * 1024 * 1024,
	}
	if cfg.MaxSpeed > 0 {
		c.RateLimiter = transport.NewTokenBucket(cfg.MaxSpeed, cfg.MaxSpeed/10)
	}

	// ── DNS / interface ──
	if len(cfg.DNSServers) > 0 {
		c.Transport.DNSServers = cfg.DNSServers
	}
	if *f.BindInterface != "" {
		c.Transport.BindInterface = *f.BindInterface
	}
	c.Transport.BlockPrivateIPs = !*f.AllowPrivate

	// ── Authentication ──
	if cfg.Auth.Username == "" && cfg.Auth.OAuth.AccessToken == "" {
		if user, pass, ok := auth.LookupNetrc(parsedURL.Hostname()); ok {
			cfg.Auth.Username = user
			cfg.Auth.Password = pass
		}
	}
	if cfg.Auth.Username != "" || cfg.Auth.OAuth.AccessToken != "" {
		c.Auth.Username = cfg.Auth.Username
		c.Auth.Password = cfg.Auth.Password
		c.Auth.AuthType = cfg.Auth.AuthType
		c.Auth.OAuth = &cfg.Auth.OAuth
	}
	if cookieJar != nil {
		c.CookieJar = cookieJar
	}

	// ── TLS and certificates ──
	if *f.Insecure && c.Transport.TLS != nil {
		c.Transport.TLS.InsecureSkipVerify = true
	}
	if *f.CertFile != "" && c.Transport.TLS != nil {
		c.Transport.TLS.CertFile = *f.CertFile
	}
	if *f.KeyFile != "" && c.Transport.TLS != nil {
		c.Transport.TLS.KeyFile = *f.KeyFile
	}
	if *f.PinnedCert != "" && c.Transport.TLS != nil {
		c.Transport.TLS.PinnedCertHash = *f.PinnedCert
	}
	if *f.CACertificate != "" && c.Transport.TLS != nil {
		c.Transport.TLS.CACertFile = *f.CACertificate
	}
	if *f.SSLKeyLogFile != "" && c.Transport.TLS != nil {
		c.Transport.TLS.KeyLogFile = *f.SSLKeyLogFile
	}
	if *f.ConnectTimeout > 0 && c.Transport.Dialer != nil {
		c.Transport.Dialer.Timeout = *f.ConnectTimeout
	}

	// ── Retry and redirects ──
	if *f.NoRedirect {
		c.Transport.FollowRedirects = false
	}
	if *f.MaxRetries > 0 {
		c.Transport.MaxRetries = *f.MaxRetries
		if c.Transport.Retry != nil {
			c.Transport.Retry.MaxRetries = *f.MaxRetries
		}
	}
	if *f.RetryDelay > 0 {
		c.Transport.RetryDelay = *f.RetryDelay
	}
	if *f.RetryHTTPError != "" {
		for _, code := range strings.Split(*f.RetryHTTPError, ",") {
			if code, err := strconv.Atoi(strings.TrimSpace(code)); err == nil {
				c.Transport.RetryHTTPCodes = append(c.Transport.RetryHTTPCodes, code)
			}
		}
	}
	if *f.RetryAllErrors {
		c.Transport.RetryAllErrors = true
	}

	// ── Timeouts and limits ──
	if *f.ConnectTimeout > 0 {
		c.Transport.ConnectTimeout = *f.ConnectTimeout
	}
	if *f.MaxTime > 0 {
		c.Transport.MaxTime = *f.MaxTime
	}
	if *f.MaxFileSize != "" {
		size, perr := parseRateLimit(*f.MaxFileSize)
		if perr != nil {
			cli.PrintWarning(os.Stderr, fmt.Sprintf("ignoring --max-filesize: %v; size limit disabled", perr))
		}
		c.Transport.MaxFileSize = size
	}

