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package cli

import (
	"fmt"
	"os"
	"time"

	"github.com/spf13/cobra"
	"golang.org/x/term"

	"github.com/humdrum-tiv/dots-cli/internal/day"
)

// timeNow is a seam so command tests can pin the clock.
var timeNow = func() time.Time { return time.Now() }

func stdinIsTTY() bool { return term.IsTerminal(int(os.Stdin.Fd())) }

func typeNames(types []day.ActivityType) map[string]string {
	m := make(map[string]string, len(types))
	for _, t := range types {
		m[t.ID] = t.Name
	}
	return m
}

// pickActivity resolves a query to exactly one type or errors.
func pickActivity(query string, types []day.ActivityType) (*day.ActivityType, error) {
	matches := day.MatchActivity(query, types)
	switch len(matches) {
	case 1:
		return &matches[0], nil
	case 0:
		names := make([]string, len(types))
		for i, t := range types {
			names[i] = t.Name
		}
		return nil, fmt.Errorf("no activity matches %q — have: %v", query, names)
	default:
		if !stdinIsTTY() {
			return nil, fmt.Errorf("%q is ambiguous: %v", query, namesOf(matches))
		}
		fmt.Println("Which one?")
		for i, m := range matches {
			fmt.Printf("  %d) %s\n", i+1, m.Name)
		}
		fmt.Print("> ")
		var n int
		if _, err := fmt.Scanln(&n); err != nil || n < 1 || n > len(matches) {
			return nil, fmt.Errorf("no selection")
		}
		return &matches[n-1], nil
	}
}

func namesOf(ts []day.ActivityType) []string {
	out := make([]string, len(ts))
	for i, t := range ts {
		out[i] = t.Name
	}
	return out
}

func NewLogCmd() *cobra.Command {
	var date string
	var yes bool
	cmd := &cobra.Command{
		Use:   "log [time|range] [activity]",
		Short: "Paint logged block(s); no activity = fill from plan",
		Args:  cobra.MaximumNArgs(2),
		RunE: func(cmd *cobra.Command, args []string) error {
			client, err := RequireClient()
			if err != nil {
				return err
			}
			// Positional parsing: first arg is a time only if it looks like one.
			target, activityQuery := "", ""
			switch len(args) {
			case 1:
				if day.IsTimeSyntax(args[0]) {
					target = args[0]
				} else {
					activityQuery = args[0]
				}
			case 2:
				if !day.IsTimeSyntax(args[0]) {
					return fmt.Errorf("first argument %q is not a time — usage: dots log [time|range] [activity]", args[0])
				}
				target, activityQuery = args[0], args[1]
			}

			if date == "" {
				date = Today()
			}
			d, err := client.GetDay(date, TZ())
			if err != nil {
				return err
			}
			targets, err := day.ParseTarget(target, d.BlockSize, timeNow())
			if err != nil {
				return err
			}

			var activityID *string
			if activityQuery != "" {
				t, err := pickActivity(activityQuery, d.Types)
				if err != nil {
					return err
				}
				activityID = &t.ID
			}

			assignments, overwrites, err := day.ResolveLog(targets, activityID, d.Blocks, d.PlanBlocks, d.BlockSize)
			if err != nil {
				return err
			}
			if len(overwrites) > 0 {
				fmt.Print(FormatChanges(overwrites, typeNames(d.Types), d.BlockSize))
				ok, err := Confirm("Overwrite?", yes, os.Stdin, os.Stdout, stdinIsTTY())
				if err != nil {
					return err
				}
				if !ok {
					fmt.Println("Aborted, nothing written.")
					return nil
				}
			}
			if err := client.WriteBlocks(date, assignments); err != nil {
				return err
			}
			fmt.Printf("Logged %d block(s).\n", len(assignments))
			return nil
		},
	}
	cmd.Flags().StringVar(&date, "date", "", "day to write (YYYY-MM-DD, default today)")
	cmd.Flags().BoolVarP(&yes, "yes", "y", false, "skip confirmation prompts")
	return cmd
}

func NewClearCmd() *cobra.Command {
	var date string
	var yes bool
	cmd := &cobra.Command{
		Use:   "clear <time|range>",
		Short: "Clear logged block(s)",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			client, err := RequireClient()
			if err != nil {
				return err
			}
			if !day.IsTimeSyntax(args[0]) {
				return fmt.Errorf("%q is not a time or range", args[0])
			}
			if date == "" {
				date = Today()
			}
			d, err := client.GetDay(date, TZ())
			if err != nil {
				return err
			}
			targets, err := day.ParseTarget(args[0], d.BlockSize, timeNow())
			if err != nil {
				return err
			}
			assignments, cleared := day.ResolveClear(targets, d.Blocks)
			if len(cleared) == 0 {
				fmt.Println("Nothing logged there.")
				return nil
			}
			fmt.Print(FormatChanges(cleared, typeNames(d.Types), d.BlockSize))
			ok, err := Confirm("Clear?", yes, os.Stdin, os.Stdout, stdinIsTTY())
			if err != nil {
				return err
			}
			if !ok {
				fmt.Println("Aborted, nothing cleared.")
				return nil
			}
			if err := client.WriteBlocks(date, assignments); err != nil {
				return err
			}
			fmt.Printf("Cleared %d block(s).\n", len(cleared))
			return nil
		},
	}
	cmd.Flags().StringVar(&date, "date", "", "day to write (YYYY-MM-DD, default today)")
	cmd.Flags().BoolVarP(&yes, "yes", "y", false, "skip confirmation prompts")
	return cmd
}