// Package commands — agent runtime-status command (`hf agent status`).
//
// Wraps the plugin-facing `POST /calendar/agent/status` endpoint so agents
// driven from `pcexec` (which sets AGENT_ID/CLAW_IDENTIFIER env) can report
// their status from a workflow without writing curl in the middle of a
// `flow.md` procedure.
//
// The endpoint itself is unauthenticated at the HTTP layer — it identifies
// the agent purely from X-Agent-ID + X-Claw-Identifier headers — so this
// command does NOT call `ResolveToken`. Calling it from outside a pcexec
// session will fail because AGENT_ID/CLAW_IDENTIFIER won't be set.
package commands

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"strings"
	"time"

	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/config"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/output"
)

// RunAgentStatus implements `hf agent status --set <status>`.
//
// Supported statuses (mirrors backend `AgentStatus` enum):
//   idle | busy | on_call | exhausted | offline
//
// For `exhausted`, an optional `--reason <rate_limit|billing>` and
// `--recovery-at <ISO-8601>` can be provided.
func RunAgentStatus(args []string) {
	target := ""
	reason := ""
	recoveryAt := ""

	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--set":
			if i+1 >= len(args) {
				output.Error("usage: hf agent status --set <idle|busy|on_call|exhausted|offline> [--reason <rate_limit|billing>] [--recovery-at <iso>]")
			}
			target = args[i+1]
			i++
		case "--reason":
			if i+1 >= len(args) {
				output.Error("--reason requires a value")
			}
			reason = args[i+1]
			i++
		case "--recovery-at":
			if i+1 >= len(args) {
				output.Error("--recovery-at requires an ISO-8601 timestamp")
			}
			recoveryAt = args[i+1]
			i++
		default:
			output.Errorf("unknown flag: %s", args[i])
		}
	}

	if target == "" {
		output.Error("--set <status> is required")
	}

	agentID := strings.TrimSpace(os.Getenv("AGENT_ID"))
	clawID := strings.TrimSpace(os.Getenv("CLAW_IDENTIFIER"))
	if clawID == "" {
		// Match the plugin convention: hostname fallback when CLAW_IDENTIFIER
		// is unset. Most pcexec callers won't have it set in env.
		if h, err := os.Hostname(); err == nil {
			clawID = h
		}
	}
	if agentID == "" {
		output.Error("AGENT_ID env is not set — run via pcexec or export AGENT_ID first")
	}
	if clawID == "" {
		output.Error("CLAW_IDENTIFIER env not set and hostname() failed — set CLAW_IDENTIFIER explicitly")
	}

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}

	body := map[string]interface{}{
		"agent_id":         agentID,
		"claw_identifier":  clawID,
		"status":           target,
	}
	if reason != "" {
		body["exhaust_reason"] = reason
	}
	if recoveryAt != "" {
		body["recovery_at"] = recoveryAt
	}

	payload, err := json.Marshal(body)
	if err != nil {
		output.Errorf("cannot marshal payload: %v", err)
	}

	url := strings.TrimRight(cfg.BaseURL, "/") + "/calendar/agent/status"
	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(payload))
	if err != nil {
		output.Errorf("cannot build request: %v", err)
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Agent-ID", agentID)
	req.Header.Set("X-Claw-Identifier", clawID)

	client := &http.Client{Timeout: 30 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		output.Errorf("request failed: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode/100 != 2 {
		buf := new(bytes.Buffer)
		_, _ = buf.ReadFrom(resp.Body)
		output.Errorf("backend returned %d: %s", resp.StatusCode, buf.String())
	}

	if output.JSONMode {
		buf := new(bytes.Buffer)
		_, _ = buf.ReadFrom(resp.Body)
		fmt.Println(buf.String())
		return
	}
	output.PrintKeyValue(
		"agent_id", agentID,
		"claw_identifier", clawID,
		"status", target,
		"ok", "true",
	)
}