package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"time"

	"gitea.lab.audasmedia.com.au/sam/compass_teams_nhs/internal/config"
	"gitea.lab.audasmedia.com.au/sam/compass_teams_nhs/internal/dashboard"
	"gitea.lab.audasmedia.com.au/sam/compass_teams_nhs/internal/store"
)

// briefCommand is the `school brief` entry point. Phase 5 builds and deletes the
// stored brief (the summary half of FR-10); sending it is Phase 7.
func briefCommand(args []string) {
	if len(args) == 0 {
		usage("school brief build --child NAME | school brief list")
	}
	switch args[0] {
	case "build":
		briefBuild(args[1:])
	case "list":
		briefList()
	default:
		usage("school brief build --child NAME | school brief list")
	}
}

func briefBuild(args []string) {
	fs := flag.NewFlagSet("brief build", flag.ContinueOnError)
	var child string
	fs.StringVar(&child, "child", "", "child name (Harry or Finn)")
	_ = fs.Parse(args)
	if child == "" {
		fmt.Fprintln(os.Stderr, "school brief build: --child is required")
		os.Exit(2)
	}
	if err := runBriefBuild(child); err != nil {
		fmt.Fprintln(os.Stderr, "school brief:", err)
		os.Exit(1)
	}
}

func runBriefBuild(child string) error {
	ctx := context.Background()
	cfg, err := config.LoadDB()
	if err != nil {
		return err
	}
	st, err := store.Open(cfg.DBPath)
	if err != nil {
		return err
	}
	defer st.Close()
	if err := st.Migrate(ctx); err != nil {
		return err
	}
	c, err := st.ChildByName(ctx, child)
	if err != nil {
		return err
	}
	if c == nil {
		return fmt.Errorf("unknown child %q", child)
	}
	items, err := st.ItemsForChild(ctx, c.ID)
	if err != nil {
		return err
	}
	text := dashboard.Render(c.Name, dashboard.Classify(items, time.Now(), cfg.Location), cfg.Location)
	id, err := st.CreateSummary(ctx, c.Name, text)
	if err != nil {
		return err
	}
	fmt.Printf("brief=%d recipient=%s bytes=%d\n", id, c.Name, len(text))
	return nil
}

func briefList() {
	ctx := context.Background()
	cfg, err := config.LoadDB()
	if err != nil {
		fmt.Fprintln(os.Stderr, "school brief:", err)
		os.Exit(1)
	}
	st, err := store.Open(cfg.DBPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "school brief:", err)
		os.Exit(1)
	}
	defer st.Close()
	summaries, err := st.ListSummaries(ctx, 20)
	if err != nil {
		fmt.Fprintln(os.Stderr, "school brief:", err)
		os.Exit(1)
	}
	if len(summaries) == 0 {
		fmt.Println("no briefs stored")
		return
	}
	for _, sm := range summaries {
		status := "draft"
		if sm.SentAt != nil {
			status = "sent " + sm.SentAt.Format("2006-01-02 15:04")
		}
		fmt.Printf("%d\t%s\t%s\t%s\n", sm.ID, sm.Recipient, status, firstLine(sm.Text))
	}
}

func firstLine(s string) string {
	for i, r := range s {
		if r == '\n' {
			return s[:i]
		}
	}
	return s
}

func usage(msg string) {
	fmt.Fprintln(os.Stderr, "usage:", msg)
	os.Exit(2)
}