package wing_test

import (
	"context"
	"regexp"
	"testing"

	"github.com/stretchr/testify/assert"

	"github.com/mathiasbq/hyperguild/ingestion/internal/wing"
)

func routerBrain(t *testing.T) string {
	dir := t.TempDir()
	writePage(t, dir, "wiki/homelab/facts/a.md", "x")
	writePage(t, dir, "wiki/rikatillsammans/facts/b.md", "x")
	return dir
}

func TestRouter_Decisions(t *testing.T) {
	tests := []struct {
		name     string
		note     wing.Note
		want     wing.Source
		wantWing string
	}{
		{"no signal goes to the default wing", wing.Note{Text: "a talk about agents"}, wing.Default, "web-clip"},
		{"a subfolder naming an existing wing places there", wing.Note{Dir: "homelab", Text: "x"}, wing.Explicit, "homelab"},
		{"a deliberate subfolder into a client wing is the owner's call and is placed", wing.Note{Dir: "rikatillsammans", Text: "x"}, wing.Explicit, "rikatillsammans"},
		{"frontmatter wing places like a subfolder", wing.Note{FrontmatterWing: "homelab", Text: "x"}, wing.Explicit, "homelab"},
		{"subfolder is case-insensitive", wing.Note{Dir: "HomeLab", Text: "x"}, wing.Explicit, "homelab"},
		{"a typo never creates a wing", wing.Note{Dir: "hoemlab", Text: "x"}, wing.Exception, "hoemlab"},
		{"conflicting signals are parked", wing.Note{Dir: "homelab", FrontmatterWing: "rikatillsammans", Text: "x"}, wing.Exception, ""},
		{"the default wing may be named explicitly even before it exists", wing.Note{Dir: "web-clip", Text: "x"}, wing.Explicit, "web-clip"},
		{"client marker with no signal is parked, not defaulted", wing.Note{Text: "notes from the ACME-CLIENT kickoff"}, wing.Exception, ""},
		{"client marker does not block a deliberate subfolder", wing.Note{Dir: "homelab", Text: "ACME-CLIENT"}, wing.Explicit, "homelab"},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			r := wing.Router{BrainDir: routerBrain(t), Default: "web-clip", ClientBlock: regexp.MustCompile(`(?i)acme-client`)}
			d := r.Resolve(context.Background(), tt.note)
			assert.Equal(t, tt.want, d.Source)
			assert.Equal(t, tt.wantWing, d.Wing)
			assert.NotEmpty(t, d.Reason)
		})
	}
}

func TestRouter_ReadsTheWingsFreshOnEveryDecision(t *testing.T) {
	dir := routerBrain(t)
	r := wing.Router{BrainDir: dir, Default: "web-clip"}
	assert.Equal(t, wing.Exception, r.Resolve(context.Background(), wing.Note{Dir: "newwing", Text: "x"}).Source)

	writePage(t, dir, "wiki/newwing/facts/c.md", "x") // a wing created after startup
	assert.Equal(t, wing.Explicit, r.Resolve(context.Background(), wing.Note{Dir: "newwing", Text: "x"}).Source,
		"a wing made while the server runs is usable without a restart")
}

func TestRouter_AnUnreadableBrainParksInsteadOfGuessing(t *testing.T) {
	r := wing.Router{BrainDir: t.TempDir() + "/missing", Default: "web-clip"}
	d := r.Resolve(context.Background(), wing.Note{Dir: "homelab", Text: "x"})
	assert.Equal(t, wing.Exception, d.Source)
}

func TestRouter_WithoutADefaultAnUnsignalledNoteIsParked(t *testing.T) {
	r := wing.Router{BrainDir: routerBrain(t)}
	assert.Equal(t, wing.Exception, r.Resolve(context.Background(), wing.Note{Text: "x"}).Source)
}

func TestRouter_ADefaultThatIsNotAPlainNameIsRefused(t *testing.T) {
	r := wing.Router{BrainDir: routerBrain(t), Default: "../escape"}
	assert.Equal(t, wing.Exception, r.Resolve(context.Background(), wing.Note{Text: "x"}).Source)
}

func TestRouter_ANameThatIsNotPlainIsRefusedAsSuch(t *testing.T) {
	for _, bad := range []string{"../x", "a/b", "has space", "dot.ted"} {
		t.Run(bad, func(t *testing.T) {
			// Default equals the bad name: the "named explicitly" shortcut for the
			// default wing must not wave a malformed name through.
			r := wing.Router{BrainDir: routerBrain(t), Default: bad}
			d := r.Resolve(context.Background(), wing.Note{Dir: bad, Text: "x"})
			assert.Equal(t, wing.Exception, d.Source)
			assert.Empty(t, d.Wing, "a malformed name is never echoed as a proposal")
			assert.Contains(t, d.Reason, "not a plain wing name")
		})
	}
}