	// ── Output flags ──
	if *f.ContentDisp {
		c.Output.ContentDisposition = true
	}
	if *f.ShowHeaders {
		c.Output.ShowHeaders = true
	}
	if *f.KeepTimestamps {
		c.Output.KeepTimestamps = true
	}
	if *f.JSON {
		c.Output.JSONOutput = true
	}
	if *f.OnComplete != "" {
		c.Output.OnComplete = *f.OnComplete
	}
	if *f.WarcFile != "" {
		c.Output.WarcFile = *f.WarcFile
	}
	if *f.TraceTime {
		c.Output.TraceTime = true
	}
	if *f.WriteOut != "" {
		c.Output.WriteOut = *f.WriteOut
	}

	// ── Request flags ──
	if len(f.Headers) > 0 {
		if c.CustomHeaders == nil {
			c.CustomHeaders = make(map[string]string)
		}
		for _, h := range f.Headers {
			parts := strings.SplitN(h, ":", 2)
			key := strings.TrimSpace(parts[0])
			val := ""
			if len(parts) > 1 {
				val = strings.TrimSpace(parts[1])
			}
			if strings.ContainsAny(key, "\r\n") || strings.ContainsAny(val, "\r\n") {
				cli.PrintWarning(os.Stderr, fmt.Sprintf("Skipping header with CRLF: %s", key))
				continue
			}
			c.CustomHeaders[key] = val
		}
	}
	if *f.Data != "" {
		c.PostData = *f.Data
	}
	if *f.PostFile != "" {
		c.PostFile = *f.PostFile
	}
	if *f.Range != "" {
		c.Range = *f.Range
	}
	if *f.Compressed {
		c.Compressed = true
	}
	if *f.Referer != "" {
		c.Referer = *f.Referer
	}
	if *f.Fail {
		c.FailOnHTTPError = true
	}
	if *f.NoClobber {
		c.Transport.NoClobber = true
	}
	if len(f.Form) > 0 {
		c.FormData = f.Form
	}

	// ── Recursive flags ──
	if *f.RecursiveParallel > 0 {
		c.Recursive.Parallel = *f.RecursiveParallel
	}
	if *f.Wait != "" {
		if d, err := time.ParseDuration(*f.Wait); err == nil {
			c.Recursive.Wait = d
		}
	}
	if *f.RandomWait {
		c.Recursive.RandomWait = true
	}
	if *f.ConvertLinks {
		c.Recursive.ConvertLinks = true
	}
	if *f.Accept != "" {
		c.Recursive.Accept = *f.Accept
	}
	if *f.Domains != "" {
		c.Recursive.Domains = strings.Split(*f.Domains, ",")
	}
	if *f.Reject != "" {
		c.Recursive.Reject = strings.Split(*f.Reject, ",")
	}
	if *f.CutDirs > 0 {
		c.Recursive.CutDirs = *f.CutDirs
	}
	if *f.PageRequisites {
		c.Recursive.PageRequisites = true
	}
	if *f.SpanHosts {
		c.Recursive.SpanHosts = true
	}
	if *f.AdjustExt {
		c.Recursive.AdjustExt = true
	}
	if *f.BackupConverted {
		c.Recursive.BackupConverted = true
	}

	// ── Cookies from CLI flags ──
	if len(f.Cookies) > 0 {
		if cookieJar == nil {
			var err error
			cookieJar, err = cookie.NewJar()
			if err != nil {
				cli.PrintWarning(os.Stderr, fmt.Sprintf("failed to create cookie jar: %v", err))
			}
		}
		if cookieJar != nil {
			for _, cstr := range f.Cookies {
				parts := strings.SplitN(cstr, "=", 2)
				if len(parts) < 2 {
					cli.PrintWarning(os.Stderr, fmt.Sprintf("invalid cookie format (use name=value): %s", cstr))
					continue
				}
				ck := &stdhttp.Cookie{Name: parts[0], Value: parts[1]}
				cookieJar.SetCookies(parsedURL, []*stdhttp.Cookie{ck})
			}
			c.CookieJar = cookieJar
		}
	}
}