package cluster

import (
	"context"
	"errors"
	"log"
	"regexp"
	"sync"
	"time"

	"scm.bstein.dev/bstein/ananke/internal/config"
	"scm.bstein.dev/bstein/ananke/internal/execx"
	"scm.bstein.dev/bstein/ananke/internal/state"
)

type Orchestrator struct {
	cfg                  config.Config
	runner               *execx.Runner
	store                *state.Store
	log                  *log.Logger
	runOverride          func(timeoutCtx context.Context, timeout time.Duration, name string, args ...string) (string, error)
	runSensitiveOverride func(timeoutCtx context.Context, timeout time.Duration, name string, args ...string) (string, error)
	startupReportMu      sync.Mutex
	activeStartupReport  *startupReport
}

type commandOverrideFunc func(timeoutCtx context.Context, timeout time.Duration, name string, args ...string) (string, error)

type StartupOptions struct {
	ForceFluxBranch    string
	SkipLocalBootstrap bool
	Reason             string
}

type ShutdownOptions struct {
	SkipEtcdSnapshot bool
	SkipDrain        bool
	Mode             string
	Reason           string
}

type EtcdRestoreOptions struct {
	ControlPlane string
	SnapshotPath string
}

type startupWorkload struct {
	Namespace string
	Kind      string
	Name      string
}

type workloadScaleEntry struct {
	Namespace string `json:"namespace"`
	Kind      string `json:"kind"`
	Name      string `json:"name"`
	Replicas  int    `json:"replicas"`
}

type remotePeerStatus struct {
	Intent          state.Intent
	BootstrapActive bool
}

type workloadScaleSnapshot struct {
	GeneratedAt time.Time            `json:"generated_at"`
	Entries     []workloadScaleEntry `json:"entries"`
}

type startupReport struct {
	StartedAt   time.Time                     `json:"started_at"`
	Completed   time.Time                     `json:"completed_at"`
	Reason      string                        `json:"reason"`
	Status      string                        `json:"status"`
	Phase       string                        `json:"phase"`
	Success     bool                          `json:"success"`
	Error       string                        `json:"error,omitempty"`
	Checks      map[string]startupCheckRecord `json:"checks"`
	AutoHeals   []string                      `json:"auto_heals"`
	SourceHost  string                        `json:"source_host"`
	LastUpdated time.Time                     `json:"last_updated"`
}

type startupCheckRecord struct {
	Status    string    `json:"status"`
	Detail    string    `json:"detail"`
	UpdatedAt time.Time `json:"updated_at"`
}

var datastoreEndpointPattern = regexp.MustCompile(`--datastore-endpoint(?:=|\s+)(?:'([^']+)'|"([^"]+)"|([^\s\\]+))`)

var criticalStartupWorkloads = []startupWorkload{
	{Namespace: "flux-system", Kind: "deployment", Name: "source-controller"},
	{Namespace: "flux-system", Kind: "deployment", Name: "kustomize-controller"},
	{Namespace: "flux-system", Kind: "deployment", Name: "helm-controller"},
	{Namespace: "flux-system", Kind: "deployment", Name: "notification-controller"},
	{Namespace: "vault", Kind: "statefulset", Name: "vault"},
	{Namespace: "postgres", Kind: "statefulset", Name: "postgres"},
	{Namespace: "gitea", Kind: "deployment", Name: "gitea"},
	{Namespace: "monitoring", Kind: "deployment", Name: "grafana"},
	{Namespace: "monitoring", Kind: "statefulset", Name: "victoria-metrics-single-server"},
	{Namespace: "monitoring", Kind: "deployment", Name: "kube-state-metrics"},
	{Namespace: "logging", Kind: "deployment", Name: "oauth2-proxy-logs"},
	{Namespace: "logging", Kind: "deployment", Name: "opensearch-dashboards"},
	{Namespace: "logging", Kind: "statefulset", Name: "opensearch"},
}

var ErrEtcdRestoreNotApplicable = errors.New("etcd restore not applicable")

// New runs one orchestration or CLI step.
// Signature: New(cfg config.Config, runner *execx.Runner, store *state.Store, logger *log.Logger) *Orchestrator.
// Why: keeps behavior explicit so startup/shutdown workflows remain maintainable as services evolve.
func New(cfg config.Config, runner *execx.Runner, store *state.Store, logger *log.Logger) *Orchestrator {
	return &Orchestrator{cfg: cfg, runner: runner, store: store, log: logger}
}

// SetCommandOverrides runs one orchestration or CLI step.
// Signature: (o *Orchestrator) SetCommandOverrides(run commandOverrideFunc, runSensitive commandOverrideFunc).
// Why: enables deterministic integration testing from the top-level testing module
// without requiring package-local test files or live cluster dependencies.
func (o *Orchestrator) SetCommandOverrides(run commandOverrideFunc, runSensitive commandOverrideFunc) {
	o.runOverride = run
	o.runSensitiveOverride = runSensitive
}