package harness

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"reflect"
	"strings"

	. "github.com/ipfs/kubo/test/cli/testutils"
)

func (n *Node) IPFSCommands() []string {
	res := n.IPFS("commands").Stdout.String()
	res = strings.TrimSpace(res)
	split := SplitLines(res)
	var cmds []string
	for _, line := range split {
		trimmed := strings.TrimSpace(line)
		if trimmed == "ipfs" {
			continue
		}
		cmds = append(cmds, trimmed)
	}
	return cmds
}

func (n *Node) SetIPFSConfig(key string, val any, flags ...string) {
	valBytes, err := json.Marshal(val)
	if err != nil {
		log.Panicf("marshling config for key '%s': %s", key, err)
	}
	valStr := string(valBytes)

	args := []string{"config", "--json"}
	args = append(args, flags...)
	args = append(args, key, valStr)
	n.IPFS(args...)

	// validate the config was set correctly

	// Create a new value which is a pointer to the same type as the source.
	var newVal any
	if val != nil {
		// If it is not nil grab the type with reflect.
		newVal = reflect.New(reflect.TypeOf(val)).Interface()
	} else {
		// else just set a pointer to an any.
		var anything any
		newVal = &anything
	}
	n.GetIPFSConfig(key, newVal)
	// dereference newVal using reflect to load the resulting value
	if !reflect.DeepEqual(val, reflect.ValueOf(newVal).Elem().Interface()) {
		log.Panicf("key '%s' did not retain value '%s' after it was set, got '%s'", key, val, newVal)
	}
}

func (n *Node) GetIPFSConfig(key string, val any) {
	res := n.IPFS("config", key)
	valStr := strings.TrimSpace(res.Stdout.String())
	// only when the result is a string is the result not well-formed JSON,
	// so check the value type and add quotes if it's expected to be a string
	reflectVal := reflect.ValueOf(val)
	if reflectVal.Kind() == reflect.Pointer && reflectVal.Elem().Kind() == reflect.String {
		valStr = fmt.Sprintf(`"%s"`, valStr)
	}
	err := json.Unmarshal([]byte(valStr), val)
	if err != nil {
		log.Fatalf("unmarshaling config for key '%s', value '%s': %s", key, valStr, err)
	}
}

func (n *Node) IPFSAddStr(content string, args ...string) string {
	log.Debugf("node %d adding content '%s' with args: %v", n.ID, PreviewStr(content), args)
	return n.IPFSAdd(strings.NewReader(content), args...)
}

// IPFSAddDeterministic produces a CID of a file of a certain size, filled with deterministically generated bytes based on some seed.
// Size is specified as a humanize string (e.g., "256KiB", "1MiB").
// This ensures deterministic CID on the other end, that can be used in tests.
func (n *Node) IPFSAddDeterministic(size string, seed string, args ...string) string {
	log.Debugf("node %d adding %s of deterministic pseudo-random data with seed %q and args: %v", n.ID, size, seed, args)
	reader, err := DeterministicRandomReader(size, seed)
	if err != nil {
		panic(err)
	}
	return n.IPFSAdd(reader, args...)
}

// IPFSAddDeterministicBytes produces a CID of a file of exactly `size` bytes, filled with deterministically generated bytes based on some seed.
// Use this when exact byte precision is needed (e.g., threshold tests at T and T+1 bytes).
func (n *Node) IPFSAddDeterministicBytes(size int64, seed string, args ...string) string {
	log.Debugf("node %d adding %d bytes of deterministic pseudo-random data with seed %q and args: %v", n.ID, size, seed, args)
	reader, err := DeterministicRandomReaderBytes(size, seed)
	if err != nil {
		panic(err)
	}
	return n.IPFSAdd(reader, args...)
}

func (n *Node) IPFSAdd(content io.Reader, args ...string) string {
	log.Debugf("node %d adding with args: %v", n.ID, args)
	fullArgs := []string{"add", "-q"}
	fullArgs = append(fullArgs, args...)
	res := n.Runner.MustRun(RunRequest{
		Path:    n.IPFSBin,
		Args:    fullArgs,
		CmdOpts: []CmdOpt{RunWithStdin(content)},
	})
	out := strings.TrimSpace(res.Stdout.String())
	log.Debugf("add result: %q", out)
	return out
}

func (n *Node) IPFSBlockPut(content io.Reader, args ...string) string {
	log.Debugf("node %d block put with args: %v", n.ID, args)
	fullArgs := []string{"block", "put"}
	fullArgs = append(fullArgs, args...)
	res := n.Runner.MustRun(RunRequest{
		Path:    n.IPFSBin,
		Args:    fullArgs,
		CmdOpts: []CmdOpt{RunWithStdin(content)},
	})
	out := strings.TrimSpace(res.Stdout.String())
	log.Debugf("block put result: %q", out)
	return out
}

func (n *Node) IPFSDAGPut(content io.Reader, args ...string) string {
	log.Debugf("node %d dag put with args: %v", n.ID, args)
	fullArgs := []string{"dag", "put"}
	fullArgs = append(fullArgs, args...)
	res := n.Runner.MustRun(RunRequest{
		Path:    n.IPFSBin,
		Args:    fullArgs,
		CmdOpts: []CmdOpt{RunWithStdin(content)},
	})
	out := strings.TrimSpace(res.Stdout.String())
	log.Debugf("dag put result: %q", out)
	return out
}

func (n *Node) IPFSDagImport(content io.Reader, cid string, args ...string) error {
	log.Debugf("node %d dag import with args: %v", n.ID, args)
	fullArgs := []string{"dag", "import", "--pin-roots=false"}
	fullArgs = append(fullArgs, args...)
	res := n.Runner.MustRun(RunRequest{
		Path:    n.IPFSBin,
		Args:    fullArgs,
		CmdOpts: []CmdOpt{RunWithStdin(content)},
	})
	if res.Err != nil {
		return res.Err
	}
	res = n.Runner.MustRun(RunRequest{
		Path: n.IPFSBin,
		Args: []string{"block", "stat", "--offline", cid},
	})
	return res.Err
}

// IPFSDagExport exports a DAG rooted at cid to a CAR file at carPath.
func (n *Node) IPFSDagExport(cid string, carPath string) error {
	log.Debugf("node %d dag export of %s to %q", n.ID, cid, carPath)
	car, err := os.Create(carPath)
	if err != nil {
		return err
	}
	defer car.Close()

	res := n.Runner.MustRun(RunRequest{
		Path:    n.IPFSBin,
		Args:    []string{"dag", "export", cid},
		CmdOpts: []CmdOpt{RunWithStdout(car)},
	})
	return res.Err
}