package bonfire

import (
	"context"
	"errors"
	"strings"

	tea "charm.land/bubbletea/v2"
)

// consoleState is the optional side of an Output that knows the running
// command's global options. The bonfire console implements it; other
// Output implementations give the zero values.
type consoleState interface {
	consoleGlobals() Globals
	consoleInteractive() bool
	consoleTerminal() bool
}

func (c *console) consoleGlobals() Globals { return c.globals }

func (c *console) consoleInteractive() bool { return c.canPrompt() }

func (c *console) consoleTerminal() bool { return c.tty }

// GlobalsOf returns the global options of the command out belongs to, or
// the zero Globals when out is not a bonfire console.
func GlobalsOf(out Output) Globals {
	if s, ok := out.(consoleState); ok {
		return s.consoleGlobals()
	}
	return Globals{}
}

// VerbosityOf returns the -v level (0 to 3) of the command out belongs to.
func VerbosityOf(out Output) int {
	return GlobalsOf(out).Verbosity
}

// IsQuiet reports whether the command runs with -q.
func IsQuiet(out Output) bool {
	return GlobalsOf(out).Quiet
}

// Interactive reports whether out can ask a person: stdin and stdout are
// terminals and neither -n nor -q is set. It is false for other Output
// implementations and inside bonfire.Call.
func Interactive(out Output) bool {
	if s, ok := out.(consoleState); ok {
		return s.consoleInteractive()
	}
	return false
}

// IsTerminal reports whether out writes to a terminal (its stdout is one).
// It is false for other Output implementations and inside bonfire.Call.
// Long-running commands use it to choose between a styled summary block for
// a person and log records for journald.
func IsTerminal(out Output) bool {
	if s, ok := out.(consoleState); ok {
		return s.consoleTerminal()
	}
	return false
}

// Detail is one line of a Details block: a label and its value. Warn
// prints the value in the warning color.
type Detail struct {
	Label string
	Value string
	Warn  bool
}

// Details prints title (when not empty) and rows as aligned label/value
// lines in the console palette: muted labels padded to the longest one,
// values in the default color or, with Warn, in the warning color. It
// prints nothing under -q. serve, queue:work and summer dev use it for
// their startup summaries and shutdown reports.
func Details(out Output, title string, rows []Detail) {
	if IsQuiet(out) {
		return
	}
	width := 0
	for _, r := range rows {
		width = max(width, len([]rune(r.Label)))
	}
	c, styled := out.(*console)
	var b strings.Builder
	if title != "" {
		if styled {
			b.WriteString(c.palette.Header.Render(title))
		} else {
			b.WriteString(title)
		}
		b.WriteByte('\n')
	}
	for _, r := range rows {
		label := r.Label + strings.Repeat(" ", width-len([]rune(r.Label)))
		value := r.Value
		if styled {
			label = c.palette.Muted.Render(label)
			if r.Warn {
				value = c.palette.Warning.Render(value)
			}
		}
		b.WriteString("  " + label + "  " + value + "\n")
	}
	if styled {
		c.emit(c.out, b.String())
		return
	}
	out.Printf("%s", b.String())
}

// ConfirmProceed asks question before a destructive step, defaulting to
// no, only when out is Interactive. Off a terminal, with -n or -q and in
// bonfire.Call it returns true without asking, so deploys over SSH and
// scheduled runs never block (D-28).
func ConfirmProceed(out Output, question string) (bool, error) {
	if !Interactive(out) {
		return true, nil
	}
	return out.Confirm(question, false)
}

// Current tells p which item is being worked on, when p is an ItemProgress.
func Current(p Progress, item string) {
	if ip, ok := p.(ItemProgress); ok {
		ip.Current(item)
	}
}

// Failed records a failed item on p, when p is an ItemProgress.
func Failed(p Progress, item string, err error) {
	if ip, ok := p.(ItemProgress); ok {
		ip.Fail(item, err)
	}
}

// Process runs fn for each item in turn. On a live console it shows SSU's
// process view: one row per item (waiting, running, done or failed with its
// error) and a progress bar labelled operation. Otherwise it prints one line
// per item, "✓ item" through Output.Success or "✗ item: error" through
// Output.Error, so -q prints only the failures. It stops early when ctx is
// cancelled and returns errors.Join of the failures.
func Process(ctx context.Context, out Output, operation string, items []string, fn func(ctx context.Context, item string) error) error {
	if ctx == nil {
		ctx = context.Background()
	}
	if c, ok := out.(*console); ok && c.live() && len(items) > 0 {
		var errs []error
		_ = runLive(ctx, c.out, c, newProcessModel(c.palette, operation, items), func(send func(tea.Msg)) error {
			for i, item := range items {
				if err := ctx.Err(); err != nil {
					errs = append(errs, err)
					return nil
				}
				send(stepMsg{item: item, state: itemRunning, done: i})
				if err := fn(ctx, item); err != nil {
					errs = append(errs, failure(item, err))
					send(stepMsg{item: item, state: itemFailed, err: err, done: i + 1})
					continue
				}
				send(stepMsg{item: item, state: itemDone, done: i + 1})
			}
			return nil
		})
		return errors.Join(errs...)
	}
	var errs []error
	for _, item := range items {
		if err := ctx.Err(); err != nil {
			errs = append(errs, err)
			break
		}
		if err := fn(ctx, item); err != nil {
			errs = append(errs, failure(item, err))
			out.Error(failureLine(item, err))
			continue
		}
		out.Success(item)
	}
	return errors.Join(errs...)
}

// failure wraps err with the item it belongs to.
func failure(item string, err error) error {
	return &itemError{item: item, err: err}
}

type itemError struct {
	item string
	err  error
}

func (e *itemError) Error() string { return failureLine(e.item, e.err) }

func (e *itemError) Unwrap() error { return e.err }

// PrintAbove prints line above the running live view (spinner, progress or
// process view) and reports whether one was running. diary's console
// channel uses it so log lines from other goroutines never tear a view; it
// writes directly when PrintAbove returns false.
func PrintAbove(line string) bool {
	return printAboveLines(line)
}