// Package tools wires the 9 harborforge_* tool implementations to
// the plugin's runtime state (config, telemetry collector, monitor
// bridge, calendar scheduler). Each tool is a CallTool dispatch
// branch in main.go's plugin; this package holds the shared logic.

package tools

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"strings"
	"time"

	sdkplugin "git.hangman-lab.top/hzhang/Plexum-sdk-go/plugin"

	"git.hangman-lab.top/zhi/HarborForge.PlexumPlugin/internal/calendar"
	"git.hangman-lab.top/zhi/HarborForge.PlexumPlugin/internal/config"
	"git.hangman-lab.top/zhi/HarborForge.PlexumPlugin/internal/monitor"
	"git.hangman-lab.top/zhi/HarborForge.PlexumPlugin/internal/telemetry"
)

// Deps is the bundle main.go passes when constructing the tool router.
type Deps struct {
	Config    config.Resolved
	Version   string
	Collect   func() telemetry.Snapshot
	Bridge    *monitor.Bridge
	Scheduler *calendar.Scheduler
	Host      sdkplugin.HostAPI

	// AgentIDFromCtx returns the agent id the call belongs to. Plexum
	// host injects this via the tool dispatch context; main.go's
	// CallTool reads it from the ctx and stashes here.
	AgentIDFromCtx func(ctx context.Context) string
}

// Dispatch is the entry point main.go's ToolPlugin.CallTool calls.
// Returns the canonical text response. Errors come through as
// is_error=true ToolResult rather than RPC errors so the model sees
// human-readable detail.
func Dispatch(ctx context.Context, deps Deps, name string, input json.RawMessage) (sdkplugin.ToolResult, error) {
	switch name {
	case "harborforge_status":
		return toolStatus(deps)
	case "harborforge_telemetry":
		return toolTelemetry(deps)
	case "harborforge_monitor_telemetry":
		return toolMonitorTelemetry(deps)
	case "harborforge_calendar_status":
		return toolCalendarStatus(deps)
	case "harborforge_calendar_complete":
		return toolCalendarComplete(ctx, deps, input)
	case "harborforge_calendar_abort":
		return toolCalendarAbort(ctx, deps, input)
	case "harborforge_calendar_pause":
		return toolCalendarPause(ctx, deps, input)
	case "harborforge_calendar_resume":
		return toolCalendarResume(ctx, deps)
	case "harborforge_restart_status":
		return toolRestartStatus(deps)
	}
	return sdkplugin.ToolResult{
		IsError: true,
		Content: []sdkplugin.ContentBlock{{Type: "text", Text: "unknown tool: " + name}},
	}, nil
}

func toolStatus(deps Deps) (sdkplugin.ToolResult, error) {
	bs := deps.Bridge.Stats()
	sch := deps.Scheduler.Status()
	out := map[string]any{
		"plugin": map[string]any{
			"name":    "harbor-forge",
			"version": deps.Version,
			"backend": "plexum",
		},
		"config": map[string]any{
			"backend_url":         deps.Config.BackendURL,
			"identifier":          deps.Config.Identifier,
			"monitor_port":        deps.Config.MonitorPort,
			"calendar_enabled":    deps.Config.CalendarEnabled,
			"calendar_backendurl": deps.Config.CalendarBackendURL,
		},
		"monitor_bridge": map[string]any{
			"listening":  bs.Listening,
			"port":       bs.Port,
			"queries":    bs.Queries,
			"last_query": bs.LastQuery,
		},
		"calendar": sch,
	}
	return jsonResult(out)
}

func toolTelemetry(deps Deps) (sdkplugin.ToolResult, error) {
	return jsonResult(deps.Collect())
}

func toolMonitorTelemetry(deps Deps) (sdkplugin.ToolResult, error) {
	bs := deps.Bridge.Stats()
	return jsonResult(map[string]any{
		"port":       bs.Port,
		"listening":  bs.Listening,
		"queries":    bs.Queries,
		"last_query": bs.LastQuery,
		"last_snapshot": bs.LastSnap,
	})
}

func toolCalendarStatus(deps Deps) (sdkplugin.ToolResult, error) {
	return jsonResult(deps.Scheduler.Status())
}

func toolCalendarComplete(ctx context.Context, deps Deps, input json.RawMessage) (sdkplugin.ToolResult, error) {
	var args struct{ Summary string `json:"summary"` }
	_ = json.Unmarshal(input, &args)
	agentID := deps.AgentIDFromCtx(ctx)
	if agentID == "" {
		return errResult("calendar_complete: no agent context")
	}
	if err := deps.Scheduler.CompleteForAgent(ctx, agentID, args.Summary); err != nil {
		if errors.Is(err, calendar.ErrNoActiveSlot) {
			return errResult("no active slot for agent " + agentID)
		}
		return errResult("complete failed: " + err.Error())
	}
	return okResult("slot marked completed")
}

func toolCalendarAbort(ctx context.Context, deps Deps, input json.RawMessage) (sdkplugin.ToolResult, error) {
	var args struct{ Reason string `json:"reason"` }
	_ = json.Unmarshal(input, &args)
	agentID := deps.AgentIDFromCtx(ctx)
	if agentID == "" {
		return errResult("calendar_abort: no agent context")
	}
	if err := deps.Scheduler.AbortForAgent(ctx, agentID, args.Reason); err != nil {
		if errors.Is(err, calendar.ErrNoActiveSlot) {
			return errResult("no active slot for agent " + agentID)
		}
		return errResult("abort failed: " + err.Error())
	}
	return okResult("slot aborted")
}

func toolCalendarPause(ctx context.Context, deps Deps, input json.RawMessage) (sdkplugin.ToolResult, error) {
	var args struct{ Reason string `json:"reason"` }
	_ = json.Unmarshal(input, &args)
	agentID := deps.AgentIDFromCtx(ctx)
	if agentID == "" {
		return errResult("calendar_pause: no agent context")
	}
	if err := deps.Scheduler.PauseForAgent(ctx, agentID, args.Reason); err != nil {
		if errors.Is(err, calendar.ErrNoActiveSlot) {
			return errResult("no active slot for agent " + agentID)
		}
		return errResult("pause failed: " + err.Error())
	}
	return okResult("slot paused")
}

func toolCalendarResume(ctx context.Context, deps Deps) (sdkplugin.ToolResult, error) {
	agentID := deps.AgentIDFromCtx(ctx)
	if agentID == "" {
		return errResult("calendar_resume: no agent context")
	}
	if err := deps.Scheduler.ResumeForAgent(ctx, agentID); err != nil {
		if errors.Is(err, calendar.ErrNoActiveSlot) {
			return errResult("no active slot for agent " + agentID)
		}
		return errResult("resume failed: " + err.Error())
	}
	return okResult("slot resumed")
}

func toolRestartStatus(deps Deps) (sdkplugin.ToolResult, error) {
	sch := deps.Scheduler.Status()
	return jsonResult(map[string]any{
		"pending":        sch.RestartPending,
		"last_heartbeat": sch.LastHeartbeat,
		"observed_at":    time.Now().UTC(),
	})
}

// ---- result helpers ----

func jsonResult(v any) (sdkplugin.ToolResult, error) {
	raw, err := json.MarshalIndent(v, "", "  ")
	if err != nil {
		return sdkplugin.ToolResult{}, fmt.Errorf("encode tool result: %w", err)
	}
	return sdkplugin.ToolResult{
		Content: []sdkplugin.ContentBlock{{Type: "text", Text: string(raw)}},
	}, nil
}

func okResult(text string) (sdkplugin.ToolResult, error) {
	return sdkplugin.ToolResult{
		Content: []sdkplugin.ContentBlock{{Type: "text", Text: text}},
	}, nil
}

func errResult(text string) (sdkplugin.ToolResult, error) {
	if !strings.HasPrefix(text, "harborforge_") {
		text = "harborforge: " + text
	}
	return sdkplugin.ToolResult{
		IsError: true,
		Content: []sdkplugin.ContentBlock{{Type: "text", Text: text}},
	}, nil
}